MX31: Introduce get_reset_cause()

[platform/kernel/u-boot.git] / arch / arm / cpu / arm1136 / mx31 / generic.c

diff --git a/arch/arm/cpu/arm1136/mx31/generic.c b/arch/arm/cpu/arm1136/mx31/generic.c
index cbe8243..18572b9 100644 (file)
--- a/arch/arm/cpu/arm1136/mx31/generic.c
+++ b/arch/arm/cpu/arm1136/mx31/generic.c
@@ -22,7 +22,7 @@
  */
 
 #include <common.h>
-#include <asm/arch/mx31-regs.h>
+#include <asm/arch/imx-regs.h>
 #include <asm/io.h>
 
 static u32 mx31_decode_pll(u32 reg, u32 infreq)
@@ -93,25 +93,77 @@ void mx31_gpio_mux(unsigned long mode)
 
 void mx31_set_pad(enum iomux_pins pin, u32 config)
 {
-       u32 field, l;
-       void *reg;
+       u32 field, l, reg;
 
        pin &= IOMUX_PADNUM_MASK;
        reg = (IOMUXC_BASE + 0x154) + (pin + 2) / 3 * 4;
        field = (pin + 2) % 3;
 
-       l = __raw_readl(reg);
+       l = __REG(reg);
        l &= ~(0x1ff << (field * 10));
        l |= config << (field * 10);
-       __raw_writel(l, reg);
+       __REG(reg) = l;
 
 }
 
+struct mx3_cpu_type mx31_cpu_type[] = {
+       { .srev = 0x00, .v = "1.0"  },
+       { .srev = 0x10, .v = "1.1"  },
+       { .srev = 0x11, .v = "1.1"  },
+       { .srev = 0x12, .v = "1.15" },
+       { .srev = 0x13, .v = "1.15" },
+       { .srev = 0x14, .v = "1.2"  },
+       { .srev = 0x15, .v = "1.2"  },
+       { .srev = 0x28, .v = "2.0"  },
+       { .srev = 0x29, .v = "2.0"  },
+};
+
+char *get_cpu_rev(void)
+{
+       u32 i, srev;
+
+       /* read SREV register from IIM module */
+       struct iim_regs *iim = (struct iim_regs *)MX31_IIM_BASE_ADDR;
+       srev = readl(&iim->iim_srev);
+
+       for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
+               if (srev == mx31_cpu_type[i].srev)
+                       return mx31_cpu_type[i].v;
+               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 at %d MHz\n",
-               mx31_get_mcu_main_clk() / 1000000);
+       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