// SPDX-License-Identifier: GPL-2.0
//
// Copyright 2013 Freescale Semiconductor, Inc.

#include <linux/clk.h>
#include <linux/cpufreq.h>
#include <linux/cpu_cooling.h>
#include <linux/delay.h>
#include <linux/device.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>
#include <linux/nvmem-consumer.h>

#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,
        IMX_TRIP_NUM,
};

#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_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 cpufreq_policy *policy;
        struct thermal_zone_device *tz;
        struct thermal_cooling_device *cdev;
        enum thermal_device_mode mode;
        struct regmap *tempmon;
        u32 c1, c2; /* See formula in imx_init_calib() */
        int temp_passive;
        int temp_critical;
        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 = tz->devdata;
        const struct thermal_soc_data *soc_data = data->socdata;
        struct regmap *map = data->tempmon;
        unsigned int n_meas;
        bool wait;
        u32 val;

        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.
                 */
                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)
                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);
        }

        if ((val & soc_data->temp_valid_mask) == 0) {
                dev_dbg(&tz->device, "temp measurement never finished\n");
                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 == 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 < %d\n",
                                data->alarm_temp / 1000);
                }
        }

        if (*temp != data->last_temp) {
                dev_dbg(&tz->device, "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);
        }

        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;
        struct regmap *map = data->tempmon;
        const struct thermal_soc_data *soc_data = data->socdata;

        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, THERMAL_EVENT_UNSPECIFIED);

        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, int *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,
                             int *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,
                             int temp)
{
        struct imx_thermal_data *data = tz->devdata;

        /* do not allow changing critical threshold */
        if (trip == IMX_TRIP_CRITICAL)
                return -EPERM;

        /* do not allow passive to be set higher than critical */
        if (temp < 0 || temp > data->temp_critical)
                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,
                                               THERMAL_WEIGHT_DEFAULT);
        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 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,
};

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)
         */
        data->temp_critical = data->temp_max - (1000 * 5);
        data->temp_passive = data->temp_max - (1000 * 10);
}

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;
        imx_init_calib(pdev, val);

        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->tz->device, "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);

static int imx_thermal_probe(struct platform_device *pdev)
{
        struct imx_thermal_data *data;
        struct regmap *map;
        int measure_freq;
        int ret;

        data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;

        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_device_get_match_data(&pdev->dev);
        if (!data->socdata) {
                dev_err(&pdev->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_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
                ret = imx_init_from_nvmem_cells(pdev);
                if (ret == -EPROBE_DEFER)
                        return ret;
                if (ret) {
                        dev_err(&pdev->dev, "failed to init from nvmem: %d\n",
                                ret);
                        return ret;
                }
        } else {
                ret = imx_init_from_tempmon_data(pdev);
                if (ret) {
                        dev_err(&pdev->dev, "failed to init from 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);

        data->policy = cpufreq_cpu_get(0);
        if (!data->policy) {
                pr_debug("%s: CPUFreq policy not found\n", __func__);
                return -EPROBE_DEFER;
        }

        data->cdev = cpufreq_cooling_register(data->policy);
        if (IS_ERR(data->cdev)) {
                ret = PTR_ERR(data->cdev);
                dev_err(&pdev->dev,
                        "failed to register cpufreq cooling device: %d\n", ret);
                cpufreq_cpu_put(data->policy);
                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);
                cpufreq_cpu_put(data->policy);
                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);
                cpufreq_cpu_put(data->policy);
                return ret;
        }

        data->tz = thermal_zone_device_register("imx_thermal_zone",
                                                IMX_TRIP_NUM,
                                                BIT(IMX_TRIP_PASSIVE), 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);
                cpufreq_cpu_put(data->policy);
                return ret;
        }

        dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
                 " critical:%dC passive:%dC\n", data->temp_grade,
                 data->temp_max / 1000, data->temp_critical / 1000,
                 data->temp_passive / 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, 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);

        data->irq_enabled = true;
        data->mode = THERMAL_DEVICE_ENABLED;

        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);
                clk_disable_unprepare(data->thermal_clk);
                thermal_zone_device_unregister(data->tz);
                cpufreq_cooling_unregister(data->cdev);
                cpufreq_cpu_put(data->policy);
                return ret;
        }

        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);

        thermal_zone_device_unregister(data->tz);
        cpufreq_cooling_unregister(data->cdev);
        cpufreq_cpu_put(data->policy);

        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;
        int ret;

        ret = clk_prepare_enable(data->thermal_clk);
        if (ret)
                return ret;
        /* 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");