[mirror_ubuntu-jammy-kernel.git] / drivers / thermal / hisi_thermal.c

/*
 * 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 HI6220_TEMP0_LAG			(0x0)
#define HI6220_TEMP0_TH				(0x4)
#define HI6220_TEMP0_RST_TH			(0x8)
#define HI6220_TEMP0_CFG			(0xC)
#define HI6220_TEMP0_CFG_SS_MSK		(0xF000)
#define HI6220_TEMP0_CFG_HDAK_MSK		(0x30)
#define HI6220_TEMP0_EN				(0x10)
#define HI6220_TEMP0_INT_EN			(0x14)
#define HI6220_TEMP0_INT_CLR			(0x18)
#define HI6220_TEMP0_RST_MSK			(0x1C)
#define HI6220_TEMP0_VALUE			(0x28)

#define HI6220_TEMP_BASE			(-60000)
#define HI6220_TEMP_RESET			(100000)
#define HI6220_TEMP_STEP			(785)
#define HI6220_TEMP_LAG			(3500)

#define HI6220_DEFAULT_SENSOR		2

struct hisi_thermal_sensor {
	struct thermal_zone_device *tzd;
	uint32_t id;
	uint32_t thres_temp;
};

struct hisi_thermal_data {
	struct platform_device *pdev;
	struct clk *clk;
	struct hisi_thermal_sensor sensor;
	void __iomem *regs;
	int irq;
};

/*
 * The temperature computation on the tsensor is as follow:
 *	Unit: millidegree Celsius
 *	Step: 200/255 (0.7843)
 *	Temperature base: -60°C
 *
 * The register is programmed in temperature steps, every step is 785
 * millidegree and begins at -60 000 m°C
 *
 * The temperature from the steps:
 *
 *	Temp = TempBase + (steps x 785)
 *
 * and the steps from the temperature:
 *
 *	steps = (Temp - TempBase) / 785
 *
 */
static inline int hi6220_thermal_step_to_temp(int step)
{
	return HI6220_TEMP_BASE + (step * HI6220_TEMP_STEP);
}

static inline int hi6220_thermal_temp_to_step(int temp)
{
	return DIV_ROUND_UP(temp - HI6220_TEMP_BASE, HI6220_TEMP_STEP);
}

/*
 * 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. HI6220_TEMP_STEP.
 *
 * Min : 0x00 :  0.0 °C
 * Max : 0x1F : 24.3 °C
 *
 * The 'value' parameter is in milliCelsius.
 */
static inline void hi6220_thermal_set_lag(void __iomem *addr, int value)
{
	writel(DIV_ROUND_UP(value, HI6220_TEMP_STEP) & 0x1F,
			addr + HI6220_TEMP0_LAG);
}

static inline void hi6220_thermal_alarm_clear(void __iomem *addr, int value)
{
	writel(value, addr + HI6220_TEMP0_INT_CLR);
}

static inline void hi6220_thermal_alarm_enable(void __iomem *addr, int value)
{
	writel(value, addr + HI6220_TEMP0_INT_EN);
}

static inline void hi6220_thermal_alarm_set(void __iomem *addr, int temp)
{
	writel(hi6220_thermal_temp_to_step(temp) | 0x0FFFFFF00,
	       addr + HI6220_TEMP0_TH);
}

static inline void hi6220_thermal_reset_set(void __iomem *addr, int temp)
{
	writel(hi6220_thermal_temp_to_step(temp), addr + HI6220_TEMP0_RST_TH);
}

static inline void hi6220_thermal_reset_enable(void __iomem *addr, int value)
{
	writel(value, addr + HI6220_TEMP0_RST_MSK);
}

static inline void hi6220_thermal_enable(void __iomem *addr, int value)
{
	writel(value, addr + HI6220_TEMP0_EN);
}

static inline int hi6220_thermal_get_temperature(void __iomem *addr)
{
	return hi6220_thermal_step_to_temp(readl(addr + HI6220_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 hi6220_thermal_sensor_select(void __iomem *addr, int sensor)
{
	writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_SS_MSK) |
	       (sensor << 12), addr + HI6220_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 hi6220_thermal_hdak_set(void __iomem *addr, int value)
{
	writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_HDAK_MSK) |
	       (value << 4), addr + HI6220_TEMP0_CFG);
}

static void hi6220_thermal_disable_sensor(struct hisi_thermal_data *data)
{
	/* disable sensor module */
	hi6220_thermal_enable(data->regs, 0);
	hi6220_thermal_alarm_enable(data->regs, 0);
	hi6220_thermal_reset_enable(data->regs, 0);

	clk_disable_unprepare(data->clk);
}

static int hi6220_thermal_enable_sensor(struct hisi_thermal_data *data)
{
	struct hisi_thermal_sensor *sensor = &data->sensor;
	int ret;

