From 6a1c34f4fd17ba647665fab1a8be6f22ae1f2ca8 Mon Sep 17 00:00:00 2001
From: Greg Ungerer <gerg@uclinux.org>
Date: Thu, 8 Jan 2015 14:19:49 +1000
Subject: serial: mcf: change email address to gerg@uclinux.org

Change my email contact address from the obsolete gerg@snapgear.com to
gerg@uclinux.org.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/mcf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/mcf.c b/drivers/tty/serial/mcf.c
index 10496672dfdb..1eb02bd74150 100644
--- a/drivers/tty/serial/mcf.c
+++ b/drivers/tty/serial/mcf.c
@@ -3,7 +3,7 @@
 /*
  *	mcf.c -- Freescale ColdFire UART driver
  *
- *	(C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
+ *	(C) Copyright 2003-2007, Greg Ungerer <gerg@uclinux.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -702,7 +702,7 @@ static void __exit mcf_exit(void)
 module_init(mcf_init);
 module_exit(mcf_exit);
 
-MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
+MODULE_AUTHOR("Greg Ungerer <gerg@uclinux.org>");
 MODULE_DESCRIPTION("Freescale ColdFire UART driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:mcfuart");
-- 
cgit v1.2.3-59-g8ed1b


From ebffbc6cdb8126f1034f5e0e6cd844efb1c3f03f Mon Sep 17 00:00:00 2001
From: Greg Ungerer <gerg@uclinux.org>
Date: Thu, 8 Jan 2015 14:19:50 +1000
Subject: serial: mcf: fix compile warnings
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Trivially fix the following compile time warnings:

  CC      drivers/tty/serial/mcf.o
drivers/tty/serial/mcf.c: In function ‘mcf_set_termios’:
drivers/tty/serial/mcf.c:201:19: warning: unused variable ‘pp’
drivers/tty/serial/mcf.c: In function ‘mcf_config_rs485’:
drivers/tty/serial/mcf.c:444:19: warning: unused variable ‘pp’

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/mcf.c | 2 --
 1 file changed, 2 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/mcf.c b/drivers/tty/serial/mcf.c
index 1eb02bd74150..35f4719b2c0e 100644
--- a/drivers/tty/serial/mcf.c
+++ b/drivers/tty/serial/mcf.c
@@ -198,7 +198,6 @@ static void mcf_shutdown(struct uart_port *port)
 static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
 	struct ktermios *old)
 {
-	struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 	unsigned long flags;
 	unsigned int baud, baudclk;
 #if defined(CONFIG_M5272)
@@ -441,7 +440,6 @@ static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
 /* Enable or disable the RS485 support */
 static int mcf_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
 {
-	struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 	unsigned char mr1, mr2;
 
 	/* Get mode registers */
-- 
cgit v1.2.3-59-g8ed1b


From 201d8975ae5ada760bf29edd837da039f494709a Mon Sep 17 00:00:00 2001
From: Greg Ungerer <gerg@uclinux.org>
Date: Thu, 8 Jan 2015 14:19:51 +1000
Subject: serial: mcf: fix no driver name in probe output

The current output of the device probing looks like this:

ColdFire internal UART serial driver
(NULL device *): ttyS0 at MMIO 0xfc060000 (irq = 90, base_baud = 5208333) is a ColdFire UART
console [ttyS0] enabled
(NULL device *): ttyS1 at MMIO 0xfc064000 (irq = 91, base_baud = 5208333) is a ColdFire UART
(NULL device *): ttyS2 at MMIO 0xfc068000 (irq = 92, base_baud = 5208333) is a ColdFire UART

Fix the port device linkage at probing time so that the device name is
printed out properly, and not "(NULL device *)".

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/mcf.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/mcf.c b/drivers/tty/serial/mcf.c
index 35f4719b2c0e..a9b0ab38a68c 100644
--- a/drivers/tty/serial/mcf.c
+++ b/drivers/tty/serial/mcf.c
@@ -629,6 +629,7 @@ static int mcf_probe(struct platform_device *pdev)
 		port->mapbase = platp[i].mapbase;
 		port->membase = (platp[i].membase) ? platp[i].membase :
 			(unsigned char __iomem *) platp[i].mapbase;
+		port->dev = &pdev->dev;
 		port->iotype = SERIAL_IO_MEM;
 		port->irq = platp[i].irq;
 		port->uartclk = MCF_BUSCLK;
-- 
cgit v1.2.3-59-g8ed1b


From 00648d0282dcca1da453c0b20d27e24bf901a854 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 18 Dec 2014 18:47:12 +0100
Subject: tty: serial: 8250: omap: add ttySx console if the user didn't

This patch invokes add_preferred_console() with ttyS based on ttyO
arguments if the user didn't specify it on its own. This ensures that
the user will see the kernel booting on his serial console in case he
forgot to update the command line.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_omap.c | 40 +++++++++++++++++++++++++++++++++++++
 drivers/tty/serial/8250/Kconfig     | 19 ++++++++++++++++++
 2 files changed, 59 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 96b69bfd773f..273f37c6b493 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1248,6 +1248,46 @@ static int omap8250_runtime_resume(struct device *dev)
 }
 #endif
 
+#ifdef CONFIG_SERIAL_8250_OMAP_TTYO_FIXUP
+static int __init omap8250_console_fixup(void)
+{
+	char *omap_str;
+	char *options;
+	u8 idx;
+
+	if (strstr(boot_command_line, "console=ttyS"))
+		/* user set a ttyS based name for the console */
+		return 0;
+
+	omap_str = strstr(boot_command_line, "console=ttyO");
+	if (!omap_str)
+		/* user did not set ttyO based console, so we don't care */
+		return 0;
+
+	omap_str += 12;
+	if ('0' <= *omap_str && *omap_str <= '9')
+		idx = *omap_str - '0';
+	else
+		return 0;
+
+	omap_str++;
+	if (omap_str[0] == ',') {
+		omap_str++;
+		options = omap_str;
+	} else {
+		options = NULL;
+	}
+
+	add_preferred_console("ttyS", idx, options);
+	pr_err("WARNING: Your 'console=ttyO%d' has been replaced by 'ttyS%d'\n",
+	       idx, idx);
+	pr_err("This ensures that you still see kernel messages. Please\n");
+	pr_err("update your kernel commandline.\n");
+	return 0;
+}
+console_initcall(omap8250_console_fixup);
+#endif
+
 static const struct dev_pm_ops omap8250_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(omap8250_suspend, omap8250_resume)
 	SET_RUNTIME_PM_OPS(omap8250_runtime_suspend,
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 0fcbcd29502f..6f7f2d753def 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -308,6 +308,25 @@ config SERIAL_8250_OMAP
 
 	  This driver uses ttyS instead of ttyO.
 
+config SERIAL_8250_OMAP_TTYO_FIXUP
+	bool "Replace ttyO with ttyS"
+	depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE
+	default y
+	help
+	  This option replaces the "console=ttyO" argument with the matching
+	  ttyS argument if the user did not specified it on the command line.
+	  This ensures that the user can see the kernel output during boot
+	  which he wouldn't see otherwise. The getty has still to be configured
+	  for ttyS instead of ttyO regardless of this option.
+	  This option is intended for people who "automatically" enable this
+	  driver without knowing that this driver requires a different console=
+	  argument. If you read this, please keep this option disabled and
+	  instead update your kernel command line. If you prepare a kernel for a
+	  distribution or other kind of larger user base then you probably want
+	  to keep this option enabled. Otherwise people might complain about a
+	  not booting kernel because the serial console remains silent in case
+	  they forgot to update the command line.
+
 config SERIAL_8250_FINTEK
 	tristate "Support for Fintek F81216A LPC to 4 UART"
 	depends on SERIAL_8250 && PNP
-- 
cgit v1.2.3-59-g8ed1b


From fbf7ebe4d9faf2225d15edb9ebc66bf99800776a Mon Sep 17 00:00:00 2001
From: Pavel Machek <pavel@ucw.cz>
Date: Thu, 11 Dec 2014 22:44:26 +0100
Subject: trivial fixes for omap-serial

Trivial fixes for omap-serial.

Signed-off-by: Pavel Machek <pavel@ucw.cz>

index 18c30ca..f43ed2c 100644
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/omap-serial.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 2e1073da6719..b1cf9a3b673a 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -63,7 +63,7 @@
 #define UART_ERRATA_i202_MDR1_ACCESS	BIT(0)
 #define UART_ERRATA_i291_DMA_FORCEIDLE	BIT(1)
 
-#define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
+#define DEFAULT_CLK_SPEED 48000000 /* 48Mhz */
 
 /* SCR register bitmasks */
 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK		(1 << 7)
@@ -93,7 +93,7 @@
 /* WER = 0x7F
  * Enable module level wakeup in WER reg
  */
-#define OMAP_UART_WER_MOD_WKUP	0X7F
+#define OMAP_UART_WER_MOD_WKUP	0x7F
 
 /* Enable XON/XOFF flow control on output */
 #define OMAP_UART_SW_TX		0x08
@@ -114,7 +114,7 @@ struct uart_omap_dma {
 	dma_addr_t		tx_buf_dma_phys;
 	unsigned int		uart_base;
 	/*
-	 * Buffer for rx dma.It is not required for tx because the buffer
+	 * Buffer for rx dma. It is not required for tx because the buffer
 	 * comes from port structure.
 	 */
 	unsigned char		*rx_buf;
@@ -151,7 +151,7 @@ struct uart_omap_port {
 	int			use_dma;
 	/*
 	 * Some bits in registers are cleared on a read, so they must
-	 * be saved whenever the register is read but the bits will not
+	 * be saved whenever the register is read, but the bits will not
 	 * be immediately processed.
 	 */
 	unsigned int		lsr_break_flag;
-- 
cgit v1.2.3-59-g8ed1b


From 4bf4ea9dca4ba1984abeb592f429265b9bacac42 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Tue, 30 Dec 2014 20:28:15 -0500
Subject: serial: omap_8250: Fix RTS handling

The OMAP3 UART ignores MCR[1] (ie., UART_MCR_RTS) when in autoRTS
mode (UPF_HARD_FLOW + CRTSCTS). This makes it impossible for either
the serial core or userspace to manually flow control the sender.

Disable autoRTS mode when RTS is lowered and restore the previous
mode when RTS is raised.

Note that the OMAP3 UART provides no mechanism for switching from
autoRTS mode without corrupting incoming data; to access the
necessary register, the line control settings must be set to 8-e-2
and thus any data received during that time will be interpreted with
those settings. This corruption has been observed in practice.

Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_core.c | 12 +++++++++++-
 drivers/tty/serial/8250/8250_omap.c | 25 ++++++++++++++++++++++---
 include/linux/serial_8250.h         |  1 +
 include/linux/serial_core.h         |  1 +
 4 files changed, 35 insertions(+), 4 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 11c66856ba2f..3bfcfdb57d05 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1924,7 +1924,7 @@ static unsigned int serial8250_get_mctrl(struct uart_port *port)
 	return ret;
 }
 
-static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
+void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned char mcr = 0;
@@ -1944,6 +1944,14 @@ static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
 
 	serial_port_out(port, UART_MCR, mcr);
 }
+EXPORT_SYMBOL_GPL(serial8250_do_set_mctrl);
+
+static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	if (port->set_mctrl)
+		return port->set_mctrl(port, mctrl);
+	return serial8250_do_set_mctrl(port, mctrl);
+}
 
 static void serial8250_break_ctl(struct uart_port *port, int break_state)
 {
@@ -3605,6 +3613,8 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
 		/*  Possibly override set_termios call */
 		if (up->port.set_termios)
 			uart->port.set_termios = up->port.set_termios;
+		if (up->port.set_mctrl)
+			uart->port.set_mctrl = up->port.set_mctrl;
 		if (up->port.startup)
 			uart->port.startup = up->port.startup;
 		if (up->port.shutdown)
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 273f37c6b493..227033db214b 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -106,6 +106,27 @@ static u32 uart_read(struct uart_8250_port *up, u32 reg)
 	return readl(up->port.membase + (reg << up->port.regshift));
 }
 
+static void omap8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	struct uart_8250_port *up = up_to_u8250p(port);
+	struct omap8250_priv *priv = up->port.private_data;
+	u8 lcr;
+
+	serial8250_do_set_mctrl(port, mctrl);
+
+	/*
+	 * Turn off autoRTS if RTS is lowered and restore autoRTS setting
+	 * if RTS is raised
+	 */
+	lcr = serial_in(up, UART_LCR);
+	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+	if (mctrl & TIOCM_RTS)
+		serial_out(up, UART_EFR, priv->efr);
+	else
+		serial_out(up, UART_EFR, priv->efr & ~UART_EFR_RTS);
+	serial_out(up, UART_LCR, lcr);
+}
+
 /*
  * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
  * The access to uart register after MDR1 Access
@@ -400,9 +421,6 @@ static void omap_8250_set_termios(struct uart_port *port,
 	if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
 		/* Enable AUTORTS and AUTOCTS */
 		priv->efr |= UART_EFR_CTS | UART_EFR_RTS;
-
-		/* Ensure MCR RTS is asserted */
-		up->mcr |= UART_MCR_RTS;
 	} else	if (up->port.flags & UPF_SOFT_FLOW) {
 		/*
 		 * IXON Flag:
@@ -1007,6 +1025,7 @@ static int omap8250_probe(struct platform_device *pdev)
 	up.capabilities |= UART_CAP_RPM;
 #endif
 	up.port.set_termios = omap_8250_set_termios;
+	up.port.set_mctrl = omap8250_set_mctrl;
 	up.port.pm = omap_8250_pm;
 	up.port.startup = omap_8250_startup;
 	up.port.shutdown = omap_8250_shutdown;
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index e02acf0a0ec9..245b959f1ff6 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -126,6 +126,7 @@ extern int serial8250_do_startup(struct uart_port *port);
 extern void serial8250_do_shutdown(struct uart_port *port);
 extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
 			     unsigned int oldstate);
+extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
 extern int fsl8250_handle_irq(struct uart_port *port);
 int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
 unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 057038cf2788..a0c7033d5f91 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -123,6 +123,7 @@ struct uart_port {
 	void			(*set_termios)(struct uart_port *,
 				               struct ktermios *new,
 				               struct ktermios *old);
+	void			(*set_mctrl)(struct uart_port *, unsigned int);
 	int			(*startup)(struct uart_port *port);
 	void			(*shutdown)(struct uart_port *port);
 	void			(*throttle)(struct uart_port *port);
-- 
cgit v1.2.3-59-g8ed1b


From 3e29af27c4686d9cb401a63c7eeb6376662b13c1 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Wed, 31 Dec 2014 16:32:49 -0500
Subject: serial: omap_8250: Fix RTS handling, part B

Because the OMAP3 UART ignores MCR[1] (RTS) in autoRTS mode, autoRTS
mode must not be enabled unless RTS is set (or port->mctrl & TIOCM_RTS,
which is equivalent).

Fixes premature raising of RTS in omap_8250_set_termios() -- RTS was
raised even before UART mode was selected.
Fixes raise of RTS after port has been shutdown; omap_8250_pm() re-enabled
RTS after omap_8250_shutdown().

Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_omap.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 227033db214b..7c485eaf7dd1 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -272,7 +272,10 @@ static void omap8250_restore_regs(struct uart_8250_port *up)
 	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 	serial_dl_write(up, priv->quot);
 
-	serial_out(up, UART_EFR, priv->efr);
+	if (up->port.mctrl & TIOCM_RTS)
+		serial_out(up, UART_EFR, priv->efr);
+	else
+		serial_out(up, UART_EFR, priv->efr & ~UART_EFR_RTS);
 
 	/* Configure flow control */
 	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
@@ -468,18 +471,18 @@ static void omap_8250_set_termios(struct uart_port *port,
 static void omap_8250_pm(struct uart_port *port, unsigned int state,
 			 unsigned int oldstate)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
-	struct omap8250_priv *priv = up->port.private_data;
+	struct uart_8250_port *up = up_to_u8250p(port);
+	u8 efr;
 
 	pm_runtime_get_sync(port->dev);
 	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
-	serial_out(up, UART_EFR, priv->efr | UART_EFR_ECB);
+	efr = serial_in(up, UART_EFR);
+	serial_out(up, UART_EFR, efr | UART_EFR_ECB);
 	serial_out(up, UART_LCR, 0);
 
 	serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
 	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
-	serial_out(up, UART_EFR, priv->efr);
+	serial_out(up, UART_EFR, efr);
 	serial_out(up, UART_LCR, 0);
 
 	pm_runtime_mark_last_busy(port->dev);
-- 
cgit v1.2.3-59-g8ed1b


From 11387b0a46a4b19f3aa8c7b85faff31d9bc1e471 Mon Sep 17 00:00:00 2001
From: Fabio Estevam <fabio.estevam@freescale.com>
Date: Thu, 27 Nov 2014 17:08:30 -0200
Subject: serial: mxs-auart: Remove unneeded goto label

Instead of jumping to the 'out' label, let's return the error immediately, which
makes the code shorter and cleaner.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/mxs-auart.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index ec553f8eb218..a9e7fa68b75e 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1232,10 +1232,8 @@ static int mxs_auart_probe(struct platform_device *pdev)
 	struct resource *r;
 
 	s = kzalloc(sizeof(struct mxs_auart_port), GFP_KERNEL);
-	if (!s) {
-		ret = -ENOMEM;
-		goto out;
-	}
+	if (!s)
+		return -ENOMEM;
 
 	ret = serial_mxs_probe_dt(s, pdev);
 	if (ret > 0)
@@ -1314,7 +1312,6 @@ out_free_clk:
 	clk_put(s->clk);
 out_free:
 	kfree(s);
-out:
 	return ret;
 }
 
-- 
cgit v1.2.3-59-g8ed1b


From 46778bcad73d0546c6fac24110dba5110902141f Mon Sep 17 00:00:00 2001
From: Fabio Estevam <fabio.estevam@freescale.com>
Date: Thu, 27 Nov 2014 17:08:31 -0200
Subject: serial: mxs-auart: Use devm_kzalloc()

By using devm_kzalloc() we can have a shorter and cleaner code.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/mxs-auart.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index a9e7fa68b75e..0b5f0ead6b73 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1231,7 +1231,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
 	int ret = 0;
 	struct resource *r;
 
-	s = kzalloc(sizeof(struct mxs_auart_port), GFP_KERNEL);
+	s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
 	if (!s)
 		return -ENOMEM;
 
@@ -1239,7 +1239,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
 	if (ret > 0)
 		s->port.line = pdev->id < 0 ? 0 : pdev->id;
 	else if (ret < 0)
-		goto out_free;
+		return ret;
 
 	if (of_id) {
 		pdev->id_entry = of_id->data;
@@ -1247,10 +1247,8 @@ static int mxs_auart_probe(struct platform_device *pdev)
 	}
 
 	s->clk = clk_get(&pdev->dev, NULL);
-	if (IS_ERR(s->clk)) {
-		ret = PTR_ERR(s->clk);
-		goto out_free;
-	}
+	if (IS_ERR(s->clk))
+		return PTR_ERR(s->clk);
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!r) {
@@ -1310,8 +1308,6 @@ out_free_irq:
 	free_irq(s->irq, s);
 out_free_clk:
 	clk_put(s->clk);
-out_free:
-	kfree(s);
 	return ret;
 }
 
@@ -1326,7 +1322,6 @@ static int mxs_auart_remove(struct platform_device *pdev)
 	mxs_auart_free_gpio_irq(s);
 	clk_put(s->clk);
 	free_irq(s->irq, s);
-	kfree(s);
 
 	return 0;
 }
-- 
cgit v1.2.3-59-g8ed1b


From 75beb268550d11e66c372dd6da309dce659da7f7 Mon Sep 17 00:00:00 2001
From: Fabio Estevam <fabio.estevam@freescale.com>
Date: Thu, 27 Nov 2014 17:08:32 -0200
Subject: serial: mxs-auart: Use devm_clk_get()

By using devm_clk_get() we can have a shorter and cleaner code.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/mxs-auart.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 0b5f0ead6b73..9309082e4937 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1246,15 +1246,14 @@ static int mxs_auart_probe(struct platform_device *pdev)
 		s->devtype = pdev->id_entry->driver_data;
 	}
 
-	s->clk = clk_get(&pdev->dev, NULL);
+	s->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(s->clk))
 		return PTR_ERR(s->clk);
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!r) {
-		ret = -ENXIO;
-		goto out_free_clk;
-	}
+	if (!r)
+		return -ENXIO;
+
 
 	s->port.mapbase = r->start;
 	s->port.membase = ioremap(r->start, resource_size(r));
@@ -1271,7 +1270,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
 	s->port.irq = s->irq;
 	ret = request_irq(s->irq, mxs_auart_irq_handle, 0, dev_name(&pdev->dev), s);
 	if (ret)
-		goto out_free_clk;
+		return ret;
 
 	platform_set_drvdata(pdev, s);
 
@@ -1306,8 +1305,6 @@ out_free_gpio_irq:
 out_free_irq:
 	auart_port[pdev->id] = NULL;
 	free_irq(s->irq, s);
-out_free_clk:
-	clk_put(s->clk);
 	return ret;
 }
 
@@ -1320,7 +1317,6 @@ static int mxs_auart_remove(struct platform_device *pdev)
 	auart_port[pdev->id] = NULL;
 
 	mxs_auart_free_gpio_irq(s);
-	clk_put(s->clk);
 	free_irq(s->irq, s);
 
 	return 0;
-- 
cgit v1.2.3-59-g8ed1b


From 9e5df9f88c5d874a9154e137a2e99413750540cd Mon Sep 17 00:00:00 2001
From: Fabio Estevam <fabio.estevam@freescale.com>
Date: Thu, 27 Nov 2014 17:08:33 -0200
Subject: serial: mxs-auart: Use devm_request_irq()

By using devm_request_irq() we can have a shorter and cleaner code.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/mxs-auart.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 9309082e4937..1e9fb370600b 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1268,7 +1268,8 @@ static int mxs_auart_probe(struct platform_device *pdev)
 
 	s->irq = platform_get_irq(pdev, 0);
 	s->port.irq = s->irq;
-	ret = request_irq(s->irq, mxs_auart_irq_handle, 0, dev_name(&pdev->dev), s);
+	ret = devm_request_irq(&pdev->dev, s->irq, mxs_auart_irq_handle, 0,
+			       dev_name(&pdev->dev), s);
 	if (ret)
 		return ret;
 
@@ -1283,7 +1284,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
 	 */
 	ret = mxs_auart_request_gpio_irq(s);
 	if (ret)
-		goto out_free_irq;
+		return ret;
 
 	auart_port[s->port.line] = s;
 
@@ -1302,9 +1303,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
 
 out_free_gpio_irq:
 	mxs_auart_free_gpio_irq(s);
-out_free_irq:
 	auart_port[pdev->id] = NULL;
-	free_irq(s->irq, s);
 	return ret;
 }
 
@@ -1313,11 +1312,8 @@ static int mxs_auart_remove(struct platform_device *pdev)
 	struct mxs_auart_port *s = platform_get_drvdata(pdev);
 
 	uart_remove_one_port(&auart_driver, &s->port);
-
 	auart_port[pdev->id] = NULL;
-
 	mxs_auart_free_gpio_irq(s);
-	free_irq(s->irq, s);
 
 	return 0;
 }
-- 
cgit v1.2.3-59-g8ed1b


From 9bdd6369aa64fade997c6f11325f7c7b60ec3f6a Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Fri, 28 Nov 2014 16:17:11 +0200
Subject: serial: 8250_dma: terminate transfer explicitly when timeout

There is no need to terminate transfer in the __dma_rx_complete() since it's
called at the end of transfer. Special case when serial timeout occurs is
handled separately where we have to terminate transfer.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index fcd7ac6af2fc..e508939daea3 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -59,7 +59,6 @@ static void __dma_rx_complete(void *param)
 
 	dma->rx_running = 0;
 	dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state);
-	dmaengine_terminate_all(dma->rxchan);
 
 	count = dma->rx_size - state.residue;
 
@@ -131,6 +130,7 @@ int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
 		if (dma->rx_running) {
 			dmaengine_pause(dma->rxchan);
 			__dma_rx_complete(p);
+			dmaengine_terminate_all(dma->rxchan);
 		}
 		return -ETIMEDOUT;
 	default:
-- 
cgit v1.2.3-59-g8ed1b


From 5e1aeea52f6a0763e79473b1767401fda88eb7e1 Mon Sep 17 00:00:00 2001
From: Feng Kan <fkan@apm.com>
Date: Fri, 5 Dec 2014 17:45:57 -0800
Subject: serial: 8250: add support for ACPI-probed serial port for X-Gene
 platform

Enable APM X-Gene SoC serial port functionality when using ACPI table to
initialize serial port.

Signed-off-by: Feng Kan <fkan@apm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_dw.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 555de07db593..e60116235836 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -351,10 +351,20 @@ static int dw8250_probe_of(struct uart_port *p,
 static int dw8250_probe_acpi(struct uart_8250_port *up,
 			     struct dw8250_data *data)
 {
+	const struct acpi_device_id *id;
 	struct uart_port *p = &up->port;
 
 	dw8250_setup_port(up);
 
+	id = acpi_match_device(p->dev->driver->acpi_match_table, p->dev);
+	if (!id)
+		return -ENODEV;
+
+	if (!p->uartclk)
+		if (device_property_read_u32(p->dev, "clock-frequency",
+					     &p->uartclk))
+			return -EINVAL;
+
 	p->iotype = UPIO_MEM32;
 	p->serial_in = dw8250_serial_in32;
 	p->serial_out = dw8250_serial_out32;
@@ -577,6 +587,7 @@ static const struct acpi_device_id dw8250_acpi_match[] = {
 	{ "INT3435", 0 },
 	{ "80860F0A", 0 },
 	{ "8086228A", 0 },
+	{ "APMC0D08", 0},
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match);
-- 
cgit v1.2.3-59-g8ed1b


From 2e4081367bb108db0b20e1cbb09fcb8885f894b3 Mon Sep 17 00:00:00 2001
From: Wolfram Sang <wsa@the-dreams.de>
Date: Sun, 21 Dec 2014 22:14:41 +0100
Subject: tty: serial: 8250: drop owner assignment from platform_drivers

This platform_driver does not need to set an owner, it will be populated by the
driver core.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_omap.c | 1 -
 1 file changed, 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 7c485eaf7dd1..9191d05cfaf0 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1331,7 +1331,6 @@ static struct platform_driver omap8250_platform_driver = {
 		.name		= "omap8250",
 		.pm		= &omap8250_dev_pm_ops,
 		.of_match_table = omap8250_dt_ids,
-		.owner		= THIS_MODULE,
 	},
 	.probe			= omap8250_probe,
 	.remove			= omap8250_remove,
-- 
cgit v1.2.3-59-g8ed1b


From eef15e2a54fad4c2ce3f0a81485dc591ce678f4f Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Tue, 30 Dec 2014 07:11:11 -0500
Subject: tty: Remove warning in tty_lock_slave()

Commit 2aff5e2bc62db43e05c814461a08aff0fc2b7fe5 ('tty: Change
tty lock order to master->slave') added a warning which is broken
and unnecessary now that the tty lock has fixed lock subclasses,
added in commit 2febdb632bb96235b94b8fccaf882a78f8f4b2bb
('tty: Preset lock subclass for nested tty locks').

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/tty_mutex.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/tty_mutex.c b/drivers/tty/tty_mutex.c
index 4486741190c4..a872389dc0bc 100644
--- a/drivers/tty/tty_mutex.c
+++ b/drivers/tty/tty_mutex.c
@@ -46,12 +46,8 @@ EXPORT_SYMBOL(tty_unlock);
 
 void __lockfunc tty_lock_slave(struct tty_struct *tty)
 {
-	if (tty && tty != tty->link) {
-		WARN_ON(!mutex_is_locked(&tty->link->legacy_mutex) ||
-			!tty->driver->type == TTY_DRIVER_TYPE_PTY ||
-			!tty->driver->type == PTY_TYPE_SLAVE);
+	if (tty && tty != tty->link)
 		tty_lock(tty);
-	}
 }
 
 void __lockfunc tty_unlock_slave(struct tty_struct *tty)
-- 
cgit v1.2.3-59-g8ed1b


From 057badd6885b7149a0d083b35ffaac0c00937309 Mon Sep 17 00:00:00 2001
From: Barry Song <Baohua.Song@csr.com>
Date: Sat, 3 Jan 2015 17:02:57 +0800
Subject: serial: sirf: rename marco to atlas7

MARCO will not be supported any more and the project was dropped.
it has been replaced by CSR atlas7.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 .../devicetree/bindings/serial/sirf-uart.txt       |  4 +--
 drivers/tty/serial/sirfsoc_uart.c                  | 40 +++++++++++-----------
 drivers/tty/serial/sirfsoc_uart.h                  |  4 +--
 3 files changed, 24 insertions(+), 24 deletions(-)

(limited to 'drivers/tty')

diff --git a/Documentation/devicetree/bindings/serial/sirf-uart.txt b/Documentation/devicetree/bindings/serial/sirf-uart.txt
index 3acdd969edf1..f0c39261c5d4 100644
--- a/Documentation/devicetree/bindings/serial/sirf-uart.txt
+++ b/Documentation/devicetree/bindings/serial/sirf-uart.txt
@@ -2,7 +2,7 @@
 
 Required properties:
 - compatible : Should be "sirf,prima2-uart", "sirf, prima2-usp-uart",
-		"sirf,marco-uart" or "sirf,marco-bt-uart" which means
+		"sirf,atlas7-uart" or "sirf,atlas7-bt-uart" which means
 		uart located in BT module and used for BT.
 - reg : Offset and length of the register set for the device
 - interrupts : Should contain uart interrupt
@@ -37,7 +37,7 @@ usp@b0090000 {
 for uart use in BT module,
 uart6: uart@11000000 {
 	cell-index = <6>;
-	compatible = "sirf,marco-bt-uart", "sirf,marco-uart";
+	compatible = "sirf,atlas7-bt-uart", "sirf,atlas7-uart";
 	reg = <0x11000000 0x1000>;
 	interrupts = <0 100 0>;
 	clocks = <&clks 138>, <&clks 140>, <&clks 141>;
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index b269f6bd16d6..27ed0e960880 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -177,7 +177,7 @@ static void sirfsoc_uart_stop_tx(struct uart_port *port)
 			dmaengine_pause(sirfport->tx_dma_chan);
 			sirfport->tx_dma_state = TX_DMA_PAUSE;
 		} else {
-			if (!sirfport->is_marco)
+			if (!sirfport->is_atlas7)
 				wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg) &
 				~uint_en->sirfsoc_txfifo_empty_en);
@@ -186,7 +186,7 @@ static void sirfsoc_uart_stop_tx(struct uart_port *port)
 				uint_en->sirfsoc_txfifo_empty_en);
 		}
 	} else {
-		if (!sirfport->is_marco)
+		if (!sirfport->is_atlas7)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg) &
 				~uint_en->sirfsoc_txfifo_empty_en);
@@ -217,7 +217,7 @@ static void sirfsoc_uart_tx_with_dma(struct sirfsoc_uart_port *sirfport)
 	}
 	if (sirfport->tx_dma_state == TX_DMA_RUNNING)
 		return;
-	if (!sirfport->is_marco)
+	if (!sirfport->is_atlas7)
 		wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg)&
 				~(uint_en->sirfsoc_txfifo_empty_en));
@@ -244,7 +244,7 @@ static void sirfsoc_uart_tx_with_dma(struct sirfsoc_uart_port *sirfport)
 		}
 		if (tran_size < 4)
 			sirfsoc_uart_pio_tx_chars(sirfport, tran_size);
-		if (!sirfport->is_marco)
+		if (!sirfport->is_atlas7)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg)|
 				uint_en->sirfsoc_txfifo_empty_en);
@@ -293,7 +293,7 @@ static void sirfsoc_uart_start_tx(struct uart_port *port)
 		sirfsoc_uart_pio_tx_chars(sirfport,
 			SIRFSOC_UART_IO_TX_REASONABLE_CNT);
 		wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START);
-		if (!sirfport->is_marco)
+		if (!sirfport->is_atlas7)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 					rd_regl(port, ureg->sirfsoc_int_en_reg)|
 					uint_en->sirfsoc_txfifo_empty_en);
@@ -311,7 +311,7 @@ static void sirfsoc_uart_stop_rx(struct uart_port *port)
 
 	wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
 	if (sirfport->rx_dma_chan) {
-		if (!sirfport->is_marco)
+		if (!sirfport->is_atlas7)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg) &
 				~(SIRFUART_RX_DMA_INT_EN(port, uint_en) |
@@ -322,7 +322,7 @@ static void sirfsoc_uart_stop_rx(struct uart_port *port)
 					uint_en->sirfsoc_rx_done_en);
 		dmaengine_terminate_all(sirfport->rx_dma_chan);
 	} else {
-		if (!sirfport->is_marco)
+		if (!sirfport->is_atlas7)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg)&
 				~(SIRFUART_RX_IO_INT_EN(port, uint_en)));
@@ -344,7 +344,7 @@ static void sirfsoc_uart_disable_ms(struct uart_port *port)
 	if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
 		wr_regl(port, ureg->sirfsoc_afc_ctrl,
 				rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0x3FF);
-		if (!sirfport->is_marco)
+		if (!sirfport->is_atlas7)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 					rd_regl(port, ureg->sirfsoc_int_en_reg)&
 					~uint_en->sirfsoc_cts_en);
@@ -380,7 +380,7 @@ static void sirfsoc_uart_enable_ms(struct uart_port *port)
 		wr_regl(port, ureg->sirfsoc_afc_ctrl,
 				rd_regl(port, ureg->sirfsoc_afc_ctrl) |
 				SIRFUART_AFC_TX_EN | SIRFUART_AFC_RX_EN);
-		if (!sirfport->is_marco)
+		if (!sirfport->is_atlas7)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 					rd_regl(port, ureg->sirfsoc_int_en_reg)
 					| uint_en->sirfsoc_cts_en);
@@ -544,7 +544,7 @@ static void sirfsoc_rx_tmo_process_tl(unsigned long param)
 		sirfport->rx_io_count = 0;
 		wr_regl(port, ureg->sirfsoc_int_st_reg,
 				uint_st->sirfsoc_rx_done);
-		if (!sirfport->is_marco)
+		if (!sirfport->is_atlas7)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg) &
 				~(uint_en->sirfsoc_rx_done_en));
@@ -555,7 +555,7 @@ static void sirfsoc_rx_tmo_process_tl(unsigned long param)
 	} else {
 		wr_regl(port, ureg->sirfsoc_int_st_reg,
 				uint_st->sirfsoc_rx_done);
-		if (!sirfport->is_marco)
+		if (!sirfport->is_atlas7)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg) |
 				(uint_en->sirfsoc_rx_done_en));
@@ -578,7 +578,7 @@ static void sirfsoc_uart_handle_rx_tmo(struct sirfsoc_uart_port *sirfport)
 	dmaengine_terminate_all(sirfport->rx_dma_chan);
 	sirfport->rx_dma_items[sirfport->rx_issued].xmit.head =
 		SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue;
-	if (!sirfport->is_marco)
+	if (!sirfport->is_atlas7)
 		wr_regl(port, ureg->sirfsoc_int_en_reg,
 			rd_regl(port, ureg->sirfsoc_int_en_reg) &
 			~(uint_en->sirfsoc_rx_timeout_en));
@@ -598,7 +598,7 @@ static void sirfsoc_uart_handle_rx_done(struct sirfsoc_uart_port *sirfport)
 	sirfsoc_uart_pio_rx_chars(port, 4 - sirfport->rx_io_count);
 	if (sirfport->rx_io_count == 4) {
 		sirfport->rx_io_count = 0;
-		if (!sirfport->is_marco)
+		if (!sirfport->is_atlas7)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg) &
 				~(uint_en->sirfsoc_rx_done_en));
@@ -748,7 +748,7 @@ static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port)
 	for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++)
 		sirfsoc_rx_submit_one_dma_desc(port, i);
 	sirfport->rx_completed = sirfport->rx_issued = 0;
-	if (!sirfport->is_marco)
+	if (!sirfport->is_atlas7)
 		wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg) |
 				SIRFUART_RX_DMA_INT_EN(port, uint_en));
@@ -770,7 +770,7 @@ static void sirfsoc_uart_start_rx(struct uart_port *port)
 	if (sirfport->rx_dma_chan)
 		sirfsoc_uart_start_next_rx_dma(port);
 	else {
-		if (!sirfport->is_marco)
+		if (!sirfport->is_atlas7)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg) |
 				SIRFUART_RX_IO_INT_EN(port, uint_en));
@@ -1124,7 +1124,7 @@ static void sirfsoc_uart_shutdown(struct uart_port *port)
 {
 	struct sirfsoc_uart_port *sirfport = to_sirfport(port);
 	struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
-	if (!sirfport->is_marco)
+	if (!sirfport->is_atlas7)
 		wr_regl(port, ureg->sirfsoc_int_en_reg, 0);
 	else
 		wr_regl(port, SIRFUART_INT_EN_CLR, ~0UL);
@@ -1271,7 +1271,7 @@ static struct uart_driver sirfsoc_uart_drv = {
 
 static struct of_device_id sirfsoc_uart_ids[] = {
 	{ .compatible = "sirf,prima2-uart", .data = &sirfsoc_uart,},
-	{ .compatible = "sirf,marco-uart", .data = &sirfsoc_uart},
+	{ .compatible = "sirf,atlas7-uart", .data = &sirfsoc_uart},
 	{ .compatible = "sirf,prima2-usp-uart", .data = &sirfsoc_usp},
 	{}
 };
@@ -1350,8 +1350,8 @@ static int sirfsoc_uart_probe(struct platform_device *pdev)
 		gpio_direction_output(sirfport->rts_gpio, 1);
 	}
 usp_no_flow_control:
-	if (of_device_is_compatible(pdev->dev.of_node, "sirf,marco-uart"))
-		sirfport->is_marco = true;
+	if (of_device_is_compatible(pdev->dev.of_node, "sirf,atlas7-uart"))
+		sirfport->is_atlas7 = true;
 
 	if (of_property_read_u32(pdev->dev.of_node,
 			"fifosize",
@@ -1393,7 +1393,7 @@ usp_no_flow_control:
 		goto err;
 	}
 	port->uartclk = clk_get_rate(sirfport->clk);
-	if (of_device_is_compatible(pdev->dev.of_node, "sirf,marco-bt-uart")) {
+	if (of_device_is_compatible(pdev->dev.of_node, "sirf,atlas7-bt-uart")) {
 		sirfport->clk_general = devm_clk_get(&pdev->dev, "general");
 		if (IS_ERR(sirfport->clk_general)) {
 			ret = PTR_ERR(sirfport->clk_general);
diff --git a/drivers/tty/serial/sirfsoc_uart.h b/drivers/tty/serial/sirfsoc_uart.h
index 275d03893990..727eb6b88fff 100644
--- a/drivers/tty/serial/sirfsoc_uart.h
+++ b/drivers/tty/serial/sirfsoc_uart.h
@@ -421,8 +421,8 @@ struct sirfsoc_uart_port {
 	bool				is_bt_uart;
 	struct clk			*clk_general;
 	struct clk			*clk_noc;
-	/* for SiRFmarco, there are SET/CLR for UART_INT_EN */
-	bool				is_marco;
+	/* for SiRFatlas7, there are SET/CLR for UART_INT_EN */
+	bool				is_atlas7;
 	struct sirfsoc_uart_register	*uart_reg;
 	struct dma_chan			*rx_dma_chan;
 	struct dma_chan			*tx_dma_chan;
-- 
cgit v1.2.3-59-g8ed1b


From 485819b5b9ed82372dacae775998f3c33717f7fe Mon Sep 17 00:00:00 2001
From: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Date: Tue, 9 Dec 2014 14:31:32 +0100
Subject: tty/serial: at91: use correct type for dma_sync_*_for_cpu() and
 dma_sync_*_for_device()

dma_sync_*_for_cpu() and dma_sync_*_for_device() use 'enum dma_data_direction',
not 'enum dma_transfer_direction'

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/atmel_serial.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 4d848a29e223..756f567527c4 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -794,7 +794,7 @@ static void atmel_tx_dma(struct uart_port *port)
 			return;
 		}
 
-		dma_sync_sg_for_device(port->dev, sg, 1, DMA_MEM_TO_DEV);
+		dma_sync_sg_for_device(port->dev, sg, 1, DMA_TO_DEVICE);
 
 		atmel_port->desc_tx = desc;
 		desc->callback = atmel_complete_tx_dma;
@@ -927,7 +927,7 @@ static void atmel_rx_from_dma(struct uart_port *port)
 	dma_sync_sg_for_cpu(port->dev,
 			    &atmel_port->sg_rx,
 			    1,
-			    DMA_DEV_TO_MEM);
+			    DMA_FROM_DEVICE);
 
 	/*
 	 * ring->head points to the end of data already written by the DMA.
@@ -974,7 +974,7 @@ static void atmel_rx_from_dma(struct uart_port *port)
 	dma_sync_sg_for_device(port->dev,
 			       &atmel_port->sg_rx,
 			       1,
-			       DMA_DEV_TO_MEM);
+			       DMA_FROM_DEVICE);
 
 	/*
 	 * Drop the lock here since it might end up calling
-- 
cgit v1.2.3-59-g8ed1b


From d4f641876a68d1961e30c202709cc2d484f69f6f Mon Sep 17 00:00:00 2001
From: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Date: Tue, 9 Dec 2014 14:31:33 +0100
Subject: tty/serial: at91: enable peripheral clock before accessing I/O
 registers

atmel_serial_probe() calls atmel_init_port(). In turn, atmel_init_port() calls
clk_disable_unprepare() to disable the peripheral clock before returning.

Later atmel_serial_probe() accesses some I/O registers such as the Mode and
Control registers for RS485 support then the Name and Version registers, through a call to
atmel_get_ip_name(), but at that moment the peripheral clock was still
disabled.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: <stable@vger.kernel.org> # 3.12+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/atmel_serial.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 756f567527c4..c6621dc296c0 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -2596,6 +2596,12 @@ static int atmel_serial_probe(struct platform_device *pdev)
 	device_init_wakeup(&pdev->dev, 1);
 	platform_set_drvdata(pdev, port);
 
+	/*
+	 * The peripheral clock has been disabled by atmel_init_port():
+	 * enable it before accessing I/O registers
+	 */
+	clk_prepare_enable(port->clk);
+
 	if (rs485_enabled) {
 		UART_PUT_MR(&port->uart, ATMEL_US_USMODE_NORMAL);
 		UART_PUT_CR(&port->uart, ATMEL_US_RTSEN);
@@ -2606,6 +2612,12 @@ static int atmel_serial_probe(struct platform_device *pdev)
 	 */
 	atmel_get_ip_name(&port->uart);
 
+	/*
+	 * The peripheral clock can now safely be disabled till the port
+	 * is used
+	 */
+	clk_disable_unprepare(port->clk);
+
 	return 0;
 
 err_add_port:
-- 
cgit v1.2.3-59-g8ed1b


From 6fbb9bdf0f3fbe23aeff806489791aa876adaffb Mon Sep 17 00:00:00 2001
From: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Date: Tue, 9 Dec 2014 14:31:34 +0100
Subject: tty/serial: at91: fix error handling in atmel_serial_probe()

-EDEFER error wasn't handle properly by atmel_serial_probe().
As an example, when atmel_serial_probe() is called for the first time, we pass
the test_and_set_bit() test to check whether the port has already been
initalized. Then we call atmel_init_port(), which may return -EDEFER, possibly
returned before by clk_get(). Consequently atmel_serial_probe() used to return
this error code WITHOUT clearing the port bit in the "atmel_ports_in_use" mask.
When atmel_serial_probe() was called for the second time, it used to fail on
the test_and_set_bit() function then returning -EBUSY.

When atmel_serial_probe() fails, this patch make it clear the port bit in the
"atmel_ports_in_use" mask, if needed, before returning the error code.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: <stable@vger.kernel.org> # 3.12+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/atmel_serial.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index c6621dc296c0..92a8b263735a 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -2565,7 +2565,7 @@ static int atmel_serial_probe(struct platform_device *pdev)
 
 	ret = atmel_init_port(port, pdev);
 	if (ret)
-		goto err;
+		goto err_clear_bit;
 
 	if (!atmel_use_pdc_rx(&port->uart)) {
 		ret = -ENOMEM;
@@ -2628,6 +2628,8 @@ err_alloc_ring:
 		clk_put(port->clk);
 		port->clk = NULL;
 	}
+err_clear_bit:
+	clear_bit(port->uart.line, atmel_ports_in_use);
 err:
 	return ret;
 }
-- 
cgit v1.2.3-59-g8ed1b


From 1cf6e8fc8341e54f28aad706544a1d50c3a82ddc Mon Sep 17 00:00:00 2001
From: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Date: Tue, 9 Dec 2014 14:31:35 +0100
Subject: tty/serial: at91: fix RTS line management when hardware handshake is
 enabled

This patch fixes many bugs in the code dealing with the hardware handshake.

As an example, in atmel_set_termios(), we used to test whether the CRTSCTS
c_cflag was set. If so, we selected the "Hardware Handshake" mode through the
Mode Register. However, few lines below the mode was reset to "Normal" (0).
So there was no way to select the "Hardware Handshake" mode. To fix this issue,
we moved the CRTSCRTS c_cflag test AFTER the mode has been reset to "Normal".

Also setting the RTSEN and RTSDIS bits in the Control Register has different
results whether the USART is set in "Normal" or "Hardware Handshake" mode:

1) "Normal" mode
- the RTSEN bit forces the RTS line to low level, which tells the remote peer
  that we are ready to received new data.
- the RTSDIS bit forces the RTS line to high level, which tells the remote peer
  to stop sending new data.

2) "Hardware Handshake" mode
- the RTSEN bit forces the RTS line to high level.
- the RTSDIS bit lets the hardware control the RTS line.

