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Diffstat (limited to 'drivers/tty/serial/sh-sci.c')
-rw-r--r--drivers/tty/serial/sh-sci.c103
1 files changed, 68 insertions, 35 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 784dd42002ea..31fcc7072a90 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* SuperH on-chip serial module support. (SCI with no FIFO / with FIFO)
*
@@ -13,10 +14,6 @@
* Modified to support SecureEdge. David McCullough (2002)
* Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003).
* Removed SH7300 support (Jul 2007).
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
*/
#if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
@@ -40,6 +37,7 @@
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/scatterlist.h>
@@ -152,6 +150,7 @@ struct sci_port {
int rx_trigger;
struct timer_list rx_fifo_timer;
int rx_fifo_timeout;
+ u16 hscif_tot;
bool has_rtscts;
bool autorts;
@@ -1107,8 +1106,14 @@ static ssize_t rx_fifo_timeout_show(struct device *dev,
{
struct uart_port *port = dev_get_drvdata(dev);
struct sci_port *sci = to_sci_port(port);
+ int v;
+
+ if (port->type == PORT_HSCIF)
+ v = sci->hscif_tot >> HSSCR_TOT_SHIFT;
+ else
+ v = sci->rx_fifo_timeout;
- return sprintf(buf, "%d\n", sci->rx_fifo_timeout);
+ return sprintf(buf, "%d\n", v);
}
static ssize_t rx_fifo_timeout_store(struct device *dev,
@@ -1124,11 +1129,19 @@ static ssize_t rx_fifo_timeout_store(struct device *dev,
ret = kstrtol(buf, 0, &r);
if (ret)
return ret;
- sci->rx_fifo_timeout = r;
- scif_set_rtrg(port, 1);
- if (r > 0)
- setup_timer(&sci->rx_fifo_timer, rx_fifo_timer_fn,
- (unsigned long)sci);
+
+ if (port->type == PORT_HSCIF) {
+ if (r < 0 || r > 3)
+ return -EINVAL;
+ sci->hscif_tot = r << HSSCR_TOT_SHIFT;
+ } else {
+ sci->rx_fifo_timeout = r;
+ scif_set_rtrg(port, 1);
+ if (r > 0)
+ setup_timer(&sci->rx_fifo_timer, rx_fifo_timer_fn,
+ (unsigned long)sci);
+ }
+
return count;
}
@@ -1210,8 +1223,11 @@ static void sci_rx_dma_release(struct sci_port *s, bool enable_pio)
dma_free_coherent(chan->device->dev, s->buf_len_rx * 2, s->rx_buf[0],
sg_dma_address(&s->sg_rx[0]));
dma_release_channel(chan);
- if (enable_pio)
+ if (enable_pio) {
+ spin_lock_irqsave(&port->lock, flags);
sci_start_rx(port);
+ spin_unlock_irqrestore(&port->lock, flags);
+ }
}
static void sci_dma_rx_complete(void *arg)
@@ -1278,8 +1294,11 @@ static void sci_tx_dma_release(struct sci_port *s, bool enable_pio)
dma_unmap_single(chan->device->dev, s->tx_dma_addr, UART_XMIT_SIZE,
DMA_TO_DEVICE);
dma_release_channel(chan);
- if (enable_pio)
+ if (enable_pio) {
+ spin_lock_irqsave(&port->lock, flags);
sci_start_tx(port);
+ spin_unlock_irqrestore(&port->lock, flags);
+ }
}
static void sci_submit_rx(struct sci_port *s)
@@ -1491,6 +1510,14 @@ static void sci_request_dma(struct uart_port *port)
return;
s->cookie_tx = -EINVAL;
+
+ /*
+ * Don't request a dma channel if no channel was specified
+ * in the device tree.