	/* enable clock for tsensor */
	ret = clk_prepare_enable(data->clk);
	if (ret)
		return ret;

	/* disable module firstly */
	hi6220_thermal_reset_enable(data->regs, 0);
	hi6220_thermal_enable(data->regs, 0);

	/* select sensor id */
	hi6220_thermal_sensor_select(data->regs, sensor->id);

	/* setting the hdak time */
	hi6220_thermal_hdak_set(data->regs, 0);

	/* setting lag value between current temp and the threshold */
	hi6220_thermal_set_lag(data->regs, HI6220_TEMP_LAG);

	/* enable for interrupt */
	hi6220_thermal_alarm_set(data->regs, sensor->thres_temp);

	hi6220_thermal_reset_set(data->regs, HI6220_TEMP_RESET);

	/* enable module */
	hi6220_thermal_reset_enable(data->regs, 1);
	hi6220_thermal_enable(data->regs, 1);

	hi6220_thermal_alarm_clear(data->regs, 0);
	hi6220_thermal_alarm_enable(data->regs, 1);

	return 0;
}

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

	*temp = hi6220_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->sensor;
	int temp = 0;

	hi6220_thermal_alarm_clear(data->regs, 1);

	hisi_thermal_get_temp(data, &temp);

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

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

	} else {
		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->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
							   sensor->id, data,
							   &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 = 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_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;

	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;
	}

	ret = hisi_thermal_register_sensor(pdev, data,
					   &data->sensor,
					   HI6220_DEFAULT_SENSOR);
	if (ret) {
		dev_err(&pdev->dev, "failed to register thermal sensor: %d\n",
			ret);
		return ret;
	}

	ret = hi6220_thermal_enable_sensor(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->sensor, 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->sensor;

	hisi_thermal_toggle_sensor(sensor, false);
	hi6220_thermal_disable_sensor(data);

	return 0;
}

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

	hi6220_thermal_disable_sensor(data);