WARNING:
when FIFOs are not available or not enabled, the RTS line is controlled by the
PDC. This is why using the Hardware Handshake mode requires using the PDC
channel for reception. However the Hardware Handshake mode DOES NOT work with
DMA controller since it cannot control the RTS line.
Future designs with FIFOs will introduce a new feature: the RTS line will be
controlled by the RX FIFO using thresholds. This patch was tested with this new
design.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/atmel_serial.c | 91 ++++++++++++++++++++++++++-------------
 1 file changed, 61 insertions(+), 30 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 92a8b263735a..9e0c63676f0a 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -341,13 +341,37 @@ static u_int atmel_tx_empty(struct uart_port *port)
 static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
 {
 	unsigned int control = 0;
-	unsigned int mode;
+	unsigned int mode = UART_GET_MR(port);
+	unsigned int rts_paused, rts_ready;
 	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
 
+	/* override mode to RS485 if needed, otherwise keep the current mode */
+	if (port->rs485.flags & SER_RS485_ENABLED) {
+		if ((port->rs485.delay_rts_after_send) > 0)
+			UART_PUT_TTGR(port, port->rs485.delay_rts_after_send);
+		mode &= ~ATMEL_US_USMODE;
+		mode |= ATMEL_US_USMODE_RS485;
+	}
+
+	/* set the RTS line state according to the mode */
+	if ((mode & ATMEL_US_USMODE) == ATMEL_US_USMODE_HWHS) {
+		/* force RTS line to high level */
+		rts_paused = ATMEL_US_RTSEN;
+
+		/* give the control of the RTS line back to the hardware */
+		rts_ready = ATMEL_US_RTSDIS;
+	} else {
+		/* force RTS line to high level */
+		rts_paused = ATMEL_US_RTSDIS;
+
+		/* force RTS line to low level */
+		rts_ready = ATMEL_US_RTSEN;
+	}
+
 	if (mctrl & TIOCM_RTS)
-		control |= ATMEL_US_RTSEN;
+		control |= rts_ready;
 	else
-		control |= ATMEL_US_RTSDIS;
+		control |= rts_paused;
 
 	if (mctrl & TIOCM_DTR)
 		control |= ATMEL_US_DTREN;
@@ -359,23 +383,12 @@ static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
 	mctrl_gpio_set(atmel_port->gpios, mctrl);
 
 	/* Local loopback mode? */
-	mode = UART_GET_MR(port) & ~ATMEL_US_CHMODE;
+	mode &= ~ATMEL_US_CHMODE;
 	if (mctrl & TIOCM_LOOP)
 		mode |= ATMEL_US_CHMODE_LOC_LOOP;
 	else
 		mode |= ATMEL_US_CHMODE_NORMAL;
 
-	/* Resetting serial mode to RS232 (0x0) */
-	mode &= ~ATMEL_US_USMODE;
-
-	if (port->rs485.flags & SER_RS485_ENABLED) {
-		dev_dbg(port->dev, "Setting UART to RS485\n");
-		if ((port->rs485.delay_rts_after_send) > 0)
-			UART_PUT_TTGR(port, port->rs485.delay_rts_after_send);
-		mode |= ATMEL_US_USMODE_RS485;
-	} else {
-		dev_dbg(port->dev, "Setting UART to RS232\n");
-	}
 	UART_PUT_MR(port, mode);
 }
 
@@ -1921,12 +1934,14 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
 			      struct ktermios *old)
 {
 	unsigned long flags;
-	unsigned int mode, imr, quot, baud;
+	unsigned int old_mode, mode, imr, quot, baud;
+
+	/* save the current mode register */
+	mode = old_mode = UART_GET_MR(port);
 
-	/* Get current mode register */
-	mode = UART_GET_MR(port) & ~(ATMEL_US_USCLKS | ATMEL_US_CHRL
-					| ATMEL_US_NBSTOP | ATMEL_US_PAR
-					| ATMEL_US_USMODE);
+	/* reset the mode, clock divisor, parity, stop bits and data size */
+	mode &= ~(ATMEL_US_USCLKS | ATMEL_US_CHRL | ATMEL_US_NBSTOP |
+		  ATMEL_US_PAR | ATMEL_US_USMODE);
 
 	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
 	quot = uart_get_divisor(port, baud);
@@ -1971,12 +1986,6 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
 	} else
 		mode |= ATMEL_US_PAR_NONE;
 
-	/* hardware handshake (RTS/CTS) */
-	if (termios->c_cflag & CRTSCTS)
-		mode |= ATMEL_US_USMODE_HWHS;
-	else
-		mode |= ATMEL_US_USMODE_NORMAL;
-
 	spin_lock_irqsave(&port->lock, flags);
 
 	port->read_status_mask = ATMEL_US_OVRE;
@@ -2020,18 +2029,40 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
 	/* disable receiver and transmitter */
 	UART_PUT_CR(port, ATMEL_US_TXDIS | ATMEL_US_RXDIS);
 
-	/* Resetting serial mode to RS232 (0x0) */
-	mode &= ~ATMEL_US_USMODE;
-
+	/* mode */
 	if (port->rs485.flags & SER_RS485_ENABLED) {
 		if ((port->rs485.delay_rts_after_send) > 0)
 			UART_PUT_TTGR(port, port->rs485.delay_rts_after_send);
 		mode |= ATMEL_US_USMODE_RS485;
+	} else if (termios->c_cflag & CRTSCTS) {
+		/* RS232 with hardware handshake (RTS/CTS) */
+		mode |= ATMEL_US_USMODE_HWHS;
+	} else {
+		/* RS232 without hadware handshake */
+		mode |= ATMEL_US_USMODE_NORMAL;
 	}
 
-	/* set the parity, stop bits and data size */
+	/* set the mode, clock divisor, parity, stop bits and data size */
 	UART_PUT_MR(port, mode);
 
+	/*
+	 * when switching the mode, set the RTS line state according to the
+	 * new mode, otherwise keep the former state
+	 */
+	if ((old_mode & ATMEL_US_USMODE) != (mode & ATMEL_US_USMODE)) {
+		unsigned int rts_state;
+
+		if ((mode & ATMEL_US_USMODE) == ATMEL_US_USMODE_HWHS) {
+			/* let the hardware control the RTS line */
+			rts_state = ATMEL_US_RTSDIS;
+		} else {
+			/* force RTS line to low level */
+			rts_state = ATMEL_US_RTSEN;
+		}
+
+		UART_PUT_CR(port, rts_state);
+	}
+
 	/* set the baud rate */
 	UART_PUT_BRGR(port, quot);
 	UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
-- 
cgit v1.2.3-59-g8ed1b


From 1842dc2e29855ef2d8ec2e5ff9f29add7e999ce8 Mon Sep 17 00:00:00 2001
From: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Date: Tue, 9 Dec 2014 14:31:36 +0100
Subject: tty/serial: at91: fix typo and indentation

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/atmel_serial.c | 40 +++++++++++++++++++++------------------
 1 file changed, 22 insertions(+), 18 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 9e0c63676f0a..846552bff67d 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -738,7 +738,11 @@ static void atmel_complete_tx_dma(void *arg)
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(port);
 
-	/* Do we really need this? */
+	/*
+	 * xmit is a circular buffer so, if we have just send data from
+	 * xmit->tail to the end of xmit->buf, now we have to transmit the
+	 * remaining data from the beginning of xmit->buf to xmit->head.
+	 */
 	if (!uart_circ_empty(xmit))
 		tasklet_schedule(&atmel_port->tasklet);
 
@@ -797,11 +801,11 @@ static void atmel_tx_dma(struct uart_port *port)
 		BUG_ON(!sg_dma_len(sg));
 
 		desc = dmaengine_prep_slave_sg(chan,
-						sg,
-						1,
-						DMA_MEM_TO_DEV,
-						DMA_PREP_INTERRUPT |
-						DMA_CTRL_ACK);
+					       sg,
+					       1,
+					       DMA_MEM_TO_DEV,
+					       DMA_PREP_INTERRUPT |
+					       DMA_CTRL_ACK);
 		if (!desc) {
 			dev_err(port->dev, "Failed to send via dma!\n");
 			return;
@@ -1025,13 +1029,13 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
 	/* UART circular rx buffer is an aligned page. */
 	BUG_ON((int)port->state->xmit.buf & ~PAGE_MASK);
 	sg_set_page(&atmel_port->sg_rx,
-			virt_to_page(ring->buf),
-			ATMEL_SERIAL_RINGSIZE,
-			(int)ring->buf & ~PAGE_MASK);
-			nent = dma_map_sg(port->dev,
-					&atmel_port->sg_rx,
-					1,
-					DMA_FROM_DEVICE);
+		    virt_to_page(ring->buf),
+		    ATMEL_SERIAL_RINGSIZE,
+		    (int)ring->buf & ~PAGE_MASK);
+	nent = dma_map_sg(port->dev,
+			  &atmel_port->sg_rx,
+			  1,
+			  DMA_FROM_DEVICE);
 
 	if (!nent) {
 		dev_dbg(port->dev, "need to release resource of dma\n");
@@ -1060,11 +1064,11 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
 	 * each one is half ring buffer size
 	 */
 	desc = dmaengine_prep_dma_cyclic(atmel_port->chan_rx,
-				sg_dma_address(&atmel_port->sg_rx),
-				sg_dma_len(&atmel_port->sg_rx),
-				sg_dma_len(&atmel_port->sg_rx)/2,
-				DMA_DEV_TO_MEM,
-				DMA_PREP_INTERRUPT);
+					 sg_dma_address(&atmel_port->sg_rx),
+					 sg_dma_len(&atmel_port->sg_rx),
+					 sg_dma_len(&atmel_port->sg_rx)/2,
+					 DMA_DEV_TO_MEM,
+					 DMA_PREP_INTERRUPT);
 	desc->callback = atmel_complete_rx_dma;
 	desc->callback_param = port;
 	atmel_port->desc_rx = desc;
-- 
cgit v1.2.3-59-g8ed1b


From 55d8693acd65b1c14e011cbcbfad2a15626472cd Mon Sep 17 00:00:00 2001
From: Jiada Wang <jiada_wang@mentor.com>
Date: Tue, 9 Dec 2014 18:11:22 +0900
Subject: serial: imx: add CREAD flag support

Add CREAD flag hanlding in set_termios and UART DMA mode
which ignores all received chars when CREAD flag cleared.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Anton Bondarenko <anton_bondarenko@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 4c5e9092e2d7..eb2210fa972e 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -74,6 +74,7 @@
 #define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/
 
 /* UART Control Register Bit Fields.*/
+#define URXD_DUMMY_READ (1<<16)
 #define URXD_CHARRDY	(1<<15)
 #define URXD_ERR	(1<<14)
 #define URXD_OVRRUN	(1<<13)
@@ -710,6 +711,9 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
 #endif
 		}
 
+		if (sport->port.ignore_status_mask & URXD_DUMMY_READ)
+			goto out;
+
 		tty_insert_flip_char(port, rx, flg);
 	}
 
@@ -910,7 +914,8 @@ static void dma_rx_callback(void *data)
 	dev_dbg(sport->port.dev, "We get %d bytes.\n", count);
 
 	if (count) {
-		tty_insert_flip_string(port, sport->rx_buf, count);
+		if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ))
+			tty_insert_flip_string(port, sport->rx_buf, count);
 		tty_flip_buffer_push(port);
 
 		start_rx_dma(sport);
@@ -1330,6 +1335,9 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
 			sport->port.ignore_status_mask |= URXD_OVRRUN;
 	}
 
+	if ((termios->c_cflag & CREAD) == 0)
+		sport->port.ignore_status_mask |= URXD_DUMMY_READ;
+
 	/*
 	 * Update the per-port timeout.
 	 */
-- 
cgit v1.2.3-59-g8ed1b


From 73631813c1ed17437e9de86f82a477fa4bac90c1 Mon Sep 17 00:00:00 2001
From: Jiada Wang <jiada_wang@mentor.com>
Date: Tue, 9 Dec 2014 18:11:23 +0900
Subject: serial: imx: use locking to stop concurrent access of UCR1

Several places are accessing the UCR1 register without locking.
This probably will cause a race issue when another thread
is accessing the same register.
Add locking to preventing concurrent access of the UCR1 register.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index eb2210fa972e..c851247a27cb 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -731,6 +731,9 @@ static int start_rx_dma(struct imx_port *sport);
 static void imx_dma_rxint(struct imx_port *sport)
 {
 	unsigned long temp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sport->port.lock, flags);
 
 	temp = readl(sport->port.membase + USR2);
 	if ((temp & USR2_RDR) && !sport->dma_is_rxing) {
@@ -744,6 +747,8 @@ static void imx_dma_rxint(struct imx_port *sport)
 		/* tell the DMA to receive the data. */
 		start_rx_dma(sport);
 	}
+
+	spin_unlock_irqrestore(&sport->port.lock, flags);
 }
 
 static irqreturn_t imx_int(int irq, void *dev_id)
@@ -873,6 +878,9 @@ static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
 static void imx_rx_dma_done(struct imx_port *sport)
 {
 	unsigned long temp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sport->port.lock, flags);
 
 	/* Enable this interrupt when the RXFIFO is empty. */
 	temp = readl(sport->port.membase + UCR1);
@@ -884,6 +892,8 @@ static void imx_rx_dma_done(struct imx_port *sport)
 	/* Is the shutdown waiting for us? */
 	if (waitqueue_active(&sport->dma_wait))
 		wake_up(&sport->dma_wait);
+
+	spin_unlock_irqrestore(&sport->port.lock, flags);
 }
 
 /*
@@ -1194,9 +1204,11 @@ static void imx_shutdown(struct uart_port *port)
 			dmaengine_terminate_all(sport->dma_chan_tx);
 			dmaengine_terminate_all(sport->dma_chan_rx);
 		}
+		spin_lock_irqsave(&sport->port.lock, flags);
 		imx_stop_tx(port);
 		imx_stop_rx(port);
 		imx_disable_dma(sport);
+		spin_unlock_irqrestore(&sport->port.lock, flags);
 		imx_uart_dma_exit(sport);
 	}
 
-- 
cgit v1.2.3-59-g8ed1b


From 55c3cb1358e57280c54e3578afc76ce8190dd087 Mon Sep 17 00:00:00 2001
From: Dirk Behme <dirk.behme@de.bosch.com>
Date: Tue, 9 Dec 2014 18:11:24 +0900
Subject: serial: imx: remove unneeded imx_transmit_buffer() from
 imx_start_tx()

Use imx_start_tx() just to enable the TX interrupt. It's the job of the
TX interrupt ISR to fill the transmit buffer, then. If the transmit buffer
is empty, the TX interrupt should be executed as soon as the start_tx()
enables the interrupt, so there is no reason for the extra
imx_transmit_buffer() call, here. Remove it.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Andy Lowe <andy_lowe@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 3 ---
 1 file changed, 3 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index c851247a27cb..146663c100fd 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -621,9 +621,6 @@ static void imx_start_tx(struct uart_port *port)
 			imx_dma_tx(sport);
 		return;
 	}
-
-	if (readl(sport->port.membase + uts_reg(sport)) & UTS_TXEMPTY)
-		imx_transmit_buffer(sport);
 }
 
 static irqreturn_t imx_rtsint(int irq, void *dev_id)
-- 
cgit v1.2.3-59-g8ed1b


From 7942f8577f2a63b7a6b8cd70f5354a608b30fead Mon Sep 17 00:00:00 2001
From: Dirk Behme <dirk.behme@de.bosch.com>
Date: Tue, 9 Dec 2014 18:11:25 +0900
Subject: serial: imx: TX DMA: clean up sg initialization

Inverting the logic of the if statement for the sg initialization
makes the if statement easier and better to read.

No functional change.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 146663c100fd..5cea7d257426 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -539,15 +539,15 @@ static void imx_dma_tx(struct imx_port *sport)
 
 	sport->tx_bytes = uart_circ_chars_pending(xmit);
 
-	if (xmit->tail > xmit->head && xmit->head > 0) {
+	if (xmit->tail < xmit->head) {
+		sport->dma_tx_nents = 1;
+		sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes);
+	} else {
 		sport->dma_tx_nents = 2;
 		sg_init_table(sgl, 2);
 		sg_set_buf(sgl, xmit->buf + xmit->tail,
 				UART_XMIT_SIZE - xmit->tail);
 		sg_set_buf(sgl + 1, xmit->buf, xmit->head);
-	} else {
-		sport->dma_tx_nents = 1;
-		sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes);
 	}
 
 	ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
-- 
cgit v1.2.3-59-g8ed1b


From 2464982174a1886b56b445b0503b331008a626fe Mon Sep 17 00:00:00 2001
From: Dirk Behme <dirk.behme@de.bosch.com>
Date: Tue, 9 Dec 2014 18:11:26 +0900
Subject: serial: imx: unmap sg in case of dmaengine_prep_slave_sg() failure

In case dmaengine_prep_slave_sg() fails, add the missing dma_unmap_sg().

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Anton Bondarenko <anton_bondarenko@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 5cea7d257426..b4cf24c64a15 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -558,6 +558,8 @@ static void imx_dma_tx(struct imx_port *sport)
 	desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents,
 					DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
 	if (!desc) {
+		dma_unmap_sg(dev, sgl, sport->dma_tx_nents,
+			     DMA_TO_DEVICE);
 		dev_err(dev, "We cannot prepare for the TX slave dma!\n");
 		return;
 	}
@@ -947,6 +949,7 @@ static int start_rx_dma(struct imx_port *sport)
 	desc = dmaengine_prep_slave_sg(chan, sgl, 1, DMA_DEV_TO_MEM,
 					DMA_PREP_INTERRUPT);
 	if (!desc) {
+		dma_unmap_sg(dev, sgl, 1, DMA_FROM_DEVICE);
 		dev_err(dev, "We cannot prepare for the RX slave dma!\n");
 		return -EINVAL;
 	}
-- 
cgit v1.2.3-59-g8ed1b


From 82e86ae941194e6b6278ff67aad257b018e0684f Mon Sep 17 00:00:00 2001
From: Dirk Behme <dirk.behme@de.bosch.com>
Date: Tue, 9 Dec 2014 18:11:27 +0900
Subject: serial: imx: unmap scatter gather list in imx_flush_buffer

First, reformat the code to exit immediately. This allows us to add
more code in more readable format.

In case the TX DMA was still running, remove and disable it's resources.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index b4cf24c64a15..952730ab9067 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1250,10 +1250,17 @@ static void imx_shutdown(struct uart_port *port)
 static void imx_flush_buffer(struct uart_port *port)
 {
 	struct imx_port *sport = (struct imx_port *)port;
+	struct scatterlist *sgl = &sport->tx_sgl[0];
 
-	if (sport->dma_is_enabled) {
-		sport->tx_bytes = 0;
-		dmaengine_terminate_all(sport->dma_chan_tx);
+	if (!sport->dma_chan_tx)
+		return;
+
+	sport->tx_bytes = 0;
+	dmaengine_terminate_all(sport->dma_chan_tx);
+	if (sport->dma_is_txing) {
+		dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents,
+			     DMA_TO_DEVICE);
+		sport->dma_is_txing = false;
 	}
 }
 
-- 
cgit v1.2.3-59-g8ed1b


From 42f752b3fbcfee9c27e4f6f6216e60e130ba98c8 Mon Sep 17 00:00:00 2001
From: Dirk Behme <dirk.behme@de.bosch.com>
Date: Tue, 9 Dec 2014 18:11:28 +0900
Subject: serial: imx: use dma_is_txing to synchronize dma_tx_callback and
 imx_dma_tx

To synchronize between dma_tx_callback() and imx_dma_tx() use the same
variable, dma_is_txing. This prevents any race between these two functions
and ensures that a new DMA can start only after the first has been
finished.

Before the new DMA can be set up, update the circular buffer logic, first.
Therefore, change dma_is_txing after that update, instead of before.

While doing this, in dma_tx_callback() extend the locking to dma_unmap_sg()
and the update of dma_is_txing.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 952730ab9067..1c4f367b6fb6 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -502,18 +502,20 @@ static void dma_tx_callback(void *data)
 	struct circ_buf *xmit = &sport->port.state->xmit;
 	unsigned long flags;
 
-	dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
+	spin_lock_irqsave(&sport->port.lock, flags);
 
-	sport->dma_is_txing = 0;
+	dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
 
 	/* update the stat */
-	spin_lock_irqsave(&sport->port.lock, flags);
 	xmit->tail = (xmit->tail + sport->tx_bytes) & (UART_XMIT_SIZE - 1);
 	sport->port.icount.tx += sport->tx_bytes;
-	spin_unlock_irqrestore(&sport->port.lock, flags);
 
 	dev_dbg(sport->port.dev, "we finish the TX DMA.\n");
 
+	sport->dma_is_txing = 0;
+
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+
 	uart_write_wakeup(&sport->port);
 
 	if (waitqueue_active(&sport->dma_wait)) {
@@ -530,11 +532,9 @@ static void imx_dma_tx(struct imx_port *sport)
 	struct dma_async_tx_descriptor *desc;
 	struct dma_chan	*chan = sport->dma_chan_tx;
 	struct device *dev = sport->port.dev;
-	enum dma_status status;
 	int ret;
 
-	status = dmaengine_tx_status(chan, (dma_cookie_t)0, NULL);
-	if (DMA_IN_PROGRESS == status)
+	if (sport->dma_is_txing)
 		return;
 
 	sport->tx_bytes = uart_circ_chars_pending(xmit);
-- 
cgit v1.2.3-59-g8ed1b


From d64b8607aceb9bd3b3dabddfc4f76458e5a8489d Mon Sep 17 00:00:00 2001
From: Jiada Wang <jiada_wang@mentor.com>
Date: Tue, 9 Dec 2014 18:11:29 +0900
Subject: Revert "serial: imx: always wake up the processes in the TX callback"

This reverts commit 2ad28e3efee21a5bbf940c83d1f0395b76bd3efb.

Instead of always wake up write_wait process in TX callback,
TX callback should call imx_dma_tx() again, and let imx_dma_tx
transfer the remaining data in circle buffer.

The issue with commit 2ad28e3 is, in case there is remaining
data in circle buffer, but no process is waiting on write_wait
queue, then as no following uart_write() will be called after
uart_write_wakeup(), thus cause data loss.

Moreover according to Documentation/serial/driver, uart_write_wakeup()
should be called in case the transmit buffer have dropped below
a threshold.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 1c4f367b6fb6..73158d96822a 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -516,7 +516,8 @@ static void dma_tx_callback(void *data)
 
 	spin_unlock_irqrestore(&sport->port.lock, flags);
 
-	uart_write_wakeup(&sport->port);
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(&sport->port);
 
 	if (waitqueue_active(&sport->dma_wait)) {
 		wake_up(&sport->dma_wait);
-- 
cgit v1.2.3-59-g8ed1b


From 0bbc9b81c1638f6e75c8ed423b5e6ae1a2035d79 Mon Sep 17 00:00:00 2001
From: Jiada Wang <jiada_wang@mentor.com>
Date: Tue, 9 Dec 2014 18:11:30 +0900
Subject: serial: imx: call imx_dma_tx() again in dma_tx_callback

Currently in dma_tx_callback(), no matter if there is still
remaining data pending in circle buffer or not, DMA transmit
will be terminated.

This will result in some data never get transmitted.
In order to fix this issue, call imx_dma_tx() again in
dma_tx_callback, when there is pending data and uart hasn't
been stopped.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 73158d96822a..0e64f18f8c42 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -495,6 +495,7 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
 		imx_stop_tx(&sport->port);
 }
 
+static void imx_dma_tx(struct imx_port *sport);
 static void dma_tx_callback(void *data)
 {
 	struct imx_port *sport = data;
@@ -524,6 +525,11 @@ static void dma_tx_callback(void *data)
 		dev_dbg(sport->port.dev, "exit in %s.\n", __func__);
 		return;
 	}
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+	if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port))
+		imx_dma_tx(sport);
+	spin_unlock_irqrestore(&sport->port.lock, flags);
 }
 
 static void imx_dma_tx(struct imx_port *sport)
-- 
cgit v1.2.3-59-g8ed1b


From a2c718ce6a61f759fc47d632bcc3d8cf6b244581 Mon Sep 17 00:00:00 2001
From: Dirk Behme <dirk.behme@de.bosch.com>
Date: Tue, 9 Dec 2014 18:11:31 +0900
Subject: serial: imx: disable TDMAEN in imx_flush_buffer()

Terminating the DMA, make sure the interrupt is disabled, too.
This fixes random kernel Oops due to dma_tx_call() called for
invalid transmissions.

If we disable the TDMAEN, make sure it's enabled again if a TX
DMA is started.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 0e64f18f8c42..d097169e85d1 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -502,11 +502,16 @@ static void dma_tx_callback(void *data)
 	struct scatterlist *sgl = &sport->tx_sgl[0];
 	struct circ_buf *xmit = &sport->port.state->xmit;
 	unsigned long flags;
+	unsigned long temp;
 
 	spin_lock_irqsave(&sport->port.lock, flags);
 
 	dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
 
+	temp = readl(sport->port.membase + UCR1);
+	temp &= ~UCR1_TDMAEN;
+	writel(temp, sport->port.membase + UCR1);
+
 	/* update the stat */
 	xmit->tail = (xmit->tail + sport->tx_bytes) & (UART_XMIT_SIZE - 1);
 	sport->port.icount.tx += sport->tx_bytes;
@@ -539,6 +544,7 @@ static void imx_dma_tx(struct imx_port *sport)
 	struct dma_async_tx_descriptor *desc;
 	struct dma_chan	*chan = sport->dma_chan_tx;
 	struct device *dev = sport->port.dev;
+	unsigned long temp;
 	int ret;
 
 	if (sport->dma_is_txing)
@@ -575,6 +581,11 @@ static void imx_dma_tx(struct imx_port *sport)
 
 	dev_dbg(dev, "TX: prepare to send %lu bytes by DMA.\n",
 			uart_circ_chars_pending(xmit));
+
+	temp = readl(sport->port.membase + UCR1);
+	temp |= UCR1_TDMAEN;
+	writel(temp, sport->port.membase + UCR1);
+
 	/* fire it */
 	sport->dma_is_txing = 1;
 	dmaengine_submit(desc);
@@ -1258,6 +1269,7 @@ static void imx_flush_buffer(struct uart_port *port)
 {
 	struct imx_port *sport = (struct imx_port *)port;
 	struct scatterlist *sgl = &sport->tx_sgl[0];
+	unsigned long temp;
 
 	if (!sport->dma_chan_tx)
 		return;
@@ -1267,6 +1279,9 @@ static void imx_flush_buffer(struct uart_port *port)
 	if (sport->dma_is_txing) {
 		dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents,
 			     DMA_TO_DEVICE);
+		temp = readl(sport->port.membase + UCR1);
+		temp &= ~UCR1_TDMAEN;
+		writel(temp, sport->port.membase + UCR1);
 		sport->dma_is_txing = false;
 	}
 }
-- 
cgit v1.2.3-59-g8ed1b


From 068500e08dc87ea9a453cc4a500cf3ab28d0f936 Mon Sep 17 00:00:00 2001
From: Anton Bondarenko <anton_bondarenko@mentor.com>
Date: Tue, 9 Dec 2014 18:11:32 +0900
Subject: serial: imx: initialized DMA w/o HW flow enabled

DMA mode for UART can be used even w/o HW flow control with RTS/CTS.
So it need to be initialized and enabled earlier.

Signed-off-by: Anton Bondarenko <anton_bondarenko@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index d097169e85d1..ab958a59cae9 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1141,12 +1141,20 @@ static int imx_startup(struct uart_port *port)
 	while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0))
 		udelay(1);
 
+	/* Can we enable the DMA support? */
+	if (is_imx6q_uart(sport) && !uart_console(port) &&
+	    !sport->dma_is_inited)
+		imx_uart_dma_init(sport);
+
 	spin_lock_irqsave(&sport->port.lock, flags);
 	/*
 	 * Finally, clear and enable interrupts
 	 */
 	writel(USR1_RTSD, sport->port.membase + USR1);
 
+	if (sport->dma_is_inited && !sport->dma_is_enabled)
+		imx_enable_dma(sport);
+
 	temp = readl(sport->port.membase + UCR1);
 	temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN;
 
@@ -1326,11 +1334,6 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
 		if (sport->have_rtscts) {
 			ucr2 &= ~UCR2_IRTS;
 			ucr2 |= UCR2_CTSC;
-
-			/* Can we enable the DMA support? */
-			if (is_imx6q_uart(sport) && !uart_console(port)
-				&& !sport->dma_is_inited)
-				imx_uart_dma_init(sport);
 		} else {
 			termios->c_cflag &= ~CRTSCTS;
 		}
@@ -1452,8 +1455,6 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
 	if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
 		imx_enable_ms(&sport->port);
 
-	if (sport->dma_is_inited && !sport->dma_is_enabled)
-		imx_enable_dma(sport);
 	spin_unlock_irqrestore(&sport->port.lock, flags);
 }
 
-- 
cgit v1.2.3-59-g8ed1b


From ee5e7c1091a703c6a465d8145e9b55e09adb6f37 Mon Sep 17 00:00:00 2001
From: Robin Gong <b38343@freescale.com>
Date: Tue, 9 Dec 2014 18:11:33 +0900
Subject: serial: imx: start rx_dma once RXFIFO is not empty

Start rx_dma once RXFIFO is not empty that can avoid dma request lost
and causes data delay issue.

Signed-off-by: Robin Gong <b38343@freescale.com>
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index ab958a59cae9..d61b89e4a96e 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -946,8 +946,21 @@ static void dma_rx_callback(void *data)
 		tty_flip_buffer_push(port);
 
 		start_rx_dma(sport);
-	} else
+	} else if (readl(sport->port.membase + USR2) & USR2_RDR) {
+		/*
+		 * start rx_dma directly once data in RXFIFO, more efficient
+		 * than before:
+		 *	1. call imx_rx_dma_done to stop dma if no data received
+		 *	2. wait next  RDR interrupt to start dma transfer.
+		 */
+		start_rx_dma(sport);
+	} else {
+		/*
+		 * stop dma to prevent too many IDLE event trigged if no data
+		 * in RXFIFO
+		 */
 		imx_rx_dma_done(sport);
+	}
 }
 
 static int start_rx_dma(struct imx_port *sport)
-- 
cgit v1.2.3-59-g8ed1b


From 6f026d6b7cb6e019b6352ed7fb71497c787fd6d7 Mon Sep 17 00:00:00 2001
From: Jiada Wang <jiada_wang@mentor.com>
Date: Tue, 9 Dec 2014 18:11:34 +0900
Subject: serial: imx: Enable UCR4_OREN in startup interface

Other than enable Receiver Overrun Interrupt Enable (UCR4_OREN)
in start_tx interface, UCR4_OREN should be enabled before enable
of Receiver.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index d61b89e4a96e..79f485b99c3f 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -611,13 +611,6 @@ static void imx_start_tx(struct uart_port *port)
 		temp &= ~(UCR1_RRDYEN);
 		writel(temp, sport->port.membase + UCR1);
 	}
-	/* Clear any pending ORE flag before enabling interrupt */
-	temp = readl(sport->port.membase + USR2);
-	writel(temp | USR2_ORE, sport->port.membase + USR2);
-
-	temp = readl(sport->port.membase + UCR4);
-	temp |= UCR4_OREN;
-	writel(temp, sport->port.membase + UCR4);
 
 	if (!sport->dma_is_enabled) {
 		temp = readl(sport->port.membase + UCR1);
@@ -1178,6 +1171,14 @@ static int imx_startup(struct uart_port *port)
 
 	writel(temp, sport->port.membase + UCR1);
 
+	/* Clear any pending ORE flag before enabling interrupt */
+	temp = readl(sport->port.membase + USR2);
+	writel(temp | USR2_ORE, sport->port.membase + USR2);
+
+	temp = readl(sport->port.membase + UCR4);
+	temp |= UCR4_OREN;
+	writel(temp, sport->port.membase + UCR4);
+
 	temp = readl(sport->port.membase + UCR2);
 	temp |= (UCR2_RXEN | UCR2_TXEN);
 	if (!sport->have_rtscts)
-- 
cgit v1.2.3-59-g8ed1b


From 7e2fb5aa8d819e8cc0b6815ad627b7e911fabfd9 Mon Sep 17 00:00:00 2001
From: Jiada Wang <jiada_wang@mentor.com>
Date: Tue, 9 Dec 2014 18:11:35 +0900
Subject: serial: imx: Fix issue in software flow control

After send out x_char in UART driver, x_char needs to be cleared
by UART driver itself, otherwise data in TXFIFO can no longer be
sent out.
Also tx counter needs to be increased to keep track of correct
number of transmitted data.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 79f485b99c3f..5a7da019f01a 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -471,6 +471,8 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
 	if (sport->port.x_char) {
 		/* Send next char */
 		writel(sport->port.x_char, sport->port.membase + URTX0);
+		sport->port.icount.tx++;
+		sport->port.x_char = 0;
 		return;
 	}
 
-- 
cgit v1.2.3-59-g8ed1b


From 91a1a909f9217abb16c5bb3ec2ae606a9fc085e8 Mon Sep 17 00:00:00 2001
From: Jiada Wang <jiada_wang@mentor.com>
Date: Tue, 9 Dec 2014 18:11:36 +0900
Subject: serial: imx: Support sw flow control in DMA mode

This patch adds Software flow control support in DMA mode.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 5a7da019f01a..72b800b296b1 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -464,9 +464,11 @@ static void imx_enable_ms(struct uart_port *port)
 	mod_timer(&sport->timer, jiffies);
 }
 
+static void imx_dma_tx(struct imx_port *sport);
 static inline void imx_transmit_buffer(struct imx_port *sport)
 {
 	struct circ_buf *xmit = &sport->port.state->xmit;
+	unsigned long temp;
 
 	if (sport->port.x_char) {
 		/* Send next char */
@@ -481,6 +483,22 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
 		return;
 	}
 
+	if (sport->dma_is_enabled) {
+		/*
+		 * We've just sent a X-char Ensure the TX DMA is enabled
+		 * and the TX IRQ is disabled.
+		 **/
+		temp = readl(sport->port.membase + UCR1);
+		temp &= ~UCR1_TXMPTYEN;
+		if (sport->dma_is_txing) {
+			temp |= UCR1_TDMAEN;
+			writel(temp, sport->port.membase + UCR1);
+		} else {
+			writel(temp, sport->port.membase + UCR1);
+			imx_dma_tx(sport);
+		}
+	}
+
 	while (!uart_circ_empty(xmit) &&
 	       !(readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL)) {
 		/* send xmit->buf[xmit->tail]
@@ -497,7 +515,6 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
 		imx_stop_tx(&sport->port);
 }
 
-static void imx_dma_tx(struct imx_port *sport);
 static void dma_tx_callback(void *data)
 {
 	struct imx_port *sport = data;
@@ -630,7 +647,16 @@ static void imx_start_tx(struct uart_port *port)
 	}
 
 	if (sport->dma_is_enabled) {
-		/* FIXME: port->x_char must be transmitted if != 0 */
+		if (sport->port.x_char) {
+			/* We have X-char to send, so enable TX IRQ and
+			 * disable TX DMA to let TX interrupt to send X-char */
+			temp = readl(sport->port.membase + UCR1);
+			temp &= ~UCR1_TDMAEN;
+			temp |= UCR1_TXMPTYEN;
+			writel(temp, sport->port.membase + UCR1);
+			return;
+		}
+
 		if (!uart_circ_empty(&port->state->xmit) &&
 		    !uart_tx_stopped(port))
 			imx_dma_tx(sport);
-- 
cgit v1.2.3-59-g8ed1b


From 7bb6b2f65e6ce9743df42fabbf124e4ef9dc226b Mon Sep 17 00:00:00 2001
From: Robert Baldyga <r.baldyga@samsung.com>
Date: Wed, 10 Dec 2014 12:49:22 +0100
Subject: serial: samsung: add struct s3c24xx_uart_dma

This struct contains DMA configuration for each serial port.
It will be used in next commits adding DMA support in driver.

Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/samsung.h | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h
index eb071dd19b2d..8dc250c6b472 100644
--- a/drivers/tty/serial/samsung.h
+++ b/drivers/tty/serial/samsung.h
@@ -12,6 +12,8 @@
  * published by the Free Software Foundation.
 */
 
+#include <linux/dmaengine.h>
+
 struct s3c24xx_uart_info {
 	char			*name;
 	unsigned int		type;
@@ -41,6 +43,40 @@ struct s3c24xx_serial_drv_data {
 	unsigned int			fifosize[CONFIG_SERIAL_SAMSUNG_UARTS];
 };
 
+struct s3c24xx_uart_dma {
+	dma_filter_fn			fn;
+	void				*rx_param;
+	void				*tx_param;
+
+	unsigned int			rx_chan_id;
+	unsigned int			tx_chan_id;
+
+	struct dma_slave_config		rx_conf;
+	struct dma_slave_config		tx_conf;
+
+	struct dma_chan			*rx_chan;
+	struct dma_chan			*tx_chan;
+
+	dma_addr_t			rx_addr;
+	dma_addr_t			tx_addr;
+
+	dma_cookie_t			rx_cookie;
+	dma_cookie_t			tx_cookie;
+
+	char				*rx_buf;
+
+	dma_addr_t			tx_transfer_addr;
+
+	size_t				rx_size;
+	size_t				tx_size;
+
+	struct dma_async_tx_descriptor	*tx_desc;
+	struct dma_async_tx_descriptor	*rx_desc;
+
+	int				tx_bytes_requested;
+	int				rx_bytes_requested;
+};
+
 struct s3c24xx_uart_port {
 	unsigned char			rx_claimed;
 	unsigned char			tx_claimed;
@@ -59,6 +95,8 @@ struct s3c24xx_uart_port {
 	/* reference to platform data */
 	struct s3c2410_uartcfg		*cfg;
 
+	struct s3c24xx_uart_dma		*dma;
+
 #ifdef CONFIG_CPU_FREQ
 	struct notifier_block		freq_transition;
 #endif
-- 
cgit v1.2.3-59-g8ed1b


From 658c9d2b735fbc066a6608754b0eda77c92e637b Mon Sep 17 00:00:00 2001
From: Robert Baldyga <r.baldyga@samsung.com>
Date: Wed, 10 Dec 2014 12:49:23 +0100
Subject: serial: samsung: alloc dma stucture in ourport

When we have "dmas" property in serial node in device-tree, we do
memory alocation for dma structure which will be used in DMA handling
code.

Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/samsung.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 19273e31d224..7196a3e586cf 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -1209,6 +1209,18 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 	ret = platform_get_irq(platdev, 1);
 	if (ret > 0)
 		ourport->tx_irq = ret;
+	/*
+	 * DMA is currently supported only on DT platforms, if DMA properties
+	 * are specified.
+	 */
+	if (platdev->dev.of_node && of_find_property(platdev->dev.of_node,
+						     "dmas", NULL)) {
+		ourport->dma = devm_kzalloc(port->dev,
+					    sizeof(*ourport->dma),
+					    GFP_KERNEL);
+		if (!ourport->dma)
+			return -ENOMEM;
+	}
 
 	ourport->clk	= clk_get(&platdev->dev, "uart");
 	if (IS_ERR(ourport->clk)) {
-- 
cgit v1.2.3-59-g8ed1b


From 62c37eedb74c8fbf3c92f8f28a871e6bd80c181a Mon Sep 17 00:00:00 2001
From: Robert Baldyga <r.baldyga@samsung.com>
Date: Wed, 10 Dec 2014 12:49:25 +0100
Subject: serial: samsung: add dma reqest/release functions

Add functions requesting and releasing RX and TX DMA channels. This
function are called only when "dmas" property in serial device-tree
node is defined.

Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/samsung.c | 101 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 7196a3e586cf..825c8192b944 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -28,6 +28,9 @@
 #define SUPPORT_SYSRQ
 #endif
 
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/ioport.h>
 #include <linux/io.h>
@@ -453,6 +456,93 @@ static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
 	spin_unlock_irqrestore(&port->lock, flags);
 }
 
+static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
+{
+	struct s3c24xx_uart_dma	*dma = p->dma;
+	dma_cap_mask_t mask;
+	unsigned long flags;
+
+	/* Default slave configuration parameters */
+	dma->rx_conf.direction		= DMA_DEV_TO_MEM;
+	dma->rx_conf.src_addr_width	= DMA_SLAVE_BUSWIDTH_1_BYTE;
+	dma->rx_conf.src_addr		= p->port.mapbase + S3C2410_URXH;
+	dma->rx_conf.src_maxburst	= 16;
+
+	dma->tx_conf.direction		= DMA_MEM_TO_DEV;
+	dma->tx_conf.dst_addr_width	= DMA_SLAVE_BUSWIDTH_1_BYTE;
+	dma->tx_conf.dst_addr		= p->port.mapbase + S3C2410_UTXH;
+	if (dma_get_cache_alignment() >= 16)
+		dma->tx_conf.dst_maxburst = 16;
+	else
+		dma->tx_conf.dst_maxburst = 1;
+
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_SLAVE, mask);
+
+	dma->rx_chan = dma_request_slave_channel_compat(mask, dma->fn,
+					dma->rx_param, p->port.dev, "rx");
+	if (!dma->rx_chan)
+		return -ENODEV;
+
+	dmaengine_slave_config(dma->rx_chan, &dma->rx_conf);
+
+	dma->tx_chan = dma_request_slave_channel_compat(mask, dma->fn,
+					dma->tx_param, p->port.dev, "tx");
+	if (!dma->tx_chan) {
+		dma_release_channel(dma->rx_chan);
+		return -ENODEV;
+	}
+
+	dmaengine_slave_config(dma->tx_chan, &dma->tx_conf);
+
+	/* RX buffer */
+	dma->rx_size = PAGE_SIZE;
+
+	dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL);
+
+	if (!dma->rx_buf) {
+		dma_release_channel(dma->rx_chan);
+		dma_release_channel(dma->tx_chan);
+		return -ENOMEM;
+	}
+
+	dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf,
+				dma->rx_size, DMA_FROM_DEVICE);
+
+	spin_lock_irqsave(&p->port.lock, flags);
+
+	/* TX buffer */
+	dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
+				p->port.state->xmit.buf,
+				UART_XMIT_SIZE, DMA_TO_DEVICE);
+
+	spin_unlock_irqrestore(&p->port.lock, flags);
+
+	return 0;
+}
+
+static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
+{
+	struct s3c24xx_uart_dma	*dma = p->dma;
+
+	if (dma->rx_chan) {
+		dmaengine_terminate_all(dma->rx_chan);
+		dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
+				dma->rx_size, DMA_FROM_DEVICE);
+		kfree(dma->rx_buf);
+		dma_release_channel(dma->rx_chan);
+		dma->rx_chan = NULL;
+	}
+
+	if (dma->tx_chan) {
+		dmaengine_terminate_all(dma->tx_chan);
+		dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr,
+				UART_XMIT_SIZE, DMA_TO_DEVICE);
+		dma_release_channel(dma->tx_chan);
+		dma->tx_chan = NULL;
+	}
+}
+
 static void s3c24xx_serial_shutdown(struct uart_port *port)
 {
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
@@ -478,6 +568,10 @@ static void s3c24xx_serial_shutdown(struct uart_port *port)
 		wr_regl(port, S3C64XX_UINTP, 0xf);
 		wr_regl(port, S3C64XX_UINTM, 0xf);
 	}
+
+	if (ourport->dma)
+		s3c24xx_serial_release_dma(ourport);
+
 }
 
 static int s3c24xx_serial_startup(struct uart_port *port)
@@ -535,6 +629,13 @@ static int s3c64xx_serial_startup(struct uart_port *port)
 	    port, (unsigned long long)port->mapbase, port->membase);
 
 	wr_regl(port, S3C64XX_UINTM, 0xf);
+	if (ourport->dma) {
+		ret = s3c24xx_serial_request_dma(ourport);
+		if (ret < 0) {
+			dev_warn(port->dev, "DMA request failed\n");
+			return ret;
+		}
+	}
 
 	ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
 			  s3c24xx_serial_portname(port), ourport);
-- 
cgit v1.2.3-59-g8ed1b


From 29bef79908459d20a7a3db654bceb8f3ce4601dc Mon Sep 17 00:00:00 2001
From: Robert Baldyga <r.baldyga@samsung.com>
Date: Wed, 10 Dec 2014 12:49:26 +0100
Subject: serial: samsung: add DMA support for TX

Add TX DMA transfers support for samsung serial driver. It's enabled
when "dmas" property is defined in serial device-tree node, otherwise
TX transfers are prerformed using PIO.

TX DMA is used for data segments larger than fifosize to reduce number
of interrupts during data transmission. For buffers shorter than fifosize
PIO mode is selected.

Data blocks for DMA transfers are aligned to cache line size to avoid
problems with coherency (some areas of TX circ buffer can be used by
CPU during DMA transaction, so we have to ensure that our data is always
consistent).

Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/samsung.c | 238 ++++++++++++++++++++++++++++++++++++++++---
 drivers/tty/serial/samsung.h |   3 +
 2 files changed, 225 insertions(+), 16 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 825c8192b944..c04618052e53 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -81,6 +81,8 @@ static void dbg(const char *fmt, ...)
 #define S3C24XX_SERIAL_MAJOR	204
 #define S3C24XX_SERIAL_MINOR	64
 
+#define S3C24XX_TX_PIO			1
+#define S3C24XX_TX_DMA			2
 /* macros to change one thing to another */
 
 #define tx_enabled(port) ((port)->unused[0])
@@ -157,33 +159,217 @@ static void s3c24xx_serial_rx_disable(struct uart_port *port)
 static void s3c24xx_serial_stop_tx(struct uart_port *port)
 {
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
+	struct s3c24xx_uart_dma *dma = ourport->dma;
+	struct circ_buf *xmit = &port->state->xmit;
+	struct dma_tx_state state;
+	int count;
 
-	if (tx_enabled(port)) {
-		if (s3c24xx_serial_has_interrupt_mask(port))
-			__set_bit(S3C64XX_UINTM_TXD,
-				portaddrl(port, S3C64XX_UINTM));
-		else
-			disable_irq_nosync(ourport->tx_irq);
-		tx_enabled(port) = 0;
-		if (port->flags & UPF_CONS_FLOW)
-			s3c24xx_serial_rx_enable(port);
+	if (!tx_enabled(port))
+		return;
+
+	if (s3c24xx_serial_has_interrupt_mask(port))
+		__set_bit(S3C64XX_UINTM_TXD,
+			portaddrl(port, S3C64XX_UINTM));
+	else
+		disable_irq_nosync(ourport->tx_irq);
+
+	if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) {
+		dmaengine_pause(dma->tx_chan);
+		dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
+		dmaengine_terminate_all(dma->tx_chan);
+		dma_sync_single_for_cpu(ourport->port.dev,
+			dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE);
+		async_tx_ack(dma->tx_desc);
+		count = dma->tx_bytes_requested - state.residue;
+		xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
+		port->icount.tx += count;
 	}
+
+	tx_enabled(port) = 0;
+	ourport->tx_in_progress = 0;
+
+	if (port->flags & UPF_CONS_FLOW)
+		s3c24xx_serial_rx_enable(port);
+
+	ourport->tx_mode = 0;
+}
+
+static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
+
+static void s3c24xx_serial_tx_dma_complete(void *args)
+{
+	struct s3c24xx_uart_port *ourport = args;
+	struct uart_port *port = &ourport->port;
+	struct circ_buf *xmit = &port->state->xmit;
+	struct s3c24xx_uart_dma *dma = ourport->dma;
+	struct dma_tx_state state;
+	unsigned long flags;
+	int count;
+
+
+	dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
+	count = dma->tx_bytes_requested - state.residue;
+	async_tx_ack(dma->tx_desc);
+
+	dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr,
+				dma->tx_size, DMA_TO_DEVICE);
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
+	port->icount.tx += count;
+	ourport->tx_in_progress = 0;
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
+	s3c24xx_serial_start_next_tx(ourport);
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
+{
+	struct uart_port *port = &ourport->port;
+	u32 ucon;
+
+	/* Mask Tx interrupt */
+	if (s3c24xx_serial_has_interrupt_mask(port))
+		__set_bit(S3C64XX_UINTM_TXD,
+			  portaddrl(port, S3C64XX_UINTM));
+	else
+		disable_irq_nosync(ourport->tx_irq);
+
+	/* Enable tx dma mode */
+	ucon = rd_regl(port, S3C2410_UCON);
+	ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
+	ucon |= (dma_get_cache_alignment() >= 16) ?
+		S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
+	ucon |= S3C64XX_UCON_TXMODE_DMA;
+	wr_regl(port,  S3C2410_UCON, ucon);
+
+	ourport->tx_mode = S3C24XX_TX_DMA;
+}
+
+static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
+{
+	struct uart_port *port = &ourport->port;
+	u32 ucon, ufcon;
+
+	/* Set ufcon txtrig */
+	ourport->tx_in_progress = S3C24XX_TX_PIO;
+	ufcon = rd_regl(port, S3C2410_UFCON);
+	wr_regl(port,  S3C2410_UFCON, ufcon);
+
+	/* Enable tx pio mode */
+	ucon = rd_regl(port, S3C2410_UCON);
+	ucon &= ~(S3C64XX_UCON_TXMODE_MASK);
+	ucon |= S3C64XX_UCON_TXMODE_CPU;
+	wr_regl(port,  S3C2410_UCON, ucon);
+
+	/* Unmask Tx interrupt */
+	if (s3c24xx_serial_has_interrupt_mask(port))
+		__clear_bit(S3C64XX_UINTM_TXD,
+			    portaddrl(port, S3C64XX_UINTM));
+	else
+		enable_irq(ourport->tx_irq);
+
+	ourport->tx_mode = S3C24XX_TX_PIO;
 }
 
-static void s3c24xx_serial_start_tx(struct uart_port *port)
+static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
+{
+	if (ourport->tx_mode != S3C24XX_TX_PIO)
+		enable_tx_pio(ourport);
+}
+
+static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
+				      unsigned int count)
+{
+	struct uart_port *port = &ourport->port;
+	struct circ_buf *xmit = &port->state->xmit;
+	struct s3c24xx_uart_dma *dma = ourport->dma;
+
+
+	if (ourport->tx_mode != S3C24XX_TX_DMA)
+		enable_tx_dma(ourport);
+
+	while (xmit->tail & (dma_get_cache_alignment() - 1)) {
+		if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
+			return 0;
+		wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		port->icount.tx++;
+		count--;
+	}
+
+	dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
+	dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
+
+	dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
+				dma->tx_size, DMA_TO_DEVICE);
+
+	dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
+				dma->tx_transfer_addr, dma->tx_size,
+				DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
+	if (!dma->tx_desc) {
+		dev_err(ourport->port.dev, "Unable to get desc for Tx\n");
+		return -EIO;
+	}
+
+	dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete;
+	dma->tx_desc->callback_param = ourport;
+	dma->tx_bytes_requested = dma->tx_size;
+
+	ourport->tx_in_progress = S3C24XX_TX_DMA;
+	dma->tx_cookie = dmaengine_submit(dma->tx_desc);
+	dma_async_issue_pending(dma->tx_chan);
+	return 0;
+}
+
+static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
+{
+	struct uart_port *port = &ourport->port;
+	struct circ_buf *xmit = &port->state->xmit;
+	unsigned long count;
+
+	/* Get data size up to the end of buffer */
+	count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+
+	if (!count) {
+		s3c24xx_serial_stop_tx(port);
+		return;
+	}
+
+	if (!ourport->dma || !ourport->dma->tx_chan || count < port->fifosize)
+		s3c24xx_serial_start_tx_pio(ourport);
+	else
+		s3c24xx_serial_start_tx_dma(ourport, count);
+}
+
+void s3c24xx_serial_start_tx(struct uart_port *port)
 {
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
+	struct circ_buf *xmit = &port->state->xmit;
 
 	if (!tx_enabled(port)) {
 		if (port->flags & UPF_CONS_FLOW)
 			s3c24xx_serial_rx_disable(port);
 
-		if (s3c24xx_serial_has_interrupt_mask(port))
-			__clear_bit(S3C64XX_UINTM_TXD,
-				portaddrl(port, S3C64XX_UINTM));
-		else
-			enable_irq(ourport->tx_irq);
 		tx_enabled(port) = 1;
+		if (!ourport->dma || !ourport->dma->tx_chan) {
+			if (s3c24xx_serial_has_interrupt_mask(port))
+				__clear_bit(S3C64XX_UINTM_TXD,
+						portaddrl(port, S3C64XX_UINTM));
+			else
+				enable_irq(ourport->tx_irq);
+
+			s3c24xx_serial_start_tx_pio(ourport);
+		}
+	}
+
+	if (ourport->dma && ourport->dma->tx_chan) {
+		if (!uart_circ_empty(xmit) && !ourport->tx_in_progress)
+			s3c24xx_serial_start_next_tx(ourport);
 	}
 }
 
@@ -333,10 +519,17 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 	struct uart_port *port = &ourport->port;
 	struct circ_buf *xmit = &port->state->xmit;
 	unsigned long flags;
-	int count = port->fifosize;
+	int count;
 
 	spin_lock_irqsave(&port->lock, flags);
 
+	count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+
+	if (ourport->dma && ourport->dma->tx_chan && count >= port->fifosize) {
+		s3c24xx_serial_start_tx_dma(ourport, count);
+		goto out;
+	}
+
 	if (port->x_char) {
 		wr_regb(port, S3C2410_UTXH, port->x_char);
 		port->icount.tx++;
@@ -355,6 +548,7 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 
 	/* try and drain the buffer... */
 
+	count = port->fifosize;
 	while (!uart_circ_empty(xmit) && count-- > 0) {
 		if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
 			break;
@@ -572,6 +766,7 @@ static void s3c24xx_serial_shutdown(struct uart_port *port)
 	if (ourport->dma)
 		s3c24xx_serial_release_dma(ourport);
 
+	ourport->tx_in_progress = 0;
 }
 
 static int s3c24xx_serial_startup(struct uart_port *port)
@@ -650,8 +845,19 @@ static int s3c64xx_serial_startup(struct uart_port *port)
 	tx_enabled(port) = 0;
 	ourport->tx_claimed = 1;
 
+	spin_lock_irqsave(&port->lock, flags);
+
+	ufcon = rd_regl(port, S3C2410_UFCON);
+	ufcon |= S3C2410_UFCON_RESETRX | S3C2410_UFCON_RESETTX;
+	wr_regl(port, S3C2410_UFCON, ufcon);
+
+	enable_rx_pio(ourport);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
 	/* Enable Rx Interrupt */
 	__clear_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM));
+
 	dbg("s3c64xx_serial_startup ok\n");
 	return ret;
 }
diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h
index 8dc250c6b472..e60011c591e8 100644
--- a/drivers/tty/serial/samsung.h
+++ b/drivers/tty/serial/samsung.h
@@ -86,6 +86,9 @@ struct s3c24xx_uart_port {
 	unsigned int			rx_irq;
 	unsigned int			tx_irq;
 
+	unsigned int			tx_in_progress;
+	unsigned int			tx_mode;
+
 	struct s3c24xx_uart_info	*info;
 	struct clk			*clk;
 	struct clk			*baudclk;
-- 
cgit v1.2.3-59-g8ed1b


From b543c301c2c5fbf24ed160a0c227122f09f38e5f Mon Sep 17 00:00:00 2001
From: Robert Baldyga <r.baldyga@samsung.com>
Date: Wed, 10 Dec 2014 12:49:27 +0100
Subject: serial: samsung: add DMA support for RX

Add RX DMA transfers support for samsung serial driver. It's enabled
when DMA controller for RX channel is specified in device-tree.

DMA transactions are started when number of bytes in RX FIFO reaches
trigger level, otherwise PIO mode is used. DMA transfer size is always
PAGE_SIZE which can cause large latency when smaller data amount is
transferred, so we always terminate DMA transaction on RX timeout
interrupt. Timeout interval is set to 64 frame times.

Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/samsung.c | 233 ++++++++++++++++++++++++++++++++++++++++++-
 drivers/tty/serial/samsung.h |   1 +
 2 files changed, 231 insertions(+), 3 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index c04618052e53..dae3c16ece09 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -83,6 +83,8 @@ static void dbg(const char *fmt, ...)
 
