[mirror_ubuntu-bionic-kernel.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/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 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_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);

	data->cdev = cpufreq_cooling_register(cpu_present_mask);
	if (IS_ERR(data->cdev)) {
		ret = PTR_ERR(data->cdev);
		if (ret != -EPROBE_DEFER)
			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;
	clk_disable_unprepare(data->thermal_clk);

	return 0;
}

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

	clk_prepare_enable(data->thermal_clk);
	/* Enabled thermal sensor after resume */
	regmap_write(map, 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",
		.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	11	#include <linux/cpu_cooling.h>
ca3de46b SG	12	#include <linux/delay.h>
	13	#include <linux/device.h>
	14	#include <linux/init.h>
37713a1e	15	#include <linux/interrupt.h>
ca3de46b SG	16	#include <linux/io.h>
	17	#include <linux/kernel.h>
	18	#include <linux/mfd/syscon.h>
	19	#include <linux/module.h>
	20	#include <linux/of.h>
3c94f17e	21	#include <linux/of_device.h>
ca3de46b SG	22	#include <linux/platform_device.h>
	23	#include <linux/regmap.h>
	24	#include <linux/slab.h>
	25	#include <linux/thermal.h>
	26	#include <linux/types.h>
	27
	28	#define REG_SET 0x4
	29	#define REG_CLR 0x8
	30	#define REG_TOG 0xc
	31
	32	#define MISC0 0x0150
	33	#define MISC0_REFTOP_SELBIASOFF (1 << 3)
3c94f17e AH	34	#define MISC1 0x0160
	35	#define MISC1_IRQ_TEMPHIGH (1 << 29)
	36	/* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
	37	#define MISC1_IRQ_TEMPLOW (1 << 28)
	38	#define MISC1_IRQ_TEMPPANIC (1 << 27)
ca3de46b SG	39
ca3de46b SG	40	#define TEMPSENSE0 0x0180
37713a1e PZ	41	#define TEMPSENSE0_ALARM_VALUE_SHIFT 20
37713a1e PZ	42	#define TEMPSENSE0_ALARM_VALUE_MASK (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT)
ca3de46b SG	43	#define TEMPSENSE0_TEMP_CNT_SHIFT 8
	44	#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
	45	#define TEMPSENSE0_FINISHED (1 << 2)
	46	#define TEMPSENSE0_MEASURE_TEMP (1 << 1)
	47	#define TEMPSENSE0_POWER_DOWN (1 << 0)
	48
	49	#define TEMPSENSE1 0x0190
	50	#define TEMPSENSE1_MEASURE_FREQ 0xffff
3c94f17e AH	51	/* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
	52	#define TEMPSENSE2 0x0290
	53	#define TEMPSENSE2_LOW_VALUE_SHIFT 0
	54	#define TEMPSENSE2_LOW_VALUE_MASK 0xfff
	55	#define TEMPSENSE2_PANIC_VALUE_SHIFT 16
	56	#define TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
ca3de46b SG	57
	58	#define OCOTP_ANA1 0x04e0
	59
	60	/* The driver supports 1 passive trip point and 1 critical trip point */
	61	enum imx_thermal_trip {
	62	IMX_TRIP_PASSIVE,
	63	IMX_TRIP_CRITICAL,
	64	IMX_TRIP_NUM,
	65	};
	66
	67	/*
	68	* It defines the temperature in millicelsius for passive trip point
	69	* that will trigger cooling action when crossed.
	70	*/
	71	#define IMX_TEMP_PASSIVE 85000
	72
ca3de46b SG	73	#define IMX_POLLING_DELAY 2000 /* millisecond */
	74	#define IMX_PASSIVE_DELAY 1000
	75
749e8be7 AH	76	#define FACTOR0 10000000
	77	#define FACTOR1 15976
	78	#define FACTOR2 4297157
	79
3c94f17e AH	80	#define TEMPMON_IMX6Q 1
	81	#define TEMPMON_IMX6SX 2
	82
	83	struct thermal_soc_data {
	84	u32 version;
	85	};
	86
	87	static struct thermal_soc_data thermal_imx6q_data = {
	88	.version = TEMPMON_IMX6Q,
	89	};
	90
	91	static struct thermal_soc_data thermal_imx6sx_data = {
	92	.version = TEMPMON_IMX6SX,
	93	};
	94
ca3de46b SG	95	struct imx_thermal_data {
	96	struct thermal_zone_device *tz;
	97	struct thermal_cooling_device *cdev;
	98	enum thermal_device_mode mode;
	99	struct regmap *tempmon;
749e8be7	100	u32 c1, c2; /* See formula in imx_get_sensor_data() */
017e5142 PZ	101	unsigned long temp_passive;
017e5142 PZ	102	unsigned long temp_critical;
37713a1e PZ	103	unsigned long alarm_temp;
	104	unsigned long last_temp;
	105	bool irq_enabled;
	106	int irq;
329fe7b1	107	struct clk *thermal_clk;
3c94f17e	108	const struct thermal_soc_data *socdata;
ca3de46b SG	109	};
ca3de46b SG	110
3c94f17e AH	111	static void imx_set_panic_temp(struct imx_thermal_data *data,
	112	signed long panic_temp)
	113	{
	114	struct regmap *map = data->tempmon;
	115	int critical_value;
	116
	117	critical_value = (data->c2 - panic_temp) / data->c1;
	118	regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
	119	regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
	120	TEMPSENSE2_PANIC_VALUE_SHIFT);
	121	}
	122
37713a1e PZ	123	static void imx_set_alarm_temp(struct imx_thermal_data *data,
	124	signed long alarm_temp)
	125	{
	126	struct regmap *map = data->tempmon;
	127	int alarm_value;
	128
	129	data->alarm_temp = alarm_temp;
749e8be7	130	alarm_value = (data->c2 - alarm_temp) / data->c1;
37713a1e PZ	131	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
	132	regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
	133	TEMPSENSE0_ALARM_VALUE_SHIFT);
	134	}
	135
ca3de46b SG	136	static int imx_get_temp(struct thermal_zone_device tz, unsigned long temp)
	137	{
	138	struct imx_thermal_data *data = tz->devdata;
	139	struct regmap *map = data->tempmon;
ca3de46b	140	unsigned int n_meas;
37713a1e	141	bool wait;
ca3de46b SG	142	u32 val;
ca3de46b SG	143
37713a1e PZ	144	if (data->mode == THERMAL_DEVICE_ENABLED) {
	145	/* Check if a measurement is currently in progress */
	146	regmap_read(map, TEMPSENSE0, &val);
	147	wait = !(val & TEMPSENSE0_FINISHED);
	148	} else {
	149	/*
	150	* Every time we measure the temperature, we will power on the
	151	* temperature sensor, enable measurements, take a reading,
	152	* disable measurements, power off the temperature sensor.
	153	*/
	154	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	155	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
	156
	157	wait = true;
	158	}
ca3de46b SG	159
	160	/*
	161	* According to the temp sensor designers, it may require up to ~17us
	162	* to complete a measurement.
