| /* |
| * Copyright 2013-2016 Freescale Semiconductor, Inc. |
| * |
| * 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. |
| * |
| */ |
| #include <linux/busfreq-imx.h> |
| #include <linux/clk.h> |
| #include <linux/cpu_cooling.h> |
| #include <linux/delay.h> |
| #include <linux/device.h> |
| #include <linux/device_cooling.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| #include <linux/mfd/syscon.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/platform_device.h> |
| #include <linux/regmap.h> |
| #include <linux/slab.h> |
| #include <linux/thermal.h> |
| #include <linux/types.h> |
| |
| #define REG_SET 0x4 |
| #define REG_CLR 0x8 |
| #define REG_TOG 0xc |
| |
| #define MISC0 0x0150 |
| #define MISC0_REFTOP_SELBIASOFF (1 << 3) |
| #define MISC1 0x0160 |
| #define MISC1_IRQ_TEMPHIGH (1 << 29) |
| /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */ |
| #define MISC1_IRQ_TEMPLOW (1 << 28) |
| #define MISC1_IRQ_TEMPPANIC (1 << 27) |
| |
| /* i.MX6 specific */ |
| #define IMX6_TEMPSENSE0 0X180 |
| #define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT 20 |
| #define IMX6_TEMPSENSE0_ALARM_VALUE_MASK (0xfff << 20) |
| #define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT 8 |
| #define IMX6_TEMPSENSE0_TEMP_CNT_MASK (0xfff << 8) |
| #define IMX6_TEMPSENSE0_FINISHED (1 << 2) |
| #define IMX6_TEMPSENSE0_MEASURE_TEMP (1 << 1) |
| #define IMX6_TEMPSENSE0_POWER_DOWN (1 << 0) |
| |
| #define IMX6_TEMPSENSE1 0X190 |
| #define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff |
| #define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 0 |
| |
| /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */ |
| #define TEMPSENSE2 0x0290 |
| #define TEMPSENSE2_LOW_VALUE_SHIFT 0 |
| #define TEMPSENSE2_LOW_VALUE_MASK 0xfff |
| #define TEMPSENSE2_PANIC_VALUE_SHIFT 16 |
| #define TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000 |
| |
| /* i.MX7D specific */ |
| #define IMX7_ANADIG_DIGPROG 0x800 |
| #define IMX7_TEMPSENSE0 0X300 |
| #define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT 18 |
| #define IMX7_TEMPSENSE0_PANIC_ALARM_MASK (0x1ff << 18) |
| #define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT 9 |
| #define IMX7_TEMPSENSE0_HIGH_ALARM_MASK (0x1ff << 9) |
| #define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT 0 |
| #define IMX7_TEMPSENSE0_LOW_ALARM_MASK 0x1ff |
| |
| #define IMX7_TEMPSENSE1 0X310 |
| #define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT 16 |
| #define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK (0xffff << 16) |
| #define IMX7_TEMPSENSE1_FINISHED (1 << 11) |
| #define IMX7_TEMPSENSE1_MEASURE_TEMP (1 << 10) |
| #define IMX7_TEMPSENSE1_POWER_DOWN (1 << 9) |
| #define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT 0 |
| #define IMX7_TEMPSENSE1_TEMP_VALUE_MASK 0x1ff |
| |
| #define IMX6_OCOTP_ANA1 0x04e0 |
| #define IMX7_OCOTP_ANA1 0x04f0 |
| |
| /* The driver supports 1 passive trip point and 1 critical trip point */ |
| enum imx_thermal_trip { |
| IMX_TRIP_PASSIVE, |
| IMX_TRIP_CRITICAL, |
| IMX_TRIP_NUM, |
| }; |
| |
| /* |
| * It defines the temperature in millicelsius for passive trip point |
| * that will trigger cooling action when crossed. |
| */ |
| #define IMX_TEMP_PASSIVE 85000 |
| #define IMX_TEMP_PASSIVE_COOL_DELTA 10000 |
| |
| #define IMX_POLLING_DELAY 2000 /* millisecond */ |
| #define IMX_PASSIVE_DELAY 1000 |
| |
| #define FACTOR0 10000000 |
| #define FACTOR1 15423 |
| #define FACTOR2 4148468 |
| #define OFFSET 3580661 |
| |
| #define TEMPMON_IMX6Q 1 |
| #define TEMPMON_IMX6SX 2 |
| #define TEMPMON_IMX7 3 |
| |
| /* the register offsets and bitfields may change across |
| * i.MX SOCs, use below struct as a description of the |
| * register. |
