Adding Exynos Thermal Management Unit driver to monitor SOC temperature and take actions corresponding to states of TMU.

Signed-off-by: Akshay Saraswat akshay.s@samsung.com Acked-by: Simon Glass sjg@chromium.org --- Changes since v5: - Added Acked-by. - Changed position of config in makefile. - Added {} braces for one liner if-else. - Changed 'puts' to 'debug' int tmu_init. - Removed 'tmu_mux' from 'tmu_info' struct. - Removed 'if' and added 'while' in get_cur_temp because first temperature sensing takes time.

arch/arm/include/asm/arch-exynos/exynos-tmu.h | 58 +++++ drivers/power/Makefile | 1 + drivers/power/exynos-tmu.c | 302 +++++++++++++++++++++++++ include/tmu.h | 46 ++++ 4 files changed, 407 insertions(+) create mode 100644 arch/arm/include/asm/arch-exynos/exynos-tmu.h create mode 100644 drivers/power/exynos-tmu.c create mode 100644 include/tmu.h

diff --git a/arch/arm/include/asm/arch-exynos/exynos-tmu.h b/arch/arm/include/asm/arch-exynos/exynos-tmu.h new file mode 100644 index 0000000..c79a520 --- /dev/null +++ b/arch/arm/include/asm/arch-exynos/exynos-tmu.h @@ -0,0 +1,58 @@ +/* + * Copyright (c) 2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * Akshay Saraswat akshay.s@samsung.com + * + * EXYNOS - Thermal Management Unit + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef __ASM_ARCH_TMU_H +#define __ASM_ARCH_TMU_H + +struct tmu_reg { + unsigned triminfo; + unsigned rsvd1; + unsigned rsvd2; + unsigned rsvd3; + unsigned rsvd4; + unsigned triminfo_control; + unsigned rsvd5; + unsigned rsvd6; + unsigned tmu_control; + unsigned rsvd7; + unsigned tmu_status; + unsigned sampling_internal; + unsigned counter_value0; + unsigned counter_value1; + unsigned rsvd8; + unsigned rsvd9; + unsigned current_temp; + unsigned rsvd10; + unsigned rsvd11; + unsigned rsvd12; + unsigned threshold_temp_rise; + unsigned threshold_temp_fall; + unsigned rsvd13; + unsigned rsvd14; + unsigned past_temp3_0; + unsigned past_temp7_4; + unsigned past_temp11_8; + unsigned past_temp15_12; + unsigned inten; + unsigned intstat; + unsigned intclear; + unsigned rsvd15; + unsigned emul_con; +}; +#endif /* __ASM_ARCH_THERMAL_H */ diff --git a/drivers/power/Makefile b/drivers/power/Makefile index 8c71901..1dac16a 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk

LIB := $(obj)libpower.o

+COBJS-$(CONFIG_EXYNOS_TMU) += exynos-tmu.o COBJS-$(CONFIG_FTPMU010_POWER) += ftpmu010.o COBJS-$(CONFIG_TPS6586X_POWER) += tps6586x.o COBJS-$(CONFIG_TWL4030_POWER) += twl4030.o diff --git a/drivers/power/exynos-tmu.c b/drivers/power/exynos-tmu.c new file mode 100644 index 0000000..83a2572 --- /dev/null +++ b/drivers/power/exynos-tmu.c @@ -0,0 +1,302 @@ +/* + * Copyright (c) 2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * Akshay Saraswat akshay.s@samsung.com + * + * EXYNOS - Thermal Management Unit + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <errno.h> +#include <fdtdec.h> +#include <tmu.h> +#include <asm/arch/exynos-tmu.h> + +#define TRIMINFO_RELOAD 1 +#define CORE_EN 1 + +#define INTEN_RISE0 1 +#define INTEN_RISE1 (1 << 4) +#define INTEN_RISE2 (1 << 8) +#define INTEN_FALL0 (1 << 16) +#define INTEN_FALL1 (1 << 20) +#define INTEN_FALL2 (1 << 24) + +#define TRIM_INFO_MASK 0xff + +#define INTCLEAR_RISE0 1 +#define INTCLEAR_RISE1 (1 << 4) +#define INTCLEAR_RISE2 (1 << 8) +#define INTCLEAR_FALL0 (1 << 16) +#define INTCLEAR_FALL1 (1 << 20) +#define INTCLEAR_FALL2 (1 << 24) +#define INTCLEARALL (INTCLEAR_RISE0 | INTCLEAR_RISE1 | \ + INTCLEAR_RISE2 | INTCLEAR_FALL0 | \ + INTCLEAR_FALL1 | INTCLEAR_FALL2) + +/* Tmeperature threshold values for various thermal events */ +struct temperature_params { + /* minimum value in temperature code range */ + unsigned int min_val; + /* maximum value in temperature code range */ + unsigned int max_val; + /* temperature threshold to start warning */ + unsigned int start_warning; + /* temperature threshold CPU tripping */ + unsigned int start_tripping; +}; + +/* Pre-defined values and thresholds for calibration of current temperature */ +struct tmu_data { + /* pre-defined temperature thresholds */ + struct temperature_params ts; + /* pre-defined efuse range minimum value */ + unsigned int efuse_min_value; + /* pre-defined efuse value for temperature calibration */ + unsigned int efuse_value; + /* pre-defined efuse range maximum value */ + unsigned int efuse_max_value; + /* current temperature sensing slope */ + unsigned int slope; +}; + +/* TMU device specific details and status */ +struct tmu_info { + /* base Address for the TMU */ + unsigned tmu_base; + /* pre-defined values for calibration and thresholds */ + struct tmu_data data; + /* value required for triminfo_25 calibration */ + unsigned int te1; + /* value required for triminfo_85 calibration */ + unsigned int te2; + /* Value for measured data calibration */ + int dc_value; + /* enum value indicating status of the TMU */ + int tmu_state; +}; + +/* Global struct tmu_info variable to store init values */ +static struct tmu_info gbl_info; + +/* + * Get current temperature code from register, + * then calculate and calibrate it's value + * in degree celsius. + * + * @return current temperature of the chip as sensed by TMU + */ +int get_cur_temp(struct tmu_info *info) +{ + int cur_temp; + struct tmu_reg *reg = (struct tmu_reg *)info->tmu_base; + + /* + * Temperature code range between min 25 and max 125. + * May run more than once for first call as initial sensing + * has not yet happened. + */ + do { + cur_temp = readl(&reg->current_temp) & 0xff; + } while (cur_temp == 0 && info->tmu_state == TMU_STATUS_NORMAL); + + /* Calibrate current temperature */ + cur_temp = cur_temp - info->te1 + info->dc_value; + + return cur_temp; +} + +/* + * Monitors status of the TMU device and exynos temperature + * + * @param temp pointer to the current temperature value + * @return enum tmu_status_t value, code indicating event to execute + */ +enum tmu_status_t tmu_monitor(int *temp) +{ + if (gbl_info.tmu_state == TMU_STATUS_INIT) + return TMU_STATUS_INIT; + + int cur_temp; + struct tmu_data *data = &gbl_info.data; + + /* Read current temperature of the SOC */ + cur_temp = get_cur_temp(&gbl_info); + *temp = cur_temp; + + /* Temperature code lies between min 25 and max 125 */ + if (cur_temp >= data->ts.start_tripping && + cur_temp <= data->ts.max_val) { + return TMU_STATUS_TRIPPED; + } else if (cur_temp >= data->ts.start_warning) { + return TMU_STATUS_WARNING; + } else if (cur_temp < data->ts.start_warning && + cur_temp >= data->ts.min_val) { + return TMU_STATUS_NORMAL; + /* Temperature code does not lie between min 25 and max 125 */ + } else { + gbl_info.tmu_state = TMU_STATUS_INIT; + debug("EXYNOS_TMU: Thermal reading failed\n"); + return TMU_STATUS_INIT; + } +} + +/* + * Get TMU specific pre-defined values from FDT + * + * @param info pointer to the tmu_info struct + * @param blob FDT blob + * @return int value, 0 for success + */ +int get_tmu_fdt_values(struct tmu_info *info, const void *blob) +{ + int node; + int error = 0; + + /* Get the node from FDT for TMU */ + node = fdtdec_next_compatible(blob, 