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path: root/drivers/tty/serial/samsung.c
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Diffstat (limited to 'drivers/tty/serial/samsung.c')
-rw-r--r--drivers/tty/serial/samsung.c77
1 files changed, 68 insertions, 9 deletions
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 2769a38d15b..0c8a9fa2be6 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -39,6 +39,7 @@
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
+#include <linux/serial_s3c.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/cpufreq.h>
@@ -46,10 +47,9 @@
#include <asm/irq.h>
-#include <mach/hardware.h>
-
-#include <plat/regs-serial.h>
+#ifdef CONFIG_SAMSUNG_CLOCK
#include <plat/clock.h>
+#endif
#include "samsung.h"
@@ -446,6 +446,8 @@ static void s3c24xx_serial_shutdown(struct uart_port *port)
/* Clear pending interrupts and mask all interrupts */
if (s3c24xx_serial_has_interrupt_mask(port)) {
+ free_irq(port->irq, ourport);
+
wr_regl(port, S3C64XX_UINTP, 0xf);
wr_regl(port, S3C64XX_UINTM, 0xf);
}
@@ -505,6 +507,8 @@ static int s3c64xx_serial_startup(struct uart_port *port)
dbg("s3c64xx_serial_startup: port=%p (%08lx,%p)\n",
port->mapbase, port->membase);
+ wr_regl(port, S3C64XX_UINTM, 0xf);
+
ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
s3c24xx_serial_portname(port), ourport);
if (ret) {
@@ -894,7 +898,7 @@ console_initcall(s3c24xx_serial_console_init);
#define S3C24XX_SERIAL_CONSOLE NULL
#endif
-#ifdef CONFIG_CONSOLE_POLL
+#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
static int s3c24xx_serial_get_poll_char(struct uart_port *port);
static void s3c24xx_serial_put_poll_char(struct uart_port *port,
unsigned char c);
@@ -918,7 +922,7 @@ static struct uart_ops s3c24xx_serial_ops = {
.request_port = s3c24xx_serial_request_port,
.config_port = s3c24xx_serial_config_port,
.verify_port = s3c24xx_serial_verify_port,
-#ifdef CONFIG_CONSOLE_POLL
+#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
.poll_get_char = s3c24xx_serial_get_poll_char,
.poll_put_char = s3c24xx_serial_put_poll_char,
#endif
@@ -1162,6 +1166,18 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
ourport->tx_irq = ret;
ourport->clk = clk_get(&platdev->dev, "uart");
+ if (IS_ERR(ourport->clk)) {
+ pr_err("%s: Controller clock not found\n",
+ dev_name(&platdev->dev));
+ return PTR_ERR(ourport->clk);
+ }
+
+ ret = clk_prepare_enable(ourport->clk);
+ if (ret) {
+ pr_err("uart: clock failed to prepare+enable: %d\n", ret);
+ clk_put(ourport->clk);
+ return ret;
+ }
/* Keep all interrupts masked and cleared */
if (s3c24xx_serial_has_interrupt_mask(port)) {
@@ -1176,9 +1192,11 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
/* reset the fifos (and setup the uart) */
s3c24xx_serial_resetport(port, cfg);
+ clk_disable_unprepare(ourport->clk);
return 0;
}
+#ifdef CONFIG_SAMSUNG_CLOCK
static ssize_t s3c24xx_serial_show_clksrc(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -1194,7 +1212,7 @@ static ssize_t s3c24xx_serial_show_clksrc(struct device *dev,
}
static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL);
-
+#endif
/* Device driver serial port probe */
@@ -1252,9 +1270,11 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
platform_set_drvdata(pdev, &ourport->port);
+#ifdef CONFIG_SAMSUNG_CLOCK
ret = device_create_file(&pdev->dev, &dev_attr_clock_source);
if (ret < 0)
dev_err(&pdev->dev, "failed to add clock source attr.\n");
+#endif
ret = s3c24xx_serial_cpufreq_register(ourport);
if (ret < 0)
@@ -1272,7 +1292,9 @@ static int s3c24xx_serial_remove(struct platform_device *dev)
if (port) {
s3c24xx_serial_cpufreq_deregister(to_ourport(port));
+#ifdef CONFIG_SAMSUNG_CLOCK
device_remove_file(&dev->dev, &dev_attr_clock_source);
+#endif
uart_remove_one_port(&s3c24xx_uart_drv, port);
}
@@ -1307,9 +1329,29 @@ static int s3c24xx_serial_resume(struct device *dev)
return 0;
}
+static int s3c24xx_serial_resume_noirq(struct device *dev)
+{
+ struct uart_port *port = s3c24xx_dev_to_port(dev);
+
+ if (port) {
+ /* restore IRQ mask */
+ if (s3c24xx_serial_has_interrupt_mask(port)) {
+ unsigned int uintm = 0xf;
+ if (tx_enabled(port))
+ uintm &= ~S3C64XX_UINTM_TXD_MSK;
+ if (rx_enabled(port))
+ uintm &= ~S3C64XX_UINTM_RXD_MSK;
+ wr_regl(port, S3C64XX_UINTM, uintm);
+ }
+ }
+
+ return 0;
+}
+
static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
.suspend = s3c24xx_serial_suspend,
.resume = s3c24xx_serial_resume,
+ .resume_noirq = s3c24xx_serial_resume_noirq,
};
#define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops)
@@ -1343,6 +1385,13 @@ s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
}
+static bool
+s3c24xx_port_configured(unsigned int ucon)
+{
+ /* consider the serial port configured if the tx/rx mode set */
+ return (ucon & 0xf) != 0;
+}
+
#ifdef CONFIG_CONSOLE_POLL
/*
* Console polling routines for writing and reading from the uart while
@@ -1365,6 +1414,11 @@ static void s3c24xx_serial_put_poll_char(struct uart_port *port,
unsigned char c)
{
unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
+ unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
+
+ /* not possible to xmit on unconfigured port */
+ if (!s3c24xx_port_configured(ucon))
+ return;
while (!s3c24xx_serial_console_txrdy(port, ufcon))
cpu_relax();
@@ -1377,6 +1431,12 @@ static void
s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
{
unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
+ unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
+
+ /* not possible to xmit on unconfigured port */
+ if (!s3c24xx_port_configured(ucon))
+ return;
+
while (!s3c24xx_serial_console_txrdy(port, ufcon))
barrier();
wr_regb(cons_uart, S3C2410_UTXH, ch);
@@ -1409,9 +1469,7 @@ s3c24xx_serial_get_options(struct uart_port *port, int *baud,
"registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
port, ulcon, ucon, ubrdiv);
- if ((ucon & 0xf) != 0) {
- /* consider the serial port configured if the tx/rx mode set */
-
+ if (s3c24xx_port_configured(ucon)) {
switch (ulcon & S3C2410_LCON_CSMASK) {
case S3C2410_LCON_CS5:
*bits = 5;
@@ -1758,6 +1816,7 @@ static int __init s3c24xx_serial_modinit(void)
static void __exit s3c24xx_serial_modexit(void)
{
+ platform_driver_unregister(&samsung_serial_driver);
uart_unregister_driver(&s3c24xx_uart_drv);
}