drivers/thermal/hisi_thermal.c - linux-imx - Git at Google

 /*
  * Hisilicon thermal sensor driver
  *
  * Copyright (c) 2014-2015 Hisilicon Limited.
  * Copyright (c) 2014-2015 Linaro Limited.
  *
  * Xinwei Kong <kong.kongxinwei@hisilicon.com>
  * Leo Yan <leo.yan@linaro.org>
  *
  * 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.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  * kind, whether express or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  */

 #include <linux/cpufreq.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>

 #include "thermal_core.h"

 #define TEMP0_LAG			(0x0)
 #define TEMP0_TH			(0x4)
 #define TEMP0_RST_TH			(0x8)
 #define TEMP0_CFG			(0xC)
 #define TEMP0_CFG_SS_MSK		(0xF000)
 #define TEMP0_CFG_HDAK_MSK		(0x30)
 #define TEMP0_EN			(0x10)
 #define TEMP0_INT_EN			(0x14)
 #define TEMP0_INT_CLR			(0x18)
 #define TEMP0_RST_MSK			(0x1C)
 #define TEMP0_VALUE			(0x28)

 #define HISI_TEMP_BASE			(-60000)
 #define HISI_TEMP_RESET			(100000)
 #define HISI_TEMP_STEP			(784)
 #define HISI_TEMP_LAG			(3500)

 #define HISI_MAX_SENSORS		4
 #define HISI_DEFAULT_SENSOR		2

 struct hisi_thermal_sensor {
 	struct hisi_thermal_data *thermal;
 	struct thermal_zone_device *tzd;

 	long sensor_temp;
 	uint32_t id;
 	uint32_t thres_temp;
 };

 struct hisi_thermal_data {
 	struct mutex thermal_lock;    /* protects register data */
 	struct platform_device *pdev;
 	struct clk *clk;
 	struct hisi_thermal_sensor sensors;
 	int irq;
 	void __iomem *regs;
 };

 /*
  * The temperature computation on the tsensor is as follow:
  *	Unit: millidegree Celsius
  *	Step: 255/200 (0.7843)
  *	Temperature base: -60°C
  *
  * The register is programmed in temperature steps, every step is 784
  * millidegree and begins at -60 000 m°C
  *
  * The temperature from the steps:
  *
  *	Temp = TempBase + (steps x 784)
  *
  * and the steps from the temperature:
  *
  *	steps = (Temp - TempBase) / 784
  *
  */
 static inline int hisi_thermal_step_to_temp(int step)
 {
 	return HISI_TEMP_BASE + (step * HISI_TEMP_STEP);
 }

 static inline long hisi_thermal_temp_to_step(long temp)
 {
 	return (temp - HISI_TEMP_BASE) / HISI_TEMP_STEP;
 }

 static inline long hisi_thermal_round_temp(int temp)
 {
 	return hisi_thermal_step_to_temp(
 		hisi_thermal_temp_to_step(temp));
 }

 /*
  * The lag register contains 5 bits encoding the temperature in steps.
  *
  * Each time the temperature crosses the threshold boundary, an
  * interrupt is raised. It could be when the temperature is going
  * above the threshold or below. However, if the temperature is
  * fluctuating around this value due to the load, we can receive
  * several interrupts which may not desired.
  *
  * We can setup a temperature representing the delta between the
  * threshold and the current temperature when the temperature is
  * decreasing.
  *
  * For instance: the lag register is 5°C, the threshold is 65°C, when
  * the temperature reaches 65°C an interrupt is raised and when the
  * temperature decrease to 65°C - 5°C another interrupt is raised.
  *
  * A very short lag can lead to an interrupt storm, a long lag
  * increase the latency to react to the temperature changes.  In our
  * case, that is not really a problem as we are polling the
  * temperature.
  *
  * [0:4] : lag register
  *
  * The temperature is coded in steps, cf. HISI_TEMP_STEP.
  *
  * Min : 0x00 :  0.0 °C
  * Max : 0x1F : 24.3 °C
  *
  * The 'value' parameter is in milliCelsius.
  */
 static inline void hisi_thermal_set_lag(void __iomem *addr, int value)
 {
 	writel((value / HISI_TEMP_STEP) & 0x1F, addr + TEMP0_LAG);
 }

