ARM: mx25: Print the source of reset

Print the source of reset during boot.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

diff --git a/arch/arm/cpu/arm926ejs/mx25/generic.c b/arch/arm/cpu/arm926ejs/mx25/generic.c
index 21fe44f187ac3e1d12b61f2e0d9463525d175d49..126164020fb17507cfe73c75f0e76d29aaba7525 100644 (file)
--- 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