exynos_thermal.c

Go to the documentation of this file.

/*
 * exynos_thermal.c - Samsung EXYNOS TMU (Thermal Management Unit)
 *
 *  Copyright (C) 2011 Samsung Electronics
 *  Donggeun Kim <[email protected]>
 *  Amit Daniel Kachhap <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * 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 <linux/module.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/workqueue.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/platform_data/exynos_thermal.h>
#include <linux/thermal.h>
#include <linux/cpufreq.h>
#include <linux/cpu_cooling.h>
#include <linux/of.h>

#include <plat/cpu.h>

/* Exynos generic registers */
#define EXYNOS_TMU_REG_TRIMINFO     0x0
#define EXYNOS_TMU_REG_CONTROL      0x20
#define EXYNOS_TMU_REG_STATUS       0x28
#define EXYNOS_TMU_REG_CURRENT_TEMP 0x40
#define EXYNOS_TMU_REG_INTEN        0x70
#define EXYNOS_TMU_REG_INTSTAT      0x74
#define EXYNOS_TMU_REG_INTCLEAR     0x78

#define EXYNOS_TMU_TRIM_TEMP_MASK   0xff
#define EXYNOS_TMU_GAIN_SHIFT       8
#define EXYNOS_TMU_REF_VOLTAGE_SHIFT    24
#define EXYNOS_TMU_CORE_ON      3
#define EXYNOS_TMU_CORE_OFF     2
#define EXYNOS_TMU_DEF_CODE_TO_TEMP_OFFSET  50

/* Exynos4210 specific registers */
#define EXYNOS4210_TMU_REG_THRESHOLD_TEMP   0x44
#define EXYNOS4210_TMU_REG_TRIG_LEVEL0  0x50
#define EXYNOS4210_TMU_REG_TRIG_LEVEL1  0x54
#define EXYNOS4210_TMU_REG_TRIG_LEVEL2  0x58
#define EXYNOS4210_TMU_REG_TRIG_LEVEL3  0x5C
#define EXYNOS4210_TMU_REG_PAST_TEMP0   0x60
#define EXYNOS4210_TMU_REG_PAST_TEMP1   0x64
#define EXYNOS4210_TMU_REG_PAST_TEMP2   0x68
#define EXYNOS4210_TMU_REG_PAST_TEMP3   0x6C

#define EXYNOS4210_TMU_TRIG_LEVEL0_MASK 0x1
#define EXYNOS4210_TMU_TRIG_LEVEL1_MASK 0x10
#define EXYNOS4210_TMU_TRIG_LEVEL2_MASK 0x100
#define EXYNOS4210_TMU_TRIG_LEVEL3_MASK 0x1000
#define EXYNOS4210_TMU_INTCLEAR_VAL 0x1111

/* Exynos5250 and Exynos4412 specific registers */
#define EXYNOS_TMU_TRIMINFO_CON 0x14
#define EXYNOS_THD_TEMP_RISE        0x50
#define EXYNOS_THD_TEMP_FALL        0x54
#define EXYNOS_EMUL_CON     0x80

#define EXYNOS_TRIMINFO_RELOAD      0x1
#define EXYNOS_TMU_CLEAR_RISE_INT   0x111
#define EXYNOS_TMU_CLEAR_FALL_INT   (0x111 << 16)
#define EXYNOS_MUX_ADDR_VALUE       6
#define EXYNOS_MUX_ADDR_SHIFT       20
#define EXYNOS_TMU_TRIP_MODE_SHIFT  13

#define EFUSE_MIN_VALUE 40
#define EFUSE_MAX_VALUE 100

/* In-kernel thermal framework related macros & definations */
#define SENSOR_NAME_LEN 16
#define MAX_TRIP_COUNT  8
#define MAX_COOLING_DEVICE 4

#define ACTIVE_INTERVAL 500
#define IDLE_INTERVAL 10000
#define MCELSIUS    1000

/* CPU Zone information */
#define PANIC_ZONE      4
#define WARN_ZONE       3
#define MONITOR_ZONE    2
#define SAFE_ZONE       1

#define GET_ZONE(trip) (trip + 2)
#define GET_TRIP(zone) (zone - 2)

