[deliverable/linux.git] / drivers / thermal / imx_thermal.c

/*
 * Copyright 2013 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/clk.h>
#include <linux/cpu_cooling.h>
#include <linux/cpufreq.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>

#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)

#define TEMPSENSE0			0x0180
#define TEMPSENSE0_ALARM_VALUE_SHIFT	20
#define TEMPSENSE0_ALARM_VALUE_MASK	(0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT)
#define TEMPSENSE0_TEMP_CNT_SHIFT	8
#define TEMPSENSE0_TEMP_CNT_MASK	(0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
#define TEMPSENSE0_FINISHED		(1 << 2)
#define TEMPSENSE0_MEASURE_TEMP		(1 << 1)
#define TEMPSENSE0_POWER_DOWN		(1 << 0)

#define TEMPSENSE1			0x0190
#define TEMPSENSE1_MEASURE_FREQ		0xffff
/* 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

#define OCOTP_ANA1			0x04e0

/* 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_POLLING_DELAY		2000 /* millisecond */
#define IMX_PASSIVE_DELAY		1000

#define FACTOR0				10000000
#define FACTOR1				15976
#define FACTOR2				4297157

#define TEMPMON_IMX6Q			1
#define TEMPMON_IMX6SX			2

struct thermal_soc_data {
	u32 version;
};

static struct thermal_soc_data thermal_imx6q_data = {
	.version = TEMPMON_IMX6Q,
};

static struct thermal_soc_data thermal_imx6sx_data = {
	.version = TEMPMON_IMX6SX,
};

struct imx_thermal_data {
	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_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;
	const struct thermal_soc_data *socdata;
};

static void imx_set_panic_temp(struct imx_thermal_data *data,
			       signed long panic_temp)
{
	struct regmap *map = data->tempmon;
	int critical_value;

	critical_value = (data->c2 - panic_temp) / data->c1;
	regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
	regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
			TEMPSENSE2_PANIC_VALUE_SHIFT);
}

static void imx_set_alarm_temp(struct imx_thermal_data *data,
			       signed long alarm_temp)
{
	struct regmap *map = data->tempmon;
	int alarm_value;

	data->alarm_temp = alarm_temp;
	alarm_value = (data->c2 - alarm_temp) / data->c1;
	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
	regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
			TEMPSENSE0_ALARM_VALUE_SHIFT);
}

static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
{
	struct imx_thermal_data *data = tz->devdata;
	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, TEMPSENSE0, &val);
		wait = !(val & TEMPSENSE0_FINISHED);
	} 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, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
		regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);

		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, TEMPSENSE0, &val);

	if (data->mode != THERMAL_DEVICE_ENABLED) {
		regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
		regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
	}

	if ((val & TEMPSENSE0_FINISHED) == 0) {
		dev_dbg(&tz->device, "temp measurement never finished\n");
		return -EAGAIN;
	}

	n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;

	/* See imx_get_sensor_data() for formula derivation */
	*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);
	}

	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;

	if (mode == THERMAL_DEVICE_ENABLED) {
		tz->polling_delay = IMX_POLLING_DELAY;
		tz->passive_delay = IMX_PASSIVE_DELAY;

		regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
		regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);

		if (!data->irq_enabled) {
			data->irq_enabled = true;
			enable_irq(data->irq);
		}
	} else {
		regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
		regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);

		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)
		return -EPERM;

	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 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_get_sensor_data(struct platform_device *pdev)
{
	struct imx_thermal_data *data = platform_get_drvdata(pdev);
	struct regmap *map;
	int t1, n1;
	int ret;
	u32 val;
	u64 temp64;

	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;
	}

	if (val == 0 || val == ~0) {
		dev_err(&pdev->dev, "invalid sensor calibration data\n");
		return -EINVAL;
	}

	/*
	 * Sensor data layout:
	 *   [31:20] - sensor value @ 25C
	 * Use universal formula now and only need sensor value @ 25C
	 * slope = 0.4297157 - (0.0015976 * 25C fuse)
	 */
	n1 = val >> 20;
	t1 = 25; /* t1 always 25C */

	/*
	 * Derived from linear interpolation:
	 * slope = 0.4297157 - (0.0015976 * 25C fuse)
	 * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
	 * (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
	 * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
	 * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
	 * Let constant c1 = (-1000 / slope)
	 * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
	 * Let constant c2 = n1 *c1 + 1000 * t1
	 * milli_Tmeas = c2 - Nmeas * c1
	 */
	temp64 = FACTOR0;
	temp64 *= 1000;
	do_div(temp64, FACTOR1 * n1 - FACTOR2);
	data->c1 = temp64;
	data->c2 = n1 * data->c1 + 1000 * t1;

	/*
	 * Set the default passive cooling trip point,
	 * can be changed from userspace.
	 */
	data->temp_passive = IMX_TEMP_PASSIVE;

	/*
	 * The maximum die temperature set to 20 C higher than
	 * IMX_TEMP_PASSIVE.
	 */
	data->temp_critical = 1000 * 20 + data->temp_passive;

	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, },
	{ /* end */ }
};
MODULE_DEVICE_TABLE(of, of_imx_thermal_match);

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 cpumask clip_cpus;
	struct regmap *map;
	int measure_freq;
	int ret;

	if (!cpufreq_get_current_driver()) {
		dev_dbg(&pdev->dev, "no cpufreq driver!");
		return -EPROBE_DEFER;
	}
	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_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;

	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;
	}

	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;
	}

	/* Make sure sensor is in known good state for measurements */
	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
	regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
	regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);

	cpumask_set_cpu(0, &clip_cpus);
	data->cdev = cpufreq_cooling_register(&clip_cpus);
	if (IS_ERR(data->cdev)) {
		ret = PTR_ERR(data->cdev);
		dev_err(&pdev->dev,
			"failed to register cpufreq cooling device: %d\n", ret);
		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);
		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);
		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);
		return ret;
	}

	/* Enable measurements at ~ 10 Hz */
	regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
	measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
	regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
	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, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);

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

	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, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
	if (!IS_ERR(data->thermal_clk))
		clk_disable_unprepare(data->thermal_clk);

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

	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, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
	data->mode = THERMAL_DEVICE_DISABLED;

	return 0;
}

static int imx_thermal_resume(struct device *dev)
{
	struct imx_thermal_data *data = dev_get_drvdata(dev);
	struct regmap *map = data->tempmon;

