[mirror_ubuntu-hirsute-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 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			(785)
#define HISI_TEMP_LAG			(3500)

#define HISI_MAX_SENSORS		4
#define HISI_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 hisi_thermal_step_to_temp(int step)
{
	return HISI_TEMP_BASE + (step * HISI_TEMP_STEP);
}

static inline int hisi_thermal_temp_to_step(int temp)
{
	return DIV_ROUND_UP(temp - HISI_TEMP_BASE, HISI_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. 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(DIV_ROUND_UP(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)
{
	/* disable sensor module */
	hisi_thermal_enable(data->regs, 0);
	hisi_thermal_alarm_enable(data->regs, 0);
	hisi_thermal_reset_enable(data->regs, 0);

	clk_disable_unprepare(data->clk);
}

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

	*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->sensor;
	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->sensor.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->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_setup(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 */
	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;

	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,
					   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->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);
	hisi_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);

	hisi_thermal_disable_sensor(data);

	return 0;
}

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

	return hisi_thermal_setup(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
1e11b014	29	#define TEMP0_LAG (0x0)
9a5238a9	30	#define TEMP0_TH (0x4)
	31	#define TEMP0_RST_TH (0x8)
	32	#define TEMP0_CFG (0xC)
b424315a DL	33	#define TEMP0_CFG_SS_MSK (0xF000)
b424315a DL	34	#define TEMP0_CFG_HDAK_MSK (0x30)
9a5238a9	35	#define TEMP0_EN (0x10)
	36	#define TEMP0_INT_EN (0x14)
	37	#define TEMP0_INT_CLR (0x18)
	38	#define TEMP0_RST_MSK (0x1C)
	39	#define TEMP0_VALUE (0x28)
	40
48880b97	41	#define HISI_TEMP_BASE (-60000)
9a5238a9	42	#define HISI_TEMP_RESET (100000)
e42bbe11	43	#define HISI_TEMP_STEP (785)
10d7e9a9	44	#define HISI_TEMP_LAG (3500)
9a5238a9	45
9a5238a9	46	#define HISI_MAX_SENSORS 4
ff4ec299	47	#define HISI_DEFAULT_SENSOR 2
9a5238a9	48
9a5238a9	49	struct hisi_thermal_sensor {
9a5238a9	50	struct thermal_zone_device *tzd;
9a5238a9	51	uint32_t id;
	52	uint32_t thres_temp;
	53	};
	54
	55	struct hisi_thermal_data {
9a5238a9	56	struct platform_device *pdev;
9a5238a9	57	struct clk *clk;
609f26dc	58	struct hisi_thermal_sensor sensor;
9a5238a9	59	void __iomem *regs;
609f26dc	60	int irq;
9a5238a9	61	};
9a5238a9	62
48880b97 DL	63	/*
	64	* The temperature computation on the tsensor is as follow:
	65	* Unit: millidegree Celsius
e42bbe11	66	* Step: 200/255 (0.7843)
48880b97 DL	67	* Temperature base: -60°C
48880b97 DL	68	*
e42bbe11	69	* The register is programmed in temperature steps, every step is 785
48880b97 DL	70	* millidegree and begins at -60 000 m°C
	71	*
	72	* The temperature from the steps:
	73	*
e42bbe11	74	* Temp = TempBase + (steps x 785)
48880b97 DL	75	*
	76	* and the steps from the temperature:
	77	*
e42bbe11	78	* steps = (Temp - TempBase) / 785
48880b97 DL	79	*
	80	*/
	81	static inline int hisi_thermal_step_to_temp(int step)
9a5238a9	82	{
48880b97	83	return HISI_TEMP_BASE + (step * HISI_TEMP_STEP);
9a5238a9	84	}
9a5238a9	85
bc02ef6d	86	static inline int hisi_thermal_temp_to_step(int temp)
9a5238a9	87	{
e42bbe11	88	return DIV_ROUND_UP(temp - HISI_TEMP_BASE, HISI_TEMP_STEP);
db2b0332 DL	89	}
db2b0332 DL	90
10d7e9a9 DL	91	/*
	92	* The lag register contains 5 bits encoding the temperature in steps.
