From 5cef8a367097923ec2c59ee3603535958976c465 Mon Sep 17 00:00:00 2001 From: Steffen Trumtrar Date: Fri, 27 Mar 2015 20:23:11 +0100 Subject: 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 Signed-off-by: Marc Kleine-Budde Signed-off-by: Sascha Hauer --- drivers/watchdog/im28wd.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/watchdog') 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); } -- cgit v1.2.3