| */ |
| |
| struct thermal_soc_data { |
| u32 sensor_ctrl; /* tempmon sensor basic control */ |
| u32 power_down_mask; |
| u32 measure_temp_mask; |
| |
| u32 measure_freq_ctrl; |
| u32 measure_freq_mask; |
| u32 measure_freq_shift; |
| |
| u32 temp_data; |
| u32 temp_value_mask; |
| u32 temp_value_shift; |
| u32 temp_valid_mask; |
| |
| u32 panic_alarm_ctrl; |
| u32 panic_alarm_mask; |
| u32 panic_alarm_shift; |
| |
| u32 high_alarm_ctrl; |
| u32 high_alarm_mask; |
| u32 high_alarm_shift; |
| |
| u32 low_alarm_ctrl; |
| u32 low_alarm_mask; |
| u32 low_alarm_shift; |
| |
| u32 version; |
| }; |
| |
| static struct thermal_soc_data thermal_imx6q_data = { |
| .version = TEMPMON_IMX6Q, |
| |
| .sensor_ctrl = IMX6_TEMPSENSE0, |
| .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN, |
| .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP, |
| |
| .measure_freq_ctrl = IMX6_TEMPSENSE1, |
| .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT, |
| .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ, |
| |
| .temp_data = IMX6_TEMPSENSE0, |
| .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK, |
| .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT, |
| .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED, |
| |
| .high_alarm_ctrl = IMX6_TEMPSENSE0, |
| .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK, |
| .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT, |
| }; |
| |
| static struct thermal_soc_data thermal_imx6sx_data = { |
| .version = TEMPMON_IMX6SX, |
| |
| .sensor_ctrl = IMX6_TEMPSENSE0, |
| .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN, |
| .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP, |
| |
| .measure_freq_ctrl = IMX6_TEMPSENSE1, |
| .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT, |
| .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ, |
| |
| .temp_data = IMX6_TEMPSENSE0, |
| .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK, |
| .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT, |
| .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED, |
| |
| .high_alarm_ctrl = IMX6_TEMPSENSE0, |
| .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK, |
| .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT, |
| |
| .panic_alarm_ctrl = TEMPSENSE2, |
| .panic_alarm_mask = TEMPSENSE2_PANIC_VALUE_MASK, |
| .panic_alarm_shift = TEMPSENSE2_PANIC_VALUE_SHIFT, |
| }; |
| |
| static struct thermal_soc_data thermal_imx7d_data = { |
| .version = TEMPMON_IMX7, |
| |
| .sensor_ctrl = IMX7_TEMPSENSE1, |
| .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN, |
| .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP, |
| |
| .measure_freq_ctrl = IMX7_TEMPSENSE1, |
| .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT, |
| .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK, |
| |
| .temp_data = IMX7_TEMPSENSE1, |
| .temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK, |
| .temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT, |
| .temp_valid_mask = IMX7_TEMPSENSE1_FINISHED, |
| |
| .panic_alarm_ctrl = IMX7_TEMPSENSE1, |
| .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK, |
| .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT, |
| |
| .high_alarm_ctrl = IMX7_TEMPSENSE0, |
| .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK, |
| .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT, |
| |
| .low_alarm_ctrl = IMX7_TEMPSENSE0, |
| .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK, |
| .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT, |
| |
| }; |
| |
| struct imx_thermal_data { |
| struct thermal_zone_device *tz; |
| struct thermal_cooling_device *cdev[2]; |
| enum thermal_device_mode mode; |
| struct regmap *tempmon; |
| u32 c1, c2; /* See formula in imx_get_sensor_data() */ |
| unsigned long temp_passive; |
| unsigned long temp_critical; |
| unsigned long alarm_temp; |
| unsigned long last_temp; |
| bool irq_enabled; |
| int irq; |
| struct clk *thermal_clk; |
| struct mutex mutex; |
| const struct thermal_soc_data *socdata; |
| }; |
| |
| static struct imx_thermal_data *imx_thermal_data; |
| static int skip_finish_check; |
| |
| static void imx_set_panic_temp(struct imx_thermal_data *data, |
| signed long panic_temp) |
| { |
| const struct thermal_soc_data *soc_data = data->socdata; |
| struct regmap *map = data->tempmon; |
| int critical_value; |
| |
| if (data->socdata->version == TEMPMON_IMX7) |
| critical_value = panic_temp / 1000 + data->c1 - 25; |
| else |
| critical_value = (data->c2 - panic_temp) / data->c1; |
| |
| regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR, |
| soc_data->panic_alarm_mask); |
| regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET, |
| critical_value << soc_data->panic_alarm_shift); |
| } |
| |
| static void imx_set_alarm_temp(struct imx_thermal_data *data, |
| signed long alarm_temp) |
| { |
| const struct thermal_soc_data *soc_data = data->socdata; |
| struct regmap *map = data->tempmon; |
| int alarm_value; |
| |
| data->alarm_temp = alarm_temp; |
| |
| if (data->socdata->version == TEMPMON_IMX7) |
| alarm_value = alarm_temp / 1000 + data->c1 - 25; |
| else |
| alarm_value = (data->c2 - alarm_temp) / data->c1; |
| |
| regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR, |
| soc_data->high_alarm_mask); |
| regmap_write(map, soc_data->high_alarm_ctrl + REG_SET, |
| alarm_value << soc_data->high_alarm_shift); |
| } |
| |
| static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp) |
| { |
| struct imx_thermal_data *data = tz->devdata; |
| const struct thermal_soc_data *soc_data = data->socdata; |
| struct regmap *map = data->tempmon; |
| unsigned int n_meas; |
| bool wait; |
| u32 val; |
| |
| mutex_lock(&data->mutex); |
| if (data->mode == THERMAL_DEVICE_ENABLED) { |
| /* Check if a measurement is currently in progress */ |
| regmap_read(map, soc_data->temp_data, &val); |
| wait = !(val & soc_data->temp_valid_mask); |
| } else { |
| /* |
| * Every time we measure the temperature, we will power on the |
| * temperature sensor, enable measurements, take a reading, |
| * disable measurements, power off the temperature sensor. |
| */ |
| clk_prepare_enable(data->thermal_clk); |
| regmap_write(map, soc_data->sensor_ctrl + REG_CLR, |
| soc_data->power_down_mask); |
| regmap_write(map, soc_data->sensor_ctrl + REG_SET, |
| soc_data->measure_temp_mask); |
| |
| wait = true; |
| } |
| |
| /* |
| * According to the temp sensor designers, it may require up to ~17us |
| * to complete a measurement. |
| */ |
| if (wait) { |
| /* |
| * On i.MX7 TO1.0, the finish bit can only keep 1us after |
| * the measured data available. It is hard for software to |
| * polling this bit. So wait for 20ms to make sure the |
| * measured data is valid. |
| */ |
| if (data->socdata->version == TEMPMON_IMX7 && skip_finish_check) |
| msleep(20); |
| else |
| usleep_range(20, 50); |
| regmap_read(map, soc_data->temp_data, &val); |
| } |
| |
| if (data->mode != THERMAL_DEVICE_ENABLED) { |
| regmap_write(map, soc_data->sensor_ctrl + REG_CLR, |
| soc_data->measure_temp_mask); |
| regmap_write(map, soc_data->sensor_ctrl + REG_SET, |
| soc_data->power_down_mask); |
| clk_disable_unprepare(data->thermal_clk); |
| } |
| |
| if (!skip_finish_check && ((val & soc_data->temp_valid_mask) == 0)) { |
| dev_dbg(&tz->device, "temp measurement never finished\n"); |
| mutex_unlock(&data->mutex); |
| return -EAGAIN; |
| } |
| |
