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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Dove thermal sensor driver
 *
 * Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
 */
#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,
			  int *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;

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	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);

	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",
		.of_match_table = 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
9c92ab61	1	// SPDX-License-Identifier: GPL-2.0-only
74ffa64c AL	2	/*
	3	* Dove thermal sensor driver
	4	*
	5	* Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
74ffa64c AL	6	*/
	7	#include <linux/device.h>
	8	#include <linux/err.h>
	9	#include <linux/io.h>
	10	#include <linux/kernel.h>
	11	#include <linux/of.h>
	12	#include <linux/module.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/thermal.h>
	15
	16	#define DOVE_THERMAL_TEMP_OFFSET 1
	17	#define DOVE_THERMAL_TEMP_MASK 0x1FF
	18
	19	/* Dove Thermal Manager Control and Status Register */
	20	#define PMU_TM_DISABLE_OFFS 0
	21	#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
	22
	23	/* Dove Theraml Diode Control 0 Register */
	24	#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
	25	#define PMU_TDC0_SEL_VCAL_OFFS 5
	26	#define PMU_TDC0_SEL_VCAL_MASK (0x3 << PMU_TDC0_SEL_VCAL_OFFS)
	27	#define PMU_TDC0_REF_CAL_CNT_OFFS 11
	28	#define PMU_TDC0_REF_CAL_CNT_MASK (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS)
	29	#define PMU_TDC0_AVG_NUM_OFFS 25
	30	#define PMU_TDC0_AVG_NUM_MASK (0x7 << PMU_TDC0_AVG_NUM_OFFS)
	31
	32	/* Dove Thermal Diode Control 1 Register */
	33	#define PMU_TEMP_DIOD_CTRL1_REG 0x04
	34	#define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10)
	35
	36	/* Dove Thermal Sensor Dev Structure */
	37	struct dove_thermal_priv {
	38	void __iomem *sensor;
	39	void __iomem *control;
	40	};
	41
	42	static int dove_init_sensor(const struct dove_thermal_priv *priv)
	43	{
	44	u32 reg;
	45	u32 i;
	46
	47	/* Configure the Diode Control Register #0 */
	48	reg = readl_relaxed(priv->control);
	49
	50	/* Use average of 2 */
	51	reg &= ~PMU_TDC0_AVG_NUM_MASK;
	52	reg \|= (0x1 << PMU_TDC0_AVG_NUM_OFFS);
	53
	54	/* Reference calibration value */
	55	reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
	56	reg \|= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS);
	57
	58	/* Set the high level reference for calibration */
	59	reg &= ~PMU_TDC0_SEL_VCAL_MASK;
	60	reg \|= (0x2 << PMU_TDC0_SEL_VCAL_OFFS);
	61	writel(reg, priv->control);
	62
	63	/* Reset the sensor */
	64	reg = readl_relaxed(priv->control);
	65	writel((reg \| PMU_TDC0_SW_RST_MASK), priv->control);
	66	writel(reg, priv->control);
	67
	68	/* Enable the sensor */
	69	reg = readl_relaxed(priv->sensor);
70	reg &= ~PMU_TM_DISABLE_MASK;
71	writel(reg, priv->sensor);
72
73	/* Poll the sensor for the first reading */
74	for (i = 0; i < 1000000; i++) {
75	reg = readl_relaxed(priv->sensor);
76	if (reg & DOVE_THERMAL_TEMP_MASK)
77	break;
78	}
79
80	if (i == 1000000)
81	return -EIO;
82
83	return 0;
84	}
85
86	static int dove_get_temp(struct thermal_zone_device *thermal,
17e8351a	87	int *temp)
74ffa64c AL	88	{
	89	unsigned long reg;
	90	struct dove_thermal_priv *priv = thermal->devdata;
	91
	92	/* Valid check */
	93	reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG);
	94	if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) {
	95	dev_err(&thermal->device,
	96	"Temperature sensor reading not valid\n");
	97	return -EIO;
	98	}
	99
	100	/*
2fd1db88 EG	101	* Calculate temperature. According to Marvell internal
	102	* documentation the formula for this is:
	103	* Celsius = (322-reg)/1.3625
74ffa64c AL	104	*/
	105	reg = readl_relaxed(priv->sensor);
	106	reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK;
2fd1db88	107	temp = ((3220000000UL - (10000000UL reg)) / 13625);
74ffa64c AL	108
	109	return 0;
	110	}
	111
	112	static struct thermal_zone_device_ops ops = {
	113	.get_temp = dove_get_temp,
	114	};
	115
	116	static const struct of_device_id dove_thermal_id_table[] = {
	117	{ .compatible = "marvell,dove-thermal" },
	118	{}
	119	};
	120
	121	static int dove_thermal_probe(struct platform_device *pdev)
	122	{
	123	struct thermal_zone_device *thermal = NULL;
	124	struct dove_thermal_priv *priv;
	125	struct resource *res;
	126	int ret;
	127
74ffa64c AL	128	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	129	if (!priv)
	130	return -ENOMEM;
	131
c28f692c	132	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
6bc51b66 SK	133	priv->sensor = devm_ioremap_resource(&pdev->dev, res);
	134	if (IS_ERR(priv->sensor))
	135	return PTR_ERR(priv->sensor);
74ffa64c AL	136
74ffa64c AL	137	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
6bc51b66 SK	138	priv->control = devm_ioremap_resource(&pdev->dev, res);
	139	if (IS_ERR(priv->control))
	140	return PTR_ERR(priv->control);
74ffa64c AL	141
	142	ret = dove_init_sensor(priv);
	143	if (ret) {
	144	dev_err(&pdev->dev, "Failed to initialize sensor\n");
	145	return ret;
	146	}
	147
	148	thermal = thermal_zone_device_register("dove_thermal", 0, 0,
	149	priv, &ops, NULL, 0, 0);
	150	if (IS_ERR(thermal)) {
	151	dev_err(&pdev->dev,
	152	"Failed to register thermal zone device\n");
	153	return PTR_ERR(thermal);
	154	}
	155
	156	platform_set_drvdata(pdev, thermal);
	157
	158	return 0;
	159	}
	160
	161	static int dove_thermal_exit(struct platform_device *pdev)
	162	{
	163	struct thermal_zone_device *dove_thermal =
	164	platform_get_drvdata(pdev);
	165
	166	thermal_zone_device_unregister(dove_thermal);
74ffa64c AL	167
	168	return 0;
	169	}
	170
	171	MODULE_DEVICE_TABLE(of, dove_thermal_id_table);
	172
	173	static struct platform_driver dove_thermal_driver = {
	174	.probe = dove_thermal_probe,
	175	.remove = dove_thermal_exit,
	176	.driver = {
	177	.name = "dove_thermal",
e0d68afa	178	.of_match_table = dove_thermal_id_table,
74ffa64c AL	179	},
	180	};
	181
	182	module_platform_driver(dove_thermal_driver);
	183
	184	MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
	185	MODULE_DESCRIPTION("Dove thermal driver");
	186	MODULE_LICENSE("GPL");