[linux-block.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 <linux/of_device.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 {
	int (*get_temp)(struct hisi_thermal_data *data);
	int (*enable_sensor)(struct hisi_thermal_data *data);
	int (*disable_sensor)(struct hisi_thermal_data *data);
	int (*irq_handler)(struct hisi_thermal_data *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 int hi6220_thermal_irq_handler(struct hisi_thermal_data *data)
{
	hi6220_thermal_alarm_clear(data->regs, 1);
	return 0;
}

static int hi6220_thermal_get_temp(struct hisi_thermal_data *data)
{
	return hi6220_thermal_get_temperature(data->regs);
}

static int 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);

	return 0;
}

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 hi6220_thermal_probe(struct hisi_thermal_data *data)
{
	struct platform_device *pdev = data->pdev;
	struct device *dev = &pdev->dev;
	struct resource *res;
	int ret;

	data->get_temp = hi6220_thermal_get_temp;
	data->enable_sensor = hi6220_thermal_enable_sensor;
	data->disable_sensor = hi6220_thermal_disable_sensor;
	data->irq_handler = hi6220_thermal_irq_handler;

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

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

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

	data->sensor.id = HI6220_DEFAULT_SENSOR;

	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 = data->get_temp(data);

	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;

	data->irq_handler(data);

	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 ret, i;
	const struct thermal_trip *trip;

	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", .data = hi6220_thermal_probe },
	{ /* 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;
	int const (*platform_probe)(struct hisi_thermal_data *);
	struct device *dev = &pdev->dev;
	int ret;

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

	data->pdev = pdev;
	platform_set_drvdata(pdev, data);

	platform_probe = of_device_get_match_data(dev);
	if (!platform_probe) {
		dev_err(dev, "failed to get probe func\n");
		return -EINVAL;
	}

	ret = platform_probe(data);
	if (ret)
		return ret;

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

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

	if (data->irq) {
		ret = devm_request_threaded_irq(dev, data->irq, NULL,
				hisi_thermal_alarm_irq_thread,
				IRQF_ONESHOT, "hisi_thermal", data);
		if (ret < 0) {
			dev_err(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);

	data->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);

	data->disable_sensor(data);