| n_meas = (val & soc_data->temp_value_mask) >> soc_data->temp_value_shift; |
| /* See imx_get_sensor_data() for formula derivation */ |
| *temp = data->c2 - n_meas * data->c1; |
| if (data->socdata->version == TEMPMON_IMX7) |
| *temp = (n_meas - data->c1 + 25) * 1000; |
| else |
| *temp = data->c2 - n_meas * data->c1; |
| |
| /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */ |
| if (data->socdata->version == TEMPMON_IMX6Q) { |
| if (data->alarm_temp == data->temp_passive && |
| *temp >= data->temp_passive) |
| imx_set_alarm_temp(data, data->temp_critical); |
| if (data->alarm_temp == data->temp_critical && |
| *temp < data->temp_passive) { |
| imx_set_alarm_temp(data, data->temp_passive); |
| dev_dbg(&tz->device, "thermal alarm off: T < %lu\n", |
| data->alarm_temp / 1000); |
| } |
| } |
| |
| if (*temp != data->last_temp) { |
| dev_dbg(&tz->device, "millicelsius: %ld\n", *temp); |
| data->last_temp = *temp; |
| } |
| |
| /* Reenable alarm IRQ if temperature below alarm temperature */ |
| if (!data->irq_enabled && *temp < data->alarm_temp) { |
| data->irq_enabled = true; |
| enable_irq(data->irq); |
| } |
| mutex_unlock(&data->mutex); |
| |
| return 0; |
| } |
| |
| static int imx_get_mode(struct thermal_zone_device *tz, |
| enum thermal_device_mode *mode) |
| { |
| struct imx_thermal_data *data = tz->devdata; |
| |
| *mode = data->mode; |
| |
| return 0; |
| } |
| |
| static int imx_set_mode(struct thermal_zone_device *tz, |
| enum thermal_device_mode mode) |
| { |
| struct imx_thermal_data *data = tz->devdata; |
| const struct thermal_soc_data *soc_data = data->socdata; |
| struct regmap *map = data->tempmon; |
| |
| if (mode == THERMAL_DEVICE_ENABLED) { |
| tz->polling_delay = IMX_POLLING_DELAY; |
| tz->passive_delay = IMX_PASSIVE_DELAY; |
| |
| regmap_write(map, soc_data->sensor_ctrl + REG_CLR, |
| soc_data->power_down_mask); |
| regmap_write(map, soc_data->sensor_ctrl + REG_SET, |
| soc_data->measure_temp_mask); |
| if (!data->irq_enabled) { |
| data->irq_enabled = true; |
| enable_irq(data->irq); |
| } |
| } else { |
| regmap_write(map, soc_data->sensor_ctrl + REG_CLR, |
| soc_data->measure_temp_mask); |
| regmap_write(map, soc_data->sensor_ctrl + REG_SET, |
| soc_data->power_down_mask); |
| |
| tz->polling_delay = 0; |
| tz->passive_delay = 0; |
| |
| if (data->irq_enabled) { |
| disable_irq(data->irq); |
| data->irq_enabled = false; |
| } |
| } |
| |
| data->mode = mode; |
| thermal_zone_device_update(tz); |
| |
| return 0; |
| } |
| |
| static int imx_get_trip_type(struct thermal_zone_device *tz, int trip, |
| enum thermal_trip_type *type) |
| { |
| *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE : |
| THERMAL_TRIP_CRITICAL; |
| return 0; |
| } |
| |
| static int imx_get_crit_temp(struct thermal_zone_device *tz, |
| unsigned long *temp) |
| { |
| struct imx_thermal_data *data = tz->devdata; |
| |
| *temp = data->temp_critical; |
| return 0; |
| } |
| |
| static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip, |
| unsigned long *temp) |
| { |
| struct imx_thermal_data *data = tz->devdata; |
| |
| *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive : |
| data->temp_critical; |
| return 0; |
| } |
| |
| static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip, |
| unsigned long temp) |
| { |
| struct imx_thermal_data *data = tz->devdata; |
| |
| if (trip == IMX_TRIP_CRITICAL) { |
| data->temp_critical = temp; |
| if (data->socdata->version == TEMPMON_IMX6SX) |
| imx_set_panic_temp(data, temp); |
| } |
| |
| if (trip == IMX_TRIP_PASSIVE) { |
| if (temp > IMX_TEMP_PASSIVE) |
| return -EINVAL; |
| data->temp_passive = temp; |
| imx_set_alarm_temp(data, temp); |
| } |
| |
| return 0; |
| } |
| |
| static int imx_bind(struct thermal_zone_device *tz, |