	93	*
	94	* Each time the temperature crosses the threshold boundary, an
	95	* interrupt is raised. It could be when the temperature is going
	96	* above the threshold or below. However, if the temperature is
	97	* fluctuating around this value due to the load, we can receive
	98	* several interrupts which may not desired.
	99	*
	100	* We can setup a temperature representing the delta between the
	101	* threshold and the current temperature when the temperature is
	102	* decreasing.
	103	*
	104	* For instance: the lag register is 5°C, the threshold is 65°C, when
	105	* the temperature reaches 65°C an interrupt is raised and when the
	106	* temperature decrease to 65°C - 5°C another interrupt is raised.
	107	*
	108	* A very short lag can lead to an interrupt storm, a long lag
	109	* increase the latency to react to the temperature changes. In our
	110	* case, that is not really a problem as we are polling the
	111	* temperature.
	112	*
	113	* [0:4] : lag register
	114	*
	115	* The temperature is coded in steps, cf. HISI_TEMP_STEP.
	116	*
	117	* Min : 0x00 : 0.0 °C
	118	* Max : 0x1F : 24.3 °C
	119	*
	120	* The 'value' parameter is in milliCelsius.
	121	*/
1e11b014 DL	122	static inline void hisi_thermal_set_lag(void __iomem *addr, int value)
1e11b014 DL	123	{
e42bbe11	124	writel(DIV_ROUND_UP(value, HISI_TEMP_STEP) & 0x1F, addr + TEMP0_LAG);
1e11b014 DL	125	}
	126
	127	static inline void hisi_thermal_alarm_clear(void __iomem *addr, int value)
	128	{
	129	writel(value, addr + TEMP0_INT_CLR);
	130	}
	131
	132	static inline void hisi_thermal_alarm_enable(void __iomem *addr, int value)
	133	{
	134	writel(value, addr + TEMP0_INT_EN);
	135	}
	136
	137	static inline void hisi_thermal_alarm_set(void __iomem *addr, int temp)
	138	{
	139	writel(hisi_thermal_temp_to_step(temp) \| 0x0FFFFFF00, addr + TEMP0_TH);
	140	}
	141
	142	static inline void hisi_thermal_reset_set(void __iomem *addr, int temp)
	143	{
	144	writel(hisi_thermal_temp_to_step(temp), addr + TEMP0_RST_TH);
	145	}
	146
	147	static inline void hisi_thermal_reset_enable(void __iomem *addr, int value)
	148	{
	149	writel(value, addr + TEMP0_RST_MSK);
	150	}
	151
	152	static inline void hisi_thermal_enable(void __iomem *addr, int value)
	153	{
	154	writel(value, addr + TEMP0_EN);
	155	}
	156
b424315a	157	static inline int hisi_thermal_get_temperature(void __iomem *addr)
1e11b014	158	{
b424315a	159	return hisi_thermal_step_to_temp(readl(addr + TEMP0_VALUE));
1e11b014 DL	160	}
1e11b014 DL	161
b424315a DL	162	/*
	163	* Temperature configuration register - Sensor selection
	164	*
	165	* Bits [19:12]
	166	*
	167	* 0x0: local sensor (default)
	168	* 0x1: remote sensor 1 (ACPU cluster 1)
	169	* 0x2: remote sensor 2 (ACPU cluster 0)
	170	* 0x3: remote sensor 3 (G3D)
	171	*/
	172	static inline void hisi_thermal_sensor_select(void __iomem *addr, int sensor)
1e11b014	173	{
b424315a DL	174	writel((readl(addr + TEMP0_CFG) & ~TEMP0_CFG_SS_MSK) \|
b424315a DL	175	(sensor << 12), addr + TEMP0_CFG);
1e11b014 DL	176	}
1e11b014 DL	177
b424315a DL	178	/*
	179	* Temperature configuration register - Hdak conversion polling interval
	180	*
	181	* Bits [5:4]
	182	*
	183	* 0x0 : 0.768 ms
	184	* 0x1 : 6.144 ms
	185	* 0x2 : 49.152 ms
	186	* 0x3 : 393.216 ms
	187	*/
1e11b014 DL	188	static inline void hisi_thermal_hdak_set(void __iomem *addr, int value)
1e11b014 DL	189	{
b424315a DL	190	writel((readl(addr + TEMP0_CFG) & ~TEMP0_CFG_HDAK_MSK) \|
b424315a DL	191	(value << 4), addr + TEMP0_CFG);
1e11b014 DL	192	}
1e11b014 DL	193
9a5238a9	194	static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data)
9a5238a9	195	{
9a5238a9	196	/* disable sensor module */
1e11b014 DL	197	hisi_thermal_enable(data->regs, 0);
	198	hisi_thermal_alarm_enable(data->regs, 0);