0, + COMPAT_SAMSUNG_EXYNOS_TMU); + if (node < 0) { + debug("EXYNOS_TMU: No node for tmu in device tree\n"); + return -1; + } + + /* + * Get the pre-defined TMU specific values from FDT. + * All of these are expected to be correct otherwise + * miscalculation of register values in tmu_setup_parameters + * may result in misleading current temperature. + */ + info->tmu_base = fdtdec_get_addr(blob, node, "reg"); + if (info->tmu_base == FDT_ADDR_T_NONE) { + debug("%s: Missing tmu-base\n", __func__); + return -1; + } + info->data.ts.min_val = fdtdec_get_int(blob, + node, "samsung,min-temp", -1); + error |= info->data.ts.min_val; + info->data.ts.max_val = fdtdec_get_int(blob, + node, "samsung,max-temp", -1); + error |= info->data.ts.max_val; + info->data.ts.start_warning = fdtdec_get_int(blob, + node, "samsung,start-warning", -1); + error |= info->data.ts.start_warning; + info->data.ts.start_tripping = fdtdec_get_int(blob, + node, "samsung,start-tripping", -1); + error |= info->data.ts.start_tripping; + info->data.efuse_min_value = fdtdec_get_int(blob, + node, "samsung,efuse-min-value", -1); + error |= info->data.efuse_min_value; + info->data.efuse_value = fdtdec_get_int(blob, + node, "samsung,efuse-value", -1); + error |= info->data.efuse_value; + info->data.efuse_max_value = fdtdec_get_int(blob, + node, "samsung,efuse-max-value", -1); + error |= info->data.efuse_max_value; + info->data.slope = fdtdec_get_int(blob, + node, "samsung,slope", -1); + error |= info->data.slope; + info->dc_value = fdtdec_get_int(blob, + node, "samsung,dc-value", -1); + error |= info->dc_value; + + if (error == -1) { + debug("fail to get tmu node properties\n"); + return -1; + } + + return 0; +} + +/* + * Calibrate and calculate threshold values and + * enable interrupt levels + * + * @param info pointer to the tmu_info struct + */ +void tmu_setup_parameters(struct tmu_info *info) +{ + unsigned int te_temp, con; + unsigned int warning_temp, trip_temp; + unsigned int cooling_temp; + unsigned int rising_value; + struct tmu_data *data = &info->data; + struct tmu_reg *reg = (struct tmu_reg *)info->tmu_base; + + /* Must reload for reading efuse value from triminfo register */ + writel(TRIMINFO_RELOAD, &reg->triminfo_control); + + /* Get the compensation parameter */ + te_temp = readl(&reg->triminfo); + info->te1 = te_temp & TRIM_INFO_MASK; + info->te2 = ((te_temp >> 8) & TRIM_INFO_MASK); + + if ((data->efuse_min_value > info->te1) || + (info->te1 > data->efuse_max_value) + || (info->te2 != 0)) + info->te1 = data->efuse_value; + + /* Get RISING & FALLING Threshold value */ + warning_temp = data->ts.start_warning + + info->te1 - info->dc_value; + trip_temp = data->ts.start_tripping + + info->te1 - info->dc_value; + cooling_temp = 0; + + rising_value = ((warning_temp << 8) | (trip_temp << 16)); + + /* Set interrupt level */ + writel(rising_value, &reg->threshold_temp_rise); + writel(cooling_temp, &reg->threshold_temp_fall); + + /* + * Init TMU control tuning parameters + * [28:24] VREF - Voltage reference + * [15:13] THERM_TRIP_MODE - Tripping mode + * [12] THERM_TRIP_EN - Thermal tripping enable + * [11:8] BUF_SLOPE_SEL - Gain of amplifier + * [6] THERM_TRIP_BY_TQ_EN - Tripping by TQ pin + */ + writel(data->slope, &reg->tmu_control); + + writel(INTCLEARALL, &reg->intclear); + + /* TMU core enable */ + con = readl(&reg->tmu_control); + con |= CORE_EN; + + writel(con, &reg->tmu_control); + + /* LEV0 LEV1 LEV2 interrupt enable */ + writel(INTEN_RISE0 | INTEN_RISE1 | INTEN_RISE2, &reg->inten); +} + +/* + * Initialize TMU device + * + * @param blob FDT blob + * @return int value, 0 for success + */ +int tmu_init(const void *blob) +{ + gbl_info.tmu_state = TMU_STATUS_INIT; + if (get_tmu_fdt_values(&gbl_info, blob) < 0) + return -1; + + tmu_setup_parameters(&gbl_info); + gbl_info.tmu_state = TMU_STATUS_NORMAL; + debug("EXYNOS_TMU: Available\n"); + + return 0; +} diff --git a/include/tmu.h b/include/tmu.h new file mode 100644 index 0000000..17e9a85 --- /dev/null +++ b/include/tmu.h @@ -0,0 +1,46 @@ +/* + * Copyright (c) 2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * Akshay Saraswat akshay.s@samsung.com + * + * Thermal Management Unit + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef _TMU_H +#define _TMU_H + +enum tmu_status_t { + TMU_STATUS_INIT = 0, + TMU_STATUS_NORMAL, + TMU_STATUS_WARNING, + TMU_STATUS_TRIPPED, +}; + +/* + * Monitors status of the TMU device and exynos temperature + * + * @param temp pointer to the current temperature value + * @return enum tmu_status_t value, code indicating event to execute + * and -1 on error + */ +enum tmu_status_t tmu_monitor(int *temp); + +/* + * Initialize TMU device + * + * @param blob FDT blob + * @return int value, 0 for success + */ +int tmu_init(const void *blob); +#endif /* _THERMAL_H_ */