| struct thermal_cooling_device *cdev) |
| { |
| int ret; |
| |
| ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, |
| THERMAL_NO_LIMIT, |
| THERMAL_NO_LIMIT); |
| if (ret) { |
| dev_err(&tz->device, |
| "binding zone %s with cdev %s failed:%d\n", |
| tz->type, cdev->type, ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int imx_unbind(struct thermal_zone_device *tz, |
| struct thermal_cooling_device *cdev) |
| { |
| int ret; |
| |
| ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); |
| if (ret) { |
| dev_err(&tz->device, |
| "unbinding zone %s with cdev %s failed:%d\n", |
| tz->type, cdev->type, ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int imx_get_trend(struct thermal_zone_device *tz, |
| int trip, enum thermal_trend *trend) |
| { |
| int ret; |
| unsigned long trip_temp; |
| |
| ret = imx_get_trip_temp(tz, trip, &trip_temp); |
| if (ret < 0) |
| return ret; |
| |
| if (tz->temperature >= (trip_temp - IMX_TEMP_PASSIVE_COOL_DELTA)) |
| *trend = THERMAL_TREND_RAISE_FULL; |
| else |
| *trend = THERMAL_TREND_DROP_FULL; |
| |
| return 0; |
| } |
| static struct thermal_zone_device_ops imx_tz_ops = { |
| .bind = imx_bind, |
| .unbind = imx_unbind, |
| .get_temp = imx_get_temp, |
| .get_mode = imx_get_mode, |
| .set_mode = imx_set_mode, |
| .get_trip_type = imx_get_trip_type, |
| .get_trip_temp = imx_get_trip_temp, |
| .get_crit_temp = imx_get_crit_temp, |
| .set_trip_temp = imx_set_trip_temp, |
| .get_trend = imx_get_trend, |
| }; |
| |
| static inline void imx6_calibrate_data(struct imx_thermal_data *data, u32 val) |
| { |
| int t1, t2, n1, n2; |
| u64 temp64; |
| /* |
| * Sensor data layout: |
| * [31:20] - sensor value @ 25C |
| * [19:8] - sensor value of hot |
| * [7:0] - hot temperature value |
| * Use universal formula now and only need sensor value @ 25C |
| * slope = 0.4297157 - (0.0015976 * 25C fuse) |
| */ |
| n1 = val >> 20; |
| n2 = (val & 0xfff00) >> 8; |
| t2 = val & 0xff; |
| t1 = 25; /* t1 always 25C */ |
| |
| /* |
| * Derived from linear interpolation: |
| * slope = 0.4297157 - (0.0015976 * 25C fuse) |
| * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0 |
| * offset = OFFSET / 1000000 |
| * (Nmeas - n1) / (Tmeas - t1) = slope |
| * We want to reduce this down to the minimum computation necessary |
| * for each temperature read. Also, we want Tmeas in millicelsius |
| * and we don't want to lose precision from integer division. So... |
| * Tmeas = (Nmeas - n1) / slope + t1 + offset |
| * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1 + OFFSET / 1000 |
| * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1 + OFFSET /1000 |
| * Let constant c1 = (-1000 / slope) |
| * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1 + OFFSET / 1000 |
| * Let constant c2 = n1 *c1 + 1000 * t1 + OFFSET / 1000 |
| * milli_Tmeas = c2 - Nmeas * c1 |
| */ |
| temp64 = FACTOR0; |
| temp64 *= 1000; |
| do_div(temp64, FACTOR1 * n1 - FACTOR2); |
| data->c1 = temp64; |
| temp64 = OFFSET; |
| do_div(temp64, 1000); |
| data->c2 = n1 * data->c1 + 1000 * t1 + temp64; |
| } |
| |
| /* |
| * On i.MX7, we only use the calibration data at 25C to get the temp, |
| * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C. |
| */ |
| static inline void imx7_calibrate_data(struct imx_thermal_data *data, u32 val) |
| { |
| data->c1 = (val >> 9) & 0x1ff; |
| } |
| |
| static int imx_get_sensor_data(struct platform_device *pdev) |
| { |
| struct imx_thermal_data *data = platform_get_drvdata(pdev); |
| struct regmap *map; |
| int ret; |
| u32 val; |
| |
| map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, |
| "fsl,tempmon-data"); |
| if (IS_ERR(map)) { |
| ret = PTR_ERR(map); |
| dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); |
