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Commit 452fafed authored by Lars Poeschel's avatar Lars Poeschel Committed by Wim Van Sebroeck
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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: default avatarLars Poeschel <poeschel@lemonage.de>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 7a7cb009

drivers/watchdog/omap_wdt.c

+11 −0
Original line number Diff line number Diff line
@@ -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)

drivers/watchdog/omap_wdt.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */