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path: root/drivers/tty/serial/omap-serial.c
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Diffstat (limited to 'drivers/tty/serial/omap-serial.c')
-rw-r--r--drivers/tty/serial/omap-serial.c265
1 files changed, 93 insertions, 172 deletions
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 48017cec7f2f..7d0d2718ef59 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -19,6 +19,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/console.h>
+#include <linux/serial.h>
#include <linux/serial_reg.h>
#include <linux/delay.h>
#include <linux/slab.h>
@@ -33,12 +34,9 @@
#include <linux/pm_wakeirq.h>
#include <linux/of.h>
#include <linux/of_irq.h>
-#include <linux/gpio.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/platform_data/serial-omap.h>
-#include <dt-bindings/gpio/gpio.h>
-
#define OMAP_MAX_HSUART_PORTS 10
#define UART_BUILD_REVISION(x, y) (((x) << 8) | (y))
@@ -155,13 +153,15 @@ struct uart_omap_port {
u32 errata;
u32 features;
- int rts_gpio;
+ struct gpio_desc *rts_gpiod;
struct pm_qos_request pm_qos_request;
u32 latency;
u32 calc_latency;
struct work_struct qos_work;
bool is_suspending;
+
+ unsigned int rs485_tx_filter_count;
};
#define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
@@ -277,11 +277,8 @@ static void serial_omap_enable_ms(struct uart_port *port)
dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
- pm_runtime_get_sync(up->dev);
up->ier |= UART_IER_MSI;
serial_out(up, UART_IER, up->ier);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
}
static void serial_omap_stop_tx(struct uart_port *port)
@@ -289,8 +286,6 @@ static void serial_omap_stop_tx(struct uart_port *port)
struct uart_omap_port *up = to_uart_omap_port(port);
int res;
- pm_runtime_get_sync(up->dev);
-
/* Handle RS-485 */
if (port->rs485.flags & SER_RS485_ENABLED) {
if (up->scr & OMAP_UART_SCR_TX_EMPTY) {
@@ -305,11 +300,11 @@ static void serial_omap_stop_tx(struct uart_port *port)
serial_out(up, UART_OMAP_SCR, up->scr);
res = (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) ?
1 : 0;
- if (gpio_get_value(up->rts_gpio) != res) {
+ if (gpiod_get_value(up->rts_gpiod) != res) {
if (port->rs485.delay_rts_after_send > 0)
mdelay(
port->rs485.delay_rts_after_send);
- gpio_set_value(up->rts_gpio, res);
+ gpiod_set_value(up->rts_gpiod, res);
}
} else {
/* We're asked to stop, but there's still stuff in the
@@ -330,34 +325,24 @@ static void serial_omap_stop_tx(struct uart_port *port)
up->ier &= ~UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
}
-
- if ((port->rs485.flags & SER_RS485_ENABLED) &&
- !(port->rs485.flags & SER_RS485_RX_DURING_TX)) {
- /*
- * Empty the RX FIFO, we are not interested in anything
- * received during the half-duplex transmission.