	/* Enabled thermal sensor after resume */
	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
	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",
		.owner  = THIS_MODULE,
		.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");
Commit	Line	Data
ca3de46b SG	1	/*
	2	* Copyright 2013 Freescale Semiconductor, Inc.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	*/
	9
329fe7b1	10	#include <linux/clk.h>
ca3de46b SG	11	#include <linux/cpu_cooling.h>
	12	#include <linux/cpufreq.h>
	13	#include <linux/delay.h>
	14	#include <linux/device.h>
	15	#include <linux/init.h>
37713a1e	16	#include <linux/interrupt.h>
ca3de46b SG	17	#include <linux/io.h>
	18	#include <linux/kernel.h>
	19	#include <linux/mfd/syscon.h>
	20	#include <linux/module.h>
	21	#include <linux/of.h>
3c94f17e	22	#include <linux/of_device.h>
ca3de46b SG	23	#include <linux/platform_device.h>
	24	#include <linux/regmap.h>
	25	#include <linux/slab.h>
	26	#include <linux/thermal.h>
	27	#include <linux/types.h>
	28
	29	#define REG_SET 0x4
	30	#define REG_CLR 0x8
	31	#define REG_TOG 0xc
	32
	33	#define MISC0 0x0150
	34	#define MISC0_REFTOP_SELBIASOFF (1 << 3)
3c94f17e AH	35	#define MISC1 0x0160
	36	#define MISC1_IRQ_TEMPHIGH (1 << 29)
	37	/* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
	38	#define MISC1_IRQ_TEMPLOW (1 << 28)
	39	#define MISC1_IRQ_TEMPPANIC (1 << 27)
ca3de46b SG	40
ca3de46b SG	41	#define TEMPSENSE0 0x0180
37713a1e PZ	42	#define TEMPSENSE0_ALARM_VALUE_SHIFT 20
37713a1e PZ	43	#define TEMPSENSE0_ALARM_VALUE_MASK (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT)
ca3de46b SG	44	#define TEMPSENSE0_TEMP_CNT_SHIFT 8
	45	#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
	46	#define TEMPSENSE0_FINISHED (1 << 2)
	47	#define TEMPSENSE0_MEASURE_TEMP (1 << 1)
	48	#define TEMPSENSE0_POWER_DOWN (1 << 0)
	49
	50	#define TEMPSENSE1 0x0190
	51	#define TEMPSENSE1_MEASURE_FREQ 0xffff
3c94f17e AH	52	/* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
	53	#define TEMPSENSE2 0x0290
	54	#define TEMPSENSE2_LOW_VALUE_SHIFT 0
	55	#define TEMPSENSE2_LOW_VALUE_MASK 0xfff
	56	#define TEMPSENSE2_PANIC_VALUE_SHIFT 16
	57	#define TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
ca3de46b SG	58
	59	#define OCOTP_ANA1 0x04e0
	60
	61	/* The driver supports 1 passive trip point and 1 critical trip point */
	62	enum imx_thermal_trip {
	63	IMX_TRIP_PASSIVE,
	64	IMX_TRIP_CRITICAL,
	65	IMX_TRIP_NUM,
	66	};
	67
	68	/*
	69	* It defines the temperature in millicelsius for passive trip point
	70	* that will trigger cooling action when crossed.
	71	*/
	72	#define IMX_TEMP_PASSIVE 85000
	73
ca3de46b SG	74	#define IMX_POLLING_DELAY 2000 /* millisecond */
	75	#define IMX_PASSIVE_DELAY 1000
	76
749e8be7 AH	77	#define FACTOR0 10000000
	78	#define FACTOR1 15976
	79	#define FACTOR2 4297157
	80
3c94f17e AH	81	#define TEMPMON_IMX6Q 1
	82	#define TEMPMON_IMX6SX 2
	83
	84	struct thermal_soc_data {
	85	u32 version;
	86	};
	87
	88	static struct thermal_soc_data thermal_imx6q_data = {
	89	.version = TEMPMON_IMX6Q,
	90	};
	91
	92	static struct thermal_soc_data thermal_imx6sx_data = {
	93	.version = TEMPMON_IMX6SX,
	94	};
	95
ca3de46b SG	96	struct imx_thermal_data {
	97	struct thermal_zone_device *tz;
	98	struct thermal_cooling_device *cdev;
	99	enum thermal_device_mode mode;
	100	struct regmap *tempmon;
749e8be7	101	u32 c1, c2; /* See formula in imx_get_sensor_data() */
017e5142 PZ	102	unsigned long temp_passive;
017e5142 PZ	103	unsigned long temp_critical;
37713a1e PZ	104	unsigned long alarm_temp;