 static inline void hisi_thermal_alarm_clear(void __iomem *addr, int value)
 {
 	writel(value, addr + TEMP0_INT_CLR);
 }

 static inline void hisi_thermal_alarm_enable(void __iomem *addr, int value)
 {
 	writel(value, addr + TEMP0_INT_EN);
 }

 static inline void hisi_thermal_alarm_set(void __iomem *addr, int temp)
 {
 	writel(hisi_thermal_temp_to_step(temp) | 0x0FFFFFF00, addr + TEMP0_TH);
 }

 static inline void hisi_thermal_reset_set(void __iomem *addr, int temp)
 {
 	writel(hisi_thermal_temp_to_step(temp), addr + TEMP0_RST_TH);
 }

 static inline void hisi_thermal_reset_enable(void __iomem *addr, int value)
 {
 	writel(value, addr + TEMP0_RST_MSK);
 }

 static inline void hisi_thermal_enable(void __iomem *addr, int value)
 {
 	writel(value, addr + TEMP0_EN);
 }

 static inline int hisi_thermal_get_temperature(void __iomem *addr)
 {
 	return hisi_thermal_step_to_temp(readl(addr + TEMP0_VALUE));
 }

 /*
  * Temperature configuration register - Sensor selection
  *
  * Bits [19:12]
  *
  * 0x0: local sensor (default)
  * 0x1: remote sensor 1 (ACPU cluster 1)
  * 0x2: remote sensor 2 (ACPU cluster 0)
  * 0x3: remote sensor 3 (G3D)
  */
 static inline void hisi_thermal_sensor_select(void __iomem *addr, int sensor)
 {
 	writel((readl(addr + TEMP0_CFG) & ~TEMP0_CFG_SS_MSK) |
 	       (sensor << 12), addr + TEMP0_CFG);
 }

 /*
  * Temperature configuration register - Hdak conversion polling interval
  *
  * Bits [5:4]
  *
  * 0x0 :   0.768 ms
  * 0x1 :   6.144 ms
  * 0x2 :  49.152 ms
  * 0x3 : 393.216 ms
  */
 static inline void hisi_thermal_hdak_set(void __iomem *addr, int value)
 {
 	writel((readl(addr + TEMP0_CFG) & ~TEMP0_CFG_HDAK_MSK) |
 	       (value << 4), addr + TEMP0_CFG);
 }

 static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data)
 {
 	mutex_lock(&data->thermal_lock);

 	/* disable sensor module */
 	hisi_thermal_enable(data->regs, 0);
 	hisi_thermal_alarm_enable(data->regs, 0);
 	hisi_thermal_reset_enable(data->regs, 0);

 	mutex_unlock(&data->thermal_lock);
 }

 static int hisi_thermal_get_temp(void *_sensor, int *temp)
 {
 	struct hisi_thermal_sensor *sensor = _sensor;
 	struct hisi_thermal_data *data = sensor->thermal;

 	*temp = hisi_thermal_get_temperature(data->regs);

 	dev_dbg(&data->pdev->dev, "id=%d, temp=%d, thres=%d\n",
 		sensor->id, *temp, sensor->thres_temp);

 	return 0;
 }

 static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
 	.get_temp = hisi_thermal_get_temp,
 };

 static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
 {
 	struct hisi_thermal_data *data = dev;
 	struct hisi_thermal_sensor *sensor = &data->sensors;
 	int temp;

 	hisi_thermal_alarm_clear(data->regs, 1);

 	temp = hisi_thermal_get_temperature(data->regs);

 	if (temp >= sensor->thres_temp) {
 		dev_crit(&data->pdev->dev, "THERMAL ALARM: %d > %d\n",
 			 temp, sensor->thres_temp);

 		thermal_zone_device_update(data->sensors.tzd,
 					   THERMAL_EVENT_UNSPECIFIED);

