// SPDX-License-Identifier: GPL-2.0 // // Copyright 2013 Freescale Semiconductor, Inc. #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define REG_SET 0x4 #define REG_CLR 0x8 #define REG_TOG 0xc /* i.MX6 specific */ #define IMX6_MISC0 0x0150 #define IMX6_MISC0_REFTOP_SELBIASOFF (1 << 3) #define IMX6_MISC1 0x0160 #define IMX6_MISC1_IRQ_TEMPHIGH (1 << 29) /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */ #define IMX6_MISC1_IRQ_TEMPLOW (1 << 28) #define IMX6_MISC1_IRQ_TEMPPANIC (1 << 27) #define IMX6_TEMPSENSE0 0x0180 #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 0x0190 #define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff #define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 0 #define OCOTP_MEM0 0x0480 #define OCOTP_ANA1 0x04e0 /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */ #define IMX6_TEMPSENSE2 0x0290 #define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT 0 #define IMX6_TEMPSENSE2_LOW_VALUE_MASK 0xfff #define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT 16 #define IMX6_TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000 /* i.MX7 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 /* The driver supports 1 passive trip point and 1 critical trip point */ enum imx_thermal_trip { IMX_TRIP_PASSIVE, IMX_TRIP_CRITICAL, }; #define IMX_POLLING_DELAY 2000 /* millisecond */ #define IMX_PASSIVE_DELAY 1000 #define TEMPMON_IMX6Q 1 #define TEMPMON_IMX6SX 2 #define TEMPMON_IMX7D 3 struct thermal_soc_data { u32 version; u32 sensor_ctrl; 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; }; static struct thermal_trip trips[] = { [IMX_TRIP_PASSIVE] = { .type = THERMAL_TRIP_PASSIVE, .flags = THERMAL_TRIP_FLAG_RW_TEMP }, [IMX_TRIP_CRITICAL] = { .type = THERMAL_TRIP_CRITICAL }, }; 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 = IMX6_TEMPSENSE2, .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK, .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT, .low_alarm_ctrl = IMX6_TEMPSENSE2, .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK, .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT, }; static struct thermal_soc_data thermal_imx7d_data = { .version = TEMPMON_IMX7D, .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 device *dev; struct cpufreq_policy *policy; struct thermal_zone_device *tz; struct thermal_cooling_device *cdev; struct regmap *tempmon; u32 c1, c2; /* See formula in imx_init_calib() */ int temp_max; int alarm_temp; int last_temp; bool irq_enabled; int irq; struct clk *thermal_clk; const struct thermal_soc_data *socdata; const char *temp_grade; }; static void imx_set_panic_temp(struct imx_thermal_data *data, int panic_temp) { const struct thermal_soc_data *soc_data = data->socdata; struct regmap *map = data->tempmon; int critical_value; 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, int alarm_temp) { struct regmap *map = data->tempmon; const struct thermal_soc_data *soc_data = data->socdata; int alarm_value; data->alarm_temp = alarm_temp; if (data->socdata->version == TEMPMON_IMX7D) 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, int *temp) { struct imx_thermal_data *data = thermal_zone_device_priv(tz); const struct thermal_soc_data *soc_data = data->socdata; struct regmap *map = data->tempmon; unsigned int n_meas; u32 val; int ret; ret = pm_runtime_resume_and_get(data->dev); if (ret < 0) return ret; regmap_read(map, soc_data->temp_data, &val); if ((val & soc_data->temp_valid_mask) == 0) return -EAGAIN; n_meas = (val & soc_data->temp_value_mask) >> soc_data->temp_value_shift; /* See imx_init_calib() for formula derivation */ if (data->socdata->version == TEMPMON_IMX7D) *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 == trips[IMX_TRIP_PASSIVE].temperature && *temp >= trips[IMX_TRIP_PASSIVE].temperature) imx_set_alarm_temp(data, trips[IMX_TRIP_CRITICAL].temperature); if (data->alarm_temp == trips[IMX_TRIP_CRITICAL].temperature && *temp < trips[IMX_TRIP_PASSIVE].temperature) { imx_set_alarm_temp(data, trips[IMX_TRIP_PASSIVE].temperature); dev_dbg(data->dev, "thermal alarm off: T < %d\n", data->alarm_temp / 1000); } } if (*temp != data->last_temp) { dev_dbg(data->dev, "millicelsius: %d\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); } pm_runtime_put(data->dev); return 0; } static int imx_change_mode(struct thermal_zone_device *tz, enum thermal_device_mode mode) { struct imx_thermal_data *data = thermal_zone_device_priv(tz); if (mode == THERMAL_DEVICE_ENABLED) { pm_runtime_get(data->dev); if (!data->irq_enabled) { data->irq_enabled = true; enable_irq(data->irq); } } else { pm_runtime_put(data->dev); if (data->irq_enabled) { disable_irq(data->irq); data->irq_enabled = false; } } return 0; } static int imx_set_trip_temp(struct thermal_zone_device *tz, const struct thermal_trip *trip, int temp) { struct imx_thermal_data *data = thermal_zone_device_priv(tz); int ret; ret = pm_runtime_resume_and_get(data->dev); if (ret < 0) return ret; /* do not allow passive to be set higher than critical */ if (temp < 0 || temp > trips[IMX_TRIP_CRITICAL].temperature) return -EINVAL; imx_set_alarm_temp(data, temp); trips[IMX_TRIP_PASSIVE].temperature = temp; pm_runtime_put(data->dev); return 0; } static bool imx_should_bind(struct thermal_zone_device *tz, const struct thermal_trip *trip, struct thermal_cooling_device *cdev, struct cooling_spec *c) { return trip->type == THERMAL_TRIP_PASSIVE; } static struct thermal_zone_device_ops imx_tz_ops = { .should_bind = imx_should_bind, .get_temp = imx_get_temp, .change_mode = imx_change_mode, .set_trip_temp = imx_set_trip_temp, }; static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1) { struct imx_thermal_data *data = platform_get_drvdata(pdev); int n1; u64 temp64; if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) { dev_err(&pdev->dev, "invalid sensor calibration data\n"); return -EINVAL; } /* * On i.MX7D, we only use the calibration data at 25C to get the temp, * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C. */ if (data->socdata->version == TEMPMON_IMX7D) { data->c1 = (ocotp_ana1 >> 9) & 0x1ff; return 0; } /* * The sensor is calibrated at 25 °C (aka T1) and the value measured * (aka N1) at this temperature is provided in bits [31:20] in the * i.MX's OCOTP value ANA1. * To find the actual temperature T, the following formula has to be used * when reading value n from the sensor: * * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C * = c2 - c1 * N * * with * * T1' = 28.580661 °C * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C * = T1' + N1 * c1 */ n1 = ocotp_ana1 >> 20; temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */ temp64 *= 1000; /* to get result in °mC */ do_div(temp64, 15423 * n1 - 4148468); data->c1 = temp64; data->c2 = n1 * data->c1 + 28581; return 0; } static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0) { struct imx_thermal_data *data = platform_get_drvdata(pdev); /* The maximum die temp is specified by the Temperature Grade */ switch ((ocotp_mem0 >> 6) & 0x3) { case 0: /* Commercial (0 to 95 °C) */ data->temp_grade = "Commercial"; data->temp_max = 95000; break; case 1: /* Extended Commercial (-20 °C to 105 °C) */ data->temp_grade = "Extended Commercial"; data->temp_max = 105000; break; case 2: /* Industrial (-40 °C to 105 °C) */ data->temp_grade = "Industrial"; data->temp_max = 105000; break; case 3: /* Automotive (-40 °C to 125 °C) */ data->temp_grade = "Automotive"; data->temp_max = 125000; break; } /* * Set the critical trip point at 5 °C under max * Set the passive trip point at 10 °C under max (changeable via sysfs) */ trips[IMX_TRIP_PASSIVE].temperature = data->temp_max - (1000 * 10); trips[IMX_TRIP_CRITICAL].temperature = data->temp_max - (1000 * 5); } static int imx_init_from_tempmon_data(struct platform_device *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; } ret = regmap_read(map, OCOTP_ANA1, &val); if (ret) { dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); return