#define EXYNOS_ZONE_COUNT   3

struct exynos_tmu_data {
    struct exynos_tmu_platform_data *pdata;
    struct resource *mem;
    void __iomem *base;
    int irq;
    enum soc_type soc;
    struct work_struct irq_work;
    struct mutex lock;
    struct clk *clk;
    u8 temp_error1, temp_error2;
};

struct  thermal_trip_point_conf {
    int trip_val[MAX_TRIP_COUNT];
    int trip_count;
};

struct  thermal_cooling_conf {
    struct freq_clip_table freq_data[MAX_TRIP_COUNT];
    int freq_clip_count;
};

struct thermal_sensor_conf {
    char name[SENSOR_NAME_LEN];
    int (*read_temperature)(void *data);
    struct thermal_trip_point_conf trip_data;
    struct thermal_cooling_conf cooling_data;
    void *private_data;
};

struct exynos_thermal_zone {
    enum thermal_device_mode mode;
    struct thermal_zone_device *therm_dev;
    struct thermal_cooling_device *cool_dev[MAX_COOLING_DEVICE];
    unsigned int cool_dev_size;
    struct platform_device *exynos4_dev;
    struct thermal_sensor_conf *sensor_conf;
    bool bind;
};

static struct exynos_thermal_zone *th_zone;
static void exynos_unregister_thermal(void);
static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf);

/* Get mode callback functions for thermal zone */
static int exynos_get_mode(struct thermal_zone_device *thermal,
            enum thermal_device_mode *mode)
{
    if (th_zone)
        *mode = th_zone->mode;
    return 0;
}

/* Set mode callback functions for thermal zone */
static int exynos_set_mode(struct thermal_zone_device *thermal,
            enum thermal_device_mode mode)
{
    if (!th_zone->therm_dev) {
        pr_notice("thermal zone not registered\n");
        return 0;
    }

    mutex_lock(&th_zone->therm_dev->lock);

    if (mode == THERMAL_DEVICE_ENABLED)
        th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
    else
        th_zone->therm_dev->polling_delay = 0;

    mutex_unlock(&th_zone->therm_dev->lock);

    th_zone->mode = mode;
    thermal_zone_device_update(th_zone->therm_dev);
    pr_info("thermal polling set for duration=%d msec\n",
                th_zone->therm_dev->polling_delay);
    return 0;
}


/* Get trip type callback functions for thermal zone */
static int exynos_get_trip_type(struct thermal_zone_device *thermal, int trip,
                 enum thermal_trip_type *type)
{
    switch (GET_ZONE(trip)) {
    case MONITOR_ZONE:
    case WARN_ZONE:
        *type = THERMAL_TRIP_ACTIVE;
        break;
    case PANIC_ZONE:
        *type = THERMAL_TRIP_CRITICAL;
        break;
    default:
        return -EINVAL;
    }
    return 0;
}

/* Get trip temperature callback functions for thermal zone */
static int exynos_get_trip_temp(struct thermal_zone_device *thermal, int trip,
                unsigned long *temp)
{
    if (trip < GET_TRIP(MONITOR_ZONE) || trip > GET_TRIP(PANIC_ZONE))
        return -EINVAL;

    *temp = th_zone->sensor_conf->trip_data.trip_val[trip];
    /* convert the temperature into millicelsius */
    *temp = *temp * MCELSIUS;

    return 0;
}

/* Get critical temperature callback functions for thermal zone */
static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
                unsigned long *temp)
{
    int ret;
    /* Panic zone */
    ret = exynos_get_trip_temp(thermal, GET_TRIP(PANIC_ZONE), temp);
    return ret;
}

static int exynos_get_frequency_level(unsigned int cpu, unsigned int freq)
{
    int i = 0, ret = -EINVAL;
    struct cpufreq_frequency_table *table = NULL;
#ifdef CONFIG_CPU_FREQ
    table = cpufreq_frequency_get_table(cpu);
#endif
    if (!table)
        return ret;

    while (table[i].frequency != CPUFREQ_TABLE_END) {
        if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
            continue;
        if (table[i].frequency == freq)
            return i;
        i++;
    }
    return ret;
}

/* Bind callback functions for thermal zone */
static int exynos_bind(struct thermal_zone_device *thermal,
            struct thermal_cooling_device *cdev)
{
    int ret = 0, i, tab_size, level;
    struct freq_clip_table *tab_ptr, *clip_data;
    struct thermal_sensor_conf *data = th_zone->sensor_conf;

    tab_ptr = (struct freq_clip_table *)data->cooling_data.freq_data;
    tab_size = data->cooling_data.freq_clip_count;

    if (tab_ptr == NULL || tab_size == 0)
        return -EINVAL;

    /* find the cooling device registered*/
    for (i = 0; i < th_zone->cool_dev_size; i++)
        if (cdev == th_zone->cool_dev[i])
            break;

    /* No matching cooling device */
    if (i == th_zone->cool_dev_size)
        return 0;

    /* Bind the thermal zone to the cpufreq cooling device */
    for (i = 0; i < tab_size; i++) {
        clip_data = (struct freq_clip_table *)&(tab_ptr[i]);
        level = exynos_get_frequency_level(0, clip_data->freq_clip_max);
        if (level < 0)
            return 0;
        switch (GET_ZONE(i)) {
        case MONITOR_ZONE:
        case WARN_ZONE:
            if (thermal_zone_bind_cooling_device(thermal, i, cdev,
                                level, level)) {
                pr_err("error binding cdev inst %d\n", i);
                ret = -EINVAL;
            }
            th_zone->bind = true;
            break;
        default:
            ret = -EINVAL;
        }
    }

    return ret;
}

/* Unbind callback functions for thermal zone */
static int exynos_unbind(struct thermal_zone_device *thermal,
            struct thermal_cooling_device *cdev)
{
    int ret = 0, i, tab_size;
    struct thermal_sensor_conf *data = th_zone->sensor_conf;

    if (th_zone->bind == false)
        return 0;

    tab_size = data->cooling_data.freq_clip_count;

    if (tab_size == 0)
        return -EINVAL;

    /* find the cooling device registered*/
    for (i = 0; i < th_zone->cool_dev_size; i++)
        if (cdev == th_zone->cool_dev[i])
            break;

    /* No matching cooling device */
    if (i == th_zone->cool_dev_size)
        return 0;

    /* Bind the thermal zone to the cpufreq cooling device */
    for (i = 0; i < tab_size; i++) {
        switch (GET_ZONE(i)) {
        case MONITOR_ZONE:
        case WARN_ZONE:
            if (thermal_zone_unbind_cooling_device(thermal, i,
                                cdev)) {
                pr_err("error unbinding cdev inst=%d\n", i);
                ret = -EINVAL;
            }
            th_zone->bind = false;
            break;
        default:
            ret = -EINVAL;
        }
    }
    return ret;
}

/* Get temperature callback functions for thermal zone */
static int exynos_get_temp(struct thermal_zone_device *thermal,
            unsigned long *temp)
{
    void *data;

    if (!th_zone->sensor_conf) {
        pr_info("Temperature sensor not initialised\n");
        return -EINVAL;
    }
    data = th_zone->sensor_conf->private_data;
    *temp = th_zone->sensor_conf->read_temperature(data);
    /* convert the temperature into millicelsius */
    *temp = *temp * MCELSIUS;
    return 0;
}

/* Get the temperature trend */
static int exynos_get_trend(struct thermal_zone_device *thermal,
            int trip, enum thermal_trend *trend)
{
    if (thermal->temperature >= trip)
        *trend = THERMAL_TREND_RAISING;
    else
        *trend = THERMAL_TREND_DROPPING;

    return 0;
}
/* Operation callback functions for thermal zone */
static struct thermal_zone_device_ops const exynos_dev_ops = {
    .bind = exynos_bind,
    .unbind = exynos_unbind,
    .get_temp = exynos_get_temp,
    .get_trend = exynos_get_trend,
    .get_mode = exynos_get_mode,
    .set_mode = exynos_set_mode,
    .get_trip_type = exynos_get_trip_type,
    .get_trip_temp = exynos_get_trip_temp,
    .get_crit_temp = exynos_get_crit_temp,
};

/*
 * This function may be called from interrupt based temperature sensor
 * when threshold is changed.
 */
static void exynos_report_trigger(void)
{
    unsigned int i;
    char data[10];
    char *envp[] = { data, NULL };

    if (!th_zone || !th_zone->therm_dev)
        return;
    if (th_zone->bind == false) {
        for (i = 0; i < th_zone->cool_dev_size; i++) {
            if (!th_zone->cool_dev[i])
                continue;
            exynos_bind(th_zone->therm_dev,
                    th_zone->cool_dev[i]);
        }
    }

    thermal_zone_device_update(th_zone->therm_dev);

    mutex_lock(&th_zone->therm_dev->lock);
    /* Find the level for which trip happened */
    for (i = 0; i < th_zone->sensor_conf->trip_data.trip_count; i++) {
        if (th_zone->therm_dev->last_temperature <
            th_zone->sensor_conf->trip_data.trip_val[i] * MCELSIUS)
            break;
    }

    if (th_zone->mode == THERMAL_DEVICE_ENABLED) {
        if (i > 0)
            th_zone->therm_dev->polling_delay = ACTIVE_INTERVAL;
        else
            th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
    }

    snprintf(data, sizeof(data), "%u", i);
    kobject_uevent_env(&th_zone->therm_dev->device.kobj, KOBJ_CHANGE, envp);
    mutex_unlock(&th_zone->therm_dev->lock);
}

/* Register with the in-kernel thermal management */
static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
{
    int ret;
    struct cpumask mask_val;

    if (!sensor_conf || !sensor_conf->read_temperature) {
        pr_err("Temperature sensor not initialised\n");
        return -EINVAL;
    }

    th_zone = kzalloc(sizeof(struct exynos_thermal_zone), GFP_KERNEL);
    if (!th_zone)
        return -ENOMEM;

    th_zone->sensor_conf = sensor_conf;
    cpumask_set_cpu(0, &mask_val);
    th_zone->cool_dev[0] = cpufreq_cooling_register(&mask_val);
    if (IS_ERR(th_zone->cool_dev[0])) {
        pr_err("Failed to register cpufreq cooling device\n");
        ret = -EINVAL;
        goto err_unregister;
    }
    th_zone->cool_dev_size++;

    th_zone->therm_dev = thermal_zone_device_register(sensor_conf->name,
            EXYNOS_ZONE_COUNT, 0, NULL, &exynos_dev_ops, 0,
            IDLE_INTERVAL);

    if (IS_ERR(th_zone->therm_dev)) {
        pr_err("Failed to register thermal zone device\n");
        ret = -EINVAL;
        goto err_unregister;
    }
    th_zone->mode = THERMAL_DEVICE_ENABLED;

    pr_info("Exynos: Kernel Thermal management registered\n");

    return 0;

err_unregister:
    exynos_unregister_thermal();
    return ret;
}

/* Un-Register with the in-kernel thermal management */
static void exynos_unregister_thermal(void)
{
    int i;

    if (!th_zone)
        return;

    if (th_zone->therm_dev)
        thermal_zone_device_unregister(th_zone->therm_dev);

    for (i = 0; i < th_zone->cool_dev_size; i++) {
        if (th_zone->cool_dev[i])
            cpufreq_cooling_unregister(th_zone->cool_dev[i]);
    }

    kfree(th_zone);
    pr_info("Exynos: Kernel Thermal management unregistered\n");
}

/*
 * TMU treats temperature as a mapped temperature code.
 * The temperature is converted differently depending on the calibration type.
 */
static int temp_to_code(struct exynos_tmu_data *data, u8 temp)
{
    struct exynos_tmu_platform_data *pdata = data->pdata;
    int temp_code;

    if (data->soc == SOC_ARCH_EXYNOS4210)
        /* temp should range between 25 and 125 */
        if (temp < 25 || temp > 125) {
            temp_code = -EINVAL;
            goto out;
        }

    switch (pdata->cal_type) {
    case TYPE_TWO_POINT_TRIMMING:
        temp_code = (temp - 25) *
            (data->temp_error2 - data->temp_error1) /
            (85 - 25) + data->temp_error1;
        break;
    case TYPE_ONE_POINT_TRIMMING:
        temp_code = temp + data->temp_error1 - 25;
        break;
    default:
        temp_code = temp + EXYNOS_TMU_DEF_CODE_TO_TEMP_OFFSET;
        break;
    }
out:
    return temp_code;
}

/*
 * Calculate a temperature value from a temperature code.
 * The unit of the temperature is degree Celsius.
 */
static int code_to_temp(struct exynos_tmu_data *data, u8 temp_code)
{
    struct exynos_tmu_platform_data *pdata = data->pdata;
    int temp;

    if (data->soc == SOC_ARCH_EXYNOS4210)
        /* temp_code should range between 75 and 175 */
        if (temp_code < 75 || temp_code > 175) {
            temp = -ENODATA;
            goto out;
        }

    switch (pdata->cal_type) {
    case TYPE_TWO_POINT_TRIMMING:
        temp = (temp_code - data->temp_error1) * (85 - 25) /
            (data->temp_error2 - data->temp_error1) + 25;
        break;
    case TYPE_ONE_POINT_TRIMMING:
        temp = temp_code - data->temp_error1 + 25;
        break;
    default:
        temp = temp_code - EXYNOS_TMU_DEF_CODE_TO_TEMP_OFFSET;
        break;
    }
out:
    return temp;
}

static int exynos_tmu_initialize(struct platform_device *pdev)
{
    struct exynos_tmu_data *data = platform_get_drvdata(pdev);
    struct exynos_tmu_platform_data *pdata = data->pdata;
    unsigned int status, trim_info, rising_threshold;
    int ret = 0, threshold_code;

    mutex_lock(&data->lock);
    clk_enable(data->clk);

    status = readb(data->base + EXYNOS_TMU_REG_STATUS);
    if (!status) {
        ret = -EBUSY;
        goto out;
    }

    if (data->soc == SOC_ARCH_EXYNOS) {
        __raw_writel(EXYNOS_TRIMINFO_RELOAD,
                data->base + EXYNOS_TMU_TRIMINFO_CON);
    }
    /* Save trimming info in order to perform calibration */
    trim_info = readl(data->base + EXYNOS_TMU_REG_TRIMINFO);
    data->temp_error1 = trim_info & EXYNOS_TMU_TRIM_TEMP_MASK;
    data->temp_error2 = ((trim_info >> 8) & EXYNOS_TMU_TRIM_TEMP_MASK);

    if ((EFUSE_MIN_VALUE > data->temp_error1) ||
            (data->temp_error1 > EFUSE_MAX_VALUE) ||
            (data->temp_error2 != 0))
        data->temp_error1 = pdata->efuse_value;

    if (data->soc == SOC_ARCH_EXYNOS4210) {
        /* Write temperature code for threshold */
        threshold_code = temp_to_code(data, pdata->threshold);
        if (threshold_code < 0) {
            ret = threshold_code;
            goto out;
        }
        writeb(threshold_code,
            data->base + EXYNOS4210_TMU_REG_THRESHOLD_TEMP);

        writeb(pdata->trigger_levels[0],
            data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL0);
        writeb(pdata->trigger_levels[1],
            data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL1);
        writeb(pdata->trigger_levels[2],
            data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL2);
        writeb(pdata->trigger_levels[3],
            data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL3);

        writel(EXYNOS4210_TMU_INTCLEAR_VAL,
            data->base + EXYNOS_TMU_REG_INTCLEAR);
    } else if (data->soc == SOC_ARCH_EXYNOS) {
        /* Write temperature code for threshold */
        threshold_code = temp_to_code(data, pdata->trigger_levels[0]);
        if (threshold_code < 0) {
            ret = threshold_code;
            goto out;
        }
        rising_threshold = threshold_code;
        threshold_code = temp_to_code(data, pdata->trigger_levels[1]);
        if (threshold_code < 0) {
            ret = threshold_code;
            goto out;
        }
        rising_threshold |= (threshold_code << 8);
        threshold_code = temp_to_code(data, pdata->trigger_levels[2]);
        if (threshold_code < 0) {
            ret = threshold_code;
            goto out;
        }
        rising_threshold |= (threshold_code << 16);

        writel(rising_threshold,
                data->base + EXYNOS_THD_TEMP_RISE);
        writel(0, data->base + EXYNOS_THD_TEMP_FALL);

        writel(EXYNOS_TMU_CLEAR_RISE_INT|EXYNOS_TMU_CLEAR_FALL_INT,
                data->base + EXYNOS_TMU_REG_INTCLEAR);
    }
out:
    clk_disable(data->clk);
    mutex_unlock(&data->lock);

    return ret;
}

static void exynos_tmu_control(struct platform_device *pdev, bool on)
{
    struct exynos_tmu_data *data = platform_get_drvdata(pdev);
    struct exynos_tmu_platform_data *pdata = data->pdata;
    unsigned int con, interrupt_en;

    mutex_lock(&data->lock);
    clk_enable(data->clk);

    con = pdata->reference_voltage << EXYNOS_TMU_REF_VOLTAGE_SHIFT |
        pdata->gain << EXYNOS_TMU_GAIN_SHIFT;

    if (data->soc == SOC_ARCH_EXYNOS) {
        con |= pdata->noise_cancel_mode << EXYNOS_TMU_TRIP_MODE_SHIFT;
        con |= (EXYNOS_MUX_ADDR_VALUE << EXYNOS_MUX_ADDR_SHIFT);
    }

    if (on) {
        con |= EXYNOS_TMU_CORE_ON;
        interrupt_en = pdata->trigger_level3_en << 12 |
            pdata->trigger_level2_en << 8 |
            pdata->trigger_level1_en << 4 |
            pdata->trigger_level0_en;
    } else {
        con |= EXYNOS_TMU_CORE_OFF;
        interrupt_en = 0; /* Disable all interrupts */
    }
    writel(interrupt_en, data->base + EXYNOS_TMU_REG_INTEN);
    writel(con, data->base + EXYNOS_TMU_REG_CONTROL);

    clk_disable(data->clk);
    mutex_unlock(&data->lock);
}

static int exynos_tmu_read(struct exynos_tmu_data *data)
{
    u8 temp_code;
    int temp;

    mutex_lock(&data->lock);
    clk_enable(data->clk);

    temp_code = readb(data->base + EXYNOS_TMU_REG_CURRENT_TEMP);
    temp = code_to_temp(data, temp_code);

    clk_disable(data->clk);
    mutex_unlock(&data->lock);

    return temp;
}

static void exynos_tmu_work(struct work_struct *work)
{
    struct exynos_tmu_data *data = container_of(work,
            struct exynos_tmu_data, irq_work);

    mutex_lock(&data->lock);
    clk_enable(data->clk);


    if (data->soc == SOC_ARCH_EXYNOS)
        writel(EXYNOS_TMU_CLEAR_RISE_INT,
                data->base + EXYNOS_TMU_REG_INTCLEAR);
    else
        writel(EXYNOS4210_TMU_INTCLEAR_VAL,
                data->base + EXYNOS_TMU_REG_INTCLEAR);

    clk_disable(data->clk);
    mutex_unlock(&data->lock);
    exynos_report_trigger();
    enable_irq(data->irq);
}

static irqreturn_t exynos_tmu_irq(int irq, void *id)
{
    struct exynos_tmu_data *data = id;

    disable_irq_nosync(irq);
    schedule_work(&data->irq_work);

    return IRQ_HANDLED;
}
static struct thermal_sensor_conf exynos_sensor_conf = {
    .name           = "exynos-therm",
    .read_temperature   = (int (*)(void *))exynos_tmu_read,
};

#if defined(CONFIG_CPU_EXYNOS4210)
static struct exynos_tmu_platform_data const exynos4210_default_tmu_data = {
    .threshold = 80,
    .trigger_levels[0] = 5,
    .trigger_levels[1] = 20,
    .trigger_levels[2] = 30,
    .trigger_level0_en = 1,
    .trigger_level1_en = 1,
    .trigger_level2_en = 1,
    .trigger_level3_en = 0,
    .gain = 15,
    .reference_voltage = 7,
    .cal_type = TYPE_ONE_POINT_TRIMMING,
    .freq_tab[0] = {
        .freq_clip_max = 800 * 1000,
        .temp_level = 85,
    },
    .freq_tab[1] = {
        .freq_clip_max = 200 * 1000,
        .temp_level = 100,
    },
    .freq_tab_count = 2,
    .type = SOC_ARCH_EXYNOS4210,
};
#define EXYNOS4210_TMU_DRV_DATA (&exynos4210_default_tmu_data)
#else
#define EXYNOS4210_TMU_DRV_DATA (NULL)
#endif

