+#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;
+}