ret; } ret = imx_init_calib(pdev, val); if (ret) return ret; ret = regmap_read(map, OCOTP_MEM0, &val); if (ret) { dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); return ret; } imx_init_temp_grade(pdev, val); return 0; } static int imx_init_from_nvmem_cells(struct platform_device *pdev) { int ret; u32 val; ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val); if (ret) return ret; ret = imx_init_calib(pdev, val); if (ret) return ret; ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val); if (ret) return ret; imx_init_temp_grade(pdev, val); 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->dev, "THERMAL ALARM: T > %d\n", data->alarm_temp / 1000); thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); 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); #ifdef CONFIG_CPU_FREQ /* * Create cooling device in case no #cooling-cells property is available in * CPU node */ static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) { struct device_node *np; int ret = 0; data->policy = cpufreq_cpu_get(0); if (!data->policy) { pr_debug("%s: CPUFreq policy not found\n", __func__); return -EPROBE_DEFER; } np = of_get_cpu_node(data->policy->cpu, NULL); if (!np || !of_property_present(np, "#cooling-cells")) { data->cdev = cpufreq_cooling_register(data->policy); if (IS_ERR(data->cdev)) { ret = PTR_ERR(data->cdev); cpufreq_cpu_put(data->policy); } } of_node_put(np); return ret; } static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) { cpufreq_cooling_unregister(data->cdev); cpufreq_cpu_put(data->policy); } #else static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) { return 0; } static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) { } #endif static int imx_thermal_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct imx_thermal_data *data; struct regmap *map; int measure_freq; int ret; data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; data->dev = dev; map = syscon_regmap_lookup_by_phandle(dev->of_node, "fsl,tempmon"); if (IS_ERR(map)) { ret = PTR_ERR(map); dev_err(dev, "failed to get tempmon regmap: %d\n", ret); return ret; } data->tempmon = map; data->socdata = of_device_get_match_data(dev); if (!data->socdata) { dev_err(dev, "no device match found\n"); return -ENODEV; } /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ if (data->socdata->version == TEMPMON_IMX6SX) { regmap_write(map, IMX6_MISC1 + REG_CLR, IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW | IMX6_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, data->socdata->low_alarm_ctrl + REG_SET, data->socdata->low_alarm_mask); } data->irq = platform_get_irq(pdev, 0); if (data->irq < 0) return data->irq; platform_set_drvdata(pdev, data); if (of_property_present(dev->of_node, "nvmem-cells")) { ret = imx_init_from_nvmem_cells(pdev); if (ret) return dev_err_probe(dev, ret, "failed to init from nvmem\n"); } else { ret = imx_init_from_tempmon_data(pdev); if (ret) { dev_err(dev, "failed to init from fsl,tempmon-data\n"); return ret; } } /* 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_IMX7D) regmap_write(map, IMX6_MISC0 + REG_SET, IMX6_MISC0_REFTOP_SELBIASOFF); regmap_write(map, data->socdata->sensor_ctrl + REG_SET, data->socdata->power_down_mask); ret = imx_thermal_register_legacy_cooling(data); if (ret) return dev_err_probe(dev, ret, "failed to register cpufreq cooling device\n"); data->thermal_clk = devm_clk_get(dev, NULL); if (IS_ERR(data->thermal_clk)) { ret = dev_err_probe(dev, PTR_ERR(data->thermal_clk), "failed to get thermal clk\n"); goto legacy_cleanup; } /* * 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(dev, "failed to enable thermal clk: %d\n", ret); goto legacy_cleanup; } data->tz = thermal_zone_device_register_with_trips("imx_thermal_zone", trips, ARRAY_SIZE(trips), data, &imx_tz_ops, NULL, IMX_PASSIVE_DELAY, IMX_POLLING_DELAY); if (IS_ERR(data->tz)) { ret = PTR_ERR(data->tz); dev_err(dev, "failed to register