	return 0;
}

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

	return data->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>
a160a465	26	#include <linux/of_device.h>
9a5238a9	27
	28	#include "thermal_core.h"
	29
5ed82b79 KW	30	#define HI6220_TEMP0_LAG (0x0)
	31	#define HI6220_TEMP0_TH (0x4)
	32	#define HI6220_TEMP0_RST_TH (0x8)
	33	#define HI6220_TEMP0_CFG (0xC)
a160a465	34	#define HI6220_TEMP0_CFG_SS_MSK (0xF000)
5ed82b79 KW	35	#define HI6220_TEMP0_CFG_HDAK_MSK (0x30)
	36	#define HI6220_TEMP0_EN (0x10)
	37	#define HI6220_TEMP0_INT_EN (0x14)
	38	#define HI6220_TEMP0_INT_CLR (0x18)
	39	#define HI6220_TEMP0_RST_MSK (0x1C)
	40	#define HI6220_TEMP0_VALUE (0x28)
	41
	42	#define HI6220_TEMP_BASE (-60000)
	43	#define HI6220_TEMP_RESET (100000)
	44	#define HI6220_TEMP_STEP (785)
a160a465	45	#define HI6220_TEMP_LAG (3500)
5ed82b79 KW	46
5ed82b79 KW	47	#define HI6220_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 {
a160a465 KW	56	int (get_temp)(struct hisi_thermal_data data);
	57	int (enable_sensor)(struct hisi_thermal_data data);
	58	int (disable_sensor)(struct hisi_thermal_data data);
	59	int (irq_handler)(struct hisi_thermal_data data);
9a5238a9	60	struct platform_device *pdev;
9a5238a9	61	struct clk *clk;
609f26dc	62	struct hisi_thermal_sensor sensor;
9a5238a9	63	void __iomem *regs;
609f26dc	64	int irq;
9a5238a9	65	};
9a5238a9	66
48880b97 DL	67	/*
	68	* The temperature computation on the tsensor is as follow:
	69	* Unit: millidegree Celsius
e42bbe11	70	* Step: 200/255 (0.7843)
48880b97 DL	71	* Temperature base: -60°C
48880b97 DL	72	*
e42bbe11	73	* The register is programmed in temperature steps, every step is 785
48880b97 DL	74	* millidegree and begins at -60 000 m°C
	75	*
	76	* The temperature from the steps:
	77	*
e42bbe11	78	* Temp = TempBase + (steps x 785)
48880b97 DL	79	*
	80	* and the steps from the temperature:
	81	*
e42bbe11	82	* steps = (Temp - TempBase) / 785
48880b97 DL	83	*
48880b97 DL	84	*/
5ed82b79	85	static inline int hi6220_thermal_step_to_temp(int step)
9a5238a9	86	{
5ed82b79	87	return HI6220_TEMP_BASE + (step * HI6220_TEMP_STEP);
9a5238a9	88	}
9a5238a9	89
5ed82b79	90	static inline int hi6220_thermal_temp_to_step(int temp)
9a5238a9	91	{
5ed82b79	92	return DIV_ROUND_UP(temp - HI6220_TEMP_BASE, HI6220_TEMP_STEP);
db2b0332 DL	93	}
db2b0332 DL	94
10d7e9a9 DL	95	/*
	96	* The lag register contains 5 bits encoding the temperature in steps.
	97	*
	98	* Each time the temperature crosses the threshold boundary, an
	99	* interrupt is raised. It could be when the temperature is going
	100	* above the threshold or below. However, if the temperature is
	101	* fluctuating around this value due to the load, we can receive
	102	* several interrupts which may not desired.
	103	*
	104	* We can setup a temperature representing the delta between the
	105	* threshold and the current temperature when the temperature is
	106	* decreasing.
	107	*
	108	* For instance: the lag register is 5°C, the threshold is 65°C, when
	109	* the temperature reaches 65°C an interrupt is raised and when the
	110	* temperature decrease to 65°C - 5°C another interrupt is raised.
	111	*
	112	* A very short lag can lead to an interrupt storm, a long lag
	113	* increase the latency to react to the temperature changes. In our
	114	* case, that is not really a problem as we are polling the
	115	* temperature.
	116	*
	117	* [0:4] : lag register
	118	*
5ed82b79	119	* The temperature is coded in steps, cf. HI6220_TEMP_STEP.
10d7e9a9 DL	120	*
	121	* Min : 0x00 : 0.0 °C
	122	* Max : 0x1F : 24.3 °C
	123	*
	124	* The 'value' parameter is in milliCelsius.
	125	*/
5ed82b79	126	static inline void hi6220_thermal_set_lag(void __iomem *addr, int value)
1e11b014	127	{
5ed82b79 KW	128	writel(DIV_ROUND_UP(value, HI6220_TEMP_STEP) & 0x1F,
5ed82b79 KW	129	addr + HI6220_TEMP0_LAG);
1e11b014 DL	130	}
1e11b014 DL	131
