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Exynos5: TMU: Add driver for Thermal Management Unit
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> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Akshay Saraswat
Minkyu Kang
parent
07f17507c4
commit
39d182d3de
4 changed files with 409 additions and 0 deletions
58
arch/arm/include/asm/arch-exynos/tmu.h
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58
arch/arm/include/asm/arch-exynos/tmu.h
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@ -0,0 +1,58 @@
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/*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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* Akshay Saraswat <akshay.s@samsung.com>
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*
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* EXYNOS - Thermal Management Unit
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __ASM_ARCH_TMU_H
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#define __ASM_ARCH_TMU_H
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struct exynos5_tmu_reg {
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unsigned triminfo;
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unsigned rsvd1;
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unsigned rsvd2;
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unsigned rsvd3;
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unsigned rsvd4;
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unsigned triminfo_control;
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unsigned rsvd5;
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unsigned rsvd6;
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unsigned tmu_control;
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unsigned rsvd7;
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unsigned tmu_status;
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unsigned sampling_internal;
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unsigned counter_value0;
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unsigned counter_value1;
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unsigned rsvd8;
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unsigned rsvd9;
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unsigned current_temp;
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unsigned rsvd10;
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unsigned rsvd11;
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unsigned rsvd12;
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unsigned threshold_temp_rise;
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unsigned threshold_temp_fall;
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unsigned rsvd13;
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unsigned rsvd14;
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unsigned past_temp3_0;
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unsigned past_temp7_4;
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unsigned past_temp11_8;
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unsigned past_temp15_12;
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unsigned inten;
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unsigned intstat;
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unsigned intclear;
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unsigned rsvd15;
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unsigned emul_con;
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};
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#endif /* __ASM_ARCH_TMU_H */
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@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk
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LIB := $(obj)libpower.o
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COBJS-$(CONFIG_EXYNOS_TMU) += exynos-tmu.o
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COBJS-$(CONFIG_FTPMU010_POWER) += ftpmu010.o
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COBJS-$(CONFIG_TPS6586X_POWER) += tps6586x.o
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COBJS-$(CONFIG_TWL4030_POWER) += twl4030.o
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304
drivers/power/exynos-tmu.c
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304
drivers/power/exynos-tmu.c
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@ -0,0 +1,304 @@
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/*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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* Akshay Saraswat <akshay.s@samsung.com>
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*
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* EXYNOS - Thermal Management Unit
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <tmu.h>
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#include <asm/arch/tmu.h>
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#define TRIMINFO_RELOAD 1
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#define CORE_EN 1
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#define INTEN_RISE0 1
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#define INTEN_RISE1 (1 << 4)
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#define INTEN_RISE2 (1 << 8)
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#define INTEN_FALL0 (1 << 16)
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#define INTEN_FALL1 (1 << 20)
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#define INTEN_FALL2 (1 << 24)
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#define TRIM_INFO_MASK 0xff
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#define INTCLEAR_RISE0 1
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#define INTCLEAR_RISE1 (1 << 4)
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#define INTCLEAR_RISE2 (1 << 8)
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#define INTCLEAR_FALL0 (1 << 16)
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#define INTCLEAR_FALL1 (1 << 20)
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#define INTCLEAR_FALL2 (1 << 24)
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#define INTCLEARALL (INTCLEAR_RISE0 | INTCLEAR_RISE1 | \
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INTCLEAR_RISE2 | INTCLEAR_FALL0 | \
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INTCLEAR_FALL1 | INTCLEAR_FALL2)
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/* Tmeperature threshold values for various thermal events */
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struct temperature_params {
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/* minimum value in temperature code range */
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unsigned int min_val;
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/* maximum value in temperature code range */
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unsigned int max_val;
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/* temperature threshold to start warning */
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unsigned int start_warning;
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/* temperature threshold CPU tripping */
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unsigned int start_tripping;
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};
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/* Pre-defined values and thresholds for calibration of current temperature */
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struct tmu_data {
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/* pre-defined temperature thresholds */
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struct temperature_params ts;
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/* pre-defined efuse range minimum value */
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unsigned int efuse_min_value;
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/* pre-defined efuse value for temperature calibration */
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unsigned int efuse_value;
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/* pre-defined efuse range maximum value */
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unsigned int efuse_max_value;
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/* current temperature sensing slope */
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unsigned int slope;
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};
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/* TMU device specific details and status */
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struct tmu_info {
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/* base Address for the TMU */
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unsigned tmu_base;
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/* pre-defined values for calibration and thresholds */
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struct tmu_data data;
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/* value required for triminfo_25 calibration */
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unsigned int te1;
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/* value required for triminfo_85 calibration */
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unsigned int te2;
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/* Value for measured data calibration */
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int dc_value;
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/* enum value indicating status of the TMU */
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int tmu_state;
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};
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/* Global struct tmu_info variable to store init values */
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static struct tmu_info gbl_info;
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/*
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* Get current temperature code from register,
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* then calculate and calibrate it's value
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* in degree celsius.
