[PATCH V3 10/14] watchdog/mpcore_wdt: Add support for WDIOC_GETBOOTSTATUS IOCTL

[Viresh Kumar]

mpcore watchdog can give last boot status, whether we got a watchdog reset or
not, via bit 0 of TWD_WDOG_RESETSTAT register. This patch adds support to return
correct status if WDIOC_GETBOOTSTATUS cmd is called with ioctl.

Signed-off-by: Viresh Kumar <viresh.kumar at linaro.org>
---
 arch/arm/include/asm/smp_twd.h | 2 ++
 drivers/watchdog/mpcore_wdt.c  | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/arch/arm/include/asm/smp_twd.h b/arch/arm/include/asm/smp_twd.h
index 7b2899c..a62bcfa 100644
--- a/arch/arm/include/asm/smp_twd.h
+++ b/arch/arm/include/asm/smp_twd.h
@@ -18,6 +18,8 @@
 #define TWD_TIMER_CONTROL_PERIODIC	(1 << 1)
 #define TWD_TIMER_CONTROL_IT_ENABLE	(1 << 2)
 
+#define TWD_WDOG_RESETSTAT_MASK		0x1
+
 #include <linux/ioport.h>
 
 struct twd_local_timer {
diff --git a/drivers/watchdog/mpcore_wdt.c b/drivers/watchdog/mpcore_wdt.c
index d8917ad..43f749d 100644
--- a/drivers/watchdog/mpcore_wdt.c
+++ b/drivers/watchdog/mpcore_wdt.c
@@ -151,6 +151,7 @@ static int mpcore_wdt_set_heartbeat(struct watchdog_device *wdd, unsigned int t)
 static const struct watchdog_info mpcore_wdt_info = {
 	.options		= WDIOF_SETTIMEOUT |
 				  WDIOF_KEEPALIVEPING |
+				  WDIOF_CARDRESET |
 				  WDIOF_MAGICCLOSE,
 	.identity		= "MPcore Watchdog",
 };
@@ -216,6 +217,9 @@ static int mpcore_wdt_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, wdt);
 	watchdog_set_drvdata(&wdt->wdd, wdt);
 
+	wdt->wdd.bootstatus = (readl_relaxed(wdt->base + TWD_WDOG_RESETSTAT) &
+			TWD_WDOG_RESETSTAT_MASK) ? WDIOF_CARDRESET : 0;
+
 	mpcore_wdt_stop(&wdt->wdd);
 
 	ret = watchdog_register_device(&wdt->wdd);
-- 
1.7.12.rc2.18.g61b472e