From 25d8e1bb197e9d3b165b64202014565e8be5a6c4 Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Mon, 18 Apr 2011 07:38:11 +0000 Subject: MX31: Introduce get_reset_cause() Signed-off-by: Fabio Estevam Acked-by: Detlev Zundel --- arch/arm/cpu/arm1136/mx31/generic.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/arch/arm/cpu/arm1136/mx31/generic.c b/arch/arm/cpu/arm1136/mx31/generic.c index 9b7a7a2..18572b9 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 -- cgit v1.1