- */
- serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_RCVR);
- /* Re-enable RX interrupts */
- up->ier |= UART_IER_RLSI | UART_IER_RDI;
- up->port.read_status_mask |= UART_LSR_DR;
- serial_out(up, UART_IER, up->ier);
- }
-
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
}
static void serial_omap_stop_rx(struct uart_port *port)
{
struct uart_omap_port *up = to_uart_omap_port(port);
- pm_runtime_get_sync(up->dev);
up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
up->port.read_status_mask &= ~UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
+}
+
+static void serial_omap_put_char(struct uart_omap_port *up, unsigned char ch)
+{
+ serial_out(up, UART_TX, ch);
+
+ if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
+ !(up->port.rs485.flags & SER_RS485_RX_DURING_TX))
+ up->rs485_tx_filter_count++;
}
static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
@@ -366,7 +351,7 @@ static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
int count;
if (up->port.x_char) {
- serial_out(up, UART_TX, up->port.x_char);
+ serial_omap_put_char(up, up->port.x_char);
up->port.icount.tx++;
up->port.x_char = 0;
return;
@@ -377,9 +362,10 @@ static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
}
count = up->port.fifosize / 4;
do {
- serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+ serial_omap_put_char(up, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
up->port.icount.tx++;
+
if (uart_circ_empty(xmit))
break;
} while (--count > 0);
@@ -404,8 +390,6 @@ static void serial_omap_start_tx(struct uart_port *port)
struct uart_omap_port *up = to_uart_omap_port(port);
int res;
- pm_runtime_get_sync(up->dev);
-
/* Handle RS-485 */
if (port->rs485.flags & SER_RS485_ENABLED) {
/* Fire THR interrupts when FIFO is below trigger level */
@@ -414,8 +398,8 @@ static void serial_omap_start_tx(struct uart_port *port)
/* if rts not already enabled */
res = (port->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0;
- if (gpio_get_value(up->rts_gpio) != res) {
- gpio_set_value(up->rts_gpio, res);
+ if (gpiod_get_value(up->rts_gpiod) != res) {
+ gpiod_set_value(up->rts_gpiod, res);
if (port->rs485.delay_rts_before_send > 0)
mdelay(port->rs485.delay_rts_before_send);
}
@@ -423,11 +407,9 @@ static void serial_omap_start_tx(struct uart_port *port)
if ((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX))
- serial_omap_stop_rx(port);
+ up->rs485_tx_filter_count = 0;
serial_omap_enable_ier_thri(up);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
}
static void serial_omap_throttle(struct uart_port *port)
@@ -435,13 +417,10 @@ static void serial_omap_throttle(struct uart_port *port)
struct uart_omap_port *up = to_uart_omap_port(port);
unsigned long flags;
- pm_runtime_get_sync(up->dev);
spin_lock_irqsave(&up->port.lock, flags);
up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
serial_out(up, UART_IER, up->ier);
spin_unlock_irqrestore(&up->port.lock, flags);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
}
static void serial_omap_unthrottle(struct uart_port *port)
@@ -449,13 +428,10 @@ static void serial_omap_unthrottle(struct uart_port *port)
struct uart_omap_port *up = to_uart_omap_port(port);
unsigned long flags;
- pm_runtime_get_sync(up->dev);
spin_lock_irqsave(&up->port.lock, flags);
up->ier |= UART_IER_RLSI | UART_IER_RDI;
serial_out(up, UART_IER, up->ier);
spin_unlock_irqrestore(&up->port.lock, flags);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
}
static unsigned int check_modem_status(struct uart_omap_port *up)
@@ -494,8 +470,13 @@ static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
* Read one data character out to avoid stalling the receiver according
* to the table 23-246 of the omap4 TRM.
*/
- if (likely(lsr & UART_LSR_DR))
+ if (likely(lsr & UART_LSR_DR)) {
serial_in(up, UART_RX);
+ if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
+ !(up->port.rs485.flags & SER_RS485_RX_DURING_TX) &&
+ up->rs485_tx_filter_count)
+ up->rs485_tx_filter_count--;
+ }
up->port.icount.rx++;
flag = TTY_NORMAL;
@@ -546,6 +527,13 @@ static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
return;
ch = serial_in(up, UART_RX);
+ if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
+ !(up->port.rs485.flags & SER_RS485_RX_DURING_TX) &&
+ up->rs485_tx_filter_count) {
+ up->rs485_tx_filter_count--;
+ return;
+ }
+
flag = TTY_NORMAL;
up->port.icount.rx++;
@@ -569,7 +557,6 @@ static irqreturn_t serial_omap_irq(int irq, void *dev_id)
int max_count = 256;
spin_lock(&up->port.lock);
- pm_runtime_get_sync(up->dev);
do {
iir = serial_in(up, UART_IIR);