	163	*/
37713a1e PZ	164	if (wait)
37713a1e PZ	165	usleep_range(20, 50);
ca3de46b SG	166
ca3de46b SG	167	regmap_read(map, TEMPSENSE0, &val);
37713a1e PZ	168
	169	if (data->mode != THERMAL_DEVICE_ENABLED) {
	170	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
	171	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
	172	}
ca3de46b SG	173
	174	if ((val & TEMPSENSE0_FINISHED) == 0) {
	175	dev_dbg(&tz->device, "temp measurement never finished\n");
	176	return -EAGAIN;
	177	}
	178
	179	n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
	180
	181	/* See imx_get_sensor_data() for formula derivation */
749e8be7	182	temp = data->c2 - n_meas data->c1;
ca3de46b	183
3c94f17e AH	184	/* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
	185	if (data->socdata->version == TEMPMON_IMX6Q) {
	186	if (data->alarm_temp == data->temp_passive &&
	187	*temp >= data->temp_passive)
	188	imx_set_alarm_temp(data, data->temp_critical);
	189	if (data->alarm_temp == data->temp_critical &&
	190	*temp < data->temp_passive) {
	191	imx_set_alarm_temp(data, data->temp_passive);
	192	dev_dbg(&tz->device, "thermal alarm off: T < %lu\n",
	193	data->alarm_temp / 1000);
	194	}
37713a1e PZ	195	}
	196
	197	if (*temp != data->last_temp) {
ca3de46b	198	dev_dbg(&tz->device, "millicelsius: %ld\n", *temp);
37713a1e PZ	199	data->last_temp = *temp;
	200	}
	201
	202	/* Reenable alarm IRQ if temperature below alarm temperature */
	203	if (!data->irq_enabled && *temp < data->alarm_temp) {
	204	data->irq_enabled = true;
	205	enable_irq(data->irq);
ca3de46b SG	206	}
	207
	208	return 0;
	209	}
	210
	211	static int imx_get_mode(struct thermal_zone_device *tz,
	212	enum thermal_device_mode *mode)
	213	{
	214	struct imx_thermal_data *data = tz->devdata;
	215
	216	*mode = data->mode;
	217
	218	return 0;
	219	}
	220
	221	static int imx_set_mode(struct thermal_zone_device *tz,
	222	enum thermal_device_mode mode)
	223	{
	224	struct imx_thermal_data *data = tz->devdata;
37713a1e	225	struct regmap *map = data->tempmon;
ca3de46b SG	226
	227	if (mode == THERMAL_DEVICE_ENABLED) {
	228	tz->polling_delay = IMX_POLLING_DELAY;
	229	tz->passive_delay = IMX_PASSIVE_DELAY;
37713a1e PZ	230
	231	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	232	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
	233
	234	if (!data->irq_enabled) {
	235	data->irq_enabled = true;
	236	enable_irq(data->irq);
	237	}
ca3de46b	238	} else {
37713a1e PZ	239	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
	240	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
	241
ca3de46b SG	242	tz->polling_delay = 0;
ca3de46b SG	243	tz->passive_delay = 0;
37713a1e PZ	244
	245	if (data->irq_enabled) {
	246	disable_irq(data->irq);
	247	data->irq_enabled = false;
	248	}
ca3de46b SG	249	}
	250
	251	data->mode = mode;
	252	thermal_zone_device_update(tz);
	253
	254	return 0;
	255	}
	256
	257	static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
	258	enum thermal_trip_type *type)
	259	{
	260	*type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
	261	THERMAL_TRIP_CRITICAL;
	262	return 0;
	263	}
	264
	265	static int imx_get_crit_temp(struct thermal_zone_device *tz,
	266	unsigned long *temp)
	267	{
017e5142 PZ	268	struct imx_thermal_data *data = tz->devdata;
	269
	270	*temp = data->temp_critical;
ca3de46b SG	271	return 0;
	272	}
	273
	274	static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
	275	unsigned long *temp)
	276	{
017e5142 PZ	277	struct imx_thermal_data *data = tz->devdata;
	278
	279	*temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
	280	data->temp_critical;
	281	return 0;
	282	}
	283
	284	static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
	285	unsigned long temp)
	286	{
	287	struct imx_thermal_data *data = tz->devdata;
	288
	289	if (trip == IMX_TRIP_CRITICAL)
	290	return -EPERM;
	291
