rockchip: Add common reset cause

Add cpu reset cause in common cpu-info file.

This would help to print the reset cause for
various resets.

Right now it support rk3288, rk3399. rest of rockchip
platforms doesn't have reset cause support ye but this
code is more feasible to extend the same.

Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/arch/arm/mach-rockchip/cpu-info.c b/arch/arm/mach-rockchip/cpu-info.c
index 9bccbd4f68..4b0e99299a 100644
--- a/arch/arm/mach-rockchip/cpu-info.c
+++ b/arch/arm/mach-rockchip/cpu-info.c
@@ -5,10 +5,59 @@
  */
 
 #include <common.h>
+#include <asm/io.h>
+#include <asm/arch-rockchip/clock.h>
+#include <asm/arch-rockchip/cru.h>
+#include <asm/arch-rockchip/hardware.h>
+#include <linux/err.h>
+
+static char *get_reset_cause(void)
+{
+	struct rockchip_cru *cru = rockchip_get_cru();
+	char *cause = NULL;
+
+	if (IS_ERR(cru))
+		return cause;
+
+	switch (cru->glb_rst_st) {
+	case GLB_POR_RST:
+		cause = "POR";
+		break;
+	case FST_GLB_RST_ST:
+	case SND_GLB_RST_ST:
+		cause = "RST";
+		break;
+	case FST_GLB_TSADC_RST_ST:
+	case SND_GLB_TSADC_RST_ST:
+		cause = "THERMAL";
+		break;
+	case FST_GLB_WDT_RST_ST:
+	case SND_GLB_WDT_RST_ST:
+		cause = "WDOG";
+		break;
+	default:
+		cause = "unknown reset";
+	}
+
+	/**
+	 * reset_reason env is used by rk3288, due to special use case
+	 * to figure it the boot behavior. so keep this as it is.
+	 */
+	env_set("reset_reason", cause);
+
+	/*
+	 * Clear glb_rst_st, so we can determine the last reset cause
+	 * for following resets.
+	 */
+	rk_clrreg(&cru->glb_rst_st, GLB_RST_ST_MASK);
+
+	return cause;
+}
 
 int print_cpuinfo(void)
 {
 	printf("SoC: Rockchip %s\n", CONFIG_SYS_SOC);
+	printf("Reset cause: %s\n", get_reset_cause());
 
 	/* TODO print operating temparature and clock */