[U-Boot] [PATCH 3/4] imx: mx6: add display of temperature grade of processor in cpu_printinfo()

[Tim Harvey]

The MX6 has a temperature grade defined by OCOTP_MEM0[7:6].

While the MX6SX also has temperature grades, I see no mention in the reference
manual where that information is stored in the OTP.

Signed-off-by: Tim Harvey <tharvey at gateworks.com>
---
 arch/arm/cpu/armv7/mx6/soc.c              | 32 +++++++++++++++++++++++++++++++
 arch/arm/imx-common/cpu.c                 | 28 ++++++++++++++++++++++-----
 arch/arm/include/asm/arch-mx6/sys_proto.h |  1 +
 include/imx_thermal.h                     |  6 ++++++
 4 files changed, 62 insertions(+), 5 deletions(-)

diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index dc422a6..8d41c47 100644
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -109,6 +109,38 @@ u32 get_cpu_speed_grade_hz(void)
 	return 792000000;
 }
 
+#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/imx-common/cpu.c b/arch/arm/imx-common/cpu.c
index ead7f08..a1045db 100644
--- a/arch/arm/imx-common/cpu.c
+++ b/arch/arm/imx-common/cpu.c
@@ -16,6 +16,7 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/arch/crm_regs.h>
+#include <imx_thermal.h>
 #include <ipu_pixfmt.h>
 #include <thermal.h>
 #include <sata.h>
@@ -146,24 +147,41 @@ int print_cpuinfo(void)
 
 #if defined(CONFIG_MX6) && defined(CONFIG_IMX6_THERMAL)
 	struct udevice *thermal_dev;
-	int cpu_tmp, ret;
+	int cpu_tmp, minc, maxc, ret;
 #endif
 
 	cpurev = get_cpu_rev();
 
 #if defined(CONFIG_MX6)
 	printf("CPU:   Freescale i.MX%s rev%d.%d",
-		get_imx_type((cpurev & 0xFF000) >> 12),
-		(cpurev & 0x000F0) >> 4,
-		(cpurev & 0x0000F) >> 0);
+	       get_imx_type((cpurev & 0xFF000) >> 12),
+	       (cpurev & 0x000F0) >> 4,
+	       (cpurev & 0x0000F) >> 0);
 	if (is_cpu_type(MXC_CPU_MX6SX))
 		printf(" at %d MHz", mxc_get_clock(MXC_ARM_CLK) / 1000000);
 	else {
+#if defined(CONFIG_IMX6_THERMAL)
+		switch (get_cpu_temp_grade(&minc, &maxc)) {
+		case TEMP_AUTOMOTIVE:
+			puts(" automotive");
+			break;
+		case TEMP_INDUSTRIAL:
+			puts(" industrial");
+			break;
+		case TEMP_EXTCOMMERCIAL:
+			puts(" extended commercial");
+			break;
+		default:
+			puts(" commercial");
+			break;
+		}
+		printf(" (%dC to %dC)", minc, maxc);
 		printf(" %d MHz", get_cpu_speed_grade_hz() / 1000000);
 		if (get_cpu_speed_grade_hz() != mxc_get_clock(MXC_ARM_CLK)) {
 			printf(" (at %d MHz)",
 			       mxc_get_clock(MXC_ARM_CLK) / 1000000);
 		}
+#endif /* #if defined(CONFIG_IMX6_THERMAL) */
 	}
 	puts("\n");
 #else
@@ -172,7 +190,7 @@ int print_cpuinfo(void)
 		(cpurev & 0x000F0) >> 4,
 		(cpurev & 0x0000F) >> 0,
 		mxc_get_clock(MXC_ARM_CLK) / 1000000);
-#endif
+#endif /* #if defined(CONFIG_MX6) */
 
 #if defined(CONFIG_MX6) && defined(CONFIG_IMX6_THERMAL)
 	ret = uclass_get_device(UCLASS_THERMAL, 0, &thermal_dev);
diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h b/arch/arm/include/asm/arch-mx6/sys_proto.h
index a2cd0a9..c583291 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 be13652..8ce333c 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;
-- 
1.9.1