Introduce get_reset_cause() function to indicate the source of the reset.
Signed-off-by: Fabio Estevam <fabio.este...@freescale.com>
---
arch/arm/cpu/arm1136/mx31/generic.c | 26 ++++++++++++++++++++++++++
arch/arm/include/asm/arch-mx31/imx-regs.h | 2 ++
2 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/arch/arm/cpu/arm1136/mx31/generic.c
b/arch/arm/cpu/arm1136/mx31/generic.c
index 9b7a7a2..ea452a9 100644
--- a/arch/arm/cpu/arm1136/mx31/generic.c
+++ b/arch/arm/cpu/arm1136/mx31/generic.c
@@ -132,6 +132,32 @@ char *get_cpu_rev(void)
return "unknown";
}
+char *get_reset_cause(void)
+{
+ /* read SRS register from CCM module */
+ struct clock_control_regs *ccm =
+ (struct clock_control_regs *)CCM_BASE;
+
+ u32 cause = readl(&ccm->rcsr) & 0x07;
+
+ switch (cause) {
+ case 0x0000:
+ return "POR";
+ break;
+ case 0x0001:
+ return "RST";
+ break;
+ case 0x0002:
+ return "WDOG";
+ break;
+ case 0x0006:
+ return "JTAG";
+ break;
+ default:
+ return "unknown reset";
+ }
+}
+
#if defined(CONFIG_DISPLAY_CPUINFO)
int print_cpuinfo (void)
{
diff --git a/arch/arm/include/asm/arch-mx31/imx-regs.h
b/arch/arm/include/asm/arch-mx31/imx-regs.h
index 74444f2..2b0881d 100644
--- a/arch/arm/include/asm/arch-mx31/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx31/imx-regs.h
@@ -27,6 +27,8 @@
#if !(defined(__KERNEL_STRICT_NAMES) || defined(__ASSEMBLY__))
#include <asm/types.h>
+extern char *get_reset_cause(void);
+
/* Clock control module registers */
struct clock_control_regs {
u32 ccmr;
--
1.6.0.4
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