	105	unsigned long last_temp;
	106	bool irq_enabled;
	107	int irq;
329fe7b1	108	struct clk *thermal_clk;
3c94f17e	109	const struct thermal_soc_data *socdata;
ca3de46b SG	110	};
ca3de46b SG	111
3c94f17e AH	112	static void imx_set_panic_temp(struct imx_thermal_data *data,
	113	signed long panic_temp)
	114	{
	115	struct regmap *map = data->tempmon;
	116	int critical_value;
	117
	118	critical_value = (data->c2 - panic_temp) / data->c1;
	119	regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
	120	regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
	121	TEMPSENSE2_PANIC_VALUE_SHIFT);
	122	}
	123
37713a1e PZ	124	static void imx_set_alarm_temp(struct imx_thermal_data *data,
	125	signed long alarm_temp)
	126	{
	127	struct regmap *map = data->tempmon;
	128	int alarm_value;
	129
	130	data->alarm_temp = alarm_temp;
749e8be7	131	alarm_value = (data->c2 - alarm_temp) / data->c1;
37713a1e PZ	132	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
	133	regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
	134	TEMPSENSE0_ALARM_VALUE_SHIFT);
	135	}
	136
ca3de46b SG	137	static int imx_get_temp(struct thermal_zone_device tz, unsigned long temp)
	138	{
	139	struct imx_thermal_data *data = tz->devdata;
	140	struct regmap *map = data->tempmon;
ca3de46b	141	unsigned int n_meas;
37713a1e	142	bool wait;
ca3de46b SG	143	u32 val;
ca3de46b SG	144
37713a1e PZ	145	if (data->mode == THERMAL_DEVICE_ENABLED) {
	146	/* Check if a measurement is currently in progress */
	147	regmap_read(map, TEMPSENSE0, &val);
	148	wait = !(val & TEMPSENSE0_FINISHED);
	149	} else {
	150	/*
	151	* Every time we measure the temperature, we will power on the
	152	* temperature sensor, enable measurements, take a reading,
	153	* disable measurements, power off the temperature sensor.
	154	*/
	155	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	156	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
	157
	158	wait = true;
	159	}
ca3de46b SG	160
	161	/*
	162	* According to the temp sensor designers, it may require up to ~17us
	163	* to complete a measurement.
	164	*/
37713a1e PZ	165	if (wait)
37713a1e PZ	166	usleep_range(20, 50);
ca3de46b SG	167
ca3de46b SG	168	regmap_read(map, TEMPSENSE0, &val);
37713a1e PZ	169
	170	if (data->mode != THERMAL_DEVICE_ENABLED) {
	171	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
	172	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
	173	}
ca3de46b SG	174
	175	if ((val & TEMPSENSE0_FINISHED) == 0) {
	176	dev_dbg(&tz->device, "temp measurement never finished\n");
	177	return -EAGAIN;
	178	}
	179
	180	n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
	181
	182	/* See imx_get_sensor_data() for formula derivation */
749e8be7	183	temp = data->c2 - n_meas data->c1;
ca3de46b	184
3c94f17e AH	185	/* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
	186	if (data->socdata->version == TEMPMON_IMX6Q) {
	187	if (data->alarm_temp == data->temp_passive &&
	188	*temp >= data->temp_passive)
	189	imx_set_alarm_temp(data, data->temp_critical);
	190	if (data->alarm_temp == data->temp_critical &&
	191	*temp < data->temp_passive) {
	192	imx_set_alarm_temp(data, data->temp_passive);
	193	dev_dbg(&tz->device, "thermal alarm off: T < %lu\n",
	194	data->alarm_temp / 1000);
	195	}
37713a1e PZ	196	}
	197
	198	if (*temp != data->last_temp) {
ca3de46b	199	dev_dbg(&tz->device, "millicelsius: %ld\n", *temp);
37713a1e PZ	200	data->last_temp = *temp;
	201	}
	202
	203	/* Reenable alarm IRQ if temperature below alarm temperature */
	204	if (!data->irq_enabled && *temp < data->alarm_temp) {
