[Patch V3 05/44] imx: imx8ulp: add get reset cause

Peng Fan (OSS)
2021-07-19T07:14:39Z

From: Peng Fan <peng.fan@nxp.com>

Add get reset cause function to show what triggerred reset.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
arch/arm/mach-imx/imx8ulp/soc.c | 69 +++++++++++++++++++++++++++++++++
1 file changed, 69 insertions(+)

diff --git a/arch/arm/mach-imx/imx8ulp/soc.c b/arch/arm/mach-imx/imx8ulp/soc.c
index e6ac5f8d25..383dbe6000 100644
--- a/arch/arm/mach-imx/imx8ulp/soc.c
+++ b/arch/arm/mach-imx/imx8ulp/soc.c
@@ -32,6 +32,73 @@ enum bt_mode get_boot_mode(void)
return LOW_POWER_BOOT;
}

+#define CMC_SRS_TAMPER BIT(31)
+#define CMC_SRS_SECURITY BIT(30)
+#define CMC_SRS_TZWDG BIT(29)
+#define CMC_SRS_JTAG_RST BIT(28)
+#define CMC_SRS_CORE1 BIT(16)
+#define CMC_SRS_LOCKUP BIT(15)
+#define CMC_SRS_SW BIT(14)
+#define CMC_SRS_WDG BIT(13)
+#define CMC_SRS_PIN_RESET BIT(8)
+#define CMC_SRS_WARM BIT(4)
+#define CMC_SRS_HVD BIT(3)
+#define CMC_SRS_LVD BIT(2)
+#define CMC_SRS_POR BIT(1)
+#define CMC_SRS_WUP BIT(0)
+
+static u32 reset_cause = -1;
+
+static char *get_reset_cause(char *ret)
+{
+ u32 cause1, cause = 0, srs = 0;
+ void __iomem *reg_ssrs = (void __iomem *)(SRC_BASE_ADDR + 0x88);
+ void __iomem *reg_srs = (void __iomem *)(SRC_BASE_ADDR + 0x80);
+
+ if (!ret)
+ return "null";
+
+ srs = readl(reg_srs);
+ cause1 = readl(reg_ssrs);
+
+ reset_cause = cause1;
+
+ cause = cause1 & (CMC_SRS_POR | CMC_SRS_WUP | CMC_SRS_WARM);
+
+ switch (cause) {
+ case CMC_SRS_POR:
+ sprintf(ret, "%s", "POR");
+ break;
+ case CMC_SRS_WUP:
+ sprintf(ret, "%s", "WUP");
+ break;
+ case CMC_SRS_WARM:
+ cause = cause1 & (CMC_SRS_WDG | CMC_SRS_SW |
+ CMC_SRS_JTAG_RST);
+ switch (cause) {
+ case CMC_SRS_WDG:
+ sprintf(ret, "%s", "WARM-WDG");
+ break;
+ case CMC_SRS_SW:
+ sprintf(ret, "%s", "WARM-SW");
+ break;
+ case CMC_SRS_JTAG_RST:
+ sprintf(ret, "%s", "WARM-JTAG");
+ break;
+ default:
+ sprintf(ret, "%s", "WARM-UNKN");
+ break;
+ }
+ break;
+ default:
+ sprintf(ret, "%s-%X", "UNKN", cause1);
+ break;
+ }
+
+ debug("[%X] SRS[%X] %X - ", cause1, srs, srs ^ cause1);
+ return ret;
+}
+
#if defined(CONFIG_DISPLAY_CPUINFO)
const char *get_imx_type(u32 imxtype)
{
@@ -50,6 +117,8 @@ int print_cpuinfo(void)
(cpurev & 0x000F0) >> 4, (cpurev & 0x0000F) >> 0,
mxc_get_clock(MXC_ARM_CLK) / 1000000);

+ printf("Reset cause: %s\n", get_reset_cause(cause));
+
printf("Boot mode: ");
switch (get_boot_mode()) {
case LOW_POWER_BOOT:
--
2.30.0