	292	if (temp > IMX_TEMP_PASSIVE)
	293	return -EINVAL;
	294
	295	data->temp_passive = temp;
	296
37713a1e PZ	297	imx_set_alarm_temp(data, temp);
37713a1e PZ	298
ca3de46b SG	299	return 0;
	300	}
	301
	302	static int imx_bind(struct thermal_zone_device *tz,
	303	struct thermal_cooling_device *cdev)
	304	{
	305	int ret;
	306
	307	ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
	308	THERMAL_NO_LIMIT,
	309	THERMAL_NO_LIMIT);
	310	if (ret) {
	311	dev_err(&tz->device,
	312	"binding zone %s with cdev %s failed:%d\n",
	313	tz->type, cdev->type, ret);
	314	return ret;
	315	}
	316
	317	return 0;
	318	}
	319
	320	static int imx_unbind(struct thermal_zone_device *tz,
	321	struct thermal_cooling_device *cdev)
	322	{
	323	int ret;
	324
	325	ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
	326	if (ret) {
	327	dev_err(&tz->device,
	328	"unbinding zone %s with cdev %s failed:%d\n",
	329	tz->type, cdev->type, ret);
	330	return ret;
	331	}
	332
	333	return 0;
	334	}
	335
cbb07bb3	336	static struct thermal_zone_device_ops imx_tz_ops = {
ca3de46b SG	337	.bind = imx_bind,
	338	.unbind = imx_unbind,
	339	.get_temp = imx_get_temp,
	340	.get_mode = imx_get_mode,
	341	.set_mode = imx_set_mode,
	342	.get_trip_type = imx_get_trip_type,
	343	.get_trip_temp = imx_get_trip_temp,
	344	.get_crit_temp = imx_get_crit_temp,
017e5142	345	.set_trip_temp = imx_set_trip_temp,
ca3de46b SG	346	};
	347
	348	static int imx_get_sensor_data(struct platform_device *pdev)
	349	{
	350	struct imx_thermal_data *data = platform_get_drvdata(pdev);
	351	struct regmap *map;
d0f9d64a	352	int t1, n1;
ca3de46b SG	353	int ret;
ca3de46b SG	354	u32 val;
749e8be7	355	u64 temp64;
ca3de46b SG	356
	357	map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
	358	"fsl,tempmon-data");
	359	if (IS_ERR(map)) {
	360	ret = PTR_ERR(map);
	361	dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
	362	return ret;
	363	}
	364
	365	ret = regmap_read(map, OCOTP_ANA1, &val);
	366	if (ret) {
	367	dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
	368	return ret;
	369	}
	370
	371	if (val == 0 \|\| val == ~0) {
	372	dev_err(&pdev->dev, "invalid sensor calibration data\n");
	373	return -EINVAL;
	374	}
	375
	376	/*
	377	* Sensor data layout:
	378	* [31:20] - sensor value @ 25C
749e8be7 AH	379	* Use universal formula now and only need sensor value @ 25C
749e8be7 AH	380	* slope = 0.4297157 - (0.0015976 * 25C fuse)
ca3de46b SG	381	*/
ca3de46b SG	382	n1 = val >> 20;
ca3de46b SG	383	t1 = 25; /* t1 always 25C */
	384
	385	/*
749e8be7 AH	386	* Derived from linear interpolation:
	387	* slope = 0.4297157 - (0.0015976 * 25C fuse)
	388	* slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
	389	* (Nmeas - n1) / (Tmeas - t1) = slope
ca3de46b SG	390	* We want to reduce this down to the minimum computation necessary
	391	* for each temperature read. Also, we want Tmeas in millicelsius
	392	* and we don't want to lose precision from integer division. So...
749e8be7 AH	393	* Tmeas = (Nmeas - n1) / slope + t1
	394	* milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
	395	* milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
	396	* Let constant c1 = (-1000 / slope)
	397	* milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
	398	* Let constant c2 = n1 c1 + 1000 t1
	399	* milli_Tmeas = c2 - Nmeas * c1
ca3de46b	400	*/
749e8be7 AH	401	temp64 = FACTOR0;
	402	temp64 *= 1000;
	403	do_div(temp64, FACTOR1 * n1 - FACTOR2);
	404	data->c1 = temp64;
	405	data->c2 = n1 * data->c1 + 1000 * t1;
ca3de46b	406
017e5142	407	/*
d0f9d64a AH	408	* Set the default passive cooling trip point,
d0f9d64a AH	409	* can be changed from userspace.
017e5142	410	*/
d0f9d64a	411	data->temp_passive = IMX_TEMP_PASSIVE;
017e5142 PZ	412
017e5142 PZ	413	/*
d0f9d64a AH	414	* The maximum die temperature set to 20 C higher than
d0f9d64a AH	415	* IMX_TEMP_PASSIVE.