	205	data->irq_enabled = true;
	206	enable_irq(data->irq);
ca3de46b SG	207	}
	208
	209	return 0;
	210	}
	211
	212	static int imx_get_mode(struct thermal_zone_device *tz,
	213	enum thermal_device_mode *mode)
	214	{
	215	struct imx_thermal_data *data = tz->devdata;
	216
	217	*mode = data->mode;
	218
	219	return 0;
	220	}
	221
	222	static int imx_set_mode(struct thermal_zone_device *tz,
	223	enum thermal_device_mode mode)
	224	{
	225	struct imx_thermal_data *data = tz->devdata;
37713a1e	226	struct regmap *map = data->tempmon;
ca3de46b SG	227
	228	if (mode == THERMAL_DEVICE_ENABLED) {
	229	tz->polling_delay = IMX_POLLING_DELAY;
	230	tz->passive_delay = IMX_PASSIVE_DELAY;
37713a1e PZ	231
	232	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	233	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
	234
	235	if (!data->irq_enabled) {
	236	data->irq_enabled = true;
	237	enable_irq(data->irq);
	238	}
ca3de46b	239	} else {
37713a1e PZ	240	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
	241	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
	242
ca3de46b SG	243	tz->polling_delay = 0;
ca3de46b SG	244	tz->passive_delay = 0;
37713a1e PZ	245
	246	if (data->irq_enabled) {
	247	disable_irq(data->irq);
	248	data->irq_enabled = false;
	249	}
ca3de46b SG	250	}
	251
	252	data->mode = mode;
	253	thermal_zone_device_update(tz);
	254
	255	return 0;
	256	}
	257
	258	static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
	259	enum thermal_trip_type *type)
	260	{
	261	*type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
	262	THERMAL_TRIP_CRITICAL;
	263	return 0;
	264	}
	265
	266	static int imx_get_crit_temp(struct thermal_zone_device *tz,
	267	unsigned long *temp)
	268	{
017e5142 PZ	269	struct imx_thermal_data *data = tz->devdata;
	270
	271	*temp = data->temp_critical;
ca3de46b SG	272	return 0;
	273	}
	274
	275	static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
	276	unsigned long *temp)
	277	{
017e5142 PZ	278	struct imx_thermal_data *data = tz->devdata;
	279
	280	*temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
	281	data->temp_critical;
	282	return 0;
	283	}
	284
	285	static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
	286	unsigned long temp)
	287	{
	288	struct imx_thermal_data *data = tz->devdata;
	289
	290	if (trip == IMX_TRIP_CRITICAL)
	291	return -EPERM;
	292
	293	if (temp > IMX_TEMP_PASSIVE)
	294	return -EINVAL;
	295
	296	data->temp_passive = temp;
	297
37713a1e PZ	298	imx_set_alarm_temp(data, temp);
37713a1e PZ	299
ca3de46b SG	300	return 0;
	301	}
	302
	303	static int imx_bind(struct thermal_zone_device *tz,
	304	struct thermal_cooling_device *cdev)
	305	{
	306	int ret;
	307
	308	ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
	309	THERMAL_NO_LIMIT,
	310	THERMAL_NO_LIMIT);
	311	if (ret) {
	312	dev_err(&tz->device,
	313	"binding zone %s with cdev %s failed:%d\n",
	314	tz->type, cdev->type, ret);
	315	return ret;
	316	}
	317
	318	return 0;
	319	}
	320
	321	static int imx_unbind(struct thermal_zone_device *tz,
	322	struct thermal_cooling_device *cdev)
	323	{
	324	int ret;
	325
	326	ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
	327	if (ret) {
	328	dev_err(&tz->device,
	329	"unbinding zone %s with cdev %s failed:%d\n",
	330	tz->type, cdev->type, ret);
	331	return ret;
	332	}
	333
	334	return 0;
	335	}
	336
cbb07bb3	337	static struct thermal_zone_device_ops imx_tz_ops = {
ca3de46b SG	338	.bind = imx_bind,
	339	.unbind = imx_unbind,
	340	.get_temp = imx_get_temp,
