imx: mx6: add get_cpu_temp_grade to obtain cpu temperature grade from OTP

[karo-tx-uboot.git] / arch / arm / cpu / armv7 / mx6 / soc.c

diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index f49dd37bf29d88307c652f6840988f8c2ada9375..3447c89ad15feaf861dd428c3ec1d11ef92bdf14 100644 (file)
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -149,6 +149,44 @@ u32 get_cpu_speed_grade_hz(void)
        return 0;
 }
 
+/*
+ * OCOTP_MEM0[7:6] (see Fusemap Description Table offset 0x480)
+ * defines a 2-bit Temperature Grade
+ *
+ * return temperature grade and min/max temperature in celcius
+ */
+#define OCOTP_MEM0_TEMP_SHIFT          6
+
+u32 get_cpu_temp_grade(int *minc, int *maxc)
+{
+       struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
+       struct fuse_bank *bank = &ocotp->bank[1];
+       struct fuse_bank1_regs *fuse =
+               (struct fuse_bank1_regs *)bank->fuse_regs;
+       uint32_t val;
+
+       val = readl(&fuse->mem0);
+       val >>= OCOTP_MEM0_TEMP_SHIFT;
+       val &= 0x3;
+
+       if (minc && maxc) {
+               if (val == TEMP_AUTOMOTIVE) {
+                       *minc = -40;
+                       *maxc = 125;
+               } else if (val == TEMP_INDUSTRIAL) {
+                       *minc = -40;
+                       *maxc = 105;
+               } else if (val == TEMP_EXTCOMMERCIAL) {
+                       *minc = -20;
+                       *maxc = 105;
+               } else {
+                       *minc = 0;
+                       *maxc = 95;
+               }
+       }
+       return val;
+}
+
 #ifdef CONFIG_REVISION_TAG
 u32 __weak get_board_rev(void)
 {