@@ -590,7 +577,6 @@ static irqreturn_t serial_omap_irq(int irq, void *dev_id)
transmit_chars(up, lsr);
break;
case UART_IIR_RX_TIMEOUT:
- /* FALLTHROUGH */
case UART_IIR_RDI:
serial_omap_rdi(up, lsr);
break;
@@ -601,7 +587,6 @@ static irqreturn_t serial_omap_irq(int irq, void *dev_id)
/* simply try again */
break;
case UART_IIR_XOFF:
- /* FALLTHROUGH */
default:
break;
}
@@ -611,8 +596,6 @@ static irqreturn_t serial_omap_irq(int irq, void *dev_id)
tty_flip_buffer_push(&up->port.state->port);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
up->port_activity = jiffies;
return ret;
@@ -621,16 +604,14 @@ static irqreturn_t serial_omap_irq(int irq, void *dev_id)
static unsigned int serial_omap_tx_empty(struct uart_port *port)
{
struct uart_omap_port *up = to_uart_omap_port(port);
- unsigned long flags = 0;
+ unsigned long flags;
unsigned int ret = 0;
- pm_runtime_get_sync(up->dev);
dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line);
spin_lock_irqsave(&up->port.lock, flags);
ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
spin_unlock_irqrestore(&up->port.lock, flags);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
+
return ret;
}
@@ -640,10 +621,7 @@ static unsigned int serial_omap_get_mctrl(struct uart_port *port)
unsigned int status;
unsigned int ret = 0;
- pm_runtime_get_sync(up->dev);
status = check_modem_status(up);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line);
@@ -675,7 +653,6 @@ static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
if (mctrl & TIOCM_LOOP)
mcr |= UART_MCR_LOOP;
- pm_runtime_get_sync(up->dev);
old_mcr = serial_in(up, UART_MCR);
old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 |
UART_MCR_DTR | UART_MCR_RTS);
@@ -691,18 +668,14 @@ static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
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);
}
static void serial_omap_break_ctl(struct uart_port *port, int break_state)
{
struct uart_omap_port *up = to_uart_omap_port(port);
- unsigned long flags = 0;
+ unsigned long flags;
dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line);
- pm_runtime_get_sync(up->dev);
spin_lock_irqsave(&up->port.lock, flags);
if (break_state == -1)
up->lcr |= UART_LCR_SBC;
@@ -710,14 +683,12 @@ static void serial_omap_break_ctl(struct uart_port *port, int break_state)
up->lcr &= ~UART_LCR_SBC;
serial_out(up, UART_LCR, up->lcr);
spin_unlock_irqrestore(&up->port.lock, flags);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
}
static int serial_omap_startup(struct uart_port *port)
{
struct uart_omap_port *up = to_uart_omap_port(port);
- unsigned long flags = 0;
+ unsigned long flags;
int retval;
/*
@@ -783,8 +754,6 @@ static int serial_omap_startup(struct uart_port *port)
serial_out(up, UART_OMAP_WER, up->wer);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
up->port_activity = jiffies;
return 0;
}
@@ -792,11 +761,10 @@ static int serial_omap_startup(struct uart_port *port)
static void serial_omap_shutdown(struct uart_port *port)
{
struct uart_omap_port *up = to_uart_omap_port(port);
- unsigned long flags = 0;
+ unsigned long flags;
dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line);
- pm_runtime_get_sync(up->dev);
/*
* Disable interrupts from this port
*/
@@ -820,8 +788,7 @@ static void serial_omap_shutdown(struct uart_port *port)
if (serial_in(up, UART_LSR) & UART_LSR_DR)
(void) serial_in(up, UART_RX);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
+ pm_runtime_put_sync(up->dev);
free_irq(up->port.irq, up);
dev_pm_clear_wake_irq(up->dev);
}
@@ -831,33 +798,19 @@ static void serial_omap_uart_qos_work(struct work_struct *work)
struct uart_omap_port *up = container_of(work, struct uart_omap_port,
qos_work);
- pm_qos_update_request(&up->pm_qos_request, up->latency);
+ cpu_latency_qos_update_request(&up->pm_qos_request, up->latency);
}
static void
serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
+ const struct ktermios *old)
{
struct uart_omap_port *up = to_uart_omap_port(port);
unsigned char cval = 0;
- unsigned long flags = 0;
+ unsigned long flags;
unsigned int baud, quot;
- switch (termios->c_cflag & CSIZE) {
- case CS5:
- cval = UART_LCR_WLEN5;
- break;
- case CS6:
- cval = UART_LCR_WLEN6;
- break;
- case CS7:
- cval = UART_LCR_WLEN7;
- break;
- default:
- case CS8:
- cval = UART_LCR_WLEN8;
- break;
- }
+ cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag));
if (termios->c_cflag & CSTOPB)
cval |= UART_LCR_STOP;
@@ -891,7 +844,6 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
* Ok, we're now changing the port state. Do it with
* interrupts disabled.