#if defined(CONFIG_SOC_EXYNOS5250) || defined(CONFIG_SOC_EXYNOS4412)
static struct exynos_tmu_platform_data const exynos_default_tmu_data = {
    .trigger_levels[0] = 85,
    .trigger_levels[1] = 103,
    .trigger_levels[2] = 110,
    .trigger_level0_en = 1,
    .trigger_level1_en = 1,
    .trigger_level2_en = 1,
    .trigger_level3_en = 0,
    .gain = 8,
    .reference_voltage = 16,
    .noise_cancel_mode = 4,
    .cal_type = TYPE_ONE_POINT_TRIMMING,
    .efuse_value = 55,
    .freq_tab[0] = {
        .freq_clip_max = 800 * 1000,
        .temp_level = 85,
    },
    .freq_tab[1] = {
        .freq_clip_max = 200 * 1000,
        .temp_level = 103,
    },
    .freq_tab_count = 2,
    .type = SOC_ARCH_EXYNOS,
};
#define EXYNOS_TMU_DRV_DATA (&exynos_default_tmu_data)
#else
#define EXYNOS_TMU_DRV_DATA (NULL)
#endif

#ifdef CONFIG_OF
static const struct of_device_id exynos_tmu_match[] = {
    {
        .compatible = "samsung,exynos4210-tmu",
        .data = (void *)EXYNOS4210_TMU_DRV_DATA,
    },
    {
        .compatible = "samsung,exynos5250-tmu",
        .data = (void *)EXYNOS_TMU_DRV_DATA,
    },
    {},
};
MODULE_DEVICE_TABLE(of, exynos_tmu_match);
#else
#define  exynos_tmu_match NULL
#endif

static struct platform_device_id exynos_tmu_driver_ids[] = {
    {
        .name       = "exynos4210-tmu",
        .driver_data    = (kernel_ulong_t)EXYNOS4210_TMU_DRV_DATA,
    },
    {
        .name       = "exynos5250-tmu",
        .driver_data    = (kernel_ulong_t)EXYNOS_TMU_DRV_DATA,
    },
    { },
};
MODULE_DEVICE_TABLE(platform, exynos_tmu_driver_ids);

static inline struct  exynos_tmu_platform_data *exynos_get_driver_data(
            struct platform_device *pdev)
{
#ifdef CONFIG_OF
    if (pdev->dev.of_node) {
        const struct of_device_id *match;
        match = of_match_node(exynos_tmu_match, pdev->dev.of_node);
        if (!match)
            return NULL;
        return (struct exynos_tmu_platform_data *) match->data;
    }
#endif
    return (struct exynos_tmu_platform_data *)
            platform_get_device_id(pdev)->driver_data;
}
static int __devinit exynos_tmu_probe(struct platform_device *pdev)
{
    struct exynos_tmu_data *data;
    struct exynos_tmu_platform_data *pdata = pdev->dev.platform_data;
    int ret, i;

    if (!pdata)
        pdata = exynos_get_driver_data(pdev);

    if (!pdata) {
        dev_err(&pdev->dev, "No platform init data supplied.\n");
        return -ENODEV;
    }
    data = devm_kzalloc(&pdev->dev, sizeof(struct exynos_tmu_data),
                    GFP_KERNEL);
    if (!data) {
        dev_err(&pdev->dev, "Failed to allocate driver structure\n");
        return -ENOMEM;
    }

    data->irq = platform_get_irq(pdev, 0);
    if (data->irq < 0) {
        dev_err(&pdev->dev, "Failed to get platform irq\n");
        return data->irq;
    }

