Introduce get_reset_cause() function to indicate the source of the reset.
Signed-off-by: Fabio Estevam fabio.estevam@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;