	return 0;
}

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

	return hi6220_thermal_enable_sensor(data);
}
#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");
Commit	Line	Data
9a5238a9	1	/*
	2	* Hisilicon thermal sensor driver
	3	*
	4	* Copyright (c) 2014-2015 Hisilicon Limited.
	5	* Copyright (c) 2014-2015 Linaro Limited.
	6	*
	7	* Xinwei Kong <kong.kongxinwei@hisilicon.com>
	8	* Leo Yan <leo.yan@linaro.org>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	15	* kind, whether express or implied; without even the implied warranty
	16	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*/
	19
	20	#include <linux/cpufreq.h>
	21	#include <linux/delay.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/module.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/io.h>
	26
	27	#include "thermal_core.h"
	28
5ed82b79 KW	29	#define HI6220_TEMP0_LAG (0x0)
	30	#define HI6220_TEMP0_TH (0x4)
	31	#define HI6220_TEMP0_RST_TH (0x8)
	32	#define HI6220_TEMP0_CFG (0xC)
	33	#define HI6220_TEMP0_CFG_SS_MSK (0xF000)
	34	#define HI6220_TEMP0_CFG_HDAK_MSK (0x30)
	35	#define HI6220_TEMP0_EN (0x10)
	36	#define HI6220_TEMP0_INT_EN (0x14)
	37	#define HI6220_TEMP0_INT_CLR (0x18)
	38	#define HI6220_TEMP0_RST_MSK (0x1C)
	39	#define HI6220_TEMP0_VALUE (0x28)
	40
	41	#define HI6220_TEMP_BASE (-60000)
	42	#define HI6220_TEMP_RESET (100000)
	43	#define HI6220_TEMP_STEP (785)
	44	#define HI6220_TEMP_LAG (3500)
	45
	46	#define HI6220_DEFAULT_SENSOR 2
9a5238a9	47
9a5238a9	48	struct hisi_thermal_sensor {
9a5238a9	49	struct thermal_zone_device *tzd;
9a5238a9	50	uint32_t id;
	51	uint32_t thres_temp;
	52	};
	53
	54	struct hisi_thermal_data {
9a5238a9	55	struct platform_device *pdev;
9a5238a9	56	struct clk *clk;
609f26dc	57	struct hisi_thermal_sensor sensor;
9a5238a9	58	void __iomem *regs;
609f26dc	59	int irq;
9a5238a9	60	};
9a5238a9	61
48880b97 DL	62	/*
	63	* The temperature computation on the tsensor is as follow:
	64	* Unit: millidegree Celsius
e42bbe11	65	* Step: 200/255 (0.7843)
48880b97 DL	66	* Temperature base: -60°C
48880b97 DL	67	*
e42bbe11	68	* The register is programmed in temperature steps, every step is 785
48880b97 DL	69	* millidegree and begins at -60 000 m°C
	70	*
	71	* The temperature from the steps:
	72	*
e42bbe11	73	* Temp = TempBase + (steps x 785)
48880b97 DL	74	*
	75	* and the steps from the temperature:
	76	*
e42bbe11	77	* steps = (Temp - TempBase) / 785
48880b97 DL	78	*
48880b97 DL	79	*/
5ed82b79	80	static inline int hi6220_thermal_step_to_temp(int step)
9a5238a9	81	{
5ed82b79	82	return HI6220_TEMP_BASE + (step * HI6220_TEMP_STEP);
9a5238a9	83	}
9a5238a9	84
5ed82b79	85	static inline int hi6220_thermal_temp_to_step(int temp)
9a5238a9	86	{
5ed82b79	87	return DIV_ROUND_UP(temp - HI6220_TEMP_BASE, HI6220_TEMP_STEP);
db2b0332 DL	88	}
db2b0332 DL	89
10d7e9a9 DL	90	/*
	91	* The lag register contains 5 bits encoding the temperature in steps.
	92	*
	93	* Each time the temperature crosses the threshold boundary, an
	94	* interrupt is raised. It could be when the temperature is going
	95	* above the threshold or below. However, if the temperature is
	96	* fluctuating around this value due to the load, we can receive
	97	* several interrupts which may not desired.
	98	*
	99	* We can setup a temperature representing the delta between the
	100	* threshold and the current temperature when the temperature is
	101	* decreasing.
	102	*
	103	* For instance: the lag register is 5°C, the threshold is 65°C, when
	104	* the temperature reaches 65°C an interrupt is raised and when the
	105	* temperature decrease to 65°C - 5°C another interrupt is raised.
	106	*
	107	* A very short lag can lead to an interrupt storm, a long lag
