Print the source of reset during boot.
Signed-off-by: Fabio Estevam fabio.estevam@freescale.com --- Changes since v1: - Fix the logic for detecting the reset cause
arch/arm/cpu/arm926ejs/mx25/generic.c | 25 ++++++++++++++++++++++++- 1 files changed, 24 insertions(+), 1 deletions(-)
diff --git a/arch/arm/cpu/arm926ejs/mx25/generic.c b/arch/arm/cpu/arm926ejs/mx25/generic.c index dca8d98..ed4b3e0 100644 --- a/arch/arm/cpu/arm926ejs/mx25/generic.c +++ b/arch/arm/cpu/arm926ejs/mx25/generic.c @@ -105,6 +105,28 @@ ulong imx_get_perclk (int clk) return lldiv (fref, div); }
+static char *get_reset_cause(void) +{ + /* read RCSR register from CCM module */ + struct ccm_regs *ccm = + (struct ccm_regs *)IMX_CCM_BASE; + + u32 cause = readl(&ccm->rcsr) & 0x0f; + + if (cause == 0) + return "POR"; + else if (cause == 1) + return "RST"; + else if ((cause & 2) == 2) + return "WDOG"; + else if ((cause & 4) == 4) + return "SW RESET"; + else if ((cause & 8) == 8) + return "JTAG"; + else + return "unknown reset"; + +}
u32 get_cpu_rev(void) { @@ -136,10 +158,11 @@ int print_cpuinfo (void) char buf[32]; u32 cpurev = get_cpu_rev(); - printf("CPU: Freescale i.MX25 rev%d.%d%s at %s MHz\n\n", + printf("CPU: Freescale i.MX25 rev%d.%d%s at %s MHz\n", (cpurev & 0xF0) >> 4, (cpurev & 0x0F), ((cpurev & 0x8000) ? " unknown" : ""), strmhz (buf, imx_get_armclk ())); + printf("Reset cause: %s\n\n", get_reset_cause()); return 0; } #endif