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authorLinus Torvalds <torvalds@linux-foundation.org>2009-08-02 14:15:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-08-02 14:15:46 -0700
commit4905f92ed752d49ebe9cce4fe78a4bc39e710523 (patch)
tree533cdb174d61a92033083b027e0b34981fc42130 /drivers
parent0ce166b7b46122bf91a4766e20c85a6485448765 (diff)
parent5973bee46fe66db94fab198979dec87f263fc2a8 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog
* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog: [WATCHDOG] Fix COH 901 327 watchdog enablement
Diffstat (limited to 'drivers')
-rw-r--r--drivers/watchdog/coh901327_wdt.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/watchdog/coh901327_wdt.c b/drivers/watchdog/coh901327_wdt.c
index fecb307d28e..aec7cefdef2 100644
--- a/drivers/watchdog/coh901327_wdt.c
+++ b/drivers/watchdog/coh901327_wdt.c
@@ -18,6 +18,7 @@
#include <linux/bitops.h>
#include <linux/uaccess.h>
#include <linux/clk.h>
+#include <linux/delay.h>
#define DRV_NAME "WDOG COH 901 327"
@@ -92,6 +93,8 @@ static struct clk *clk;
static void coh901327_enable(u16 timeout)
{
u16 val;
+ unsigned long freq;
+ unsigned long delay_ns;
clk_enable(clk);
/* Restart timer if it is disabled */
@@ -102,6 +105,14 @@ static void coh901327_enable(u16 timeout)
/* Acknowledge any pending interrupt so it doesn't just fire off */
writew(U300_WDOG_IER_WILL_BARK_IRQ_ACK_ENABLE,
virtbase + U300_WDOG_IER);
+ /*
+ * The interrupt is cleared in the 32 kHz clock domain.
+ * Wait 3 32 kHz cycles for it to take effect
+ */
+ freq = clk_get_rate(clk);
+ delay_ns = (1000000000 + freq - 1) / freq; /* Freq to ns and round up */
+ delay_ns = 3 * delay_ns; /* Wait 3 cycles */
+ ndelay(delay_ns);
/* Enable the watchdog interrupt */
writew(U300_WDOG_IMR_WILL_BARK_IRQ_ENABLE, virtbase + U300_WDOG_IMR);
/* Activate the watchdog timer */