 #define S3C24XX_TX_PIO			1
 #define S3C24XX_TX_DMA			2
+#define S3C24XX_RX_PIO			1
+#define S3C24XX_RX_DMA			2
 /* macros to change one thing to another */
 
 #define tx_enabled(port) ((port)->unused[0])
@@ -373,9 +375,65 @@ void s3c24xx_serial_start_tx(struct uart_port *port)
 	}
 }
 
+static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
+		struct tty_port *tty, int count)
+{
+	struct s3c24xx_uart_dma *dma = ourport->dma;
+	int copied;
+
+	if (!count)
+		return;
+
+	dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr,
+				dma->rx_size, DMA_FROM_DEVICE);
+
+	ourport->port.icount.rx += count;
+	if (!tty) {
+		dev_err(ourport->port.dev, "No tty port\n");
+		return;
+	}
+	copied = tty_insert_flip_string(tty,
+			((unsigned char *)(ourport->dma->rx_buf)), count);
+	if (copied != count) {
+		WARN_ON(1);
+		dev_err(ourport->port.dev, "RxData copy to tty layer failed\n");
+	}
+}
+
+static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
+				     unsigned long ufstat);
+
+static void uart_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
+{
+	struct uart_port *port = &ourport->port;
+	struct tty_port *tty = &port->state->port;
+	unsigned int ch, ufstat;
+	unsigned int count;
+
+	ufstat = rd_regl(port, S3C2410_UFSTAT);
+	count = s3c24xx_serial_rx_fifocnt(ourport, ufstat);
+
+	if (!count)
+		return;
+
+	while (count-- > 0) {
+		ch = rd_regb(port, S3C2410_URXH);
+
+		ourport->port.icount.rx++;
+		tty_insert_flip_char(tty, ch, TTY_NORMAL);
+	}
+
+	tty_flip_buffer_push(tty);
+}
+
 static void s3c24xx_serial_stop_rx(struct uart_port *port)
 {
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
+	struct s3c24xx_uart_dma *dma = ourport->dma;
+	struct tty_port *t = &port->state->port;
+	struct dma_tx_state state;
+	enum dma_status dma_status;
+	unsigned int received;
 
 	if (rx_enabled(port)) {
 		dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
@@ -386,6 +444,17 @@ static void s3c24xx_serial_stop_rx(struct uart_port *port)
 			disable_irq_nosync(ourport->rx_irq);
 		rx_enabled(port) = 0;
 	}
+	if (dma && dma->rx_chan) {
+		dmaengine_pause(dma->tx_chan);
+		dma_status = dmaengine_tx_status(dma->rx_chan,
+				dma->rx_cookie, &state);
+		if (dma_status == DMA_IN_PROGRESS ||
+			dma_status == DMA_PAUSED) {
+			received = dma->rx_bytes_requested - state.residue;
+			dmaengine_terminate_all(dma->rx_chan);
+			s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
+		}
+	}
 }
 
 static inline struct s3c24xx_uart_info
@@ -417,12 +486,157 @@ static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
 	return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
 }
 
+static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport);
+static void s3c24xx_serial_rx_dma_complete(void *args)
+{
+	struct s3c24xx_uart_port *ourport = args;
+	struct uart_port *port = &ourport->port;
+
+	struct s3c24xx_uart_dma *dma = ourport->dma;
+	struct tty_port *t = &port->state->port;
+	struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
+
+	struct dma_tx_state state;
+	unsigned long flags;
+	int received;
+
+	dmaengine_tx_status(dma->rx_chan,  dma->rx_cookie, &state);
+	received  = dma->rx_bytes_requested - state.residue;
+	async_tx_ack(dma->rx_desc);
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	if (received)
+		s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
+
+	if (tty) {
+		tty_flip_buffer_push(t);
+		tty_kref_put(tty);
+	}
+
+	s3c64xx_start_rx_dma(ourport);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
+{
+	struct s3c24xx_uart_dma *dma = ourport->dma;
+
+	dma_sync_single_for_device(ourport->port.dev, dma->rx_addr,
+				dma->rx_size, DMA_FROM_DEVICE);
+
+	dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
+				dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
+				DMA_PREP_INTERRUPT);
+	if (!dma->rx_desc) {
+		dev_err(ourport->port.dev, "Unable to get desc for Rx\n");
+		return;
+	}
+
+	dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete;
+	dma->rx_desc->callback_param = ourport;
+	dma->rx_bytes_requested = dma->rx_size;
+
+	dma->rx_cookie = dmaengine_submit(dma->rx_desc);
+	dma_async_issue_pending(dma->rx_chan);
+}
 
 /* ? - where has parity gone?? */
 #define S3C2410_UERSTAT_PARITY (0x1000)
 
-static irqreturn_t
-s3c24xx_serial_rx_chars(int irq, void *dev_id)
+static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
+{
+	struct uart_port *port = &ourport->port;
+	unsigned int ucon;
+
+	/* set Rx mode to DMA mode */
+	ucon = rd_regl(port, S3C2410_UCON);
+	ucon &= ~(S3C64XX_UCON_RXBURST_MASK |
+			S3C64XX_UCON_TIMEOUT_MASK |
+			S3C64XX_UCON_EMPTYINT_EN |
+			S3C64XX_UCON_DMASUS_EN |
+			S3C64XX_UCON_TIMEOUT_EN |
+			S3C64XX_UCON_RXMODE_MASK);
+	ucon |= S3C64XX_UCON_RXBURST_16 |
+			0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
+			S3C64XX_UCON_EMPTYINT_EN |
+			S3C64XX_UCON_TIMEOUT_EN |
+			S3C64XX_UCON_RXMODE_DMA;
+	wr_regl(port, S3C2410_UCON, ucon);
+
+	ourport->rx_mode = S3C24XX_RX_DMA;
+}
+
+static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
+{
+	struct uart_port *port = &ourport->port;
+	unsigned int ucon;
+
+	/* set Rx mode to DMA mode */
+	ucon = rd_regl(port, S3C2410_UCON);
+	ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK |
+			S3C64XX_UCON_EMPTYINT_EN |
+			S3C64XX_UCON_DMASUS_EN |
+			S3C64XX_UCON_TIMEOUT_EN |
+			S3C64XX_UCON_RXMODE_MASK);
+	ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
+			S3C64XX_UCON_TIMEOUT_EN |
+			S3C64XX_UCON_RXMODE_CPU;
+	wr_regl(port, S3C2410_UCON, ucon);
+
+	ourport->rx_mode = S3C24XX_RX_PIO;
+}
+
+static irqreturn_t s3c24xx_serial_rx_chars_dma(int irq, void *dev_id)
+{
+	unsigned int utrstat, ufstat, received;
+	struct s3c24xx_uart_port *ourport = dev_id;
+	struct uart_port *port = &ourport->port;
+	struct s3c24xx_uart_dma *dma = ourport->dma;
+	struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
+	struct tty_port *t = &port->state->port;
+	unsigned long flags;
+	struct dma_tx_state state;
+
+	utrstat = rd_regl(port, S3C2410_UTRSTAT);
+	ufstat = rd_regl(port, S3C2410_UFSTAT);
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) {
+		s3c64xx_start_rx_dma(ourport);
+		if (ourport->rx_mode == S3C24XX_RX_PIO)
+			enable_rx_dma(ourport);
+		goto finish;
+	}
+
+	if (ourport->rx_mode == S3C24XX_RX_DMA) {
+		dmaengine_pause(dma->rx_chan);
+		dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
+		dmaengine_terminate_all(dma->rx_chan);
+		received = dma->rx_bytes_requested - state.residue;
+		s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
+
+		enable_rx_pio(ourport);
+	}
+
+	uart_rx_drain_fifo(ourport);
+
+	if (tty) {
+		tty_flip_buffer_push(t);
+		tty_kref_put(tty);
+	}
+
+	wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT);
+
+finish:
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t s3c24xx_serial_rx_chars_pio(int irq, void *dev_id)
 {
 	struct s3c24xx_uart_port *ourport = dev_id;
 	struct uart_port *port = &ourport->port;
@@ -513,6 +727,16 @@ out:
 	return IRQ_HANDLED;
 }
 
+
+static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id)
+{
+	struct s3c24xx_uart_port *ourport = dev_id;
+
+	if (ourport->dma && ourport->dma->rx_chan)
+		return s3c24xx_serial_rx_chars_dma(irq, dev_id);
+	return s3c24xx_serial_rx_chars_pio(irq, dev_id);
+}
+
 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 {
 	struct s3c24xx_uart_port *ourport = id;
@@ -818,6 +1042,8 @@ err:
 static int s3c64xx_serial_startup(struct uart_port *port)
 {
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
+	unsigned long flags;
+	unsigned int ufcon;
 	int ret;
 
 	dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n",
@@ -848,7 +1074,8 @@ static int s3c64xx_serial_startup(struct uart_port *port)
 	spin_lock_irqsave(&port->lock, flags);
 
 	ufcon = rd_regl(port, S3C2410_UFCON);
-	ufcon |= S3C2410_UFCON_RESETRX | S3C2410_UFCON_RESETTX;
+	ufcon |= S3C2410_UFCON_RESETRX | S3C2410_UFCON_RESETTX |
+			S5PV210_UFCON_RXTRIG8;
 	wr_regl(port, S3C2410_UFCON, ufcon);
 
 	enable_rx_pio(ourport);
diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h
index e60011c591e8..d275032aa68d 100644
--- a/drivers/tty/serial/samsung.h
+++ b/drivers/tty/serial/samsung.h
@@ -88,6 +88,7 @@ struct s3c24xx_uart_port {
 
 	unsigned int			tx_in_progress;
 	unsigned int			tx_mode;
+	unsigned int			rx_mode;
 
 	struct s3c24xx_uart_info	*info;
 	struct clk			*clk;
-- 
cgit v1.2.3-59-g8ed1b


From 47ef6df27e0b420b44966043935ca96791184782 Mon Sep 17 00:00:00 2001
From: Ley Foon Tan <lftan@altera.com>
Date: Tue, 16 Dec 2014 15:27:46 +0800
Subject: serial: altera-juart: fix NULL device in log message

Add device pointer to port->dev.

Before:

"(NULL device *): ttyJ0 at MMIO 0x1008 (irq = 2, base_baud = 0) is a
Altera JTAG UART"

After:
"altera_jtaguart 1008.serial: ttyJ0 at MMIO 0x1008 (irq = 2, base_baud = 0) is a
Altera JTAG UART"

Signed-off-by: Ley Foon Tan <lftan@altera.com>
Acked-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/altera_jtaguart.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index 192d0435bb86..0fefdd8931a2 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -441,6 +441,7 @@ static int altera_jtaguart_probe(struct platform_device *pdev)
 	port->iotype = SERIAL_IO_MEM;
 	port->ops = &altera_jtaguart_ops;
 	port->flags = UPF_BOOT_AUTOCONF;
+	port->dev = &pdev->dev;
 
 	uart_add_one_port(&altera_jtaguart_driver, port);
 
-- 
cgit v1.2.3-59-g8ed1b


From b820cd7643d5fdf05d6f5d32507d330609113248 Mon Sep 17 00:00:00 2001
From: Ley Foon Tan <lftan@altera.com>
Date: Tue, 16 Dec 2014 15:28:34 +0800
Subject: serial: altera-uart: fix NULL device in log message

Add device pointer to port->dev.

Before:

"(NULL device *): ttyAL0 at MMIO 0x2020 (irq = 6, base_baud = 3125000)
is a Altera UART"

After:
"altera_uart 2020.serial: ttyAL0 at MMIO 0x2020 (irq = 6, base_baud = 3125000)
is a Altera UART"

Signed-off-by: Ley Foon Tan <lftan@altera.com>
Acked-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/altera_uart.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
index eb15a50623cb..b2859fe07e14 100644
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -589,6 +589,7 @@ static int altera_uart_probe(struct platform_device *pdev)
 	port->iotype = SERIAL_IO_MEM;
 	port->ops = &altera_uart_ops;
 	port->flags = UPF_BOOT_AUTOCONF;
+	port->dev = &pdev->dev;
 
 	platform_set_drvdata(pdev, port);
 
-- 
cgit v1.2.3-59-g8ed1b


From 8d267fd98b7706a6296409b69bf2cca42087a9ef Mon Sep 17 00:00:00 2001
From: Eric Nelson <eric.nelson@boundarydevices.com>
Date: Thu, 18 Dec 2014 12:37:13 -0700
Subject: serial: imx: preserve characters with parity or framing errors

If IGNPAR/INPCK are clear in termios->c_iflag,  characters
received with parity or framing errors should be preserved
and passed to the upper layers of the tty stack.

Specifically, the decision of whether to set the character
value to zero should be made by n_tty.c/n_tty_receive_parity_error().

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 72b800b296b1..6ac22d75a4bb 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -733,7 +733,7 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
 				continue;
 			}
 
-			rx &= sport->port.read_status_mask;
+			rx &= (sport->port.read_status_mask | 0xFF);
 
 			if (rx & URXD_BRK)
 				flg = TTY_BREAK;
-- 
cgit v1.2.3-59-g8ed1b


From 865cea8589546025759689e034b950d1c59ed291 Mon Sep 17 00:00:00 2001
From: Eric Nelson <eric.nelson@boundarydevices.com>
Date: Thu, 18 Dec 2014 12:37:14 -0700
Subject: serial: imx: ignore framing errors when IGNPAR is set.

When IGNPAR is set in termios->c_iflag,  characters with
framing errors should be ignored.

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 6ac22d75a4bb..59d9ef10b085 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1410,7 +1410,7 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
 	 */
 	sport->port.ignore_status_mask = 0;
 	if (termios->c_iflag & IGNPAR)
-		sport->port.ignore_status_mask |= URXD_PRERR;
+		sport->port.ignore_status_mask |= URXD_PRERR | URXD_FRMERR;
 	if (termios->c_iflag & IGNBRK) {
 		sport->port.ignore_status_mask |= URXD_BRK;
 		/*
-- 
cgit v1.2.3-59-g8ed1b


From 5930cb3511dfb4392de1180c892b353316ef29ec Mon Sep 17 00:00:00 2001
From: Baruch Siach <baruch@tkos.co.il>
Date: Thu, 18 Dec 2014 21:45:24 +0200
Subject: serial: driver for Conexant Digicolor USART

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/Kconfig           |  15 +
 drivers/tty/serial/Makefile          |   1 +
 drivers/tty/serial/digicolor-usart.c | 563 +++++++++++++++++++++++++++++++++++
 include/uapi/linux/serial_core.h     |   3 +
 4 files changed, 582 insertions(+)
 create mode 100644 drivers/tty/serial/digicolor-usart.c

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index c79b43cd6014..96ec6cfd74e8 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1549,6 +1549,21 @@ config SERIAL_FSL_LPUART_CONSOLE
 	  If you have enabled the lpuart serial port on the Freescale SoCs,
 	  you can make it the console by answering Y to this option.
 
+config SERIAL_CONEXANT_DIGICOLOR
+	tristate "Conexant Digicolor CX92xxx USART serial port support"
+	depends on OF
+	select SERIAL_CORE
+	help
+	  Support for the on-chip USART on Conexant Digicolor SoCs.
+
+config SERIAL_CONEXANT_DIGICOLOR_CONSOLE
+	bool "Console on Conexant Digicolor serial port"
+	depends on SERIAL_CONEXANT_DIGICOLOR=y
+	select SERIAL_CORE_CONSOLE
+	help
+	  If you have enabled the USART serial port on Conexant Digicolor
+	  SoCs, you can make it the console by answering Y to this option.
+
 config SERIAL_ST_ASC
 	tristate "ST ASC serial port support"
 	select SERIAL_CORE
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 9a548acf5fdc..770a19bb7fcb 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_SERIAL_EFM32_UART) += efm32-uart.o
 obj-$(CONFIG_SERIAL_ARC)	+= arc_uart.o
 obj-$(CONFIG_SERIAL_RP2)	+= rp2.o
 obj-$(CONFIG_SERIAL_FSL_LPUART)	+= fsl_lpuart.o
+obj-$(CONFIG_SERIAL_CONEXANT_DIGICOLOR)	+= digicolor-usart.o
 obj-$(CONFIG_SERIAL_MEN_Z135)	+= men_z135_uart.o
 
 # GPIOLIB helpers for modem control lines
diff --git a/drivers/tty/serial/digicolor-usart.c b/drivers/tty/serial/digicolor-usart.c
new file mode 100644
index 000000000000..09ce0b3764e2
--- /dev/null
+++ b/drivers/tty/serial/digicolor-usart.c
@@ -0,0 +1,563 @@
+/*
+ *  Driver for Conexant Digicolor serial ports (USART)
+ *
+ * Author: Baruch Siach <baruch@tkos.co.il>
+ *
+ * Copyright (C) 2014 Paradox Innovation Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/console.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+
+#define UA_ENABLE			0x00
+#define UA_ENABLE_ENABLE		BIT(0)
+
+#define UA_CONTROL			0x01
+#define UA_CONTROL_RX_ENABLE		BIT(0)
+#define UA_CONTROL_TX_ENABLE		BIT(1)
+#define UA_CONTROL_SOFT_RESET		BIT(2)
+
+#define UA_STATUS			0x02
+#define UA_STATUS_PARITY_ERR		BIT(0)
+#define UA_STATUS_FRAME_ERR		BIT(1)
+#define UA_STATUS_OVERRUN_ERR		BIT(2)
+#define UA_STATUS_TX_READY		BIT(6)
+
+#define UA_CONFIG			0x03
+#define UA_CONFIG_CHAR_LEN		BIT(0)
+#define UA_CONFIG_STOP_BITS		BIT(1)
+#define UA_CONFIG_PARITY		BIT(2)
+#define UA_CONFIG_ODD_PARITY		BIT(4)
+
+#define UA_EMI_REC			0x04
+
+#define UA_HBAUD_LO			0x08
+#define UA_HBAUD_HI			0x09
+
+#define UA_STATUS_FIFO			0x0a
+#define UA_STATUS_FIFO_RX_EMPTY		BIT(2)
+#define UA_STATUS_FIFO_RX_INT_ALMOST	BIT(3)
+#define UA_STATUS_FIFO_TX_FULL		BIT(4)
+#define UA_STATUS_FIFO_TX_INT_ALMOST	BIT(7)
+
+#define UA_CONFIG_FIFO			0x0b
+#define UA_CONFIG_FIFO_RX_THRESH	7
+#define UA_CONFIG_FIFO_RX_FIFO_MODE	BIT(3)
+#define UA_CONFIG_FIFO_TX_FIFO_MODE	BIT(7)
+
+#define UA_INTFLAG_CLEAR		0x1c
+#define UA_INTFLAG_SET			0x1d
+#define UA_INT_ENABLE			0x1e
+#define UA_INT_STATUS			0x1f
+
+#define UA_INT_TX			BIT(0)
+#define UA_INT_RX			BIT(1)
+
+#define DIGICOLOR_USART_NR		3
+
+/*
+ * We use the 16 bytes hardware FIFO to buffer Rx traffic. Rx interrupt is
+ * only produced when the FIFO is filled more than a certain configurable
+ * threshold. Unfortunately, there is no way to set this threshold below half
+ * FIFO. This means that we must periodically poll the FIFO status register to
+ * see whether there are waiting Rx bytes.
+ */
+
+struct digicolor_port {
+	struct uart_port port;
+	struct delayed_work rx_poll_work;
+};
+
+static struct uart_port *digicolor_ports[DIGICOLOR_USART_NR];
+
+static bool digicolor_uart_tx_full(struct uart_port *port)
+{
+	return !!(readb_relaxed(port->membase + UA_STATUS_FIFO) &
+		  UA_STATUS_FIFO_TX_FULL);
+}
+
+static bool digicolor_uart_rx_empty(struct uart_port *port)
+{
+	return !!(readb_relaxed(port->membase + UA_STATUS_FIFO) &
+		  UA_STATUS_FIFO_RX_EMPTY);
+}
+
+static void digicolor_uart_stop_tx(struct uart_port *port)
+{
+	u8 int_enable = readb_relaxed(port->membase + UA_INT_ENABLE);
+
+	int_enable &= ~UA_INT_TX;
+	writeb_relaxed(int_enable, port->membase + UA_INT_ENABLE);
+}
+
+static void digicolor_uart_start_tx(struct uart_port *port)
+{
+	u8 int_enable = readb_relaxed(port->membase + UA_INT_ENABLE);
+
+	int_enable |= UA_INT_TX;
+	writeb_relaxed(int_enable, port->membase + UA_INT_ENABLE);
+}
+
+static void digicolor_uart_stop_rx(struct uart_port *port)
+{
+	u8 int_enable = readb_relaxed(port->membase + UA_INT_ENABLE);
+
+	int_enable &= ~UA_INT_RX;
+	writeb_relaxed(int_enable, port->membase + UA_INT_ENABLE);
+}
+
+static void digicolor_rx_poll(struct work_struct *work)
+{
+	struct digicolor_port *dp =
+		container_of(to_delayed_work(work),
+			     struct digicolor_port, rx_poll_work);
+
+	if (!digicolor_uart_rx_empty(&dp->port))
+		/* force RX interrupt */
+		writeb_relaxed(UA_INT_RX, dp->port.membase + UA_INTFLAG_SET);
+
+	schedule_delayed_work(&dp->rx_poll_work, msecs_to_jiffies(100));
+}
+
+static void digicolor_uart_rx(struct uart_port *port)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	while (1) {
+		u8 status, ch;
+		unsigned int ch_flag;
+
+		if (digicolor_uart_rx_empty(port))
+			break;
+
+		ch = readb_relaxed(port->membase + UA_EMI_REC);
+		status = readb_relaxed(port->membase + UA_STATUS);
+
+		port->icount.rx++;
+		ch_flag = TTY_NORMAL;
+
+		if (status) {
+			if (status & UA_STATUS_PARITY_ERR)
+				port->icount.parity++;
+			else if (status & UA_STATUS_FRAME_ERR)
+				port->icount.frame++;
+			else if (status & UA_STATUS_OVERRUN_ERR)
+				port->icount.overrun++;
+
+			status &= port->read_status_mask;
+
+			if (status & UA_STATUS_PARITY_ERR)
+				ch_flag = TTY_PARITY;
+			else if (status & UA_STATUS_FRAME_ERR)
+				ch_flag = TTY_FRAME;
+			else if (status & UA_STATUS_OVERRUN_ERR)
+				ch_flag = TTY_OVERRUN;
+		}
+
+		if (uart_handle_sysrq_char(port, ch))
+			continue;
+
+		if (status & port->ignore_status_mask)
+			continue;
+
+		uart_insert_char(port, status, UA_STATUS_OVERRUN_ERR, ch,
+				 ch_flag);
+	}
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	tty_flip_buffer_push(&port->state->port);
+}
+
+static void digicolor_uart_tx(struct uart_port *port)
+{
+	struct circ_buf *xmit = &port->state->xmit;
+	unsigned long flags;
+
+	if (digicolor_uart_tx_full(port))
+		return;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	if (port->x_char) {
+		writeb_relaxed(port->x_char, port->membase + UA_EMI_REC);
+		port->icount.tx++;
+		port->x_char = 0;
+		goto out;
+	}
+
+	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+		digicolor_uart_stop_tx(port);
+		goto out;
+	}
+
+	while (!uart_circ_empty(xmit)) {
+		writeb(xmit->buf[xmit->tail], port->membase + UA_EMI_REC);
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		port->icount.tx++;
+
+		if (digicolor_uart_tx_full(port))
+			break;
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
+out:
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static irqreturn_t digicolor_uart_int(int irq, void *dev_id)
+{
+	struct uart_port *port = dev_id;
+	u8 int_status = readb_relaxed(port->membase + UA_INT_STATUS);
+
+	writeb_relaxed(UA_INT_RX | UA_INT_TX,
+		       port->membase + UA_INTFLAG_CLEAR);
+
+	if (int_status & UA_INT_RX)
+		digicolor_uart_rx(port);
+	if (int_status & UA_INT_TX)
+		digicolor_uart_tx(port);
+
+	return IRQ_HANDLED;
+}
+
+static unsigned int digicolor_uart_tx_empty(struct uart_port *port)
+{
+	u8 status = readb_relaxed(port->membase + UA_STATUS);
+
+	return (status & UA_STATUS_TX_READY) ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int digicolor_uart_get_mctrl(struct uart_port *port)
+{
+	return TIOCM_CTS;
+}
+
+static void digicolor_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+static void digicolor_uart_break_ctl(struct uart_port *port, int state)
+{
+}
+
+static int digicolor_uart_startup(struct uart_port *port)
+{
+	struct digicolor_port *dp =
+		container_of(port, struct digicolor_port, port);
+
+	writeb_relaxed(UA_ENABLE_ENABLE, port->membase + UA_ENABLE);
+	writeb_relaxed(UA_CONTROL_SOFT_RESET, port->membase + UA_CONTROL);
+	writeb_relaxed(0, port->membase + UA_CONTROL);
+
+	writeb_relaxed(UA_CONFIG_FIFO_RX_FIFO_MODE
+		       | UA_CONFIG_FIFO_TX_FIFO_MODE | UA_CONFIG_FIFO_RX_THRESH,
+		       port->membase + UA_CONFIG_FIFO);
+	writeb_relaxed(UA_STATUS_FIFO_RX_INT_ALMOST,
+		       port->membase + UA_STATUS_FIFO);
+	writeb_relaxed(UA_CONTROL_RX_ENABLE | UA_CONTROL_TX_ENABLE,
+		       port->membase + UA_CONTROL);
+	writeb_relaxed(UA_INT_TX | UA_INT_RX,
+		       port->membase + UA_INT_ENABLE);
+
+	schedule_delayed_work(&dp->rx_poll_work, msecs_to_jiffies(100));
+
+	return 0;
+}
+
+static void digicolor_uart_shutdown(struct uart_port *port)
+{
+	struct digicolor_port *dp =
+		container_of(port, struct digicolor_port, port);
+
+	writeb_relaxed(0, port->membase + UA_ENABLE);
+	cancel_delayed_work_sync(&dp->rx_poll_work);
+}
+
+static void digicolor_uart_set_termios(struct uart_port *port,
+				       struct ktermios *termios,
+				       struct ktermios *old)
+{
+	unsigned int baud, divisor;
+	u8 config = 0;
+	unsigned long flags;
+
+	/* Mask termios capabilities we don't support */
+	termios->c_cflag &= ~CMSPAR;
+	termios->c_iflag &= ~(BRKINT | IGNBRK);
+
+	/* Limit baud rates so that we don't need the fractional divider */
+	baud = uart_get_baud_rate(port, termios, old,
+				  port->uartclk / (0x10000*16),
+				  port->uartclk / 256);
+	divisor = uart_get_divisor(port, baud) - 1;
+
+	switch (termios->c_cflag & CSIZE) {
+	case CS7:
+		break;
+	case CS8:
+	default:
+		config |= UA_CONFIG_CHAR_LEN;
+		break;
+	}
+
+	if (termios->c_cflag & CSTOPB)
+		config |= UA_CONFIG_STOP_BITS;
+
+	if (termios->c_cflag & PARENB) {
+		config |= UA_CONFIG_PARITY;
+		if (termios->c_cflag & PARODD)
+			config |= UA_CONFIG_ODD_PARITY;
+	}
+
+	/* Set read status mask */
+	port->read_status_mask = UA_STATUS_OVERRUN_ERR;
+	if (termios->c_iflag & INPCK)
+		port->read_status_mask |= UA_STATUS_PARITY_ERR
+			| UA_STATUS_FRAME_ERR;
+
+	/* Set status ignore mask */
+	port->ignore_status_mask = 0;
+	if (!(termios->c_cflag & CREAD))
+		port->ignore_status_mask |= UA_STATUS_OVERRUN_ERR
+			| UA_STATUS_PARITY_ERR | UA_STATUS_FRAME_ERR;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	uart_update_timeout(port, termios->c_cflag, baud);
+
+	writeb_relaxed(config, port->membase + UA_CONFIG);
+	writeb_relaxed(divisor & 0xff, port->membase + UA_HBAUD_LO);
+	writeb_relaxed(divisor >> 8, port->membase + UA_HBAUD_HI);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *digicolor_uart_type(struct uart_port *port)
+{
+	return (port->type == PORT_DIGICOLOR) ? "DIGICOLOR USART" : NULL;
+}
+
+static void digicolor_uart_config_port(struct uart_port *port, int flags)
+{
+	if (flags & UART_CONFIG_TYPE)
+		port->type = PORT_DIGICOLOR;
+}
+
+static void digicolor_uart_release_port(struct uart_port *port)
+{
+}
+
+static int digicolor_uart_request_port(struct uart_port *port)
+{
+	return 0;
+}
+
+static const struct uart_ops digicolor_uart_ops = {
+	.tx_empty	= digicolor_uart_tx_empty,
+	.set_mctrl	= digicolor_uart_set_mctrl,
+	.get_mctrl	= digicolor_uart_get_mctrl,
+	.stop_tx	= digicolor_uart_stop_tx,
+	.start_tx	= digicolor_uart_start_tx,
+	.stop_rx	= digicolor_uart_stop_rx,
+	.break_ctl	= digicolor_uart_break_ctl,
+	.startup	= digicolor_uart_startup,
+	.shutdown	= digicolor_uart_shutdown,
+	.set_termios	= digicolor_uart_set_termios,
+	.type		= digicolor_uart_type,
+	.config_port	= digicolor_uart_config_port,
+	.release_port	= digicolor_uart_release_port,
+	.request_port	= digicolor_uart_request_port,
+};
+
+static void digicolor_uart_console_putchar(struct uart_port *port, int ch)
+{
+	while (digicolor_uart_tx_full(port))
+		cpu_relax();
+
+	writeb_relaxed(ch, port->membase + UA_EMI_REC);
+}
+
+static void digicolor_uart_console_write(struct console *co, const char *c,
+					 unsigned n)
+{
+	struct uart_port *port = digicolor_ports[co->index];
+	u8 status;
+	unsigned long flags;
+	int locked = 1;
+
+	if (port->sysrq || oops_in_progress)
+		locked = spin_trylock_irqsave(&port->lock, flags);
+	else
+		spin_lock_irqsave(&port->lock, flags);
+
+	uart_console_write(port, c, n, digicolor_uart_console_putchar);
+
+	if (locked)
+		spin_unlock_irqrestore(&port->lock, flags);
+
+	/* Wait for transmitter to become empty */
+	do {
+		status = readb_relaxed(port->membase + UA_STATUS);
+	} while ((status & UA_STATUS_TX_READY) == 0);
+}
+
+static int digicolor_uart_console_setup(struct console *co, char *options)
+{
+	int baud = 115200, bits = 8, parity = 'n', flow = 'n';
+	struct uart_port *port;
+
+	if (co->index < 0 || co->index >= DIGICOLOR_USART_NR)
+		return -EINVAL;
+
+	port = digicolor_ports[co->index];
+	if (!port)
+		return -ENODEV;
+
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+	return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct console digicolor_console = {
+	.name	= "ttyS",
+	.device	= uart_console_device,
+	.write	= digicolor_uart_console_write,
+	.setup	= digicolor_uart_console_setup,
+	.flags	= CON_PRINTBUFFER,
+	.index	= -1,
+};
+
+static struct uart_driver digicolor_uart = {
+	.driver_name	= "digicolor-usart",
+	.dev_name	= "ttyS",
+	.nr		= DIGICOLOR_USART_NR,
+};
+
+static int digicolor_uart_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	int ret, index;
+	struct digicolor_port *dp;
+	struct resource *res;
+	struct clk *uart_clk;
+
+	if (!np) {
+		dev_err(&pdev->dev, "Missing device tree node\n");
+		return -ENXIO;
+	}
+
+	index = of_alias_get_id(np, "serial");
+	if (index < 0 || index >= DIGICOLOR_USART_NR)
+		return -EINVAL;
+
+	dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
+	if (!dp)
+		return -ENOMEM;
+
+	uart_clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(uart_clk))
+		return PTR_ERR(uart_clk);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dp->port.mapbase = res->start;
+	dp->port.membase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(dp->port.membase))
+		return PTR_ERR(dp->port.membase);
+
+	dp->port.irq = platform_get_irq(pdev, 0);
+	if (IS_ERR_VALUE(dp->port.irq))
+		return dp->port.irq;
+
+	dp->port.iotype = UPIO_MEM;
+	dp->port.uartclk = clk_get_rate(uart_clk);
+	dp->port.fifosize = 16;
+	dp->port.dev = &pdev->dev;
+	dp->port.ops = &digicolor_uart_ops;
+	dp->port.line = index;
+	dp->port.type = PORT_DIGICOLOR;
+	spin_lock_init(&dp->port.lock);
+
+	digicolor_ports[index] = &dp->port;
+	platform_set_drvdata(pdev, &dp->port);
+
+	INIT_DELAYED_WORK(&dp->rx_poll_work, digicolor_rx_poll);
+
+	ret = devm_request_irq(&pdev->dev, dp->port.irq, digicolor_uart_int, 0,
+			       dev_name(&pdev->dev), &dp->port);
+	if (ret)
+		return ret;
+
+	return uart_add_one_port(&digicolor_uart, &dp->port);
+}
+
+static int digicolor_uart_remove(struct platform_device *pdev)
+{
+	struct uart_port *port = platform_get_drvdata(pdev);
+
+	uart_remove_one_port(&digicolor_uart, port);
+
+	return 0;
+}
+
+static const struct of_device_id digicolor_uart_dt_ids[] = {
+	{ .compatible = "cnxt,cx92755-usart", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, digicolor_uart_dt_ids);
+
+static struct platform_driver digicolor_uart_platform = {
+	.driver = {
+		.name		= "digicolor-usart",
+		.of_match_table	= of_match_ptr(digicolor_uart_dt_ids),
+	},
+	.probe	= digicolor_uart_probe,
+	.remove	= digicolor_uart_remove,
+};
+
+static int __init digicolor_uart_init(void)
+{
+	int ret;
+
+	if (IS_ENABLED(CONFIG_SERIAL_CONEXANT_DIGICOLOR_CONSOLE)) {
+		digicolor_uart.cons = &digicolor_console;
+		digicolor_console.data = &digicolor_uart;
+	}
+
+	ret = uart_register_driver(&digicolor_uart);
+	if (ret)
+		return ret;
+
+	return platform_driver_register(&digicolor_uart_platform);
+}
+module_init(digicolor_uart_init);
+
+static void __exit digicolor_uart_exit(void)
+{
+	platform_driver_unregister(&digicolor_uart_platform);
+	uart_unregister_driver(&digicolor_uart);
+}
+module_exit(digicolor_uart_exit);
+
+MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
+MODULE_DESCRIPTION("Conexant Digicolor USART serial driver");
+MODULE_LICENSE("GPL");
diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index c17218094f18..9124e837c181 100644
--- a/include/uapi/linux/serial_core.h
+++ b/include/uapi/linux/serial_core.h
@@ -248,4 +248,7 @@
 /* MESON */
 #define PORT_MESON	109
 
+/* Conexant Digicolor */
+#define PORT_DIGICOLOR	110
+
 #endif /* _UAPILINUX_SERIAL_CORE_H */
-- 
cgit v1.2.3-59-g8ed1b


From fddceb8b5399083bcc042266f188116cc779fc80 Mon Sep 17 00:00:00 2001
From: Vijay Rai <vijay.rai@freescale.com>
Date: Mon, 5 Jan 2015 21:14:42 +0530
Subject: tty: 8250: Add 64byte UART support for FSL platforms

Some of FSL SoCs like T1040 has new version of UART controller which
can support 64byte FiFo.
To enable 64 byte support, following needs to be done:
-FCR[EN64] needs to be programmed to 1 to enable it.
-Also, when FCR[EN64]==1, RTL bits to be used as below
to define various Receive Trigger Levels:
        -FCR[RTL] = 00  1 byte
        -FCR[RTL] = 01  16 bytes
        -FCR[RTL] = 10  32 bytes
        -FCR[RTL] = 11  56 bytes
-tx_loadsz is set to 63-bytes instead of 64-bytes to implement
 workaround of errata A-008006 which states that tx_loadsz should
 be configured less than Maximum supported fifo bytes

Signed-off-by: Vijay Rai <vijay.rai@freescale.com>
Signed-off-by: Priyanka Jain <Priyanka.Jain@freescale.com>
Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_core.c | 23 ++++++++++++++++++++++-
 include/uapi/linux/serial_core.h    |  3 ++-
 include/uapi/linux/serial_reg.h     |  3 ++-
 3 files changed, 26 insertions(+), 3 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 3bfcfdb57d05..689169c11f0f 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -329,6 +329,17 @@ static const struct serial8250_config uart_config[] = {
 		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
 		.flags		= UART_CAP_FIFO | UART_CAP_AFE,
 	},
+/* tx_loadsz is set to 63-bytes instead of 64-bytes to implement
+workaround of errata A-008006 which states that tx_loadsz should  be
+configured less than Maximum supported fifo bytes */
+	[PORT_16550A_FSL64] = {
+		.name		= "16550A_FSL64",
+		.fifo_size	= 64,
+		.tx_loadsz	= 63,
+		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 |
+				  UART_FCR7_64BYTE,
+		.flags		= UART_CAP_FIFO,
+	},
 };
 
 /* Uart divisor latch read */
@@ -956,7 +967,17 @@ static void autoconfig_16550a(struct uart_8250_port *up)
 			up->port.type = PORT_16650;
 			up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP;
 		} else {
-			DEBUG_AUTOCONF("Motorola 8xxx DUART ");
+			serial_out(up, UART_LCR, 0);
+			serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+				   UART_FCR7_64BYTE);
+			status1 = serial_in(up, UART_IIR) >> 5;
+			serial_out(up, UART_FCR, 0);
+			serial_out(up, UART_LCR, 0);
+
+			if (status1 == 7)
+				up->port.type = PORT_16550A_FSL64;
+			else
+				DEBUG_AUTOCONF("Motorola 8xxx DUART ");
 		}
 		serial_out(up, UART_EFR, 0);
 		return;
diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index 9124e837c181..ee628c489e47 100644
--- a/include/uapi/linux/serial_core.h
+++ b/include/uapi/linux/serial_core.h
@@ -55,7 +55,8 @@
 #define PORT_ALTR_16550_F64 27	/* Altera 16550 UART with 64 FIFOs */
 #define PORT_ALTR_16550_F128 28 /* Altera 16550 UART with 128 FIFOs */
 #define PORT_RT2880	29	/* Ralink RT2880 internal UART */
-#define PORT_MAX_8250	29	/* max port ID */
+#define PORT_16550A_FSL64 30	/* Freescale 16550 UART with 64 FIFOs */
+#define PORT_MAX_8250	30	/* max port ID */
 
 /*
  * ARM specific type numbers.  These are not currently guaranteed
diff --git a/include/uapi/linux/serial_reg.h b/include/uapi/linux/serial_reg.h
index 53af3b790129..00adb01fa5f3 100644
--- a/include/uapi/linux/serial_reg.h
+++ b/include/uapi/linux/serial_reg.h
@@ -86,7 +86,8 @@
 #define UART_FCR6_T_TRIGGER_8	0x10 /* Mask for transmit trigger set at 8 */
 #define UART_FCR6_T_TRIGGER_24  0x20 /* Mask for transmit trigger set at 24 */
 #define UART_FCR6_T_TRIGGER_30	0x30 /* Mask for transmit trigger set at 30 */
-#define UART_FCR7_64BYTE	0x20 /* Go into 64 byte mode (TI16C750) */
+#define UART_FCR7_64BYTE	0x20 /* Go into 64 byte mode (TI16C750 and
+					some Freescale UARTs) */
 
 #define UART_FCR_R_TRIG_SHIFT		6
 #define UART_FCR_R_TRIG_BITS(x)		\
-- 
cgit v1.2.3-59-g8ed1b


From 5567c37dea5e3146c26a691451925218bd484c01 Mon Sep 17 00:00:00 2001
From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Date: Tue, 6 Jan 2015 16:59:10 +0530
Subject: serial: 8250_early: optimize early 8250 uart

In early 8250, IER is already zero so no point in writing this - twice
per line

This helped improve the SystemC model based ARC OSCI platform

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: linux-serial@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Rob Herring <robh@kernel.org>
Cc: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_early.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index 4858b8a99d3b..ce2a8abd1f54 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -95,13 +95,16 @@ static void __init early_serial8250_write(struct console *console,
 
 	/* Save the IER and disable interrupts */
 	ier = serial8250_early_in(port, UART_IER);
-	serial8250_early_out(port, UART_IER, 0);
+	if (ier)
+		serial8250_early_out(port, UART_IER, 0);
 
 	uart_console_write(port, s, count, serial_putc);
 
 	/* Wait for transmitter to become empty and restore the IER */
 	wait_for_xmitr(port);
-	serial8250_early_out(port, UART_IER, ier);
+
+	if (ier)
+		serial8250_early_out(port, UART_IER, ier);
 }
 
 static unsigned int __init probe_baud(struct uart_port *port)
-- 
cgit v1.2.3-59-g8ed1b


From 1d6a5e4ce883be40c05dc4080d24fab0b432a9ec Mon Sep 17 00:00:00 2001
From: Julia Lawall <Julia.Lawall@lip6.fr>
Date: Sun, 7 Dec 2014 20:20:48 +0100
Subject: TTY: fix misspelling of current function in string

Replace the last argument of serial_paranoia_check by the actual function
name.

This was done using Coccinelle, including the use of Levenshtein distance,
as proposed by Rasmus Villemoes.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/amiserial.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index d9f85f95eb2a..b2d760055952 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -931,7 +931,7 @@ static void rs_send_xchar(struct tty_struct *tty, char ch)
 	struct serial_state *info = tty->driver_data;
         unsigned long flags;
 
-	if (serial_paranoia_check(info, tty->name, "rs_send_char"))
+	if (serial_paranoia_check(info, tty->name, "rs_send_xchar"))
 		return;
 
 	info->x_char = ch;
-- 
cgit v1.2.3-59-g8ed1b


From e5f50fbef0818f01d9ad387c54a110de0ab0e663 Mon Sep 17 00:00:00 2001
From: Julia Lawall <Julia.Lawall@lip6.fr>
Date: Sun, 7 Dec 2014 20:21:01 +0100
Subject: TTY: fix misspelling of current function in string

Replace a misspelled function name by %s and then __func__.

This was done using Coccinelle, including the use of Levenshtein distance,
as proposed by Rasmus Villemoes.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/rocket.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index 383c4c796637..c8dd8dc31086 100644
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -1390,7 +1390,7 @@ static void rp_unthrottle(struct tty_struct *tty)
 	       tty->ldisc.chars_in_buffer(tty));
 #endif
 
-	if (rocket_paranoia_check(info, "rp_throttle"))
+	if (rocket_paranoia_check(info, "rp_unthrottle"))
 		return;
 
 	if (I_IXOFF(tty))
@@ -1458,7 +1458,7 @@ static void rp_wait_until_sent(struct tty_struct *tty, int timeout)
 
 	orig_jiffies = jiffies;
 #ifdef ROCKET_DEBUG_WAIT_UNTIL_SENT
-	printk(KERN_INFO "In RP_wait_until_sent(%d) (jiff=%lu)...\n", timeout,
+	printk(KERN_INFO "In %s(%d) (jiff=%lu)...\n", __func__, timeout,
 	       jiffies);
 	printk(KERN_INFO "cps=%d...\n", info->cps);
 #endif
-- 
cgit v1.2.3-59-g8ed1b


From 2cf30f752c8f73713f58796eb218cafa242d66fe Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@intel.com>
Date: Tue, 16 Dec 2014 00:15:59 +0200
Subject: vt: fix check for system/busy console drivers when unregistering them

The default console driver (conswitchp) and busy drivers bound to a
console (as reported by con_is_bound()) shouldn't be unregistered.
System console drivers (without the CON_DRIVER_FLAG_MODULE flag) can be
unregistered, provided they are neither default nor busy. The current
code checks for the CON_DRIVER_FLAG_INIT flag but this doesn't make
sense: this flag is set for a driver whenever its associated console's
con_startup() function is called, which first happens when the console
driver is registered (so before the console gets bound) and gets cleared
when the console gets unbound. The purpose of this flag is to show if we
need to call con_startup() on a console before we use it.

Based on the above, do_unregister_con_driver() in its current form will
allow unregistering a console driver only if it was never bound, but
will refuse to unregister one that was bound and later unbound.

Fix this by dropping the CON_DRIVER_FLAG_INIT check, allowing
unregistering of any console driver provided that it's not the default
one and it's not busy.

v2:
- reword the third paragraph to clarify how the fix works (Peter Hurley)
v3:
- unchanged
v4:
- Allow unregistering a system console driver too, needed by i915 to
  unregister vgacon. Update commit description accordingly. (Daniel)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/vt/vt.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index f3fbbbca9bde..9c046fbe851b 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -3665,8 +3665,7 @@ int do_unregister_con_driver(const struct consw *csw)
 	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
 		struct con_driver *con_driver = &registered_con_driver[i];
 
-		if (con_driver->con == csw &&
-		    con_driver->flag & CON_DRIVER_FLAG_INIT) {
+		if (con_driver->con == csw) {
 			vtconsole_deinit_device(con_driver);
 			device_destroy(vtconsole_class,
 				       MKDEV(0, con_driver->node));
-- 
cgit v1.2.3-59-g8ed1b


From 4c215fe8e288c87b34c3d5bc910c77af586859d2 Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@intel.com>
Date: Tue, 16 Dec 2014 00:16:00 +0200
Subject: vt: fix locking around vt_bind/vt_unbind

Currently vt_bind and vt_unbind access at least the con_driver object
and registered_con_driver array without holding the console lock. Fix
this by locking around the whole function in each case.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/vt/vt.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 9c046fbe851b..5d36c2358b47 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -3318,11 +3318,8 @@ static int vt_bind(struct con_driver *con)
 		if (first == 0 && last == MAX_NR_CONSOLES -1)
 			deflt = 1;
 
-		if (first != -1) {
-			console_lock();
+		if (first != -1)
 			do_bind_con_driver(csw, first, last, deflt);
-			console_unlock();
-		}
 
 		first = -1;
 		last = -1;
@@ -3362,9 +3359,7 @@ static int vt_unbind(struct con_driver *con)
 			deflt = 1;
 
 		if (first != -1) {
-			console_lock();
 			ret = do_unbind_con_driver(csw, first, last, deflt);
-			console_unlock();
 			if (ret != 0)
 				return ret;
 		}
@@ -3394,11 +3389,15 @@ static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
 	struct con_driver *con = dev_get_drvdata(dev);
 	int bind = simple_strtoul(buf, NULL, 0);
 
+	console_lock();
+
 	if (bind)
 		vt_bind(con);
 	else
 		vt_unbind(con);
 
+	console_unlock();
+
 	return count;
 }
 
-- 
cgit v1.2.3-59-g8ed1b


From 19e3ae6b4f07a87822c1c9e7ed99d31860e701af Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nicolas.pitre@linaro.org>
Date: Fri, 23 Jan 2015 17:07:21 -0500
Subject: vt: provide notifications on selection changes

The vcs device's poll/fasync support relies on the vt notifier to signal
changes to the screen content.  Notifier invocations were missing for
changes that comes through the selection interface though.  Fix that.

Tested with BRLTTY 5.2.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Cc: Dave Mielke <dave@mielke.cc>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/vt/vt.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 5d36c2358b47..6e00572cbeb9 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -500,6 +500,7 @@ void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 #endif
 	if (DO_UPDATE(vc))
 		do_update_region(vc, (unsigned long) p, count);
+	notify_update(vc);
 }
 
 /* used by selection: complement pointer position */
@@ -516,6 +517,7 @@ void complement_pos(struct vc_data *vc, int offset)
 		scr_writew(old, screenpos(vc, old_offset, 1));
 		if (DO_UPDATE(vc))
 			vc->vc_sw->con_putc(vc, old, oldy, oldx);
+		notify_update(vc);
 	}
 
 	old_offset = offset;
@@ -533,8 +535,8 @@ void complement_pos(struct vc_data *vc, int offset)
 			oldy = (offset >> 1) / vc->vc_cols;
 			vc->vc_sw->con_putc(vc, new, oldy, oldx);
 		}
+		notify_update(vc);
 	}
-
 }
 
 static void insert_char(struct vc_data *vc, unsigned int nr)
-- 
cgit v1.2.3-59-g8ed1b


From 37480a05685ed5b8e1b9bf5e5c53b5810258b149 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Mon, 19 Jan 2015 13:05:03 -0500
Subject: tty: Prevent untrappable signals from malicious program

Commit 26df6d13406d1a5 ("tty: Add EXTPROC support for LINEMODE")
allows a process which has opened a pty master to send _any_ signal
to the process group of the pty slave. Although potentially
exploitable by a malicious program running a setuid program on
a pty slave, it's unknown if this exploit currently exists.

Limit to signals actually used.

Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Howard Chu <hyc@symas.com>
Cc: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: <stable@vger.kernel.org> # 2.6.36+
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/pty.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index a9d256d6e909..6e1f1505f04e 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -210,6 +210,9 @@ static int pty_signal(struct tty_struct *tty, int sig)
 {
 	struct pid *pgrp;
 
+	if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP)
+		return -EINVAL;
+
 	if (tty->link) {
 		pgrp = tty_get_pgrp(tty->link);
 		if (pgrp)
-- 
cgit v1.2.3-59-g8ed1b


From 4a8588a1cf867333187d9ff071e6fbdab587d194 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Sat, 10 Jan 2015 01:08:58 +0100
Subject: serial: fsl_lpuart: delete timer on shutdown

If the serial port gets closed while a RX transfer is in progress,
the timer might fire after the serial port shutdown finished. This
leads in a NULL pointer dereference:

[    7.508324] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[    7.516590] pgd = 86348000
[    7.519445] [00000000] *pgd=86179831, *pte=00000000, *ppte=00000000
[    7.526145] Internal error: Oops: 17 [#1] ARM
[    7.530611] Modules linked in:
[    7.533876] CPU: 0 PID: 123 Comm: systemd Not tainted 3.19.0-rc3-00004-g5b11ea7 #1778
[    7.541827] Hardware name: Freescale Vybrid VF610 (Device Tree)
[    7.547862] task: 861c3400 ti: 86ac8000 task.ti: 86ac8000
[    7.553392] PC is at lpuart_timer_func+0x24/0xf8
[    7.558127] LR is at lpuart_timer_func+0x20/0xf8
[    7.562857] pc : [<802df99c>]    lr : [<802df998>]    psr: 600b0113
[    7.562857] sp : 86ac9b90  ip : 86ac9b90  fp : 86ac9bbc
[    7.574467] r10: 80817180  r9 : 80817b98  r8 : 80817998
[    7.579803] r7 : 807acee0  r6 : 86989000  r5 : 00000100  r4 : 86997210
[    7.586444] r3 : 86ac8000  r2 : 86ac9bc0  r1 : 86997210  r0 : 00000000
[    7.593085] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[    7.600341] Control: 10c5387d  Table: 86348059  DAC: 00000015
[    7.606203] Process systemd (pid: 123, stack limit = 0x86ac8230)

Setup the timer on UART startup which allows to delete the timer
unconditionally on shutdown. This also saves the initialization
on each transfer.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Cc: stable <stable@vger.kernel.org> # 3.14
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/fsl_lpuart.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index e7cde3a9566d..29932b73c004 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -506,9 +506,6 @@ static inline void lpuart_prepare_rx(struct lpuart_port *sport)
 
 	spin_lock_irqsave(&sport->port.lock, flags);
 
-	init_timer(&sport->lpuart_timer);
-	sport->lpuart_timer.function = lpuart_timer_func;
-	sport->lpuart_timer.data = (unsigned long)sport;
 	sport->lpuart_timer.expires = jiffies + sport->dma_rx_timeout;
 	add_timer(&sport->lpuart_timer);
 
@@ -1106,6 +1103,8 @@ static int lpuart_startup(struct uart_port *port)
 		sport->lpuart_dma_use = false;
 	} else {
 		sport->lpuart_dma_use = true;
+		setup_timer(&sport->lpuart_timer, lpuart_timer_func,
+			    (unsigned long)sport);
 		temp = readb(port->membase + UARTCR5);
 		writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5);
 	}
@@ -1180,6 +1179,8 @@ static void lpuart_shutdown(struct uart_port *port)
 	devm_free_irq(port->dev, port->irq, sport);
 
 	if (sport->lpuart_dma_use) {
+		del_timer_sync(&sport->lpuart_timer);
+
 		lpuart_dma_tx_free(port);
 		lpuart_dma_rx_free(port);
 	}
-- 
cgit v1.2.3-59-g8ed1b


From 5f1437f61a0b351d25b528c159360da3d5e8c77b Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Sat, 10 Jan 2015 01:08:59 +0100
Subject: serial: fsl_lpuart: avoid new transfer while DMA is running

When the UART is in DMA receive mode (RDMAS set) and one character
just arrived while another interrupt is handled (e.g. TX), the RDRF
(receiver data register full flag) is set due to the water level of
1. But since the DMA will take care of this character, there is no
need to handle it by calling lpuart_prepare_rx. Handling it leads to
adding the RX timeout timer twice:

[   74.336698] Kernel BUG at 80053070 [verbose debug info unavailable]
[   74.342999] Internal error: Oops - BUG: 0 [#1] ARM0:00.00 khungtaskd
[   74.347817] Modules linked in:    0 S  0.0  0.0   0:00.00 writeback
[   74.350926] CPU: 0 PID: 0 Comm: swapper Not tainted 3.19.0-rc3-00001-g39d78e2 #1788
[   74.358617] Hardware name: Freescale Vybrid VF610 (Device Tree)t
[   74.364563] task: 807a7678 ti: 8079c000 task.ti: 8079c000 kblockd
[   74.370002] PC is at add_timer+0x24/0x28.0  0.0   0:00.09 kworker/u2:1
[   74.373960] LR is at lpuart_int+0x15c/0x3d8
[   74.378171] pc : [<80053070>]    lr : [<802e0d88>]    psr: a0010193
[   74.378171] sp : 8079de10  ip : 8079de20  fp : 8079de1c
[   74.389694] r10: 807d44c0  r9 : 8688c300  r8 : 00000013
[   74.394943] r7 : 20010193  r6 : 00000000  r5 : 000000a0  r4 : 86997210
[   74.401498] r3 : ffffa7da  r2 : 80817868  r1 : 86997210  r0 : 86997344
[   74.408052] Flags: NzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
[   74.415489] Control: 10c5387d  Table: 8611c059  DAC: 00000015
[   74.421265] Process swapper (pid: 0, stack limit = 0x8079c230)
...

Solve this by only execute the receiver path (lpuart_prepare_rx) if
the DMA receive mode (RDMAS) is not set. Also, make sure the flag is
cleared on initialization, in case it has been left set.