 	} else if (temp < sensor->thres_temp) {
 		dev_crit(&data->pdev->dev, "THERMAL ALARM stopped: %d < %d\n",
 			 temp, sensor->thres_temp);
 	}

 	return IRQ_HANDLED;
 }

 static int hisi_thermal_register_sensor(struct platform_device *pdev,
 					struct hisi_thermal_data *data,
 					struct hisi_thermal_sensor *sensor,
 					int index)
 {
 	int ret, i;
 	const struct thermal_trip *trip;

 	sensor->id = index;
 	sensor->thermal = data;

 	sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
 				sensor->id, sensor, &hisi_of_thermal_ops);
 	if (IS_ERR(sensor->tzd)) {
 		ret = PTR_ERR(sensor->tzd);
 		sensor->tzd = NULL;
 		dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
 			sensor->id, ret);
 		return ret;
 	}

 	trip = of_thermal_get_trip_points(sensor->tzd);

 	for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
 		if (trip[i].type == THERMAL_TRIP_PASSIVE) {
 			sensor->thres_temp = hisi_thermal_round_temp(trip[i].temperature);
 			break;
 		}
 	}

 	return 0;
 }

 static const struct of_device_id of_hisi_thermal_match[] = {
 	{ .compatible = "hisilicon,tsensor" },
 	{ /* end */ }
 };
 MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);

 static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
 				       bool on)
 {
 	struct thermal_zone_device *tzd = sensor->tzd;

 	tzd->ops->set_mode(tzd,
 		on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
 }

 static int hisi_thermal_setup(struct hisi_thermal_data *data)
 {
 	struct hisi_thermal_sensor *sensor;

 	sensor = &data->sensors;

 	/* disable module firstly */
 	hisi_thermal_reset_enable(data->regs, 0);
 	hisi_thermal_enable(data->regs, 0);

 	/* select sensor id */
 	hisi_thermal_sensor_select(data->regs, sensor->id);

 	/* setting the hdak time */
 	hisi_thermal_hdak_set(data->regs, 0);

 	/* setting lag value between current temp and the threshold */
 	hisi_thermal_set_lag(data->regs, HISI_TEMP_LAG);

 	/* enable for interrupt */
 	hisi_thermal_alarm_set(data->regs, sensor->thres_temp);

 	hisi_thermal_reset_set(data->regs, HISI_TEMP_RESET);

 	/* enable module */
 	hisi_thermal_reset_enable(data->regs, 1);
 	hisi_thermal_enable(data->regs, 1);

 	hisi_thermal_alarm_clear(data->regs, 0);
 	hisi_thermal_alarm_enable(data->regs, 1);

 	return 0;
 }

 static int hisi_thermal_probe(struct platform_device *pdev)
 {
 	struct hisi_thermal_data *data;
 	struct resource *res;
 	int ret;

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

 	mutex_init(&data->thermal_lock);
 	data->pdev = pdev;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	data->regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(data->regs)) {
 		dev_err(&pdev->dev, "failed to get io address\n");
 		return PTR_ERR(data->regs);
 	}

 	data->irq = platform_get_irq(pdev, 0);
 	if (data->irq < 0)
 		return data->irq;

 	platform_set_drvdata(pdev, data);

 	data->clk = devm_clk_get(&pdev->dev, "thermal_clk");
 	if (IS_ERR(data->clk)) {
 		ret = PTR_ERR(data->clk);
 		if (ret != -EPROBE_DEFER)
 			dev_err(&pdev->dev,
 				"failed to get thermal clk: %d\n", ret);
 		return ret;
 	}

