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authorKevin Hilman <khilman@deeprootsystems.com>2009-02-10 20:30:37 -0800
committerWim Van Sebroeck <wim@iguana.be>2009-09-18 08:37:01 +0000
commit9fd868f440c3d722199a14200b2a64a0a5e70221 (patch)
tree395a15115f6abd320158cc8b4a21dd04b2501ff5 /drivers/watchdog/davinci_wdt.c
parent0ecc3bf47b09de24c6b1163ba6558448aadd31ce (diff)
downloadvexpress-lsk-9fd868f440c3d722199a14200b2a64a0a5e70221.tar.gz
[WATCHDOG] davinci: use clock framework for timer frequency
Remove use of CLOCK_TICK_RATE in favor of using clock framework for getting timer frequency. Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com> Signed-off-by: Russell King <linux@arm.linux.org.uk> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog/davinci_wdt.c')
-rw-r--r--drivers/watchdog/davinci_wdt.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
index 83e22e7ea4a..9d7520fa9e9 100644
--- a/drivers/watchdog/davinci_wdt.c
+++ b/drivers/watchdog/davinci_wdt.c
@@ -25,6 +25,7 @@
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/device.h>
+#include <linux/clk.h>
#define MODULE_NAME "DAVINCI-WDT: "
@@ -69,6 +70,7 @@ static unsigned long wdt_status;
static struct resource *wdt_mem;
static void __iomem *wdt_base;
+struct clk *wdt_clk;
static void wdt_service(void)
{
@@ -86,6 +88,9 @@ static void wdt_enable(void)
{
u32 tgcr;
u32 timer_margin;
+ unsigned long wdt_freq;
+
+ wdt_freq = clk_get_rate(wdt_clk);
spin_lock(&io_lock);
@@ -99,9 +104,9 @@ static void wdt_enable(void)
iowrite32(0, wdt_base + TIM12);
iowrite32(0, wdt_base + TIM34);
/* set timeout period */
- timer_margin = (((u64)heartbeat * CLOCK_TICK_RATE) & 0xffffffff);
+ timer_margin = (((u64)heartbeat * wdt_freq) & 0xffffffff);
iowrite32(timer_margin, wdt_base + PRD12);
- timer_margin = (((u64)heartbeat * CLOCK_TICK_RATE) >> 32);
+ timer_margin = (((u64)heartbeat * wdt_freq) >> 32);
iowrite32(timer_margin, wdt_base + PRD34);
/* enable run continuously */
iowrite32(ENAMODE12_PERIODIC, wdt_base + TCR);
@@ -199,6 +204,12 @@ static int __devinit davinci_wdt_probe(struct platform_device *pdev)
struct resource *res;
struct device *dev = &pdev->dev;
+ wdt_clk = clk_get(dev, NULL);
+ if (WARN_ON(IS_ERR(wdt_clk)))
+ return PTR_ERR(wdt_clk);
+
+ clk_enable(wdt_clk);
+
if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
heartbeat = DEFAULT_HEARTBEAT;
@@ -245,6 +256,10 @@ static int __devexit davinci_wdt_remove(struct platform_device *pdev)
kfree(wdt_mem);
wdt_mem = NULL;
}
+
+ clk_disable(wdt_clk);
+ clk_put(wdt_clk);
+
return 0;
}