[U-Boot] [PATCH v5] MX31: Introduce get_reset_cause()

Fabio Estevam
2011-04-18T17:38:11Z

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
Changes since v4:
- Make get_reset_cause CPU specific code and no need to
add any board specific call.

arch/arm/cpu/arm1136/mx31/generic.c | 29 ++++++++++++++++++++++++++++-
1 files changed, 28 insertions(+), 1 deletions(-)

diff --git a/arch/arm/cpu/arm1136/mx31/generic.c b/arch/arm/cpu/arm1136/mx31/generic.c
index 9b7a7a2..a92731e 100644
--- a/arch/arm/cpu/arm1136/mx31/generic.c
+++ b/arch/arm/cpu/arm1136/mx31/generic.c
@@ -132,11 +132,38 @@ char *get_cpu_rev(void)
return "unknown";
}

+char *get_reset_cause(void)
+{
+ /* read RCSR 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)
{
- printf("CPU: Freescale i.MX31 rev %s at %d MHz\n",
+ printf("CPU: Freescale i.MX31 rev %s at %d MHz.",
get_cpu_rev(), mx31_get_mcu_main_clk() / 1000000);
+ printf("Reset cause: %s\n", get_reset_cause());
return 0;
}
#endif
--
1.6.0.4