 	/* enable clock for thermal */
 	ret = clk_prepare_enable(data->clk);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
 		return ret;
 	}

 	ret = hisi_thermal_register_sensor(pdev, data,
 					   &data->sensors,
 					   HISI_DEFAULT_SENSOR);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register thermal sensor: %d\n",
 			ret);
 		return ret;
 	}

 	ret = hisi_thermal_setup(data);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to setup the sensor: %d\n", ret);
 		return ret;
 	}

 	ret = devm_request_threaded_irq(&pdev->dev, data->irq, NULL,
 					hisi_thermal_alarm_irq_thread,
 					IRQF_ONESHOT, "hisi_thermal", data);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
 		return ret;
 	}

 	hisi_thermal_toggle_sensor(&data->sensors, true);

 	return 0;
 }

 static int hisi_thermal_remove(struct platform_device *pdev)
 {
 	struct hisi_thermal_data *data = platform_get_drvdata(pdev);
 	struct hisi_thermal_sensor *sensor = &data->sensors;

 	hisi_thermal_toggle_sensor(sensor, false);
 	hisi_thermal_disable_sensor(data);
 	clk_disable_unprepare(data->clk);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int hisi_thermal_suspend(struct device *dev)
 {
 	struct hisi_thermal_data *data = dev_get_drvdata(dev);

 	hisi_thermal_disable_sensor(data);

 	clk_disable_unprepare(data->clk);

 	return 0;
 }

 static int hisi_thermal_resume(struct device *dev)
 {
 	struct hisi_thermal_data *data = dev_get_drvdata(dev);
 	int ret;

 	ret = clk_prepare_enable(data->clk);
 	if (ret)
 		return ret;

 	hisi_thermal_setup(data);

 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
 			 hisi_thermal_suspend, hisi_thermal_resume);

 static struct platform_driver hisi_thermal_driver = {
 	.driver = {
 		.name		= "hisi_thermal",
 		.pm		= &hisi_thermal_pm_ops,
 		.of_match_table = of_hisi_thermal_match,
 	},
 	.probe	= hisi_thermal_probe,
 	.remove	= hisi_thermal_remove,
 };

 module_platform_driver(hisi_thermal_driver);

 MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
 MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
 MODULE_DESCRIPTION("Hisilicon thermal driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Hisilicon thermal sensor driver
	*
	* Copyright (c) 2014-2015 Hisilicon Limited.
	* Copyright (c) 2014-2015 Linaro Limited.
	*
	* Xinwei Kong <kong.kongxinwei@hisilicon.com>
	* Leo Yan <leo.yan@linaro.org>
	*
	* 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.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	* kind, whether express or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/cpufreq.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/io.h>

	#include "thermal_core.h"

	#define TEMP0_LAG (0x0)
	#define TEMP0_TH (0x4)
	#define TEMP0_RST_TH (0x8)
	#define TEMP0_CFG (0xC)
	#define TEMP0_CFG_SS_MSK (0xF000)
	#define TEMP0_CFG_HDAK_MSK (0x30)
	#define TEMP0_EN (0x10)
	#define TEMP0_INT_EN (0x14)
	#define TEMP0_INT_CLR (0x18)
	#define TEMP0_RST_MSK (0x1C)
	#define TEMP0_VALUE (0x28)

	#define HISI_TEMP_BASE (-60000)
	#define HISI_TEMP_RESET (100000)
	#define HISI_TEMP_STEP (784)
	#define HISI_TEMP_LAG (3500)

	#define HISI_MAX_SENSORS 4
	#define HISI_DEFAULT_SENSOR 2

	struct hisi_thermal_sensor {
	struct hisi_thermal_data *thermal;
	struct thermal_zone_device *tzd;

	long sensor_temp;
	uint32_t id;
	uint32_t thres_temp;
	};

	struct hisi_thermal_data {
	struct mutex thermal_lock; /* protects register data */
	struct platform_device *pdev;
	struct clk *clk;
	struct hisi_thermal_sensor sensors;
	int irq;
	void __iomem *regs;
	};

