linux-kernel - [PATCH 4/4] ARM: mpcore_wdt: Fix timer mode setup

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Date:	Mon,  4 Oct 2010 13:45:40 +0400
From:	vkuzmichev@...sta.com
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux@....linux.org.uk, Vitaly Kuzmichev <vkuzmichev@...sta.com>
Subject: [PATCH 4/4] ARM: mpcore_wdt: Fix timer mode setup

From: Vitaly Kuzmichev <vkuzmichev@...sta.com>

Allow watchdog to set its iterrupt as pending when it is configured
for timer mode.
Also add macros for all Watchdog Control Register flags.

Signed-off-by: Vitaly Kuzmichev <vkuzmichev@...sta.com>
---
 arch/arm/include/asm/smp_twd.h |    6 ++++++
 drivers/watchdog/mpcore_wdt.c  |   15 +++++++++++----
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/arch/arm/include/asm/smp_twd.h b/arch/arm/include/asm/smp_twd.h
index c6328d8..324bf0a 100644
--- a/arch/arm/include/asm/smp_twd.h
+++ b/arch/arm/include/asm/smp_twd.h
@@ -18,6 +18,12 @@
 #define TWD_TIMER_CONTROL_PERIODIC	(1 << 1)
 #define TWD_TIMER_CONTROL_IT_ENABLE	(1 << 2)
 
+#define TWD_WDOG_CONTROL_ENABLE		(1 << 0)
+#define TWD_WDOG_CONTROL_PERIODIC	(1 << 1)
+#define TWD_WDOG_CONTROL_IT_ENABLE	(1 << 2)
+#define TWD_WDOG_CONTROL_TIMER_MODE	(0 << 3)
+#define TWD_WDOG_CONTROL_WATCHDOG_MODE	(1 << 3)
+
 struct clock_event_device;
 
 extern void __iomem *twd_base;
diff --git a/drivers/watchdog/mpcore_wdt.c b/drivers/watchdog/mpcore_wdt.c
index 6d3ac06..07d5a1c 100644
--- a/drivers/watchdog/mpcore_wdt.c
+++ b/drivers/watchdog/mpcore_wdt.c
@@ -123,18 +123,25 @@ static void mpcore_wdt_stop(struct mpcore_wdt *wdt)
 
 static void mpcore_wdt_start(struct mpcore_wdt *wdt)
 {
+	u32 mode;
+
 	dev_printk(KERN_INFO, wdt->dev, "enabling watchdog.\n");
 
 	/* This loads the count register but does NOT start the count yet */
 	mpcore_wdt_keepalive(wdt);
 
+	/* Setup watchdog - prescale=256, enable=1 */
+	mode = (255 << 8) | TWD_WDOG_CONTROL_ENABLE;
+
 	if (mpcore_noboot) {
-		/* Enable watchdog - prescale=256, watchdog mode=0, enable=1 */
-		writel(0x0000FF01, wdt->base + TWD_WDOG_CONTROL);
+		/* timer mode, send interrupt */
+		mode |=	TWD_WDOG_CONTROL_TIMER_MODE
+		     |  TWD_WDOG_CONTROL_IT_ENABLE;
 	} else {
-		/* Enable watchdog - prescale=256, watchdog mode=1, enable=1 */
-		writel(0x0000FF09, wdt->base + TWD_WDOG_CONTROL);
+		/* watchdog mode */
+		mode |=	TWD_WDOG_CONTROL_WATCHDOG_MODE;
 	}
+	writel(mode, wdt->base + TWD_WDOG_CONTROL);
 }
 
 static int mpcore_wdt_set_heartbeat(int t)
-- 
1.7.2.2

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