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

The MX6 has a temperature grade defined by OCOTP_MEM0[7:6] which is at 0x480
in the Fusemap Description Table in the reference manual. Return this value
as well as min/max temperature based on the value.

Note that the IMX6SDLRM and the IMX6SXRM do not indicate this in the
their Fusemap Description Table however Freescale has confirmed that these
eFUSE bits match the description within the IMX6DQRM and that they will
be added to the next revision of the respective reference manuals.

This has been tested with IMX6 Automative and Industrial parts.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

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)
 {

diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h b/arch/arm/include/asm/arch-mx6/sys_proto.h
index 0db28f48a141b3f6442fa719877619c09bef3b22..552818954db79d2201a1767c8f9353c54b8b5aa9 100644 (file)
--- 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 be1365288e5da5316932cd9e062515dc522f8831..8ce333cd56a0cff20a9a6fe07d85807416b7dcbc 100644 (file)
--- 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;