*/
- pm_runtime_get_sync(up->dev);
spin_lock_irqsave(&up->port.lock, flags);
/*
@@ -1091,8 +1043,6 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
serial_omap_set_mctrl(&up->port, up->port.mctrl);
spin_unlock_irqrestore(&up->port.lock, flags);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
}
@@ -1105,7 +1055,6 @@ serial_omap_pm(struct uart_port *port, unsigned int state,
dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line);
- pm_runtime_get_sync(up->dev);
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
efr = serial_in(up, UART_EFR);
serial_out(up, UART_EFR, efr | UART_EFR_ECB);
@@ -1115,9 +1064,6 @@ serial_omap_pm(struct uart_port *port, unsigned int state,
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
serial_out(up, UART_EFR, efr);
serial_out(up, UART_LCR, 0);
-
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
}
static void serial_omap_release_port(struct uart_port *port)
@@ -1158,8 +1104,6 @@ serial_omap_type(struct uart_port *port)
return up->name;
}
-#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
-
static void __maybe_unused wait_for_xmitr(struct uart_omap_port *up)
{
unsigned int status, tmout = 10000;
@@ -1174,7 +1118,7 @@ static void __maybe_unused wait_for_xmitr(struct uart_omap_port *up)
if (--tmout == 0)
break;
udelay(1);
- } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
+ } while (!uart_lsr_tx_empty(status));
/* Wait up to 1s for flow control if necessary */
if (up->port.flags & UPF_CONS_FLOW) {
@@ -1197,11 +1141,8 @@ static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
{
struct uart_omap_port *up = to_uart_omap_port(port);
- pm_runtime_get_sync(up->dev);
wait_for_xmitr(up);
serial_out(up, UART_TX, ch);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
}
static int serial_omap_poll_get_char(struct uart_port *port)
@@ -1209,7 +1150,6 @@ static int serial_omap_poll_get_char(struct uart_port *port)
struct uart_omap_port *up = to_uart_omap_port(port);
unsigned int status;
- pm_runtime_get_sync(up->dev);
status = serial_in(up, UART_LSR);
if (!(status & UART_LSR_DR)) {
status = NO_POLL_CHAR;
@@ -1219,9 +1159,6 @@ static int serial_omap_poll_get_char(struct uart_port *port)
status = serial_in(up, UART_RX);
out:
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
-
return status;
}
@@ -1243,13 +1180,13 @@ static void omap_serial_early_out(struct uart_port *port, int offset,
writew(value, port->membase + offset);
}
-static void omap_serial_early_putc(struct uart_port *port, int c)
+static void omap_serial_early_putc(struct uart_port *port, unsigned char c)
{
unsigned int status;
for (;;) {
status = omap_serial_early_in(port, UART_LSR);
- if ((status & BOTH_EMPTY) == BOTH_EMPTY)
+ if (uart_lsr_tx_empty(status))
break;
cpu_relax();
}
@@ -1287,7 +1224,7 @@ static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS];
static struct uart_driver serial_omap_reg;
-static void serial_omap_console_putchar(struct uart_port *port, int ch)
+static void serial_omap_console_putchar(struct uart_port *port, unsigned char ch)
{
struct uart_omap_port *up = to_uart_omap_port(port);
@@ -1304,8 +1241,6 @@ serial_omap_console_write(struct console *co, const char *s,
unsigned int ier;
int locked = 1;
- pm_runtime_get_sync(up->dev);
-
local_irq_save(flags);