This can be best reproduced using UART as a serial console, then
running top while dd'ing data into the terminal.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Cc: stable <stable@vger.kernel.org> # 3.14
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/fsl_lpuart.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 29932b73c004..e95c4971327b 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -755,18 +755,18 @@ out:
 static irqreturn_t lpuart_int(int irq, void *dev_id)
 {
 	struct lpuart_port *sport = dev_id;
-	unsigned char sts;
+	unsigned char sts, crdma;
 
 	sts = readb(sport->port.membase + UARTSR1);
+	crdma = readb(sport->port.membase + UARTCR5);
 
-	if (sts & UARTSR1_RDRF) {
+	if (sts & UARTSR1_RDRF && !(crdma & UARTCR5_RDMAS)) {
 		if (sport->lpuart_dma_use)
 			lpuart_prepare_rx(sport);
 		else
 			lpuart_rxint(irq, dev_id);
 	}
-	if (sts & UARTSR1_TDRE &&
-		!(readb(sport->port.membase + UARTCR5) & UARTCR5_TDMAS)) {
+	if (sts & UARTSR1_TDRE && !(crdma & UARTCR5_TDMAS)) {
 		if (sport->lpuart_dma_use)
 			lpuart_pio_tx(sport);
 		else
@@ -1106,6 +1106,7 @@ static int lpuart_startup(struct uart_port *port)
 		setup_timer(&sport->lpuart_timer, lpuart_timer_func,
 			    (unsigned long)sport);
 		temp = readb(port->membase + UARTCR5);
+		temp &= ~UARTCR5_RDMAS;
 		writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5);
 	}
 
-- 
cgit v1.2.3-59-g8ed1b


From 4a818c4396cb8f0d00b48921654e7918ed54f17f Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Sat, 10 Jan 2015 09:33:45 +0100
Subject: serial: fsl_lpuart: move DMA channel request to probe

Move the DMA channel request to probe to avoid requesting the DMA
channel on each opening of the ttyLPx device. This also fixes a
potential issue that TX channel is not freed when only RX channel
allocation fails. The DMA channels are now handled independently,
so one could use UART with DMA only in TX direction for instance.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/fsl_lpuart.c | 96 +++++++++++++++++++----------------------
 1 file changed, 44 insertions(+), 52 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index e95c4971327b..0ea0af76cb9a 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -237,7 +237,8 @@ struct lpuart_port {
 	unsigned int		rxfifo_size;
 	bool			lpuart32;
 
-	bool			lpuart_dma_use;
+	bool			lpuart_dma_tx_use;
+	bool			lpuart_dma_rx_use;
 	struct dma_chan		*dma_tx_chan;
 	struct dma_chan		*dma_rx_chan;
 	struct dma_async_tx_descriptor  *dma_tx_desc;
@@ -568,7 +569,7 @@ static void lpuart_start_tx(struct uart_port *port)
 	temp = readb(port->membase + UARTCR2);
 	writeb(temp | UARTCR2_TIE, port->membase + UARTCR2);
 
-	if (sport->lpuart_dma_use) {
+	if (sport->lpuart_dma_tx_use) {
 		if (!uart_circ_empty(xmit) && !sport->dma_tx_in_progress)
 			lpuart_prepare_tx(sport);
 	} else {
@@ -761,13 +762,13 @@ static irqreturn_t lpuart_int(int irq, void *dev_id)
 	crdma = readb(sport->port.membase + UARTCR5);
 
 	if (sts & UARTSR1_RDRF && !(crdma & UARTCR5_RDMAS)) {
-		if (sport->lpuart_dma_use)
+		if (sport->lpuart_dma_rx_use)
 			lpuart_prepare_rx(sport);
 		else
 			lpuart_rxint(irq, dev_id);
 	}
 	if (sts & UARTSR1_TDRE && !(crdma & UARTCR5_TDMAS)) {
-		if (sport->lpuart_dma_use)
+		if (sport->lpuart_dma_tx_use)
 			lpuart_pio_tx(sport);
 		else
 			lpuart_txint(irq, dev_id);
@@ -950,26 +951,17 @@ static int lpuart_dma_tx_request(struct uart_port *port)
 {
 	struct lpuart_port *sport = container_of(port,
 					struct lpuart_port, port);
-	struct dma_chan *tx_chan;
 	struct dma_slave_config dma_tx_sconfig;
 	dma_addr_t dma_bus;
 	unsigned char *dma_buf;
 	int ret;
 
-	tx_chan  = dma_request_slave_channel(sport->port.dev, "tx");
-
-	if (!tx_chan) {
-		dev_err(sport->port.dev, "Dma tx channel request failed!\n");
-		return -ENODEV;
-	}
-
-	dma_bus = dma_map_single(tx_chan->device->dev,
+	dma_bus = dma_map_single(sport->dma_tx_chan->device->dev,
 				sport->port.state->xmit.buf,
 				UART_XMIT_SIZE, DMA_TO_DEVICE);
 
-	if (dma_mapping_error(tx_chan->device->dev, dma_bus)) {
+	if (dma_mapping_error(sport->dma_tx_chan->device->dev, dma_bus)) {
 		dev_err(sport->port.dev, "dma_map_single tx failed\n");
-		dma_release_channel(tx_chan);
 		return -ENOMEM;
 	}
 
@@ -978,16 +970,14 @@ static int lpuart_dma_tx_request(struct uart_port *port)
 	dma_tx_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
 	dma_tx_sconfig.dst_maxburst = sport->txfifo_size;
 	dma_tx_sconfig.direction = DMA_MEM_TO_DEV;
-	ret = dmaengine_slave_config(tx_chan, &dma_tx_sconfig);
+	ret = dmaengine_slave_config(sport->dma_tx_chan, &dma_tx_sconfig);
 
 	if (ret < 0) {
 		dev_err(sport->port.dev,
 				"Dma slave config failed, err = %d\n", ret);
-		dma_release_channel(tx_chan);
 		return ret;
 	}
 
-	sport->dma_tx_chan = tx_chan;
 	sport->dma_tx_buf_virt = dma_buf;
 	sport->dma_tx_buf_bus = dma_bus;
 	sport->dma_tx_in_progress = 0;
@@ -999,34 +989,24 @@ static int lpuart_dma_rx_request(struct uart_port *port)
 {
 	struct lpuart_port *sport = container_of(port,
 					struct lpuart_port, port);
-	struct dma_chan *rx_chan;
 	struct dma_slave_config dma_rx_sconfig;
 	dma_addr_t dma_bus;
 	unsigned char *dma_buf;
 	int ret;
 
-	rx_chan  = dma_request_slave_channel(sport->port.dev, "rx");
-
-	if (!rx_chan) {
-		dev_err(sport->port.dev, "Dma rx channel request failed!\n");
-		return -ENODEV;
-	}
-
 	dma_buf = devm_kzalloc(sport->port.dev,
 				FSL_UART_RX_DMA_BUFFER_SIZE, GFP_KERNEL);
 
 	if (!dma_buf) {
 		dev_err(sport->port.dev, "Dma rx alloc failed\n");
-		dma_release_channel(rx_chan);
 		return -ENOMEM;
 	}
 
-	dma_bus = dma_map_single(rx_chan->device->dev, dma_buf,
+	dma_bus = dma_map_single(sport->dma_rx_chan->device->dev, dma_buf,
 				FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
 
-	if (dma_mapping_error(rx_chan->device->dev, dma_bus)) {
+	if (dma_mapping_error(sport->dma_rx_chan->device->dev, dma_bus)) {
 		dev_err(sport->port.dev, "dma_map_single rx failed\n");
-		dma_release_channel(rx_chan);
 		return -ENOMEM;
 	}
 
@@ -1034,16 +1014,14 @@ static int lpuart_dma_rx_request(struct uart_port *port)
 	dma_rx_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
 	dma_rx_sconfig.src_maxburst = 1;
 	dma_rx_sconfig.direction = DMA_DEV_TO_MEM;
-	ret = dmaengine_slave_config(rx_chan, &dma_rx_sconfig);
+	ret = dmaengine_slave_config(sport->dma_rx_chan, &dma_rx_sconfig);
 
 	if (ret < 0) {
 		dev_err(sport->port.dev,
 				"Dma slave config failed, err = %d\n", ret);
-		dma_release_channel(rx_chan);
 		return ret;
 	}
 
-	sport->dma_rx_chan = rx_chan;
 	sport->dma_rx_buf_virt = dma_buf;
 	sport->dma_rx_buf_bus = dma_bus;
 	sport->dma_rx_in_progress = 0;
@@ -1055,31 +1033,24 @@ static void lpuart_dma_tx_free(struct uart_port *port)
 {
 	struct lpuart_port *sport = container_of(port,
 					struct lpuart_port, port);
-	struct dma_chan *dma_chan;
 
 	dma_unmap_single(sport->port.dev, sport->dma_tx_buf_bus,
 			UART_XMIT_SIZE, DMA_TO_DEVICE);
-	dma_chan = sport->dma_tx_chan;
-	sport->dma_tx_chan = NULL;
+
 	sport->dma_tx_buf_bus = 0;
 	sport->dma_tx_buf_virt = NULL;
-	dma_release_channel(dma_chan);
 }
 
 static void lpuart_dma_rx_free(struct uart_port *port)
 {
 	struct lpuart_port *sport = container_of(port,
 					struct lpuart_port, port);
-	struct dma_chan *dma_chan;
 
 	dma_unmap_single(sport->port.dev, sport->dma_rx_buf_bus,
 			FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
 
-	dma_chan = sport->dma_rx_chan;
-	sport->dma_rx_chan = NULL;
 	sport->dma_rx_buf_bus = 0;
 	sport->dma_rx_buf_virt = NULL;
-	dma_release_channel(dma_chan);
 }
 
 static int lpuart_startup(struct uart_port *port)
@@ -1098,17 +1069,21 @@ static int lpuart_startup(struct uart_port *port)
 	sport->rxfifo_size = 0x1 << (((temp >> UARTPFIFO_RXSIZE_OFF) &
 		UARTPFIFO_FIFOSIZE_MASK) + 1);
 
-	/* Whether use dma support by dma request results */
-	if (lpuart_dma_tx_request(port) || lpuart_dma_rx_request(port)) {
-		sport->lpuart_dma_use = false;
-	} else {
-		sport->lpuart_dma_use = true;
+	if (sport->dma_rx_chan && !lpuart_dma_rx_request(port)) {
+		sport->lpuart_dma_rx_use = true;
 		setup_timer(&sport->lpuart_timer, lpuart_timer_func,
 			    (unsigned long)sport);
+	} else
+		sport->lpuart_dma_rx_use = false;
+
+
+	if (sport->dma_tx_chan && !lpuart_dma_tx_request(port)) {
+		sport->lpuart_dma_tx_use = true;
 		temp = readb(port->membase + UARTCR5);
 		temp &= ~UARTCR5_RDMAS;
 		writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5);
-	}
+	} else
+		sport->lpuart_dma_tx_use = false;
 
 	ret = devm_request_irq(port->dev, port->irq, lpuart_int, 0,
 				DRIVER_NAME, sport);
@@ -1179,12 +1154,13 @@ static void lpuart_shutdown(struct uart_port *port)
 
 	devm_free_irq(port->dev, port->irq, sport);
 
-	if (sport->lpuart_dma_use) {
+	if (sport->lpuart_dma_rx_use) {
+		lpuart_dma_rx_free(&sport->port);
 		del_timer_sync(&sport->lpuart_timer);
-
-		lpuart_dma_tx_free(port);
-		lpuart_dma_rx_free(port);
 	}
+
+	if (sport->lpuart_dma_tx_use)
+		lpuart_dma_tx_free(&sport->port);
 }
 
 static void lpuart32_shutdown(struct uart_port *port)
@@ -1306,7 +1282,7 @@ lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
 	/* update the per-port timeout */
 	uart_update_timeout(port, termios->c_cflag, baud);
 
-	if (sport->lpuart_dma_use) {
+	if (sport->lpuart_dma_rx_use) {
 		/* Calculate delay for 1.5 DMA buffers */
 		sport->dma_rx_timeout = (sport->port.timeout - HZ / 50) *
 					FSL_UART_RX_DMA_BUFFER_SIZE * 3 /
@@ -1835,6 +1811,16 @@ static int lpuart_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	sport->dma_tx_chan = dma_request_slave_channel(sport->port.dev, "tx");
+	if (!sport->dma_tx_chan)
+		dev_info(sport->port.dev, "DMA tx channel request failed, "
+				"operating without tx DMA\n");
+
+	sport->dma_rx_chan = dma_request_slave_channel(sport->port.dev, "rx");
+	if (!sport->dma_rx_chan)
+		dev_info(sport->port.dev, "DMA rx channel request failed, "
+				"operating without rx DMA\n");
+
 	return 0;
 }
 
@@ -1846,6 +1832,12 @@ static int lpuart_remove(struct platform_device *pdev)
 
 	clk_disable_unprepare(sport->clk);
 
+	if (sport->dma_tx_chan)
+		dma_release_channel(sport->dma_tx_chan);
+
+	if (sport->dma_rx_chan)
+		dma_release_channel(sport->dma_rx_chan);
+
 	return 0;
 }
 
-- 
cgit v1.2.3-59-g8ed1b


From 011f5bde62890c39440859c8077a0a5a6aca316d Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Sat, 10 Jan 2015 09:33:46 +0100
Subject: serial: fsl_lpuart: update RX timer on successful DMA transfer

To end a DMA transfer which did not consume a whole buffer (e.g. one
character only), a RX timer is used. When lots of data are received
the DMA transfer will complete and setup another DMA transfer, which
in turn might complete again. In this cases, it is not necessary to
abort the DMA transfers using the RX timer. This change pushes the
RX timer timeout into the future each time a DMA transfer completed.

Aborting the DMA was not very harmful, since the next received
character lead to setup of another RX DMA.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/fsl_lpuart.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 0ea0af76cb9a..914f9a2a0157 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -462,6 +462,7 @@ static void lpuart_dma_rx_complete(void *arg)
 	unsigned long flags;
 
 	async_tx_ack(sport->dma_rx_desc);
+	mod_timer(&sport->lpuart_timer, jiffies + sport->dma_rx_timeout);
 
 	spin_lock_irqsave(&sport->port.lock, flags);
 
-- 
cgit v1.2.3-59-g8ed1b


From 2fe605df325abfa2d36f63469fa960cd40d8cf50 Mon Sep 17 00:00:00 2001
From: Yuan Yao <yao.yuan@freescale.com>
Date: Fri, 23 Jan 2015 17:48:54 +0800
Subject: serial: fsl-lpuart: disable interrupt when suspend

For power management support, we should disable TX and
TX interrupt so that kernel can prepare for deep sleep.

Retain RX and RX interrupt for wakeup the kernel when
receive the input character.

Signed-off-by: Yuan Yao <yao.yuan@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/fsl_lpuart.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 914f9a2a0157..f196a33e619b 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1846,6 +1846,19 @@ static int lpuart_remove(struct platform_device *pdev)
 static int lpuart_suspend(struct device *dev)
 {
 	struct lpuart_port *sport = dev_get_drvdata(dev);
+	unsigned long temp;
+
+	if (sport->lpuart32) {
+		/* disable Rx/Tx and interrupts */
+		temp = lpuart32_read(sport->port.membase + UARTCTRL);
+		temp &= ~(UARTCTRL_TE | UARTCTRL_TIE | UARTCTRL_TCIE);
+		lpuart32_write(temp, sport->port.membase + UARTCTRL);
+	} else {
+		/* disable Rx/Tx and interrupts */
+		temp = readb(sport->port.membase + UARTCR2);
+		temp &= ~(UARTCR2_TE | UARTCR2_TIE | UARTCR2_TCIE);
+		writeb(temp, sport->port.membase + UARTCR2);
+	}
 
 	uart_suspend_port(&lpuart_reg, &sport->port);
 
-- 
cgit v1.2.3-59-g8ed1b


From bfc2e07f910891516c8eeef61859fa17369fea9f Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Mon, 26 Jan 2015 01:10:16 +0100
Subject: tty: serial: fsl_lpuart: terminate DMA on buffer flush

On uart buffer flush, serial core resets the circular buffer.
If a DMA transfer is in progress at that time, the callback
lpuart_dma_tx_complete will move buffer's tail unconditionally,
hence tail moves beyond head. Use the flush_buffer hook to
terminate the DMA imeaditely and avoid lpuart_dma_tx_complete
being called in this situation.

This bug often showed up while shutdown and lead to duplicate
serial console output.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/fsl_lpuart.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index f196a33e619b..b1893f3f88f1 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -455,6 +455,15 @@ static int lpuart_dma_rx(struct lpuart_port *sport)
 	return 0;
 }
 
+static void lpuart_flush_buffer(struct uart_port *port)
+{
+	struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+	if (sport->lpuart_dma_tx_use) {
+		dmaengine_terminate_all(sport->dma_tx_chan);
+		sport->dma_tx_in_progress = 0;
+	}
+}
+
 static void lpuart_dma_rx_complete(void *arg)
 {
 	struct lpuart_port *sport = arg;
@@ -1496,6 +1505,7 @@ static struct uart_ops lpuart_pops = {
 	.release_port	= lpuart_release_port,
 	.config_port	= lpuart_config_port,
 	.verify_port	= lpuart_verify_port,
+	.flush_buffer	= lpuart_flush_buffer,
 };
 
 static struct uart_ops lpuart32_pops = {
@@ -1514,6 +1524,7 @@ static struct uart_ops lpuart32_pops = {
 	.release_port	= lpuart_release_port,
 	.config_port	= lpuart_config_port,
 	.verify_port	= lpuart_verify_port,
+	.flush_buffer	= lpuart_flush_buffer,
 };
 
 static struct lpuart_port *lpuart_ports[UART_NR];
-- 
cgit v1.2.3-59-g8ed1b


From 934084a9d2d95d0ce98ae8d1ec3bfe81c95c678c Mon Sep 17 00:00:00 2001
From: Fabio Estevam <fabio.estevam@freescale.com>
Date: Tue, 13 Jan 2015 10:00:26 -0200
Subject: serial: imx: Fix imx_flush_buffer()

When running an userspace program that does a 'tcflush(fd, TCIOFLUSH)' call
we still see the last received character in the URXD register afterwards.

Clear UCR2_SRST bit so that the UART FIFO is flushed properly.

Since UCR2_SRST also resets some UART registers, we need to save and restore
some of them.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Tested-by: Fugang Duan <B38611@freescale.com>
Acked-by: Jason Liu <r64343@freecale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 59d9ef10b085..0eb29b1c47ac 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1320,6 +1320,7 @@ static void imx_flush_buffer(struct uart_port *port)
 	struct imx_port *sport = (struct imx_port *)port;
 	struct scatterlist *sgl = &sport->tx_sgl[0];
 	unsigned long temp;
+	int i = 100, ubir, ubmr, ubrc, uts;
 
 	if (!sport->dma_chan_tx)
 		return;
@@ -1334,6 +1335,31 @@ static void imx_flush_buffer(struct uart_port *port)
 		writel(temp, sport->port.membase + UCR1);
 		sport->dma_is_txing = false;
 	}
+
+	/*
+	 * According to the Reference Manual description of the UART SRST bit:
+	 * "Reset the transmit and receive state machines,
+	 * all FIFOs and register USR1, USR2, UBIR, UBMR, UBRC, URXD, UTXD
+	 * and UTS[6-3]". As we don't need to restore the old values from
+	 * USR1, USR2, URXD, UTXD, only save/restore the other four registers
+	 */
+	ubir = readl(sport->port.membase + UBIR);
+	ubmr = readl(sport->port.membase + UBMR);
+	ubrc = readl(sport->port.membase + UBRC);
+	uts = readl(sport->port.membase + IMX21_UTS);
+
+	temp = readl(sport->port.membase + UCR2);
+	temp &= ~UCR2_SRST;
+	writel(temp, sport->port.membase + UCR2);
+
+	while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0))
+		udelay(1);
+
+	/* Restore the registers */
+	writel(ubir, sport->port.membase + UBIR);
+	writel(ubmr, sport->port.membase + UBMR);
+	writel(ubrc, sport->port.membase + UBRC);
+	writel(uts, sport->port.membase + IMX21_UTS);
 }
 
 static void
-- 
cgit v1.2.3-59-g8ed1b


From 874e52086f9f1b9f9bdfbf98cca8506b110b63ba Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Mon, 12 Jan 2015 15:17:22 +0200
Subject: x86, mrst: remove Moorestown specific serial drivers

Intel Moorestown platform support was removed few years ago. This is a follow
up which removes Moorestown specific code for the serial devices. It includes
mrst_max3110 and earlyprintk bits.

This was used on SFI (Medfield, Clovertrail) based platforms as well, though
new ones use normal serial interface for the console service.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: David Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/include/asm/intel-mid.h                   |   3 -
 arch/x86/kernel/early_printk.c                     |   5 -
 arch/x86/platform/intel-mid/device_libs/Makefile   |   2 -
 .../intel-mid/device_libs/platform_max3111.c       |  35 -
 .../platform/intel-mid/early_printk_intel_mid.c    | 220 +----
 drivers/tty/serial/Kconfig                         |  10 -
 drivers/tty/serial/Makefile                        |   1 -
 drivers/tty/serial/mrst_max3110.c                  | 909 ---------------------
 drivers/tty/serial/mrst_max3110.h                  |  61 --
 9 files changed, 4 insertions(+), 1242 deletions(-)
 delete mode 100644 arch/x86/platform/intel-mid/device_libs/platform_max3111.c
 delete mode 100644 drivers/tty/serial/mrst_max3110.c
 delete mode 100644 drivers/tty/serial/mrst_max3110.h

(limited to 'drivers/tty')

diff --git a/arch/x86/include/asm/intel-mid.h b/arch/x86/include/asm/intel-mid.h
index e34e097b6f9d..705d35708a50 100644
--- a/arch/x86/include/asm/intel-mid.h
+++ b/arch/x86/include/asm/intel-mid.h
@@ -136,9 +136,6 @@ extern enum intel_mid_timer_options intel_mid_timer_options;
 #define SFI_MTMR_MAX_NUM 8
 #define SFI_MRTC_MAX	8
 
-extern struct console early_mrst_console;
-extern void mrst_early_console_init(void);
-
 extern struct console early_hsu_console;
 extern void hsu_early_console_init(const char *);
 
diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
index 01d1c187c9f9..de814dfb8aee 100644
--- a/arch/x86/kernel/early_printk.c
+++ b/arch/x86/kernel/early_printk.c
@@ -226,11 +226,6 @@ static int __init setup_early_printk(char *buf)
 			early_console_register(&xenboot_console, keep);
 #endif
 #ifdef CONFIG_EARLY_PRINTK_INTEL_MID
-		if (!strncmp(buf, "mrst", 4)) {
-			mrst_early_console_init();
-			early_console_register(&early_mrst_console, keep);
-		}
-
 		if (!strncmp(buf, "hsu", 3)) {
 			hsu_early_console_init(buf + 3);
 			early_console_register(&early_hsu_console, keep);
diff --git a/arch/x86/platform/intel-mid/device_libs/Makefile b/arch/x86/platform/intel-mid/device_libs/Makefile
index af9307f2cc28..91ec9f8704bf 100644
--- a/arch/x86/platform/intel-mid/device_libs/Makefile
+++ b/arch/x86/platform/intel-mid/device_libs/Makefile
@@ -16,8 +16,6 @@ obj-$(subst m,y,$(CONFIG_INPUT_MPU3050)) += platform_mpu3050.o
 obj-$(subst m,y,$(CONFIG_INPUT_BMA150)) += platform_bma023.o
 obj-$(subst m,y,$(CONFIG_GPIO_PCA953X)) += platform_tca6416.o
 obj-$(subst m,y,$(CONFIG_DRM_MEDFIELD)) += platform_tc35876x.o
-# SPI Devices
-obj-$(subst m,y,$(CONFIG_SERIAL_MRST_MAX3110)) += platform_max3111.o
 # MISC Devices
 obj-$(subst m,y,$(CONFIG_KEYBOARD_GPIO)) += platform_gpio_keys.o
 obj-$(subst m,y,$(CONFIG_INTEL_MID_WATCHDOG)) += platform_wdt.o
diff --git a/arch/x86/platform/intel-mid/device_libs/platform_max3111.c b/arch/x86/platform/intel-mid/device_libs/platform_max3111.c
deleted file mode 100644
index afd1df94e0e5..000000000000
--- a/arch/x86/platform/intel-mid/device_libs/platform_max3111.c
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * platform_max3111.c: max3111 platform data initilization file
- *
- * (C) Copyright 2013 Intel Corporation
- * Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
- */
-
-#include <linux/gpio.h>
-#include <linux/spi/spi.h>
-#include <asm/intel-mid.h>
-
-static void __init *max3111_platform_data(void *info)
-{
-	struct spi_board_info *spi_info = info;
-	int intr = get_gpio_by_name("max3111_int");
-
-	spi_info->mode = SPI_MODE_0;
-	if (intr == -1)
-		return NULL;
-	spi_info->irq = intr + INTEL_MID_IRQ_OFFSET;
-	return NULL;
-}
-
-static const struct devs_id max3111_dev_id __initconst = {
-	.name = "spi_max3111",
-	.type = SFI_DEV_TYPE_SPI,
-	.get_platform_data = &max3111_platform_data,
-};
-
-sfi_device(max3111_dev_id);
diff --git a/arch/x86/platform/intel-mid/early_printk_intel_mid.c b/arch/x86/platform/intel-mid/early_printk_intel_mid.c
index e0bd082a80e0..4e720829ab90 100644
--- a/arch/x86/platform/intel-mid/early_printk_intel_mid.c
+++ b/arch/x86/platform/intel-mid/early_printk_intel_mid.c
@@ -10,15 +10,13 @@
  */
 
 /*
- * This file implements two early consoles named mrst and hsu.
- * mrst is based on Maxim3110 spi-uart device, it exists in both
- * Moorestown and Medfield platforms, while hsu is based on a High
- * Speed UART device which only exists in the Medfield platform
+ * This file implements early console named hsu.
+ * hsu is based on a High Speed UART device which only exists in the Medfield
+ * platform
  */
 
 #include <linux/serial_reg.h>
 #include <linux/serial_mfd.h>
-#include <linux/kmsg_dump.h>
 #include <linux/console.h>
 #include <linux/kernel.h>
 #include <linux/delay.h>
@@ -28,216 +26,6 @@
 #include <asm/pgtable.h>
 #include <asm/intel-mid.h>
 
-#define MRST_SPI_TIMEOUT		0x200000
-#define MRST_REGBASE_SPI0		0xff128000
-#define MRST_REGBASE_SPI1		0xff128400
-#define MRST_CLK_SPI0_REG		0xff11d86c
-
-/* Bit fields in CTRLR0 */
-#define SPI_DFS_OFFSET			0
-
-#define SPI_FRF_OFFSET			4
-#define SPI_FRF_SPI			0x0
-#define SPI_FRF_SSP			0x1
-#define SPI_FRF_MICROWIRE		0x2
-#define SPI_FRF_RESV			0x3
-
-#define SPI_MODE_OFFSET			6
-#define SPI_SCPH_OFFSET			6
-#define SPI_SCOL_OFFSET			7
-#define SPI_TMOD_OFFSET			8
-#define	SPI_TMOD_TR			0x0		/* xmit & recv */
-#define SPI_TMOD_TO			0x1		/* xmit only */
-#define SPI_TMOD_RO			0x2		/* recv only */
-#define SPI_TMOD_EPROMREAD		0x3		/* eeprom read mode */
-
-#define SPI_SLVOE_OFFSET		10
-#define SPI_SRL_OFFSET			11
-#define SPI_CFS_OFFSET			12
-
-/* Bit fields in SR, 7 bits */
-#define SR_MASK				0x7f		/* cover 7 bits */
-#define SR_BUSY				(1 << 0)
-#define SR_TF_NOT_FULL			(1 << 1)
-#define SR_TF_EMPT			(1 << 2)
-#define SR_RF_NOT_EMPT			(1 << 3)
-#define SR_RF_FULL			(1 << 4)
-#define SR_TX_ERR			(1 << 5)
-#define SR_DCOL				(1 << 6)
-
-struct dw_spi_reg {
-	u32	ctrl0;
-	u32	ctrl1;
-	u32	ssienr;
-	u32	mwcr;
-	u32	ser;
-	u32	baudr;
-	u32	txfltr;
-	u32	rxfltr;
-	u32	txflr;
-	u32	rxflr;
-	u32	sr;
-	u32	imr;
-	u32	isr;
-	u32	risr;
-	u32	txoicr;
-	u32	rxoicr;
-	u32	rxuicr;
-	u32	msticr;
-	u32	icr;
-	u32	dmacr;
-	u32	dmatdlr;
-	u32	dmardlr;
-	u32	idr;
-	u32	version;
-
-	/* Currently operates as 32 bits, though only the low 16 bits matter */
-	u32	dr;
-} __packed;
-
-#define dw_readl(dw, name)		__raw_readl(&(dw)->name)
-#define dw_writel(dw, name, val)	__raw_writel((val), &(dw)->name)
-
-/* Default use SPI0 register for mrst, we will detect Penwell and use SPI1 */
-static unsigned long mrst_spi_paddr = MRST_REGBASE_SPI0;
-
-static u32 *pclk_spi0;
-/* Always contains an accessible address, start with 0 */
-static struct dw_spi_reg *pspi;
-
-static struct kmsg_dumper dw_dumper;
-static int dumper_registered;
-
-static void dw_kmsg_dump(struct kmsg_dumper *dumper,
-			 enum kmsg_dump_reason reason)
-{
-	static char line[1024];
-	size_t len;
-
-	/* When run to this, we'd better re-init the HW */
-	mrst_early_console_init();
-
-	while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len))
-		early_mrst_console.write(&early_mrst_console, line, len);
-}
-
-/* Set the ratio rate to 115200, 8n1, IRQ disabled */
-static void max3110_write_config(void)
-{
-	u16 config;
-
-	config = 0xc001;
-	dw_writel(pspi, dr, config);
-}
-
-/* Translate char to a eligible word and send to max3110 */
-static void max3110_write_data(char c)
-{
-	u16 data;
-
-	data = 0x8000 | c;
-	dw_writel(pspi, dr, data);
-}
-
-void mrst_early_console_init(void)
-{
-	u32 ctrlr0 = 0;
-	u32 spi0_cdiv;
-	u32 freq; /* Freqency info only need be searched once */
-
-	/* Base clk is 100 MHz, the actual clk = 100M / (clk_divider + 1) */
-	pclk_spi0 = (void *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE,
-							MRST_CLK_SPI0_REG);
-	spi0_cdiv = ((*pclk_spi0) & 0xe00) >> 9;
-	freq = 100000000 / (spi0_cdiv + 1);
-
-	if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_PENWELL)
-		mrst_spi_paddr = MRST_REGBASE_SPI1;
-
-	pspi = (void *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE,
-						mrst_spi_paddr);
-
-	/* Disable SPI controller */
-	dw_writel(pspi, ssienr, 0);
-
-	/* Set control param, 8 bits, transmit only mode */
-	ctrlr0 = dw_readl(pspi, ctrl0);
-
-	ctrlr0 &= 0xfcc0;
-	ctrlr0 |= 0xf | (SPI_FRF_SPI << SPI_FRF_OFFSET)
-		      | (SPI_TMOD_TO << SPI_TMOD_OFFSET);
-	dw_writel(pspi, ctrl0, ctrlr0);
-
-	/*
-	 * Change the spi0 clk to comply with 115200 bps, use 100000 to
-	 * calculate the clk dividor to make the clock a little slower
-	 * than real baud rate.
-	 */
-	dw_writel(pspi, baudr, freq/100000);
-
-	/* Disable all INT for early phase */
-	dw_writel(pspi, imr, 0x0);
-
-	/* Set the cs to spi-uart */
-	dw_writel(pspi, ser, 0x2);
-
-	/* Enable the HW, the last step for HW init */
-	dw_writel(pspi, ssienr, 0x1);
-
-	/* Set the default configuration */
-	max3110_write_config();
-
-	/* Register the kmsg dumper */
-	if (!dumper_registered) {
-		dw_dumper.dump = dw_kmsg_dump;
-		kmsg_dump_register(&dw_dumper);
-		dumper_registered = 1;
-	}
-}
-
-/* Slave select should be called in the read/write function */
-static void early_mrst_spi_putc(char c)
-{
-	unsigned int timeout;
-	u32 sr;
-
-	timeout = MRST_SPI_TIMEOUT;
-	/* Early putc needs to make sure the TX FIFO is not full */
-	while (--timeout) {
-		sr = dw_readl(pspi, sr);
-		if (!(sr & SR_TF_NOT_FULL))
-			cpu_relax();
-		else
-			break;
-	}
-
-	if (!timeout)
-		pr_warn("MRST earlycon: timed out\n");
-	else
-		max3110_write_data(c);
-}
-
-/* Early SPI only uses polling mode */
-static void early_mrst_spi_write(struct console *con, const char *str,
-					unsigned n)
-{
-	int i;
-
-	for (i = 0; i < n && *str; i++) {
-		if (*str == '\n')
-			early_mrst_spi_putc('\r');
-		early_mrst_spi_putc(*str);
-		str++;
-	}
-}
-
-struct console early_mrst_console = {
-	.name =		"earlymrst",
-	.write =	early_mrst_spi_write,
-	.flags =	CON_PRINTBUFFER,
-	.index =	-1,
-};
-
 /*
  * Following is the early console based on Medfield HSU (High
  * Speed UART) device.
@@ -259,7 +47,7 @@ void hsu_early_console_init(const char *s)
 		port = clamp_val(port, 0, 2);
 
 	paddr = HSU_PORT_BASE + port * 0x80;
-	phsu = (void *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE, paddr);
+	phsu = (void __iomem *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE, paddr);
 
 	/* Disable FIFO */
 	writeb(0x0, phsu + UART_FCR);
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 96ec6cfd74e8..35677f75a1d8 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -482,16 +482,6 @@ config SERIAL_SA1100_CONSOLE
 	  your boot loader (lilo or loadlin) about how to pass options to the
 	  kernel at boot time.)
 
-config SERIAL_MRST_MAX3110
-	tristate "SPI UART driver for Max3110"
-	depends on SPI_DW_PCI
-	select SERIAL_CORE
-	select SERIAL_CORE_CONSOLE
-	help
-	  This is the UART protocol driver for the MAX3110 device on
-	  the Intel Moorestown platform. On other systems use the max3100
-	  driver.
-
 config SERIAL_MFD_HSU
 	tristate "Medfield High Speed UART support"
 	depends on PCI
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 770a19bb7fcb..a1c1085ef75c 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -77,7 +77,6 @@ obj-$(CONFIG_SERIAL_TIMBERDALE)	+= timbuart.o
 obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o
 obj-$(CONFIG_SERIAL_ALTERA_JTAGUART) += altera_jtaguart.o
 obj-$(CONFIG_SERIAL_VT8500) += vt8500_serial.o
-obj-$(CONFIG_SERIAL_MRST_MAX3110)	+= mrst_max3110.o
 obj-$(CONFIG_SERIAL_MFD_HSU)	+= mfd.o
 obj-$(CONFIG_SERIAL_IFX6X60)  	+= ifx6x60.o
 obj-$(CONFIG_SERIAL_PCH_UART)	+= pch_uart.o
diff --git a/drivers/tty/serial/mrst_max3110.c b/drivers/tty/serial/mrst_max3110.c
deleted file mode 100644
index 77239d5e620d..000000000000
--- a/drivers/tty/serial/mrst_max3110.c
+++ /dev/null
@@ -1,909 +0,0 @@
-/*
- *  mrst_max3110.c - spi uart protocol driver for Maxim 3110
- *
- * Copyright (c) 2008-2010, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-/*
- * Note:
- * 1. From Max3110 spec, the Rx FIFO has 8 words, while the Tx FIFO only has
- *    1 word. If SPI master controller doesn't support sclk frequency change,
- *    then the char need be sent out one by one with some delay
- *
- * 2. Currently only RX available interrupt is used, no need for waiting TXE
- *    interrupt for a low speed UART device
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#ifdef CONFIG_MAGIC_SYSRQ
-#define SUPPORT_SYSRQ
-#endif
-
-#include <linux/module.h>
-#include <linux/ioport.h>
-#include <linux/irq.h>
-#include <linux/init.h>
-#include <linux/console.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial_core.h>
-#include <linux/serial_reg.h>
-
-#include <linux/kthread.h>
-#include <linux/spi/spi.h>
-#include <linux/pm.h>
-
-#include "mrst_max3110.h"
-
-#define UART_TX_NEEDED 1
-#define CON_TX_NEEDED  2
-#define BIT_IRQ_PENDING    3
-
-struct uart_max3110 {
-	struct uart_port port;
-	struct spi_device *spi;
-	char name[SPI_NAME_SIZE];
-
-	wait_queue_head_t wq;
-	struct task_struct *main_thread;
-	struct task_struct *read_thread;
-	struct mutex thread_mutex;
-	struct mutex io_mutex;
-
-	u32 baud;
-	u16 cur_conf;
-	u8 clock;
-	u8 parity, word_7bits;
-	u16 irq;
-
-	unsigned long uart_flags;
-
-	/* console related */
-	struct circ_buf con_xmit;
-};
-
-/* global data structure, may need be removed */
-static struct uart_max3110 *pmax;
-
-static int receive_chars(struct uart_max3110 *max,
-				unsigned short *str, int len);
-static int max3110_read_multi(struct uart_max3110 *max);
-static void max3110_con_receive(struct uart_max3110 *max);
-
-static int max3110_write_then_read(struct uart_max3110 *max,
-		const void *txbuf, void *rxbuf, unsigned len, int always_fast)
-{
-	struct spi_device *spi = max->spi;
-	struct spi_message	message;
-	struct spi_transfer	x;
-	int ret;
-
-	mutex_lock(&max->io_mutex);
-	spi_message_init(&message);
-	memset(&x, 0, sizeof x);
-	x.len = len;
-	x.tx_buf = txbuf;
-	x.rx_buf = rxbuf;
-	spi_message_add_tail(&x, &message);
-
-	if (always_fast)
-		x.speed_hz = spi->max_speed_hz;
-	else if (max->baud)
-		x.speed_hz = max->baud;
-
-	/* Do the i/o */
-	ret = spi_sync(spi, &message);
-	mutex_unlock(&max->io_mutex);
-	return ret;
-}
-
-/* Write a 16b word to the device */
-static int max3110_out(struct uart_max3110 *max, const u16 out)
-{
-	void *buf;
-	u16 *obuf, *ibuf;
-	int ret;
-
-	buf = kzalloc(8, GFP_KERNEL | GFP_DMA);
-	if (!buf)
-		return -ENOMEM;
-
-	obuf = buf;
-	ibuf = buf + 4;
-	*obuf = out;
-	ret = max3110_write_then_read(max, obuf, ibuf, 2, 1);
-	if (ret) {
-		pr_warn("%s: get err msg %d when sending 0x%x\n",
-			__func__, ret, out);
-		goto exit;
-	}
-
-	receive_chars(max, ibuf, 1);
-
-exit:
-	kfree(buf);
-	return ret;
-}
-
-/*
- * This is usually used to read data from SPIC RX FIFO, which doesn't
- * need any delay like flushing character out.
- *
- * Return how many valide bytes are read back
- */
-static int max3110_read_multi(struct uart_max3110 *max)
-{
-	void *buf;
-	u16 *obuf, *ibuf;
-	int ret, blen;
-
-	blen = M3110_RX_FIFO_DEPTH * sizeof(u16);
-	buf = kzalloc(blen * 2, GFP_KERNEL | GFP_DMA);
-	if (!buf)
-		return 0;
-
-	/* tx/rx always have the same length */
-	obuf = buf;
-	ibuf = buf + blen;
-
-	if (max3110_write_then_read(max, obuf, ibuf, blen, 1)) {
-		kfree(buf);
-		return 0;
-	}
-
-	ret = receive_chars(max, ibuf, M3110_RX_FIFO_DEPTH);
-
-	kfree(buf);
-	return ret;
-}
-
-static void serial_m3110_con_putchar(struct uart_port *port, int ch)
-{
-	struct uart_max3110 *max =
-		container_of(port, struct uart_max3110, port);
-	struct circ_buf *xmit = &max->con_xmit;
-
-	if (uart_circ_chars_free(xmit)) {
-		xmit->buf[xmit->head] = (char)ch;
-		xmit->head = (xmit->head + 1) & (PAGE_SIZE - 1);
-	}
-}
-
-/*
- * Print a string to the serial port trying not to disturb
- * any possible real use of the port...
- *
- *	The console_lock must be held when we get here.
- */
-static void serial_m3110_con_write(struct console *co,
-				const char *s, unsigned int count)
-{
-	if (!pmax)
-		return;
-
-	uart_console_write(&pmax->port, s, count, serial_m3110_con_putchar);
-
-	if (!test_and_set_bit(CON_TX_NEEDED, &pmax->uart_flags))
-		wake_up(&pmax->wq);
-}
-
-static int __init
-serial_m3110_con_setup(struct console *co, char *options)
-{
-	struct uart_max3110 *max = pmax;
-	int baud = 115200;
-	int bits = 8;
-	int parity = 'n';
-	int flow = 'n';
-
-	pr_info("setting up console\n");
-
-	if (co->index == -1)
-		co->index = 0;
-
-	if (!max) {
-		pr_err("pmax is NULL, return\n");
-		return -ENODEV;
-	}
-
-	if (options)
-		uart_parse_options(options, &baud, &parity, &bits, &flow);
-
-	return uart_set_options(&max->port, co, baud, parity, bits, flow);
-}
-
-static struct tty_driver *serial_m3110_con_device(struct console *co,
-							int *index)
-{
-	struct uart_driver *p = co->data;
-	*index = co->index;
-	return p->tty_driver;
-}
-
-static struct uart_driver serial_m3110_reg;
-static struct console serial_m3110_console = {
-	.name		= "ttyS",
-	.write		= serial_m3110_con_write,
-	.device		= serial_m3110_con_device,
-	.setup		= serial_m3110_con_setup,
-	.flags		= CON_PRINTBUFFER,
-	.index		= -1,
-	.data		= &serial_m3110_reg,
-};
-
-static unsigned int serial_m3110_tx_empty(struct uart_port *port)
-{
-	return 1;
-}
-
-static void serial_m3110_stop_tx(struct uart_port *port)
-{
-	return;
-}
-
-/* stop_rx will be called in spin_lock env */
-static void serial_m3110_stop_rx(struct uart_port *port)
-{
-	return;
-}
-
-#define WORDS_PER_XFER	128
-static void send_circ_buf(struct uart_max3110 *max,
-				struct circ_buf *xmit)
-{
-	void *buf;
-	u16 *obuf, *ibuf;
-	int i, len, blen, dma_size, left, ret = 0;
-
-
-	dma_size = WORDS_PER_XFER * sizeof(u16) * 2;
-	buf = kzalloc(dma_size, GFP_KERNEL | GFP_DMA);
-	if (!buf)
-		return;
-	obuf = buf;
-	ibuf = buf + dma_size/2;
-
-	while (!uart_circ_empty(xmit)) {
-		left = uart_circ_chars_pending(xmit);
-		while (left) {
-			len = min(left, WORDS_PER_XFER);
-			blen = len * sizeof(u16);
-			memset(ibuf, 0, blen);
-
-			for (i = 0; i < len; i++) {
-				obuf[i] = (u8)xmit->buf[xmit->tail] | WD_TAG;
-				xmit->tail = (xmit->tail + 1) &
-						(UART_XMIT_SIZE - 1);
-			}
-
-			/* Fail to send msg to console is not very critical */
-
-			ret = max3110_write_then_read(max, obuf, ibuf, blen, 0);
-			if (ret)
-				pr_warn("%s: get err msg %d\n", __func__, ret);
-
-			receive_chars(max, ibuf, len);
-
-			max->port.icount.tx += len;
-			left -= len;
-		}
-	}
-
-	kfree(buf);
-}
-
-static void transmit_char(struct uart_max3110 *max)
-{
-	struct uart_port *port = &max->port;
-	struct circ_buf *xmit = &port->state->xmit;
-
-	if (uart_circ_empty(xmit) || uart_tx_stopped(port))
-		return;
-
-	send_circ_buf(max, xmit);
-
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(port);
-
-	if (uart_circ_empty(xmit))
-		serial_m3110_stop_tx(port);
-}
-
-/*
- * This will be called by uart_write() and tty_write, can't
- * go to sleep
- */
-static void serial_m3110_start_tx(struct uart_port *port)
-{
-	struct uart_max3110 *max =
-		container_of(port, struct uart_max3110, port);
-
-	if (!test_and_set_bit(UART_TX_NEEDED, &max->uart_flags))
-		wake_up(&max->wq);
-}
-
-static int
-receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
-{
-	struct uart_port *port = &max->port;
-	struct tty_port *tport;
-	char buf[M3110_RX_FIFO_DEPTH];
-	int r, w, usable;
-
-	/* If uart is not opened, just return */
-	if (!port->state)
-		return 0;
-
-	tport = &port->state->port;
-
-	for (r = 0, w = 0; r < len; r++) {
-		if (str[r] & MAX3110_BREAK &&
-		    uart_handle_break(port))
-			continue;
-
-		if (str[r] & MAX3110_READ_DATA_AVAILABLE) {
-			if (uart_handle_sysrq_char(port, str[r] & 0xff))
-				continue;
-
-			buf[w++] = str[r] & 0xff;
-		}
-	}
-
-	if (!w)
-		return 0;
-
-	for (r = 0; w; r += usable, w -= usable) {
-		usable = tty_buffer_request_room(tport, w);
-		if (usable) {
-			tty_insert_flip_string(tport, buf + r, usable);
-			port->icount.rx += usable;
-		}
-	}
-	tty_flip_buffer_push(tport);
-
-	return r;
-}
-
-/*
- * This routine will be used in read_thread or RX IRQ handling,
- * it will first do one round buffer read(8 words), if there is some
- * valid RX data, will try to read 5 more rounds till all data
- * is read out.
- *
- * Use stack space as data buffer to save some system load, and chose
- * 504 Btyes as a threadhold to do a bulk push to upper tty layer when
- * receiving bulk data, a much bigger buffer may cause stack overflow
- */
-static void max3110_con_receive(struct uart_max3110 *max)
-{
-	int loop = 1, num;
-
-	do {
-		num = max3110_read_multi(max);
-
-		if (num) {
-			loop = 5;
-		}
-	} while (--loop);
-}
-
-static int max3110_main_thread(void *_max)
-{
-	struct uart_max3110 *max = _max;
-	wait_queue_head_t *wq = &max->wq;
-	int ret = 0;
-	struct circ_buf *xmit = &max->con_xmit;
-
-	pr_info("start main thread\n");
-
-	do {
-		wait_event_interruptible(*wq,
-				max->uart_flags || kthread_should_stop());
-
-		mutex_lock(&max->thread_mutex);
-
-		if (test_and_clear_bit(BIT_IRQ_PENDING, &max->uart_flags))
-			max3110_con_receive(max);
-
-		/* first handle console output */
-		if (test_and_clear_bit(CON_TX_NEEDED, &max->uart_flags))
-			send_circ_buf(max, xmit);
-
-		/* handle uart output */
-		if (test_and_clear_bit(UART_TX_NEEDED, &max->uart_flags))
-			transmit_char(max);
-
-		mutex_unlock(&max->thread_mutex);
-
-	} while (!kthread_should_stop());
-
-	return ret;
-}
-
-static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
-{
-	struct uart_max3110 *max = dev_id;
-
-	/* max3110's irq is a falling edge, not level triggered,
-	 * so no need to disable the irq */
-
-	if (!test_and_set_bit(BIT_IRQ_PENDING, &max->uart_flags))
-		wake_up(&max->wq);
-
-	return IRQ_HANDLED;
-}
-
-/* if don't use RX IRQ, then need a thread to polling read */
-static int max3110_read_thread(void *_max)
-{
-	struct uart_max3110 *max = _max;
-
-	pr_info("start read thread\n");
-	do {
-		/*
-		 * If can't acquire the mutex, it means the main thread
-		 * is running which will also perform the rx job
-		 */
-		if (mutex_trylock(&max->thread_mutex)) {
-			max3110_con_receive(max);
-			mutex_unlock(&max->thread_mutex);
-		}
-
-		set_current_state(TASK_INTERRUPTIBLE);
-		schedule_timeout(HZ / 20);
-	} while (!kthread_should_stop());
-
-	return 0;
-}
-
-static int serial_m3110_startup(struct uart_port *port)
-{
-	struct uart_max3110 *max =
-		container_of(port, struct uart_max3110, port);
-	u16 config = 0;
-	int ret = 0;
-
-	if (port->line != 0) {
-		pr_err("uart port startup failed\n");
-		return -1;
-	}
-
-	/* Disable all IRQ and config it to 115200, 8n1 */
-	config = WC_TAG | WC_FIFO_ENABLE
-			| WC_1_STOPBITS
-			| WC_8BIT_WORD
-			| WC_BAUD_DR2;
-
-	/* as we use thread to handle tx/rx, need set low latency */
-	port->state->port.low_latency = 1;
-
-	if (max->irq) {
-		/* Enable RX IRQ only */
-		config |= WC_RXA_IRQ_ENABLE;
-	} else {
-		/* If IRQ is disabled, start a read thread for input data */
-		max->read_thread =
-			kthread_run(max3110_read_thread, max, "max3110_read");
-		if (IS_ERR(max->read_thread)) {
-			ret = PTR_ERR(max->read_thread);
-			max->read_thread = NULL;
-			pr_err("Can't create read thread!\n");
-			return ret;
-		}
-	}
-
-	ret = max3110_out(max, config);
-	if (ret) {
-		if (max->read_thread)
-			kthread_stop(max->read_thread);
-		max->read_thread = NULL;
-		return ret;
-	}
-
-	max->cur_conf = config;
-	return 0;
-}
-
-static void serial_m3110_shutdown(struct uart_port *port)
-{
-	struct uart_max3110 *max =
-		container_of(port, struct uart_max3110, port);
-	u16 config;
-
-	if (max->read_thread) {
-		kthread_stop(max->read_thread);
-		max->read_thread = NULL;
-	}
-
-	/* Disable interrupts from this port */
-	config = WC_TAG | WC_SW_SHDI;
-	max3110_out(max, config);
-}
-
-static void serial_m3110_release_port(struct uart_port *port)
-{
-}
-
-static int serial_m3110_request_port(struct uart_port *port)
-{
-	return 0;
-}
-
-static void serial_m3110_config_port(struct uart_port *port, int flags)
-{
-	port->type = PORT_MAX3100;
-}
-
-static int
-serial_m3110_verify_port(struct uart_port *port, struct serial_struct *ser)
-{
-	/* we don't want the core code to modify any port params */
-	return -EINVAL;
-}
-
-
-static const char *serial_m3110_type(struct uart_port *port)
-{
-	struct uart_max3110 *max =
-		container_of(port, struct uart_max3110, port);
-	return max->name;
-}
-
-static void
-serial_m3110_set_termios(struct uart_port *port, struct ktermios *termios,
-		       struct ktermios *old)
-{
-	struct uart_max3110 *max =
-		container_of(port, struct uart_max3110, port);
-	unsigned char cval;
-	unsigned int baud, parity = 0;
-	int clk_div = -1;
-	u16 new_conf = max->cur_conf;
-
-	switch (termios->c_cflag & CSIZE) {
-	case CS7:
-		cval = UART_LCR_WLEN7;
-		new_conf |= WC_7BIT_WORD;
-		break;
-	default:
-		/* We only support CS7 & CS8 */
-		termios->c_cflag &= ~CSIZE;
-		termios->c_cflag |= CS8;
-	case CS8:
-		cval = UART_LCR_WLEN8;
-		new_conf |= WC_8BIT_WORD;
-		break;
-	}
-
-	baud = uart_get_baud_rate(port, termios, old, 0, 230400);
-
-	/* First calc the div for 1.8MHZ clock case */
-	switch (baud) {
-	case 300:
-		clk_div = WC_BAUD_DR384;
-		break;
-	case 600:
-		clk_div = WC_BAUD_DR192;
-		break;
-	case 1200:
-		clk_div = WC_BAUD_DR96;
-		break;
-	case 2400:
-		clk_div = WC_BAUD_DR48;
-		break;
-	case 4800:
-		clk_div = WC_BAUD_DR24;
-		break;
-	case 9600:
-		clk_div = WC_BAUD_DR12;
-		break;
-	case 19200:
-		clk_div = WC_BAUD_DR6;
-		break;
-	case 38400:
-		clk_div = WC_BAUD_DR3;
-		break;
-	case 57600:
-		clk_div = WC_BAUD_DR2;
-		break;
-	case 115200:
-		clk_div = WC_BAUD_DR1;
-		break;
-	case 230400:
-		if (max->clock & MAX3110_HIGH_CLK)
-			break;
-	default:
-		/* Pick the previous baud rate */
-		baud = max->baud;
-		clk_div = max->cur_conf & WC_BAUD_DIV_MASK;
-		tty_termios_encode_baud_rate(termios, baud, baud);
-	}
-
-	if (max->clock & MAX3110_HIGH_CLK) {
-		clk_div += 1;
-		/* High clk version max3110 doesn't support B300 */
-		if (baud == 300) {
-			baud = 600;
-			clk_div = WC_BAUD_DR384;
-		}
-		if (baud == 230400)
-			clk_div = WC_BAUD_DR1;
-		tty_termios_encode_baud_rate(termios, baud, baud);
-	}
-
-	new_conf = (new_conf & ~WC_BAUD_DIV_MASK) | clk_div;
-
-	if (unlikely(termios->c_cflag & CMSPAR))
-		termios->c_cflag &= ~CMSPAR;
-
-	if (termios->c_cflag & CSTOPB)
-		new_conf |= WC_2_STOPBITS;
-	else
-		new_conf &= ~WC_2_STOPBITS;
-
-	if (termios->c_cflag & PARENB) {
-		new_conf |= WC_PARITY_ENABLE;
-		parity |= UART_LCR_PARITY;
-	} else
-		new_conf &= ~WC_PARITY_ENABLE;
-
-	if (!(termios->c_cflag & PARODD))
-		parity |= UART_LCR_EPAR;
-	max->parity = parity;
-
-	uart_update_timeout(port, termios->c_cflag, baud);
-
-	new_conf |= WC_TAG;
-	if (new_conf != max->cur_conf) {
-		if (!max3110_out(max, new_conf)) {
-			max->cur_conf = new_conf;
-			max->baud = baud;
-		}
-	}
-}
-
-/* Don't handle hw handshaking */
-static unsigned int serial_m3110_get_mctrl(struct uart_port *port)
-{
-	return TIOCM_DSR | TIOCM_CAR | TIOCM_DSR;
-}
-
-static void serial_m3110_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
-}
-
-static void serial_m3110_break_ctl(struct uart_port *port, int break_state)
-{
-}
-
-static void serial_m3110_pm(struct uart_port *port, unsigned int state,
-			unsigned int oldstate)
-{
-}
-
-static struct uart_ops serial_m3110_ops = {
-	.tx_empty	= serial_m3110_tx_empty,
-	.set_mctrl	= serial_m3110_set_mctrl,
-	.get_mctrl	= serial_m3110_get_mctrl,
-	.stop_tx	= serial_m3110_stop_tx,
-	.start_tx	= serial_m3110_start_tx,
-	.stop_rx	= serial_m3110_stop_rx,
-	.break_ctl	= serial_m3110_break_ctl,
-	.startup	= serial_m3110_startup,
-	.shutdown	= serial_m3110_shutdown,
-	.set_termios	= serial_m3110_set_termios,
-	.pm		= serial_m3110_pm,
-	.type		= serial_m3110_type,
-	.release_port	= serial_m3110_release_port,
-	.request_port	= serial_m3110_request_port,
-	.config_port	= serial_m3110_config_port,
-	.verify_port	= serial_m3110_verify_port,
-};
-
-static struct uart_driver serial_m3110_reg = {
-	.owner		= THIS_MODULE,
-	.driver_name	= "MRST serial",
-	.dev_name	= "ttyS",
-	.major		= TTY_MAJOR,
-	.minor		= 64,
-	.nr		= 1,
-	.cons		= &serial_m3110_console,
-};
-
-#ifdef CONFIG_PM_SLEEP
-static int serial_m3110_suspend(struct device *dev)
-{
-	struct spi_device *spi = to_spi_device(dev);
-	struct uart_max3110 *max = spi_get_drvdata(spi);
-
-	if (max->irq > 0)
-		disable_irq(max->irq);
-	uart_suspend_port(&serial_m3110_reg, &max->port);
-	max3110_out(max, max->cur_conf | WC_SW_SHDI);
-	return 0;
-}
-
-static int serial_m3110_resume(struct device *dev)
-{
-	struct spi_device *spi = to_spi_device(dev);
-	struct uart_max3110 *max = spi_get_drvdata(spi);
-
-	max3110_out(max, max->cur_conf);
-	uart_resume_port(&serial_m3110_reg, &max->port);
-	if (max->irq > 0)
-		enable_irq(max->irq);
-	return 0;
-}
-
-static SIMPLE_DEV_PM_OPS(serial_m3110_pm_ops, serial_m3110_suspend,
-			serial_m3110_resume);
-#define SERIAL_M3110_PM_OPS (&serial_m3110_pm_ops)
-
-#else
-#define SERIAL_M3110_PM_OPS NULL
-#endif
-
-static int serial_m3110_probe(struct spi_device *spi)
-{
-	struct uart_max3110 *max;
-	void *buffer;
-	u16 res;
-	int ret = 0;
-
-	max = kzalloc(sizeof(*max), GFP_KERNEL);
-	if (!max)
-		return -ENOMEM;
-
-	/* Set spi info */
-	spi->bits_per_word = 16;
-	max->clock = MAX3110_HIGH_CLK;
-
-	spi_setup(spi);
-
-	max->port.type = PORT_MAX3100;
-	max->port.fifosize = 2;		/* Only have 16b buffer */
-	max->port.ops = &serial_m3110_ops;
-	max->port.line = 0;
-	max->port.dev = &spi->dev;
-	max->port.uartclk = 115200;
-
-	max->spi = spi;
-	strcpy(max->name, spi->modalias);
-	max->irq = (u16)spi->irq;
-
-	mutex_init(&max->thread_mutex);
-	mutex_init(&max->io_mutex);
-
-	max->word_7bits = 0;
-	max->parity = 0;
-	max->baud = 0;
-
-	max->cur_conf = 0;
-	max->uart_flags = 0;
-
-	/* Check if reading configuration register returns something sane */
-
-	res = RC_TAG;
-	ret = max3110_write_then_read(max, (u8 *)&res, (u8 *)&res, 2, 0);
-	if (ret < 0 || res == 0 || res == 0xffff) {
-		dev_dbg(&spi->dev, "MAX3111 deemed not present (conf reg %04x)",
-									res);
-		ret = -ENODEV;
-		goto err_get_page;
-	}
-
-	buffer = (void *)__get_free_page(GFP_KERNEL);
-	if (!buffer) {
-		ret = -ENOMEM;
-		goto err_get_page;
-	}
-	max->con_xmit.buf = buffer;
-	max->con_xmit.head = 0;
-	max->con_xmit.tail = 0;
-
-	init_waitqueue_head(&max->wq);
-
-	max->main_thread = kthread_run(max3110_main_thread,
-					max, "max3110_main");
-	if (IS_ERR(max->main_thread)) {
-		ret = PTR_ERR(max->main_thread);
-		goto err_kthread;
-	}
-
-	if (max->irq) {
-		ret = request_irq(max->irq, serial_m3110_irq,
-				IRQ_TYPE_EDGE_FALLING, "max3110", max);
-		if (ret) {
-			max->irq = 0;
-			dev_warn(&spi->dev,
-			"unable to allocate IRQ, will use polling method\n");
-		}
-	}
-
-	spi_set_drvdata(spi, max);
-	pmax = max;
-
-	/* Give membase a psudo value to pass serial_core's check */
-	max->port.membase = (unsigned char __iomem *)0xff110000;
-	uart_add_one_port(&serial_m3110_reg, &max->port);
-
-	return 0;
-
-err_kthread:
-	free_page((unsigned long)buffer);
-err_get_page:
-	kfree(max);
-	return ret;
-}
-
-static int serial_m3110_remove(struct spi_device *dev)
-{
-	struct uart_max3110 *max = spi_get_drvdata(dev);
-
-	if (!max)
-		return 0;
-
-	uart_remove_one_port(&serial_m3110_reg, &max->port);
-
-	free_page((unsigned long)max->con_xmit.buf);
-
-	if (max->irq)
-		free_irq(max->irq, max);
-
-	if (max->main_thread)
-		kthread_stop(max->main_thread);
-
-	kfree(max);
-	return 0;
-}
-
-static struct spi_driver uart_max3110_driver = {
-	.driver = {
-			.name	= "spi_max3111",
-			.owner	= THIS_MODULE,
-			.pm	= SERIAL_M3110_PM_OPS,
-	},
-	.probe		= serial_m3110_probe,
-	.remove		= serial_m3110_remove,
-};
-
-static int __init serial_m3110_init(void)
-{
-	int ret = 0;
-
-	ret = uart_register_driver(&serial_m3110_reg);
-	if (ret)
-		return ret;
-
-	ret = spi_register_driver(&uart_max3110_driver);
-	if (ret)
-		uart_unregister_driver(&serial_m3110_reg);
-
-	return ret;
-}
-
-static void __exit serial_m3110_exit(void)
-{
-	spi_unregister_driver(&uart_max3110_driver);
-	uart_unregister_driver(&serial_m3110_reg);
-}
-
-module_init(serial_m3110_init);
-module_exit(serial_m3110_exit);
-
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("spi:max3110-uart");
diff --git a/drivers/tty/serial/mrst_max3110.h b/drivers/tty/serial/mrst_max3110.h
deleted file mode 100644
index 35af0739513b..000000000000
--- a/drivers/tty/serial/mrst_max3110.h
+++ /dev/null
@@ -1,61 +0,0 @@
-#ifndef _MRST_MAX3110_H
-#define _MRST_MAX3110_H
-
-#define MAX3110_HIGH_CLK	0x1	/* 3.6864 MHZ */
-#define MAX3110_LOW_CLK		0x0	/* 1.8432 MHZ */
-
-/* status bits for all 4 MAX3110 operate modes */
-#define MAX3110_READ_DATA_AVAILABLE	(1 << 15)
-#define MAX3110_WRITE_BUF_EMPTY		(1 << 14)
-#define MAX3110_BREAK			(1 << 10)
-
-#define WC_TAG			(3 << 14)
-#define RC_TAG			(1 << 14)
-#define WD_TAG			(2 << 14)
-#define RD_TAG			(0 << 14)
-
-/* bits def for write configuration */
-#define WC_FIFO_ENABLE_MASK	(1 << 13)
-#define WC_FIFO_ENABLE		(0 << 13)
-
-#define WC_SW_SHDI		(1 << 12)
-
-#define WC_IRQ_MASK		(0xF << 8)
-#define WC_TXE_IRQ_ENABLE	(1 << 11)	/* TX empty irq */
-#define WC_RXA_IRQ_ENABLE	(1 << 10)	/* RX available irq */
-#define WC_PAR_HIGH_IRQ_ENABLE	(1 << 9)
-#define WC_REC_ACT_IRQ_ENABLE	(1 << 8)
-
-#define WC_IRDA_ENABLE		(1 << 7)
-
-#define WC_STOPBITS_MASK	(1 << 6)
-#define WC_2_STOPBITS		(1 << 6)
-#define WC_1_STOPBITS		(0 << 6)
-
-#define WC_PARITY_ENABLE_MASK	(1 << 5)
-#define WC_PARITY_ENABLE	(1 << 5)
-
-#define WC_WORDLEN_MASK		(1 << 4)
-#define WC_7BIT_WORD		(1 << 4)
-#define WC_8BIT_WORD		(0 << 4)
-
-#define WC_BAUD_DIV_MASK	(0xF)
-#define WC_BAUD_DR1		(0x0)
-#define WC_BAUD_DR2		(0x1)
-#define WC_BAUD_DR4		(0x2)
-#define WC_BAUD_DR8		(0x3)
-#define WC_BAUD_DR16		(0x4)
-#define WC_BAUD_DR32		(0x5)
-#define WC_BAUD_DR64		(0x6)
-#define WC_BAUD_DR128		(0x7)
-#define WC_BAUD_DR3		(0x8)
-#define WC_BAUD_DR6		(0x9)
-#define WC_BAUD_DR12		(0xA)
-#define WC_BAUD_DR24		(0xB)
-#define WC_BAUD_DR48		(0xC)
-#define WC_BAUD_DR96		(0xD)
-#define WC_BAUD_DR192		(0xE)
-#define WC_BAUD_DR384		(0xF)
-
-#define M3110_RX_FIFO_DEPTH	8
-#endif
-- 
cgit v1.2.3-59-g8ed1b


