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watchdog: make imx2_wdt report boot status correctly 

Ioctl WDIOC_GETBOOTSTATUS is supposed to return some information
on why the system did (re)boot recently, value WDIOF_CARDRESET
being used to indicate watchdog induced reboot.

Up to now, imx2_wdt did not provide a value here, always returning
zero to indicate normal boot.

Do evaluate the IMX Watchdog Reset Status Register and
produce WDIOF_CARDRESET with WDIOC_GETBOOTSTATUS in case
of a watchdog induced reset.

Signed-off-by: Oskar Schirmer <oskar@scara.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Oskar Schirmer 2012-02-16 12:17:45 +00:00 committed by Wim Van Sebroeck
parent 5ba927e8ca
commit 474ef12100
1 changed files with 9 additions and 1 deletions
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10
drivers/watchdog/imx2_wdt.c
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@ -46,6 +46,9 @@
#define IMX2_WDT_SEQ1 0x5555 /* -> service sequence 1 */
#define IMX2_WDT_SEQ2 0xAAAA /* -> service sequence 2 */
#define IMX2_WDT_WRSR 0x04 /* Reset Status Register */
#define IMX2_WDT_WRSR_TOUT (1 << 1) /* -> Reset due to Timeout */
#define IMX2_WDT_MAX_TIME 128
#define IMX2_WDT_DEFAULT_TIME 60 /* in seconds */
@ -175,6 +178,7 @@ static long imx2_wdt_ioctl(struct file *file, unsigned int cmd,
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_value;
u16 val;
switch (cmd) {
case WDIOC_GETSUPPORT:
@ -182,9 +186,13 @@ static long imx2_wdt_ioctl(struct file *file, unsigned int cmd,
sizeof(struct watchdog_info)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_GETBOOTSTATUS:
val = __raw_readw(imx2_wdt.base + IMX2_WDT_WRSR);
new_value = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0;
return put_user(new_value, p);
case WDIOC_KEEPALIVE:
imx2_wdt_ping();
return 0;