Fdt entry for Exynos TMU driver specific pre-defined values used for calibration of current temperature and defining threshold values.

Signed-off-by: Akshay Saraswat akshay.s@samsung.com Acked-by: Simon Glass sjg@chromium.org --- Changes since v5: - Added Acked-by. - Changed size from 0xffff to 0x10000. - Removed tmu_mux entry from TMU node since it is no more required. - Changed TMU node entry descriptions and added units to them.

arch/arm/dts/exynos5250.dtsi | 5 ++++ board/samsung/dts/exynos5250-smdk5250.dts | 12 ++++++++ doc/device-tree-bindings/exynos/tmu.txt | 46 +++++++++++++++++++++++++++++ include/fdtdec.h | 1 + lib/fdtdec.c | 1 + 5 files changed, 65 insertions(+) create mode 100644 doc/device-tree-bindings/exynos/tmu.txt

diff --git a/arch/arm/dts/exynos5250.dtsi b/arch/arm/dts/exynos5250.dtsi index ed8c8dd..61d35a8 100644 --- a/arch/arm/dts/exynos5250.dtsi +++ b/arch/arm/dts/exynos5250.dtsi @@ -151,4 +151,9 @@ }; };

+ tmu@10060000 { + compatible = "samsung,exynos-tmu"; + reg = <0x10060000 0x10000>; + }; + }; diff --git a/board/samsung/dts/exynos5250-smdk5250.dts b/board/samsung/dts/exynos5250-smdk5250.dts index cbfab6f..00dac40 100644 --- a/board/samsung/dts/exynos5250-smdk5250.dts +++ b/board/samsung/dts/exynos5250-smdk5250.dts @@ -66,4 +66,16 @@ compatible = "maxim,max77686_pmic"; }; }; + + tmu@10060000 { + samsung,min-temp = <25>; + samsung,max-temp = <125>; + samsung,start-warning = <95>; + samsung,start-tripping = <105>; + samsung,efuse-min-value = <40>; + samsung,efuse-value = <55>; + samsung,efuse-max-value = <100>; + samsung,slope = <274761730>; + samsung,dc-value = <25>; + }; }; diff --git a/doc/device-tree-bindings/exynos/tmu.txt b/doc/device-tree-bindings/exynos/tmu.txt new file mode 100644 index 0000000..96c2598 --- /dev/null +++ b/doc/device-tree-bindings/exynos/tmu.txt @@ -0,0 +1,46 @@ +Exynos Thermal management Unit + +The device node for TMU that is a part of Exynos5250 +SOC is as described in the document "Open Firmware Recommended +Practice : Universal Serial Bus" with the following modifications +and additions: + +Required properties: + + - compatible : Should be "samsung,exynos-tmu" for TMU + - samsung,min-temp : Minimum temperature value (25 degree celsius) + - Current temperature of SoC should be more than this value. + - samsung,max-temp : Maximum temperature value (125 degree celsius) + - Current temperature of SoC should be less than this value. + - samsung,start-warning : Temperature at which TMU starts giving warning (degree celsius) + - samsung,start-tripping : Temperature at which system will trip and shutdown (degree celsius) + - samsung,efuse-min-value : SOC efuse min value (Constant 40) + - efuse-value should be more than this value. + - samsung,efuse-value : SOC actual efuse value (Literal value) + - This is the data trimming info. + - This value is used to calculate measuring error. + - samsung,efuse-max-value : SoC max efuse value (Constant 100) + - efuse-value should be less than this value. + - samsung,slope : Default value 274761730 (Constant 0x1060_8802). + - This is the default value for TMU_CONTROL register. + - It sets the gain of amplifier to the positive-tc generator block. + - It selects thermal tripping mode and enables thermal tripping. + - samsung,dc-value : Measured data calibration value (Constant 25) + - Used for tempearture calculation. + - This is 25 because temperature measured is always above 25 degrees. + + +Example: + +tmu@10060000 { + compatible = "samsung,exynos-tmu" + samsung,min-temp = <25>; + samsung,max-temp = <125>; + samsung,start-warning = <95>; + samsung,start-tripping = <105>; + samsung,efuse-min-value = <40>; + samsung,efuse-value = <55>; + samsung,efuse-max-value = <100>; + samsung,slope = <274761730>; + samsung,dc-value = <25>; +}; diff --git a/include/fdtdec.h b/include/fdtdec.h index f77d195..058fb51 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -79,6 +79,7 @@ enum fdt_compat_id { COMPAT_SAMSUNG_EXYNOS_EHCI, /* Exynos EHCI controller */ COMPAT_SAMSUNG_EXYNOS_USB_PHY, /* Exynos phy controller for usb2.0 */ COMPAT_MAXIM_MAX77686_PMIC, /* MAX77686 PMIC */ + COMPAT_SAMSUNG_EXYNOS_TMU, /* Exynos TMU */