if (up->port.sysrq)
locked = 0;
@@ -1338,8 +1273,6 @@ serial_omap_console_write(struct console *co, const char *s,
if (up->msr_saved_flags)
check_modem_status(up);
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
if (locked)
spin_unlock(&up->port.lock);
local_irq_restore(flags);
@@ -1392,38 +1325,23 @@ static inline void serial_omap_add_console_port(struct uart_omap_port *up)
/* Enable or disable the rs485 support */
static int
-serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
+serial_omap_config_rs485(struct uart_port *port, struct ktermios *termios,
+ struct serial_rs485 *rs485)
{
struct uart_omap_port *up = to_uart_omap_port(port);
unsigned int mode;
int val;
- pm_runtime_get_sync(up->dev);
-
/* Disable interrupts from this port */
mode = up->ier;
up->ier = 0;
serial_out(up, UART_IER, 0);
- /* Clamp the delays to [0, 100ms] */
- rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U);
- rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U);
-
- /* store new config */
- port->rs485 = *rs485;
-
- /*
- * Just as a precaution, only allow rs485
- * to be enabled if the gpio pin is valid
- */
- if (gpio_is_valid(up->rts_gpio)) {
- /* enable / disable rts */
- val = (port->rs485.flags & SER_RS485_ENABLED) ?
- SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
- val = (port->rs485.flags & val) ? 1 : 0;
- gpio_set_value(up->rts_gpio, val);
- } else
- port->rs485.flags &= ~SER_RS485_ENABLED;
+ /* enable / disable rts */
+ val = (rs485->flags & SER_RS485_ENABLED) ?
+ SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
+ val = (rs485->flags & val) ? 1 : 0;
+ gpiod_set_value(up->rts_gpiod, val);
/* Enable interrupts */
up->ier = mode;
@@ -1432,15 +1350,12 @@ serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
/* If RS-485 is disabled, make sure the THR interrupt is fired when
* TX FIFO is below the trigger level.
*/
- if (!(port->rs485.flags & SER_RS485_ENABLED) &&
+ if (!(rs485->flags & SER_RS485_ENABLED) &&
(up->scr & OMAP_UART_SCR_TX_EMPTY)) {
up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
serial_out(up, UART_OMAP_SCR, up->scr);
}
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
-
return 0;
}
@@ -1598,18 +1513,22 @@ static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
}
static int serial_omap_probe_rs485(struct uart_omap_port *up,
- struct device_node *np)
+ struct device *dev)
{
struct serial_rs485 *rs485conf = &up->port.rs485;
+ struct device_node *np = dev->of_node;
+ enum gpiod_flags gflags;
int ret;
rs485conf->flags = 0;
- up->rts_gpio = -EINVAL;
+ up->rts_gpiod = NULL;
if (!np)
return 0;
- uart_get_rs485_mode(up->dev, rs485conf);
+ ret = uart_get_rs485_mode(&up->port);
+ if (ret)
+ return ret;
if (of_property_read_bool(np, "rs485-rts-active-high")) {
rs485conf->flags |= SER_RS485_RTS_ON_SEND;
@@ -1620,24 +1539,34 @@ static int serial_omap_probe_rs485(struct uart_omap_port *up,
}
/* check for tx enable gpio */
- up->rts_gpio = of_get_named_gpio(np, "rts-gpio", 0);
- if (gpio_is_valid(up->rts_gpio)) {
- ret = devm_gpio_request(up->dev, up->rts_gpio, "omap-serial");
- if (ret < 0)
- return ret;
- ret = rs485conf->flags & SER_RS485_RTS_AFTER_SEND ? 1 : 0;
- ret = gpio_direction_output(up->rts_gpio, ret);
- if (ret < 0)
+ gflags = rs485conf->flags & SER_RS485_RTS_AFTER_SEND ?
+ GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
+ up->rts_gpiod = devm_gpiod_get_optional(dev, "rts", gflags);
+ if (IS_ERR(up->rts_gpiod)) {
+ ret = PTR_ERR(up->rts_gpiod);
+ if (ret == -EPROBE_DEFER)
return ret;
- } else if (up->rts_gpio == -EPROBE_DEFER) {
- return -EPROBE_DEFER;
+
+ up->rts_gpiod = NULL;
+ up->port.rs485_supported = (const struct serial_rs485) { };
+ if (rs485conf->flags & SER_RS485_ENABLED) {
+ dev_err(dev, "disabling RS-485 (rts-gpio missing in device tree)\n");
+ memset(rs485conf, 0, sizeof(*rs485conf));
+ }
} else {
- up->rts_gpio = -EINVAL;
+ gpiod_set_consumer_name(up->rts_gpiod, "omap-serial");
}
return 0;
}
+static const struct serial_rs485 serial_omap_rs485_supported = {
+ .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND |
+ SER_RS485_RX_DURING_TX,
+ .delay_rts_before_send = 1,
+ .delay_rts_after_send = 1,
+};
+
static int serial_omap_probe(struct platform_device *pdev)
{
struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
@@ -1705,7 +1634,7 @@ static int serial_omap_probe(struct platform_device *pdev)
dev_info(up->port.dev, "no wakeirq for uart%d\n",
up->port.line);
- ret = serial_omap_probe_rs485(up, pdev->dev.of_node);
+ ret = serial_omap_probe_rs485(up, &pdev->dev);
if (ret < 0)
goto err_rs485;
@@ -1715,6 +1644,7 @@ static int serial_omap_probe(struct platform_device *pdev)
up->port.flags = omap_up_info->flags;
up->port.uartclk = omap_up_info->uartclk;
up->port.rs485_config = serial_omap_config_rs485;
+ up->port.rs485_supported = serial_omap_rs485_supported;
if (!up->port.uartclk) {
up->port.uartclk = DEFAULT_CLK_SPEED;
dev_warn(&pdev->dev,
@@ -1722,10 +1652,9 @@ static int serial_omap_probe(struct platform_device *pdev)
DEFAULT_CLK_SPEED);
}
- up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
- up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
- pm_qos_add_request(&up->pm_qos_request,
- PM_QOS_CPU_DMA_LATENCY, up->latency);
+ up->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
+ up->calc_latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
+ cpu_latency_qos_add_request(&up->pm_qos_request, up->latency);
INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
platform_set_drvdata(pdev, up);
@@ -1733,11 +1662,7 @@ static int serial_omap_probe(struct platform_device *pdev)
omap_up_info->autosuspend_timeout = -1;
device_init_wakeup(up->dev, true);
- pm_runtime_use_autosuspend(&pdev->dev);
- pm_runtime_set_autosuspend_delay(&pdev->dev,
- omap_up_info->autosuspend_timeout);
- pm_runtime_irq_safe(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
@@ -1751,15 +1676,12 @@ static int serial_omap_probe(struct platform_device *pdev)
if (ret != 0)
goto err_add_port;
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
return 0;
err_add_port:
- pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
- pm_qos_remove_request(&up->pm_qos_request);
+ cpu_latency_qos_remove_request(&up->pm_qos_request);
device_init_wakeup(up->dev, false);
err_rs485:
err_port_line:
@@ -1774,10 +1696,9 @@ static int serial_omap_remove(struct platform_device *dev)
uart_remove_one_port(&serial_omap_reg, &up->port);
- pm_runtime_dont_use_autosuspend(up->dev);
pm_runtime_put_sync(up->dev);
pm_runtime_disable(up->dev);
- pm_qos_remove_request(&up->pm_qos_request);
+ cpu_latency_qos_remove_request(&up->pm_qos_request);
device_init_wakeup(&dev->dev, false);
return 0;
@@ -1869,7 +1790,7 @@ static int serial_omap_runtime_suspend(struct device *dev)
serial_omap_enable_wakeup(up, true);
- up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
+ up->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
schedule_work(&up->qos_work);
return 0;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.