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*
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* @return current temperature of the chip as sensed by TMU
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*/
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static int get_cur_temp(struct tmu_info *info)
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{
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int cur_temp;
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struct exynos5_tmu_reg *reg = (struct exynos5_tmu_reg *)info->tmu_base;
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/*
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* Temperature code range between min 25 and max 125.
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* May run more than once for first call as initial sensing
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* has not yet happened.
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*/
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do {
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cur_temp = readl(®->current_temp) & 0xff;
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} while (cur_temp == 0 && info->tmu_state == TMU_STATUS_NORMAL);
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/* Calibrate current temperature */
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cur_temp = cur_temp - info->te1 + info->dc_value;
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return cur_temp;
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}
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/*
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* Monitors status of the TMU device and exynos temperature
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*
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* @param temp pointer to the current temperature value
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* @return enum tmu_status_t value, code indicating event to execute
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*/
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enum tmu_status_t tmu_monitor(int *temp)
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{
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int cur_temp;
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struct tmu_data *data = &gbl_info.data;
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if (gbl_info.tmu_state == TMU_STATUS_INIT)
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return TMU_STATUS_INIT;
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/* Read current temperature of the SOC */
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cur_temp = get_cur_temp(&gbl_info);
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*temp = cur_temp;
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/* Temperature code lies between min 25 and max 125 */
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if (cur_temp >= data->ts.start_tripping &&
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cur_temp <= data->ts.max_val) {
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return TMU_STATUS_TRIPPED;
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} else if (cur_temp >= data->ts.start_warning) {
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return TMU_STATUS_WARNING;
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} else if (cur_temp < data->ts.start_warning &&
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cur_temp >= data->ts.min_val) {
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return TMU_STATUS_NORMAL;
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} else {
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/* Temperature code does not lie between min 25 and max 125 */
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gbl_info.tmu_state = TMU_STATUS_INIT;
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debug("EXYNOS_TMU: Thermal reading failed\n");
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return TMU_STATUS_INIT;
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}
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}
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/*
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* Get TMU specific pre-defined values from FDT
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*
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* @param info pointer to the tmu_info struct
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* @param blob FDT blob
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* @return int value, 0 for success
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*/
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static int get_tmu_fdt_values(struct tmu_info *info, const void *blob)
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{
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#ifdef CONFIG_OF_CONTROL
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int node;
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int error = 0;
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/* Get the node from FDT for TMU */
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node = fdtdec_next_compatible(blob, 0,
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COMPAT_SAMSUNG_EXYNOS_TMU);
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if (node < 0) {
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debug("EXYNOS_TMU: No node for tmu in device tree\n");
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return -1;
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}
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/*
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* Get the pre-defined TMU specific values from FDT.
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* All of these are expected to be correct otherwise
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* miscalculation of register values in tmu_setup_parameters
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* may result in misleading current temperature.