	/*
	* The temperature computation on the tsensor is as follow:
	* Unit: millidegree Celsius
	* Step: 255/200 (0.7843)
	* Temperature base: -60°C
	*
	* The register is programmed in temperature steps, every step is 784
	* millidegree and begins at -60 000 m°C
	*
	* The temperature from the steps:
	*
	* Temp = TempBase + (steps x 784)
	*
	* and the steps from the temperature:
	*
	* steps = (Temp - TempBase) / 784
	*
	*/
	static inline int hisi_thermal_step_to_temp(int step)
	{
	return HISI_TEMP_BASE + (step * HISI_TEMP_STEP);
	}

	static inline long hisi_thermal_temp_to_step(long temp)
	{
	return (temp - HISI_TEMP_BASE) / HISI_TEMP_STEP;
	}

	static inline long hisi_thermal_round_temp(int temp)
	{
	return hisi_thermal_step_to_temp(
	hisi_thermal_temp_to_step(temp));
	}

	/*
	* The lag register contains 5 bits encoding the temperature in steps.
	*
	* Each time the temperature crosses the threshold boundary, an
	* interrupt is raised. It could be when the temperature is going
	* above the threshold or below. However, if the temperature is
	* fluctuating around this value due to the load, we can receive
	* several interrupts which may not desired.
	*
	* We can setup a temperature representing the delta between the
	* threshold and the current temperature when the temperature is
	* decreasing.
	*
	* For instance: the lag register is 5°C, the threshold is 65°C, when
	* the temperature reaches 65°C an interrupt is raised and when the
	* temperature decrease to 65°C - 5°C another interrupt is raised.
	*
	* A very short lag can lead to an interrupt storm, a long lag
	* increase the latency to react to the temperature changes. In our
	* case, that is not really a problem as we are polling the
	* temperature.
	*
	* [0:4] : lag register
	*
	* The temperature is coded in steps, cf. HISI_TEMP_STEP.
	*
	* Min : 0x00 : 0.0 °C
	* Max : 0x1F : 24.3 °C
	*
	* The 'value' parameter is in milliCelsius.
	*/
	static inline void hisi_thermal_set_lag(void __iomem *addr, int value)
	{
	writel((value / HISI_TEMP_STEP) & 0x1F, addr + TEMP0_LAG);
	}

	static inline void hisi_thermal_alarm_clear(void __iomem *addr, int value)
	{
	writel(value, addr + TEMP0_INT_CLR);
	}

	static inline void hisi_thermal_alarm_enable(void __iomem *addr, int value)
	{
	writel(value, addr + TEMP0_INT_EN);
	}

	static inline void hisi_thermal_alarm_set(void __iomem *addr, int temp)
	{
	writel(hisi_thermal_temp_to_step(temp) \| 0x0FFFFFF00, addr + TEMP0_TH);
	}

	static inline void hisi_thermal_reset_set(void __iomem *addr, int temp)
	{
	writel(hisi_thermal_temp_to_step(temp), addr + TEMP0_RST_TH);
	}

	static inline void hisi_thermal_reset_enable(void __iomem *addr, int value)
	{
	writel(value, addr + TEMP0_RST_MSK);
	}

	static inline void hisi_thermal_enable(void __iomem *addr, int value)
	{
	writel(value, addr + TEMP0_EN);
	}

	static inline int hisi_thermal_get_temperature(void __iomem *addr)
	{
	return hisi_thermal_step_to_temp(readl(addr + TEMP0_VALUE));
	}

	/*
	* Temperature configuration register - Sensor selection
	*
	* Bits [19:12]
	*
	* 0x0: local sensor (default)
	* 0x1: remote sensor 1 (ACPU cluster 1)
	* 0x2: remote sensor 2 (ACPU cluster 0)
	* 0x3: remote sensor 3 (G3D)
	*/
	static inline void hisi_thermal_sensor_select(void __iomem *addr, int sensor)
	{
	writel((readl(addr + TEMP0_CFG) & ~TEMP0_CFG_SS_MSK) \|
	(sensor << 12), addr + TEMP0_CFG);
	}