5ed82b79	132	static inline void hi6220_thermal_alarm_clear(void __iomem *addr, int value)
1e11b014	133	{
5ed82b79	134	writel(value, addr + HI6220_TEMP0_INT_CLR);
1e11b014 DL	135	}
1e11b014 DL	136
5ed82b79	137	static inline void hi6220_thermal_alarm_enable(void __iomem *addr, int value)
1e11b014	138	{
5ed82b79	139	writel(value, addr + HI6220_TEMP0_INT_EN);
1e11b014 DL	140	}
1e11b014 DL	141
5ed82b79	142	static inline void hi6220_thermal_alarm_set(void __iomem *addr, int temp)
1e11b014	143	{
5ed82b79 KW	144	writel(hi6220_thermal_temp_to_step(temp) \| 0x0FFFFFF00,
5ed82b79 KW	145	addr + HI6220_TEMP0_TH);
1e11b014 DL	146	}
1e11b014 DL	147
5ed82b79	148	static inline void hi6220_thermal_reset_set(void __iomem *addr, int temp)
1e11b014	149	{
5ed82b79	150	writel(hi6220_thermal_temp_to_step(temp), addr + HI6220_TEMP0_RST_TH);
1e11b014 DL	151	}
1e11b014 DL	152
5ed82b79	153	static inline void hi6220_thermal_reset_enable(void __iomem *addr, int value)
1e11b014	154	{
5ed82b79	155	writel(value, addr + HI6220_TEMP0_RST_MSK);
1e11b014 DL	156	}
1e11b014 DL	157
5ed82b79	158	static inline void hi6220_thermal_enable(void __iomem *addr, int value)
1e11b014	159	{
5ed82b79	160	writel(value, addr + HI6220_TEMP0_EN);
1e11b014 DL	161	}
1e11b014 DL	162
5ed82b79	163	static inline int hi6220_thermal_get_temperature(void __iomem *addr)
1e11b014	164	{
5ed82b79	165	return hi6220_thermal_step_to_temp(readl(addr + HI6220_TEMP0_VALUE));
1e11b014 DL	166	}
1e11b014 DL	167
b424315a DL	168	/*
	169	* Temperature configuration register - Sensor selection
	170	*
	171	* Bits [19:12]
	172	*
	173	* 0x0: local sensor (default)
	174	* 0x1: remote sensor 1 (ACPU cluster 1)
	175	* 0x2: remote sensor 2 (ACPU cluster 0)
	176	* 0x3: remote sensor 3 (G3D)
	177	*/
5ed82b79	178	static inline void hi6220_thermal_sensor_select(void __iomem *addr, int sensor)
1e11b014	179	{
5ed82b79 KW	180	writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_SS_MSK) \|
5ed82b79 KW	181	(sensor << 12), addr + HI6220_TEMP0_CFG);
1e11b014 DL	182	}
1e11b014 DL	183
b424315a DL	184	/*
	185	* Temperature configuration register - Hdak conversion polling interval
	186	*
	187	* Bits [5:4]
	188	*
	189	* 0x0 : 0.768 ms
	190	* 0x1 : 6.144 ms
	191	* 0x2 : 49.152 ms
	192	* 0x3 : 393.216 ms
	193	*/
5ed82b79	194	static inline void hi6220_thermal_hdak_set(void __iomem *addr, int value)
1e11b014	195	{
5ed82b79 KW	196	writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_HDAK_MSK) \|
5ed82b79 KW	197	(value << 4), addr + HI6220_TEMP0_CFG);
1e11b014 DL	198	}
1e11b014 DL	199
a160a465 KW	200	static int hi6220_thermal_irq_handler(struct hisi_thermal_data *data)
	201	{
	202	hi6220_thermal_alarm_clear(data->regs, 1);
	203	return 0;
	204	}
	205
	206	static int hi6220_thermal_get_temp(struct hisi_thermal_data *data)
	207	{
	208	return hi6220_thermal_get_temperature(data->regs);
	209	}
	210
	211	static int hi6220_thermal_disable_sensor(struct hisi_thermal_data *data)
9a5238a9	212	{
9a5238a9	213	/* disable sensor module */
5ed82b79 KW	214	hi6220_thermal_enable(data->regs, 0);
	215	hi6220_thermal_alarm_enable(data->regs, 0);
	216	hi6220_thermal_reset_enable(data->regs, 0);
943c0f6a KW	217
943c0f6a KW	218	clk_disable_unprepare(data->clk);
a160a465 KW	219
a160a465 KW	220	return 0;
9a5238a9	221	}
9a5238a9	222
5ed82b79	223	static int hi6220_thermal_enable_sensor(struct hisi_thermal_data *data)
a0678da8 KW	224	{
	225	struct hisi_thermal_sensor *sensor = &data->sensor;
	226	int ret;
	227
	228	/* enable clock for tsensor */
	229	ret = clk_prepare_enable(data->clk);
	230	if (ret)
	231	return ret;
	232
	233	/* disable module firstly */
5ed82b79 KW	234	hi6220_thermal_reset_enable(data->regs, 0);
5ed82b79 KW	235	hi6220_thermal_enable(data->regs, 0);
a0678da8 KW	236
a0678da8 KW	237	/* select sensor id */
5ed82b79	238	hi6220_thermal_sensor_select(data->regs, sensor->id);
a0678da8 KW	239
a0678da8 KW	240	/* setting the hdak time */