From 0a0d412abe473c37ddec8d3f6c0b84c58f1bb061 Mon Sep 17 00:00:00 2001
From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Date: Mon, 12 Jan 2015 13:47:46 +0200
Subject: serial: 8250_pci: remove one useless explicit type conversion

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_pci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index d1f8dc6aabcb..daf2c82984e9 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -221,13 +221,13 @@ pci_hp_diva_setup(struct serial_private *priv,
  */
 static int pci_inteli960ni_init(struct pci_dev *dev)
 {
-	unsigned long oldval;
+	u32 oldval;
 
 	if (!(dev->subsystem_device & 0x1000))
 		return -ENODEV;
 
 	/* is firmware started? */
-	pci_read_config_dword(dev, 0x44, (void *)&oldval);
+	pci_read_config_dword(dev, 0x44, &oldval);
 	if (oldval == 0x00001000L) { /* RESET value */
 		dev_dbg(&dev->dev, "Local i960 firmware missing\n");
 		return -ENODEV;
-- 
cgit v1.2.3-59-g8ed1b


From 4daba33466a81197e65c1a86cc1e1d1ca4e70939 Mon Sep 17 00:00:00 2001
From: Pramod Gurav <pramod.gurav@smartplayin.com>
Date: Mon, 12 Jan 2015 19:15:32 +0530
Subject: tty: serial: msm_serial: code cleanup in msm_console_setup

The change does following:
 - baud, flow, bits, parity were being overwritten as they were
   being reinitialized after parsing.  Initialize them when they are
   declared so that user provided setting are not overwritten.
 - msm_set_baud_rate() is anyway called in uart_set_options when it calls
   msm_set_termios(). msm_reset() is called when we change the baud rate.
   Hence doing away with both of these calls.
 - CR_CMD_PROTECTION_EN and CR_TX_ENABLE settings are done in msm_set_baud_rate.
   So do away with this here.

Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/msm_serial.c | 24 ++++--------------------
 1 file changed, 4 insertions(+), 20 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index c88b522ccd73..a0cc6e08552f 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -920,14 +920,15 @@ static void msm_console_write(struct console *co, const char *s,
 static int __init msm_console_setup(struct console *co, char *options)
 {
 	struct uart_port *port;
-	struct msm_port *msm_port;
-	int baud = 0, flow, bits, parity;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
 
 	if (unlikely(co->index >= UART_NR || co->index < 0))
 		return -ENXIO;
 
 	port = get_port_from_line(co->index);
-	msm_port = UART_TO_MSM(port);
 
 	if (unlikely(!port->membase))
 		return -ENXIO;
@@ -937,23 +938,6 @@ static int __init msm_console_setup(struct console *co, char *options)
 	if (options)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);
 
-	bits = 8;
-	parity = 'n';
-	flow = 'n';
-	msm_write(port, UART_MR2_BITS_PER_CHAR_8 | UART_MR2_STOP_BIT_LEN_ONE,
-		  UART_MR2);	/* 8N1 */
-
-	if (baud < 300 || baud > 115200)
-		baud = 115200;
-	msm_set_baud_rate(port, baud);
-
-	msm_reset(port);
-
-	if (msm_port->is_uartdm) {
-		msm_write(port, UART_CR_CMD_PROTECTION_EN, UART_CR);
-		msm_write(port, UART_CR_TX_ENABLE, UART_CR);
-	}
-
 	pr_info("msm_serial: console setup on port #%d\n", port->line);
 
 	return uart_set_options(port, co, baud, parity, bits, flow);
-- 
cgit v1.2.3-59-g8ed1b


From 2f7f558c222bc0ed617aa9888d0043a9aeeba253 Mon Sep 17 00:00:00 2001
From: Pramod Gurav <pramod.gurav@smartplayin.com>
Date: Mon, 12 Jan 2015 19:22:12 +0530
Subject: tty: serial: msm_serial: Remove console unregistration from driver
 exit.

unregister_console() will be called from uart_remove_one_port() while
removing the platform driver. So not necessary to call it in driver
exit path.

Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/msm_serial.c | 3 ---
 1 file changed, 3 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index a0cc6e08552f..b73889c8ed4b 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -1126,9 +1126,6 @@ static int __init msm_serial_init(void)
 
 static void __exit msm_serial_exit(void)
 {
-#ifdef CONFIG_SERIAL_MSM_CONSOLE
-	unregister_console(&msm_console);
-#endif
 	platform_driver_unregister(&msm_platform_driver);
 	uart_unregister_driver(&msm_uart_driver);
 }
-- 
cgit v1.2.3-59-g8ed1b


From ee15947cf69a9ab035089670ee76160678eb5aa2 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Thu, 22 Jan 2015 11:50:25 -0500
Subject: serial: 8250_pnp: Enable PNP_CONSOLE for console ports

When the kernel command line parameter, no_console_suspend, is used,
the console should continue to output console messages during and
after system suspend. For a serial console, the serial core ensures
that the device is not shutdown when no_console_suspend is specified.
However, the default operation of the pnp bus will disable and suspend
the device and no further output occurs.

When registering the 8250 port, if the serial device is a console
set the PNP_CONSOLE capability, which prevents device power-off
if consoles are not suspending.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_pnp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_pnp.c b/drivers/tty/serial/8250/8250_pnp.c
index 682a2fbe5c06..50a09cd76d50 100644
--- a/drivers/tty/serial/8250/8250_pnp.c
+++ b/drivers/tty/serial/8250/8250_pnp.c
@@ -426,7 +426,7 @@ static int serial_pnp_guess_board(struct pnp_dev *dev)
 static int
 serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 {
-	struct uart_8250_port uart;
+	struct uart_8250_port uart, *port;
 	int ret, line, flags = dev_id->driver_data;
 
 	if (flags & UNKNOWN_DEV) {
@@ -471,6 +471,10 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 	if (line < 0 || (flags & CIR_PORT))
 		return -ENODEV;
 
+	port = serial8250_get_port(line);
+	if (uart_console(&port->port))
+		dev->capabilities |= PNP_CONSOLE;
+
 	pnp_set_drvdata(dev, (void *)((long)line + 1));
 	return 0;
 }
@@ -478,6 +482,8 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 static void serial_pnp_remove(struct pnp_dev *dev)
 {
 	long line = (long)pnp_get_drvdata(dev);
+
+	dev->capabilities &= ~PNP_CONSOLE;
 	if (line)
 		serial8250_unregister_port(line - 1);
 }
-- 
cgit v1.2.3-59-g8ed1b


From c0b18db0562738eee578b7cd2291bd2851f6b5f8 Mon Sep 17 00:00:00 2001
From: Baruch Siach <baruch@tkos.co.il>
Date: Wed, 14 Jan 2015 08:04:21 +0200
Subject: tty/serial: digicolor: remove sysrq reference

The Digicolor USART hardware does not support detecting the BREAK condition.
This means that we can't support sysrq on this hardware. Remove all reference
to sysrq from the code.

This also fixes build when sysrq is disabled:

drivers/tty/serial/digicolor-usart.c: In function 'digicolor_uart_console_write':
drivers/tty/serial/digicolor-usart.c:407:33: error: 'struct uart_port' has no member named 'sysrq'

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/digicolor-usart.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/digicolor-usart.c b/drivers/tty/serial/digicolor-usart.c
index 09ce0b3764e2..a80cdad114f3 100644
--- a/drivers/tty/serial/digicolor-usart.c
+++ b/drivers/tty/serial/digicolor-usart.c
@@ -170,9 +170,6 @@ static void digicolor_uart_rx(struct uart_port *port)
 				ch_flag = TTY_OVERRUN;
 		}
 
-		if (uart_handle_sysrq_char(port, ch))
-			continue;
-
 		if (status & port->ignore_status_mask)
 			continue;
 
@@ -404,7 +401,7 @@ static void digicolor_uart_console_write(struct console *co, const char *c,
 	unsigned long flags;
 	int locked = 1;
 
-	if (port->sysrq || oops_in_progress)
+	if (oops_in_progress)
 		locked = spin_trylock_irqsave(&port->lock, flags);
 	else
 		spin_lock_irqsave(&port->lock, flags);
-- 
cgit v1.2.3-59-g8ed1b


From 6960cd465e553c8c0f9c26663b32bf3f3cd6a298 Mon Sep 17 00:00:00 2001
From: Fabio Estevam <fabio.estevam@freescale.com>
Date: Wed, 14 Jan 2015 14:39:07 -0200
Subject: serial: mxs-auart: Remove irq from private structure

The irq number is only used inside the probe function, so there is no need
to keep it in the private mxs_auart_port structure.

Use a local 'irq' variable for storing the irq number instead.

Also make its type of 'int' as platform_get_irq() may fail and return a
negative number.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/mxs-auart.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 1e9fb370600b..767fddaa7576 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -152,8 +152,6 @@ struct mxs_auart_port {
 	unsigned int mctrl_prev;
 	enum mxs_auart_type devtype;
 
-	unsigned int irq;
-
 	struct clk *clk;
 	struct device *dev;
 
@@ -1228,7 +1226,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
 			of_match_device(mxs_auart_dt_ids, &pdev->dev);
 	struct mxs_auart_port *s;
 	u32 version;
-	int ret = 0;
+	int ret = 0, irq;
 	struct resource *r;
 
 	s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
@@ -1266,9 +1264,9 @@ static int mxs_auart_probe(struct platform_device *pdev)
 
 	s->mctrl_prev = 0;
 
-	s->irq = platform_get_irq(pdev, 0);
-	s->port.irq = s->irq;
-	ret = devm_request_irq(&pdev->dev, s->irq, mxs_auart_irq_handle, 0,
+	irq = platform_get_irq(pdev, 0);
+	s->port.irq = irq;
+	ret = devm_request_irq(&pdev->dev, irq, mxs_auart_irq_handle, 0,
 			       dev_name(&pdev->dev), s);
 	if (ret)
 		return ret;
-- 
cgit v1.2.3-59-g8ed1b


From 99c932c26d61f2c225f8f8e00dbea404646b9166 Mon Sep 17 00:00:00 2001
From: Fabio Estevam <fabio.estevam@freescale.com>
Date: Wed, 14 Jan 2015 14:39:08 -0200
Subject: serial: mxs-auart: Check for platform_get_irq() error

We should check whether platform_get_irq() failed, and in the case of error
this needs to be propagated.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/mxs-auart.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 767fddaa7576..b54b6a2a5774 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1265,6 +1265,9 @@ static int mxs_auart_probe(struct platform_device *pdev)
 	s->mctrl_prev = 0;
 
 	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
 	s->port.irq = irq;
 	ret = devm_request_irq(&pdev->dev, irq, mxs_auart_irq_handle, 0,
 			       dev_name(&pdev->dev), s);
-- 
cgit v1.2.3-59-g8ed1b


From 5f9ba5b693ed6d639a3e6b47f4c6cd80e36f2547 Mon Sep 17 00:00:00 2001
From: Fabio Estevam <fabio.estevam@freescale.com>
Date: Wed, 14 Jan 2015 14:39:09 -0200
Subject: serial: mxs-auart: Remove unneeded zeroing of 'ret'

There is no need to explicitly zero the 'ret' variable as it is properly
initialized in a few lines below as:

ret = serial_mxs_probe_dt(s, pdev);

Remove the unneeded zeroing of 'ret'.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/mxs-auart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index b54b6a2a5774..d1298b6cc68e 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1226,7 +1226,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
 			of_match_device(mxs_auart_dt_ids, &pdev->dev);
 	struct mxs_auart_port *s;
 	u32 version;
-	int ret = 0, irq;
+	int ret, irq;
 	struct resource *r;
 
 	s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
-- 
cgit v1.2.3-59-g8ed1b


From f3e2d56dce47dbd0bb3f69f84741b439542fef37 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 13 Jan 2015 22:59:47 +0100
Subject: tty/isicom: fix big-endian compile warning

Building an arm allmodconfig kernel triggers a lengthy but harmless
warning in the isicom driver:

drvers/tty/isicom.c: In function 'isicom_send_break':
uapi/linux/swab.h:13:15: warning: integer overflow in expression [-Woverflow]
  (((__u16)(x) & (__u16)0x00ffU) << 8) |   \
               ^
uapi/linux/swab.h:107:2: note: in expansion of macro '___constant_swab16'
  ___constant_swab16(x) :   \
  ^
uapi/linux/byteorder/big_endian.h:34:43: note: in expansion of macro '__swab16'
 #define __cpu_to_le16(x) ((__force __le16)__swab16((x)))
                                           ^
linux/byteorder/generic.h:89:21: note: in expansion of macro '__cpu_to_le16'
 #define cpu_to_le16 __cpu_to_le16
                     ^
include/asm/io.h:270:6: note: in expansion of macro 'cpu_to_le16'
      cpu_to_le16(v),__io(p)); })
      ^
drivers/tty/isicom.c:1058:2: note: in expansion of macro 'outw'
  outw((length & 0xff00), base);
  ^

Apparently, the problem is related to the fact that the value 0xff00,
when used as a 16-bit number, is negative and passed into bitwise
operands of the generic byte swapping code.

Marking the input argument as unsigned in both technically correct
and avoids the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/isicom.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/isicom.c b/drivers/tty/isicom.c
index 59ed783c4bcd..2054427992e0 100644
--- a/drivers/tty/isicom.c
+++ b/drivers/tty/isicom.c
@@ -1055,7 +1055,7 @@ static int isicom_send_break(struct tty_struct *tty, int length)
 
 	outw(0x8000 | ((port->channel) << (card->shift_count)) | 0x3, base);
 	outw((length & 0xff) << 8 | 0x00, base);
-	outw((length & 0xff00), base);
+	outw((length & 0xff00u), base);
 	InterruptTheCard(base);
 
 	unlock_card(card);
-- 
cgit v1.2.3-59-g8ed1b


From 6ecde472b0d943251f8f348155495391720b61b0 Mon Sep 17 00:00:00 2001
From: Nathan Rossi <nathan.rossi@xilinx.com>
Date: Fri, 16 Jan 2015 13:49:25 +0100
Subject: tty: xuartps: Fix RX hang, and TX corruption in termios call

The implementation of flushing the RX FIFO breaks in a number of cases,
it is impossible to ensure an complete flush of the RX FIFO due to the
hardware not allowing the use of the FIFOs when the receiver is disabled
(Reading from the FIFO register does not remove it from the FIFO when
the RX_EN=0 or RX_DIS=1). Additionally during an initial set_termios
call where RX_DIS=1 causes a hang waiting forever for the RX FIFO to
empty. On top of this the FIFO will be cleared by the use of the RXRST
bits on the Control Register, making the RX flush pointless (as it does
not preserve the data read anyway).

Due to the TXRST the TX FIFO and transmitter can be interrupted during
frame trasmission, causing corruption and additionally data lost in the
FIFO. Most other serial drivers do not flush or clear the FIFOs during
a termios configuration change and as such do not have issues with
corruption. For this UART controller is it required that the TXRST/RXRST
bit be flagged during the change, this means that the data in the FIFO
will be dropped when changing configuration. In order to prevent data
loss and corruption of the transmitted data, wait until the TX FIFO is
empty before changing the configuration. The performance of this may
cause the set_termios call to take a longer amount of time especially
on lower baud rates, however it is comparable to the same performance
hit that a console_write call costs.

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
Acked-by: Anirudha Sarangi <anirudh@xilinx.com>
Acked-by: Harini Katakam <harinik@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/xilinx_uartps.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 542bab37e502..cff531a51a78 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -637,10 +637,12 @@ static void cdns_uart_set_termios(struct uart_port *port,
 
 	spin_lock_irqsave(&port->lock, flags);
 
-	/* Empty the receive FIFO 1st before making changes */
-	while ((cdns_uart_readl(CDNS_UART_SR_OFFSET) &
-		 CDNS_UART_SR_RXEMPTY) != CDNS_UART_SR_RXEMPTY) {
-		cdns_uart_readl(CDNS_UART_FIFO_OFFSET);
+	/* Wait for the transmit FIFO to empty before making changes */
+	if (!(cdns_uart_readl(CDNS_UART_CR_OFFSET) & CDNS_UART_CR_TX_DIS)) {
+		while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+				CDNS_UART_SR_TXEMPTY)) {
+			cpu_relax();
+		}
 	}
 
 	/* Disable the TX and RX to set baud rate */
-- 
cgit v1.2.3-59-g8ed1b


From c81622ac4282b0183e738e192c91fabe4a782715 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Fri, 16 Jan 2015 15:22:14 -0500
Subject: pty: Fix overlimit memory use

The pty_space() computation is broken; the space already consumed
in the tty buffer is not accounted for.

Use tty_buffer_set_limit(), which enforces the limit automatically.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/pty.c | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 6e1f1505f04e..f882ac81b93a 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -87,19 +87,6 @@ static void pty_unthrottle(struct tty_struct *tty)
 	set_bit(TTY_THROTTLED, &tty->flags);
 }
 
-/**
- *	pty_space	-	report space left for writing
- *	@to: tty we are writing into
- *
- *	Limit the buffer space used by ptys to 8k.
- */
-
-static int pty_space(struct tty_struct *to)
-{
-	int n = tty_buffer_space_avail(to->port);
-	return min(n, 8192);
-}
-
 /**
  *	pty_write		-	write to a pty
  *	@tty: the tty we write from
@@ -141,7 +128,7 @@ static int pty_write_room(struct tty_struct *tty)
 {
 	if (tty->stopped)
 		return 0;
-	return pty_space(tty->link);
+	return tty_buffer_space_avail(tty->link->port);
 }
 
 /**
@@ -432,6 +419,8 @@ static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
 	o_tty->link = tty;
 	tty_port_init(ports[0]);
 	tty_port_init(ports[1]);
+	tty_buffer_set_limit(ports[0], 8192);
+	tty_buffer_set_limit(ports[1], 8192);
 	o_tty->port = ports[0];
 	tty->port = ports[1];
 	o_tty->port->itty = o_tty;
-- 
cgit v1.2.3-59-g8ed1b


From cb8763417224340f9a6092092077c801ce686eba Mon Sep 17 00:00:00 2001
From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Date: Fri, 16 Jan 2015 13:56:02 -0800
Subject: sh-sci: extend PM methods

In order to make it possible to restore from hibernation not only in Linux but
also in e.g. U-Boot, we have to use sci_{suspend|remove}() for the PM {freeze|
thaw|restore}() methods.  It's handy to achieve this by using SIMPLE_DEV_PM_OPS()
macro, however we have to annotate sci_{suspend|remove}() with '__maybe_unused'
in order to avoid compilation warnings when CONFIG_PM_SLEEP is undefined.

Based on orignal patch by Mikhail Ulyanov <mikhail.ulyanov@cogentembedded.com>.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/sh-sci.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index e032963989fc..4f784f8bf264 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2605,7 +2605,7 @@ static int sci_probe(struct platform_device *dev)
 	return 0;
 }
 
-static int sci_suspend(struct device *dev)
+static __maybe_unused int sci_suspend(struct device *dev)
 {
 	struct sci_port *sport = dev_get_drvdata(dev);
 
@@ -2615,7 +2615,7 @@ static int sci_suspend(struct device *dev)
 	return 0;
 }
 
-static int sci_resume(struct device *dev)
+static __maybe_unused int sci_resume(struct device *dev)
 {
 	struct sci_port *sport = dev_get_drvdata(dev);
 
@@ -2625,10 +2625,7 @@ static int sci_resume(struct device *dev)
 	return 0;
 }
 
-static const struct dev_pm_ops sci_dev_pm_ops = {
-	.suspend	= sci_suspend,
-	.resume		= sci_resume,
-};
+static SIMPLE_DEV_PM_OPS(sci_dev_pm_ops, sci_suspend, sci_resume);
 
 static struct platform_driver sci_driver = {
 	.probe		= sci_probe,
-- 
cgit v1.2.3-59-g8ed1b


From a39d1da11b675b2cc2e0ffaafa8952ac7c3bd104 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Thu, 22 Jan 2015 14:40:26 +0200
Subject: serial: 8250_core: remove redundant else keyword

Since we return in the first branch the second one doesn't require an
additional else keyword. The patch removes it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 689169c11f0f..df8a5aa96bc6 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1376,9 +1376,11 @@ static void serial8250_start_tx(struct uart_port *port)
 	struct uart_8250_port *up = up_to_u8250p(port);
 
 	serial8250_rpm_get_tx(up);
-	if (up->dma && !up->dma->tx_dma(up)) {
+
+	if (up->dma && !up->dma->tx_dma(up))
 		return;
-	} else if (!(up->ier & UART_IER_THRI)) {
+
+	if (!(up->ier & UART_IER_THRI)) {
 		up->ier |= UART_IER_THRI;
 		serial_port_out(port, UART_IER, up->ier);
 
-- 
cgit v1.2.3-59-g8ed1b


From 9119fba0cfeda6d415c9f068df66838a104b87cb Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Thu, 22 Jan 2015 14:40:27 +0200
Subject: serial: 8250_dma: don't bother DMA with small transfers

If we would like to send amount of data less than FIFO size we better would do
this via PIO mode. Otherwise the overhead could be significant.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_dma.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index e508939daea3..21d01a491405 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -80,6 +80,10 @@ int serial8250_tx_dma(struct uart_8250_port *p)
 		return 0;
 
 	dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+	if (dma->tx_size < p->port.fifosize) {
+		ret = -EINVAL;
+		goto err;
+	}
 
 	desc = dmaengine_prep_slave_single(dma->txchan,
 					   dma->tx_addr + xmit->tail,
-- 
cgit v1.2.3-59-g8ed1b


From 51b31f1c6bbb3e741c930a71af8f0bcd4e5d4ded Mon Sep 17 00:00:00 2001
From: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Date: Mon, 26 Jan 2015 20:53:29 +0900
Subject: serial: sh-sci: Use dev_dbg() to log an error message

Since the driver cannot return from overrun error if characters
are output during overrun process, use dev_dbg() instead of
dev_notice() to log the error message of overrun in syslog.

Based on a patch by Hisashi Nakamura.

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/sh-sci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 4f784f8bf264..508bdb527e10 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -858,7 +858,7 @@ static int sci_handle_fifo_overrun(struct uart_port *port)
 		tty_insert_flip_char(tport, 0, TTY_OVERRUN);
 		tty_flip_buffer_push(tport);
 
-		dev_notice(port->dev, "overrun error\n");
+		dev_dbg(port->dev, "overrun error\n");
 		copied++;
 	}
 
-- 
cgit v1.2.3-59-g8ed1b


From 8b6ff84c2d445a476be5f5493b9deac00271eedd Mon Sep 17 00:00:00 2001
From: Hisashi Nakamura <hisashi.nakamura.ak@renesas.com>
Date: Mon, 26 Jan 2015 21:25:48 +0900
Subject: serial: sh-sci: Fix R-Car SCIF and HSCIF overrun handling

When fifo overrun happened, the interrupt status refers to
SCLSR register in R-Car SCIF and HSCIF.
Thus, overrun handling takes SCLSR register into account.

Signed-off-by: Hisashi Nakamura <hisashi.nakamura.ak@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/sh-sci.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 508bdb527e10..5b50c792ad5f 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -997,12 +997,15 @@ static inline unsigned long port_rx_irq_mask(struct uart_port *port)
 static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
 {
 	unsigned short ssr_status, scr_status, err_enabled;
+	unsigned short slr_status = 0;
 	struct uart_port *port = ptr;
 	struct sci_port *s = to_sci_port(port);
 	irqreturn_t ret = IRQ_NONE;
 
 	ssr_status = serial_port_in(port, SCxSR);
 	scr_status = serial_port_in(port, SCSCR);
+	if (port->type == PORT_SCIF || port->type == PORT_HSCIF)
+		slr_status = serial_port_in(port, SCLSR);
 	err_enabled = scr_status & port_rx_irq_mask(port);
 
 	/* Tx Interrupt */
@@ -1015,8 +1018,11 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
 	 * DR flags
 	 */
 	if (((ssr_status & SCxSR_RDxF(port)) || s->chan_rx) &&
-	    (scr_status & SCSCR_RIE))
+	    (scr_status & SCSCR_RIE)) {
+		if (port->type == PORT_SCIF || port->type == PORT_HSCIF)
+			sci_handle_fifo_overrun(port);
 		ret = sci_rx_interrupt(irq, ptr);
+	}
 
 	/* Error Interrupt */
 	if ((ssr_status & SCxSR_ERRORS(port)) && err_enabled)
@@ -1026,6 +1032,12 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
 	if ((ssr_status & SCxSR_BRK(port)) && err_enabled)
 		ret = sci_br_interrupt(irq, ptr);
 
+	/* Overrun Interrupt */
+	if (port->type == PORT_SCIF || port->type == PORT_HSCIF) {
+		if (slr_status & 0x01)
+			sci_handle_fifo_overrun(port);
+	}
+
 	return ret;
 }
 
-- 
cgit v1.2.3-59-g8ed1b


From b94ba0328d3b36ff95f5074c0e9b44f90dc56bb5 Mon Sep 17 00:00:00 2001
From: Tomasz Figa <t.figa@samsung.com>
Date: Fri, 23 Jan 2015 14:47:41 +0100
Subject: serial: samsung: Add support for early console

This patch adds support for early console initialized from device tree
and kernel command line to all variants of Samsung serial driver.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
[mszyprow: added support for command line based initialization,
           fixed comments, added documentation]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 Documentation/kernel-parameters.txt |  12 +++++
 drivers/tty/serial/Kconfig          |   1 +
 drivers/tty/serial/samsung.c        | 103 ++++++++++++++++++++++++++++++++++++
 3 files changed, 116 insertions(+)

(limited to 'drivers/tty')

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4df73da11adc..e855697f54c5 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -970,6 +970,18 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
 		smh	Use ARM semihosting calls for early console.
 
+		s3c2410,<addr>
+		s3c2412,<addr>
+		s3c2440,<addr>
+		s3c6400,<addr>
+		s5pv210,<addr>
+		exynos4210,<addr>
+			Use early console provided by serial driver available
+			on Samsung SoCs, requires selecting proper type and
+			a correct base address of the selected UART port. The
+			serial port must already be setup and configured.
+			Options are not yet supported.
+
 	earlyprintk=	[X86,SH,BLACKFIN,ARM,M68k]
 			earlyprintk=vga
 			earlyprintk=efi
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 35677f75a1d8..c63317e87c33 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -241,6 +241,7 @@ config SERIAL_SAMSUNG
 	tristate "Samsung SoC serial support"
 	depends on PLAT_SAMSUNG || ARCH_EXYNOS
 	select SERIAL_CORE
+	select SERIAL_EARLYCON
 	help
 	  Support for the on-chip UARTs on the Samsung S3C24XX series CPUs,
 	  providing /dev/ttySAC0, 1 and 2 (note, some machines may not
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 024e5ecee985..a6bef8dcdc3c 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -2403,6 +2403,109 @@ static struct platform_driver samsung_serial_driver = {
 
 module_platform_driver(samsung_serial_driver);
 
+/*
+ * Early console.
+ */
+
+struct samsung_early_console_data {
+	u32 txfull_mask;
+};
+
+static void samsung_early_busyuart(struct uart_port *port)
+{
+	while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE))
+		;
+}
+
+static void samsung_early_busyuart_fifo(struct uart_port *port)
+{
+	struct samsung_early_console_data *data = port->private_data;
+
+	while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask)
+		;
+}
+
+static void samsung_early_putc(struct uart_port *port, int c)
+{
+	if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
+		samsung_early_busyuart_fifo(port);
+	else
+		samsung_early_busyuart(port);
+
+	writeb(c, port->membase + S3C2410_UTXH);
+}
+
+static void samsung_early_write(struct console *con, const char *s, unsigned n)
+{
+	struct earlycon_device *dev = con->data;
+
+	uart_console_write(&dev->port, s, n, samsung_early_putc);
+}
+
+static int __init samsung_early_console_setup(struct earlycon_device *device,
+					      const char *opt)
+{
+	if (!device->port.membase)
+		return -ENODEV;
+
+	device->con->write = samsung_early_write;
+	return 0;
+}
+
+/* S3C2410 */
+static struct samsung_early_console_data s3c2410_early_console_data = {
+	.txfull_mask = S3C2410_UFSTAT_TXFULL,
+};
+
+static int __init s3c2410_early_console_setup(struct earlycon_device *device,
+					      const char *opt)
+{
+	device->port.private_data = &s3c2410_early_console_data;
+	return samsung_early_console_setup(device, opt);
+}
+OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart",
+			s3c2410_early_console_setup);
+EARLYCON_DECLARE(s3c2410, s3c2410_early_console_setup);
+
+/* S3C2412, S3C2440, S3C64xx */
+static struct samsung_early_console_data s3c2440_early_console_data = {
+	.txfull_mask = S3C2440_UFSTAT_TXFULL,
+};
+
+static int __init s3c2440_early_console_setup(struct earlycon_device *device,
+					      const char *opt)
+{
+	device->port.private_data = &s3c2440_early_console_data;
+	return samsung_early_console_setup(device, opt);
+}
+OF_EARLYCON_DECLARE(s3c2412, "samsung,s3c2412-uart",
+			s3c2440_early_console_setup);
+OF_EARLYCON_DECLARE(s3c2440, "samsung,s3c2440-uart",
+			s3c2440_early_console_setup);
+OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart",
+			s3c2440_early_console_setup);
+EARLYCON_DECLARE(s3c2412, s3c2440_early_console_setup);
+EARLYCON_DECLARE(s3c2440, s3c2440_early_console_setup);
+EARLYCON_DECLARE(s3c6400, s3c2440_early_console_setup);
+
+/* S5PV210, EXYNOS */
+static struct samsung_early_console_data s5pv210_early_console_data = {
+	.txfull_mask = S5PV210_UFSTAT_TXFULL,
+};
+
+static int __init s5pv210_early_console_setup(struct earlycon_device *device,
+					      const char *opt)
+{
+	device->port.private_data = &s5pv210_early_console_data;
+	return samsung_early_console_setup(device, opt);
+}
+OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart",
+			s5pv210_early_console_setup);
+OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
+			s5pv210_early_console_setup);
+EARLYCON_DECLARE(s5pv210, s5pv210_early_console_setup);
+EARLYCON_DECLARE(exynos4210, s5pv210_early_console_setup);
+
 MODULE_ALIAS("platform:samsung-uart");
 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
-- 
cgit v1.2.3-59-g8ed1b


From 2c5dc4641ca0e046b432f94f7058c4aff3440e47 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Fri, 16 Jan 2015 15:05:34 -0500
Subject: n_tty: Eliminate receive_room() from consumer/exclusive paths

The input worker never reschedules itself; it only processes input until
either there is no more input or the read buffer is full. So the reader
is responsible for restarting the input worker only if the read buffer
was previously full (no_room == 1) _and_ space is now available to process
more input because the reader has consumed data from the read buffer.

However, computing the actual space available is not required to determine
if the reader has consumed data from the read buffer. This condition is
evaluated in 5 situations, each of which the space avail is already known:
1. n_tty_flush_buffer() - the read buffer is empty; kick the worker
2. n_tty_set_termios() - no data has been consumed; do not kick the worker
       (although it may have kicked the reader so data _will be_ consumed)
3. n_tty_check_unthrottle - avail space > 3968; kick the worker
4. n_tty_read, before leaving - only kick the worker if the reader has
       moved the tail. This prevents unnecessarily kicking the worker
       when timeout-style reading is used.
5. n_tty_read, before sleeping - although it is possible for the read
       buffer to be full and input_available_p() to be false, this can
       only happen when the input worker is racing the reader, in which
       case the reader will have been woken and won't sleep.

Rename n_tty_set_room() to n_tty_kick_worker() to reflect what the
function actually does.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/n_tty.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 4ddfa60c9222..b60b043f47d8 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -187,10 +187,10 @@ static int receive_room(struct tty_struct *tty)
 }
 
 /**
- *	n_tty_set_room	-	receive space
+ *	n_tty_kick_worker - start input worker (if required)
  *	@tty: terminal
  *
- *	Re-schedules the flip buffer work if space just became available.
+ *	Re-schedules the flip buffer work if it may have stopped
  *
  *	Caller holds exclusive termios_rwsem
  *	   or
@@ -198,12 +198,12 @@ static int receive_room(struct tty_struct *tty)
  *		holds non-exclusive termios_rwsem
  */
 
-static void n_tty_set_room(struct tty_struct *tty)
+static void n_tty_kick_worker(struct tty_struct *tty)
 {
 	struct n_tty_data *ldata = tty->disc_data;
 
-	/* Did this open up the receive buffer? We may need to flip */
-	if (unlikely(ldata->no_room) && receive_room(tty)) {
+	/* Did the input worker stop? Restart it */
+	if (unlikely(ldata->no_room)) {
 		ldata->no_room = 0;
 
 		WARN_RATELIMIT(tty->port->itty == NULL,
@@ -274,7 +274,7 @@ static void n_tty_check_unthrottle(struct tty_struct *tty)
 			return;
 		if (!tty->count)
 			return;
-		n_tty_set_room(tty);
+		n_tty_kick_worker(tty);
 		n_tty_write_wakeup(tty->link);
 		if (waitqueue_active(&tty->link->write_wait))
 			wake_up_interruptible_poll(&tty->link->write_wait, POLLOUT);
@@ -296,7 +296,7 @@ static void n_tty_check_unthrottle(struct tty_struct *tty)
 			break;
 		if (!tty->count)
 			break;
-		n_tty_set_room(tty);
+		n_tty_kick_worker(tty);
 		unthrottled = tty_unthrottle_safe(tty);
 		if (!unthrottled)
 			break;
@@ -379,7 +379,7 @@ static void n_tty_flush_buffer(struct tty_struct *tty)
 {
 	down_write(&tty->termios_rwsem);
 	reset_buffer_flags(tty->disc_data);
-	n_tty_set_room(tty);
+	n_tty_kick_worker(tty);
 
 	if (tty->link)
 		n_tty_packet_mode_flush(tty);
@@ -1817,7 +1817,6 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
 		else
 			ldata->real_raw = 0;
 	}
-	n_tty_set_room(tty);
 	/*
 	 * Fix tty hang when I_IXON(tty) is cleared, but the tty
 	 * been stopped by STOP_CHAR(tty) before it.
@@ -2130,6 +2129,7 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 	ssize_t retval = 0;
 	long timeout;
 	int packet;
+	size_t tail;
 
 	c = job_control(tty, file);
 	if (c < 0)
@@ -2166,6 +2166,7 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 	}
 
 	packet = tty->packet;
+	tail = ldata->read_tail;
 
 	add_wait_queue(&tty->read_wait, &wait);
 	while (nr) {
@@ -2208,7 +2209,6 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 				retval = -ERESTARTSYS;
 				break;
 			}
-			n_tty_set_room(tty);
 			up_read(&tty->termios_rwsem);
 
 			timeout = wait_woken(&wait, TASK_INTERRUPTIBLE,
@@ -2253,7 +2253,8 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 		if (time)
 			timeout = time;
 	}
-	n_tty_set_room(tty);
+	if (tail != ldata->read_tail)
+		n_tty_kick_worker(tty);
 	up_read(&tty->termios_rwsem);
 
 	remove_wait_queue(&tty->read_wait, &wait);
-- 
cgit v1.2.3-59-g8ed1b


From a342846f9b0448996f56ebece80454d41b431ce2 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Fri, 16 Jan 2015 15:05:35 -0500
Subject: n_tty: Fix throttle for canon lines > 3967 chars

The tty driver will be mistakenly throttled if a line termination
has not been received, and the line exceeds 3967 chars. Thus, it is
possible for the driver to stop sending when it has not yet sent
the newline. This does not apply to the pty driver.

Don't throttle until at least one line termination has been
received.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/n_tty.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index b60b043f47d8..d4b14c30794e 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -247,6 +247,8 @@ static void n_tty_write_wakeup(struct tty_struct *tty)
 
 static void n_tty_check_throttle(struct tty_struct *tty)
 {
+	struct n_tty_data *ldata = tty->disc_data;
+
 	if (tty->driver->type == TTY_DRIVER_TYPE_PTY)
 		return;
 	/*
@@ -254,6 +256,9 @@ static void n_tty_check_throttle(struct tty_struct *tty)
 	 * mode.  We don't want to throttle the driver if we're in
 	 * canonical mode and don't have a newline yet!
 	 */
+	if (ldata->icanon && ldata->canon_head == ldata->read_tail)
+		return;
+
 	while (1) {
 		int throttled;
 		tty_set_flow_change(tty, TTY_THROTTLE_SAFE);
-- 
cgit v1.2.3-59-g8ed1b


From 5e28cca1539f3532cb2392710655cd3e562cee8b Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Fri, 16 Jan 2015 15:05:36 -0500
Subject: n_tty: Simplify throttle threshold calculation

The adjustments performed by receive_room() are to ensure a line
termination can always be written to the read buffer. However,
these adjustments are irrelevant to the throttle threshold (because
the threshold < buffer limit).

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/n_tty.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index d4b14c30794e..7efabc4673b6 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -262,7 +262,7 @@ static void n_tty_check_throttle(struct tty_struct *tty)
 	while (1) {
 		int throttled;
 		tty_set_flow_change(tty, TTY_THROTTLE_SAFE);
-		if (receive_room(tty) >= TTY_THRESHOLD_THROTTLE)
+		if (N_TTY_BUF_SIZE - read_cnt(ldata) >= TTY_THRESHOLD_THROTTLE)
 			break;
 		throttled = tty_throttle_safe(tty);
 		if (!throttled)
-- 
cgit v1.2.3-59-g8ed1b


From 70aca71f92ca2c111978bf676287fab5580d2598 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Fri, 16 Jan 2015 15:05:37 -0500
Subject: n_tty: Fix unordered accesses to lockless read buffer

Add commit_head buffer index, which the producer-side publishes
after input processing in non-canon mode. This ensures the consumer-side
observes correctly-ordered writes in non-canonical mode (ie., the buffer
data is written before the buffer index is advanced). Fix consumer-side
uses of read_cnt() to use commit_head instead.

Add required memory barriers to the tail index to guarantee
the consumer-side has completed the loads before the producer-side
begins writing new data. Open-code the producer-side receive_room()
into the i/o loop.

Remove no-longer-referenced receive_room().

