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ARM/MXS: add reset cause detection 

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Juergen Beisert 2012-07-18 10:46:50 +02:00 committed by Sascha Hauer
parent 67e4d52b40
commit 15d989e83d
1 changed files with 25 additions and 0 deletions
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25
drivers/watchdog/im28wd.c
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@ -21,6 +21,7 @@
#include <errno.h>
#include <malloc.h>
#include <watchdog.h>
#include <reset_source.h>
#define MXS_RTC_CTRL 0x0
#define MXS_RTC_SET_ADDR 0x4
@ -73,6 +74,27 @@ static int imx28_watchdog_set_timeout(struct watchdog *wd, unsigned timeout)
return 0;
}
static void __maybe_unused imx28_detect_reset_source(const struct imx28_wd *p)
{
u32 reg;
reg = readl(p->regs + MXS_RTC_PERSISTENT0);
if (reg & MXS_RTC_PERSISTENT0_EXT_RST) {
writel(MXS_RTC_PERSISTENT0_EXT_RST,
p->regs + MXS_RTC_PERSISTENT0 + MXS_RTC_CLR_ADDR);
set_reset_source(RESET_POR);
return;
}
if (reg & MXS_RTC_PERSISTENT0_THM_RST) {
writel(MXS_RTC_PERSISTENT0_THM_RST,
p->regs + MXS_RTC_PERSISTENT0 + MXS_RTC_CLR_ADDR);
set_reset_source(RESET_RST);
return;
}
set_reset_source(RESET_RST);
}
static int imx28_wd_probe(struct device_d *dev)
{
struct imx28_wd *priv;
@ -94,6 +116,9 @@ static int imx28_wd_probe(struct device_d *dev)
if (rc != 0)
goto on_error;
if (IS_ENABLED(CONFIG_RESET_SOURCE))
imx28_detect_reset_source(priv);
dev->priv = priv;
return 0;