[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / thermal / dove_thermal.c

/*
 * Dove thermal sensor driver
 *
 * Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 */
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>

#define DOVE_THERMAL_TEMP_OFFSET	1
#define DOVE_THERMAL_TEMP_MASK		0x1FF

/* Dove Thermal Manager Control and Status Register */
#define PMU_TM_DISABLE_OFFS		0
#define PMU_TM_DISABLE_MASK		(0x1 << PMU_TM_DISABLE_OFFS)

/* Dove Theraml Diode Control 0 Register */
#define PMU_TDC0_SW_RST_MASK		(0x1 << 1)
#define PMU_TDC0_SEL_VCAL_OFFS		5
#define PMU_TDC0_SEL_VCAL_MASK		(0x3 << PMU_TDC0_SEL_VCAL_OFFS)
#define PMU_TDC0_REF_CAL_CNT_OFFS	11
#define PMU_TDC0_REF_CAL_CNT_MASK	(0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS)
#define PMU_TDC0_AVG_NUM_OFFS		25
#define PMU_TDC0_AVG_NUM_MASK		(0x7 << PMU_TDC0_AVG_NUM_OFFS)

/* Dove Thermal Diode Control 1 Register */
#define PMU_TEMP_DIOD_CTRL1_REG		0x04
#define PMU_TDC1_TEMP_VALID_MASK	(0x1 << 10)

/* Dove Thermal Sensor Dev Structure */
struct dove_thermal_priv {
	void __iomem *sensor;
	void __iomem *control;
};

static int dove_init_sensor(const struct dove_thermal_priv *priv)
{
	u32 reg;
	u32 i;

	/* Configure the Diode Control Register #0 */
	reg = readl_relaxed(priv->control);

	/* Use average of 2 */
	reg &= ~PMU_TDC0_AVG_NUM_MASK;
	reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS);

	/* Reference calibration value */
	reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
	reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS);

	/* Set the high level reference for calibration */
	reg &= ~PMU_TDC0_SEL_VCAL_MASK;
	reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS);
	writel(reg, priv->control);

	/* Reset the sensor */
	reg = readl_relaxed(priv->control);
	writel((reg | PMU_TDC0_SW_RST_MASK), priv->control);
	writel(reg, priv->control);

	/* Enable the sensor */
	reg = readl_relaxed(priv->sensor);
	reg &= ~PMU_TM_DISABLE_MASK;
	writel(reg, priv->sensor);

	/* Poll the sensor for the first reading */
	for (i = 0; i < 1000000; i++) {
		reg = readl_relaxed(priv->sensor);
		if (reg & DOVE_THERMAL_TEMP_MASK)
			break;
	}

	if (i == 1000000)
		return -EIO;

	return 0;
}

static int dove_get_temp(struct thermal_zone_device *thermal,
			  unsigned long *temp)
{
	unsigned long reg;
	struct dove_thermal_priv *priv = thermal->devdata;

	/* Valid check */
	reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG);
	if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) {
		dev_err(&thermal->device,
			"Temperature sensor reading not valid\n");
		return -EIO;
	}

	/*
	 * Calculate temperature. According to Marvell internal
	 * documentation the formula for this is:
	 * Celsius = (322-reg)/1.3625
	 */
	reg = readl_relaxed(priv->sensor);
	reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK;
	*temp = ((3220000000UL - (10000000UL * reg)) / 13625);

	return 0;
}

static struct thermal_zone_device_ops ops = {
	.get_temp = dove_get_temp,
};

static const struct of_device_id dove_thermal_id_table[] = {
	{ .compatible = "marvell,dove-thermal" },
	{}
};

static int dove_thermal_probe(struct platform_device *pdev)
{
	struct thermal_zone_device *thermal = NULL;
	struct dove_thermal_priv *priv;
	struct resource *res;
	int ret;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "Failed to get platform resource\n");
		return -ENODEV;
	}

