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author | Steffen Trumtrar <s.trumtrar@pengutronix.de> | 2015-03-27 20:23:11 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2015-03-30 19:24:01 +0200 |
commit | 5cef8a367097923ec2c59ee3603535958976c465 (patch) | |
tree | 8401d6e696b212001adba974e4a52f70a422bdf4 /drivers/watchdog/im28wd.c | |
parent | 3da922bb1b8109f8e2d0851e039addddb3a5ecfa (diff) | |
download | barebox-5cef8a367097923ec2c59ee3603535958976c465.tar.gz barebox-5cef8a367097923ec2c59ee3603535958976c465.tar.xz |
ARM/MXS/i.MX28: recognize watchdog reset
When a watchdog timeout is set in the linux kernel, the FORCE_UPDATE bit is set.
Use this to recognize a system reset that was triggered by the watchdog.
Since only the wdt part of the kernel driver sets this bit, this is a safe
distinguishing feature.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/watchdog/im28wd.c')
-rw-r--r-- | drivers/watchdog/im28wd.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/watchdog/im28wd.c b/drivers/watchdog/im28wd.c index 3e73ecd62e..a9093a7b51 100644 --- a/drivers/watchdog/im28wd.c +++ b/drivers/watchdog/im28wd.c @@ -176,6 +176,13 @@ static void __maybe_unused imx28_detect_reset_source(const struct imx28_wd *p) reset_source_set(RESET_RST); return; } + reg = readl(p->regs + MXS_RTC_PERSISTENT1); + if (reg & MXS_RTC_PERSISTENT1_FORCE_UPDATER) { + writel(MXS_RTC_PERSISTENT1_FORCE_UPDATER, + p->regs + MXS_RTC_PERSISTENT1 + MXS_RTC_CLR_ADDR); + reset_source_set(RESET_WDG); + return; + } reset_source_set(RESET_RST); } |