	108	* increase the latency to react to the temperature changes. In our
	109	* case, that is not really a problem as we are polling the
	110	* temperature.
	111	*
	112	* [0:4] : lag register
	113	*
5ed82b79	114	* The temperature is coded in steps, cf. HI6220_TEMP_STEP.
10d7e9a9 DL	115	*
	116	* Min : 0x00 : 0.0 °C
	117	* Max : 0x1F : 24.3 °C
	118	*
	119	* The 'value' parameter is in milliCelsius.
	120	*/
5ed82b79	121	static inline void hi6220_thermal_set_lag(void __iomem *addr, int value)
1e11b014	122	{
5ed82b79 KW	123	writel(DIV_ROUND_UP(value, HI6220_TEMP_STEP) & 0x1F,
5ed82b79 KW	124	addr + HI6220_TEMP0_LAG);
1e11b014 DL	125	}
1e11b014 DL	126
5ed82b79	127	static inline void hi6220_thermal_alarm_clear(void __iomem *addr, int value)
1e11b014	128	{
5ed82b79	129	writel(value, addr + HI6220_TEMP0_INT_CLR);
1e11b014 DL	130	}
1e11b014 DL	131
5ed82b79	132	static inline void hi6220_thermal_alarm_enable(void __iomem *addr, int value)
1e11b014	133	{
5ed82b79	134	writel(value, addr + HI6220_TEMP0_INT_EN);
1e11b014 DL	135	}
1e11b014 DL	136
5ed82b79	137	static inline void hi6220_thermal_alarm_set(void __iomem *addr, int temp)
1e11b014	138	{
5ed82b79 KW	139	writel(hi6220_thermal_temp_to_step(temp) \| 0x0FFFFFF00,
5ed82b79 KW	140	addr + HI6220_TEMP0_TH);
1e11b014 DL	141	}
1e11b014 DL	142
5ed82b79	143	static inline void hi6220_thermal_reset_set(void __iomem *addr, int temp)
1e11b014	144	{
5ed82b79	145	writel(hi6220_thermal_temp_to_step(temp), addr + HI6220_TEMP0_RST_TH);
1e11b014 DL	146	}
1e11b014 DL	147
5ed82b79	148	static inline void hi6220_thermal_reset_enable(void __iomem *addr, int value)
1e11b014	149	{
5ed82b79	150	writel(value, addr + HI6220_TEMP0_RST_MSK);
1e11b014 DL	151	}
1e11b014 DL	152
5ed82b79	153	static inline void hi6220_thermal_enable(void __iomem *addr, int value)
1e11b014	154	{
5ed82b79	155	writel(value, addr + HI6220_TEMP0_EN);
1e11b014 DL	156	}
1e11b014 DL	157
5ed82b79	158	static inline int hi6220_thermal_get_temperature(void __iomem *addr)
1e11b014	159	{
5ed82b79	160	return hi6220_thermal_step_to_temp(readl(addr + HI6220_TEMP0_VALUE));
1e11b014 DL	161	}
1e11b014 DL	162
b424315a DL	163	/*
	164	* Temperature configuration register - Sensor selection
	165	*
	166	* Bits [19:12]
	167	*
	168	* 0x0: local sensor (default)
	169	* 0x1: remote sensor 1 (ACPU cluster 1)
	170	* 0x2: remote sensor 2 (ACPU cluster 0)
	171	* 0x3: remote sensor 3 (G3D)
	172	*/
5ed82b79	173	static inline void hi6220_thermal_sensor_select(void __iomem *addr, int sensor)
1e11b014	174	{
5ed82b79 KW	175	writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_SS_MSK) \|
5ed82b79 KW	176	(sensor << 12), addr + HI6220_TEMP0_CFG);
1e11b014 DL	177	}
1e11b014 DL	178
b424315a DL	179	/*
	180	* Temperature configuration register - Hdak conversion polling interval
	181	*
	182	* Bits [5:4]
	183	*
	184	* 0x0 : 0.768 ms
	185	* 0x1 : 6.144 ms
	186	* 0x2 : 49.152 ms
	187	* 0x3 : 393.216 ms
	188	*/
5ed82b79	189	static inline void hi6220_thermal_hdak_set(void __iomem *addr, int value)
1e11b014	190	{
5ed82b79 KW	191	writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_HDAK_MSK) \|
5ed82b79 KW	192	(value << 4), addr + HI6220_TEMP0_CFG);
1e11b014 DL	193	}
1e11b014 DL	194
5ed82b79	195	static void hi6220_thermal_disable_sensor(struct hisi_thermal_data *data)
9a5238a9	196	{
9a5238a9	197	/* disable sensor module */
5ed82b79 KW	198	hi6220_thermal_enable(data->regs, 0);
	199	hi6220_thermal_alarm_enable(data->regs, 0);
	200	hi6220_thermal_reset_enable(data->regs, 0);
943c0f6a KW	201
943c0f6a KW	202	clk_disable_unprepare(data->clk);
9a5238a9	203	}
9a5238a9	204
5ed82b79	205	static int hi6220_thermal_enable_sensor(struct hisi_thermal_data *data)
a0678da8 KW	206	{
	207	struct hisi_thermal_sensor *sensor = &data->sensor;
