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watchdog: s3c2410: add restart handler

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On a lot of Samsung systems the watchdog is responsible for restarting the
system and until now this code was contained in plat-samsung/watchdog-reset.c.

With the introduction of the restart handlers, this code can now move into
driver itself, removing the need for arch-specific code.

Tested on a S3C2442 based GTA02

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Heiko Stuebner 2014-08-19 17:45:36 -07:00 committed by Wim Van Sebroeck
parent 31228f43ab
commit f286e1335f
1 changed files with 36 additions and 0 deletions
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36
drivers/watchdog/s3c2410_wdt.c
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@ -41,6 +41,8 @@
#include <linux/of.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#define S3C2410_WTCON 0x00
#define S3C2410_WTDAT 0x04
@ -128,6 +130,7 @@ struct s3c2410_wdt {
unsigned long wtdat_save;
struct watchdog_device wdt_device;
struct notifier_block freq_transition;
struct notifier_block restart_handler;
struct s3c2410_wdt_variant *drv_data;
struct regmap *pmureg;
};
@ -449,6 +452,31 @@ static inline void s3c2410wdt_cpufreq_deregister(struct s3c2410_wdt *wdt)
}
#endif
static int s3c2410wdt_restart(struct notifier_block *this,
unsigned long mode, void *cmd)
{
struct s3c2410_wdt *wdt = container_of(this, struct s3c2410_wdt,
restart_handler);
void __iomem *wdt_base = wdt->reg_base;
/* disable watchdog, to be safe */
writel(0, wdt_base + S3C2410_WTCON);
/* put initial values into count and data */
writel(0x80, wdt_base + S3C2410_WTCNT);
writel(0x80, wdt_base + S3C2410_WTDAT);
/* set the watchdog to go and reset... */
writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV16 |
S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x20),
wdt_base + S3C2410_WTCON);
/* wait for reset to assert... */
mdelay(500);
return NOTIFY_DONE;
}
static inline unsigned int s3c2410wdt_get_bootstatus(struct s3c2410_wdt *wdt)
{
unsigned int rst_stat;
@ -603,6 +631,12 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, wdt);
wdt->restart_handler.notifier_call = s3c2410wdt_restart;
wdt->restart_handler.priority = 128;
ret = register_restart_handler(&wdt->restart_handler);
if (ret)
pr_err("cannot register restart handler, %d\n", ret);
/* print out a statement of readiness */
wtcon = readl(wdt->reg_base + S3C2410_WTCON);
@ -632,6 +666,8 @@ static int s3c2410wdt_remove(struct platform_device *dev)
int ret;
struct s3c2410_wdt *wdt = platform_get_drvdata(dev);
unregister_restart_handler(&wdt->restart_handler);
ret = s3c2410wdt_mask_and_disable_reset(wdt, true);
if (ret < 0)
return ret;