[U-Boot] [PATCH 8/9 v8] EXYNOS5: TMU: Add hardware tripping

[Akshay Saraswat]

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 <aksha...@samsung.com>
Acked-by: Simon Glass <s...@chromium.org>
---
Changes since v7:
        - None.

 arch/arm/cpu/armv7/exynos/power.c        |   10 ++++++++++
 arch/arm/include/asm/arch-exynos/power.h |    5 +++++
 drivers/power/exynos-tmu.c               |   25 ++++++++++++++++++++-----
 3 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/arch/arm/cpu/armv7/exynos/power.c 
b/arch/arm/cpu/armv7/exynos/power.c
index 73f764e..234c9f4 100644
--- a/arch/arm/cpu/armv7/exynos/power.c
+++ b/arch/arm/cpu/armv7/exynos/power.c
@@ -96,6 +96,16 @@ void set_dp_phy_ctrl(unsigned int enable)
                exynos5_dp_phy_control(enable);
 }
 
+/* Enables hardware tripping to power off the system when TMU fails */
+void power_enable_hw_thermal_trip(void)
+{
+       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);
+}
+
 /*
  * This function never returns.
  * When called this function makes system hang and PAD driving value high
diff --git a/arch/arm/include/asm/arch-exynos/power.h 
b/arch/arm/include/asm/arch-exynos/power.h
index 7463036..034774f 100644
--- a/arch/arm/include/asm/arch-exynos/power.h
+++ b/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 power_enable_hw_thermal_trip(void);
+
 #define POWER_USB_HOST_PHY_CTRL_EN             (1 << 0)
 #define POWER_USB_HOST_PHY_CTRL_DISABLE                (0 << 0)
 
@@ -864,5 +867,7 @@ void set_dp_phy_ctrl(unsigned int enable);
 
 #define EXYNOS_DP_PHY_ENABLE           (1 << 0)
 #define POWER_PS_HOLD_CONTROL_DATA_HIGH         (1 << 8)
+#define POWER_ENABLE_HW_TRIP                   (1UL << 31)
+
 
 #endif
diff --git a/drivers/power/exynos-tmu.c b/drivers/power/exynos-tmu.c
index 83a2572..9d28614 100644
--- a/drivers/power/exynos-tmu.c
+++ b/drivers/power/exynos-tmu.c
@@ -22,9 +22,11 @@
 #include <fdtdec.h>
 #include <tmu.h>
 #include <asm/arch/exynos-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 */
@@ -195,6 +199,9 @@ 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;
@@ -228,7 +235,7 @@ int get_tmu_fdt_values(struct tmu_info *info, const void 
*blob)
 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;
@@ -252,9 +259,14 @@ 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);
@@ -274,12 +286,15 @@ 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 */
+       power_enable_hw_thermal_trip();
+
+       /* LEV1 LEV2 interrupt enable */
+       writel(INTEN_RISE1 | INTEN_RISE2, &reg->inten);
 }
 
 /*
-- 
1.7.9.5

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