thermal zone device %d\n", ret); goto clk_disable; } dev_info(dev, "%s CPU temperature grade - max:%dC" " critical:%dC passive:%dC\n", data->temp_grade, data->temp_max / 1000, trips[IMX_TRIP_CRITICAL].temperature / 1000, trips[IMX_TRIP_PASSIVE].temperature / 1000); /* 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, trips[IMX_TRIP_PASSIVE].temperature); if (data->socdata->version == TEMPMON_IMX6SX) imx_set_panic_temp(data, trips[IMX_TRIP_CRITICAL].temperature); 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); /* After power up, we need a delay before first access can be done. */ usleep_range(20, 50); /* the core was configured and enabled just before */ pm_runtime_set_active(dev); pm_runtime_enable(data->dev); ret = pm_runtime_resume_and_get(data->dev); if (ret < 0) goto disable_runtime_pm; data->irq_enabled = true; ret = thermal_zone_device_enable(data->tz); if (ret) goto thermal_zone_unregister; ret = devm_request_threaded_irq(dev, data->irq, imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, 0, "imx_thermal", data); if (ret < 0) { dev_err(dev, "failed to request alarm irq: %d\n", ret); goto thermal_zone_unregister; } pm_runtime_put(data->dev); return 0; thermal_zone_unregister: thermal_zone_device_unregister(data->tz); disable_runtime_pm: pm_runtime_put_noidle(data->dev); pm_runtime_disable(data->dev); clk_disable: clk_disable_unprepare(data->thermal_clk); legacy_cleanup: imx_thermal_unregister_legacy_cooling(data); return ret; } static void imx_thermal_remove(struct platform_device *pdev) { struct imx_thermal_data *data = platform_get_drvdata(pdev); pm_runtime_put_noidle(data->dev); pm_runtime_disable(data->dev); thermal_zone_device_unregister(data->tz); imx_thermal_unregister_legacy_cooling(data); } static int imx_thermal_suspend(struct device *dev) { struct imx_thermal_data *data = dev_get_drvdata(dev); int ret; /* * 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. This is done in change_mode() operation called from * thermal_zone_device_disable() */ ret = thermal_zone_device_disable(data->tz); if (ret) return ret; return pm_runtime_force_suspend(data->dev); } static int imx_thermal_resume(struct device *dev) { struct imx_thermal_data *data = dev_get_drvdata(dev); int ret; ret = pm_runtime_force_resume(data->dev); if (ret) return ret; /* Enabled thermal sensor after resume */ return thermal_zone_device_enable(data->tz); } static int imx_thermal_runtime_suspend(struct device *dev) { struct imx_thermal_data *data = dev_get_drvdata(dev); const struct thermal_soc_data *socdata = data->socdata; struct regmap *map = data->tempmon; int ret; ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR, socdata->measure_temp_mask); if (ret) return ret; ret = regmap_write(map, socdata->sensor_ctrl + REG_SET, socdata->power_down_mask); if (ret) return ret; clk_disable_unprepare(data->thermal_clk); return 0; } static int imx_thermal_runtime_resume(struct device *dev) { struct imx_thermal_data *data = dev_get_drvdata(dev); const struct thermal_soc_data *socdata = data->socdata; struct regmap *map = data->tempmon; int ret; ret = clk_prepare_enable(data->thermal_clk); if (ret) return ret; ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR, socdata->power_down_mask); if (ret) return ret; ret = regmap_write(map, socdata->sensor_ctrl + REG_SET, socdata->measure_temp_mask); if (ret) return ret; /* * According to the temp sensor designers, it may require up to ~17us * to complete a measurement. */ usleep_range(20, 50); return 0; } static const struct dev_pm_ops imx_thermal_pm_ops = { SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume) RUNTIME_PM_OPS(imx_thermal_runtime_suspend, imx_thermal_runtime_resume, NULL) }; static struct platform_driver imx_thermal = { .driver = { .name = "imx_thermal", .pm = pm_ptr(&imx_thermal_pm_ops), .of_match_table = of_imx_thermal_match, }, .probe = imx_thermal_probe, .remove_new = 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");