Based on work by Christian Riesch <christian.riesch@omicron.at>

Cc: Christian Riesch <christian.riesch@omicron.at>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/n_tty.c | 101 +++++++++++++++++++++++++---------------------------
 1 file changed, 48 insertions(+), 53 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 7efabc4673b6..f63b25bbe895 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -90,6 +90,7 @@
 struct n_tty_data {
 	/* producer-published */
 	size_t read_head;
+	size_t commit_head;
 	size_t canon_head;
 	size_t echo_head;
 	size_t echo_commit;
@@ -161,31 +162,6 @@ static inline int tty_put_user(struct tty_struct *tty, unsigned char x,
 	return put_user(x, ptr);
 }
 
-static int receive_room(struct tty_struct *tty)
-{
-	struct n_tty_data *ldata = tty->disc_data;
-	int left;
-
-	if (I_PARMRK(tty)) {
-		/* Multiply read_cnt by 3, since each byte might take up to
-		 * three times as many spaces when PARMRK is set (depending on
-		 * its flags, e.g. parity error). */
-		left = N_TTY_BUF_SIZE - read_cnt(ldata) * 3 - 1;
-	} else
-		left = N_TTY_BUF_SIZE - read_cnt(ldata) - 1;
-
-	/*
-	 * If we are doing input canonicalization, and there are no
-	 * pending newlines, let characters through without limit, so
-	 * that erase characters will be handled.  Other excess
-	 * characters will be beeped.
-	 */
-	if (left <= 0)
-		left = ldata->icanon && ldata->canon_head == ldata->read_tail;
-
-	return left;
-}
-
 /**
  *	n_tty_kick_worker - start input worker (if required)
  *	@tty: terminal
@@ -224,7 +200,7 @@ static ssize_t chars_in_buffer(struct tty_struct *tty)
 	ssize_t n = 0;
 
 	if (!ldata->icanon)
-		n = read_cnt(ldata);
+		n = ldata->commit_head - ldata->read_tail;
 	else
 		n = ldata->canon_head - ldata->read_tail;
 	return n;
@@ -318,10 +294,6 @@ static void n_tty_check_unthrottle(struct tty_struct *tty)
  *
  *	n_tty_receive_buf()/producer path:
  *		caller holds non-exclusive termios_rwsem
- *		modifies read_head
- *
- *	read_head is only considered 'published' if canonical mode is
- *	not active.
  */
 
 static inline void put_tty_queue(unsigned char c, struct n_tty_data *ldata)
@@ -345,6 +317,7 @@ static void reset_buffer_flags(struct n_tty_data *ldata)
 {
 	ldata->read_head = ldata->canon_head = ldata->read_tail = 0;
 	ldata->echo_head = ldata->echo_tail = ldata->echo_commit = 0;
+	ldata->commit_head = 0;
 	ldata->echo_mark = 0;
 	ldata->line_start = 0;
 
@@ -992,10 +965,6 @@ static inline void finish_erasing(struct n_tty_data *ldata)
  *
  *	n_tty_receive_buf()/producer path:
  *		caller holds non-exclusive termios_rwsem
- *		modifies read_head
- *
- *	Modifying the read_head is not considered a publish in this context
- *	because canonical mode is active -- only canon_head publishes
  */
 
 static void eraser(unsigned char c, struct tty_struct *tty)
@@ -1144,7 +1113,6 @@ static void isig(int sig, struct tty_struct *tty)
  *
  *	n_tty_receive_buf()/producer path:
  *		caller holds non-exclusive termios_rwsem
- *		publishes read_head via put_tty_queue()
  *
  *	Note: may get exclusive termios_rwsem if flushing input buffer
  */
@@ -1214,7 +1182,6 @@ static void n_tty_receive_overrun(struct tty_struct *tty)
  *
  *	n_tty_receive_buf()/producer path:
  *		caller holds non-exclusive termios_rwsem
- *		publishes read_head via put_tty_queue()
  */
 static void n_tty_receive_parity_error(struct tty_struct *tty, unsigned char c)
 {
@@ -1268,7 +1235,6 @@ n_tty_receive_signal_char(struct tty_struct *tty, int signal, unsigned char c)
  *	n_tty_receive_buf()/producer path:
  *		caller holds non-exclusive termios_rwsem
  *		publishes canon_head if canonical mode is active
- *		otherwise, publishes read_head via put_tty_queue()
  *
  *	Returns 1 if LNEXT was received, else returns 0
  */
@@ -1381,7 +1347,7 @@ n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)
 handle_newline:
 			set_bit(ldata->read_head & (N_TTY_BUF_SIZE - 1), ldata->read_flags);
 			put_tty_queue(c, ldata);
-			ldata->canon_head = ldata->read_head;
+			smp_store_release(&ldata->canon_head, ldata->read_head);
 			kill_fasync(&tty->fasync, SIGIO, POLL_IN);
 			if (waitqueue_active(&tty->read_wait))
 				wake_up_interruptible_poll(&tty->read_wait, POLLIN);
@@ -1531,7 +1497,7 @@ n_tty_receive_char_lnext(struct tty_struct *tty, unsigned char c, char flag)
  *
  *	n_tty_receive_buf()/producer path:
  *		claims non-exclusive termios_rwsem
- *		publishes read_head and canon_head
+ *		publishes commit_head or canon_head
  */
 
 static void
@@ -1542,16 +1508,14 @@ n_tty_receive_buf_real_raw(struct tty_struct *tty, const unsigned char *cp,
 	size_t n, head;
 
 	head = ldata->read_head & (N_TTY_BUF_SIZE - 1);
-	n = N_TTY_BUF_SIZE - max(read_cnt(ldata), head);
-	n = min_t(size_t, count, n);
+	n = min_t(size_t, count, N_TTY_BUF_SIZE - head);
 	memcpy(read_buf_addr(ldata, head), cp, n);
 	ldata->read_head += n;
 	cp += n;
 	count -= n;
 
 	head = ldata->read_head & (N_TTY_BUF_SIZE - 1);
-	n = N_TTY_BUF_SIZE - max(read_cnt(ldata), head);
-	n = min_t(size_t, count, n);
+	n = min_t(size_t, count, N_TTY_BUF_SIZE - head);
 	memcpy(read_buf_addr(ldata, head), cp, n);
 	ldata->read_head += n;
 }
@@ -1681,8 +1645,13 @@ static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
 			tty->ops->flush_chars(tty);
 	}
 
-	if ((!ldata->icanon && (read_cnt(ldata) >= ldata->minimum_to_wake)) ||
-		L_EXTPROC(tty)) {
+	if (ldata->icanon && !L_EXTPROC(tty))
+		return;
+
+	/* publish read_head to consumer */
+	smp_store_release(&ldata->commit_head, ldata->read_head);
+
+	if ((read_cnt(ldata) >= ldata->minimum_to_wake) || L_EXTPROC(tty)) {
 		kill_fasync(&tty->fasync, SIGIO, POLL_IN);
 		if (waitqueue_active(&tty->read_wait))
 			wake_up_interruptible_poll(&tty->read_wait, POLLIN);
@@ -1699,7 +1668,31 @@ n_tty_receive_buf_common(struct tty_struct *tty, const unsigned char *cp,
 	down_read(&tty->termios_rwsem);
 
 	while (1) {
-		room = receive_room(tty);
+		/*
+		 * When PARMRK is set, multiply read_cnt by 3, since each byte
+		 * might take up to three times as many spaces (depending on
+		 * its flags, e.g. parity error). [This calculation is wrong.]
+		 *
+		 * If we are doing input canonicalization, and there are no
+		 * pending newlines, let characters through without limit, so
+		 * that erase characters will be handled.  Other excess
+		 * characters will be beeped.
+		 *
+		 * paired with store in *_copy_from_read_buf() -- guarantees
+		 * the consumer has loaded the data in read_buf up to the new
+		 * read_tail (so this producer will not overwrite unread data)
+		 */
+		size_t tail = smp_load_acquire(&ldata->read_tail);
+		size_t head = ldata->read_head;
+
+		if (I_PARMRK(tty))
+			room = N_TTY_BUF_SIZE - (head - tail) * 3 - 1;
+		else
+			room = N_TTY_BUF_SIZE - (head - tail) - 1;
+
+		if (room <= 0)
+			room = ldata->icanon && ldata->canon_head == tail;
+
 		n = min(count, room);
 		if (!n) {
 			if (flow && !room)
@@ -1769,6 +1762,7 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
 			ldata->canon_head = ldata->read_head;
 			ldata->push = 1;
 		}
+		ldata->commit_head = ldata->read_head;
 		ldata->erasing = 0;
 		ldata->lnext = 0;
 	}
@@ -1909,7 +1903,7 @@ static inline int input_available_p(struct tty_struct *tty, int poll)
 	if (ldata->icanon && !L_EXTPROC(tty))
 		return ldata->canon_head != ldata->read_tail;
 	else
-		return read_cnt(ldata) >= amt;
+		return ldata->commit_head - ldata->read_tail >= amt;
 }
 
 /**
@@ -1941,10 +1935,11 @@ static int copy_from_read_buf(struct tty_struct *tty,
 	int retval;
 	size_t n;
 	bool is_eof;
+	size_t head = smp_load_acquire(&ldata->commit_head);
 	size_t tail = ldata->read_tail & (N_TTY_BUF_SIZE - 1);
 
 	retval = 0;
-	n = min(read_cnt(ldata), N_TTY_BUF_SIZE - tail);
+	n = min(head - ldata->read_tail, N_TTY_BUF_SIZE - tail);
 	n = min(*nr, n);
 	if (n) {
 		retval = copy_to_user(*b, read_buf_addr(ldata, tail), n);
@@ -1952,9 +1947,10 @@ static int copy_from_read_buf(struct tty_struct *tty,
 		is_eof = n == 1 && read_buf(ldata, tail) == EOF_CHAR(tty);
 		tty_audit_add_data(tty, read_buf_addr(ldata, tail), n,
 				ldata->icanon);
-		ldata->read_tail += n;
+		smp_store_release(&ldata->read_tail, ldata->read_tail + n);
 		/* Turn single EOF into zero-length read */
-		if (L_EXTPROC(tty) && ldata->icanon && is_eof && !read_cnt(ldata))
+		if (L_EXTPROC(tty) && ldata->icanon && is_eof &&
+		    (head == ldata->read_tail))
 			n = 0;
 		*b += n;
 		*nr -= n;
@@ -1997,7 +1993,7 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
 	bool eof_push = 0;
 
 	/* N.B. avoid overrun if nr == 0 */
-	n = min(*nr, read_cnt(ldata));
+	n = min(*nr, smp_load_acquire(&ldata->canon_head) - ldata->read_tail);
 	if (!n)
 		return 0;
 
@@ -2047,8 +2043,7 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
 
 	if (found)
 		clear_bit(eol, ldata->read_flags);
-	smp_mb__after_atomic();
-	ldata->read_tail += c;
+	smp_store_release(&ldata->read_tail, ldata->read_tail + c);
 
 	if (found) {
 		if (!ldata->push)
-- 
cgit v1.2.3-59-g8ed1b


From 06c49f9fa31f026e00a15cc6487b4d8d99b0e333 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Fri, 16 Jan 2015 15:05:38 -0500
Subject: n_tty: Fix PARMRK over-throttling

If PARMRK is enabled, the available read buffer space computation is
overly-pessimistic, which results in severely throttled i/o, even
in the absence of parity errors. For example, if the 4k read buffer
contains 1k processed data, the input worker will compute available
space of 333 bytes, despite 3k being available. At 1365 chars of
processed data, 0 space available is computed.

*Divide remaining space* by 3, truncating down (if left == 2, left = 0).

Reported-by: Christian Riesch <christian.riesch@omicron.at>

Conflicts:
	drivers/tty/n_tty.c

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/n_tty.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index f63b25bbe895..7aeabb719526 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1669,9 +1669,8 @@ n_tty_receive_buf_common(struct tty_struct *tty, const unsigned char *cp,
 
 	while (1) {
 		/*
-		 * When PARMRK is set, multiply read_cnt by 3, since each byte
-		 * might take up to three times as many spaces (depending on
-		 * its flags, e.g. parity error). [This calculation is wrong.]
+		 * When PARMRK is set, each input char may take up to 3 chars
+		 * in the read buf; reduce the buffer space avail by 3x
 		 *
 		 * If we are doing input canonicalization, and there are no
 		 * pending newlines, let characters through without limit, so
@@ -1683,13 +1682,10 @@ n_tty_receive_buf_common(struct tty_struct *tty, const unsigned char *cp,
 		 * read_tail (so this producer will not overwrite unread data)
 		 */
 		size_t tail = smp_load_acquire(&ldata->read_tail);
-		size_t head = ldata->read_head;
 
+		room = N_TTY_BUF_SIZE - (ldata->read_head - tail) - 1;
 		if (I_PARMRK(tty))
-			room = N_TTY_BUF_SIZE - (head - tail) * 3 - 1;
-		else
-			room = N_TTY_BUF_SIZE - (head - tail) - 1;
-
+			room /= 3;
 		if (room <= 0)
 			room = ldata->icanon && ldata->canon_head == tail;
 
-- 
cgit v1.2.3-59-g8ed1b


From fb5ef9e7da39968fec6d6f37f20a23d23740c75e Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Fri, 16 Jan 2015 15:05:39 -0500
Subject: n_tty: Fix read buffer overwrite when no newline

In canon mode, the read buffer head will advance over the buffer tail
if the input > 4095 bytes without receiving a line termination char.

Discard additional input until a line termination is received.
Before evaluating for overflow, the 'room' value is normalized for
I_PARMRK and 1 byte is reserved for line termination (even in !icanon
mode, in case the mode is switched). The following table shows the
transform:

 actual buffer |  'room' value before overflow calc
  space avail  |    !I_PARMRK    |    I_PARMRK
 --------------------------------------------------
      0        |       -1        |       -1
      1        |        0        |        0
      2        |        1        |        0
      3        |        2        |        0
      4+       |        3        |        1

When !icanon or when icanon and the read buffer contains newlines,
normalized 'room' values of -1 and 0 are clamped to 0, and
'overflow' is 0, so read_head is not adjusted and the input i/o loop
exits (setting no_room if called from flush_to_ldisc()). No input
is discarded since the reader does have input available to read
which ensures forward progress.

When icanon and the read buffer does not contain newlines and the
normalized 'room' value is 0, then overflow and room are reset to 1,
so that the i/o loop will process the next input char normally
(except for parity errors which are ignored). Thus, erasures, signalling
chars, 7-bit mode, etc. will continue to be handled properly.

If the input char processed was not a line termination char, then
the canon_head index will not have advanced, so the normalized 'room'
value will now be -1 and 'overflow' will be set, which indicates the
read_head can safely be reset, effectively erasing the last char
processed.

If the input char processed was a line termination, then the
canon_head index will have advanced, so 'overflow' is cleared to 0,
the read_head is not reset, and 'room' is cleared to 0, which exits
the i/o loop (because the reader now have input available to read
which ensures forward progress).

Note that it is possible for a line termination to be received, and
for the reader to copy the line to the user buffer before the
input i/o loop is ready to process the next input char. This is
why the i/o loop recomputes the room/overflow state with every
input char while handling overflow.

Finally, if the input data was processed without receiving
a line termination (so that overflow is still set), the pty
driver must receive a write wakeup. A pty writer may be waiting
to write more data in n_tty_write() but without unthrottling
here that wakeup will not arrive, and forward progress will halt.
(Normally, the pty writer is woken when the reader reads data out
of the buffer and more space become available).

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/n_tty.c | 92 ++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 62 insertions(+), 30 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 7aeabb719526..5793aa0d3bfb 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -225,8 +225,6 @@ static void n_tty_check_throttle(struct tty_struct *tty)
 {
 	struct n_tty_data *ldata = tty->disc_data;
 
-	if (tty->driver->type == TTY_DRIVER_TYPE_PTY)
-		return;
 	/*
 	 * Check the remaining room for the input canonicalization
 	 * mode.  We don't want to throttle the driver if we're in
@@ -1483,23 +1481,6 @@ n_tty_receive_char_lnext(struct tty_struct *tty, unsigned char c, char flag)
 		n_tty_receive_char_flagged(tty, c, flag);
 }
 
-/**
- *	n_tty_receive_buf	-	data receive
- *	@tty: terminal device
- *	@cp: buffer
- *	@fp: flag buffer
- *	@count: characters
- *
- *	Called by the terminal driver when a block of characters has
- *	been received. This function must be called from soft contexts
- *	not from interrupt context. The driver is responsible for making
- *	calls one at a time and in order (or using flush_to_ldisc)
- *
- *	n_tty_receive_buf()/producer path:
- *		claims non-exclusive termios_rwsem
- *		publishes commit_head or canon_head
- */
-
 static void
 n_tty_receive_buf_real_raw(struct tty_struct *tty, const unsigned char *cp,
 			   char *fp, int count)
@@ -1658,12 +1639,45 @@ static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
 	}
 }
 
+/**
+ *	n_tty_receive_buf_common	-	process input
+ *	@tty: device to receive input
+ *	@cp: input chars
+ *	@fp: flags for each char (if NULL, all chars are TTY_NORMAL)
+ *	@count: number of input chars in @cp
+ *
+ *	Called by the terminal driver when a block of characters has
+ *	been received. This function must be called from soft contexts
+ *	not from interrupt context. The driver is responsible for making
+ *	calls one at a time and in order (or using flush_to_ldisc)
+ *
+ *	Returns the # of input chars from @cp which were processed.
+ *
+ *	In canonical mode, the maximum line length is 4096 chars (including
+ *	the line termination char); lines longer than 4096 chars are
+ *	truncated. After 4095 chars, input data is still processed but
+ *	not stored. Overflow processing ensures the tty can always
+ *	receive more input until at least one line can be read.
+ *
+ *	In non-canonical mode, the read buffer will only accept 4095 chars;
+ *	this provides the necessary space for a newline char if the input
+ *	mode is switched to canonical.
+ *
+ *	Note it is possible for the read buffer to _contain_ 4096 chars
+ *	in non-canonical mode: the read buffer could already contain the
+ *	maximum canon line of 4096 chars when the mode is switched to
+ *	non-canonical.
+ *
+ *	n_tty_receive_buf()/producer path:
+ *		claims non-exclusive termios_rwsem
+ *		publishes commit_head or canon_head
+ */
 static int
 n_tty_receive_buf_common(struct tty_struct *tty, const unsigned char *cp,
 			 char *fp, int count, int flow)
 {
 	struct n_tty_data *ldata = tty->disc_data;
-	int room, n, rcvd = 0;
+	int room, n, rcvd = 0, overflow;
 
 	down_read(&tty->termios_rwsem);
 
@@ -1683,19 +1697,27 @@ n_tty_receive_buf_common(struct tty_struct *tty, const unsigned char *cp,
 		 */
 		size_t tail = smp_load_acquire(&ldata->read_tail);
 
-		room = N_TTY_BUF_SIZE - (ldata->read_head - tail) - 1;
+		room = N_TTY_BUF_SIZE - (ldata->read_head - tail);
 		if (I_PARMRK(tty))
-			room /= 3;
-		if (room <= 0)
-			room = ldata->icanon && ldata->canon_head == tail;
+			room = (room + 2) / 3;
+		room--;
+		if (room <= 0) {
+			overflow = ldata->icanon && ldata->canon_head == tail;
+			if (overflow && room < 0)
+				ldata->read_head--;
+			room = overflow;
+			ldata->no_room = flow && !room;
+		} else
+			overflow = 0;
 
 		n = min(count, room);
-		if (!n) {
-			if (flow && !room)
-				ldata->no_room = 1;
+		if (!n)
 			break;
-		}
-		__receive_buf(tty, cp, fp, n);
+
+		/* ignore parity errors if handling overflow */
+		if (!overflow || !fp || *fp != TTY_PARITY)
+			__receive_buf(tty, cp, fp, n);
+
 		cp += n;
 		if (fp)
 			fp += n;
@@ -1704,7 +1726,17 @@ n_tty_receive_buf_common(struct tty_struct *tty, const unsigned char *cp,
 	}
 
 	tty->receive_room = room;
-	n_tty_check_throttle(tty);
+
+	/* Unthrottle if handling overflow on pty */
+	if (tty->driver->type == TTY_DRIVER_TYPE_PTY) {
+		if (overflow) {
+			tty_set_flow_change(tty, TTY_UNTHROTTLE_SAFE);
+			tty_unthrottle_safe(tty);
+			__tty_set_flow_change(tty, 0);
+		}
+	} else
+		n_tty_check_throttle(tty);
+
 	up_read(&tty->termios_rwsem);
 
 	return rcvd;
-- 
cgit v1.2.3-59-g8ed1b


From 3abf87cd3e70009ed70a7f28c2914888a7e27332 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Sat, 17 Jan 2015 15:42:04 -0500
Subject: tty: Make lock subclasses available for other tty locks

Besides nested legacy_mutex locking which is required on pty pair
teardown, other nested pty operations require lock subclassing.

Move lock subclass definition to tty interface header, include/linux/tty.h,
and document its use.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/tty_mutex.c | 12 +-----------
 include/linux/tty.h     | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 11 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/tty_mutex.c b/drivers/tty/tty_mutex.c
index a872389dc0bc..0efcf713b756 100644
--- a/drivers/tty/tty_mutex.c
+++ b/drivers/tty/tty_mutex.c
@@ -4,18 +4,8 @@
 #include <linux/semaphore.h>
 #include <linux/sched.h>
 
-/*
- * Nested tty locks are necessary for releasing pty pairs.
- * The stable lock order is master pty first, then slave pty.
- */
-
 /* Legacy tty mutex glue */
 
-enum {
-	TTY_MUTEX_NORMAL,
-	TTY_MUTEX_SLAVE,
-};
-
 /*
  * Getting the big tty mutex.
  */
@@ -58,5 +48,5 @@ void __lockfunc tty_unlock_slave(struct tty_struct *tty)
 
 void tty_set_lock_subclass(struct tty_struct *tty)
 {
-	lockdep_set_subclass(&tty->legacy_mutex, TTY_MUTEX_SLAVE);
+	lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE);
 }
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 7d66ae508e5c..849659908f23 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -14,6 +14,23 @@
 #include <linux/llist.h>
 
 
+/*
+ * Lock subclasses for tty locks
+ *
+ * TTY_LOCK_NORMAL is for normal ttys and master ptys.
+ * TTY_LOCK_SLAVE is for slave ptys only.
+ *
+ * Lock subclasses are necessary for handling nested locking with pty pairs.
+ * tty locks which use nested locking:
+ *
+ * legacy_mutex - Nested tty locks are necessary for releasing pty pairs.
+ *		  The stable lock order is master pty first, then slave pty.
+ */
+
+enum {
+	TTY_LOCK_NORMAL = 0,
+	TTY_LOCK_SLAVE,
+};
 
 /*
  * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
-- 
cgit v1.2.3-59-g8ed1b


From 1d1d14da12e79a6c05fbe1a975401f0f56c93316 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Sat, 17 Jan 2015 15:42:05 -0500
Subject: pty: Fix buffer flush deadlock

The pty driver does not clear its write buffer when commanded.
This is to avoid an apparent deadlock between parallel flushes from
both pty ends; specifically when handling either BRK or INTR input.
However, parallel flushes from this source is not possible since
the pty master can never be set to BRKINT or ISIG. Parallel flushes
from other sources are possible but these do not threaten deadlocks.

Annotate the tty buffer mutex for lockdep to represent the nested
tty_buffer locking which occurs when the pty slave is processing input
(its buffer mutex held) and receives INTR or BRK and acquires the
linked tty buffer mutex via tty_buffer_flush().

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/pty.c        | 10 +++++++++-
 drivers/tty/tty_buffer.c |  6 ++++++
 include/linux/tty.h      |  4 ++++
 3 files changed, 19 insertions(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index f882ac81b93a..0e273158edac 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -212,10 +212,16 @@ static int pty_signal(struct tty_struct *tty, int sig)
 static void pty_flush_buffer(struct tty_struct *tty)
 {
 	struct tty_struct *to = tty->link;
+	struct tty_ldisc *ld;
 
 	if (!to)
 		return;
-	/* tty_buffer_flush(to); FIXME */
+
+	ld = tty_ldisc_ref(to);
+	tty_buffer_flush(to, ld);
+	if (ld)
+		tty_ldisc_deref(ld);
+
 	if (to->packet) {
 		spin_lock_irq(&tty->ctrl_lock);
 		tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
@@ -425,6 +431,8 @@ static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
 	tty->port = ports[1];
 	o_tty->port->itty = o_tty;
 
+	tty_buffer_set_lock_subclass(o_tty->port);
+
 	tty_driver_kref_get(driver);
 	tty->count++;
 	o_tty->count++;
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 3605103fc1ac..75661641f5fe 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -557,3 +557,9 @@ int tty_buffer_set_limit(struct tty_port *port, int limit)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(tty_buffer_set_limit);
+
+/* slave ptys can claim nested buffer lock when handling BRK and INTR */
+void tty_buffer_set_lock_subclass(struct tty_port *port)
+{
+	lockdep_set_subclass(&port->buf.lock, TTY_LOCK_SLAVE);
+}
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 849659908f23..55964b9490dd 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -25,6 +25,9 @@
  *
  * legacy_mutex - Nested tty locks are necessary for releasing pty pairs.
  *		  The stable lock order is master pty first, then slave pty.
+ * tty_buffer lock - slave ptys can claim nested buffer lock when handling
+ *		     signal chars. The stable lock order is slave pty, then
+ *		     master.
  */
 
 enum {
@@ -460,6 +463,7 @@ extern void tty_flush_to_ldisc(struct tty_struct *tty);
 extern void tty_buffer_free_all(struct tty_port *port);
 extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
 extern void tty_buffer_init(struct tty_port *port);
+extern void tty_buffer_set_lock_subclass(struct tty_port *port);
 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
-- 
cgit v1.2.3-59-g8ed1b


From d2b6f44779d3be22d32a5697bd30b59367fd2b33 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Sat, 17 Jan 2015 15:42:06 -0500
Subject: n_tty: Fix signal handling flushes

BRKINT and ISIG requires input and output flush when a signal char
is received. However, the order of operations is significant since
parallel i/o may be ongoing.

Merge the signal handling for BRKINT with ISIG handling.

Process the signal first. This ensures any ongoing i/o is aborted;
without this, a waiting writer may continue writing after the flush
occurs and after the signal char has been echoed.

Write lock the termios_rwsem, which excludes parallel writers from
pushing new i/o until after the output buffers are flushed; claiming
the write lock is necessary anyway to exclude parallel readers while
the read buffer is flushed.

Subclass the termios_rwsem for ptys since the slave pty performing
the flush may appear to reorder the termios_rwsem->tty buffer lock
lock order; adding annotation clarifies that
  slave tty_buffer lock-> slave termios_rwsem -> master tty_buffer lock
is a valid lock order.

Flush the echo buffer. In this context, the echo buffer is 'output'.
Otherwise, the output will appear discontinuous because the output buffer
was cleared which contains older output than the echo buffer.

Open-code the read buffer flush since the input worker does not need
kicking (this is the input worker).

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/n_tty.c | 45 ++++++++++++++++++++++++++++++---------------
 drivers/tty/pty.c   |  1 +
 include/linux/tty.h |  3 +++
 3 files changed, 34 insertions(+), 15 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 5793aa0d3bfb..cf6e0f2e1331 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1090,16 +1090,45 @@ static void eraser(unsigned char c, struct tty_struct *tty)
  *	Called when a signal is being sent due to terminal input.
  *	Called from the driver receive_buf path so serialized.
  *
+ *	Performs input and output flush if !NOFLSH. In this context, the echo
+ *	buffer is 'output'. The signal is processed first to alert any current
+ *	readers or writers to discontinue and exit their i/o loops.
+ *
  *	Locking: ctrl_lock
  */
 
 static void isig(int sig, struct tty_struct *tty)
 {
+	struct n_tty_data *ldata = tty->disc_data;
 	struct pid *tty_pgrp = tty_get_pgrp(tty);
 	if (tty_pgrp) {
 		kill_pgrp(tty_pgrp, sig, 1);
 		put_pid(tty_pgrp);
 	}
+
+	if (!L_NOFLSH(tty)) {
+		up_read(&tty->termios_rwsem);
+		down_write(&tty->termios_rwsem);
+
+		/* clear echo buffer */
+		mutex_lock(&ldata->output_lock);
+		ldata->echo_head = ldata->echo_tail = 0;
+		ldata->echo_mark = ldata->echo_commit = 0;
+		mutex_unlock(&ldata->output_lock);
+
+		/* clear output buffer */
+		tty_driver_flush_buffer(tty);
+
+		/* clear input buffer */
+		reset_buffer_flags(tty->disc_data);
+
+		/* notify pty master of flush */
+		if (tty->link)
+			n_tty_packet_mode_flush(tty);
+
+		up_write(&tty->termios_rwsem);
+		down_read(&tty->termios_rwsem);
+	}
 }
 
 /**
@@ -1123,13 +1152,6 @@ static void n_tty_receive_break(struct tty_struct *tty)
 		return;
 	if (I_BRKINT(tty)) {
 		isig(SIGINT, tty);
-		if (!L_NOFLSH(tty)) {
-			/* flushing needs exclusive termios_rwsem */
-			up_read(&tty->termios_rwsem);
-			n_tty_flush_buffer(tty);
-			tty_driver_flush_buffer(tty);
-			down_read(&tty->termios_rwsem);
-		}
 		return;
 	}
 	if (I_PARMRK(tty)) {
@@ -1203,13 +1225,7 @@ static void n_tty_receive_parity_error(struct tty_struct *tty, unsigned char c)
 static void
 n_tty_receive_signal_char(struct tty_struct *tty, int signal, unsigned char c)
 {
-	if (!L_NOFLSH(tty)) {
-		/* flushing needs exclusive termios_rwsem */
-		up_read(&tty->termios_rwsem);
-		n_tty_flush_buffer(tty);
-		tty_driver_flush_buffer(tty);
-		down_read(&tty->termios_rwsem);
-	}
+	isig(signal, tty);
 	if (I_IXON(tty))
 		start_tty(tty);
 	if (L_ECHO(tty)) {
@@ -1217,7 +1233,6 @@ n_tty_receive_signal_char(struct tty_struct *tty, int signal, unsigned char c)
 		commit_echoes(tty);
 	} else
 		process_echoes(tty);
-	isig(signal, tty);
 	return;
 }
 
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 0e273158edac..e72ee629cead 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -395,6 +395,7 @@ static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
 		goto err_put_module;
 
 	tty_set_lock_subclass(o_tty);
+	lockdep_set_subclass(&o_tty->termios_rwsem, TTY_LOCK_SLAVE);
 
 	if (legacy) {
 		/* We always use new tty termios data so we can do this
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 55964b9490dd..fe5623c9af71 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -25,6 +25,9 @@
  *
  * legacy_mutex - Nested tty locks are necessary for releasing pty pairs.
  *		  The stable lock order is master pty first, then slave pty.
+ * termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem.
+ *		   Subclassing this lock enables the slave pty to hold its
+ *		   termios_rwsem when claiming the master tty_buffer lock.
  * tty_buffer lock - slave ptys can claim nested buffer lock when handling
  *		     signal chars. The stable lock order is slave pty, then
  *		     master.
-- 
cgit v1.2.3-59-g8ed1b


From b164c9721e3ea4c08a4738cd4d0538bbb0c24419 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Thu, 22 Jan 2015 12:24:25 -0500
Subject: serial: core: Simplify console suspend logic in uart_suspend_port()

When the uart port being suspended is a console and consoles are
not suspending (kernel command line contains no_console_suspend),
then no action is performed for that port, and the function can
return early.

If the function has not returned early, then one of the conditions
is not true, so the expression
   (console_suspend_enabled || !uart_console(uport))
must be true and can be eliminated.

Similarly, the expression
   (console_suspend_enabled && uart_console(uport))
simplifies to just uart_console(uport).

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/serial_core.c | 35 +++++++++++++++++------------------
 1 file changed, 17 insertions(+), 18 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 984605bb5bf1..2c67a077042a 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2008,23 +2008,24 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
 	}
 	put_device(tty_dev);
 
-	if (console_suspend_enabled || !uart_console(uport))
-		uport->suspended = 1;
+	/* Nothing to do if the console is not suspending */
+	if (!console_suspend_enabled && uart_console(uport))
+		goto unlock;
+
+	uport->suspended = 1;
 
 	if (port->flags & ASYNC_INITIALIZED) {
 		const struct uart_ops *ops = uport->ops;
 		int tries;
 
-		if (console_suspend_enabled || !uart_console(uport)) {
-			set_bit(ASYNCB_SUSPENDED, &port->flags);
-			clear_bit(ASYNCB_INITIALIZED, &port->flags);
-
-			spin_lock_irq(&uport->lock);
-			ops->stop_tx(uport);
-			ops->set_mctrl(uport, 0);
-			ops->stop_rx(uport);
-			spin_unlock_irq(&uport->lock);
-		}
+		set_bit(ASYNCB_SUSPENDED, &port->flags);
+		clear_bit(ASYNCB_INITIALIZED, &port->flags);
+
+		spin_lock_irq(&uport->lock);
+		ops->stop_tx(uport);
+		ops->set_mctrl(uport, 0);
+		ops->stop_rx(uport);
+		spin_unlock_irq(&uport->lock);
 
 		/*
 		 * Wait for the transmitter to empty.
@@ -2036,19 +2037,17 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
 				drv->dev_name,
 				drv->tty_driver->name_base + uport->line);
 
-		if (console_suspend_enabled || !uart_console(uport))
-			ops->shutdown(uport);
+		ops->shutdown(uport);
 	}
 
 	/*
 	 * Disable the console device before suspending.
 	 */
-	if (console_suspend_enabled && uart_console(uport))
+	if (uart_console(uport))
 		console_stop(uport->cons);
 
-	if (console_suspend_enabled || !uart_console(uport))
-		uart_change_pm(state, UART_PM_STATE_OFF);
-
+	uart_change_pm(state, UART_PM_STATE_OFF);
+unlock:
 	mutex_unlock(&port->mutex);
 
 	return 0;
-- 
cgit v1.2.3-59-g8ed1b


From 01ba8d6af4b76aee99a8ae3a76748c8c36db49f3 Mon Sep 17 00:00:00 2001
From: Johannes Thumshirn <johannes.thumshirn@men.de>
Date: Mon, 19 Jan 2015 07:44:41 +0100
Subject: tty: serial: men_z135_uart: Fix driver for changes in hardware

16z135 IP Core has changed so the driver needs to be updated to respect
these changes. The following changes have been made:

* Don't invert the 16z135 modem status register when reading.
* Add module parameter to configure the (baud rate dependent) RX timeout.
  Character timeout in seconds = (timeout_reg * baud_reg * 4)/freq_reg.
* Enable the handling of UART core's automatic flow control feature.
  When AFE is active disable generation of modem status IRQs.
* Rework the handling of IRQs to be conform with newer FPGA versions and
  take precautions not to miss an interrupt because of the destructive read
  of the IIR register.
* Correct men_z135_handle_modem_status(), MSR is stat_reg[15:8] not
  stat_reg[7:0]
* Correct calling of uart_handle_{dcd,cts}_change()
* Reset CLOCAL when CRTSCTS is set

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@men.de>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/men_z135_uart.c | 155 ++++++++++++++++++++++++++-----------
 1 file changed, 109 insertions(+), 46 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c
index 517cd073dc08..35c55505b3eb 100644
--- a/drivers/tty/serial/men_z135_uart.c
+++ b/drivers/tty/serial/men_z135_uart.c
@@ -23,7 +23,6 @@
 #define MEN_Z135_MAX_PORTS		12
 #define MEN_Z135_BASECLK		29491200
 #define MEN_Z135_FIFO_SIZE		1024
-#define MEN_Z135_NUM_MSI_VECTORS	2
 #define MEN_Z135_FIFO_WATERMARK		1020
 
 #define MEN_Z135_STAT_REG		0x0
@@ -34,12 +33,11 @@
 #define MEN_Z135_CONF_REG		0x808
 #define MEN_Z135_UART_FREQ		0x80c
 #define MEN_Z135_BAUD_REG		0x810
-#define MENZ135_TIMEOUT			0x814
+#define MEN_Z135_TIMEOUT		0x814
 
 #define MEN_Z135_MEM_SIZE		0x818
 
-#define IS_IRQ(x) ((x) & 1)
-#define IRQ_ID(x) (((x) >> 1) & 7)
+#define IRQ_ID(x) ((x) & 0x1f)
 
 #define MEN_Z135_IER_RXCIEN BIT(0)		/* RX Space IRQ */
 #define MEN_Z135_IER_TXCIEN BIT(1)		/* TX Space IRQ */
@@ -94,11 +92,11 @@
 #define MEN_Z135_LSR_TEXP BIT(6)
 #define MEN_Z135_LSR_RXFIFOERR BIT(7)
 
-#define MEN_Z135_IRQ_ID_MST 0
-#define MEN_Z135_IRQ_ID_TSA 1
-#define MEN_Z135_IRQ_ID_RDA 2
-#define MEN_Z135_IRQ_ID_RLS 3
-#define MEN_Z135_IRQ_ID_CTI 6
+#define MEN_Z135_IRQ_ID_RLS BIT(0)
+#define MEN_Z135_IRQ_ID_RDA BIT(1)
+#define MEN_Z135_IRQ_ID_CTI BIT(2)
+#define MEN_Z135_IRQ_ID_TSA BIT(3)
+#define MEN_Z135_IRQ_ID_MST BIT(4)
 
 #define LCR(x) (((x) >> MEN_Z135_LCR_SHIFT) & 0xff)
 
@@ -118,12 +116,18 @@ static int align;
 module_param(align, int, S_IRUGO);
 MODULE_PARM_DESC(align, "Keep hardware FIFO write pointer aligned, default 0");
 
+static uint rx_timeout;
+module_param(rx_timeout, uint, S_IRUGO);
+MODULE_PARM_DESC(rx_timeout, "RX timeout. "
+		"Timeout in seconds = (timeout_reg * baud_reg * 4) / freq_reg");
+
 struct men_z135_port {
 	struct uart_port port;
 	struct mcb_device *mdev;
 	unsigned char *rxbuf;
 	u32 stat_reg;
 	spinlock_t lock;
+	bool automode;
 };
 #define to_men_z135(port) container_of((port), struct men_z135_port, port)
 
@@ -180,12 +184,16 @@ static inline void men_z135_reg_clr(struct men_z135_port *uart,
  */
 static void men_z135_handle_modem_status(struct men_z135_port *uart)
 {
-	if (uart->stat_reg & MEN_Z135_MSR_DDCD)
+	u8 msr;
+
+	msr = (uart->stat_reg >> 8) & 0xff;
+
+	if (msr & MEN_Z135_MSR_DDCD)
 		uart_handle_dcd_change(&uart->port,
-				uart->stat_reg & ~MEN_Z135_MSR_DCD);
-	if (uart->stat_reg & MEN_Z135_MSR_DCTS)
+				msr & MEN_Z135_MSR_DCD);
+	if (msr & MEN_Z135_MSR_DCTS)
 		uart_handle_cts_change(&uart->port,
-				uart->stat_reg & ~MEN_Z135_MSR_CTS);
+				msr & MEN_Z135_MSR_CTS);
 }
 
 static void men_z135_handle_lsr(struct men_z135_port *uart)
@@ -322,7 +330,8 @@ static void men_z135_handle_tx(struct men_z135_port *uart)
 
 	txfree = MEN_Z135_FIFO_WATERMARK - txc;
 	if (txfree <= 0) {
-		pr_err("Not enough room in TX FIFO have %d, need %d\n",
+		dev_err(&uart->mdev->dev,
+			"Not enough room in TX FIFO have %d, need %d\n",
 			txfree, qlen);
 		goto irq_en;
 	}
@@ -373,43 +382,54 @@ out:
  * @irq: The IRQ number
  * @data: Pointer to UART port
  *
- * Check IIR register to see which tasklet to start.
+ * Check IIR register to find the cause of the interrupt and handle it.
+ * It is possible that multiple interrupts reason bits are set and reading
+ * the IIR is a destructive read, so we always need to check for all possible
+ * interrupts and handle them.
  */
 static irqreturn_t men_z135_intr(int irq, void *data)
 {
 	struct men_z135_port *uart = (struct men_z135_port *)data;
 	struct uart_port *port = &uart->port;
+	bool handled = false;
+	unsigned long flags;
 	int irq_id;
 
 	uart->stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
-	/* IRQ pending is low active */
-	if (IS_IRQ(uart->stat_reg))
-		return IRQ_NONE;
-
 	irq_id = IRQ_ID(uart->stat_reg);
-	switch (irq_id) {
-	case MEN_Z135_IRQ_ID_MST:
-		men_z135_handle_modem_status(uart);
-		break;
-	case MEN_Z135_IRQ_ID_TSA:
-		men_z135_handle_tx(uart);
-		break;
-	case MEN_Z135_IRQ_ID_CTI:
-		dev_dbg(&uart->mdev->dev, "Character Timeout Indication\n");
-		/* Fallthrough */
-	case MEN_Z135_IRQ_ID_RDA:
-		/* Reading data clears RX IRQ */
-		men_z135_handle_rx(uart);
-		break;
-	case MEN_Z135_IRQ_ID_RLS:
+
+	if (!irq_id)
+		goto out;
+
+	spin_lock_irqsave(&port->lock, flags);
+	/* It's save to write to IIR[7:6] RXC[9:8] */
+	iowrite8(irq_id, port->membase + MEN_Z135_STAT_REG);
+
+	if (irq_id & MEN_Z135_IRQ_ID_RLS) {
 		men_z135_handle_lsr(uart);
-		break;
-	default:
-		dev_warn(&uart->mdev->dev, "Unknown IRQ id %d\n", irq_id);
-		return IRQ_NONE;
+		handled = true;
+	}
+
+	if (irq_id & (MEN_Z135_IRQ_ID_RDA | MEN_Z135_IRQ_ID_CTI)) {
+		if (irq_id & MEN_Z135_IRQ_ID_CTI)
+			dev_dbg(&uart->mdev->dev, "Character Timeout Indication\n");
+		men_z135_handle_rx(uart);
+		handled = true;
+	}
+
+	if (irq_id & MEN_Z135_IRQ_ID_TSA) {
+		men_z135_handle_tx(uart);
+		handled = true;
 	}
 
-	return IRQ_HANDLED;
+	if (irq_id & MEN_Z135_IRQ_ID_MST) {
+		men_z135_handle_modem_status(uart);
+		handled = true;
+	}
+
+	spin_unlock_irqrestore(&port->lock, flags);
+out:
+	return IRQ_RETVAL(handled);
 }
 
 /**
@@ -464,21 +484,37 @@ static unsigned int men_z135_tx_empty(struct uart_port *port)
  */
 static void men_z135_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
-	struct men_z135_port *uart = to_men_z135(port);
-	u32 conf_reg = 0;
+	u32 old;
+	u32 conf_reg;
 
+	conf_reg = old = ioread32(port->membase + MEN_Z135_CONF_REG);
 	if (mctrl & TIOCM_RTS)
 		conf_reg |= MEN_Z135_MCR_RTS;
+	else
+		conf_reg &= ~MEN_Z135_MCR_RTS;
+
 	if (mctrl & TIOCM_DTR)
 		conf_reg |= MEN_Z135_MCR_DTR;
+	else
+		conf_reg &= ~MEN_Z135_MCR_DTR;
+
 	if (mctrl & TIOCM_OUT1)
 		conf_reg |= MEN_Z135_MCR_OUT1;
+	else
+		conf_reg &= ~MEN_Z135_MCR_OUT1;
+
 	if (mctrl & TIOCM_OUT2)
 		conf_reg |= MEN_Z135_MCR_OUT2;
+	else
+		conf_reg &= ~MEN_Z135_MCR_OUT2;
+
 	if (mctrl & TIOCM_LOOP)
 		conf_reg |= MEN_Z135_MCR_LOOP;
+	else
+		conf_reg &= ~MEN_Z135_MCR_LOOP;
 
-	men_z135_reg_set(uart, MEN_Z135_CONF_REG, conf_reg);
+	if (conf_reg != old)
+		iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);
 }
 
 /**
@@ -490,12 +526,9 @@ static void men_z135_set_mctrl(struct uart_port *port, unsigned int mctrl)
 static unsigned int men_z135_get_mctrl(struct uart_port *port)
 {
 	unsigned int mctrl = 0;
-	u32 stat_reg;
 	u8 msr;
 
-	stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
-
-	msr = ~((stat_reg >> 8) & 0xff);
+	msr = ioread8(port->membase + MEN_Z135_STAT_REG + 1);
 
 	if (msr & MEN_Z135_MSR_CTS)
 		mctrl |= TIOCM_CTS;
@@ -524,6 +557,19 @@ static void men_z135_stop_tx(struct uart_port *port)
 	men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
 }
 
+/*
+ * men_z135_disable_ms() - Disable Modem Status
+ * port: The UART port
+ *
+ * Enable Modem Status IRQ.
+ */
+static void men_z135_disable_ms(struct uart_port *port)
+{
+	struct men_z135_port *uart = to_men_z135(port);
+
+	men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_MSIEN);
+}
+
 /**
  * men_z135_start_tx() - Start transmitting characters
  * @port: The UART port
@@ -535,6 +581,9 @@ static void men_z135_start_tx(struct uart_port *port)
 {
 	struct men_z135_port *uart = to_men_z135(port);
 
+	if (uart->automode)
+		men_z135_disable_ms(port);
+
 	men_z135_handle_tx(uart);
 }
 
@@ -584,6 +633,9 @@ static int men_z135_startup(struct uart_port *port)
 
 	iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);
 
+	if (rx_timeout)
+		iowrite32(rx_timeout, port->membase + MEN_Z135_TIMEOUT);
+
 	return 0;
 }
 
@@ -603,6 +655,7 @@ static void men_z135_set_termios(struct uart_port *port,
 				struct ktermios *termios,
 				struct ktermios *old)
 {
+	struct men_z135_port *uart = to_men_z135(port);
 	unsigned int baud;
 	u32 conf_reg;
 	u32 bd_reg;
@@ -643,6 +696,16 @@ static void men_z135_set_termios(struct uart_port *port,
 	} else
 		lcr |= MEN_Z135_PAR_DIS << MEN_Z135_PEN_SHIFT;
 
+	conf_reg |= MEN_Z135_IER_MSIEN;
+	if (termios->c_cflag & CRTSCTS) {
+		conf_reg |= MEN_Z135_MCR_RCFC;
+		uart->automode = true;
+		termios->c_cflag &= ~CLOCAL;
+	} else {
+		conf_reg &= ~MEN_Z135_MCR_RCFC;
+		uart->automode = false;
+	}
+
 	termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
 
 	conf_reg |= lcr << MEN_Z135_LCR_SHIFT;
-- 
cgit v1.2.3-59-g8ed1b


From d1f2f219319813070c022e841f48bfd0fe17fd34 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Thu, 22 Jan 2015 12:24:26 -0500
Subject: serial: 8250: Move UART_BUG_QUOT workaround

The UART_BUG_QUOT workaround adjusts the divisor computed from the
baud rate by serial8250_get_divisor(). Move the workaround into
serial8250_get_divisor(), so that divisor-from-baud computation
is encapsulated.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_core.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index df8a5aa96bc6..8e3302c6bbff 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -2413,8 +2413,9 @@ static void serial8250_shutdown(struct uart_port *port)
 		serial8250_do_shutdown(port);
 }
 
-static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud)
+static unsigned int serial8250_get_divisor(struct uart_8250_port *up, unsigned int baud)
 {
+	struct uart_port *port = &up->port;
 	unsigned int quot;
 
 	/*
@@ -2430,6 +2431,12 @@ static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int
 	else
 		quot = uart_get_divisor(port, baud);
 
+	/*
+	 * Oxford Semi 952 rev B workaround
+	 */
+	if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0)
+		quot++;
+
 	return quot;
 }
 
@@ -2478,13 +2485,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 	baud = uart_get_baud_rate(port, termios, old,
 				  port->uartclk / 16 / 0xffff,
 				  port->uartclk / 16);
-	quot = serial8250_get_divisor(port, baud);
-
-	/*
-	 * Oxford Semi 952 rev B workaround
-	 */
-	if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0)
-		quot++;
+	quot = serial8250_get_divisor(up, baud);
 
 	if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) {
 		/* NOTE: If fifo_bug is not set, a user can set RX_trigger. */
-- 
cgit v1.2.3-59-g8ed1b


From 0ec3f585cfb503a18b82cd181c9bf32b45a24f5e Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Thu, 22 Jan 2015 12:24:27 -0500
Subject: serial: 8250: Refactor LCR computation

Refactor the computation of the LCR register value from termios c_cflag
into a new local function, serial8250_compute_lcr().

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_core.c | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 8e3302c6bbff..b63b9c352cc2 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -2440,16 +2440,12 @@ static unsigned int serial8250_get_divisor(struct uart_8250_port *up, unsigned i
 	return quot;
 }
 
-void
-serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
-		          struct ktermios *old)
+static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
+					    tcflag_t c_cflag)
 {
-	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned char cval;
-	unsigned long flags;
-	unsigned int baud, quot;
 
-	switch (termios->c_cflag & CSIZE) {
+	switch (c_cflag & CSIZE) {
 	case CS5:
 		cval = UART_LCR_WLEN5;
 		break;
@@ -2465,20 +2461,34 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 		break;
 	}
 
-	if (termios->c_cflag & CSTOPB)
+	if (c_cflag & CSTOPB)
 		cval |= UART_LCR_STOP;
-	if (termios->c_cflag & PARENB) {
+	if (c_cflag & PARENB) {
 		cval |= UART_LCR_PARITY;
 		if (up->bugs & UART_BUG_PARITY)
 			up->fifo_bug = true;
 	}
-	if (!(termios->c_cflag & PARODD))
+	if (!(c_cflag & PARODD))
 		cval |= UART_LCR_EPAR;
 #ifdef CMSPAR
-	if (termios->c_cflag & CMSPAR)
+	if (c_cflag & CMSPAR)
 		cval |= UART_LCR_SPAR;
 #endif
 
+	return cval;
+}
+
+void
+serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
+		          struct ktermios *old)
+{
+	struct uart_8250_port *up = up_to_u8250p(port);
+	unsigned char cval;
+	unsigned long flags;
+	unsigned int baud, quot;
+
+	cval = serial8250_compute_lcr(up, termios->c_cflag);
+
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-- 
cgit v1.2.3-59-g8ed1b


From e72abd5da0730dfc4c8f566f7896c15c2d1bb88f Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Thu, 22 Jan 2015 12:24:28 -0500
Subject: serial: 8250: Refactor divisor programming

Refactor divisor register programming into a new function,
serial8250_set_divisor; this allows serial console to reinitialize
early after resume from suspend.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_core.c | 87 ++++++++++++++++++++-----------------
 1 file changed, 48 insertions(+), 39 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index b63b9c352cc2..fd9e723926cd 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -2478,6 +2478,50 @@ static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
 	return cval;
 }
 
+void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
+			    unsigned int quot)
+{
+	struct uart_8250_port *up = up_to_u8250p(port);
+
+	/* Workaround to enable 115200 baud on OMAP1510 internal ports */
+	if (is_omap1510_8250(up)) {
+		if (baud == 115200) {
+			quot = 1;
+			serial_port_out(port, UART_OMAP_OSC_12M_SEL, 1);
+		} else
+			serial_port_out(port, UART_OMAP_OSC_12M_SEL, 0);
+	}
+
+	/*
+	 * For NatSemi, switch to bank 2 not bank 1, to avoid resetting EXCR2,
+	 * otherwise just set DLAB
+	 */
+	if (up->capabilities & UART_NATSEMI)
+		serial_port_out(port, UART_LCR, 0xe0);
+	else
+		serial_port_out(port, UART_LCR, up->lcr | UART_LCR_DLAB);
+
+	serial_dl_write(up, quot);
+
+	/*
+	 * XR17V35x UARTs have an extra fractional divisor register (DLD)
+	 *
+	 * We need to recalculate all of the registers, because DLM and DLL
+	 * are already rounded to a whole integer.
+	 *
+	 * When recalculating we use a 32x clock instead of a 16x clock to
+	 * allow 1-bit for rounding in the fractional part.
+	 */
+	if (up->port.type == PORT_XR17V35X) {
+		unsigned int baud_x32 = (port->uartclk * 2) / baud;
+		u16 quot = baud_x32 / 32;
+		u8 quot_frac = DIV_ROUND_CLOSEST(baud_x32 % 32, 2);
+
+		serial_dl_write(up, quot);
+		serial_port_out(port, 0x2, quot_frac & 0xf);
+	}
+}
+
 void
 serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 		          struct ktermios *old)
@@ -2526,6 +2570,8 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 	serial8250_rpm_get(up);
 	spin_lock_irqsave(&port->lock, flags);
 
+	up->lcr = cval;					/* Save computed LCR */
+
 	/*
 	 * Update the per-port timeout.
 	 */
@@ -2590,43 +2636,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 			serial_port_out(port, UART_EFR, efr);
 	}
 
-	/* Workaround to enable 115200 baud on OMAP1510 internal ports */
-	if (is_omap1510_8250(up)) {
-		if (baud == 115200) {
-			quot = 1;
-			serial_port_out(port, UART_OMAP_OSC_12M_SEL, 1);
-		} else
-			serial_port_out(port, UART_OMAP_OSC_12M_SEL, 0);
-	}
-
-	/*
-	 * For NatSemi, switch to bank 2 not bank 1, to avoid resetting EXCR2,
-	 * otherwise just set DLAB
-	 */
-	if (up->capabilities & UART_NATSEMI)
-		serial_port_out(port, UART_LCR, 0xe0);
-	else
-		serial_port_out(port, UART_LCR, cval | UART_LCR_DLAB);
-
-	serial_dl_write(up, quot);
-
-	/*
-	 * XR17V35x UARTs have an extra fractional divisor register (DLD)
-	 *
-	 * We need to recalculate all of the registers, because DLM and DLL
-	 * are already rounded to a whole integer.
-	 *
-	 * When recalculating we use a 32x clock instead of a 16x clock to
-	 * allow 1-bit for rounding in the fractional part.
-	 */
-	if (up->port.type == PORT_XR17V35X) {
-		unsigned int baud_x32 = (port->uartclk * 2) / baud;
-		u16 quot = baud_x32 / 32;
-		u8 quot_frac = DIV_ROUND_CLOSEST(baud_x32 % 32, 2);
-
-		serial_dl_write(up, quot);
-		serial_port_out(port, 0x2, quot_frac & 0xf);
-	}
+	serial8250_set_divisor(port, baud, quot);
 
 	/*
 	 * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR
@@ -2635,8 +2645,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 	if (port->type == PORT_16750)
 		serial_port_out(port, UART_FCR, up->fcr);
 
-	serial_port_out(port, UART_LCR, cval);		/* reset DLAB */
-	up->lcr = cval;					/* Save LCR */
+	serial_port_out(port, UART_LCR, up->lcr);	/* reset DLAB */
 	if (port->type != PORT_16750) {
 		/* emulated UARTs (Lucent Venus 167x) need two steps */
 		if (up->fcr & UART_FCR_ENABLE_FIFO)
-- 
cgit v1.2.3-59-g8ed1b


From 06a4c710673184f5c750bdb2f8579e0ae1cc252c Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Thu, 22 Jan 2015 12:24:29 -0500
Subject: serial: 8250: Refactor XR17V35X divisor calculation

Exar XR17V35X PCIe uarts support a 4-bit fractional divisor register.
Refactor the divisor calculation from the divisor programming.

Allow a fractional result from serial8250_get_divisor() and pass this
result to serial8250_dl_write().

Simplify the calculation for quot and quot_frac. This was verified
to be identical to the results of the original calculation with a test
jig.

NB: The results were also compared with the divisor value chart
on pg 33 of the Exar XR17V352 datasheet, rev 1.0.3, here:
http://www.exar.com/common/content/document.ashx?id=1585
which differs from the calculated values by 1 in the fractional result.
This is because the calculated values are still rounded in the
fractional result, whereas the table values are truncated. Note
that the data error rate % values in the datasheet are for
rounded fractional results, as the truncated fractional results
have more error.

