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@xxxxxxxxx>
---
drivers/watchdog/imx2_wdt.c | 12 +++++++++++-
1 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index c44c333..940fd43 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 +186,15 @@ 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 = 0;
+ if (val & IMX2_WDT_WRSR_TOUT)
+ new_value = WDIOF_CARDRESET;
+ return put_user(new_value, p);
+
case WDIOC_KEEPALIVE:
imx2_wdt_ping();
return 0;
--
1.7.5.4
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