    INIT_WORK(&data->irq_work, exynos_tmu_work);

    data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!data->mem) {
        dev_err(&pdev->dev, "Failed to get platform resource\n");
        return -ENOENT;
    }

    data->base = devm_request_and_ioremap(&pdev->dev, data->mem);
    if (!data->base) {
        dev_err(&pdev->dev, "Failed to ioremap memory\n");
        return -ENODEV;
    }

    ret = devm_request_irq(&pdev->dev, data->irq, exynos_tmu_irq,
        IRQF_TRIGGER_RISING, "exynos-tmu", data);
    if (ret) {
        dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
        return ret;
    }

    data->clk = clk_get(NULL, "tmu_apbif");
    if (IS_ERR(data->clk)) {
        dev_err(&pdev->dev, "Failed to get clock\n");
        return  PTR_ERR(data->clk);
    }

    if (pdata->type == SOC_ARCH_EXYNOS ||
                pdata->type == SOC_ARCH_EXYNOS4210)
        data->soc = pdata->type;
    else {
        ret = -EINVAL;
        dev_err(&pdev->dev, "Platform not supported\n");
        goto err_clk;
    }

    data->pdata = pdata;
    platform_set_drvdata(pdev, data);
    mutex_init(&data->lock);

    ret = exynos_tmu_initialize(pdev);
    if (ret) {
        dev_err(&pdev->dev, "Failed to initialize TMU\n");
        goto err_clk;
    }

    exynos_tmu_control(pdev, true);

    /* Register the sensor with thermal management interface */
    (&exynos_sensor_conf)->private_data = data;
    exynos_sensor_conf.trip_data.trip_count = pdata->trigger_level0_en +
            pdata->trigger_level1_en + pdata->trigger_level2_en +
            pdata->trigger_level3_en;

    for (i = 0; i < exynos_sensor_conf.trip_data.trip_count; i++)
        exynos_sensor_conf.trip_data.trip_val[i] =
            pdata->threshold + pdata->trigger_levels[i];

    exynos_sensor_conf.cooling_data.freq_clip_count =
                        pdata->freq_tab_count;
    for (i = 0; i < pdata->freq_tab_count; i++) {
        exynos_sensor_conf.cooling_data.freq_data[i].freq_clip_max =
                    pdata->freq_tab[i].freq_clip_max;
        exynos_sensor_conf.cooling_data.freq_data[i].temp_level =
                    pdata->freq_tab[i].temp_level;
    }

    ret = exynos_register_thermal(&exynos_sensor_conf);
    if (ret) {
        dev_err(&pdev->dev, "Failed to register thermal interface\n");
        goto err_clk;
    }
    return 0;
err_clk:
    platform_set_drvdata(pdev, NULL);
    clk_put(data->clk);
    return ret;
}

static int __devexit exynos_tmu_remove(struct platform_device *pdev)
{
    struct exynos_tmu_data *data = platform_get_drvdata(pdev);

    exynos_tmu_control(pdev, false);

    exynos_unregister_thermal();

    clk_put(data->clk);

    platform_set_drvdata(pdev, NULL);

    return 0;
}

#ifdef CONFIG_PM_SLEEP
static int exynos_tmu_suspend(struct device *dev)
{
    exynos_tmu_control(to_platform_device(dev), false);

    return 0;
}

static int exynos_tmu_resume(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);

    exynos_tmu_initialize(pdev);
    exynos_tmu_control(pdev, true);

    return 0;
}

static SIMPLE_DEV_PM_OPS(exynos_tmu_pm,
             exynos_tmu_suspend, exynos_tmu_resume);
#define EXYNOS_TMU_PM   (&exynos_tmu_pm)
#else
#define EXYNOS_TMU_PM   NULL
#endif

static struct platform_driver exynos_tmu_driver = {
    .driver = {
        .name   = "exynos-tmu",
        .owner  = THIS_MODULE,
        .pm     = EXYNOS_TMU_PM,
        .of_match_table = exynos_tmu_match,
    },
    .probe = exynos_tmu_probe,
    .remove = __devexit_p(exynos_tmu_remove),
    .id_table = exynos_tmu_driver_ids,
};

module_platform_driver(exynos_tmu_driver);

MODULE_DESCRIPTION("EXYNOS TMU Driver");
MODULE_AUTHOR("Donggeun Kim <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:exynos-tmu");