Cc: Joe Schultz <jschultz@xes-inc.com>
Cc: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_core.c | 52 +++++++++++++++++++++----------------
 1 file changed, 30 insertions(+), 22 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index fd9e723926cd..c8ecfaf49eb4 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -2413,7 +2413,26 @@ static void serial8250_shutdown(struct uart_port *port)
 		serial8250_do_shutdown(port);
 }
 
-static unsigned int serial8250_get_divisor(struct uart_8250_port *up, unsigned int baud)
+/*
+ * XR17V35x UARTs have an extra fractional divisor register (DLD)
+ * Calculate divisor with extra 4-bit fractional portion
+ */
+static unsigned int xr17v35x_get_divisor(struct uart_8250_port *up,
+					 unsigned int baud,
+					 unsigned int *frac)
+{
+	struct uart_port *port = &up->port;
+	unsigned int quot_16;
+
+	quot_16 = DIV_ROUND_CLOSEST(port->uartclk, baud);
+	*frac = quot_16 & 0x0f;
+
+	return quot_16 >> 4;
+}
+
+static unsigned int serial8250_get_divisor(struct uart_8250_port *up,
+					   unsigned int baud,
+					   unsigned int *frac)
 {
 	struct uart_port *port = &up->port;
 	unsigned int quot;
@@ -2421,6 +2440,7 @@ static unsigned int serial8250_get_divisor(struct uart_8250_port *up, unsigned i
 	/*
 	 * Handle magic divisors for baud rates above baud_base on
 	 * SMSC SuperIO chips.
+	 *
 	 */
 	if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
 	    baud == (port->uartclk/4))
@@ -2428,6 +2448,8 @@ static unsigned int serial8250_get_divisor(struct uart_8250_port *up, unsigned i
 	else if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
 		 baud == (port->uartclk/8))
 		quot = 0x8002;
+	else if (up->port.type == PORT_XR17V35X)
+		quot = xr17v35x_get_divisor(up, baud, frac);
 	else
 		quot = uart_get_divisor(port, baud);
 
@@ -2479,7 +2501,7 @@ static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
 }
 
 void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
-			    unsigned int quot)
+			    unsigned int quot, unsigned int quot_frac)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
 
@@ -2503,23 +2525,9 @@ void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
 
 	serial_dl_write(up, quot);
 
-	/*
-	 * XR17V35x UARTs have an extra fractional divisor register (DLD)
-	 *
-	 * We need to recalculate all of the registers, because DLM and DLL
-	 * are already rounded to a whole integer.
-	 *
-	 * When recalculating we use a 32x clock instead of a 16x clock to
-	 * allow 1-bit for rounding in the fractional part.
-	 */
-	if (up->port.type == PORT_XR17V35X) {
-		unsigned int baud_x32 = (port->uartclk * 2) / baud;
-		u16 quot = baud_x32 / 32;
-		u8 quot_frac = DIV_ROUND_CLOSEST(baud_x32 % 32, 2);
-
-		serial_dl_write(up, quot);
-		serial_port_out(port, 0x2, quot_frac & 0xf);
-	}
+	/* XR17V35x UARTs have an extra fractional divisor register (DLD) */
+	if (up->port.type == PORT_XR17V35X)
+		serial_port_out(port, 0x2, quot_frac);
 }
 
 void
@@ -2529,7 +2537,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned char cval;
 	unsigned long flags;
-	unsigned int baud, quot;
+	unsigned int baud, quot, frac = 0;
 
 	cval = serial8250_compute_lcr(up, termios->c_cflag);
 
@@ -2539,7 +2547,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 	baud = uart_get_baud_rate(port, termios, old,
 				  port->uartclk / 16 / 0xffff,
 				  port->uartclk / 16);
-	quot = serial8250_get_divisor(up, baud);
+	quot = serial8250_get_divisor(up, baud, &frac);
 
 	if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) {
 		/* NOTE: If fifo_bug is not set, a user can set RX_trigger. */
@@ -2636,7 +2644,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 			serial_port_out(port, UART_EFR, efr);
 	}
 
-	serial8250_set_divisor(port, baud, quot);
+	serial8250_set_divisor(port, baud, quot, frac);
 
 	/*
 	 * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR
-- 
cgit v1.2.3-59-g8ed1b


From 4516d50aabedbe5ae334155193e4d35c02390d9a Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Thu, 22 Jan 2015 12:24:30 -0500
Subject: serial: 8250: Use canary to restart console after suspend

When using no_console_suspend, the serial console may be powered off
anyway during system sleep. Upon resume, the port may be in its default
power-on state, but is expected to continue console i/o before the device
has received its pm callback. The resultant garbage i/o can cause all
kinds of havoc on the remote end.

Use the scratch register as a canary to discover if the console
has been powered-off. Write a non-zero value to the scratch register
at port suspend and reprogram the port before any console i/o if the
scratch register != canary before port resume.

This workaround is disabled for omap_8250 (which uses different divisor
programming).

Credit to Doug Anderson <dianders@chromium.org> for the idea of using
the scratch register canary to discover port power-down.

Cc: Doug Anderson <dianders@chromium.org>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_core.c | 35 ++++++++++++++++++++++++++++++++++-
 include/linux/serial_8250.h         |  3 +++
 2 files changed, 37 insertions(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index c8ecfaf49eb4..1449c56506b7 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -3267,6 +3267,27 @@ serial8250_console_write(struct console *co, const char *s, unsigned int count)
 	else
 		serial_port_out(port, UART_IER, 0);
 
+	/* check scratch reg to see if port powered off during system sleep */
+	if (up->canary && (up->canary != serial_port_in(port, UART_SCR))) {
+		struct ktermios termios;
+		unsigned int baud, quot, frac = 0;
+
+		termios.c_cflag = port->cons->cflag;
+		if (port->state->port.tty && termios.c_cflag == 0)
+			termios.c_cflag = port->state->port.tty->termios.c_cflag;
+
+		baud = uart_get_baud_rate(port, &termios, NULL,
+					  port->uartclk / 16 / 0xffff,
+					  port->uartclk / 16);
+		quot = serial8250_get_divisor(up, baud, &frac);
+
+		serial8250_set_divisor(port, baud, quot, frac);
+		serial_port_out(port, UART_LCR, up->lcr);
+		serial_port_out(port, UART_MCR, UART_MCR_DTR | UART_MCR_RTS);
+
+		up->canary = 0;
+	}
+
 	uart_console_write(port, s, count, serial8250_console_putchar);
 
 	/*
@@ -3417,7 +3438,17 @@ int __init early_serial_setup(struct uart_port *port)
  */
 void serial8250_suspend_port(int line)
 {
-	uart_suspend_port(&serial8250_reg, &serial8250_ports[line].port);
+	struct uart_8250_port *up = &serial8250_ports[line];
+	struct uart_port *port = &up->port;
+
+	if (!console_suspend_enabled && uart_console(port) &&
+	    port->type != PORT_8250) {
+		unsigned char canary = 0xa5;
+		serial_out(up, UART_SCR, canary);
+		up->canary = canary;
+	}
+
+	uart_suspend_port(&serial8250_reg, port);
 }
 
 /**
@@ -3431,6 +3462,8 @@ void serial8250_resume_port(int line)
 	struct uart_8250_port *up = &serial8250_ports[line];
 	struct uart_port *port = &up->port;
 
+	up->canary = 0;
+
 	if (up->capabilities & UART_NATSEMI) {
 		/* Ensure it's still in high speed mode */
 		serial_port_out(port, UART_LCR, 0xE0);
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index 245b959f1ff6..a8efa235b7c1 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -85,6 +85,9 @@ struct uart_8250_port {
 	unsigned char		mcr_force;	/* mask of forced bits */
 	unsigned char		cur_iotype;	/* Running I/O type */
 	unsigned int		rpm_tx_active;
+	unsigned char		canary;		/* non-zero during system sleep
+						 *   if no_console_suspend
+						 */
 
 	/*
 	 * Some bits in registers are cleared on a read, so they must
-- 
cgit v1.2.3-59-g8ed1b


From e9cef8625e997a5ade9cddd2d501257dfee7cb62 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Thu, 22 Jan 2015 12:24:31 -0500
Subject: serial: 8250: Prevent concurrent updates to shadow registers

The port shadow registers, ->fcr and ->mcr, must be protected from
concurrent updates. Relocate the shadow register updates in
serial8250_do_set_termios() to the port lock critical section.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_core.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 1449c56506b7..57d13b058a48 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -2549,6 +2549,15 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 				  port->uartclk / 16);
 	quot = serial8250_get_divisor(up, baud, &frac);
 
+	/*
+	 * Ok, we're now changing the port state.  Do it with
+	 * interrupts disabled.
+	 */
+	serial8250_rpm_get(up);
+	spin_lock_irqsave(&port->lock, flags);
+
+	up->lcr = cval;					/* Save computed LCR */
+
 	if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) {
 		/* NOTE: If fifo_bug is not set, a user can set RX_trigger. */
 		if ((baud < 2400 && !up->dma) || up->fifo_bug) {
@@ -2571,15 +2580,6 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 			up->mcr |= UART_MCR_AFE;
 	}
 
-	/*
-	 * Ok, we're now changing the port state.  Do it with
-	 * interrupts disabled.
-	 */
-	serial8250_rpm_get(up);
-	spin_lock_irqsave(&port->lock, flags);
-
-	up->lcr = cval;					/* Save computed LCR */
-
 	/*
 	 * Update the per-port timeout.
 	 */
-- 
cgit v1.2.3-59-g8ed1b


From 6d01bb9dc82a60580f749062a48cb47cd5caca07 Mon Sep 17 00:00:00 2001
From: Rob Herring <robh@kernel.org>
Date: Mon, 26 Jan 2015 22:50:07 -0600
Subject: tty/serial: of_serial: add DT alias ID handling

Add support for alias parsing from the DT. This allows for consistent
tty numbering.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/of_serial.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 64f1bab7e9d7..3194b42c97c0 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -128,6 +128,10 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	if (of_find_property(np, "no-loopback-test", NULL))
 		port->flags |= UPF_SKIP_TEST;
 
+	ret = of_alias_get_id(np, "serial");
+	if (ret >= 0)
+		port->line = ret;
+
 	port->dev = &ofdev->dev;
 
 	switch (type) {
-- 
cgit v1.2.3-59-g8ed1b


From 6ad991b699b4e74af980d08086a99badcb175b37 Mon Sep 17 00:00:00 2001
From: Rob Herring <robh@kernel.org>
Date: Mon, 26 Jan 2015 22:50:08 -0600
Subject: tty/serial: of_serial: add support for PXA/MMP uarts

Add mrvl,pxa-uart and mrvl,mmp-uart compatible strings for the of_serial
driver. These are 8250 variants which have a port type of PORT_XSCALE.

There is also the serial driver pxa.c with these compatible strings
already. However, it can be replaced with the common 8250 driver. It has
some issues like it cannot coexist with the 8250 driver due to tty name
collision. That also means adding these compatible strings here should
not case a problem.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/of_serial.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 3194b42c97c0..fbb719c89a61 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -335,6 +335,10 @@ static struct of_device_id of_platform_serial_table[] = {
 		.data = (void *)PORT_ALTR_16550_F64, },
 	{ .compatible = "altr,16550-FIFO128",
 		.data = (void *)PORT_ALTR_16550_F128, },
+	{ .compatible = "mrvl,mmp-uart",
+		.data = (void *)PORT_XSCALE, },
+	{ .compatible = "mrvl,pxa-uart",
+		.data = (void *)PORT_XSCALE, },
 #ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL
 	{ .compatible = "ibm,qpace-nwp-serial",
 		.data = (void *)PORT_NWPSERIAL, },
-- 
cgit v1.2.3-59-g8ed1b


From a4c639b04f301ddc3f71bc0f2600c3759846db43 Mon Sep 17 00:00:00 2001
From: Rob Herring <robh@kernel.org>
Date: Mon, 26 Jan 2015 22:50:09 -0600
Subject: tty/serial: 8250_early: Add support for PXA UARTs

The PXA variant of the 8250 UART adds a UART enable bit which must not
be cleared. Make the earlycon support maintain this bit if it is set.
This implies some initialization of the UART, but we cannot
unconditionally set the bit as some other variants require this bit to
be clear for other functions.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_early.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index ce2a8abd1f54..c31a22b4f845 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -93,10 +93,10 @@ static void __init early_serial8250_write(struct console *console,
 	struct uart_port *port = &early_device->port;
 	unsigned int ier;
 
-	/* Save the IER and disable interrupts */
+	/* Save the IER and disable interrupts preserving the UUE bit */
 	ier = serial8250_early_in(port, UART_IER);
 	if (ier)
-		serial8250_early_out(port, UART_IER, 0);
+		serial8250_early_out(port, UART_IER, ier & UART_IER_UUE);
 
 	uart_console_write(port, s, count, serial_putc);
 
@@ -127,9 +127,11 @@ static void __init init_port(struct earlycon_device *device)
 	struct uart_port *port = &device->port;
 	unsigned int divisor;
 	unsigned char c;
+	unsigned int ier;
 
 	serial8250_early_out(port, UART_LCR, 0x3);	/* 8n1 */
-	serial8250_early_out(port, UART_IER, 0);	/* no interrupt */
+	ier = serial8250_early_in(port, UART_IER);
+	serial8250_early_out(port, UART_IER, ier & UART_IER_UUE); /* no interrupt */
 	serial8250_early_out(port, UART_FCR, 0);	/* no fifo */
 	serial8250_early_out(port, UART_MCR, 0x3);	/* DTR + RTS */
 
-- 
cgit v1.2.3-59-g8ed1b


From 391f93f2ec9f857c83bdd21a14dcf7e699f38579 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Sun, 25 Jan 2015 14:44:51 -0500
Subject: serial: core: Rework hw-assisted flow control support

hw-assisted flow control support was added to the serial core
in v3.8 with commits,
dba05832cbe4f ("SERIAL: core: add hardware assisted h/w flow control support")
2cbacafd7af0f ("SERIAL: core: add hardware assisted s/w flow control support")
9aba8d5b01119 ("SERIAL: core: add throttle/unthrottle callbacks for hardware
                assisted flow control")
Since then, additional requirements for serial core support have arisen.
Specifically,
1. Separate tx and rx flow control settings for UARTs which only support
   tx flow control (ie., autoCTS).
2. Disable sw-assisted CTS flow control in autoCTS mode
3. Support for RTS flow control by serial core and userspace in autoRTS mode

Distinguish mode from capability; introduce UPSTAT_AUTORTS, UPSTAT_AUTOCTS
and UPSTAT_AUTOXOFF which, when set by the uart driver, enable serial core
support for hw-assisted rx, hw-assisted tx and hw-assisted in-band/IXOFF
rx flow control, respectively. [Note: hw-assisted in-band/IXON tx flow
control does not require serial core support/intervention and can be
enabled by the uart driver when required.]

These modes must be set/reset in the driver's set_termios() method, based
on termios settings, and thus can be safely queried in any context in which
one of the port lock, port mutex or termios rwsem are held. Set these modes
in the 2 in-tree drivers, omap-serial and 8250_omap, which currently
use UPF_HARD_FLOW/UPF_SOFT_FLOW support.

Retain UPF_HARD_FLOW and UPF_SOFT_FLOW as capabilities; re-define
UPF_HARD_FLOW as both UPF_AUTO_RTS and UPF_AUTO_CTS to allow for distinct
and separate rx and tx flow control capabilities.

Disable sw-assisted CTS flow control when UPSTAT_AUTOCTS is enabled.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_omap.c |  7 +++-
 drivers/tty/serial/omap-serial.c    |  7 +++-
 drivers/tty/serial/serial_core.c    | 76 ++++++++++++++-----------------------
 include/linux/serial_core.h         | 21 ++++++++--
 4 files changed, 59 insertions(+), 52 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 9191d05cfaf0..6e4ff7148ead 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -421,8 +421,11 @@ static void omap_8250_set_termios(struct uart_port *port,
 
 	priv->efr = 0;
 	up->mcr &= ~(UART_MCR_RTS | UART_MCR_XONANY);
+	up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF);
+
 	if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
 		/* Enable AUTORTS and AUTOCTS */
+		up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
 		priv->efr |= UART_EFR_CTS | UART_EFR_RTS;
 	} else	if (up->port.flags & UPF_SOFT_FLOW) {
 		/*
@@ -438,8 +441,10 @@ static void omap_8250_set_termios(struct uart_port *port,
 		 * Enable XON/XOFF flow control on output.
 		 * Transmit XON1, XOFF1
 		 */
-		if (termios->c_iflag & IXOFF)
+		if (termios->c_iflag & IXOFF) {
+			up->port.status |= UPSTAT_AUTOXOFF;
 			priv->efr |= OMAP_UART_SW_TX;
+		}
 
 		/*
 		 * IXANY Flag:
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index b1cf9a3b673a..6129fe515932 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1053,8 +1053,11 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 
 	serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
 
+	up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF);
+
 	if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
 		/* Enable AUTORTS and AUTOCTS */
+		up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
 		up->efr |= UART_EFR_CTS | UART_EFR_RTS;
 
 		/* Ensure MCR RTS is asserted */
@@ -1081,8 +1084,10 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 		 * Enable XON/XOFF flow control on output.
 		 * Transmit XON1, XOFF1
 		 */
-		if (termios->c_iflag & IXOFF)
+		if (termios->c_iflag & IXOFF) {
+			up->port.status |= UPSTAT_AUTOXOFF;
 			up->efr |= OMAP_UART_SW_TX;
+		}
 
 		/*
 		 * IXANY Flag:
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 2c67a077042a..6a1055ae3437 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -179,14 +179,6 @@ static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
 			if (tty->termios.c_cflag & CBAUD)
 				uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
 		}
-
-		spin_lock_irq(&uport->lock);
-		if (uart_cts_enabled(uport) &&
-		    !(uport->ops->get_mctrl(uport) & TIOCM_CTS))
-			uport->hw_stopped = 1;
-		else
-			uport->hw_stopped = 0;
-		spin_unlock_irq(&uport->lock);
 	}
 
 	/*
@@ -442,6 +434,7 @@ static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
 {
 	struct uart_port *uport = state->uart_port;
 	struct ktermios *termios;
+	int hw_stopped;
 
 	/*
 	 * If we have no tty, termios, or the port does not exist,
@@ -466,6 +459,18 @@ static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
 		uport->status &= ~UPSTAT_DCD_ENABLE;
 	else
 		uport->status |= UPSTAT_DCD_ENABLE;
+
+	/* reset sw-assisted CTS flow control based on (possibly) new mode */
+	hw_stopped = uport->hw_stopped;
+	uport->hw_stopped = uart_softcts_mode(uport) &&
+				!(uport->ops->get_mctrl(uport) & TIOCM_CTS);
+	if (uport->hw_stopped) {
+		if (!hw_stopped)
+			uport->ops->stop_tx(uport);
+	} else {
+		if (hw_stopped)
+			__uart_start(tty);
+	}
 	spin_unlock_irq(&uport->lock);
 }
 
@@ -619,22 +624,22 @@ static void uart_throttle(struct tty_struct *tty)
 {
 	struct uart_state *state = tty->driver_data;
 	struct uart_port *port = state->uart_port;
-	upf_t mask = 0;
+	upstat_t mask = 0;
 
 	if (I_IXOFF(tty))
-		mask |= UPF_SOFT_FLOW;
+		mask |= UPSTAT_AUTOXOFF;
 	if (tty->termios.c_cflag & CRTSCTS)
-		mask |= UPF_HARD_FLOW;
+		mask |= UPSTAT_AUTORTS;
 
-	if (port->flags & mask) {
+	if (port->status & mask) {
 		port->ops->throttle(port);
-		mask &= ~port->flags;
+		mask &= ~port->status;
 	}
 
-	if (mask & UPF_SOFT_FLOW)
+	if (mask & UPSTAT_AUTOXOFF)
 		uart_send_xchar(tty, STOP_CHAR(tty));
 
-	if (mask & UPF_HARD_FLOW)
+	if (mask & UPSTAT_AUTORTS)
 		uart_clear_mctrl(port, TIOCM_RTS);
 }
 
@@ -642,22 +647,22 @@ static void uart_unthrottle(struct tty_struct *tty)
 {
 	struct uart_state *state = tty->driver_data;
 	struct uart_port *port = state->uart_port;
-	upf_t mask = 0;
+	upstat_t mask = 0;
 
 	if (I_IXOFF(tty))
-		mask |= UPF_SOFT_FLOW;
+		mask |= UPSTAT_AUTOXOFF;
 	if (tty->termios.c_cflag & CRTSCTS)
-		mask |= UPF_HARD_FLOW;
+		mask |= UPSTAT_AUTORTS;
 
-	if (port->flags & mask) {
+	if (port->status & mask) {
 		port->ops->unthrottle(port);
-		mask &= ~port->flags;
+		mask &= ~port->status;
 	}
 
-	if (mask & UPF_SOFT_FLOW)
+	if (mask & UPSTAT_AUTOXOFF)
 		uart_send_xchar(tty, START_CHAR(tty));
 
-	if (mask & UPF_HARD_FLOW)
+	if (mask & UPSTAT_AUTORTS)
 		uart_set_mctrl(port, TIOCM_RTS);
 }
 
@@ -1351,30 +1356,6 @@ static void uart_set_termios(struct tty_struct *tty,
 			mask |= TIOCM_RTS;
 		uart_set_mctrl(uport, mask);
 	}
-
-	/*
-	 * If the port is doing h/w assisted flow control, do nothing.
-	 * We assume that port->hw_stopped has never been set.
-	 */
-	if (uport->flags & UPF_HARD_FLOW)
-		return;
-
-	/* Handle turning off CRTSCTS */
-	if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) {
-		spin_lock_irq(&uport->lock);
-		uport->hw_stopped = 0;
-		__uart_start(tty);
-		spin_unlock_irq(&uport->lock);
-	}
-	/* Handle turning on CRTSCTS */
-	else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
-		spin_lock_irq(&uport->lock);
-		if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) {
-			uport->hw_stopped = 1;
-			uport->ops->stop_tx(uport);
-		}
-		spin_unlock_irq(&uport->lock);
-	}
 }
 
 /*
@@ -2855,7 +2836,7 @@ void uart_handle_cts_change(struct uart_port *uport, unsigned int status)
 
 	uport->icount.cts++;
 
-	if (uart_cts_enabled(uport)) {
+	if (uart_softcts_mode(uport)) {
 		if (uport->hw_stopped) {
 			if (status) {
 				uport->hw_stopped = 0;
@@ -2868,6 +2849,7 @@ void uart_handle_cts_change(struct uart_port *uport, unsigned int status)
 				uport->ops->stop_tx(uport);
 			}
 		}
+
 	}
 }
 EXPORT_SYMBOL_GPL(uart_handle_cts_change);
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index a0c7033d5f91..baf3e1d08416 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -191,8 +191,10 @@ struct uart_port {
 #define UPF_NO_TXEN_TEST	((__force upf_t) (1 << 15))
 #define UPF_MAGIC_MULTIPLIER	((__force upf_t) ASYNC_MAGIC_MULTIPLIER /* 16 */ )
 
-/* Port has hardware-assisted h/w flow control (iow, auto-RTS *not* auto-CTS) */
-#define UPF_HARD_FLOW		((__force upf_t) (1 << 21))
+/* Port has hardware-assisted h/w flow control */
+#define UPF_AUTO_CTS		((__force upf_t) (1 << 20))
+#define UPF_AUTO_RTS		((__force upf_t) (1 << 21))
+#define UPF_HARD_FLOW		((__force upf_t) (UPF_AUTO_CTS | UPF_AUTO_RTS))
 /* Port has hardware-assisted s/w flow control */
 #define UPF_SOFT_FLOW		((__force upf_t) (1 << 22))
 #define UPF_CONS_FLOW		((__force upf_t) (1 << 23))
@@ -214,11 +216,17 @@ struct uart_port {
 #error Change mask not equivalent to userspace-visible bit defines
 #endif
 
-	/* status must be updated while holding port lock */
+	/*
+	 * Must hold termios_rwsem, port mutex and port lock to change;
+	 * can hold any one lock to read.
+	 */
 	upstat_t		status;
 
 #define UPSTAT_CTS_ENABLE	((__force upstat_t) (1 << 0))
 #define UPSTAT_DCD_ENABLE	((__force upstat_t) (1 << 1))
+#define UPSTAT_AUTORTS		((__force upstat_t) (1 << 2))
+#define UPSTAT_AUTOCTS		((__force upstat_t) (1 << 3))
+#define UPSTAT_AUTOXOFF		((__force upstat_t) (1 << 4))
 
 	int			hw_stopped;		/* sw-assisted CTS flow state */
 	unsigned int		mctrl;			/* current modem ctrl settings */
@@ -392,6 +400,13 @@ static inline bool uart_cts_enabled(struct uart_port *uport)
 	return !!(uport->status & UPSTAT_CTS_ENABLE);
 }
 
+static inline bool uart_softcts_mode(struct uart_port *uport)
+{
+	upstat_t mask = UPSTAT_CTS_ENABLE | UPSTAT_AUTOCTS;
+
+	return ((uport->status & mask) == UPSTAT_CTS_ENABLE);
+}
+
 /*
  * The following are helper functions for the low level drivers.
  */
-- 
cgit v1.2.3-59-g8ed1b


From 9719acce37803d179fc94884c8d50b883fc8186e Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Sun, 25 Jan 2015 14:44:52 -0500
Subject: serial: 8250_omap: Use UPSTAT_AUTORTS for RTS handling

Commit 88838d3112702 ("serial: omap_8250: Fix RTS handling") fixed
RTS pin control when in autoRTS mode.

New support added in "serial: core: Rework hw-assisted flow control support"
enables a much simpler approach; rather than masking out autoRTS
whenever writing the EFR register, use the UPSTAT_* mode to determine if
autoRTS should be enabled when raising RTS (in omap8250_set_mctrl()).

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_omap.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 6e4ff7148ead..fe6d2e51da09 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -120,10 +120,11 @@ static void omap8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	 */
 	lcr = serial_in(up, UART_LCR);
 	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
-	if (mctrl & TIOCM_RTS)
-		serial_out(up, UART_EFR, priv->efr);
+	if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))
+		priv->efr |= UART_EFR_RTS;
 	else
-		serial_out(up, UART_EFR, priv->efr & ~UART_EFR_RTS);
+		priv->efr &= ~UART_EFR_RTS;
+	serial_out(up, UART_EFR, priv->efr);
 	serial_out(up, UART_LCR, lcr);
 }
 
@@ -272,10 +273,7 @@ static void omap8250_restore_regs(struct uart_8250_port *up)
 	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 	serial_dl_write(up, priv->quot);
 
-	if (up->port.mctrl & TIOCM_RTS)
-		serial_out(up, UART_EFR, priv->efr);
-	else
-		serial_out(up, UART_EFR, priv->efr & ~UART_EFR_RTS);
+	serial_out(up, UART_EFR, priv->efr);
 
 	/* Configure flow control */
 	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
@@ -424,9 +422,9 @@ static void omap_8250_set_termios(struct uart_port *port,
 	up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF);
 
 	if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
-		/* Enable AUTORTS and AUTOCTS */
+		/* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */
 		up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
-		priv->efr |= UART_EFR_CTS | UART_EFR_RTS;
+		priv->efr |= UART_EFR_CTS;
 	} else	if (up->port.flags & UPF_SOFT_FLOW) {
 		/*
 		 * IXON Flag:
-- 
cgit v1.2.3-59-g8ed1b


From 348f9bb31c56909f9098a598b6ecdc94a560816e Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Sun, 25 Jan 2015 14:44:53 -0500
Subject: serial: omap: Fix RTS handling

The OMAP UART ignores MCR[1] (ie., RTS) when in autoRTS mode. This
makes it impossible for either the serial core or userspace to
manually flow control the sender.

Disable autoRTS mode when RTS is lowered and restore the previous
mode when RTS is raised.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/omap-serial.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 6129fe515932..10256fa04b40 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -681,7 +681,7 @@ static unsigned int serial_omap_get_mctrl(struct uart_port *port)
 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
 	struct uart_omap_port *up = to_uart_omap_port(port);
-	unsigned char mcr = 0, old_mcr;
+	unsigned char mcr = 0, old_mcr, lcr;
 
 	dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line);
 	if (mctrl & TIOCM_RTS)
@@ -701,6 +701,17 @@ static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
 		     UART_MCR_DTR | UART_MCR_RTS);
 	up->mcr = old_mcr | mcr;
 	serial_out(up, UART_MCR, up->mcr);
+
+	/* Turn off autoRTS if RTS is lowered; restore autoRTS if RTS raised */
+	lcr = serial_in(up, UART_LCR);
+	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+	if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))
+		up->efr |= UART_EFR_RTS;
+	else
+		up->efr &= UART_EFR_RTS;
+	serial_out(up, UART_EFR, up->efr);
+	serial_out(up, UART_LCR, lcr);
+
 	pm_runtime_mark_last_busy(up->dev);
 	pm_runtime_put_autosuspend(up->dev);
 }
@@ -756,8 +767,6 @@ static int serial_omap_startup(struct uart_port *port)
 	 * (they will be reenabled in set_termios())
 	 */
 	serial_omap_clear_fifos(up);
-	/* For Hardware flow control */
-	serial_out(up, UART_MCR, UART_MCR_RTS);
 
 	/*
 	 * Clear the interrupt registers.
@@ -1056,12 +1065,9 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 	up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF);
 
 	if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
-		/* Enable AUTORTS and AUTOCTS */
+		/* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */
 		up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
-		up->efr |= UART_EFR_CTS | UART_EFR_RTS;
-
-		/* Ensure MCR RTS is asserted */
-		up->mcr |= UART_MCR_RTS;
+		up->efr |= UART_EFR_CTS;
 	} else {
 		/* Disable AUTORTS and AUTOCTS */
 		up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS);
-- 
cgit v1.2.3-59-g8ed1b


From 632f32e2107d37598e3f6816dcf00c7cab4081ca Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Sun, 25 Jan 2015 14:44:54 -0500
Subject: tty: Remove external interface for tty_set_termios()

tty_set_termios() is an internal helper intended for file scope use.

UART drivers which are capable of driving the RTS pin must
properly handle the tiocmset() method, regardless of termios settings.
A failure to do so is a UART driver bug and should be fixed there.
Do not use this interface to workaround UART driver bugs.

Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: <linux-bluetooth@vger.kernel.org>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/bluetooth/hci_ath.c | 15 ++-------------
 drivers/tty/tty_ioctl.c     |  3 +--
 include/linux/tty.h         |  1 -
 3 files changed, 3 insertions(+), 16 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/bluetooth/hci_ath.c b/drivers/bluetooth/hci_ath.c
index 2ff6dfd2d3f0..9c4dcf4c62ea 100644
--- a/drivers/bluetooth/hci_ath.c
+++ b/drivers/bluetooth/hci_ath.c
@@ -51,33 +51,22 @@ struct ath_struct {
 
 static int ath_wakeup_ar3k(struct tty_struct *tty)
 {
-	struct ktermios ktermios;
 	int status = tty->driver->ops->tiocmget(tty);
 
 	if (status & TIOCM_CTS)
 		return status;
 
-	/* Disable Automatic RTSCTS */
-	ktermios = tty->termios;
-	ktermios.c_cflag &= ~CRTSCTS;
-	tty_set_termios(tty, &ktermios);
-
 	/* Clear RTS first */
-	status = tty->driver->ops->tiocmget(tty);
+	tty->driver->ops->tiocmget(tty);
 	tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
 	mdelay(20);
 
 	/* Set RTS, wake up board */
-	status = tty->driver->ops->tiocmget(tty);
+	tty->driver->ops->tiocmget(tty);
 	tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
 	mdelay(20);
 
 	status = tty->driver->ops->tiocmget(tty);
-
-	/* Enable Automatic RTSCTS */
-	ktermios.c_cflag |= CRTSCTS;
-	status = tty_set_termios(tty, &ktermios);
-
 	return status;
 }
 
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
index 1787fa4d9448..a5cf253b2544 100644
--- a/drivers/tty/tty_ioctl.c
+++ b/drivers/tty/tty_ioctl.c
@@ -530,7 +530,7 @@ EXPORT_SYMBOL(tty_termios_hw_change);
  *	Locking: termios_rwsem
  */
 
-int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
+static int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
 {
 	struct ktermios old_termios;
 	struct tty_ldisc *ld;
@@ -563,7 +563,6 @@ int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
 	up_write(&tty->termios_rwsem);
 	return 0;
 }
-EXPORT_SYMBOL_GPL(tty_set_termios);
 
 /**
  *	set_termios		-	set termios values for a tty
diff --git a/include/linux/tty.h b/include/linux/tty.h
index fe5623c9af71..358a337af598 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -491,7 +491,6 @@ static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
 
 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
-extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
 
 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 extern void tty_ldisc_deref(struct tty_ldisc *);
-- 
cgit v1.2.3-59-g8ed1b


From ba019a3e2ad53dcc56f3c0b15e1061b77129b63d Mon Sep 17 00:00:00 2001
From: Robert Baldyga <r.baldyga@samsung.com>
Date: Wed, 28 Jan 2015 14:44:23 +0100
Subject: serial: samsung: remove redundant interrupt enabling

Function s3c24xx_serial_start_tx_pio() enables interrupts if needed,
so we don't have to (or even we shouldn't) enable them before.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/samsung.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index a6bef8dcdc3c..236abae97613 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -358,15 +358,8 @@ void s3c24xx_serial_start_tx(struct uart_port *port)
 			s3c24xx_serial_rx_disable(port);
 
 		tx_enabled(port) = 1;
-		if (!ourport->dma || !ourport->dma->tx_chan) {
-			if (s3c24xx_serial_has_interrupt_mask(port))
-				__clear_bit(S3C64XX_UINTM_TXD,
-						portaddrl(port, S3C64XX_UINTM));
-			else
-				enable_irq(ourport->tx_irq);
-
+		if (!ourport->dma || !ourport->dma->tx_chan)
 			s3c24xx_serial_start_tx_pio(ourport);
-		}
 	}
 
 	if (ourport->dma && ourport->dma->tx_chan) {
-- 
cgit v1.2.3-59-g8ed1b


From b7396a38fb28db4ebbbf35da1057eb5206b4ad6c Mon Sep 17 00:00:00 2001
From: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
Date: Wed, 28 Jan 2015 19:08:44 +0800
Subject: tty/serial: Add Spreadtrum sc9836-uart driver support

Add a full sc9836-uart driver for SC9836 SoC which is based on the
spreadtrum sharkl64 platform.
This driver also support earlycon.

Originally-by: Lanqing Liu <lanqing.liu@spreadtrum.com>
Signed-off-by: Orson Zhai <orson.zhai@spreadtrum.com>
Signed-off-by: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/Kconfig       |  18 +
 drivers/tty/serial/Makefile      |   1 +
 drivers/tty/serial/sprd_serial.c | 793 +++++++++++++++++++++++++++++++++++++++
 include/uapi/linux/serial_core.h |   3 +
 4 files changed, 815 insertions(+)
 create mode 100644 drivers/tty/serial/sprd_serial.c

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index c63317e87c33..ddcc0a4c659c 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1583,6 +1583,24 @@ config SERIAL_MEN_Z135
 	  This driver can also be build as a module. If so, the module will be called
 	  men_z135_uart.ko
 
+config SERIAL_SPRD
+	tristate "Support for Spreadtrum serial"
+	depends on ARCH_SPRD
+	select SERIAL_CORE
+	help
+	  This enables the driver for the Spreadtrum's serial.
+
+config SERIAL_SPRD_CONSOLE
+	bool "Spreadtrum UART console support"
+	depends on SERIAL_SPRD=y
+	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
+	help
+	  Support for early debug console using Spreadtrum's serial. This enables
+	  the console before standard serial driver is probed. This is enabled
+	  with "earlycon" on the kernel command line. The console is
+	  enabled when early_param is processed.
+
 endmenu
 
 config SERIAL_MCTRL_GPIO
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index a1c1085ef75c..431879003ccd 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -93,6 +93,7 @@ obj-$(CONFIG_SERIAL_RP2)	+= rp2.o
 obj-$(CONFIG_SERIAL_FSL_LPUART)	+= fsl_lpuart.o
 obj-$(CONFIG_SERIAL_CONEXANT_DIGICOLOR)	+= digicolor-usart.o
 obj-$(CONFIG_SERIAL_MEN_Z135)	+= men_z135_uart.o
+obj-$(CONFIG_SERIAL_SPRD) += sprd_serial.o
 
 # GPIOLIB helpers for modem control lines
 obj-$(CONFIG_SERIAL_MCTRL_GPIO)	+= serial_mctrl_gpio.o
diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
new file mode 100644
index 000000000000..594b63331ef4
--- /dev/null
+++ b/drivers/tty/serial/sprd_serial.c
@@ -0,0 +1,793 @@
+/*
+ * Copyright (C) 2012-2015 Spreadtrum Communications Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#if defined(CONFIG_SERIAL_SPRD_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/clk.h>
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+
+/* device name */
+#define UART_NR_MAX		8
+#define SPRD_TTY_NAME		"ttyS"
+#define SPRD_FIFO_SIZE		128
+#define SPRD_DEF_RATE		26000000
+#define SPRD_BAUD_IO_LIMIT	3000000
+#define SPRD_TIMEOUT		256
+
+/* the offset of serial registers and BITs for them */
+/* data registers */
+#define SPRD_TXD		0x0000
+#define SPRD_RXD		0x0004
+
+/* line status register and its BITs  */
+#define SPRD_LSR		0x0008
+#define SPRD_LSR_OE		BIT(4)
+#define SPRD_LSR_FE		BIT(3)
+#define SPRD_LSR_PE		BIT(2)
+#define SPRD_LSR_BI		BIT(7)
+#define SPRD_LSR_TX_OVER	BIT(15)
+
+/* data number in TX and RX fifo */
+#define SPRD_STS1		0x000C
+
+/* interrupt enable register and its BITs */
+#define SPRD_IEN		0x0010
+#define SPRD_IEN_RX_FULL	BIT(0)
+#define SPRD_IEN_TX_EMPTY	BIT(1)
+#define SPRD_IEN_BREAK_DETECT	BIT(7)
+#define SPRD_IEN_TIMEOUT	BIT(13)
+
+/* interrupt clear register */
+#define SPRD_ICLR		0x0014
+
+/* line control register */
+#define SPRD_LCR		0x0018
+#define SPRD_LCR_STOP_1BIT	0x10
+#define SPRD_LCR_STOP_2BIT	0x30
+#define SPRD_LCR_DATA_LEN	(BIT(2) | BIT(3))
+#define SPRD_LCR_DATA_LEN5	0x0
+#define SPRD_LCR_DATA_LEN6	0x4
+#define SPRD_LCR_DATA_LEN7	0x8
+#define SPRD_LCR_DATA_LEN8	0xc
+#define SPRD_LCR_PARITY	(BIT(0) | BIT(1))
+#define SPRD_LCR_PARITY_EN	0x2
+#define SPRD_LCR_EVEN_PAR	0x0
+#define SPRD_LCR_ODD_PAR	0x1
+
+/* control register 1 */
+#define SPRD_CTL1			0x001C
+#define RX_HW_FLOW_CTL_THLD	BIT(6)
+#define RX_HW_FLOW_CTL_EN	BIT(7)
+#define TX_HW_FLOW_CTL_EN	BIT(8)
+#define RX_TOUT_THLD_DEF	0x3E00
+#define RX_HFC_THLD_DEF	0x40
+
+/* fifo threshold register */
+#define SPRD_CTL2		0x0020
+#define THLD_TX_EMPTY	0x40
+#define THLD_RX_FULL	0x40
+
+/* config baud rate register */
+#define SPRD_CLKD0		0x0024
+#define SPRD_CLKD1		0x0028
+
+/* interrupt mask status register */
+#define SPRD_IMSR			0x002C
+#define SPRD_IMSR_RX_FIFO_FULL		BIT(0)
+#define SPRD_IMSR_TX_FIFO_EMPTY	BIT(1)
+#define SPRD_IMSR_BREAK_DETECT		BIT(7)
+#define SPRD_IMSR_TIMEOUT		BIT(13)
+
+struct reg_backup {
+	u32 ien;
+	u32 ctrl0;
+	u32 ctrl1;
+	u32 ctrl2;
+	u32 clkd0;
+	u32 clkd1;
+	u32 dspwait;
+};
+
+struct sprd_uart_port {
+	struct uart_port port;
+	struct reg_backup reg_bak;
+	char name[16];
+};
+
+static struct sprd_uart_port *sprd_port[UART_NR_MAX];
+static int sprd_ports_num;
+
+static inline unsigned int serial_in(struct uart_port *port, int offset)
+{
+	return readl_relaxed(port->membase + offset);
+}
+
+static inline void serial_out(struct uart_port *port, int offset, int value)
+{
+	writel_relaxed(value, port->membase + offset);
+}
+
+static unsigned int sprd_tx_empty(struct uart_port *port)
+{
+	if (serial_in(port, SPRD_STS1) & 0xff00)
+		return 0;
+	else
+		return TIOCSER_TEMT;
+}
+
+static unsigned int sprd_get_mctrl(struct uart_port *port)
+{
+	return TIOCM_DSR | TIOCM_CTS;
+}
+
+static void sprd_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	/* nothing to do */
+}
+
+static void sprd_stop_tx(struct uart_port *port)
+{
+	unsigned int ien, iclr;
+
+	iclr = serial_in(port, SPRD_ICLR);
+	ien = serial_in(port, SPRD_IEN);
+
+	iclr |= SPRD_IEN_TX_EMPTY;
+	ien &= ~SPRD_IEN_TX_EMPTY;
+
+	serial_out(port, SPRD_ICLR, iclr);
+	serial_out(port, SPRD_IEN, ien);
+}
+
+static void sprd_start_tx(struct uart_port *port)
+{
+	unsigned int ien;
+
+	ien = serial_in(port, SPRD_IEN);
+	if (!(ien & SPRD_IEN_TX_EMPTY)) {
+		ien |= SPRD_IEN_TX_EMPTY;
+		serial_out(port, SPRD_IEN, ien);
+	}
+}
+
+static void sprd_stop_rx(struct uart_port *port)
+{
+	unsigned int ien, iclr;
+
+	iclr = serial_in(port, SPRD_ICLR);
+	ien = serial_in(port, SPRD_IEN);
+
+	ien &= ~(SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT);
+	iclr |= SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT;
+
+	serial_out(port, SPRD_IEN, ien);
+	serial_out(port, SPRD_ICLR, iclr);
+}
+
+/* The Sprd serial does not support this function. */
+static void sprd_break_ctl(struct uart_port *port, int break_state)
+{
+	/* nothing to do */
+}
+
+static int handle_lsr_errors(struct uart_port *port,
+			     unsigned int *flag,
+			     unsigned int *lsr)
+{
+	int ret = 0;
+
+	/* statistics */
+	if (*lsr & SPRD_LSR_BI) {
+		*lsr &= ~(SPRD_LSR_FE | SPRD_LSR_PE);
+		port->icount.brk++;
+		ret = uart_handle_break(port);
+		if (ret)
+			return ret;
+	} else if (*lsr & SPRD_LSR_PE)
+		port->icount.parity++;
+	else if (*lsr & SPRD_LSR_FE)
+		port->icount.frame++;
+	if (*lsr & SPRD_LSR_OE)
+		port->icount.overrun++;
+
+	/* mask off conditions which should be ignored */
+	*lsr &= port->read_status_mask;
+	if (*lsr & SPRD_LSR_BI)
+		*flag = TTY_BREAK;
+	else if (*lsr & SPRD_LSR_PE)
+		*flag = TTY_PARITY;
+	else if (*lsr & SPRD_LSR_FE)
+		*flag = TTY_FRAME;
+
+	return ret;
+}
+
+static inline void sprd_rx(struct uart_port *port)
+{
+	struct tty_port *tty = &port->state->port;
+	unsigned int ch, flag, lsr, max_count = SPRD_TIMEOUT;
+
+	while ((serial_in(port, SPRD_STS1) & 0x00ff) && max_count--) {
+		lsr = serial_in(port, SPRD_LSR);
+		ch = serial_in(port, SPRD_RXD);
+		flag = TTY_NORMAL;
+		port->icount.rx++;
+
+		if (lsr & (SPRD_LSR_BI | SPRD_LSR_PE |
+			SPRD_LSR_FE | SPRD_LSR_OE))
+			if (handle_lsr_errors(port, &lsr, &flag))
+				continue;
+		if (uart_handle_sysrq_char(port, ch))
+			continue;
+
+		uart_insert_char(port, lsr, SPRD_LSR_OE, ch, flag);
+	}
+
+	tty_flip_buffer_push(tty);
+}
+
+static inline void sprd_tx(struct uart_port *port)
+{
+	struct circ_buf *xmit = &port->state->xmit;
+	int count;
+
+	if (port->x_char) {
+		serial_out(port, SPRD_TXD, port->x_char);
+		port->icount.tx++;
+		port->x_char = 0;
+		return;
+	}
+
+	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+		sprd_stop_tx(port);
+		return;
+	}
+
+	count = THLD_TX_EMPTY;
+	do {
+		serial_out(port, SPRD_TXD, xmit->buf[xmit->tail]);
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		port->icount.tx++;
+		if (uart_circ_empty(xmit))
+			break;
+	} while (--count > 0);
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
+	if (uart_circ_empty(xmit))
+		sprd_stop_tx(port);
+}
+
+/* this handles the interrupt from one port */
+static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
+{
+	struct uart_port *port = dev_id;
+	unsigned int ims;
+
+	spin_lock(&port->lock);
+
+	ims = serial_in(port, SPRD_IMSR);
+
+	if (!ims)
+		return IRQ_NONE;
+
+	serial_out(port, SPRD_ICLR, ~0);
+
+	if (ims & (SPRD_IMSR_RX_FIFO_FULL |
+		SPRD_IMSR_BREAK_DETECT | SPRD_IMSR_TIMEOUT))
+		sprd_rx(port);
+
+	if (ims & SPRD_IMSR_TX_FIFO_EMPTY)
+		sprd_tx(port);
+
+	spin_unlock(&port->lock);
+
+	return IRQ_HANDLED;
+}
+
+static int sprd_startup(struct uart_port *port)
+{
+	int ret = 0;
+	unsigned int ien, fc;
+	unsigned int timeout;
+	struct sprd_uart_port *sp;
+	unsigned long flags;
+
+	serial_out(port, SPRD_CTL2, ((THLD_TX_EMPTY << 8) | THLD_RX_FULL));
+
+	/* clear rx fifo */
+	timeout = SPRD_TIMEOUT;
+	while (timeout-- && serial_in(port, SPRD_STS1) & 0x00ff)
+		serial_in(port, SPRD_RXD);
+
+	/* clear tx fifo */
+	timeout = SPRD_TIMEOUT;
+	while (timeout-- && serial_in(port, SPRD_STS1) & 0xff00)
+		cpu_relax();
+
+	/* clear interrupt */
+	serial_out(port, SPRD_IEN, 0);
+	serial_out(port, SPRD_ICLR, ~0);
+
+	/* allocate irq */
+	sp = container_of(port, struct sprd_uart_port, port);
+	snprintf(sp->name, sizeof(sp->name), "sprd_serial%d", port->line);
+	ret = devm_request_irq(port->dev, port->irq, sprd_handle_irq,
+				IRQF_SHARED, sp->name, port);
+	if (ret) {
+		dev_err(port->dev, "fail to request serial irq %d, ret=%d\n",
+			port->irq, ret);
+		return ret;
+	}
+	fc = serial_in(port, SPRD_CTL1);
+	fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF;
+	serial_out(port, SPRD_CTL1, fc);
+
+	/* enable interrupt */
+	spin_lock_irqsave(&port->lock, flags);
+	ien = serial_in(port, SPRD_IEN);
+	ien |= SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT | SPRD_IEN_TIMEOUT;
+	serial_out(port, SPRD_IEN, ien);
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	return 0;
+}
+
+static void sprd_shutdown(struct uart_port *port)
+{
+	serial_out(port, SPRD_IEN, 0);
+	serial_out(port, SPRD_ICLR, ~0);
+	devm_free_irq(port->dev, port->irq, port);
+}
+
+static void sprd_set_termios(struct uart_port *port,
+				    struct ktermios *termios,
+				    struct ktermios *old)
+{
+	unsigned int baud, quot;
+	unsigned int lcr = 0, fc;
+	unsigned long flags;
+
+	/* ask the core to calculate the divisor for us */
+	baud = uart_get_baud_rate(port, termios, old, 0, SPRD_BAUD_IO_LIMIT);
+
+	quot = (unsigned int)((port->uartclk + baud / 2) / baud);
+
+	/* set data length */
+	switch (termios->c_cflag & CSIZE) {
+	case CS5:
+		lcr |= SPRD_LCR_DATA_LEN5;
+		break;
+	case CS6:
+		lcr |= SPRD_LCR_DATA_LEN6;
+		break;
+	case CS7:
+		lcr |= SPRD_LCR_DATA_LEN7;
+		break;
+	case CS8:
+	default:
+		lcr |= SPRD_LCR_DATA_LEN8;
+		break;
+	}
+
+	/* calculate stop bits */
+	lcr &= ~(SPRD_LCR_STOP_1BIT | SPRD_LCR_STOP_2BIT);
+	if (termios->c_cflag & CSTOPB)
+		lcr |= SPRD_LCR_STOP_2BIT;
+	else
+		lcr |= SPRD_LCR_STOP_1BIT;
+
+	/* calculate parity */
+	lcr &= ~SPRD_LCR_PARITY;
+	termios->c_cflag &= ~CMSPAR;	/* no support mark/space */
+	if (termios->c_cflag & PARENB) {
+		lcr |= SPRD_LCR_PARITY_EN;
+		if (termios->c_cflag & PARODD)
+			lcr |= SPRD_LCR_ODD_PAR;
+		else
+			lcr |= SPRD_LCR_EVEN_PAR;
+	}
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	/* update the per-port timeout */
+	uart_update_timeout(port, termios->c_cflag, baud);
+
+	port->read_status_mask = SPRD_LSR_OE;
+	if (termios->c_iflag & INPCK)
+		port->read_status_mask |= SPRD_LSR_FE | SPRD_LSR_PE;
+	if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
+		port->read_status_mask |= SPRD_LSR_BI;
+
+	/* characters to ignore */
+	port->ignore_status_mask = 0;
+	if (termios->c_iflag & IGNPAR)
+		port->ignore_status_mask |= SPRD_LSR_PE | SPRD_LSR_FE;
+	if (termios->c_iflag & IGNBRK) {
+		port->ignore_status_mask |= SPRD_LSR_BI;
+		/*
+		 * If we're ignoring parity and break indicators,
+		 * ignore overruns too (for real raw support).
+		 */
+		if (termios->c_iflag & IGNPAR)
+			port->ignore_status_mask |= SPRD_LSR_OE;
+	}
+
+	/* flow control */
+	fc = serial_in(port, SPRD_CTL1);
+	fc &= ~(RX_HW_FLOW_CTL_THLD | RX_HW_FLOW_CTL_EN | TX_HW_FLOW_CTL_EN);
+	if (termios->c_cflag & CRTSCTS) {
+		fc |= RX_HW_FLOW_CTL_THLD;
+		fc |= RX_HW_FLOW_CTL_EN;
+		fc |= TX_HW_FLOW_CTL_EN;
+	}
+
+	/* clock divider bit0~bit15 */
+	serial_out(port, SPRD_CLKD0, quot & 0xffff);
+
+	/* clock divider bit16~bit20 */
+	serial_out(port, SPRD_CLKD1, (quot & 0x1f0000) >> 16);
+	serial_out(port, SPRD_LCR, lcr);
+	fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF;
+	serial_out(port, SPRD_CTL1, fc);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	/* Don't rewrite B0 */
+	if (tty_termios_baud_rate(termios))
+		tty_termios_encode_baud_rate(termios, baud, baud);
+}
+
+static const char *sprd_type(struct uart_port *port)
+{
+	return "SPX";
+}
+
+static void sprd_release_port(struct uart_port *port)
+{
+	/* nothing to do */
+}
+
+static int sprd_request_port(struct uart_port *port)
+{
+	return 0;
+}
+
+static void sprd_config_port(struct uart_port *port, int flags)
+{
+	if (flags & UART_CONFIG_TYPE)
+		port->type = PORT_SPRD;
+}
+
+static int sprd_verify_port(struct uart_port *port,
+				   struct serial_struct *ser)
+{
+	if (ser->type != PORT_SPRD)
+		return -EINVAL;
+	if (port->irq != ser->irq)
+		return -EINVAL;
+	return 0;
+}
+
+static struct uart_ops serial_sprd_ops = {
+	.tx_empty = sprd_tx_empty,
+	.get_mctrl = sprd_get_mctrl,
+	.set_mctrl = sprd_set_mctrl,
+	.stop_tx = sprd_stop_tx,
+	.start_tx = sprd_start_tx,
+	.stop_rx = sprd_stop_rx,
+	.break_ctl = sprd_break_ctl,
+	.startup = sprd_startup,
+	.shutdown = sprd_shutdown,
+	.set_termios = sprd_set_termios,
+	.type = sprd_type,
+	.release_port = sprd_release_port,
+	.request_port = sprd_request_port,
+	.config_port = sprd_config_port,
+	.verify_port = sprd_verify_port,
+};
+
+#ifdef CONFIG_SERIAL_SPRD_CONSOLE
+static inline void wait_for_xmitr(struct uart_port *port)
+{
+	unsigned int status, tmout = 10000;
+
+	/* wait up to 10ms for the character(s) to be sent */
+	do {
+		status = serial_in(port, SPRD_STS1);
+		if (--tmout == 0)
+			break;
+		udelay(1);
+	} while (status & 0xff00);
+}
+
+static void sprd_console_putchar(struct uart_port *port, int ch)
+{
+	wait_for_xmitr(port);
+	serial_out(port, SPRD_TXD, ch);
+}
+
+static void sprd_console_write(struct console *co, const char *s,
+				      unsigned int count)
+{
+	struct uart_port *port = &sprd_port[co->index]->port;
+	int locked = 1;
+	unsigned long flags;
+
+	if (port->sysrq)
+		locked = 0;
+	else if (oops_in_progress)
+		locked = spin_trylock_irqsave(&port->lock, flags);
+	else
+		spin_lock_irqsave(&port->lock, flags);
+
+	uart_console_write(port, s, count, sprd_console_putchar);
+
+	/* wait for transmitter to become empty */
+	wait_for_xmitr(port);
+
+	if (locked)
+		spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static int __init sprd_console_setup(struct console *co, char *options)
+{
+	struct uart_port *port;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+
+	if (co->index >= UART_NR_MAX || co->index < 0)
+		co->index = 0;
+
+	port = &sprd_port[co->index]->port;
+	if (port == NULL) {
+		pr_info("serial port %d not yet initialized\n", co->index);
+		return -ENODEV;
+	}
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+	return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver sprd_uart_driver;
+static struct console sprd_console = {
+	.name = SPRD_TTY_NAME,
+	.write = sprd_console_write,
+	.device = uart_console_device,
+	.setup = sprd_console_setup,
+	.flags = CON_PRINTBUFFER,
+	.index = -1,
+	.data = &sprd_uart_driver,
+};
+
+#define SPRD_CONSOLE	(&sprd_console)
+
+/* Support for earlycon */
+static void sprd_putc(struct uart_port *port, int c)
+{
+	unsigned int timeout = SPRD_TIMEOUT;
+
+	while (timeout-- &&
+		   !(readl(port->membase + SPRD_LSR) & SPRD_LSR_TX_OVER))
+		cpu_relax();
+
+	writeb(c, port->membase + SPRD_TXD);
+}
+
+static void sprd_early_write(struct console *con, const char *s,
+				    unsigned n)
+{
+	struct earlycon_device *dev = con->data;
+
+	uart_console_write(&dev->port, s, n, sprd_putc);
+}
+
+static int __init sprd_early_console_setup(
+				struct earlycon_device *device,
+				const char *opt)
+{
+	if (!device->port.membase)
+		return -ENODEV;
+
+	device->con->write = sprd_early_write;
+	return 0;
+}
+
+EARLYCON_DECLARE(sprd_serial, sprd_early_console_setup);
+OF_EARLYCON_DECLARE(sprd_serial, "sprd,sc9836-uart",
+		    sprd_early_console_setup);
+
+#else /* !CONFIG_SERIAL_SPRD_CONSOLE */
+#define SPRD_CONSOLE		NULL
+#endif
+
+static struct uart_driver sprd_uart_driver = {
+	.owner = THIS_MODULE,
+	.driver_name = "sprd_serial",
+	.dev_name = SPRD_TTY_NAME,
+	.major = 0,
+	.minor = 0,
+	.nr = UART_NR_MAX,
+	.cons = SPRD_CONSOLE,
+};
+
+static int sprd_probe_dt_alias(int index, struct device *dev)
+{
+	struct device_node *np;
+	int ret = index;
+
+	if (!IS_ENABLED(CONFIG_OF))
+		return ret;
+
+	np = dev->of_node;
+	if (!np)
+		return ret;
+
+	ret = of_alias_get_id(np, "serial");
+	if (IS_ERR_VALUE(ret))
+		ret = index;
+	else if (ret >= ARRAY_SIZE(sprd_port) || sprd_port[ret] != NULL) {
+		dev_warn(dev, "requested serial port %d not available.\n", ret);
+		ret = index;
+	}
+
+	return ret;
+}
+
+static int sprd_remove(struct platform_device *dev)
+{
+	struct sprd_uart_port *sup = platform_get_drvdata(dev);
+
+	if (sup) {
+		uart_remove_one_port(&sprd_uart_driver, &sup->port);
+		sprd_port[sup->port.line] = NULL;
+		sprd_ports_num--;
+	}
+
+	if (!sprd_ports_num)
+		uart_unregister_driver(&sprd_uart_driver);
+
+	return 0;
+}
+
+static int sprd_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct uart_port *up;
+	struct clk *clk;
+	int irq;
+	int index;
+	int ret;
+
+	for (index = 0; index < ARRAY_SIZE(sprd_port); index++)
+		if (sprd_port[index] == NULL)
+			break;
+
+	if (index == ARRAY_SIZE(sprd_port))
+		return -EBUSY;
+
+	index = sprd_probe_dt_alias(index, &pdev->dev);
+
+	sprd_port[index] = devm_kzalloc(&pdev->dev,
+		sizeof(*sprd_port[index]), GFP_KERNEL);
+	if (!sprd_port[index])
+		return -ENOMEM;
+
+	up = &sprd_port[index]->port;
+	up->dev = &pdev->dev;
+	up->line = index;
+	up->type = PORT_SPRD;
+	up->iotype = SERIAL_IO_PORT;
+	up->uartclk = SPRD_DEF_RATE;
+	up->fifosize = SPRD_FIFO_SIZE;
+	up->ops = &serial_sprd_ops;
+	up->flags = UPF_BOOT_AUTOCONF;
+
+	clk = devm_clk_get(&pdev->dev, NULL);
+	if (!IS_ERR(clk))
+		up->uartclk = clk_get_rate(clk);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "not provide mem resource\n");
+		return -ENODEV;
+	}
+	up->mapbase = res->start;
+	up->membase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(up->membase))
+		return PTR_ERR(up->membase);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "not provide irq resource\n");
+		return -ENODEV;
+	}
+	up->irq = irq;
+
+	if (!sprd_ports_num) {
+		ret = uart_register_driver(&sprd_uart_driver);
+		if (ret < 0) {
+			pr_err("Failed to register SPRD-UART driver\n");
+			return ret;
+		}
+	}
+	sprd_ports_num++;
+
+	ret = uart_add_one_port(&sprd_uart_driver, up);
+	if (ret) {
+		sprd_port[index] = NULL;
+		sprd_remove(pdev);
+	}
+
+	platform_set_drvdata(pdev, up);
+
+	return ret;
+}
+
+static int sprd_suspend(struct device *dev)
+{
+	struct sprd_uart_port *sup = dev_get_drvdata(dev);
+
+	uart_suspend_port(&sprd_uart_driver, &sup->port);
+
+	return 0;
+}
+
+static int sprd_resume(struct device *dev)
+{
+	struct sprd_uart_port *sup = dev_get_drvdata(dev);
+
+	uart_resume_port(&sprd_uart_driver, &sup->port);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(sprd_pm_ops, sprd_suspend, sprd_resume);
+
+static const struct of_device_id serial_ids[] = {
+	{.compatible = "sprd,sc9836-uart",},
+	{}
+};
+
+static struct platform_driver sprd_platform_driver = {
+	.probe		= sprd_probe,
+	.remove		= sprd_remove,
+	.driver		= {
+		.name	= "sprd_serial",
+		.of_match_table = of_match_ptr(serial_ids),
+		.pm	= &sprd_pm_ops,
+	},
+};
+
+module_platform_driver(sprd_platform_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Spreadtrum SoC serial driver series");
diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index ee628c489e47..55da91e763bb 100644
--- a/include/uapi/linux/serial_core.h
+++ b/include/uapi/linux/serial_core.h
@@ -252,4 +252,7 @@
 /* Conexant Digicolor */
 #define PORT_DIGICOLOR	110
 
