Exynos5: TMU: Add hardware tripping

This adds hardware tripping at 110 degrees celsius which must enable
forced system shutdown in case TMU fails to power off.

Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/cpu/armv7/exynos/power.c

@@ -128,3 +128,15 @@ void set_xclkout(void)
 	if (cpu_is_exynos5())
 		exynos5_set_xclkout();
 }
+
+/* Enables hardware tripping to power off the system when TMU fails */
+void set_hw_thermal_trip(void)
+{
+	if (cpu_is_exynos5()) {
+		struct exynos5_power *power =
+			(struct exynos5_power *)samsung_get_base_power();
+
+		/* PS_HOLD_CONTROL register ENABLE_HW_TRIP bit*/
+		setbits_le32(&power->ps_hold_control, POWER_ENABLE_HW_TRIP);
+	}
+}

arch/arm/include/asm/arch-exynos/power.h

@@ -857,6 +857,9 @@ void set_mipi_phy_ctrl(unsigned int dev_index, unsigned int enable);
 
 void set_usbhost_phy_ctrl(unsigned int enable);
 
+/* Enables hardware tripping to power off the system when TMU fails */
+void set_hw_thermal_trip(void);
+
 #define POWER_USB_HOST_PHY_CTRL_EN		(1 << 0)
 #define POWER_USB_HOST_PHY_CTRL_DISABLE		(0 << 0)
 
@@ -865,6 +868,7 @@ void set_dp_phy_ctrl(unsigned int enable);
 #define EXYNOS_DP_PHY_ENABLE		(1 << 0)
 
 #define EXYNOS_PS_HOLD_CONTROL_DATA_HIGH	(1 << 8)
+#define POWER_ENABLE_HW_TRIP			(1UL << 31)
 
 /*
  * Set ps_hold data driving value high

drivers/power/exynos-tmu.c

@@ -22,9 +22,11 @@
 #include <fdtdec.h>
 #include <tmu.h>
 #include <asm/arch/tmu.h>
+#include <asm/arch/power.h>
 
 #define TRIMINFO_RELOAD		1
 #define CORE_EN			1
+#define THERM_TRIP_EN		(1 << 12)
 
 #define INTEN_RISE0		1
 #define INTEN_RISE1		(1 << 4)
@@ -55,6 +57,8 @@ struct temperature_params {
 	unsigned int start_warning;
 	/* temperature threshold CPU tripping */
 	unsigned int start_tripping;
+	/* temperature threshold for HW tripping */
+	unsigned int hardware_tripping;
 };
 
 /* Pre-defined values and thresholds for calibration of current temperature */
@@ -196,6 +200,9 @@ static int get_tmu_fdt_values(struct tmu_info *info, const void *blob)
 	info->data.ts.start_tripping = fdtdec_get_int(blob,
 				node, "samsung,start-tripping", -1);
 	error |= info->data.ts.start_tripping;
+	info->data.ts.hardware_tripping = fdtdec_get_int(blob,
+				node, "samsung,hw-tripping", -1);
+	error |= info->data.ts.hardware_tripping;
 	info->data.efuse_min_value = fdtdec_get_int(blob,
 				node, "samsung,efuse-min-value", -1);
 	error |= info->data.efuse_min_value;
@@ -230,7 +237,7 @@ static int get_tmu_fdt_values(struct tmu_info *info, const void *blob)
 static void tmu_setup_parameters(struct tmu_info *info)
 {
 	unsigned int te_code, con;
-	unsigned int warning_code, trip_code;
+	unsigned int warning_code, trip_code, hwtrip_code;
 	unsigned int cooling_temp;
 	unsigned int rising_value;
 	struct tmu_data *data = &info->data;
@@ -254,9 +261,14 @@ static void tmu_setup_parameters(struct tmu_info *info)
 			+ info->te1 - info->dc_value;
 	trip_code = data->ts.start_tripping
 			+ info->te1 - info->dc_value;
+	hwtrip_code = data->ts.hardware_tripping
+			+ info->te1 - info->dc_value;
+
 	cooling_temp = 0;
 
-	rising_value = ((warning_code << 8) | (trip_code << 16));
+	rising_value = ((warning_code << 8) |
+			(trip_code << 16) |
+			(hwtrip_code << 24));
 
 	/* Set interrupt level */
 	writel(rising_value, &reg->threshold_temp_rise);
@@ -276,12 +288,15 @@ static void tmu_setup_parameters(struct tmu_info *info)
 
 	/* TMU core enable */
 	con = readl(&reg->tmu_control);
-	con |= CORE_EN;
+	con |= THERM_TRIP_EN | CORE_EN;
 
 	writel(con, &reg->tmu_control);
 
-	/* LEV0 LEV1 LEV2 interrupt enable */
-	writel(INTEN_RISE0 | INTEN_RISE1 | INTEN_RISE2,	&reg->inten);
+	/* Enable HW thermal trip */
+	set_hw_thermal_trip();
+
+	/* LEV1 LEV2 interrupt enable */
+	writel(INTEN_RISE1 | INTEN_RISE2, &reg->inten);
 }
 
 /*