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--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -188,7 +188,7 @@ config SA1100_WATCHDOG
config MPCORE_WATCHDOG
tristate "MPcore watchdog"
- depends on HAVE_ARM_TWD
+ depends on ARCH_CNS3XXX
help
Watchdog timer embedded into the MPcore system.
--- a/drivers/watchdog/mpcore_wdt.c
+++ b/drivers/watchdog/mpcore_wdt.c
@@ -32,11 +32,14 @@
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/delay.h>
#include <asm/smp_twd.h>
struct mpcore_wdt {
unsigned long timer_alive;
+ unsigned long timer_rate;
struct device *dev;
void __iomem *base;
int irq;
@@ -98,14 +101,12 @@ static void mpcore_wdt_keepalive(struct
unsigned long count;
spin_lock(&wdt_lock);
- /* Assume prescale is set to 256 */
- count = __raw_readl(wdt->base + TWD_WDOG_COUNTER);
- count = (0xFFFFFFFFU - count) * (HZ / 5);
- count = (count / 256) * mpcore_margin;
+ count = (wdt->timer_rate / 256) * mpcore_margin;
/* Reload the counter */
writel(count + wdt->perturb, wdt->base + TWD_WDOG_LOAD);
wdt->perturb = wdt->perturb ? 0 : 1;
+
spin_unlock(&wdt_lock);
}
@@ -329,6 +330,8 @@ static int __devinit mpcore_wdt_probe(st
struct mpcore_wdt *wdt;
struct resource *res;
int ret;
+ unsigned long count;
+ u64 waitjiffies;
/* We only accept one device, and it must have an id of -1 */
if (dev->id != -1)
@@ -375,6 +378,22 @@ static int __devinit mpcore_wdt_probe(st
goto err_irq;
}
+ waitjiffies = get_jiffies_64() + 1;
+ while (get_jiffies_64() < waitjiffies)
+ udelay(10);
+
+ waitjiffies += 5;
+
+ __raw_writel(0x00000001, wdt->base + TWD_WDOG_CONTROL);
+ __raw_writel(0xFFFFFFFFU, wdt->base + TWD_WDOG_LOAD);
+
+ while (get_jiffies_64() < waitjiffies)
+ udelay(10);
+
+ count = __raw_readl(wdt->base + TWD_WDOG_COUNTER);
+
+ wdt->timer_rate = (0xFFFFFFFFU - count) * (HZ / 5);
+
mpcore_wdt_stop(wdt);
platform_set_drvdata(dev, wdt);
mpcore_wdt_dev = dev;
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