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-rw-r--r--arch/arm/mach-omap1/reset.c41
1 files changed, 39 insertions, 2 deletions
diff --git a/arch/arm/mach-omap1/reset.c b/arch/arm/mach-omap1/reset.c
index b177091..5eebd7e 100644
--- a/arch/arm/mach-omap1/reset.c
+++ b/arch/arm/mach-omap1/reset.c
@@ -4,12 +4,24 @@
#include <linux/kernel.h>
#include <linux/io.h>
-#include <plat/prcm.h>
-
#include <mach/hardware.h>
+#include "iomap.h"
#include "common.h"
+/* ARM_SYSST bit shifts related to SoC reset sources */
+#define ARM_SYSST_POR_SHIFT 5
+#define ARM_SYSST_EXT_RST_SHIFT 4
+#define ARM_SYSST_ARM_WDRST_SHIFT 2
+#define ARM_SYSST_GLOB_SWRST_SHIFT 1
+
+/* Standardized reset source bits (across all OMAP SoCs) */
+#define OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT 0
+#define OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT 1
+#define OMAP_MPU_WD_RST_SRC_ID_SHIFT 3
+#define OMAP_EXTWARM_RST_SRC_ID_SHIFT 5
+
+
void omap1_restart(char mode, const char *cmd)
{
/*
@@ -23,3 +35,28 @@ void omap1_restart(char mode, const char *cmd)
omap_writew(1, ARM_RSTCT1);
}
+
+/**
+ * omap1_get_reset_sources - return the source of the SoC's last reset
+ *
+ * Returns bits that represent the last reset source for the SoC. The
+ * format is standardized across OMAPs for use by the OMAP watchdog.
+ */
+u32 omap1_get_reset_sources(void)
+{
+ u32 ret = 0;
+ u16 rs;
+
+ rs = __raw_readw(OMAP1_IO_ADDRESS(ARM_SYSST));
+
+ if (rs & (1 << ARM_SYSST_POR_SHIFT))
+ ret |= 1 << OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT;
+ if (rs & (1 << ARM_SYSST_EXT_RST_SHIFT))
+ ret |= 1 << OMAP_EXTWARM_RST_SRC_ID_SHIFT;
+ if (rs & (1 << ARM_SYSST_ARM_WDRST_SHIFT))
+ ret |= 1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT;
+ if (rs & (1 << ARM_SYSST_GLOB_SWRST_SHIFT))
+ ret |= 1 << OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT;
+
+ return ret;
+}