| return ret; |
| } |
| |
| if (data->socdata->version == TEMPMON_IMX7) |
| ret = regmap_read(map, IMX7_OCOTP_ANA1, &val); |
| else |
| ret = regmap_read(map, IMX6_OCOTP_ANA1, &val); |
| |
| if (ret) { |
| dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); |
| return ret; |
| } |
| |
| if (val == 0 || val == ~0) { |
| dev_err(&pdev->dev, "invalid sensor calibration data\n"); |
| return -EINVAL; |
| } |
| |
| if (data->socdata->version == TEMPMON_IMX7) |
| imx7_calibrate_data(data, val); |
| else |
| imx6_calibrate_data(data, val); |
| |
| /* |
| * Set the default passive cooling trip point to IMX_TEMP_PASSIVE. |
| * Can be changed from userspace. |
| */ |
| data->temp_passive = IMX_TEMP_PASSIVE; |
| |
| /* |
| * Set the default critical trip point to 20 C higher |
| * than passive trip point. Can be changed from userspace. |
| */ |
| data->temp_critical = IMX_TEMP_PASSIVE + 20 * 1000; |
| |
| return 0; |
| } |
| |
| static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) |
| { |
| struct imx_thermal_data *data = dev; |
| |
| disable_irq_nosync(irq); |
| data->irq_enabled = false; |
| |
| return IRQ_WAKE_THREAD; |
| } |
| |
| static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) |
| { |
| struct imx_thermal_data *data = dev; |
| |
| dev_dbg(&data->tz->device, "THERMAL ALARM: T > %lu\n", |
| data->alarm_temp / 1000); |
| |
| thermal_zone_device_update(data->tz); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static const struct of_device_id of_imx_thermal_match[] = { |
| { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, }, |
| { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, }, |
| { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, }, |
| { /* end */ } |
| }; |
| MODULE_DEVICE_TABLE(of, of_imx_thermal_match); |
| |
| static int thermal_notifier_event(struct notifier_block *this, |
| unsigned long event, void *ptr) |
| { |
| const struct thermal_soc_data *soc_data = imx_thermal_data->socdata; |
| struct regmap *map = imx_thermal_data->tempmon; |
| |
| mutex_lock(&imx_thermal_data->mutex); |
| |
| switch (event) { |
| /* |
| * In low_bus_freq_mode, the thermal sensor auto measurement |
| * can be disabled to low the power consumption. |
| */ |
| case LOW_BUSFREQ_ENTER: |
| regmap_write(map, soc_data->sensor_ctrl + REG_CLR, |
| soc_data->measure_temp_mask); |
| regmap_write(map, soc_data->sensor_ctrl + REG_SET, |
| soc_data->power_down_mask); |
| imx_thermal_data->mode = THERMAL_DEVICE_DISABLED; |
| disable_irq(imx_thermal_data->irq); |
| clk_disable_unprepare(imx_thermal_data->thermal_clk); |
| break; |
| |
| /* Enabled thermal auto measurement when exiting low_bus_freq_mode */ |
| case LOW_BUSFREQ_EXIT: |
| clk_prepare_enable(imx_thermal_data->thermal_clk); |
| regmap_write(map, soc_data->sensor_ctrl + REG_CLR, |
| soc_data->power_down_mask); |
| regmap_write(map, soc_data->sensor_ctrl + REG_SET, |
| soc_data->measure_temp_mask); |
| imx_thermal_data->mode = THERMAL_DEVICE_ENABLED; |
| enable_irq(imx_thermal_data->irq); |
| break; |
| |
| default: |
| break; |
| } |
| mutex_unlock(&imx_thermal_data->mutex); |
| |
| return NOTIFY_OK; |
| } |
| |
| static struct notifier_block thermal_notifier = { |
| .notifier_call = thermal_notifier_event, |
| }; |
| |
| static int imx_thermal_probe(struct platform_device *pdev) |
| { |
| const struct of_device_id *of_id = |
| of_match_device(of_imx_thermal_match, &pdev->dev); |
| struct imx_thermal_data *data; |
| struct regmap *map; |
| int measure_freq; |
| int ret, revision; |
| |
| data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| imx_thermal_data = data; |
| |
| map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); |
| if (IS_ERR(map)) { |
