From: Peng Fan peng.fan@nxp.com
Disable wdog3 which is configured by ROM
Signed-off-by: Peng Fan peng.fan@nxp.com --- arch/arm/mach-imx/imx8ulp/soc.c | 36 ++++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-imx/imx8ulp/soc.c b/arch/arm/mach-imx/imx8ulp/soc.c index 33aec228e3..051dec1a5a 100644 --- a/arch/arm/mach-imx/imx8ulp/soc.c +++ b/arch/arm/mach-imx/imx8ulp/soc.c @@ -144,9 +144,43 @@ int print_cpuinfo(void) } #endif
+#define UNLOCK_WORD0 0xC520 /* 1st unlock word */ +#define UNLOCK_WORD1 0xD928 /* 2nd unlock word */ +#define REFRESH_WORD0 0xA602 /* 1st refresh word */ +#define REFRESH_WORD1 0xB480 /* 2nd refresh word */ + +static void disable_wdog(void __iomem *wdog_base) +{ + u32 val_cs = readl(wdog_base + 0x00); + + if (!(val_cs & 0x80)) + return; + + dmb(); + __raw_writel(REFRESH_WORD0, (wdog_base + 0x04)); /* Refresh the CNT */ + __raw_writel(REFRESH_WORD1, (wdog_base + 0x04)); + dmb(); + + if (!(val_cs & 800)) { + dmb(); + __raw_writel(UNLOCK_WORD0, (wdog_base + 0x04)); + __raw_writel(UNLOCK_WORD1, (wdog_base + 0x04)); + dmb(); + + while (!(readl(wdog_base + 0x00) & 0x800)) + ; + } + writel(0x0, (wdog_base + 0x0C)); /* Set WIN to 0 */ + writel(0x400, (wdog_base + 0x08)); /* Set timeout to default 0x400 */ + writel(0x120, (wdog_base + 0x00)); /* Disable it and set update */ + + while (!(readl(wdog_base + 0x00) & 0x400)) + ; +} + void init_wdog(void) { - /* TODO */ + disable_wdog((void __iomem *)WDG3_RBASE); }
static struct mm_region imx8ulp_arm64_mem_map[] = {