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-rw-r--r--arch/arm/cpu/armv7/mx6/soc.c38
-rw-r--r--arch/arm/include/asm/arch-mx6/sys_proto.h1
-rw-r--r--include/imx_thermal.h6
3 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index f91b725b15..b21bd03a8a 100644
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -124,6 +124,44 @@ 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)
{
diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h b/arch/arm/include/asm/arch-mx6/sys_proto.h
index a2cd0a9eff..c5832912b4 100644
--- a/arch/arm/include/asm/arch-mx6/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx6/sys_proto.h
@@ -17,6 +17,7 @@
u32 get_nr_cpus(void);
u32 get_cpu_rev(void);
u32 get_cpu_speed_grade_hz(void);
+u32 get_cpu_temp_grade(int *minc, int *maxc);
/* returns MXC_CPU_ value */
#define cpu_type(rev) (((rev) >> 12)&0xff)
diff --git a/include/imx_thermal.h b/include/imx_thermal.h
index be1365288e..8ce333cd56 100644
--- a/include/imx_thermal.h
+++ b/include/imx_thermal.h
@@ -8,6 +8,12 @@
#ifndef _IMX_THERMAL_H_
#define _IMX_THERMAL_H_
+/* CPU Temperature Grades */
+#define TEMP_COMMERCIAL 0
+#define TEMP_EXTCOMMERCIAL 1
+#define TEMP_INDUSTRIAL 2
+#define TEMP_AUTOMOTIVE 3
+
struct imx_thermal_plat {
void *regs;
int fuse_bank;