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watchdog: sch311x_wdt: Fix Polarity when starting watchdog

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Some motherboards like the Advantech ARK3400 documentation
use a non-inverted GPIO pin. We fix this by assuming that
the BIOS will set the Polarity bit for the GPIO correctly
at startup and we keep the Bit-setting intact when we start
and stop the watchdog.

Reported-by: Jean-François Deverge <jf.deverge@gmail.com>
Signed-off-by: Dave Mueller <d.mueller@elsoft.ch>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Wim Van Sebroeck 2012-07-08 14:57:09 +02:00
parent 41814eed41
commit 7732c6b96f
1 changed files with 8 additions and 2 deletions
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10
drivers/watchdog/sch311x_wdt.c
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@ -136,6 +136,8 @@ static void sch311x_wdt_set_timeout(int t)
static void sch311x_wdt_start(void)
{
unsigned char t;
spin_lock(&sch311x_wdt_data.io_lock);
/* set watchdog's timeout */
@ -149,7 +151,8 @@ static void sch311x_wdt_start(void)
* Bit 4-6 (Reserved)
* Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
*/
outb(0x0e, sch311x_wdt_data.runtime_reg + GP60);
t = inb(sch311x_wdt_data.runtime_reg + GP60);
outb((t & ~0x0d) | 0x0c, sch311x_wdt_data.runtime_reg + GP60);
spin_unlock(&sch311x_wdt_data.io_lock);
@ -157,10 +160,13 @@ static void sch311x_wdt_start(void)
static void sch311x_wdt_stop(void)
{
unsigned char t;
spin_lock(&sch311x_wdt_data.io_lock);
/* stop the watchdog */
outb(0x01, sch311x_wdt_data.runtime_reg + GP60);
t = inb(sch311x_wdt_data.runtime_reg + GP60);
outb((t & ~0x0d) | 0x01, sch311x_wdt_data.runtime_reg + GP60);
/* disable timeout by setting it to 0 */
sch311x_wdt_set_timeout(0);