| ret = PTR_ERR(map); |
| dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); |
| return ret; |
| } |
| data->tempmon = map; |
| |
| data->socdata = of_id->data; |
| |
| /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ |
| if (data->socdata->version == TEMPMON_IMX6SX) { |
| regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH | |
| MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC); |
| /* |
| * reset value of LOW ALARM is incorrect, set it to lowest |
| * value to avoid false trigger of low alarm. |
| */ |
| regmap_write(map, TEMPSENSE2 + REG_SET, |
| TEMPSENSE2_LOW_VALUE_MASK); |
| } |
| |
| data->irq = platform_get_irq(pdev, 0); |
| if (data->irq < 0) |
| return data->irq; |
| |
| platform_set_drvdata(pdev, data); |
| |
| ret = imx_get_sensor_data(pdev); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to get sensor data\n"); |
| return ret; |
| } |
| |
| /* |
| * for i.MX7D TO1.0, finish bit is not available, check the |
| * SOC revision to skip checking the finish bit status. |
| */ |
| regmap_read(map, IMX7_ANADIG_DIGPROG, &revision); |
| if ((revision & 0xff) == 0x10) |
| skip_finish_check = 1; |
| |
| /* Make sure sensor is in known good state for measurements */ |
| regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, |
| data->socdata->power_down_mask); |
| regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, |
| data->socdata->measure_temp_mask); |
| regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR, |
| data->socdata->measure_freq_mask); |
| if (data->socdata->version != TEMPMON_IMX7) |
| regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF); |
| regmap_write(map, data->socdata->sensor_ctrl + REG_SET, |
| data->socdata->power_down_mask); |
| |
| data->cdev[0] = cpufreq_cooling_register(cpu_present_mask); |
| if (IS_ERR(data->cdev[0])) { |
| ret = PTR_ERR(data->cdev[0]); |
| if (ret != -EPROBE_DEFER) |
| dev_err(&pdev->dev, |
| "failed to register cpufreq cooling device: %d\n", |
| ret); |
| return ret; |
| } |
| |
| data->cdev[1] = devfreq_cooling_register(); |
| if (IS_ERR(data->cdev[1])) { |
| ret = PTR_ERR(data->cdev[1]); |
| if (ret != -EPROBE_DEFER) { |
| dev_err(&pdev->dev, |
| "failed to register cpufreq cooling device: %d\n", |
| ret); |
| cpufreq_cooling_unregister(data->cdev[0]); |
| } |
| return ret; |
| } |
| |
| data->thermal_clk = devm_clk_get(&pdev->dev, NULL); |
| if (IS_ERR(data->thermal_clk)) { |
| ret = PTR_ERR(data->thermal_clk); |
| if (ret != -EPROBE_DEFER) |
| dev_err(&pdev->dev, |
| "failed to get thermal clk: %d\n", ret); |
| cpufreq_cooling_unregister(data->cdev[0]); |
| return ret; |
| } |
| |
| /* |
| * Thermal sensor needs clk on to get correct value, normally |
| * we should enable its clk before taking measurement and disable |
| * clk after measurement is done, but if alarm function is enabled, |
| * hardware will auto measure the temperature periodically, so we |
| * need to keep the clk always on for alarm function. |
| */ |
| ret = clk_prepare_enable(data->thermal_clk); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); |
| cpufreq_cooling_unregister(data->cdev[0]); |
| devfreq_cooling_unregister(data->cdev[1]); |
| return ret; |
| } |
| |
| mutex_init(&data->mutex); |
| data->tz = thermal_zone_device_register("imx_thermal_zone", |
| IMX_TRIP_NUM, |
| (1 << IMX_TRIP_NUM) - 1, data, |
| &imx_tz_ops, NULL, |
| IMX_PASSIVE_DELAY, |
| IMX_POLLING_DELAY); |
| if (IS_ERR(data->tz)) { |
| ret = PTR_ERR(data->tz); |
| dev_err(&pdev->dev, |
| "failed to register thermal zone device %d\n", ret); |
| clk_disable_unprepare(data->thermal_clk); |
| cpufreq_cooling_unregister(data->cdev[0]); |
| devfreq_cooling_unregister(data->cdev[1]); |
| return ret; |
| } |
| |