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*/
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info->tmu_base = fdtdec_get_addr(blob, node, "reg");
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if (info->tmu_base == FDT_ADDR_T_NONE) {
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debug("%s: Missing tmu-base\n", __func__);
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return -1;
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}
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info->data.ts.min_val = fdtdec_get_int(blob,
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node, "samsung,min-temp", -1);
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error |= info->data.ts.min_val;
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info->data.ts.max_val = fdtdec_get_int(blob,
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node, "samsung,max-temp", -1);
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error |= info->data.ts.max_val;
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info->data.ts.start_warning = fdtdec_get_int(blob,
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node, "samsung,start-warning", -1);
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error |= info->data.ts.start_warning;
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info->data.ts.start_tripping = fdtdec_get_int(blob,
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node, "samsung,start-tripping", -1);
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error |= info->data.ts.start_tripping;
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info->data.efuse_min_value = fdtdec_get_int(blob,
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node, "samsung,efuse-min-value", -1);
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error |= info->data.efuse_min_value;
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info->data.efuse_value = fdtdec_get_int(blob,
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node, "samsung,efuse-value", -1);
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error |= info->data.efuse_value;
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info->data.efuse_max_value = fdtdec_get_int(blob,
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node, "samsung,efuse-max-value", -1);
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error |= info->data.efuse_max_value;
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info->data.slope = fdtdec_get_int(blob,
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node, "samsung,slope", -1);
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error |= info->data.slope;
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info->dc_value = fdtdec_get_int(blob,
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node, "samsung,dc-value", -1);
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error |= info->dc_value;
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if (error == -1) {
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debug("fail to get tmu node properties\n");
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return -1;
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}
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#endif
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return 0;
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}
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/*
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* Calibrate and calculate threshold values and
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* enable interrupt levels
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*
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* @param info pointer to the tmu_info struct
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*/
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static void tmu_setup_parameters(struct tmu_info *info)
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{
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unsigned int te_code, con;
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unsigned int warning_code, trip_code;
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unsigned int cooling_temp;
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unsigned int rising_value;
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struct tmu_data *data = &info->data;
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struct exynos5_tmu_reg *reg = (struct exynos5_tmu_reg *)info->tmu_base;
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/* Must reload for reading efuse value from triminfo register */
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writel(TRIMINFO_RELOAD, ®->triminfo_control);
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/* Get the compensation parameter */
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te_code = readl(®->triminfo);
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info->te1 = te_code & TRIM_INFO_MASK;
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info->te2 = ((te_code >> 8) & TRIM_INFO_MASK);
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if ((data->efuse_min_value > info->te1) ||
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(info->te1 > data->efuse_max_value)
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|| (info->te2 != 0))
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info->te1 = data->efuse_value;
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/* Get RISING & FALLING Threshold value */
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warning_code = data->ts.start_warning
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+ info->te1 - info->dc_value;
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trip_code = data->ts.start_tripping
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+ info->te1 - info->dc_value;
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cooling_temp = 0;
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rising_value = ((warning_code << 8) | (trip_code << 16));
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/* Set interrupt level */
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writel(rising_value, ®->threshold_temp_rise);
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writel(cooling_temp, ®->threshold_temp_fall);
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/*
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* Init TMU control tuning parameters
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* [28:24] VREF - Voltage reference
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* [15:13] THERM_TRIP_MODE - Tripping mode
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* [12] THERM_TRIP_EN - Thermal tripping enable
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* [11:8] BUF_SLOPE_SEL - Gain of amplifier
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* [6] THERM_TRIP_BY_TQ_EN - Tripping by TQ pin
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*/
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writel(data->slope, ®->tmu_control);
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writel(INTCLEARALL, ®->intclear);
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/* TMU core enable */
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con = readl(®->tmu_control);
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con |= CORE_EN;
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writel(con, ®->tmu_control);
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/* LEV0 LEV1 LEV2 interrupt enable */
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writel(INTEN_RISE0 | INTEN_RISE1 | INTEN_RISE2, ®->inten);
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}
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/*
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* Initialize TMU device
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*
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* @param blob FDT blob
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* @return int value, 0 for success
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*/
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int tmu_init(const void *blob)
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{
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gbl_info.tmu_state = TMU_STATUS_INIT;
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if (get_tmu_fdt_values(&gbl_info, blob) < 0)
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goto ret;
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tmu_setup_parameters(&gbl_info);
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gbl_info.tmu_state = TMU_STATUS_NORMAL;
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ret:
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return gbl_info.tmu_state;
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}
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46
include/tmu.h
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46
include/tmu.h
Normal file
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@ -0,0 +1,46 @@
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/*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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* Akshay Saraswat <akshay.s@samsung.com>
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*
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* Thermal Management Unit
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
|
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* 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,
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* MA 02111-1307 USA
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*/
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#ifndef _TMU_H
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#define _TMU_H
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enum tmu_status_t {
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TMU_STATUS_INIT = -1,
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TMU_STATUS_NORMAL = 0,
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TMU_STATUS_WARNING,
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TMU_STATUS_TRIPPED,
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};
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/*
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* Monitors status of the TMU device and exynos temperature
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*
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* @param temp pointer to the current temperature value
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* @return enum tmu_status_t value, code indicating event to execute
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* and -1 on error
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*/
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enum tmu_status_t tmu_monitor(int *temp);
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/*
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* Initialize TMU device
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*
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* @param blob FDT blob
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* @return int value, 0 for success
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*/
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int tmu_init(const void *blob);
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#endif /* _THERMAL_H_ */
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