	341	.get_mode = imx_get_mode,
	342	.set_mode = imx_set_mode,
	343	.get_trip_type = imx_get_trip_type,
	344	.get_trip_temp = imx_get_trip_temp,
	345	.get_crit_temp = imx_get_crit_temp,
017e5142	346	.set_trip_temp = imx_set_trip_temp,
ca3de46b SG	347	};
	348
	349	static int imx_get_sensor_data(struct platform_device *pdev)
	350	{
	351	struct imx_thermal_data *data = platform_get_drvdata(pdev);
	352	struct regmap *map;
d0f9d64a	353	int t1, n1;
ca3de46b SG	354	int ret;
ca3de46b SG	355	u32 val;
749e8be7	356	u64 temp64;
ca3de46b SG	357
	358	map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
	359	"fsl,tempmon-data");
	360	if (IS_ERR(map)) {
	361	ret = PTR_ERR(map);
	362	dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
	363	return ret;
	364	}
	365
	366	ret = regmap_read(map, OCOTP_ANA1, &val);
	367	if (ret) {
	368	dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
	369	return ret;
	370	}
	371
	372	if (val == 0 \|\| val == ~0) {
	373	dev_err(&pdev->dev, "invalid sensor calibration data\n");
	374	return -EINVAL;
	375	}
	376
	377	/*
	378	* Sensor data layout:
	379	* [31:20] - sensor value @ 25C
749e8be7 AH	380	* Use universal formula now and only need sensor value @ 25C
749e8be7 AH	381	* slope = 0.4297157 - (0.0015976 * 25C fuse)
ca3de46b SG	382	*/
ca3de46b SG	383	n1 = val >> 20;
ca3de46b SG	384	t1 = 25; /* t1 always 25C */
	385
	386	/*
749e8be7 AH	387	* Derived from linear interpolation:
	388	* slope = 0.4297157 - (0.0015976 * 25C fuse)
	389	* slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
	390	* (Nmeas - n1) / (Tmeas - t1) = slope
ca3de46b SG	391	* We want to reduce this down to the minimum computation necessary
	392	* for each temperature read. Also, we want Tmeas in millicelsius
	393	* and we don't want to lose precision from integer division. So...
749e8be7 AH	394	* Tmeas = (Nmeas - n1) / slope + t1
	395	* milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
	396	* milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
	397	* Let constant c1 = (-1000 / slope)
	398	* milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
	399	* Let constant c2 = n1 c1 + 1000 t1
	400	* milli_Tmeas = c2 - Nmeas * c1
ca3de46b	401	*/
749e8be7 AH	402	temp64 = FACTOR0;
	403	temp64 *= 1000;
	404	do_div(temp64, FACTOR1 * n1 - FACTOR2);
	405	data->c1 = temp64;
	406	data->c2 = n1 * data->c1 + 1000 * t1;
ca3de46b	407
017e5142	408	/*
d0f9d64a AH	409	* Set the default passive cooling trip point,
d0f9d64a AH	410	* can be changed from userspace.
017e5142	411	*/
d0f9d64a	412	data->temp_passive = IMX_TEMP_PASSIVE;
017e5142 PZ	413
017e5142 PZ	414	/*
d0f9d64a AH	415	* The maximum die temperature set to 20 C higher than
d0f9d64a AH	416	* IMX_TEMP_PASSIVE.
017e5142	417	*/
d0f9d64a	418	data->temp_critical = 1000 * 20 + data->temp_passive;
017e5142	419
ca3de46b SG	420	return 0;
	421	}
	422
37713a1e PZ	423	static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
	424	{
	425	struct imx_thermal_data *data = dev;
	426
	427	disable_irq_nosync(irq);
	428	data->irq_enabled = false;
	429
	430	return IRQ_WAKE_THREAD;
	431	}
	432
	433	static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
	434	{
	435	struct imx_thermal_data *data = dev;
	436
	437	dev_dbg(&data->tz->device, "THERMAL ALARM: T > %lu\n",
	438	data->alarm_temp / 1000);
	439
	440	thermal_zone_device_update(data->tz);
	441
	442	return IRQ_HANDLED;
	443	}
	444
3c94f17e AH	445	static const struct of_device_id of_imx_thermal_match[] = {
	446	{ .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
