[linux-block.git] / drivers / thermal / spear_thermal.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * SPEAr thermal driver.
 *
 * Copyright (C) 2011-2012 ST Microelectronics
 * Author: Vincenzo Frascino <vincenzo.frascino@st.com>
 */

#include <linux/clk.h>
#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 MD_FACTOR	1000

/* SPEAr Thermal Sensor Dev Structure */
struct spear_thermal_dev {
	/* pointer to base address of the thermal sensor */
	void __iomem *thermal_base;
	/* clk structure */
	struct clk *clk;
	/* pointer to thermal flags */
	unsigned int flags;
};

static inline int thermal_get_temp(struct thermal_zone_device *thermal,
				int *temp)
{
	struct spear_thermal_dev *stdev = thermal_zone_device_priv(thermal);

	/*
	 * Data are ready to be read after 628 usec from POWERDOWN signal
	 * (PDN) = 1
	 */
	*temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR;
	return 0;
}

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

static int __maybe_unused spear_thermal_suspend(struct device *dev)
{
	struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev);
	struct spear_thermal_dev *stdev = thermal_zone_device_priv(spear_thermal);
	unsigned int actual_mask = 0;

	/* Disable SPEAr Thermal Sensor */
	actual_mask = readl_relaxed(stdev->thermal_base);
	writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);

	clk_disable(stdev->clk);
	dev_info(dev, "Suspended.\n");

	return 0;
}

static int __maybe_unused spear_thermal_resume(struct device *dev)
{
	struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev);
	struct spear_thermal_dev *stdev = thermal_zone_device_priv(spear_thermal);
	unsigned int actual_mask = 0;
	int ret = 0;

	ret = clk_enable(stdev->clk);
	if (ret) {
		dev_err(dev, "Can't enable clock\n");
		return ret;
	}

	/* Enable SPEAr Thermal Sensor */
	actual_mask = readl_relaxed(stdev->thermal_base);
	writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base);

	dev_info(dev, "Resumed.\n");

	return 0;
}

static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend,
		spear_thermal_resume);

static int spear_thermal_probe(struct platform_device *pdev)
{
	struct thermal_zone_device *spear_thermal = NULL;
	struct spear_thermal_dev *stdev;
	struct device_node *np = pdev->dev.of_node;
	int ret = 0, val;

	if (!np || !of_property_read_u32(np, "st,thermal-flags", &val)) {
		dev_err(&pdev->dev, "Failed: DT Pdata not passed\n");
		return -EINVAL;
	}

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

	/* Enable thermal sensor */
	stdev->thermal_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
	if (IS_ERR(stdev->thermal_base))
		return PTR_ERR(stdev->thermal_base);

	stdev->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(stdev->clk)) {
		dev_err(&pdev->dev, "Can't get clock\n");
		return PTR_ERR(stdev->clk);
	}

	ret = clk_enable(stdev->clk);
	if (ret) {
		dev_err(&pdev->dev, "Can't enable clock\n");
		return ret;
	}

	stdev->flags = val;
	writel_relaxed(stdev->flags, stdev->thermal_base);

	spear_thermal = thermal_zone_device_register("spear_thermal", 0, 0,
				stdev, &ops, NULL, 0, 0);
	if (IS_ERR(spear_thermal)) {
		dev_err(&pdev->dev, "thermal zone device is NULL\n");
		ret = PTR_ERR(spear_thermal);
		goto disable_clk;
	}
	ret = thermal_zone_device_enable(spear_thermal);
	if (ret) {
		dev_err(&pdev->dev, "Cannot enable thermal zone\n");
		goto unregister_tzd;
	}

	platform_set_drvdata(pdev, spear_thermal);

	dev_info(&pdev->dev, "Thermal Sensor Loaded at: 0x%p.\n",
			stdev->thermal_base);

	return 0;

unregister_tzd:
	thermal_zone_device_unregister(spear_thermal);
disable_clk:
	clk_disable(stdev->clk);

	return ret;
}

static int spear_thermal_exit(struct platform_device *pdev)
{
	unsigned int actual_mask = 0;
	struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
	struct spear_thermal_dev *stdev = thermal_zone_device_priv(spear_thermal);

	thermal_zone_device_unregister(spear_thermal);