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

	priv->sensor = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(priv->sensor))
		return PTR_ERR(priv->sensor);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	priv->control = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(priv->control))
		return PTR_ERR(priv->control);

	ret = dove_init_sensor(priv);
	if (ret) {
		dev_err(&pdev->dev, "Failed to initialize sensor\n");
		return ret;
	}

	thermal = thermal_zone_device_register("dove_thermal", 0, 0,
					       priv, &ops, NULL, 0, 0);
	if (IS_ERR(thermal)) {
		dev_err(&pdev->dev,
			"Failed to register thermal zone device\n");
		return PTR_ERR(thermal);
	}

	platform_set_drvdata(pdev, thermal);

	return 0;
}

static int dove_thermal_exit(struct platform_device *pdev)
{
	struct thermal_zone_device *dove_thermal =
		platform_get_drvdata(pdev);

	thermal_zone_device_unregister(dove_thermal);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

MODULE_DEVICE_TABLE(of, dove_thermal_id_table);

static struct platform_driver dove_thermal_driver = {
	.probe = dove_thermal_probe,
	.remove = dove_thermal_exit,
	.driver = {
		.name = "dove_thermal",
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(dove_thermal_id_table),
	},
};

module_platform_driver(dove_thermal_driver);

MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
MODULE_DESCRIPTION("Dove thermal driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
74ffa64c AL	1	/*
	2	* Dove thermal sensor driver
	3	*
	4	* Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
	5	*
	6	* This software is licensed under the terms of the GNU General Public
	7	* License version 2, as published by the Free Software Foundation, and
	8	* may be copied, distributed, and modified under those terms.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	*/
	16	#include <linux/device.h>
	17	#include <linux/err.h>
	18	#include <linux/io.h>
	19	#include <linux/kernel.h>
	20	#include <linux/of.h>
	21	#include <linux/module.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/thermal.h>
	24
	25	#define DOVE_THERMAL_TEMP_OFFSET 1
	26	#define DOVE_THERMAL_TEMP_MASK 0x1FF
	27
	28	/* Dove Thermal Manager Control and Status Register */
	29	#define PMU_TM_DISABLE_OFFS 0
	30	#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
	31
	32	/* Dove Theraml Diode Control 0 Register */
	33	#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
	34	#define PMU_TDC0_SEL_VCAL_OFFS 5
	35	#define PMU_TDC0_SEL_VCAL_MASK (0x3 << PMU_TDC0_SEL_VCAL_OFFS)
	36	#define PMU_TDC0_REF_CAL_CNT_OFFS 11
	37	#define PMU_TDC0_REF_CAL_CNT_MASK (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS)
	38	#define PMU_TDC0_AVG_NUM_OFFS 25
	39	#define PMU_TDC0_AVG_NUM_MASK (0x7 << PMU_TDC0_AVG_NUM_OFFS)
	40
	41	/* Dove Thermal Diode Control 1 Register */
	42	#define PMU_TEMP_DIOD_CTRL1_REG 0x04
	43	#define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10)
	44
	45	/* Dove Thermal Sensor Dev Structure */
	46	struct dove_thermal_priv {
	47	void __iomem *sensor;
	48	void __iomem *control;
	49	};
	50
	51	static int dove_init_sensor(const struct dove_thermal_priv *priv)
	52	{
	53	u32 reg;
	54	u32 i;
	55
	56	/* Configure the Diode Control Register #0 */
	57	reg = readl_relaxed(priv->control);
	58
	59	/* Use average of 2 */
	60	reg &= ~PMU_TDC0_AVG_NUM_MASK;
	61	reg \|= (0x1 << PMU_TDC0_AVG_NUM_OFFS);
	62
	63	/* Reference calibration value */
	64	reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
65	reg \|= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS);
66
67	/* Set the high level reference for calibration */
68	reg &= ~PMU_TDC0_SEL_VCAL_MASK;
69	reg \|= (0x2 << PMU_TDC0_SEL_VCAL_OFFS);
70	writel(reg, priv->control);
