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watchdog: omap_wdt: implement get_timeleft 

The omap watchdog hardware is able to read the watchdog timer counter
register. This implements this functionality in the omap_wdt driver, so
one is can read the time until the watchdog will trigger the reset in
seconds using WDIOC_GETTIMELEFT.

Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Lars Poeschel 2015-06-17 10:58:59 +02:00 committed by Wim Van Sebroeck
parent 7a7cb009dc
commit 452fafed83
2 changed files with 12 additions and 0 deletions
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11
drivers/watchdog/omap_wdt.c
View File

@ -198,6 +198,16 @@ static int omap_wdt_set_timeout(struct watchdog_device *wdog,
return 0;
}
static unsigned int omap_wdt_get_timeleft(struct watchdog_device *wdog)
{
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
void __iomem *base = wdev->base;
u32 value;
value = readl_relaxed(base + OMAP_WATCHDOG_CRR);
return GET_WCCR_SECS(value);
}
static const struct watchdog_info omap_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
.identity = "OMAP Watchdog",
@ -209,6 +219,7 @@ static const struct watchdog_ops omap_wdt_ops = {
.stop = omap_wdt_stop,
.ping = omap_wdt_ping,
.set_timeout = omap_wdt_set_timeout,
.get_timeleft = omap_wdt_get_timeleft,
};
static int omap_wdt_probe(struct platform_device *pdev)

1
drivers/watchdog/omap_wdt.h
View File

@ -50,5 +50,6 @@
#define PTV 0 /* prescale */
#define GET_WLDR_VAL(secs) (0xffffffff - ((secs) * (32768/(1<<PTV))) + 1)
#define GET_WCCR_SECS(val) ((0xffffffff - (val) + 1) / (32768/(1<<PTV)))
#endif /* _OMAP_WATCHDOG_H */