redonkable/remarkable-linux
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[WATCHDOG] davinci: use clock framework for timer frequency

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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>
This commit is contained in:
Kevin Hilman 2009-02-10 20:30:37 -08:00 committed by Wim Van Sebroeck
parent 0ecc3bf47b
commit 9fd868f440
1 changed files with 17 additions and 2 deletions
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19
drivers/watchdog/davinci_wdt.c
View file

@ -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;
}