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authorLars Poeschel <poeschel@lemonage.de>2015-06-17 10:58:59 +0200
committerWim Van Sebroeck <wim@iguana.be>2015-06-22 15:54:35 +0200
commit452fafed839eb008a8ed9072d63449cb76de617e (patch)
tree7960b3c8f0132c4b6f784f23b8c3ca87586062a2 /drivers/watchdog/omap_wdt.c
parent7a7cb009dcbae5588d8836cd7b4f7255db2e489b (diff)
downloadop-kernel-dev-452fafed839eb008a8ed9072d63449cb76de617e.zip
op-kernel-dev-452fafed839eb008a8ed9072d63449cb76de617e.tar.gz
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>
Diffstat (limited to 'drivers/watchdog/omap_wdt.c')
-rw-r--r--drivers/watchdog/omap_wdt.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
index 1a74bc7..ebea6e6 100644
--- a/drivers/watchdog/omap_wdt.c
+++ b/drivers/watchdog/omap_wdt.c
@@ -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)
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