| /* Enable measurements at ~ 10 Hz */ |
| regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR, |
| data->socdata->measure_freq_mask); |
| measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ |
| regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET, |
| measure_freq << data->socdata->measure_freq_shift); |
| imx_set_alarm_temp(data, data->temp_passive); |
| |
| if (data->socdata->version == TEMPMON_IMX6SX) |
| imx_set_panic_temp(data, data->temp_critical); |
| |
| regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, |
| data->socdata->power_down_mask); |
| regmap_write(map, data->socdata->sensor_ctrl + REG_SET, |
| data->socdata->measure_temp_mask); |
| |
| ret = devm_request_threaded_irq(&pdev->dev, data->irq, |
| imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, |
| 0, "imx_thermal", data); |
| if (ret < 0) { |
| dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); |
| return ret; |
| } |
| |
| data->irq_enabled = true; |
| data->mode = THERMAL_DEVICE_ENABLED; |
| |
| /* register the busfreq notifier called in low bus freq */ |
| if (data->socdata->version != TEMPMON_IMX7) |
| register_busfreq_notifier(&thermal_notifier); |
| |
| return 0; |
| } |
| |
| static int imx_thermal_remove(struct platform_device *pdev) |
| { |
| struct imx_thermal_data *data = platform_get_drvdata(pdev); |
| struct regmap *map = data->tempmon; |
| |
| /* Disable measurements */ |
| regmap_write(map, data->socdata->sensor_ctrl + REG_SET, |
| data->socdata->power_down_mask); |
| if (!IS_ERR(data->thermal_clk)) |
| clk_disable_unprepare(data->thermal_clk); |
| |
| /* unregister the busfreq notifier called in low bus freq */ |
| if (data->socdata->version != TEMPMON_IMX7) |
| unregister_busfreq_notifier(&thermal_notifier); |
| |
| thermal_zone_device_unregister(data->tz); |
| cpufreq_cooling_unregister(data->cdev[0]); |
| devfreq_cooling_unregister(data->cdev[1]); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int imx_thermal_suspend(struct device *dev) |
| { |
| struct imx_thermal_data *data = dev_get_drvdata(dev); |
| struct regmap *map = data->tempmon; |
| |
| /* |
| * Need to disable thermal sensor, otherwise, when thermal core |
| * try to get temperature before thermal sensor resume, a wrong |
| * temperature will be read as the thermal sensor is powered |
| * down. |
| */ |
| regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, |
| data->socdata->measure_temp_mask); |
| regmap_write(map, data->socdata->sensor_ctrl + REG_SET, |
| data->socdata->power_down_mask); |
| data->mode = THERMAL_DEVICE_DISABLED; |
| clk_disable_unprepare(data->thermal_clk); |
| |
| return 0; |
| } |
| |
| static int imx_thermal_resume(struct device *dev) |
| { |
| struct imx_thermal_data *data = dev_get_drvdata(dev); |
| struct regmap *map = data->tempmon; |
| |
| clk_prepare_enable(data->thermal_clk); |
| /* Enabled thermal sensor after resume */ |
| regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, |
| data->socdata->power_down_mask); |
| regmap_write(map, data->socdata->sensor_ctrl + REG_SET, |
| data->socdata->measure_temp_mask); |
| data->mode = THERMAL_DEVICE_ENABLED; |
| |
| return 0; |
| } |
| #endif |
| |
| static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops, |
| imx_thermal_suspend, imx_thermal_resume); |
| |
| static struct platform_driver imx_thermal = { |
| .driver = { |
| .name = "imx_thermal", |
| .pm = &imx_thermal_pm_ops, |
| .of_match_table = of_imx_thermal_match, |
| }, |
| .probe = imx_thermal_probe, |
| .remove = imx_thermal_remove, |
| }; |
| module_platform_driver(imx_thermal); |
| |
| MODULE_AUTHOR("Freescale Semiconductor, Inc."); |
| MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("platform:imx-thermal"); |