	447	{ .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
	448	{ /* end */ }
	449	};
	450	MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
	451
ca3de46b SG	452	static int imx_thermal_probe(struct platform_device *pdev)
ca3de46b SG	453	{
3c94f17e AH	454	const struct of_device_id *of_id =
3c94f17e AH	455	of_match_device(of_imx_thermal_match, &pdev->dev);
ca3de46b SG	456	struct imx_thermal_data *data;
	457	struct cpumask clip_cpus;
	458	struct regmap *map;
37713a1e	459	int measure_freq;
ca3de46b SG	460	int ret;
ca3de46b SG	461
491b079d BP	462	if (!cpufreq_get_current_driver()) {
	463	dev_dbg(&pdev->dev, "no cpufreq driver!");
	464	return -EPROBE_DEFER;
	465	}
ca3de46b SG	466	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	467	if (!data)
	468	return -ENOMEM;
	469
	470	map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
	471	if (IS_ERR(map)) {
	472	ret = PTR_ERR(map);
	473	dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
	474	return ret;
	475	}
	476	data->tempmon = map;
	477
3c94f17e AH	478	data->socdata = of_id->data;
	479
	480	/* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
	481	if (data->socdata->version == TEMPMON_IMX6SX) {
	482	regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH \|
	483	MISC1_IRQ_TEMPLOW \| MISC1_IRQ_TEMPPANIC);
	484	/*
	485	* reset value of LOW ALARM is incorrect, set it to lowest
	486	* value to avoid false trigger of low alarm.
	487	*/
	488	regmap_write(map, TEMPSENSE2 + REG_SET,
	489	TEMPSENSE2_LOW_VALUE_MASK);
	490	}
	491
37713a1e PZ	492	data->irq = platform_get_irq(pdev, 0);
	493	if (data->irq < 0)
	494	return data->irq;
	495
	496	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
	497	imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
	498	0, "imx_thermal", data);
	499	if (ret < 0) {
	500	dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
	501	return ret;
	502	}
	503
ca3de46b SG	504	platform_set_drvdata(pdev, data);
	505
	506	ret = imx_get_sensor_data(pdev);
	507	if (ret) {
	508	dev_err(&pdev->dev, "failed to get sensor data\n");
	509	return ret;
	510	}
	511
	512	/* Make sure sensor is in known good state for measurements */
	513	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	514	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
	515	regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
	516	regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
	517	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
	518
	519	cpumask_set_cpu(0, &clip_cpus);
	520	data->cdev = cpufreq_cooling_register(&clip_cpus);
	521	if (IS_ERR(data->cdev)) {
	522	ret = PTR_ERR(data->cdev);
	523	dev_err(&pdev->dev,
	524	"failed to register cpufreq cooling device: %d\n", ret);
	525	return ret;
	526	}
	527
90a21ff5 HK	528	data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
	529	if (IS_ERR(data->thermal_clk)) {
	530	ret = PTR_ERR(data->thermal_clk);
	531	if (ret != -EPROBE_DEFER)
	532	dev_err(&pdev->dev,
	533	"failed to get thermal clk: %d\n", ret);
	534	cpufreq_cooling_unregister(data->cdev);
	535	return ret;
	536	}
	537
	538	/*
	539	* Thermal sensor needs clk on to get correct value, normally
	540	* we should enable its clk before taking measurement and disable
	541	* clk after measurement is done, but if alarm function is enabled,
	542	* hardware will auto measure the temperature periodically, so we
	543	* need to keep the clk always on for alarm function.
	544	*/
	545	ret = clk_prepare_enable(data->thermal_clk);
	546	if (ret) {
	547	dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