+ */
+ if (!of_find_property(port->dev->of_node, "dmas", NULL))
+ return;
+
chan = sci_request_dma_chan(port, DMA_MEM_TO_DEV);
dev_dbg(port->dev, "%s: TX: got channel %p\n", __func__, chan);
if (chan) {
@@ -1980,6 +2007,7 @@ static void sci_enable_ms(struct uart_port *port)
static void sci_break_ctl(struct uart_port *port, int break_state)
{
unsigned short scscr, scsptr;
+ unsigned long flags;
/* check wheter the port has SCSPTR */
if (!sci_getreg(port, SCSPTR)->size) {
@@ -1990,6 +2018,7 @@ static void sci_break_ctl(struct uart_port *port, int break_state)
return;
}
+ spin_lock_irqsave(&port->lock, flags);
scsptr = serial_port_in(port, SCSPTR);
scscr = serial_port_in(port, SCSCR);
@@ -2003,6 +2032,7 @@ static void sci_break_ctl(struct uart_port *port, int break_state)
serial_port_out(port, SCSPTR, scsptr);
serial_port_out(port, SCSCR, scscr);
+ spin_unlock_irqrestore(&port->lock, flags);
}
static int sci_startup(struct uart_port *port)
@@ -2037,9 +2067,13 @@ static void sci_shutdown(struct uart_port *port)
spin_lock_irqsave(&port->lock, flags);
sci_stop_rx(port);
sci_stop_tx(port);
- /* Stop RX and TX, disable related interrupts, keep clock source */
+ /*
+ * Stop RX and TX, disable related interrupts, keep clock source
+ * and HSCIF TOT bits
+ */
scr = serial_port_in(port, SCSCR);
- serial_port_out(port, SCSCR, scr & (SCSCR_CKE1 | SCSCR_CKE0));
+ serial_port_out(port, SCSCR, scr &
+ (SCSCR_CKE1 | SCSCR_CKE0 | s->hscif_tot));
spin_unlock_irqrestore(&port->lock, flags);
#ifdef CONFIG_SERIAL_SH_SCI_DMA
@@ -2186,7 +2220,7 @@ static void sci_reset(struct uart_port *port)
unsigned int status;
struct sci_port *s = to_sci_port(port);
- serial_port_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
+ serial_port_out(port, SCSCR, s->hscif_tot); /* TE=0, RE=0, CKE1=0 */
reg = sci_getreg(port, SCFCR);
if (reg->size)
@@ -2227,6 +2261,7 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
int min_err = INT_MAX, err;
unsigned long max_freq = 0;
int best_clk = -1;
+ unsigned long flags;
if ((termios->c_cflag & CSIZE) == CS7)
smr_val |= SCSMR_CHR;
@@ -2336,6 +2371,8 @@ done:
serial_port_out(port, SCCKS, sccks);
}
+ spin_lock_irqsave(&port->lock, flags);
+
sci_reset(port);
uart_update_timeout(port, termios->c_cflag, baud);
@@ -2353,10 +2390,7 @@ done:
case 27: smr_val |= SCSMR_SRC_27; break;
}
smr_val |= cks;
- dev_dbg(port->dev,
- "SCR 0x%x SMR 0x%x BRR %u CKS 0x%x DL %u SRR %u\n",
- scr_val, smr_val, brr, sccks, dl, srr);
- serial_port_out(port, SCSCR, scr_val);
+ serial_port_out(port, SCSCR, scr_val | s->hscif_tot);
serial_port_out(port, SCSMR, smr_val);
serial_port_out(port, SCBRR, brr);
if (sci_getreg(port, HSSRR)->size)
@@ -2369,8 +2403,7 @@ done:
scr_val = s->cfg->scscr & (SCSCR_CKE1 | SCSCR_CKE0);
smr_val |= serial_port_in(port, SCSMR) &
(SCSMR_CKEDG | SCSMR_SRC_MASK | SCSMR_CKS);
- dev_dbg(port->dev, "SCR 0x%x SMR 0x%x\n", scr_val, smr_val);
- serial_port_out(port, SCSCR, scr_val);
+ serial_port_out(port, SCSCR, scr_val | s->hscif_tot);
serial_port_out(port, SCSMR, smr_val);
}
@@ -2406,8 +2439,7 @@ done:
scr_val |= SCSCR_RE | SCSCR_TE |
(s->cfg->scscr & ~(SCSCR_CKE1 | SCSCR_CKE0));
- dev_dbg(port->dev, "SCSCR 0x%x\n", scr_val);
- serial_port_out(port, SCSCR, scr_val);
+ serial_port_out(port, SCSCR, scr_val | s->hscif_tot);
if ((srr + 1 == 5) &&