	/*
	* Temperature configuration register - Hdak conversion polling interval
	*
	* Bits [5:4]
	*
	* 0x0 : 0.768 ms
	* 0x1 : 6.144 ms
	* 0x2 : 49.152 ms
	* 0x3 : 393.216 ms
	*/
	static inline void hisi_thermal_hdak_set(void __iomem *addr, int value)
	{
	writel((readl(addr + TEMP0_CFG) & ~TEMP0_CFG_HDAK_MSK) \|
	(value << 4), addr + TEMP0_CFG);
	}

	static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data)
	{
	mutex_lock(&data->thermal_lock);

	/* disable sensor module */
	hisi_thermal_enable(data->regs, 0);
	hisi_thermal_alarm_enable(data->regs, 0);
	hisi_thermal_reset_enable(data->regs, 0);

	mutex_unlock(&data->thermal_lock);
	}

	static int hisi_thermal_get_temp(void _sensor, int temp)
	{
	struct hisi_thermal_sensor *sensor = _sensor;
	struct hisi_thermal_data *data = sensor->thermal;

	*temp = hisi_thermal_get_temperature(data->regs);

	dev_dbg(&data->pdev->dev, "id=%d, temp=%d, thres=%d\n",
	sensor->id, *temp, sensor->thres_temp);

	return 0;
	}

	static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
	.get_temp = hisi_thermal_get_temp,
	};

	static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
	{
	struct hisi_thermal_data *data = dev;
	struct hisi_thermal_sensor *sensor = &data->sensors;
	int temp;

	hisi_thermal_alarm_clear(data->regs, 1);

	temp = hisi_thermal_get_temperature(data->regs);

	if (temp >= sensor->thres_temp) {
	dev_crit(&data->pdev->dev, "THERMAL ALARM: %d > %d\n",
	temp, sensor->thres_temp);

	thermal_zone_device_update(data->sensors.tzd,
	THERMAL_EVENT_UNSPECIFIED);

	} else if (temp < sensor->thres_temp) {
	dev_crit(&data->pdev->dev, "THERMAL ALARM stopped: %d < %d\n",
	temp, sensor->thres_temp);
	}

	return IRQ_HANDLED;
	}

	static int hisi_thermal_register_sensor(struct platform_device *pdev,
	struct hisi_thermal_data *data,
	struct hisi_thermal_sensor *sensor,
	int index)
	{
	int ret, i;
	const struct thermal_trip *trip;

	sensor->id = index;
	sensor->thermal = data;

	sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
	sensor->id, sensor, &hisi_of_thermal_ops);
	if (IS_ERR(sensor->tzd)) {
	ret = PTR_ERR(sensor->tzd);
	sensor->tzd = NULL;
	dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
	sensor->id, ret);
	return ret;
	}

	trip = of_thermal_get_trip_points(sensor->tzd);

	for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
	if (trip[i].type == THERMAL_TRIP_PASSIVE) {
	sensor->thres_temp = hisi_thermal_round_temp(trip[i].temperature);
	break;
	}
	}

	return 0;
	}

	static const struct of_device_id of_hisi_thermal_match[] = {
	{ .compatible = "hisilicon,tsensor" },
	{ /* end */ }
	};
	MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);

	static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
	bool on)
	{
	struct thermal_zone_device *tzd = sensor->tzd;

	tzd->ops->set_mode(tzd,
	on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
	}

	static int hisi_thermal_setup(struct hisi_thermal_data *data)
	{
	struct hisi_thermal_sensor *sensor;

	sensor = &data->sensors;

	/* disable module firstly */
	hisi_thermal_reset_enable(data->regs, 0);
	hisi_thermal_enable(data->regs, 0);

	/* select sensor id */
	hisi_thermal_sensor_select(data->regs, sensor->id);

