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| author | Wim Van Sebroeck <wim@iguana.be> | 2012-07-08 16:57:09 +0400 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2012-07-23 14:50:30 +0400 |
| commit | 7732c6b96f127bb5d9474715149b4e94e369412c (patch) | |
| tree | d7c559fe593843387797360c99a3aad36540ca12 /drivers/watchdog/sch311x_wdt.c | |
| parent | 41814eed414ab3cef3d2b857ae3690a2b4888291 (diff) | |
| download | linux-7732c6b96f127bb5d9474715149b4e94e369412c.tar.xz | |
watchdog: sch311x_wdt: Fix Polarity when starting watchdog
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>
Diffstat (limited to 'drivers/watchdog/sch311x_wdt.c')
| -rw-r--r-- | drivers/watchdog/sch311x_wdt.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/watchdog/sch311x_wdt.c b/drivers/watchdog/sch311x_wdt.c index f8477002b728..9681ada0f252 100644 --- a/drivers/watchdog/sch311x_wdt.c +++ b/drivers/watchdog/sch311x_wdt.c @@ -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); |