diff options
Diffstat (limited to 'drivers/power/exynos-tmu.c')
| -rw-r--r-- | drivers/power/exynos-tmu.c | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/drivers/power/exynos-tmu.c b/drivers/power/exynos-tmu.c new file mode 100644 index 0000000000..d4b3e65a3e --- /dev/null +++ b/drivers/power/exynos-tmu.c @@ -0,0 +1,319 @@ +/* + * 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/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) +#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; + /* temperature threshold for HW tripping */ + unsigned int hardware_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 + */ +static int get_cur_temp(struct tmu_info *info) +{ + int cur_temp; + struct exynos5_tmu_reg *reg = (struct exynos5_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(®->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) +{ + int cur_temp; + struct tmu_data *data = &gbl_info.data; + + if (gbl_info.tmu_state == TMU_STATUS_INIT) + return TMU_STATUS_INIT; + + /* 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; + } else { + /* Temperature code does not lie between min 25 and max 125 */ + 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 + */ +static int get_tmu_fdt_values(struct tmu_info *info, const void *blob) +{ +#ifdef CONFIG_OF_CONTROL + 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.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; + 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; + } +#endif + + return 0; +} + +/* + * Calibrate and calculate threshold values and + * enable interrupt levels + * + * @param info pointer to the tmu_info struct + */ +static void tmu_setup_parameters(struct tmu_info *info) +{ + unsigned int te_code, con; + unsigned int warning_code, trip_code, hwtrip_code; + unsigned int cooling_temp; + unsigned int rising_value; + struct tmu_data *data = &info->data; + struct exynos5_tmu_reg *reg = (struct exynos5_tmu_reg *)info->tmu_base; + + /* Must reload for reading efuse value from triminfo register */ + writel(TRIMINFO_RELOAD, ®->triminfo_control); + + /* Get the compensation parameter */ + te_code = readl(®->triminfo); + info->te1 = te_code & TRIM_INFO_MASK; + info->te2 = ((te_code >> 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_code = data->ts.start_warning + + 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) | + (hwtrip_code << 24)); + + /* Set interrupt level */ + writel(rising_value, ®->threshold_temp_rise); + writel(cooling_temp, ®->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, ®->tmu_control); + + writel(INTCLEARALL, ®->intclear); + + /* TMU core enable */ + con = readl(®->tmu_control); + con |= THERM_TRIP_EN | CORE_EN; + + writel(con, ®->tmu_control); + + /* Enable HW thermal trip */ + set_hw_thermal_trip(); + + /* LEV1 LEV2 interrupt enable */ + writel(INTEN_RISE1 | INTEN_RISE2, ®->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) + goto ret; + + tmu_setup_parameters(&gbl_info); + gbl_info.tmu_state = TMU_STATUS_NORMAL; +ret: + + return gbl_info.tmu_state; +} |