	548	cpufreq_cooling_unregister(data->cdev);
	549	return ret;
	550	}
	551
ca3de46b	552	data->tz = thermal_zone_device_register("imx_thermal_zone",
017e5142 PZ	553	IMX_TRIP_NUM,
017e5142 PZ	554	BIT(IMX_TRIP_PASSIVE), data,
ca3de46b SG	555	&imx_tz_ops, NULL,
	556	IMX_PASSIVE_DELAY,
	557	IMX_POLLING_DELAY);
	558	if (IS_ERR(data->tz)) {
	559	ret = PTR_ERR(data->tz);
	560	dev_err(&pdev->dev,
	561	"failed to register thermal zone device %d\n", ret);
90a21ff5	562	clk_disable_unprepare(data->thermal_clk);
ca3de46b SG	563	cpufreq_cooling_unregister(data->cdev);
	564	return ret;
	565	}
	566
37713a1e PZ	567	/* Enable measurements at ~ 10 Hz */
	568	regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
	569	measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
	570	regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
	571	imx_set_alarm_temp(data, data->temp_passive);
3c94f17e AH	572
	573	if (data->socdata->version == TEMPMON_IMX6SX)
	574	imx_set_panic_temp(data, data->temp_critical);
	575
37713a1e PZ	576	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	577	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
	578
	579	data->irq_enabled = true;
ca3de46b SG	580	data->mode = THERMAL_DEVICE_ENABLED;
	581
	582	return 0;
	583	}
	584
	585	static int imx_thermal_remove(struct platform_device *pdev)
	586	{
	587	struct imx_thermal_data *data = platform_get_drvdata(pdev);
37713a1e PZ	588	struct regmap *map = data->tempmon;
	589
	590	/* Disable measurements */
	591	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
329fe7b1 AH	592	if (!IS_ERR(data->thermal_clk))
329fe7b1 AH	593	clk_disable_unprepare(data->thermal_clk);
ca3de46b SG	594
	595	thermal_zone_device_unregister(data->tz);
	596	cpufreq_cooling_unregister(data->cdev);
	597
	598	return 0;
	599	}
	600
	601	#ifdef CONFIG_PM_SLEEP
	602	static int imx_thermal_suspend(struct device *dev)
	603	{
	604	struct imx_thermal_data *data = dev_get_drvdata(dev);
	605	struct regmap *map = data->tempmon;
ca3de46b	606
b46cce59 AH	607	/*
	608	* Need to disable thermal sensor, otherwise, when thermal core
	609	* try to get temperature before thermal sensor resume, a wrong
	610	* temperature will be read as the thermal sensor is powered
	611	* down.
	612	*/
	613	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
	614	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
	615	data->mode = THERMAL_DEVICE_DISABLED;
ca3de46b SG	616
	617	return 0;
	618	}
	619
	620	static int imx_thermal_resume(struct device *dev)
	621	{
b46cce59 AH	622	struct imx_thermal_data *data = dev_get_drvdata(dev);
	623	struct regmap *map = data->tempmon;
	624
	625	/* Enabled thermal sensor after resume */
	626	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	627	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
	628	data->mode = THERMAL_DEVICE_ENABLED;
	629
ca3de46b SG	630	return 0;
	631	}
	632	#endif
	633
	634	static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
	635	imx_thermal_suspend, imx_thermal_resume);
	636
ca3de46b SG	637	static struct platform_driver imx_thermal = {
	638	.driver = {
	639	.name = "imx_thermal",
	640	.owner = THIS_MODULE,
	641	.pm = &imx_thermal_pm_ops,
	642	.of_match_table = of_imx_thermal_match,
	643	},
	644	.probe = imx_thermal_probe,
	645	.remove = imx_thermal_remove,
	646	};
	647	module_platform_driver(imx_thermal);
	648
	649	MODULE_AUTHOR("Freescale Semiconductor, Inc.");
	650	MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
	651	MODULE_LICENSE("GPL v2");
	652	MODULE_ALIAS("platform:imx-thermal");