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| author | Oskar Schirmer <oskar@scara.com> | 2012-02-16 12:17:45 +0000 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2012-03-27 19:58:30 +0200 |
| commit | 474ef121008a2992bcc496930166ced89bda23d2 (patch) | |
| tree | 5411110e4ff37ca1e2e4196d5433d4065c583e62 | |
| parent | 5ba927e8ca3f73acb98f417d126652e26ab40a57 (diff) | |
| download | blackbird-op-linux-474ef121008a2992bcc496930166ced89bda23d2.tar.gz blackbird-op-linux-474ef121008a2992bcc496930166ced89bda23d2.zip | |
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>
| -rw-r--r-- | drivers/watchdog/imx2_wdt.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c index c44c3334003a..d34a426ad178 100644 --- a/drivers/watchdog/imx2_wdt.c +++ b/drivers/watchdog/imx2_wdt.c @@ -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; |
