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[WATCHDOG] Fix COH 901 327 watchdog enablement 

Since the COH 901 327 found in U300 is clocked at 32 kHz we need
to wait for the interrupt clearing flag to propagate through
hardware in order not to accidentally fire off any interrupts
when we enable them.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
hifive-unleashed-5.1
Linus Walleij 2009-07-21 00:40:46 +02:00 committed by Wim Van Sebroeck
parent ed680c4ad4
commit 5973bee46f
1 changed files with 11 additions and 0 deletions
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11
drivers/watchdog/coh901327_wdt.c
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@ -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 */