	/* Disable SPEAr Thermal Sensor */
	actual_mask = readl_relaxed(stdev->thermal_base);
	writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);

	clk_disable(stdev->clk);

	return 0;
}

static const struct of_device_id spear_thermal_id_table[] = {
	{ .compatible = "st,thermal-spear1340" },
	{}
};
MODULE_DEVICE_TABLE(of, spear_thermal_id_table);

static struct platform_driver spear_thermal_driver = {
	.probe = spear_thermal_probe,
	.remove = spear_thermal_exit,
	.driver = {
		.name = "spear_thermal",
		.pm = &spear_thermal_pm_ops,
		.of_match_table = spear_thermal_id_table,
	},
};

module_platform_driver(spear_thermal_driver);

MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>");
MODULE_DESCRIPTION("SPEAr thermal driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
9c92ab61	1	// SPDX-License-Identifier: GPL-2.0-only
6a92c366 VF	2	/*
	3	* SPEAr thermal driver.
	4	*
	5	* Copyright (C) 2011-2012 ST Microelectronics
	6	* Author: Vincenzo Frascino <vincenzo.frascino@st.com>
6a92c366 VF	7	*/
	8
	9	#include <linux/clk.h>
	10	#include <linux/device.h>
	11	#include <linux/err.h>
	12	#include <linux/io.h>
	13	#include <linux/kernel.h>
b9c7aff4	14	#include <linux/of.h>
6a92c366 VF	15	#include <linux/module.h>
6a92c366 VF	16	#include <linux/platform_device.h>
6a92c366 VF	17	#include <linux/thermal.h>
	18
	19	#define MD_FACTOR 1000
	20
	21	/* SPEAr Thermal Sensor Dev Structure */
	22	struct spear_thermal_dev {
	23	/* pointer to base address of the thermal sensor */
	24	void __iomem *thermal_base;
	25	/* clk structure */
	26	struct clk *clk;
	27	/* pointer to thermal flags */
	28	unsigned int flags;
	29	};
	30
	31	static inline int thermal_get_temp(struct thermal_zone_device *thermal,
17e8351a	32	int *temp)
6a92c366	33	{
5f68d078	34	struct spear_thermal_dev *stdev = thermal_zone_device_priv(thermal);
6a92c366 VF	35
	36	/*
	37	* Data are ready to be read after 628 usec from POWERDOWN signal
	38	* (PDN) = 1
	39	*/
de716e32	40	temp = (readl_relaxed(stdev->thermal_base) & 0x7F) MD_FACTOR;
6a92c366 VF	41	return 0;
	42	}
	43
	44	static struct thermal_zone_device_ops ops = {
	45	.get_temp = thermal_get_temp,
	46	};
	47
d612c64d	48	static int __maybe_unused spear_thermal_suspend(struct device *dev)
6a92c366	49	{
3fc62efe	50	struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev);
5f68d078	51	struct spear_thermal_dev *stdev = thermal_zone_device_priv(spear_thermal);
6a92c366 VF	52	unsigned int actual_mask = 0;
	53
	54	/* Disable SPEAr Thermal Sensor */
de716e32 VK	55	actual_mask = readl_relaxed(stdev->thermal_base);
de716e32 VK	56	writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
6a92c366 VF	57
	58	clk_disable(stdev->clk);
	59	dev_info(dev, "Suspended.\n");
	60
	61	return 0;
	62	}
	63
d612c64d	64	static int __maybe_unused spear_thermal_resume(struct device *dev)
6a92c366	65	{
3fc62efe	66	struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev);
5f68d078	67	struct spear_thermal_dev *stdev = thermal_zone_device_priv(spear_thermal);
6a92c366 VF	68	unsigned int actual_mask = 0;
	69	int ret = 0;
	70
	71	ret = clk_enable(stdev->clk);
	72	if (ret) {
3fc62efe	73	dev_err(dev, "Can't enable clock\n");
6a92c366 VF	74	return ret;
	75	}
	76
	77	/* Enable SPEAr Thermal Sensor */
de716e32 VK	78	actual_mask = readl_relaxed(stdev->thermal_base);
de716e32 VK	79	writel_relaxed(actual_mask \| stdev->flags, stdev->thermal_base);
6a92c366 VF	80
	81	dev_info(dev, "Resumed.\n");
	82
	83	return 0;
	84	}
6a92c366 VF	85
	86	static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend,
	87	spear_thermal_resume);