	199	hisi_thermal_reset_enable(data->regs, 0);
943c0f6a KW	200
943c0f6a KW	201	clk_disable_unprepare(data->clk);
9a5238a9	202	}
9a5238a9	203
81d7cb79	204	static int hisi_thermal_get_temp(void __data, int temp)
9a5238a9	205	{
81d7cb79 DL	206	struct hisi_thermal_data *data = __data;
81d7cb79 DL	207	struct hisi_thermal_sensor *sensor = &data->sensor;
9a5238a9	208
10d7e9a9	209	*temp = hisi_thermal_get_temperature(data->regs);
9a5238a9	210
10d7e9a9 DL	211	dev_dbg(&data->pdev->dev, "id=%d, temp=%d, thres=%d\n",
10d7e9a9 DL	212	sensor->id, *temp, sensor->thres_temp);
9a5238a9	213
	214	return 0;
	215	}
	216
3fe156f1	217	static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
9a5238a9	218	.get_temp = hisi_thermal_get_temp,
	219	};
	220
10d7e9a9	221	static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
9a5238a9	222	{
9a5238a9	223	struct hisi_thermal_data *data = dev;
609f26dc	224	struct hisi_thermal_sensor *sensor = &data->sensor;
10d7e9a9	225	int temp;
9a5238a9	226
10d7e9a9	227	hisi_thermal_alarm_clear(data->regs, 1);
9a5238a9	228
10d7e9a9	229	temp = hisi_thermal_get_temperature(data->regs);
9a5238a9	230
10d7e9a9 DL	231	if (temp >= sensor->thres_temp) {
	232	dev_crit(&data->pdev->dev, "THERMAL ALARM: %d > %d\n",
	233	temp, sensor->thres_temp);
9a5238a9	234
609f26dc	235	thermal_zone_device_update(data->sensor.tzd,
10d7e9a9	236	THERMAL_EVENT_UNSPECIFIED);
9a5238a9	237
10d7e9a9 DL	238	} else if (temp < sensor->thres_temp) {
	239	dev_crit(&data->pdev->dev, "THERMAL ALARM stopped: %d < %d\n",
	240	temp, sensor->thres_temp);
	241	}
9a5238a9	242
	243	return IRQ_HANDLED;
	244	}
	245
	246	static int hisi_thermal_register_sensor(struct platform_device *pdev,
	247	struct hisi_thermal_data *data,
	248	struct hisi_thermal_sensor *sensor,
	249	int index)
	250	{
	251	int ret, i;
	252	const struct thermal_trip *trip;
	253
	254	sensor->id = index;
9a5238a9	255
44a520d8	256	sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
81d7cb79 DL	257	sensor->id, data,
81d7cb79 DL	258	&hisi_of_thermal_ops);
9a5238a9	259	if (IS_ERR(sensor->tzd)) {
9a5238a9	260	ret = PTR_ERR(sensor->tzd);
439dc968	261	sensor->tzd = NULL;
9a5238a9	262	dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
	263	sensor->id, ret);
	264	return ret;
	265	}
	266
	267	trip = of_thermal_get_trip_points(sensor->tzd);
	268
	269	for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
	270	if (trip[i].type == THERMAL_TRIP_PASSIVE) {
e42bbe11	271	sensor->thres_temp = trip[i].temperature;
9a5238a9	272	break;
	273	}
	274	}
	275
	276	return 0;
	277	}
	278
	279	static const struct of_device_id of_hisi_thermal_match[] = {
	280	{ .compatible = "hisilicon,tsensor" },
	281	{ /* end */ }
	282	};
	283	MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);
	284
	285	static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
	286	bool on)
	287	{
	288	struct thermal_zone_device *tzd = sensor->tzd;
	289
	290	tzd->ops->set_mode(tzd,
	291	on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
	292	}
	293
10d7e9a9 DL	294	static int hisi_thermal_setup(struct hisi_thermal_data *data)
10d7e9a9 DL	295	{
943c0f6a KW	296	struct hisi_thermal_sensor *sensor = &data->sensor;
943c0f6a KW	297	int ret;
10d7e9a9	298
943c0f6a KW	299	/* enable clock for tsensor */
	300	ret = clk_prepare_enable(data->clk);
	301	if (ret)
	302	return ret;
10d7e9a9 DL	303
	304	/* disable module firstly */
	305	hisi_thermal_reset_enable(data->regs, 0);
	306	hisi_thermal_enable(data->regs, 0);
	307
	308	/* select sensor id */
	309	hisi_thermal_sensor_select(data->regs, sensor->id);
	310
	311	/* setting the hdak time */
	312	hisi_thermal_hdak_set(data->regs, 0);
	313
	314	/* setting lag value between current temp and the threshold */