+/* SPRD SERIAL  */
+#define PORT_SPRD	111
+
 #endif /* _UAPILINUX_SERIAL_CORE_H */
-- 
cgit v1.2.3-59-g8ed1b


From eb1527a8738bcfe12a42475aeef105914d63615a Mon Sep 17 00:00:00 2001
From: kbuild test robot <fengguang.wu@intel.com>
Date: Sat, 31 Jan 2015 08:58:34 +0800
Subject: tty/serial: serial8250_set_divisor() can be static

drivers/tty/serial/8250/8250_core.c:2503:6: sparse: symbol 'serial8250_set_divisor' was not declared. Should it be static?

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 57d13b058a48..46ae9fda68b6 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -2500,7 +2500,7 @@ static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
 	return cval;
 }
 
-void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
+static void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
 			    unsigned int quot, unsigned int quot_frac)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
-- 
cgit v1.2.3-59-g8ed1b


From c3bda295eeb002ac708303350d5776c7fe01a127 Mon Sep 17 00:00:00 2001
From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: Mon, 2 Feb 2015 10:47:35 +0100
Subject: serial: samsung: earlycon support depends on
 CONFIG_SERIAL_SAMSUNG_CONSOLE
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

EarlyCon support depends on serial console infrastructure, so the code
implementing it should depend on CONFIG_SERIAL_SAMSUNG_CONSOLE.

This patch fixes the following build break:
CC [M]  drivers/tty/serial/samsung.o
drivers/tty/serial/samsung.c:2468:1: error: expected declaration specifiers or ‘...’ before string constant
drivers/tty/serial/samsung.c:2468:1: error: expected declaration specifiers or ‘...’ before ‘s3c2410_setup_earlycon’
drivers/tty/serial/samsung.c:2487:1: error: expected declaration specifiers or ‘...’ before string constant
drivers/tty/serial/samsung.c:2487:1: error: expected declaration specifiers or ‘...’ before ‘s3c2412_setup_earlycon’
drivers/tty/serial/samsung.c:2488:1: error: expected declaration specifiers or ‘...’ before string constant
drivers/tty/serial/samsung.c:2488:1: error: expected declaration specifiers or ‘...’ before ‘s3c2440_setup_earlycon’
drivers/tty/serial/samsung.c:2489:1: error: expected declaration specifiers or ‘...’ before string constant
drivers/tty/serial/samsung.c:2489:1: error: expected declaration specifiers or ‘...’ before ‘s3c6400_setup_earlycon’
drivers/tty/serial/samsung.c:2506:1: error: expected declaration specifiers or ‘...’ before string constant
drivers/tty/serial/samsung.c:2506:1: error: expected declaration specifiers or ‘...’ before ‘s5pv210_setup_earlycon’
drivers/tty/serial/samsung.c:2507:1: error: expected declaration specifiers or ‘...’ before string constant
drivers/tty/serial/samsung.c:2507:1: error: expected declaration specifiers or ‘...’ before ‘exynos4210_setup_earlycon’
drivers/tty/serial/samsung.c:2468:1: warning: ‘s3c2410_setup_earlycon’ defined but not used [-Wunused-function]
drivers/tty/serial/samsung.c:2487:1: warning: ‘s3c2412_setup_earlycon’ defined but not used [-Wunused-function]
drivers/tty/serial/samsung.c:2488:1: warning: ‘s3c2440_setup_earlycon’ defined but not used [-Wunused-function]
drivers/tty/serial/samsung.c:2489:1: warning: ‘s3c6400_setup_earlycon’ defined but not used [-Wunused-function]
drivers/tty/serial/samsung.c:2506:1: warning: ‘s5pv210_setup_earlycon’ defined but not used [-Wunused-function]
drivers/tty/serial/samsung.c:2507:1: warning: ‘exynos4210_setup_earlycon’ defined but not used [-Wunused-function]
make[3]: *** [drivers/tty/serial/samsung.o] Error 1

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/samsung.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 236abae97613..af821a908720 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -2396,6 +2396,7 @@ static struct platform_driver samsung_serial_driver = {
 
 module_platform_driver(samsung_serial_driver);
 
+#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
 /*
  * Early console.
  */
@@ -2498,6 +2499,7 @@ OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
 			s5pv210_early_console_setup);
 EARLYCON_DECLARE(s5pv210, s5pv210_early_console_setup);
 EARLYCON_DECLARE(exynos4210, s5pv210_early_console_setup);
+#endif
 
 MODULE_ALIAS("platform:samsung-uart");
 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
-- 
cgit v1.2.3-59-g8ed1b


From 3239fd31d4b6b7e0f5629eb458bd67b719050783 Mon Sep 17 00:00:00 2001
From: Lucas Stach <dev@lynxeye.de>
Date: Fri, 5 Dec 2014 20:21:57 +0100
Subject: serial: of-serial: fetch line number from DT

The general agreed way to specify a fixed line number
for a serial console is to provide a "serial" alias
in the devicetree. Start parsing this property in
of_serial.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/of_serial.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index fbb719c89a61..7ff61e24a195 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -102,6 +102,11 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	if (of_property_read_u32(np, "fifo-size", &prop) == 0)
 		port->fifosize = prop;
 
+	/* Check for a fixed line number */
+	ret = of_alias_get_id(np, "serial");
+	if (ret >= 0)
+		port->line = ret;
+
 	port->irq = irq_of_parse_and_map(np, 0);
 	port->iotype = UPIO_MEM;
 	if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
-- 
cgit v1.2.3-59-g8ed1b


From 79ce9d52ae17ff9a29edc2c71638af37f709b9cd Mon Sep 17 00:00:00 2001
From: Fabian Frederick <fabf@skynet.be>
Date: Sat, 10 Jan 2015 18:08:51 +0100
Subject: tty: remove unused variable sprop

sprop is unused in find_console_handle() since commit a752ee56ad84
("tty: Update hypervisor tty drivers to use core stdout parsing code.")

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/ehv_bytechan.c | 1 -
 1 file changed, 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/ehv_bytechan.c b/drivers/tty/ehv_bytechan.c
index 3c60923b0957..342b36b9ad35 100644
--- a/drivers/tty/ehv_bytechan.c
+++ b/drivers/tty/ehv_bytechan.c
@@ -112,7 +112,6 @@ static void disable_tx_interrupt(struct ehv_bc_data *bc)
 static int find_console_handle(void)
 {
 	struct device_node *np = of_stdout;
-	const char *sprop = NULL;
 	const uint32_t *iprop;
 
 	/* We don't care what the aliased node is actually called.  We only
-- 
cgit v1.2.3-59-g8ed1b


From 692132b5b1c5ce97076915d4aed0c61513e18b03 Mon Sep 17 00:00:00 2001
From: Niklas Cassel <nks@flawful.org>
Date: Mon, 2 Feb 2015 23:19:20 +0100
Subject: serial: driver for ETRAX FS UART

This is the last missing piece to get a kernel booting to a prompt in qemu-cris.

Signed-off-by: Niklas Cassel <nks@flawful.org>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/Kconfig        |  10 +
 drivers/tty/serial/Makefile       |   1 +
 drivers/tty/serial/etraxfs-uart.c | 996 ++++++++++++++++++++++++++++++++++++++
 include/uapi/linux/serial_core.h  |   3 +
 4 files changed, 1010 insertions(+)
 create mode 100644 drivers/tty/serial/etraxfs-uart.c

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index ddcc0a4c659c..5d916c7a216b 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1085,6 +1085,16 @@ config SERIAL_VT8500_CONSOLE
 	depends on SERIAL_VT8500=y
 	select SERIAL_CORE_CONSOLE
 
+config SERIAL_ETRAXFS
+	bool "ETRAX FS serial port support"
+	depends on ETRAX_ARCH_V32 && OF
+	select SERIAL_CORE
+
+config SERIAL_ETRAXFS_CONSOLE
+	bool "ETRAX FS serial console support"
+	depends on SERIAL_ETRAXFS
+	select SERIAL_CORE_CONSOLE
+
 config SERIAL_NETX
 	tristate "NetX serial port support"
 	depends on ARCH_NETX
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 431879003ccd..599be4b05a26 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_SERIAL_MPSC) += mpsc.o
 obj-$(CONFIG_SERIAL_MESON) += meson_uart.o
 obj-$(CONFIG_SERIAL_SB1250_DUART) += sb1250-duart.o
 obj-$(CONFIG_ETRAX_SERIAL) += crisv10.o
+obj-$(CONFIG_SERIAL_ETRAXFS) += etraxfs-uart.o
 obj-$(CONFIG_SERIAL_SCCNXP) += sccnxp.o
 obj-$(CONFIG_SERIAL_SC16IS7XX) += sc16is7xx.o
 obj-$(CONFIG_SERIAL_JSM) += jsm/
diff --git a/drivers/tty/serial/etraxfs-uart.c b/drivers/tty/serial/etraxfs-uart.c
new file mode 100644
index 000000000000..a57301a6fe42
--- /dev/null
+++ b/drivers/tty/serial/etraxfs-uart.c
@@ -0,0 +1,996 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/platform_device.h>
+#include <linux/serial_core.h>
+#include <linux/tty_flip.h>
+#include <linux/of.h>
+#include <linux/gpio.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <hwregs/ser_defs.h>
+
+#define DRV_NAME "etraxfs-uart"
+#define UART_NR CONFIG_ETRAX_SERIAL_PORTS
+
+#define MODIFY_REG(instance, reg, var)				\
+	do {							\
+		if (REG_RD_INT(ser, instance, reg) !=		\
+		    REG_TYPE_CONV(int, reg_ser_##reg, var))	\
+			REG_WR(ser, instance, reg, var);	\
+	} while (0)
+
+struct uart_cris_port {
+	struct uart_port port;
+
+	int initialized;
+	int irq;
+
+	void __iomem *regi_ser;
+
+	struct gpio_desc *dtr_pin;
+	struct gpio_desc *dsr_pin;
+	struct gpio_desc *ri_pin;
+	struct gpio_desc *cd_pin;
+
+	int write_ongoing;
+};
+
+static struct uart_driver etraxfs_uart_driver;
+static struct uart_port *console_port;
+static int console_baud = 115200;
+static struct uart_cris_port *etraxfs_uart_ports[UART_NR];
+
+static void cris_serial_port_init(struct uart_port *port, int line);
+static void etraxfs_uart_stop_rx(struct uart_port *port);
+static inline void etraxfs_uart_start_tx_bottom(struct uart_port *port);
+
+#ifdef CONFIG_SERIAL_ETRAXFS_CONSOLE
+static void
+cris_console_write(struct console *co, const char *s, unsigned int count)
+{
+	struct uart_cris_port *up;
+	int i;
+	reg_ser_r_stat_din stat;
+	reg_ser_rw_tr_dma_en tr_dma_en, old;
+
+	up = etraxfs_uart_ports[co->index];
+
+	if (!up)
+		return;
+
+	/* Switch to manual mode. */
+	tr_dma_en = old = REG_RD(ser, up->regi_ser, rw_tr_dma_en);
+	if (tr_dma_en.en == regk_ser_yes) {
+		tr_dma_en.en = regk_ser_no;
+		REG_WR(ser, up->regi_ser, rw_tr_dma_en, tr_dma_en);
+	}
+
+	/* Send data. */
+	for (i = 0; i < count; i++) {
+		/* LF -> CRLF */
+		if (s[i] == '\n') {
+			do {
+				stat = REG_RD(ser, up->regi_ser, r_stat_din);
+			} while (!stat.tr_rdy);
+			REG_WR_INT(ser, up->regi_ser, rw_dout, '\r');
+		}
+		/* Wait until transmitter is ready and send. */
+		do {
+			stat = REG_RD(ser, up->regi_ser, r_stat_din);
+		} while (!stat.tr_rdy);
+		REG_WR_INT(ser, up->regi_ser, rw_dout, s[i]);
+	}
+
+	/* Restore mode. */
+	if (tr_dma_en.en != old.en)
+		REG_WR(ser, up->regi_ser, rw_tr_dma_en, old);
+}
+
+static int __init
+cris_console_setup(struct console *co, char *options)
+{
+	struct uart_port *port;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+
+	if (co->index < 0 || co->index >= UART_NR)
+		co->index = 0;
+	port = &etraxfs_uart_ports[co->index]->port;
+	console_port = port;
+
+	co->flags |= CON_CONSDEV;
+
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+	console_baud = baud;
+	cris_serial_port_init(port, co->index);
+	uart_set_options(port, co, baud, parity, bits, flow);
+
+	return 0;
+}
+
+static struct tty_driver *cris_console_device(struct console *co, int *index)
+{
+	struct uart_driver *p = co->data;
+	*index = co->index;
+	return p->tty_driver;
+}
+
+static struct console cris_console = {
+	.name = "ttyS",
+	.write = cris_console_write,
+	.device = cris_console_device,
+	.setup = cris_console_setup,
+	.flags = CON_PRINTBUFFER,
+	.index = -1,
+	.data = &etraxfs_uart_driver,
+};
+#endif /* CONFIG_SERIAL_ETRAXFS_CONSOLE */
+
+static struct uart_driver etraxfs_uart_driver = {
+	.owner = THIS_MODULE,
+	.driver_name = "serial",
+	.dev_name = "ttyS",
+	.major = TTY_MAJOR,
+	.minor = 64,
+	.nr = UART_NR,
+#ifdef CONFIG_SERIAL_ETRAXFS_CONSOLE
+	.cons = &cris_console,
+#endif /* CONFIG_SERIAL_ETRAXFS_CONSOLE */
+};
+
+static inline int crisv32_serial_get_rts(struct uart_cris_port *up)
+{
+	void __iomem *regi_ser = up->regi_ser;
+	/*
+	 * Return what the user has controlled rts to or
+	 * what the pin is? (if auto_rts is used it differs during tx)
+	 */
+	reg_ser_r_stat_din rstat = REG_RD(ser, regi_ser, r_stat_din);
+
+	return !(rstat.rts_n == regk_ser_active);
+}
+
+/*
+ * A set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive
+ *                                            0=0V    , 1=3.3V
+ */
+static inline void crisv32_serial_set_rts(struct uart_cris_port *up,
+					  int set, int force)
+{
+	void __iomem *regi_ser = up->regi_ser;
+
+	unsigned long flags;
+	reg_ser_rw_rec_ctrl rec_ctrl;
+
+	local_irq_save(flags);
+	rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl);
+
+	if (set)
+		rec_ctrl.rts_n = regk_ser_active;
+	else
+		rec_ctrl.rts_n = regk_ser_inactive;
+	REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl);
+	local_irq_restore(flags);
+}
+
+static inline int crisv32_serial_get_cts(struct uart_cris_port *up)
+{
+	void __iomem *regi_ser = up->regi_ser;
+	reg_ser_r_stat_din rstat = REG_RD(ser, regi_ser, r_stat_din);
+
+	return (rstat.cts_n == regk_ser_active);
+}
+
+/*
+ * Send a single character for XON/XOFF purposes.  We do it in this separate
+ * function instead of the alternative support port.x_char, in the ...start_tx
+ * function, so we don't mix up this case with possibly enabling transmission
+ * of queued-up data (in case that's disabled after *receiving* an XOFF or
+ * negative CTS).  This function is used for both DMA and non-DMA case; see HW
+ * docs specifically blessing sending characters manually when DMA for
+ * transmission is enabled and running.  We may be asked to transmit despite
+ * the transmitter being disabled by a ..._stop_tx call so we need to enable
+ * it temporarily but restore the state afterwards.
+ */
+static void etraxfs_uart_send_xchar(struct uart_port *port, char ch)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+	reg_ser_rw_dout dout = { .data = ch };
+	reg_ser_rw_ack_intr ack_intr = { .tr_rdy = regk_ser_yes };
+	reg_ser_r_stat_din rstat;
+	reg_ser_rw_tr_ctrl prev_tr_ctrl, tr_ctrl;
+	void __iomem *regi_ser = up->regi_ser;
+	unsigned long flags;
+
+	/*
+	 * Wait for tr_rdy in case a character is already being output.  Make
+	 * sure we have integrity between the register reads and the writes
+	 * below, but don't busy-wait with interrupts off and the port lock
+	 * taken.
+	 */
+	spin_lock_irqsave(&port->lock, flags);
+	do {
+		spin_unlock_irqrestore(&port->lock, flags);
+		spin_lock_irqsave(&port->lock, flags);
+		prev_tr_ctrl = tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl);
+		rstat = REG_RD(ser, regi_ser, r_stat_din);
+	} while (!rstat.tr_rdy);
+
+	/*
+	 * Ack an interrupt if one was just issued for the previous character
+	 * that was output.  This is required for non-DMA as the interrupt is
+	 * used as the only indicator that the transmitter is ready and it
+	 * isn't while this x_char is being transmitted.
+	 */
+	REG_WR(ser, regi_ser, rw_ack_intr, ack_intr);
+
+	/* Enable the transmitter in case it was disabled. */
+	tr_ctrl.stop = 0;
+	REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl);
+
+	/*
+	 * Finally, send the blessed character; nothing should stop it now,
+	 * except for an xoff-detected state, which we'll handle below.
+	 */
+	REG_WR(ser, regi_ser, rw_dout, dout);
+	up->port.icount.tx++;
+
+	/* There might be an xoff state to clear. */
+	rstat = REG_RD(ser, up->regi_ser, r_stat_din);
+
+	/*
+	 * Clear any xoff state that *may* have been there to
+	 * inhibit transmission of the character.
+	 */
+	if (rstat.xoff_detect) {
+		reg_ser_rw_xoff_clr xoff_clr = { .clr = 1 };
+		reg_ser_rw_tr_dma_en tr_dma_en;
+
+		REG_WR(ser, regi_ser, rw_xoff_clr, xoff_clr);
+		tr_dma_en = REG_RD(ser, regi_ser, rw_tr_dma_en);
+
+		/*
+		 * If we had an xoff state but cleared it, instead sneak in a
+		 * disabled state for the transmitter, after the character we
+		 * sent.  Thus we keep the port disabled, just as if the xoff
+		 * state was still in effect (or actually, as if stop_tx had
+		 * been called, as we stop DMA too).
+		 */
+		prev_tr_ctrl.stop = 1;
+
+		tr_dma_en.en = 0;
+		REG_WR(ser, regi_ser, rw_tr_dma_en, tr_dma_en);
+	}
+
+	/* Restore "previous" enabled/disabled state of the transmitter. */
+	REG_WR(ser, regi_ser, rw_tr_ctrl, prev_tr_ctrl);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/*
+ * Do not spin_lock_irqsave or disable interrupts by other means here; it's
+ * already done by the caller.
+ */
+static void etraxfs_uart_start_tx(struct uart_port *port)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+
+	/* we have already done below if a write is ongoing */
+	if (up->write_ongoing)
+		return;
+
+	/* Signal that write is ongoing */
+	up->write_ongoing = 1;
+
+	etraxfs_uart_start_tx_bottom(port);
+}
+
+static inline void etraxfs_uart_start_tx_bottom(struct uart_port *port)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+	void __iomem *regi_ser = up->regi_ser;
+	reg_ser_rw_tr_ctrl tr_ctrl;
+	reg_ser_rw_intr_mask intr_mask;
+
+	tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl);
+	tr_ctrl.stop = regk_ser_no;
+	REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl);
+	intr_mask = REG_RD(ser, regi_ser, rw_intr_mask);
+	intr_mask.tr_rdy = regk_ser_yes;
+	REG_WR(ser, regi_ser, rw_intr_mask, intr_mask);
+}
+
+/*
+ * This function handles both the DMA and non-DMA case by ordering the
+ * transmitter to stop of after the current character.  We don't need to wait
+ * for any such character to be completely transmitted; we do that where it
+ * matters, like in etraxfs_uart_set_termios.  Don't busy-wait here; see
+ * Documentation/serial/driver: this function is called within
+ * spin_lock_irq{,save} and thus separate ones would be disastrous (when SMP).
+ * There's no documented need to set the txd pin to any particular value;
+ * break setting is controlled solely by etraxfs_uart_break_ctl.
+ */
+static void etraxfs_uart_stop_tx(struct uart_port *port)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+	void __iomem *regi_ser = up->regi_ser;
+	reg_ser_rw_tr_ctrl tr_ctrl;
+	reg_ser_rw_intr_mask intr_mask;
+	reg_ser_rw_tr_dma_en tr_dma_en = {0};
+	reg_ser_rw_xoff_clr xoff_clr = {0};
+
+	/*
+	 * For the non-DMA case, we'd get a tr_rdy interrupt that we're not
+	 * interested in as we're not transmitting any characters.  For the
+	 * DMA case, that interrupt is already turned off, but no reason to
+	 * waste code on conditionals here.
+	 */
+	intr_mask = REG_RD(ser, regi_ser, rw_intr_mask);
+	intr_mask.tr_rdy = regk_ser_no;
+	REG_WR(ser, regi_ser, rw_intr_mask, intr_mask);
+
+	tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl);
+	tr_ctrl.stop = 1;
+	REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl);
+
+	/*
+	 * Always clear possible hardware xoff-detected state here, no need to
+	 * unnecessary consider mctrl settings and when they change.  We clear
+	 * it here rather than in start_tx: both functions are called as the
+	 * effect of XOFF processing, but start_tx is also called when upper
+	 * levels tell the driver that there are more characters to send, so
+	 * avoid adding code there.
+	 */
+	xoff_clr.clr = 1;
+	REG_WR(ser, regi_ser, rw_xoff_clr, xoff_clr);
+
+	/*
+	 * Disable transmitter DMA, so that if we're in XON/XOFF, we can send
+	 * those single characters without also giving go-ahead for queued up
+	 * DMA data.
+	 */
+	tr_dma_en.en = 0;
+	REG_WR(ser, regi_ser, rw_tr_dma_en, tr_dma_en);
+
+	/*
+	 * Make sure that write_ongoing is reset when stopping tx.
+	 */
+	up->write_ongoing = 0;
+}
+
+static void etraxfs_uart_stop_rx(struct uart_port *port)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+	void __iomem *regi_ser = up->regi_ser;
+	reg_ser_rw_rec_ctrl rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl);
+
+	rec_ctrl.en = regk_ser_no;
+	REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl);
+}
+
+static void etraxfs_uart_enable_ms(struct uart_port *port)
+{
+}
+
+static void check_modem_status(struct uart_cris_port *up)
+{
+}
+
+static unsigned int etraxfs_uart_tx_empty(struct uart_port *port)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+	unsigned long flags;
+	unsigned int ret;
+	reg_ser_r_stat_din rstat = {0};
+
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	rstat = REG_RD(ser, up->regi_ser, r_stat_din);
+	ret = rstat.tr_empty ? TIOCSER_TEMT : 0;
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
+	return ret;
+}
+static unsigned int etraxfs_uart_get_mctrl(struct uart_port *port)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+	unsigned int ret;
+
+	ret = 0;
+	if (crisv32_serial_get_rts(up))
+		ret |= TIOCM_RTS;
+	/* DTR is active low */
+	if (up->dtr_pin && !gpiod_get_raw_value(up->dtr_pin))
+		ret |= TIOCM_DTR;
+	/* CD is active low */
+	if (up->cd_pin && !gpiod_get_raw_value(up->cd_pin))
+		ret |= TIOCM_CD;
+	/* RI is active low */
+	if (up->ri_pin && !gpiod_get_raw_value(up->ri_pin))
+		ret |= TIOCM_RI;
+	/* DSR is active low */
+	if (up->dsr_pin && !gpiod_get_raw_value(up->dsr_pin))
+		ret |= TIOCM_DSR;
+	if (crisv32_serial_get_cts(up))
+		ret |= TIOCM_CTS;
+	return ret;
+}
+
+static void etraxfs_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+
+	crisv32_serial_set_rts(up, mctrl & TIOCM_RTS ? 1 : 0, 0);
+	/* DTR is active low */
+	if (up->dtr_pin)
+		gpiod_set_raw_value(up->dtr_pin, mctrl & TIOCM_DTR ? 0 : 1);
+	/* RI is active low */
+	if (up->ri_pin)
+		gpiod_set_raw_value(up->ri_pin, mctrl & TIOCM_RNG ? 0 : 1);
+	/* CD is active low */
+	if (up->cd_pin)
+		gpiod_set_raw_value(up->cd_pin, mctrl & TIOCM_CD ? 0 : 1);
+}
+
+static void etraxfs_uart_break_ctl(struct uart_port *port, int break_state)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+	unsigned long flags;
+	reg_ser_rw_tr_ctrl tr_ctrl;
+	reg_ser_rw_tr_dma_en tr_dma_en;
+	reg_ser_rw_intr_mask intr_mask;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	tr_ctrl = REG_RD(ser, up->regi_ser, rw_tr_ctrl);
+	tr_dma_en = REG_RD(ser, up->regi_ser, rw_tr_dma_en);
+	intr_mask = REG_RD(ser, up->regi_ser, rw_intr_mask);
+
+	if (break_state != 0) { /* Send break */
+		/*
+		 * We need to disable DMA (if used) or tr_rdy interrupts if no
+		 * DMA.  No need to make this conditional on use of DMA;
+		 * disabling will be a no-op for the other mode.
+		 */
+		intr_mask.tr_rdy = regk_ser_no;
+		tr_dma_en.en = 0;
+
+		/*
+		 * Stop transmission and set the txd pin to 0 after the
+		 * current character.  The txd setting will take effect after
+		 * any current transmission has completed.
+		 */
+		tr_ctrl.stop = 1;
+		tr_ctrl.txd = 0;
+	} else {
+		/* Re-enable the serial interrupt. */
+		intr_mask.tr_rdy = regk_ser_yes;
+
+		tr_ctrl.stop = 0;
+		tr_ctrl.txd = 1;
+	}
+	REG_WR(ser, up->regi_ser, rw_tr_ctrl, tr_ctrl);
+	REG_WR(ser, up->regi_ser, rw_tr_dma_en, tr_dma_en);
+	REG_WR(ser, up->regi_ser, rw_intr_mask, intr_mask);
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void
+transmit_chars_no_dma(struct uart_cris_port *up)
+{
+	int max_count;
+	struct circ_buf *xmit = &up->port.state->xmit;
+
+	void __iomem *regi_ser = up->regi_ser;
+	reg_ser_r_stat_din rstat;
+	reg_ser_rw_ack_intr ack_intr = { .tr_rdy = regk_ser_yes };
+
+	if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+		/* No more to send, so disable the interrupt. */
+		reg_ser_rw_intr_mask intr_mask;
+
+		intr_mask = REG_RD(ser, regi_ser, rw_intr_mask);
+		intr_mask.tr_rdy = 0;
+		intr_mask.tr_empty = 0;
+		REG_WR(ser, regi_ser, rw_intr_mask, intr_mask);
+		up->write_ongoing = 0;
+		return;
+	}
+
+	/* If the serport is fast, we send up to max_count bytes before
+	   exiting the loop.  */
+	max_count = 64;
+	do {
+		reg_ser_rw_dout dout = { .data = xmit->buf[xmit->tail] };
+
+		REG_WR(ser, regi_ser, rw_dout, dout);
+		REG_WR(ser, regi_ser, rw_ack_intr, ack_intr);
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1);
+		up->port.icount.tx++;
+		if (xmit->head == xmit->tail)
+			break;
+		rstat = REG_RD(ser, regi_ser, r_stat_din);
+	} while ((--max_count > 0) && rstat.tr_rdy);
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(&up->port);
+}
+
+static void receive_chars_no_dma(struct uart_cris_port *up)
+{
+	reg_ser_rs_stat_din stat_din;
+	reg_ser_r_stat_din rstat;
+	struct tty_port *port;
+	struct uart_icount *icount;
+	int max_count = 16;
+	char flag;
+	reg_ser_rw_ack_intr ack_intr = { 0 };
+
+	rstat = REG_RD(ser, up->regi_ser, r_stat_din);
+	icount = &up->port.icount;
+	port = &up->port.state->port;
+
+	do {
+		stat_din = REG_RD(ser, up->regi_ser, rs_stat_din);
+
+		flag = TTY_NORMAL;
+		ack_intr.dav = 1;
+		REG_WR(ser, up->regi_ser, rw_ack_intr, ack_intr);
+		icount->rx++;
+
+		if (stat_din.framing_err | stat_din.par_err | stat_din.orun) {
+			if (stat_din.data == 0x00 &&
+			    stat_din.framing_err) {
+				/* Most likely a break. */
+				flag = TTY_BREAK;
+				icount->brk++;
+			} else if (stat_din.par_err) {
+				flag = TTY_PARITY;
+				icount->parity++;
+			} else if (stat_din.orun) {
+				flag = TTY_OVERRUN;
+				icount->overrun++;
+			} else if (stat_din.framing_err) {
+				flag = TTY_FRAME;
+				icount->frame++;
+			}
+		}
+
+		/*
+		 * If this becomes important, we probably *could* handle this
+		 * gracefully by keeping track of the unhandled character.
+		 */
+		if (!tty_insert_flip_char(port, stat_din.data, flag))
+			panic("%s: No tty buffer space", __func__);
+		rstat = REG_RD(ser, up->regi_ser, r_stat_din);
+	} while (rstat.dav && (max_count-- > 0));
+	spin_unlock(&up->port.lock);
+	tty_flip_buffer_push(port);
+	spin_lock(&up->port.lock);
+}
+
+static irqreturn_t
+ser_interrupt(int irq, void *dev_id)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)dev_id;
+	void __iomem *regi_ser;
+	int handled = 0;
+
+	spin_lock(&up->port.lock);
+
+	regi_ser = up->regi_ser;
+
+	if (regi_ser) {
+		reg_ser_r_masked_intr masked_intr;
+
+		masked_intr = REG_RD(ser, regi_ser, r_masked_intr);
+		/*
+		 * Check what interrupts are active before taking
+		 * actions. If DMA is used the interrupt shouldn't
+		 * be enabled.
+		 */
+		if (masked_intr.dav) {
+			receive_chars_no_dma(up);
+			handled = 1;
+		}
+		check_modem_status(up);
+
+		if (masked_intr.tr_rdy) {
+			transmit_chars_no_dma(up);
+			handled = 1;
+		}
+	}
+	spin_unlock(&up->port.lock);
+	return IRQ_RETVAL(handled);
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+static int etraxfs_uart_get_poll_char(struct uart_port *port)
+{
+	reg_ser_rs_stat_din stat;
+	reg_ser_rw_ack_intr ack_intr = { 0 };
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+
+	do {
+		stat = REG_RD(ser, up->regi_ser, rs_stat_din);
+	} while (!stat.dav);
+
+	/* Ack the data_avail interrupt. */
+	ack_intr.dav = 1;
+	REG_WR(ser, up->regi_ser, rw_ack_intr, ack_intr);
+
+	return stat.data;
+}
+
+static void etraxfs_uart_put_poll_char(struct uart_port *port,
+					unsigned char c)
+{
+	reg_ser_r_stat_din stat;
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+
+	do {
+		stat = REG_RD(ser, up->regi_ser, r_stat_din);
+	} while (!stat.tr_rdy);
+	REG_WR_INT(ser, up->regi_ser, rw_dout, c);
+}
+#endif /* CONFIG_CONSOLE_POLL */
+
+static int etraxfs_uart_startup(struct uart_port *port)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+	unsigned long flags;
+	reg_ser_rw_intr_mask ser_intr_mask = {0};
+
+	ser_intr_mask.dav = regk_ser_yes;
+
+	if (request_irq(etraxfs_uart_ports[port->line]->irq, ser_interrupt,
+			0, DRV_NAME, etraxfs_uart_ports[port->line]))
+		panic("irq ser%d", port->line);
+
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	REG_WR(ser, up->regi_ser, rw_intr_mask, ser_intr_mask);
+
+	etraxfs_uart_set_mctrl(&up->port, up->port.mctrl);
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	return 0;
+}
+
+static void etraxfs_uart_shutdown(struct uart_port *port)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+	unsigned long flags;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	etraxfs_uart_stop_tx(port);
+	etraxfs_uart_stop_rx(port);
+
+	free_irq(etraxfs_uart_ports[port->line]->irq,
+		 etraxfs_uart_ports[port->line]);
+
+	etraxfs_uart_set_mctrl(&up->port, up->port.mctrl);
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+}
+
+static void
+etraxfs_uart_set_termios(struct uart_port *port, struct ktermios *termios,
+			 struct ktermios *old)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+	unsigned long flags;
+	reg_ser_rw_xoff xoff;
+	reg_ser_rw_xoff_clr xoff_clr = {0};
+	reg_ser_rw_tr_ctrl tx_ctrl = {0};
+	reg_ser_rw_tr_dma_en tx_dma_en = {0};
+	reg_ser_rw_rec_ctrl rx_ctrl = {0};
+	reg_ser_rw_tr_baud_div tx_baud_div = {0};
+	reg_ser_rw_rec_baud_div rx_baud_div = {0};
+	int baud;
+
+	if (old &&
+	    termios->c_cflag == old->c_cflag &&
+	    termios->c_iflag == old->c_iflag)
+		return;
+
+	/* Tx: 8 bit, no/even parity, 1 stop bit, no cts. */
+	tx_ctrl.base_freq = regk_ser_f29_493;
+	tx_ctrl.en = 0;
+	tx_ctrl.stop = 0;
+	tx_ctrl.auto_rts = regk_ser_no;
+	tx_ctrl.txd = 1;
+	tx_ctrl.auto_cts = 0;
+	/* Rx: 8 bit, no/even parity. */
+	rx_ctrl.dma_err = regk_ser_stop;
+	rx_ctrl.sampling = regk_ser_majority;
+	rx_ctrl.timeout = 1;
+
+	rx_ctrl.rts_n = regk_ser_inactive;
+
+	/* Common for tx and rx: 8N1. */
+	tx_ctrl.data_bits = regk_ser_bits8;
+	rx_ctrl.data_bits = regk_ser_bits8;
+	tx_ctrl.par = regk_ser_even;
+	rx_ctrl.par = regk_ser_even;
+	tx_ctrl.par_en = regk_ser_no;
+	rx_ctrl.par_en = regk_ser_no;
+
+	tx_ctrl.stop_bits = regk_ser_bits1;
+
+	/*
+	 * Change baud-rate and write it to the hardware.
+	 *
+	 * baud_clock = base_freq / (divisor*8)
+	 * divisor = base_freq / (baud_clock * 8)
+	 * base_freq is either:
+	 * off, ext, 29.493MHz, 32.000 MHz, 32.768 MHz or 100 MHz
+	 * 20.493MHz is used for standard baudrates
+	 */
+
+	/*
+	 * For the console port we keep the original baudrate here.  Not very
+	 * beautiful.
+	 */
+	if ((port != console_port) || old)
+		baud = uart_get_baud_rate(port, termios, old, 0,
+					  port->uartclk / 8);
+	else
+		baud = console_baud;
+
+	tx_baud_div.div = 29493000 / (8 * baud);
+	/* Rx uses same as tx. */
+	rx_baud_div.div = tx_baud_div.div;
+	rx_ctrl.base_freq = tx_ctrl.base_freq;
+
+	if ((termios->c_cflag & CSIZE) == CS7) {
+		/* Set 7 bit mode. */
+		tx_ctrl.data_bits = regk_ser_bits7;
+		rx_ctrl.data_bits = regk_ser_bits7;
+	}
+
+	if (termios->c_cflag & CSTOPB) {
+		/* Set 2 stop bit mode. */
+		tx_ctrl.stop_bits = regk_ser_bits2;
+	}
+
+	if (termios->c_cflag & PARENB) {
+		/* Enable parity. */
+		tx_ctrl.par_en = regk_ser_yes;
+		rx_ctrl.par_en = regk_ser_yes;
+	}
+
+	if (termios->c_cflag & CMSPAR) {
+		if (termios->c_cflag & PARODD) {
+			/* Set mark parity if PARODD and CMSPAR. */
+			tx_ctrl.par = regk_ser_mark;
+			rx_ctrl.par = regk_ser_mark;
+		} else {
+			tx_ctrl.par = regk_ser_space;
+			rx_ctrl.par = regk_ser_space;
+		}
+	} else {
+		if (termios->c_cflag & PARODD) {
+			/* Set odd parity. */
+		       tx_ctrl.par = regk_ser_odd;
+		       rx_ctrl.par = regk_ser_odd;
+		}
+	}
+
+	if (termios->c_cflag & CRTSCTS) {
+		/* Enable automatic CTS handling. */
+		tx_ctrl.auto_cts = regk_ser_yes;
+	}
+
+	/* Make sure the tx and rx are enabled. */
+	tx_ctrl.en = regk_ser_yes;
+	rx_ctrl.en = regk_ser_yes;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	tx_dma_en.en = 0;
+	REG_WR(ser, up->regi_ser, rw_tr_dma_en, tx_dma_en);
+
+	/* Actually write the control regs (if modified) to the hardware. */
+	uart_update_timeout(port, termios->c_cflag, port->uartclk/8);
+	MODIFY_REG(up->regi_ser, rw_rec_baud_div, rx_baud_div);
+	MODIFY_REG(up->regi_ser, rw_rec_ctrl, rx_ctrl);
+
+	MODIFY_REG(up->regi_ser, rw_tr_baud_div, tx_baud_div);
+	MODIFY_REG(up->regi_ser, rw_tr_ctrl, tx_ctrl);
+
+	tx_dma_en.en = 0;
+	REG_WR(ser, up->regi_ser, rw_tr_dma_en, tx_dma_en);
+
+	xoff = REG_RD(ser, up->regi_ser, rw_xoff);
+
+	if (up->port.state && up->port.state->port.tty &&
+	    (up->port.state->port.tty->termios.c_iflag & IXON)) {
+		xoff.chr = STOP_CHAR(up->port.state->port.tty);
+		xoff.automatic = regk_ser_yes;
+	} else
+		xoff.automatic = regk_ser_no;
+
+	MODIFY_REG(up->regi_ser, rw_xoff, xoff);
+
+	/*
+	 * Make sure we don't start in an automatically shut-off state due to
+	 * a previous early exit.
+	 */
+	xoff_clr.clr = 1;
+	REG_WR(ser, up->regi_ser, rw_xoff_clr, xoff_clr);
+
+	etraxfs_uart_set_mctrl(&up->port, up->port.mctrl);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static const char *
+etraxfs_uart_type(struct uart_port *port)
+{
+	return "CRISv32";
+}
+
+static void etraxfs_uart_release_port(struct uart_port *port)
+{
+}
+
+static int etraxfs_uart_request_port(struct uart_port *port)
+{
+	return 0;
+}
+
+static void etraxfs_uart_config_port(struct uart_port *port, int flags)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+
+	up->port.type = PORT_CRIS;
+}
+
+static const struct uart_ops etraxfs_uart_pops = {
+	.tx_empty = etraxfs_uart_tx_empty,
+	.set_mctrl = etraxfs_uart_set_mctrl,
+	.get_mctrl = etraxfs_uart_get_mctrl,
+	.stop_tx = etraxfs_uart_stop_tx,
+	.start_tx = etraxfs_uart_start_tx,
+	.send_xchar = etraxfs_uart_send_xchar,
+	.stop_rx = etraxfs_uart_stop_rx,
+	.enable_ms = etraxfs_uart_enable_ms,
+	.break_ctl = etraxfs_uart_break_ctl,
+	.startup = etraxfs_uart_startup,
+	.shutdown = etraxfs_uart_shutdown,
+	.set_termios = etraxfs_uart_set_termios,
+	.type = etraxfs_uart_type,
+	.release_port = etraxfs_uart_release_port,
+	.request_port = etraxfs_uart_request_port,
+	.config_port = etraxfs_uart_config_port,
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_get_char = etraxfs_uart_get_poll_char,
+	.poll_put_char = etraxfs_uart_put_poll_char,
+#endif
+};
+
+static void cris_serial_port_init(struct uart_port *port, int line)
+{
+	struct uart_cris_port *up = (struct uart_cris_port *)port;
+
+	if (up->initialized)
+		return;
+	up->initialized = 1;
+	port->line = line;
+	spin_lock_init(&port->lock);
+	port->ops = &etraxfs_uart_pops;
+	port->irq = up->irq;
+	port->iobase = (unsigned long) up->regi_ser;
+	port->uartclk = 29493000;
+
+	/*
+	 * We can't fit any more than 255 here (unsigned char), though
+	 * actually UART_XMIT_SIZE characters could be pending output.
+	 * At time of this writing, the definition of "fifosize" is here the
+	 * amount of characters that can be pending output after a start_tx call
+	 * until tx_empty returns 1: see serial_core.c:uart_wait_until_sent.
+	 * This matters for timeout calculations unfortunately, but keeping
+	 * larger amounts at the DMA wouldn't win much so let's just play nice.
+	 */
+	port->fifosize = 255;
+	port->flags = UPF_BOOT_AUTOCONF;
+}
+
+static int etraxfs_uart_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct uart_cris_port *up;
+	int dev_id;
+
+	if (!np)
+		return -ENODEV;
+
+	dev_id = of_alias_get_id(np, "serial");
+	if (dev_id < 0)
+		dev_id = 0;
+
+	if (dev_id >= UART_NR)
+		return -EINVAL;
+
+	if (etraxfs_uart_ports[dev_id])
+		return -EBUSY;
+
+	up = devm_kzalloc(&pdev->dev, sizeof(struct uart_cris_port),
+			  GFP_KERNEL);
+	if (!up)
+		return -ENOMEM;
+
+	up->irq = irq_of_parse_and_map(np, 0);
+	up->regi_ser = of_iomap(np, 0);
+	up->dtr_pin = devm_gpiod_get_optional(&pdev->dev, "dtr");
+	up->dsr_pin = devm_gpiod_get_optional(&pdev->dev, "dsr");
+	up->ri_pin = devm_gpiod_get_optional(&pdev->dev, "ri");
+	up->cd_pin = devm_gpiod_get_optional(&pdev->dev, "cd");
+	up->port.dev = &pdev->dev;
+	cris_serial_port_init(&up->port, dev_id);
+
+	etraxfs_uart_ports[dev_id] = up;
+	platform_set_drvdata(pdev, &up->port);
+	uart_add_one_port(&etraxfs_uart_driver, &up->port);
+
+	return 0;
+}
+
+static int etraxfs_uart_remove(struct platform_device *pdev)
+{
+	struct uart_port *port;
+
+	port = platform_get_drvdata(pdev);
+	uart_remove_one_port(&etraxfs_uart_driver, port);
+	etraxfs_uart_ports[pdev->id] = NULL;
+
+	return 0;
+}
+
+static const struct of_device_id etraxfs_uart_dt_ids[] = {
+	{ .compatible = "axis,etraxfs-uart" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, etraxfs_uart_dt_ids);
+
+static struct platform_driver etraxfs_uart_platform_driver = {
+	.driver = {
+		.name   = DRV_NAME,
+		.of_match_table	= of_match_ptr(etraxfs_uart_dt_ids),
+	},
+	.probe          = etraxfs_uart_probe,
+	.remove         = etraxfs_uart_remove,
+};
+
+static int __init etraxfs_uart_init(void)
+{
+	int ret;
+
+	ret = uart_register_driver(&etraxfs_uart_driver);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&etraxfs_uart_platform_driver);
+	if (ret)
+		uart_unregister_driver(&etraxfs_uart_driver);
+
+	return ret;
+}
+
+static void __exit etraxfs_uart_exit(void)
+{
+	platform_driver_unregister(&etraxfs_uart_platform_driver);
+	uart_unregister_driver(&etraxfs_uart_driver);
+}
+
+module_init(etraxfs_uart_init);
+module_exit(etraxfs_uart_exit);
diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index 55da91e763bb..b2122813f18a 100644
--- a/include/uapi/linux/serial_core.h
+++ b/include/uapi/linux/serial_core.h
@@ -255,4 +255,7 @@
 /* SPRD SERIAL  */
 #define PORT_SPRD	111
 
+/* Cris v10 / v32 SoC */
+#define PORT_CRIS	112
+
 #endif /* _UAPILINUX_SERIAL_CORE_H */
-- 
cgit v1.2.3-59-g8ed1b


From c09babfab7ae8c7d79a5dce9d866fbb28b82dde4 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Mon, 2 Feb 2015 15:47:07 -0500
Subject: serial: 8250: Fix UART_BUG_TXEN workaround

UARTs which do not trigger THRE interrupt if the fifo is already
empty when the interrupt is enabled need tx primed manually. These
UARTs are identified by the UART_BUG_TXEN flag to enable the
required workaround.

However, the current workaround is broken; if the fifo is already
empty but the shifter is still transmitting, then serial8250_tx_chars()
will not be called but no further THRE interrupt will occur, and
tx will stall. The appropriate check is for fifo empty (THRE), not
transmitter empty (TEMT).

Signed-off-by: Dick Hollenbeck <dick@softplc.com>
[pjh: rewrote commit log]
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/tty')

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 46ae9fda68b6..e3b9570a1eff 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1388,7 +1388,7 @@ static void serial8250_start_tx(struct uart_port *port)
 			unsigned char lsr;
 			lsr = serial_in(up, UART_LSR);
 			up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
-			if (lsr & UART_LSR_TEMT)
+			if (lsr & UART_LSR_THRE)
 				serial8250_tx_chars(up);
 		}
 	}
-- 
cgit v1.2.3-59-g8ed1b