	88
	89	static int spear_thermal_probe(struct platform_device *pdev)
	90	{
	91	struct thermal_zone_device *spear_thermal = NULL;
	92	struct spear_thermal_dev *stdev;
b9c7aff4	93	struct device_node *np = pdev->dev.of_node;
b9c7aff4 VK	94	int ret = 0, val;
	95
	96	if (!np \|\| !of_property_read_u32(np, "st,thermal-flags", &val)) {
	97	dev_err(&pdev->dev, "Failed: DT Pdata not passed\n");
	98	return -EINVAL;
	99	}
6a92c366	100
6a92c366	101	stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL);
fa018d3e	102	if (!stdev)
6a92c366	103	return -ENOMEM;
6a92c366 VF	104
6a92c366 VF	105	/* Enable thermal sensor */
f8887fdc	106	stdev->thermal_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
c21bec86	107	if (IS_ERR(stdev->thermal_base))
253e3ae1	108	return PTR_ERR(stdev->thermal_base);
6a92c366	109
03b79bda	110	stdev->clk = devm_clk_get(&pdev->dev, NULL);
6a92c366 VF	111	if (IS_ERR(stdev->clk)) {
	112	dev_err(&pdev->dev, "Can't get clock\n");
	113	return PTR_ERR(stdev->clk);
	114	}
	115
	116	ret = clk_enable(stdev->clk);
	117	if (ret) {
	118	dev_err(&pdev->dev, "Can't enable clock\n");
03b79bda	119	return ret;
6a92c366 VF	120	}
6a92c366 VF	121
b9c7aff4	122	stdev->flags = val;
de716e32	123	writel_relaxed(stdev->flags, stdev->thermal_base);
6a92c366	124
c56f5c03	125	spear_thermal = thermal_zone_device_register("spear_thermal", 0, 0,
50125a9b	126	stdev, &ops, NULL, 0, 0);
03ee62f0	127	if (IS_ERR(spear_thermal)) {
6a92c366	128	dev_err(&pdev->dev, "thermal zone device is NULL\n");
03ee62f0	129	ret = PTR_ERR(spear_thermal);
6a92c366 VF	130	goto disable_clk;
6a92c366 VF	131	}
bbcf90c0 AP	132	ret = thermal_zone_device_enable(spear_thermal);
	133	if (ret) {
	134	dev_err(&pdev->dev, "Cannot enable thermal zone\n");
	135	goto unregister_tzd;
	136	}
6a92c366 VF	137
	138	platform_set_drvdata(pdev, spear_thermal);
	139
25e43976	140	dev_info(&pdev->dev, "Thermal Sensor Loaded at: 0x%p.\n",
6a92c366 VF	141	stdev->thermal_base);
	142
	143	return 0;
	144
bbcf90c0 AP	145	unregister_tzd:
bbcf90c0 AP	146	thermal_zone_device_unregister(spear_thermal);
6a92c366 VF	147	disable_clk:
6a92c366 VF	148	clk_disable(stdev->clk);
6a92c366 VF	149
	150	return ret;
	151	}
	152
	153	static int spear_thermal_exit(struct platform_device *pdev)
	154	{
	155	unsigned int actual_mask = 0;
	156	struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
5f68d078	157	struct spear_thermal_dev *stdev = thermal_zone_device_priv(spear_thermal);
6a92c366 VF	158
6a92c366 VF	159	thermal_zone_device_unregister(spear_thermal);
6a92c366 VF	160
6a92c366 VF	161	/* Disable SPEAr Thermal Sensor */
de716e32 VK	162	actual_mask = readl_relaxed(stdev->thermal_base);
de716e32 VK	163	writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
6a92c366 VF	164
6a92c366 VF	165	clk_disable(stdev->clk);
6a92c366 VF	166
	167	return 0;
	168	}
	169
b9c7aff4 VK	170	static const struct of_device_id spear_thermal_id_table[] = {
	171	{ .compatible = "st,thermal-spear1340" },
	172	{}
	173	};
	174	MODULE_DEVICE_TABLE(of, spear_thermal_id_table);
	175
6a92c366 VF	176	static struct platform_driver spear_thermal_driver = {
	177	.probe = spear_thermal_probe,
	178	.remove = spear_thermal_exit,
	179	.driver = {
	180	.name = "spear_thermal",
6a92c366	181	.pm = &spear_thermal_pm_ops,
5454f211	182	.of_match_table = spear_thermal_id_table,
6a92c366 VF	183	},
	184	};
	185
	186	module_platform_driver(spear_thermal_driver);
	187
	188	MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>");
	189	MODULE_DESCRIPTION("SPEAr thermal driver");
	190	MODULE_LICENSE("GPL");