	208	int ret;
	209
	210	/* enable clock for tsensor */
	211	ret = clk_prepare_enable(data->clk);
	212	if (ret)
	213	return ret;
	214
	215	/* disable module firstly */
5ed82b79 KW	216	hi6220_thermal_reset_enable(data->regs, 0);
5ed82b79 KW	217	hi6220_thermal_enable(data->regs, 0);
a0678da8 KW	218
a0678da8 KW	219	/* select sensor id */
5ed82b79	220	hi6220_thermal_sensor_select(data->regs, sensor->id);
a0678da8 KW	221
a0678da8 KW	222	/* setting the hdak time */
5ed82b79	223	hi6220_thermal_hdak_set(data->regs, 0);
a0678da8 KW	224
a0678da8 KW	225	/* setting lag value between current temp and the threshold */
5ed82b79	226	hi6220_thermal_set_lag(data->regs, HI6220_TEMP_LAG);
a0678da8 KW	227
a0678da8 KW	228	/* enable for interrupt */
5ed82b79	229	hi6220_thermal_alarm_set(data->regs, sensor->thres_temp);
a0678da8	230
5ed82b79	231	hi6220_thermal_reset_set(data->regs, HI6220_TEMP_RESET);
a0678da8 KW	232
a0678da8 KW	233	/* enable module */
5ed82b79 KW	234	hi6220_thermal_reset_enable(data->regs, 1);
5ed82b79 KW	235	hi6220_thermal_enable(data->regs, 1);
a0678da8	236
5ed82b79 KW	237	hi6220_thermal_alarm_clear(data->regs, 0);
5ed82b79 KW	238	hi6220_thermal_alarm_enable(data->regs, 1);
a0678da8 KW	239
	240	return 0;
	241	}
	242
81d7cb79	243	static int hisi_thermal_get_temp(void __data, int temp)
9a5238a9	244	{
81d7cb79 DL	245	struct hisi_thermal_data *data = __data;
81d7cb79 DL	246	struct hisi_thermal_sensor *sensor = &data->sensor;
9a5238a9	247
5ed82b79	248	*temp = hi6220_thermal_get_temperature(data->regs);
9a5238a9	249
10d7e9a9 DL	250	dev_dbg(&data->pdev->dev, "id=%d, temp=%d, thres=%d\n",
10d7e9a9 DL	251	sensor->id, *temp, sensor->thres_temp);
9a5238a9	252
	253	return 0;
	254	}
	255
3fe156f1	256	static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
9a5238a9	257	.get_temp = hisi_thermal_get_temp,
	258	};
	259
10d7e9a9	260	static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
9a5238a9	261	{
9a5238a9	262	struct hisi_thermal_data *data = dev;
609f26dc	263	struct hisi_thermal_sensor *sensor = &data->sensor;
5ed82b79	264	int temp = 0;
9a5238a9	265
5ed82b79	266	hi6220_thermal_alarm_clear(data->regs, 1);
9a5238a9	267
5ed82b79	268	hisi_thermal_get_temp(data, &temp);
9a5238a9	269
10d7e9a9 DL	270	if (temp >= sensor->thres_temp) {
	271	dev_crit(&data->pdev->dev, "THERMAL ALARM: %d > %d\n",
	272	temp, sensor->thres_temp);
9a5238a9	273
609f26dc	274	thermal_zone_device_update(data->sensor.tzd,
10d7e9a9	275	THERMAL_EVENT_UNSPECIFIED);
9a5238a9	276
5ed82b79	277	} else {
10d7e9a9 DL	278	dev_crit(&data->pdev->dev, "THERMAL ALARM stopped: %d < %d\n",
	279	temp, sensor->thres_temp);
	280	}
9a5238a9	281
	282	return IRQ_HANDLED;
	283	}
	284
	285	static int hisi_thermal_register_sensor(struct platform_device *pdev,
	286	struct hisi_thermal_data *data,
	287	struct hisi_thermal_sensor *sensor,
	288	int index)
	289	{
	290	int ret, i;
	291	const struct thermal_trip *trip;
	292
	293	sensor->id = index;
9a5238a9	294
44a520d8	295	sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
81d7cb79 DL	296	sensor->id, data,
81d7cb79 DL	297	&hisi_of_thermal_ops);
9a5238a9	298	if (IS_ERR(sensor->tzd)) {
9a5238a9	299	ret = PTR_ERR(sensor->tzd);
439dc968	300	sensor->tzd = NULL;
9a5238a9	301	dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
	302	sensor->id, ret);
	303	return ret;
	304	}
	305
	306	trip = of_thermal_get_trip_points(sensor->tzd);
	307
	308	for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
	309	if (trip[i].type == THERMAL_TRIP_PASSIVE) {
e42bbe11	310	sensor->thres_temp = trip[i].temperature;
9a5238a9	311	break;
	312	}
	313	}
	314
	315	return 0;
	316	}
	317
	318	static const struct of_device_id of_hisi_thermal_match[] = {
