[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->devdata;

	/*
	 * 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 = spear_thermal->devdata;
	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 = spear_thermal->devdata;
	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;
	struct resource *res;
	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 */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	stdev->thermal_base = devm_ioremap_resource(&pdev->dev, res);
	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(&spear_thermal->device, "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 = spear_thermal->devdata;

	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 VF	33	{
	34	struct spear_thermal_dev *stdev = thermal->devdata;
	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);
6a92c366 VF	51	struct spear_thermal_dev *stdev = spear_thermal->devdata;
	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);
6a92c366 VF	67	struct spear_thermal_dev *stdev = spear_thermal->devdata;
	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;
253e3ae1	94	struct resource *res;
b9c7aff4 VK	95	int ret = 0, val;
	96
	97	if (!np \|\| !of_property_read_u32(np, "st,thermal-flags", &val)) {
	98	dev_err(&pdev->dev, "Failed: DT Pdata not passed\n");
	99	return -EINVAL;
	100	}
6a92c366	101
6a92c366	102	stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL);
fa018d3e	103	if (!stdev)
6a92c366	104	return -ENOMEM;
6a92c366 VF	105
6a92c366 VF	106	/* Enable thermal sensor */
c21bec86 ZR	107	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	108	stdev->thermal_base = devm_ioremap_resource(&pdev->dev, res);
	109	if (IS_ERR(stdev->thermal_base))
253e3ae1	110	return PTR_ERR(stdev->thermal_base);
6a92c366	111
03b79bda	112	stdev->clk = devm_clk_get(&pdev->dev, NULL);
6a92c366 VF	113	if (IS_ERR(stdev->clk)) {
	114	dev_err(&pdev->dev, "Can't get clock\n");
	115	return PTR_ERR(stdev->clk);
	116	}
	117
	118	ret = clk_enable(stdev->clk);
	119	if (ret) {
	120	dev_err(&pdev->dev, "Can't enable clock\n");
03b79bda	121	return ret;
6a92c366 VF	122	}
6a92c366 VF	123
b9c7aff4	124	stdev->flags = val;
de716e32	125	writel_relaxed(stdev->flags, stdev->thermal_base);
6a92c366	126
c56f5c03	127	spear_thermal = thermal_zone_device_register("spear_thermal", 0, 0,
50125a9b	128	stdev, &ops, NULL, 0, 0);
03ee62f0	129	if (IS_ERR(spear_thermal)) {
6a92c366	130	dev_err(&pdev->dev, "thermal zone device is NULL\n");
03ee62f0	131	ret = PTR_ERR(spear_thermal);
6a92c366 VF	132	goto disable_clk;
6a92c366 VF	133	}
bbcf90c0 AP	134	ret = thermal_zone_device_enable(spear_thermal);
	135	if (ret) {
	136	dev_err(&pdev->dev, "Cannot enable thermal zone\n");
	137	goto unregister_tzd;
	138	}
6a92c366 VF	139
	140	platform_set_drvdata(pdev, spear_thermal);
	141
	142	dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n",
	143	stdev->thermal_base);
	144
	145	return 0;
	146
bbcf90c0 AP	147	unregister_tzd:
bbcf90c0 AP	148	thermal_zone_device_unregister(spear_thermal);
6a92c366 VF	149	disable_clk:
6a92c366 VF	150	clk_disable(stdev->clk);
6a92c366 VF	151
	152	return ret;
	153	}
	154
	155	static int spear_thermal_exit(struct platform_device *pdev)
	156	{
	157	unsigned int actual_mask = 0;
	158	struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
	159	struct spear_thermal_dev *stdev = spear_thermal->devdata;
	160
	161	thermal_zone_device_unregister(spear_thermal);
6a92c366 VF	162
6a92c366 VF	163	/* Disable SPEAr Thermal Sensor */
de716e32 VK	164	actual_mask = readl_relaxed(stdev->thermal_base);
de716e32 VK	165	writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
6a92c366 VF	166
6a92c366 VF	167	clk_disable(stdev->clk);
6a92c366 VF	168
	169	return 0;
	170	}
	171
b9c7aff4 VK	172	static const struct of_device_id spear_thermal_id_table[] = {
	173	{ .compatible = "st,thermal-spear1340" },
	174	{}
	175	};
	176	MODULE_DEVICE_TABLE(of, spear_thermal_id_table);
	177
6a92c366 VF	178	static struct platform_driver spear_thermal_driver = {
	179	.probe = spear_thermal_probe,
	180	.remove = spear_thermal_exit,
	181	.driver = {
	182	.name = "spear_thermal",
6a92c366	183	.pm = &spear_thermal_pm_ops,
5454f211	184	.of_match_table = spear_thermal_id_table,
6a92c366 VF	185	},
	186	};
	187
	188	module_platform_driver(spear_thermal_driver);
	189
	190	MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>");
	191	MODULE_DESCRIPTION("SPEAr thermal driver");
	192	MODULE_LICENSE("GPL");