017e5142	416	*/
d0f9d64a	417	data->temp_critical = 1000 * 20 + data->temp_passive;
017e5142	418
ca3de46b SG	419	return 0;
	420	}
	421
37713a1e PZ	422	static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
	423	{
	424	struct imx_thermal_data *data = dev;
	425
	426	disable_irq_nosync(irq);
	427	data->irq_enabled = false;
	428
	429	return IRQ_WAKE_THREAD;
	430	}
	431
	432	static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
	433	{
	434	struct imx_thermal_data *data = dev;
	435
	436	dev_dbg(&data->tz->device, "THERMAL ALARM: T > %lu\n",
	437	data->alarm_temp / 1000);
	438
	439	thermal_zone_device_update(data->tz);
	440
	441	return IRQ_HANDLED;
	442	}
	443
3c94f17e AH	444	static const struct of_device_id of_imx_thermal_match[] = {
	445	{ .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
	446	{ .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
	447	{ /* end */ }
	448	};
	449	MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
	450
ca3de46b SG	451	static int imx_thermal_probe(struct platform_device *pdev)
ca3de46b SG	452	{
3c94f17e AH	453	const struct of_device_id *of_id =
3c94f17e AH	454	of_match_device(of_imx_thermal_match, &pdev->dev);
ca3de46b	455	struct imx_thermal_data *data;
ca3de46b	456	struct regmap *map;
37713a1e	457	int measure_freq;
ca3de46b SG	458	int ret;
	459
	460	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	461	if (!data)
	462	return -ENOMEM;
	463
	464	map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
	465	if (IS_ERR(map)) {
	466	ret = PTR_ERR(map);
	467	dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
	468	return ret;
	469	}
	470	data->tempmon = map;
	471
3c94f17e AH	472	data->socdata = of_id->data;
	473
	474	/* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
	475	if (data->socdata->version == TEMPMON_IMX6SX) {
	476	regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH \|
	477	MISC1_IRQ_TEMPLOW \| MISC1_IRQ_TEMPPANIC);
	478	/*
	479	* reset value of LOW ALARM is incorrect, set it to lowest
	480	* value to avoid false trigger of low alarm.
	481	*/
	482	regmap_write(map, TEMPSENSE2 + REG_SET,
	483	TEMPSENSE2_LOW_VALUE_MASK);
	484	}
	485
37713a1e PZ	486	data->irq = platform_get_irq(pdev, 0);
	487	if (data->irq < 0)
	488	return data->irq;
	489
	490	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
	491	imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
	492	0, "imx_thermal", data);
	493	if (ret < 0) {
	494	dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
	495	return ret;
	496	}
	497
ca3de46b SG	498	platform_set_drvdata(pdev, data);
	499
	500	ret = imx_get_sensor_data(pdev);
	501	if (ret) {
	502	dev_err(&pdev->dev, "failed to get sensor data\n");
	503	return ret;
	504	}
	505
	506	/* Make sure sensor is in known good state for measurements */
	507	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	508	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
	509	regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
	510	regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
	511	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
	512
bec85d2e	513	data->cdev = cpufreq_cooling_register(cpu_present_mask);
ca3de46b SG	514	if (IS_ERR(data->cdev)) {
ca3de46b SG	515	ret = PTR_ERR(data->cdev);
412aff94 FE	516	if (ret != -EPROBE_DEFER)
	517	dev_err(&pdev->dev,
	518	"failed to register cpufreq cooling device: %d\n",
	519	ret);
ca3de46b SG	520	return ret;
	521	}
	522
90a21ff5 HK	523	data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
	524	if (IS_ERR(data->thermal_clk)) {
	525	ret = PTR_ERR(data->thermal_clk);
	526	if (ret != -EPROBE_DEFER)
	527	dev_err(&pdev->dev,
	528	"failed to get thermal clk: %d\n", ret);
	529	cpufreq_cooling_unregister(data->cdev);
	530	return ret;
	531	}
	532
	533	/*
	534	* Thermal sensor needs clk on to get correct value, normally
	535	* we should enable its clk before taking measurement and disable
	536	* clk after measurement is done, but if alarm function is enabled,
	537	* hardware will auto measure the temperature periodically, so we
	538	* need to keep the clk always on for alarm function.