	319	{ .compatible = "hisilicon,tsensor" },
	320	{ /* end */ }
	321	};
	322	MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);
	323
	324	static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
	325	bool on)
	326	{
	327	struct thermal_zone_device *tzd = sensor->tzd;
	328
	329	tzd->ops->set_mode(tzd,
	330	on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
	331	}
	332
	333	static int hisi_thermal_probe(struct platform_device *pdev)
	334	{
	335	struct hisi_thermal_data *data;
	336	struct resource *res;
9a5238a9	337	int ret;
	338
	339	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	340	if (!data)
	341	return -ENOMEM;
	342
9a5238a9	343	data->pdev = pdev;
	344
	345	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	346	data->regs = devm_ioremap_resource(&pdev->dev, res);
	347	if (IS_ERR(data->regs)) {
	348	dev_err(&pdev->dev, "failed to get io address\n");
	349	return PTR_ERR(data->regs);
	350	}
	351
	352	data->irq = platform_get_irq(pdev, 0);
	353	if (data->irq < 0)
	354	return data->irq;
	355
9a5238a9	356	platform_set_drvdata(pdev, data);
	357
	358	data->clk = devm_clk_get(&pdev->dev, "thermal_clk");
	359	if (IS_ERR(data->clk)) {
	360	ret = PTR_ERR(data->clk);
	361	if (ret != -EPROBE_DEFER)
	362	dev_err(&pdev->dev,
	363	"failed to get thermal clk: %d\n", ret);
	364	return ret;
	365	}
	366
ff4ec299	367	ret = hisi_thermal_register_sensor(pdev, data,
609f26dc	368	&data->sensor,
5ed82b79	369	HI6220_DEFAULT_SENSOR);
ff4ec299 DL	370	if (ret) {
	371	dev_err(&pdev->dev, "failed to register thermal sensor: %d\n",
	372	ret);
	373	return ret;
9a5238a9	374	}
9a5238a9	375
5ed82b79	376	ret = hi6220_thermal_enable_sensor(data);
10d7e9a9 DL	377	if (ret) {
	378	dev_err(&pdev->dev, "Failed to setup the sensor: %d\n", ret);
	379	return ret;
	380	}
ff4ec299	381
10d7e9a9	382	ret = devm_request_threaded_irq(&pdev->dev, data->irq, NULL,
2cb4de78	383	hisi_thermal_alarm_irq_thread,
10d7e9a9	384	IRQF_ONESHOT, "hisi_thermal", data);
2cb4de78 DL	385	if (ret < 0) {
	386	dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
	387	return ret;
	388	}
	389
609f26dc	390	hisi_thermal_toggle_sensor(&data->sensor, true);
c176b10b	391
9a5238a9	392	return 0;
9a5238a9	393	}
	394
	395	static int hisi_thermal_remove(struct platform_device *pdev)
	396	{
	397	struct hisi_thermal_data *data = platform_get_drvdata(pdev);
609f26dc	398	struct hisi_thermal_sensor *sensor = &data->sensor;
9a5238a9	399
ff4ec299	400	hisi_thermal_toggle_sensor(sensor, false);
5ed82b79	401	hi6220_thermal_disable_sensor(data);
9a5238a9	402
	403	return 0;
	404	}
	405
	406	#ifdef CONFIG_PM_SLEEP
	407	static int hisi_thermal_suspend(struct device *dev)
	408	{
	409	struct hisi_thermal_data *data = dev_get_drvdata(dev);
	410
5ed82b79	411	hi6220_thermal_disable_sensor(data);
9a5238a9	412
9a5238a9	413	return 0;
	414	}
	415
	416	static int hisi_thermal_resume(struct device *dev)
	417	{
	418	struct hisi_thermal_data *data = dev_get_drvdata(dev);
	419
5ed82b79	420	return hi6220_thermal_enable_sensor(data);
9a5238a9	421	}
	422	#endif
	423
	424	static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
	425	hisi_thermal_suspend, hisi_thermal_resume);
	426
	427	static struct platform_driver hisi_thermal_driver = {
	428	.driver = {
	429	.name = "hisi_thermal",
9a5238a9	430	.pm = &hisi_thermal_pm_ops,
	431	.of_match_table = of_hisi_thermal_match,
	432	},
	433	.probe = hisi_thermal_probe,
	434	.remove = hisi_thermal_remove,
	435	};
	436
	437	module_platform_driver(hisi_thermal_driver);
	438
	439	MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
	440	MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
	441	MODULE_DESCRIPTION("Hisilicon thermal driver");
	442	MODULE_LICENSE("GPL v2");