1 files changed, 75 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/resetreason.c b/arch/arm/mach-omap2/resetreason.c
new file mode 100644
index 0000000..316bfeb
--- /dev/null
+++ b/arch/arm/mach-omap2/resetreason.c
@@ -0,0 +1,75 @@
+/*
+ * arch/arm/mach-omap2/resetreason.c
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include "prm-regbits-44xx.h"
+#include "prcm44xx.h"
+#include "prm44xx.h"
+#include "prminst44xx.h"
+#include "resetreason.h"
+
+static char resetreason[1024];
+
+static struct {
+	const char *str;
+	u32 mask;
+} resetreason_flags[] = {
+	{ "C2C ",			OMAP4430_C2C_RST_MASK },
+	{ "IcePick ",			OMAP4430_ICEPICK_RST_MASK },
+	{ "Voltage Manager ",		OMAP4430_VDD_MPU_VOLT_MGR_RST_MASK |
+					OMAP4430_VDD_IVA_VOLT_MGR_RST_MASK |
+					OMAP4430_VDD_CORE_VOLT_MGR_RST_MASK },
+	{ "external warm ",		OMAP4430_EXTERNAL_WARM_RST_MASK },
+	{ "MPU Watchdog Timer ",	OMAP4430_MPU_WDT_RST_MASK },
+	{ "warm software ",		OMAP4430_GLOBAL_WARM_SW_RST_MASK },
+	{ "cold ",			OMAP4430_GLOBAL_COLD_RST_MASK },
+};
+
+const char *omap4_get_resetreason(void)
+{
+	return resetreason;
+}
+
+static int __init resetreason_init(void)
+{
+	int i;
+	u32 reasons =
+		omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
+					    OMAP4430_PRM_DEVICE_INST,
+					    OMAP4_PRM_RSTST_OFFSET);
+	char buf[128];
+
+	strlcpy(resetreason, "Last reset was ", sizeof(resetreason));
+
+	for (i = 0; i < ARRAY_SIZE(resetreason_flags); i++)
+		if (reasons & resetreason_flags[i].mask)
+			strlcat(resetreason, resetreason_flags[i].str,
+				sizeof(resetreason));
+
+	snprintf(buf, sizeof(buf), "reset (PRM_RSTST=0x%x)\n", reasons);
+
+	strlcat(resetreason, buf, sizeof(resetreason));
+
+	pr_info("%s\n", resetreason);
+
+	omap4_prminst_write_inst_reg(reasons, OMAP4430_PRM_PARTITION,
+				     OMAP4430_PRM_DEVICE_INST, OMAP4_PRM_RSTST_OFFSET);
+
+	return 0;
+}
+
+postcore_initcall(resetreason_init);