	539	*/
	540	ret = clk_prepare_enable(data->thermal_clk);
	541	if (ret) {
	542	dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
	543	cpufreq_cooling_unregister(data->cdev);
	544	return ret;
	545	}
	546
ca3de46b	547	data->tz = thermal_zone_device_register("imx_thermal_zone",
017e5142 PZ	548	IMX_TRIP_NUM,
017e5142 PZ	549	BIT(IMX_TRIP_PASSIVE), data,
ca3de46b SG	550	&imx_tz_ops, NULL,
	551	IMX_PASSIVE_DELAY,
	552	IMX_POLLING_DELAY);
	553	if (IS_ERR(data->tz)) {
	554	ret = PTR_ERR(data->tz);
	555	dev_err(&pdev->dev,
	556	"failed to register thermal zone device %d\n", ret);
90a21ff5	557	clk_disable_unprepare(data->thermal_clk);
ca3de46b SG	558	cpufreq_cooling_unregister(data->cdev);
	559	return ret;
	560	}
	561
37713a1e PZ	562	/* Enable measurements at ~ 10 Hz */
	563	regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
	564	measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
	565	regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
	566	imx_set_alarm_temp(data, data->temp_passive);
3c94f17e AH	567
	568	if (data->socdata->version == TEMPMON_IMX6SX)
	569	imx_set_panic_temp(data, data->temp_critical);
	570
37713a1e PZ	571	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	572	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
	573
	574	data->irq_enabled = true;
ca3de46b SG	575	data->mode = THERMAL_DEVICE_ENABLED;
	576
	577	return 0;
	578	}
	579
	580	static int imx_thermal_remove(struct platform_device *pdev)
	581	{
	582	struct imx_thermal_data *data = platform_get_drvdata(pdev);
37713a1e PZ	583	struct regmap *map = data->tempmon;
	584
	585	/* Disable measurements */
	586	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
329fe7b1 AH	587	if (!IS_ERR(data->thermal_clk))
329fe7b1 AH	588	clk_disable_unprepare(data->thermal_clk);
ca3de46b SG	589
	590	thermal_zone_device_unregister(data->tz);
	591	cpufreq_cooling_unregister(data->cdev);
	592
	593	return 0;
	594	}
	595
	596	#ifdef CONFIG_PM_SLEEP
	597	static int imx_thermal_suspend(struct device *dev)
	598	{
	599	struct imx_thermal_data *data = dev_get_drvdata(dev);
	600	struct regmap *map = data->tempmon;
ca3de46b	601
b46cce59 AH	602	/*
	603	* Need to disable thermal sensor, otherwise, when thermal core
	604	* try to get temperature before thermal sensor resume, a wrong
	605	* temperature will be read as the thermal sensor is powered
	606	* down.
	607	*/
	608	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
	609	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
	610	data->mode = THERMAL_DEVICE_DISABLED;
d26eef8b	611	clk_disable_unprepare(data->thermal_clk);
ca3de46b SG	612
	613	return 0;
	614	}
	615
	616	static int imx_thermal_resume(struct device *dev)
	617	{
b46cce59 AH	618	struct imx_thermal_data *data = dev_get_drvdata(dev);
	619	struct regmap *map = data->tempmon;
	620
d26eef8b	621	clk_prepare_enable(data->thermal_clk);
b46cce59 AH	622	/* Enabled thermal sensor after resume */
	623	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
	624	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
	625	data->mode = THERMAL_DEVICE_ENABLED;
	626
ca3de46b SG	627	return 0;
	628	}
	629	#endif
	630
	631	static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
	632	imx_thermal_suspend, imx_thermal_resume);
	633
ca3de46b SG	634	static struct platform_driver imx_thermal = {
	635	.driver = {
	636	.name = "imx_thermal",
ca3de46b SG	637	.pm = &imx_thermal_pm_ops,
	638	.of_match_table = of_imx_thermal_match,
	639	},
	640	.probe = imx_thermal_probe,
	641	.remove = imx_thermal_remove,
	642	};
	643	module_platform_driver(imx_thermal);
	644
	645	MODULE_AUTHOR("Freescale Semiconductor, Inc.");
	646	MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
	647	MODULE_LICENSE("GPL v2");
	648	MODULE_ALIAS("platform:imx-thermal");