/*
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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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#include <asm/arch/power.h>
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#define TRIMINFO_RELOAD 1
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#define CORE_EN 1
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#define THERM_TRIP_EN (1 << 12)
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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 min_val;
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/* maximum value in temperature code range */
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unsigned max_val;
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/* temperature threshold to start warning */
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unsigned start_warning;
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/* temperature threshold CPU tripping */
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unsigned start_tripping;
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/* temperature threshold for HW tripping */
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unsigned hardware_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 efuse_min_value;
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/* pre-defined efuse value for temperature calibration */
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unsigned efuse_value;
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/* pre-defined efuse range maximum value */
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unsigned efuse_max_value;
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/* current temperature sensing slope */
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unsigned 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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struct exynos5_tmu_reg *tmu_base;
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/* mux Address for the TMU */
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int tmu_mux;
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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 te1;
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/* value required for triminfo_85 calibration */
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unsigned 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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struct exynos5_tmu_reg *reg = info->tmu_base;
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ulong start;
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int cur_temp = 0;
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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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if (info->tmu_state == TMU_STATUS_NORMAL) {
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start = get_timer(0);
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do {
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cur_temp = readl(®->current_temp) & 0xff;
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} while ((cur_temp == 0) || (get_timer(start) > 100));
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}
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if (cur_temp == 0)
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return cur_temp;
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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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if (!cur_temp)
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goto out;
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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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if (cur_temp >= data->ts.start_warning)
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return TMU_STATUS_WARNING;
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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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out:
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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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* 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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#if CONFIG_IS_ENABLED(OF_CONTROL)
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fdt_addr_t addr;
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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 -ENODEV;
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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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addr = fdtdec_get_addr(blob, node, "reg");
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if (addr == FDT_ADDR_T_NONE) {
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debug("%s: Missing tmu-base\n", __func__);
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return -ENODEV;
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}
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info->tmu_base = (struct exynos5_tmu_reg *)addr;
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/* Optional field. */
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info->tmu_mux = fdtdec_get_int(blob,
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node, "samsung,mux", -1);
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/* Take default value as per the user manual b(110) */
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if (info->tmu_mux == -1)
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info->tmu_mux = 0x6;
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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 == -1);
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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 == -1);
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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 == -1);
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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 == -1);
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info->data.ts.hardware_tripping = fdtdec_get_int(blob,
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node, "samsung,hw-tripping", -1);
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error |= (info->data.ts.hardware_tripping == -1);
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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 == -1);
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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 == -1);
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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 == -1);
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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 == -1);
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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 == -1);
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if (error) {
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debug("fail to get tmu node properties\n");
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return -EINVAL;
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}
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#else
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/* Non DT support may never be added. Just in case */
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return -ENODEV;
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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 te_code, con;
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unsigned warning_code, trip_code, hwtrip_code;
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unsigned cooling_temp;
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unsigned rising_value;
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struct tmu_data *data = &info->data;
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struct exynos5_tmu_reg *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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hwtrip_code = data->ts.hardware_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) |
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(trip_code << 16) |
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(hwtrip_code << 24));
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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 |= THERM_TRIP_EN | CORE_EN | (info->tmu_mux << 20);
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writel(con, ®->tmu_control);
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/* Enable HW thermal trip */
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set_hw_thermal_trip();
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/* LEV1 LEV2 interrupt enable */
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writel(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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