COMPAT_COUNT, }; diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 16921e1..4613fcd 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -54,6 +54,7 @@ static const char * const compat_names[COMPAT_COUNT] = { COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"), COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"), COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"), + COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"), };

const char *fdtdec_get_compatible(enum fdt_compat_id id)

Enables TMU driver support for exynos5250

Signed-off-by: Akshay Saraswat akshay.s@samsung.com Acked-by: Simon Glass sjg@chromium.org --- Changes since v5: - Added Acked-by.

include/configs/exynos5250-dt.h | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/include/configs/exynos5250-dt.h b/include/configs/exynos5250-dt.h index cabd2f2..53ca41f 100644 --- a/include/configs/exynos5250-dt.h +++ b/include/configs/exynos5250-dt.h @@ -117,6 +117,9 @@ #define CONFIG_BOOTDELAY 3 #define CONFIG_ZERO_BOOTDELAY_CHECK

+/* Thermal Management Unit */ +#define CONFIG_EXYNOS_TMU + /* USB */ #define CONFIG_CMD_USB #define CONFIG_USB_EHCI

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

Signed-off-by: Akshay Saraswat akshay.s@samsung.com --- Changes since v5: - New patch.

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..d1d65e1 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 poweroff 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..f14d19e 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 poweroff 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_temp, con; - unsigned int warning_temp, trip_temp; + unsigned int warning_temp, trip_temp, hwtrip_temp; 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_temp = data->ts.start_tripping + info->te1 - info->dc_value; + hwtrip_temp = data->ts.hardware_tripping + + info->te1 - info->dc_value; + cooling_temp = 0;

- rising_value = ((warning_temp << 8) | (trip_temp << 16)); + rising_value = ((warning_temp << 8) | + (trip_temp << 16) | + (hwtrip_temp << 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); }

/*

This adds a member to TMU FDT node for providing hardware tripping temperature threshold.

Signed-off-by: Akshay Saraswat akshay.s@samsung.com --- Changes since v5: - New patch.

board/samsung/dts/exynos5250-smdk5250.dts | 1 + doc/device-tree-bindings/exynos/tmu.txt | 5 ++++- 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/board/samsung/dts/exynos5250-smdk5250.dts b/board/samsung/dts/exynos5250-smdk5250.dts index 00dac40..1c2d52d 100644 --- a/board/samsung/dts/exynos5250-smdk5250.dts +++ b/board/samsung/dts/exynos5250-smdk5250.dts @@ -72,6 +72,7 @@ samsung,max-temp = <125>; samsung,start-warning = <95>; samsung,start-tripping = <105>; + samsung,hw-tripping = <110>; samsung,efuse-min-value = <40>; samsung,efuse-value = <55>; samsung,efuse-max-value = <100>; diff --git a/doc/device-tree-bindings/exynos/tmu.txt b/doc/device-tree-bindings/exynos/tmu.txt index 779b01c..424395e 100644 --- a/doc/device-tree-bindings/exynos/tmu.txt +++ b/doc/device-tree-bindings/exynos/tmu.txt @@ -13,7 +13,9 @@ Required properties: - samsung,max-temp : Maximum temperature value (125 degree celsius) - Current temperature of SoC should be less than this value. - samsung,start-warning : Temperature at which TMU starts giving warning (degree celsius) - - samsung,start-tripping : Temperature at which system will trip and shutdown (degree celsius) + - samsung,start-tripping : Temperature at which TMU shutdowns the system (degree celsius) + - samsung,hw-tripping : Temperature at which hardware tripping should happen + in case TMU fails to poweroff (degree celsius) - samsung,efuse-min-value : SOC efuse min value (Constant 40) - efuse-value should be more than this value. - samsung,efuse-value : SOC actual efuse value (Literal value) @@ -38,6 +40,7 @@ tmu@10060000 { samsung,max-temp = <125>; samsung,start-warning = <95>; samsung,start-tripping = <105>; + samsung,hw-tripping = <110>; samsung,efuse-min-value = <40>; samsung,efuse-value = <55>; samsung,efuse-max-value = <100>;