5ed82b79	241	hi6220_thermal_hdak_set(data->regs, 0);
a0678da8 KW	242
a0678da8 KW	243	/* setting lag value between current temp and the threshold */
5ed82b79	244	hi6220_thermal_set_lag(data->regs, HI6220_TEMP_LAG);
a0678da8 KW	245
a0678da8 KW	246	/* enable for interrupt */
5ed82b79	247	hi6220_thermal_alarm_set(data->regs, sensor->thres_temp);
a0678da8	248
5ed82b79	249	hi6220_thermal_reset_set(data->regs, HI6220_TEMP_RESET);
a0678da8 KW	250
a0678da8 KW	251	/* enable module */
5ed82b79 KW	252	hi6220_thermal_reset_enable(data->regs, 1);
5ed82b79 KW	253	hi6220_thermal_enable(data->regs, 1);
a0678da8	254
5ed82b79 KW	255	hi6220_thermal_alarm_clear(data->regs, 0);
5ed82b79 KW	256	hi6220_thermal_alarm_enable(data->regs, 1);
a0678da8 KW	257
	258	return 0;
	259	}
	260
a160a465 KW	261	static int hi6220_thermal_probe(struct hisi_thermal_data *data)
	262	{
	263	struct platform_device *pdev = data->pdev;
	264	struct device *dev = &pdev->dev;
	265	struct resource *res;
	266	int ret;
	267
	268	data->get_temp = hi6220_thermal_get_temp;
	269	data->enable_sensor = hi6220_thermal_enable_sensor;
	270	data->disable_sensor = hi6220_thermal_disable_sensor;
	271	data->irq_handler = hi6220_thermal_irq_handler;
	272
	273	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	274	data->regs = devm_ioremap_resource(dev, res);
	275	if (IS_ERR(data->regs)) {
	276	dev_err(dev, "failed to get io address\n");
	277	return PTR_ERR(data->regs);
	278	}
	279
	280	data->clk = devm_clk_get(dev, "thermal_clk");
	281	if (IS_ERR(data->clk)) {
	282	ret = PTR_ERR(data->clk);
	283	if (ret != -EPROBE_DEFER)
	284	dev_err(dev, "failed to get thermal clk: %d\n", ret);
	285	return ret;
	286	}
	287
	288	data->irq = platform_get_irq(pdev, 0);
	289	if (data->irq < 0)
	290	return data->irq;
	291
	292	data->sensor.id = HI6220_DEFAULT_SENSOR;
	293
	294	return 0;
	295	}
	296
81d7cb79	297	static int hisi_thermal_get_temp(void __data, int temp)
9a5238a9	298	{
81d7cb79 DL	299	struct hisi_thermal_data *data = __data;
81d7cb79 DL	300	struct hisi_thermal_sensor *sensor = &data->sensor;
9a5238a9	301
a160a465	302	*temp = data->get_temp(data);
9a5238a9	303
10d7e9a9 DL	304	dev_dbg(&data->pdev->dev, "id=%d, temp=%d, thres=%d\n",
10d7e9a9 DL	305	sensor->id, *temp, sensor->thres_temp);
9a5238a9	306
	307	return 0;
	308	}
	309
3fe156f1	310	static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
9a5238a9	311	.get_temp = hisi_thermal_get_temp,
	312	};
	313
10d7e9a9	314	static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
9a5238a9	315	{
9a5238a9	316	struct hisi_thermal_data *data = dev;
609f26dc	317	struct hisi_thermal_sensor *sensor = &data->sensor;
5ed82b79	318	int temp = 0;
9a5238a9	319
a160a465	320	data->irq_handler(data);
9a5238a9	321
5ed82b79	322	hisi_thermal_get_temp(data, &temp);
9a5238a9	323
10d7e9a9 DL	324	if (temp >= sensor->thres_temp) {
	325	dev_crit(&data->pdev->dev, "THERMAL ALARM: %d > %d\n",
	326	temp, sensor->thres_temp);
9a5238a9	327
609f26dc	328	thermal_zone_device_update(data->sensor.tzd,
10d7e9a9	329	THERMAL_EVENT_UNSPECIFIED);
9a5238a9	330
5ed82b79	331	} else {
10d7e9a9 DL	332	dev_crit(&data->pdev->dev, "THERMAL ALARM stopped: %d < %d\n",
	333	temp, sensor->thres_temp);
	334	}
9a5238a9	335
	336	return IRQ_HANDLED;
	337	}
	338
	339	static int hisi_thermal_register_sensor(struct platform_device *pdev,
	340	struct hisi_thermal_data *data,
a160a465	341	struct hisi_thermal_sensor *sensor)
9a5238a9	342	{
	343	int ret, i;
	344	const struct thermal_trip *trip;
	345
44a520d8	346	sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
81d7cb79 DL	347	sensor->id, data,
81d7cb79 DL	348	&hisi_of_thermal_ops);
9a5238a9	349	if (IS_ERR(sensor->tzd)) {
9a5238a9	350	ret = PTR_ERR(sensor->tzd);
439dc968	351	sensor->tzd = NULL;
9a5238a9	352	dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
	353	sensor->id, ret);
	354	return ret;
	355	}
	356
	357	trip = of_thermal_get_trip_points(sensor->tzd);