71
72	/* Reset the sensor */
73	reg = readl_relaxed(priv->control);
74	writel((reg \| PMU_TDC0_SW_RST_MASK), priv->control);
75	writel(reg, priv->control);
76
77	/* Enable the sensor */
78	reg = readl_relaxed(priv->sensor);
79	reg &= ~PMU_TM_DISABLE_MASK;
80	writel(reg, priv->sensor);
81
82	/* Poll the sensor for the first reading */
83	for (i = 0; i < 1000000; i++) {
84	reg = readl_relaxed(priv->sensor);
85	if (reg & DOVE_THERMAL_TEMP_MASK)
86	break;
87	}
88
89	if (i == 1000000)
90	return -EIO;
91
92	return 0;
93	}
94
95	static int dove_get_temp(struct thermal_zone_device *thermal,
96	unsigned long *temp)
97	{
98	unsigned long reg;
99	struct dove_thermal_priv *priv = thermal->devdata;
100
101	/* Valid check */
102	reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG);
103	if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) {
104	dev_err(&thermal->device,
105	"Temperature sensor reading not valid\n");
106	return -EIO;
107	}
108
109	/*
2fd1db88 EG	110	* Calculate temperature. According to Marvell internal
	111	* documentation the formula for this is:
	112	* Celsius = (322-reg)/1.3625
74ffa64c AL	113	*/
	114	reg = readl_relaxed(priv->sensor);
	115	reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK;
2fd1db88	116	temp = ((3220000000UL - (10000000UL reg)) / 13625);
74ffa64c AL	117
	118	return 0;
	119	}
	120
	121	static struct thermal_zone_device_ops ops = {
	122	.get_temp = dove_get_temp,
	123	};
	124
	125	static const struct of_device_id dove_thermal_id_table[] = {
	126	{ .compatible = "marvell,dove-thermal" },
	127	{}
	128	};
	129
	130	static int dove_thermal_probe(struct platform_device *pdev)
	131	{
	132	struct thermal_zone_device *thermal = NULL;
	133	struct dove_thermal_priv *priv;
	134	struct resource *res;
	135	int ret;
	136
	137	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	138	if (!res) {
	139	dev_err(&pdev->dev, "Failed to get platform resource\n");
	140	return -ENODEV;
	141	}
	142
	143	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	144	if (!priv)
	145	return -ENOMEM;
	146
6bc51b66 SK	147	priv->sensor = devm_ioremap_resource(&pdev->dev, res);
	148	if (IS_ERR(priv->sensor))
	149	return PTR_ERR(priv->sensor);
74ffa64c AL	150
74ffa64c AL	151	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
6bc51b66 SK	152	priv->control = devm_ioremap_resource(&pdev->dev, res);
	153	if (IS_ERR(priv->control))
	154	return PTR_ERR(priv->control);
74ffa64c AL	155
	156	ret = dove_init_sensor(priv);
	157	if (ret) {
	158	dev_err(&pdev->dev, "Failed to initialize sensor\n");
	159	return ret;
	160	}
	161
	162	thermal = thermal_zone_device_register("dove_thermal", 0, 0,
	163	priv, &ops, NULL, 0, 0);
	164	if (IS_ERR(thermal)) {
	165	dev_err(&pdev->dev,
	166	"Failed to register thermal zone device\n");
	167	return PTR_ERR(thermal);
	168	}
	169
	170	platform_set_drvdata(pdev, thermal);
	171
	172	return 0;
	173	}
	174
	175	static int dove_thermal_exit(struct platform_device *pdev)
	176	{
	177	struct thermal_zone_device *dove_thermal =
	178	platform_get_drvdata(pdev);
	179
	180	thermal_zone_device_unregister(dove_thermal);
	181	platform_set_drvdata(pdev, NULL);
	182
	183	return 0;
	184	}
	185
	186	MODULE_DEVICE_TABLE(of, dove_thermal_id_table);
	187
	188	static struct platform_driver dove_thermal_driver = {
	189	.probe = dove_thermal_probe,
	190	.remove = dove_thermal_exit,
	191	.driver = {
	192	.name = "dove_thermal",
	193	.owner = THIS_MODULE,
	194	.of_match_table = of_match_ptr(dove_thermal_id_table),
	195	},
	196	};
	197
	198	module_platform_driver(dove_thermal_driver);
	199
	200	MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
	201	MODULE_DESCRIPTION("Dove thermal driver");
	202	MODULE_LICENSE("GPL");