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ARM i.MX28: change default watchdog reset method 

The default setting for the imx28 watchdog is to do a power-off reset. If the
SoC is only powered via battery, then the watchdog powers the chip down, though.
According to the datasheet it should still be possible to execute a proper POR
with battery power, but testing showed otherwise.
When the watchdog power-off reset is disabled, a software reset is executed
instead. This works with and without battery power.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Steffen Trumtrar 2013-02-11 11:42:05 +01:00 committed by Sascha Hauer
parent c0ba0a64ae
commit 2ccd4510bd
1 changed files with 12 additions and 0 deletions
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12
arch/arm/mach-mxs/soc-imx28.c
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@ -21,6 +21,7 @@
#define HW_CLKCTRL_RESET 0x1e0
# define HW_CLKCTRL_RESET_CHIP (1 << 1)
#define HW_CLKCTRL_WDOG_POR_DISABLE (1 << 5)
/* Reset the full i.MX28 SoC via a chipset feature */
void __noreturn reset_cpu(unsigned long addr)
@ -35,3 +36,14 @@ void __noreturn reset_cpu(unsigned long addr)
/*NOTREACHED*/
}
EXPORT_SYMBOL(reset_cpu);
static int imx28_init(void)
{
/*
* The default setting for the WDT is to do a POR. If the SoC is only
* powered via battery, then a WDT reset powers the chip down instead
* of resetting it. Use a software reset only.
*/
writel(HW_CLKCTRL_WDOG_POR_DISABLE, IMX_CCM_BASE + HW_CLKCTRL_RESET);
}
postcore_initcall(imx28_init);