From: Lars Poeschel <[email protected]> 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 <[email protected]> --- drivers/watchdog/omap_wdt.c | 11 +++++++++++ drivers/watchdog/omap_wdt.h | 1 + 2 files changed, 12 insertions(+) diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c index 1e6be9e..2480a27 100644 --- a/drivers/watchdog/omap_wdt.c +++ b/drivers/watchdog/omap_wdt.c @@ -188,6 +188,16 @@ 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", @@ -199,6 +209,7 @@ 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) diff --git a/drivers/watchdog/omap_wdt.h b/drivers/watchdog/omap_wdt.h index 09b774c..42f31ec 100644 --- a/drivers/watchdog/omap_wdt.h +++ b/drivers/watchdog/omap_wdt.h @@ -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 */ -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
