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>
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@ -21,6 +21,7 @@
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#define HW_CLKCTRL_RESET 0x1e0
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# define HW_CLKCTRL_RESET_CHIP (1 << 1)
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#define HW_CLKCTRL_WDOG_POR_DISABLE (1 << 5)
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/* Reset the full i.MX28 SoC via a chipset feature */
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void __noreturn reset_cpu(unsigned long addr)
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@ -35,3 +36,14 @@ void __noreturn reset_cpu(unsigned long addr)
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/*NOTREACHED*/
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}
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EXPORT_SYMBOL(reset_cpu);
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static int imx28_init(void)
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{
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/*
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* The default setting for the WDT is to do a POR. If the SoC is only
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* powered via battery, then a WDT reset powers the chip down instead
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* of resetting it. Use a software reset only.
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*/
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writel(HW_CLKCTRL_WDOG_POR_DISABLE, IMX_CCM_BASE + HW_CLKCTRL_RESET);
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}
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postcore_initcall(imx28_init);
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