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watchdog: w83627hf_wdt: add bootstatus support 

The status bit in the status and control register can tell us whether
the last reboot was caused by the watchdog. Make sure to take that into
the bootstatus before clearing it.

Signed-off-by: Henning Schild <henning.schild@siemens.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220824152448.7736-1-henning.schild@siemens.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Henning Schild 2022-08-24 17:24:48 +02:00 committed by Wim Van Sebroeck
parent dc1f12b916
commit 5a9fbf8b80
1 changed files with 10 additions and 2 deletions
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12
drivers/watchdog/w83627hf_wdt.c
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@ -113,6 +113,10 @@ MODULE_PARM_DESC(early_disable, "Disable watchdog at boot time (default=0)");
#define W836X7HF_WDT_CSR 0xf7
#define NCT6102D_WDT_CSR 0xf2
#define WDT_CSR_STATUS 0x10
#define WDT_CSR_KBD 0x40
#define WDT_CSR_MOUSE 0x80
static void superio_outb(int reg, int val)
{
outb(reg, WDT_EFER);
@ -244,8 +248,12 @@ static int w83627hf_init(struct watchdog_device *wdog, enum chips chip)
t = superio_inb(cr_wdt_control) & ~0x0C;
superio_outb(cr_wdt_control, t);
/* reset trigger, disable keyboard & mouse turning off watchdog */
t = superio_inb(cr_wdt_csr) & ~0xD0;
t = superio_inb(cr_wdt_csr);
if (t & WDT_CSR_STATUS)
wdog->bootstatus |= WDIOF_CARDRESET;
/* reset status, disable keyboard & mouse turning off watchdog */
t &= ~(WDT_CSR_STATUS | WDT_CSR_KBD | WDT_CSR_MOUSE);
superio_outb(cr_wdt_csr, t);
superio_exit();