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watchdog: sp805: add restart handler

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Add restart handler for SP805 watchdog so that the driver can be
used to reboot the system.

Signed-off-by: Jongsung Kim <neidhard.kim@lge.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Jongsung Kim 2018-05-04 15:05:03 +09:00 committed by Wim Van Sebroeck
parent 665f94423a
commit 6c5c0d48b6
1 changed files with 14 additions and 0 deletions
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14
drivers/watchdog/sp805_wdt.c
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@ -121,6 +121,18 @@ static unsigned int wdt_timeleft(struct watchdog_device *wdd)
return div_u64(load, rate);
}
static int
wdt_restart(struct watchdog_device *wdd, unsigned long mode, void *cmd)
{
struct sp805_wdt *wdt = watchdog_get_drvdata(wdd);
writel_relaxed(0, wdt->base + WDTCONTROL);
writel_relaxed(0, wdt->base + WDTLOAD);
writel_relaxed(INT_ENABLE | RESET_ENABLE, wdt->base + WDTCONTROL);
return 0;
}
static int wdt_config(struct watchdog_device *wdd, bool ping)
{
struct sp805_wdt *wdt = watchdog_get_drvdata(wdd);
@ -197,6 +209,7 @@ static const struct watchdog_ops wdt_ops = {
.ping = wdt_ping,
.set_timeout = wdt_setload,
.get_timeleft = wdt_timeleft,
.restart = wdt_restart,
};
static int
@ -230,6 +243,7 @@ sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id)
spin_lock_init(&wdt->lock);
watchdog_set_nowayout(&wdt->wdd, nowayout);
watchdog_set_drvdata(&wdt->wdd, wdt);
watchdog_set_restart_priority(&wdt->wdd, 128);
wdt_setload(&wdt->wdd, DEFAULT_TIMEOUT);
ret = watchdog_register_device(&wdt->wdd);