	/* setting the hdak time */
	hisi_thermal_hdak_set(data->regs, 0);

	/* setting lag value between current temp and the threshold */
	hisi_thermal_set_lag(data->regs, HISI_TEMP_LAG);

	/* enable for interrupt */
	hisi_thermal_alarm_set(data->regs, sensor->thres_temp);

	hisi_thermal_reset_set(data->regs, HISI_TEMP_RESET);

	/* enable module */
	hisi_thermal_reset_enable(data->regs, 1);
	hisi_thermal_enable(data->regs, 1);

	hisi_thermal_alarm_clear(data->regs, 0);
	hisi_thermal_alarm_enable(data->regs, 1);

	return 0;
	}

	static int hisi_thermal_probe(struct platform_device *pdev)
	{
	struct hisi_thermal_data *data;
	struct resource *res;
	int ret;

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

	mutex_init(&data->thermal_lock);
	data->pdev = pdev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	data->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(data->regs)) {
	dev_err(&pdev->dev, "failed to get io address\n");
	return PTR_ERR(data->regs);
	}

	data->irq = platform_get_irq(pdev, 0);
	if (data->irq < 0)
	return data->irq;

	platform_set_drvdata(pdev, data);

	data->clk = devm_clk_get(&pdev->dev, "thermal_clk");
	if (IS_ERR(data->clk)) {
	ret = PTR_ERR(data->clk);
	if (ret != -EPROBE_DEFER)
	dev_err(&pdev->dev,
	"failed to get thermal clk: %d\n", ret);
	return ret;
	}

	/* enable clock for thermal */
	ret = clk_prepare_enable(data->clk);
	if (ret) {
	dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
	return ret;
	}

	ret = hisi_thermal_register_sensor(pdev, data,
	&data->sensors,
	HISI_DEFAULT_SENSOR);
	if (ret) {
	dev_err(&pdev->dev, "failed to register thermal sensor: %d\n",
	ret);
	return ret;
	}

	ret = hisi_thermal_setup(data);
	if (ret) {
	dev_err(&pdev->dev, "Failed to setup the sensor: %d\n", ret);
	return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, data->irq, NULL,
	hisi_thermal_alarm_irq_thread,
	IRQF_ONESHOT, "hisi_thermal", data);
	if (ret < 0) {
	dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
	return ret;
	}

	hisi_thermal_toggle_sensor(&data->sensors, true);

	return 0;
	}

	static int hisi_thermal_remove(struct platform_device *pdev)
	{
	struct hisi_thermal_data *data = platform_get_drvdata(pdev);
	struct hisi_thermal_sensor *sensor = &data->sensors;

	hisi_thermal_toggle_sensor(sensor, false);
	hisi_thermal_disable_sensor(data);
	clk_disable_unprepare(data->clk);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int hisi_thermal_suspend(struct device *dev)
	{
	struct hisi_thermal_data *data = dev_get_drvdata(dev);

	hisi_thermal_disable_sensor(data);

	clk_disable_unprepare(data->clk);

	return 0;
	}

	static int hisi_thermal_resume(struct device *dev)
	{
	struct hisi_thermal_data *data = dev_get_drvdata(dev);
	int ret;

	ret = clk_prepare_enable(data->clk);
	if (ret)
	return ret;

	hisi_thermal_setup(data);

	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
	hisi_thermal_suspend, hisi_thermal_resume);

	static struct platform_driver hisi_thermal_driver = {
	.driver = {
	.name = "hisi_thermal",
	.pm = &hisi_thermal_pm_ops,
	.of_match_table = of_hisi_thermal_match,
	},
	.probe = hisi_thermal_probe,
	.remove = hisi_thermal_remove,
	};

	module_platform_driver(hisi_thermal_driver);

	MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
	MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
	MODULE_DESCRIPTION("Hisilicon thermal driver");
	MODULE_LICENSE("GPL v2");