(port->type == PORT_SCIFA || port->type == PORT_SCIFB)) {
/*
@@ -2453,8 +2485,6 @@ done:
s->rx_frame = (100 * bits * HZ) / (baud / 10);
#ifdef CONFIG_SERIAL_SH_SCI_DMA
s->rx_timeout = DIV_ROUND_UP(s->buf_len_rx * 2 * s->rx_frame, 1000);
- dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n",
- s->rx_timeout * 1000 / HZ, port->timeout);
if (s->rx_timeout < msecs_to_jiffies(20))
s->rx_timeout = msecs_to_jiffies(20);
#endif
@@ -2462,6 +2492,8 @@ done:
if ((termios->c_cflag & CREAD) != 0)
sci_start_rx(port);
+ spin_unlock_irqrestore(&port->lock, flags);
+
sci_port_disable(s);
if (UART_ENABLE_MS(port, termios->c_cflag))
@@ -2773,6 +2805,7 @@ static int sci_init_single(struct platform_device *dev,
}
sci_port->rx_fifo_timeout = 0;
+ sci_port->hscif_tot = 0;
/* SCIFA on sh7723 and sh7724 need a custom sampling rate that doesn't
* match the SoC datasheet, this should be investigated. Let platform
@@ -2860,7 +2893,7 @@ static void serial_console_write(struct console *co, const char *s,
ctrl_temp = SCSCR_RE | SCSCR_TE |
(sci_port->cfg->scscr & ~(SCSCR_CKE1 | SCSCR_CKE0)) |
(ctrl & (SCSCR_CKE1 | SCSCR_CKE0));
- serial_port_out(port, SCSCR, ctrl_temp);
+ serial_port_out(port, SCSCR, ctrl_temp | sci_port->hscif_tot);
uart_console_write(port, s, count, serial_console_putchar);
@@ -2988,7 +3021,8 @@ static int sci_remove(struct platform_device *dev)
sysfs_remove_file(&dev->dev.kobj,
&dev_attr_rx_fifo_trigger.attr);
}
- if (port->port.type == PORT_SCIFA || port->port.type == PORT_SCIFB) {
+ if (port->port.type == PORT_SCIFA || port->port.type == PORT_SCIFB ||
+ port->port.type == PORT_HSCIF) {
sysfs_remove_file(&dev->dev.kobj,
&dev_attr_rx_fifo_timeout.attr);
}
@@ -3044,17 +3078,15 @@ static struct plat_sci_port *sci_parse_dt(struct platform_device *pdev,
unsigned int *dev_id)
{
struct device_node *np = pdev->dev.of_node;
- const struct of_device_id *match;
struct plat_sci_port *p;
struct sci_port *sp;
+ const void *data;
int id;
if (!IS_ENABLED(CONFIG_OF) || !np)
return NULL;
- match = of_match_node(of_sci_match, np);
- if (!match)
- return NULL;
+ data = of_device_get_match_data(&pdev->dev);
p = devm_kzalloc(&pdev->dev, sizeof(struct plat_sci_port), GFP_KERNEL);
if (!p)
@@ -3070,8 +3102,8 @@ static struct plat_sci_port *sci_parse_dt(struct platform_device *pdev,
sp = &sci_ports[id];
*dev_id = id;
- p->type = SCI_OF_TYPE(match->data);
- p->regtype = SCI_OF_REGTYPE(match->data);
+ p->type = SCI_OF_TYPE(data);
+ p->regtype = SCI_OF_REGTYPE(data);
sp->has_rtscts = of_property_read_bool(np, "uart-has-rtscts");
@@ -3173,7 +3205,8 @@ static int sci_probe(struct platform_device *dev)
if (ret)
return ret;
}
- if (sp->port.type == PORT_SCIFA || sp->port.type == PORT_SCIFB) {
+ if (sp->port.type == PORT_SCIFA || sp->port.type == PORT_SCIFB ||
+ sp->port.type == PORT_HSCIF) {
ret = sysfs_create_file(&dev->dev.kobj,
&dev_attr_rx_fifo_timeout.attr);
if (ret) {
@@ -3244,7 +3277,7 @@ early_platform_init_buffer("earlyprintk", &sci_driver,
early_serial_buf, ARRAY_SIZE(early_serial_buf));
#endif
#ifdef CONFIG_SERIAL_SH_SCI_EARLYCON
-static struct __init plat_sci_port port_cfg;
+static struct plat_sci_port port_cfg __initdata;
static int __init early_console_setup(struct earlycon_device *device,
int type)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.