	315	hisi_thermal_set_lag(data->regs, HISI_TEMP_LAG);
	316
	317	/* enable for interrupt */
	318	hisi_thermal_alarm_set(data->regs, sensor->thres_temp);
	319
	320	hisi_thermal_reset_set(data->regs, HISI_TEMP_RESET);
	321
	322	/* enable module */
	323	hisi_thermal_reset_enable(data->regs, 1);
	324	hisi_thermal_enable(data->regs, 1);
	325
	326	hisi_thermal_alarm_clear(data->regs, 0);
	327	hisi_thermal_alarm_enable(data->regs, 1);
	328
	329	return 0;
	330	}
	331
9a5238a9	332	static int hisi_thermal_probe(struct platform_device *pdev)
	333	{
	334	struct hisi_thermal_data *data;
	335	struct resource *res;
9a5238a9	336	int ret;
	337
	338	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	339	if (!data)
	340	return -ENOMEM;
	341
9a5238a9	342	data->pdev = pdev;
	343
	344	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	345	data->regs = devm_ioremap_resource(&pdev->dev, res);
	346	if (IS_ERR(data->regs)) {
	347	dev_err(&pdev->dev, "failed to get io address\n");
	348	return PTR_ERR(data->regs);
	349	}
	350
	351	data->irq = platform_get_irq(pdev, 0);
	352	if (data->irq < 0)
	353	return data->irq;
	354
9a5238a9	355	platform_set_drvdata(pdev, data);
	356
	357	data->clk = devm_clk_get(&pdev->dev, "thermal_clk");
	358	if (IS_ERR(data->clk)) {
	359	ret = PTR_ERR(data->clk);
	360	if (ret != -EPROBE_DEFER)
	361	dev_err(&pdev->dev,
	362	"failed to get thermal clk: %d\n", ret);
	363	return ret;
	364	}
	365
ff4ec299	366	ret = hisi_thermal_register_sensor(pdev, data,
609f26dc	367	&data->sensor,
ff4ec299 DL	368	HISI_DEFAULT_SENSOR);
	369	if (ret) {
	370	dev_err(&pdev->dev, "failed to register thermal sensor: %d\n",
	371	ret);
	372	return ret;
9a5238a9	373	}
9a5238a9	374
10d7e9a9 DL	375	ret = hisi_thermal_setup(data);
	376	if (ret) {
	377	dev_err(&pdev->dev, "Failed to setup the sensor: %d\n", ret);
	378	return ret;
	379	}
ff4ec299	380
10d7e9a9	381	ret = devm_request_threaded_irq(&pdev->dev, data->irq, NULL,
2cb4de78	382	hisi_thermal_alarm_irq_thread,
10d7e9a9	383	IRQF_ONESHOT, "hisi_thermal", data);
2cb4de78 DL	384	if (ret < 0) {
	385	dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
	386	return ret;
	387	}
	388
609f26dc	389	hisi_thermal_toggle_sensor(&data->sensor, true);
c176b10b	390
9a5238a9	391	return 0;
9a5238a9	392	}
	393
	394	static int hisi_thermal_remove(struct platform_device *pdev)
	395	{
	396	struct hisi_thermal_data *data = platform_get_drvdata(pdev);
609f26dc	397	struct hisi_thermal_sensor *sensor = &data->sensor;
9a5238a9	398
ff4ec299	399	hisi_thermal_toggle_sensor(sensor, false);
9a5238a9	400	hisi_thermal_disable_sensor(data);
9a5238a9	401
	402	return 0;
	403	}
	404
	405	#ifdef CONFIG_PM_SLEEP
	406	static int hisi_thermal_suspend(struct device *dev)
	407	{
	408	struct hisi_thermal_data *data = dev_get_drvdata(dev);
	409
	410	hisi_thermal_disable_sensor(data);
9a5238a9	411
9a5238a9	412	return 0;
	413	}
	414
	415	static int hisi_thermal_resume(struct device *dev)
	416	{
	417	struct hisi_thermal_data *data = dev_get_drvdata(dev);
	418
943c0f6a	419	return hisi_thermal_setup(data);
9a5238a9	420	}
	421	#endif
	422
	423	static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
	424	hisi_thermal_suspend, hisi_thermal_resume);
	425
	426	static struct platform_driver hisi_thermal_driver = {
	427	.driver = {
	428	.name = "hisi_thermal",
9a5238a9	429	.pm = &hisi_thermal_pm_ops,
	430	.of_match_table = of_hisi_thermal_match,
	431	},
	432	.probe = hisi_thermal_probe,
	433	.remove = hisi_thermal_remove,
	434	};
	435
	436	module_platform_driver(hisi_thermal_driver);
	437
	438	MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
	439	MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
	440	MODULE_DESCRIPTION("Hisilicon thermal driver");
	441	MODULE_LICENSE("GPL v2");