	358
	359	for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
	360	if (trip[i].type == THERMAL_TRIP_PASSIVE) {
e42bbe11	361	sensor->thres_temp = trip[i].temperature;
9a5238a9	362	break;
	363	}
	364	}
	365
	366	return 0;
	367	}
	368
	369	static const struct of_device_id of_hisi_thermal_match[] = {
a160a465	370	{ .compatible = "hisilicon,tsensor", .data = hi6220_thermal_probe },
9a5238a9	371	{ /* end */ }
	372	};
	373	MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);
	374
	375	static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
	376	bool on)
	377	{
	378	struct thermal_zone_device *tzd = sensor->tzd;
	379
	380	tzd->ops->set_mode(tzd,
	381	on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
	382	}
	383
	384	static int hisi_thermal_probe(struct platform_device *pdev)
	385	{
	386	struct hisi_thermal_data *data;
a160a465 KW	387	int const (platform_probe)(struct hisi_thermal_data );
a160a465 KW	388	struct device *dev = &pdev->dev;
9a5238a9	389	int ret;
9a5238a9	390
a160a465	391	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
9a5238a9	392	if (!data)
	393	return -ENOMEM;
	394
9a5238a9	395	data->pdev = pdev;
a160a465	396	platform_set_drvdata(pdev, data);
9a5238a9	397
a160a465 KW	398	platform_probe = of_device_get_match_data(dev);
	399	if (!platform_probe) {
	400	dev_err(dev, "failed to get probe func\n");
	401	return -EINVAL;
9a5238a9	402	}
9a5238a9	403
a160a465 KW	404	ret = platform_probe(data);
a160a465 KW	405	if (ret)
9a5238a9	406	return ret;
9a5238a9	407
ff4ec299	408	ret = hisi_thermal_register_sensor(pdev, data,
a160a465	409	&data->sensor);
ff4ec299	410	if (ret) {
a160a465	411	dev_err(dev, "failed to register thermal sensor: %d\n", ret);
ff4ec299	412	return ret;
9a5238a9	413	}
9a5238a9	414
a160a465	415	ret = data->enable_sensor(data);
10d7e9a9	416	if (ret) {
a160a465	417	dev_err(dev, "Failed to setup the sensor: %d\n", ret);
10d7e9a9 DL	418	return ret;
10d7e9a9 DL	419	}
ff4ec299	420
a160a465 KW	421	if (data->irq) {
	422	ret = devm_request_threaded_irq(dev, data->irq, NULL,
	423	hisi_thermal_alarm_irq_thread,
	424	IRQF_ONESHOT, "hisi_thermal", data);
	425	if (ret < 0) {
	426	dev_err(dev, "failed to request alarm irq: %d\n", ret);
	427	return ret;
	428	}
2cb4de78 DL	429	}
2cb4de78 DL	430
609f26dc	431	hisi_thermal_toggle_sensor(&data->sensor, true);
c176b10b	432
9a5238a9	433	return 0;
9a5238a9	434	}
	435
	436	static int hisi_thermal_remove(struct platform_device *pdev)
	437	{
	438	struct hisi_thermal_data *data = platform_get_drvdata(pdev);
609f26dc	439	struct hisi_thermal_sensor *sensor = &data->sensor;
9a5238a9	440
ff4ec299	441	hisi_thermal_toggle_sensor(sensor, false);
a160a465 KW	442
a160a465 KW	443	data->disable_sensor(data);
9a5238a9	444
	445	return 0;
	446	}
	447
	448	#ifdef CONFIG_PM_SLEEP
	449	static int hisi_thermal_suspend(struct device *dev)
	450	{
	451	struct hisi_thermal_data *data = dev_get_drvdata(dev);
	452
a160a465	453	data->disable_sensor(data);
9a5238a9	454
9a5238a9	455	return 0;
	456	}
	457
	458	static int hisi_thermal_resume(struct device *dev)
	459	{
	460	struct hisi_thermal_data *data = dev_get_drvdata(dev);
	461
a160a465	462	return data->enable_sensor(data);
9a5238a9	463	}
	464	#endif
	465
	466	static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
	467	hisi_thermal_suspend, hisi_thermal_resume);
	468
	469	static struct platform_driver hisi_thermal_driver = {
	470	.driver = {
	471	.name = "hisi_thermal",
9a5238a9	472	.pm = &hisi_thermal_pm_ops,
	473	.of_match_table = of_hisi_thermal_match,
	474	},
	475	.probe = hisi_thermal_probe,
	476	.remove = hisi_thermal_remove,
	477	};
	478
	479	module_platform_driver(hisi_thermal_driver);
	480
	481	MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
	482	MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
	483	MODULE_DESCRIPTION("Hisilicon thermal driver");
	484	MODULE_LICENSE("GPL v2");