drivers/thermal/zx2967_thermal.c - kernel/msm-4.19 - Gitiles

 /*
  * ZTE's zx2967 family thermal sensor driver
  *
  * Copyright (C) 2017 ZTE Ltd.
  *
  * Author: Baoyou Xie <baoyou.xie@linaro.org>
  *
  * License terms: GNU General Public License (GPL) version 2
  */

 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/iopoll.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/thermal.h>

 /* Power Mode: 0->low 1->high */
 #define ZX2967_THERMAL_POWER_MODE	0
 #define ZX2967_POWER_MODE_LOW		0
 #define ZX2967_POWER_MODE_HIGH		1

 /* DCF Control Register */
 #define ZX2967_THERMAL_DCF		0x4
 #define ZX2967_DCF_EN			BIT(1)
 #define ZX2967_DCF_FREEZE		BIT(0)

 /* Selection Register */
 #define ZX2967_THERMAL_SEL		0x8

 /* Control Register */
 #define ZX2967_THERMAL_CTRL		0x10

 #define ZX2967_THERMAL_READY		BIT(12)
 #define ZX2967_THERMAL_TEMP_MASK	GENMASK(11, 0)
 #define ZX2967_THERMAL_ID_MASK		0x18
 #define ZX2967_THERMAL_ID		0x10

 #define ZX2967_GET_TEMP_TIMEOUT_US	(100 * 1024)

 /**
  * struct zx2967_thermal_priv - zx2967 thermal sensor private structure
  * @tzd: struct thermal_zone_device where the sensor is registered
  * @lock: prevents read sensor in parallel
  * @clk_topcrm: topcrm clk structure
  * @clk_apb: apb clk structure
  * @regs: pointer to base address of the thermal sensor
  */

 struct zx2967_thermal_priv {
 	struct thermal_zone_device	*tzd;
 	struct mutex			lock;
 	struct clk			*clk_topcrm;
 	struct clk			*clk_apb;
 	void __iomem			*regs;
 	struct device			*dev;
 };

 static int zx2967_thermal_get_temp(void *data, int *temp)
 {
 	void __iomem *regs;
 	struct zx2967_thermal_priv *priv = data;
 	u32 val;
 	int ret;

 	if (!priv->tzd)
 		return -EAGAIN;

 	regs = priv->regs;
 	mutex_lock(&priv->lock);
 	writel_relaxed(ZX2967_POWER_MODE_LOW,
 		       regs + ZX2967_THERMAL_POWER_MODE);
 	writel_relaxed(ZX2967_DCF_EN, regs + ZX2967_THERMAL_DCF);

 	val = readl_relaxed(regs + ZX2967_THERMAL_SEL);
 	val &= ~ZX2967_THERMAL_ID_MASK;
 	val |= ZX2967_THERMAL_ID;
 	writel_relaxed(val, regs + ZX2967_THERMAL_SEL);

 	/*
 	 * Must wait for a while, surely it's a bit odd.
 	 * otherwise temperature value we got has a few deviation, even if
 	 * the THERMAL_READY bit is set.
 	 */
 	usleep_range(100, 300);
 	ret = readx_poll_timeout(readl, regs + ZX2967_THERMAL_CTRL,
 				 val, val & ZX2967_THERMAL_READY, 300,
 				 ZX2967_GET_TEMP_TIMEOUT_US);
 	if (ret) {
 		dev_err(priv->dev, "Thermal sensor data timeout\n");
 		goto unlock;
 	}

 	writel_relaxed(ZX2967_DCF_FREEZE | ZX2967_DCF_EN,
 		       regs + ZX2967_THERMAL_DCF);
 	val = readl_relaxed(regs + ZX2967_THERMAL_CTRL)
 			 & ZX2967_THERMAL_TEMP_MASK;
 	writel_relaxed(ZX2967_POWER_MODE_HIGH,
 		       regs + ZX2967_THERMAL_POWER_MODE);

 	/*
 	 * Calculate temperature
 	 * In dts, slope is multiplied by 1000.
 	 */
 	*temp = DIV_ROUND_CLOSEST(((s32)val + priv->tzd->tzp->offset) * 1000,
 				  priv->tzd->tzp->slope);

 unlock:
 	mutex_unlock(&priv->lock);
 	return ret;
 }

 static struct thermal_zone_of_device_ops zx2967_of_thermal_ops = {
 	.get_temp = zx2967_thermal_get_temp,
 };

 static int zx2967_thermal_probe(struct platform_device *pdev)
 {
 	struct zx2967_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->regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(priv->regs))
 		return PTR_ERR(priv->regs);

 	priv->clk_topcrm = devm_clk_get(&pdev->dev, "topcrm");
 	if (IS_ERR(priv->clk_topcrm)) {
 		ret = PTR_ERR(priv->clk_topcrm);
 		dev_err(&pdev->dev, "failed to get topcrm clock: %d\n", ret);
 		return ret;
 	}

 	ret = clk_prepare_enable(priv->clk_topcrm);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to enable topcrm clock: %d\n",
 			ret);
 		return ret;
 	}

 	priv->clk_apb = devm_clk_get(&pdev->dev, "apb");
 	if (IS_ERR(priv->clk_apb)) {
 		ret = PTR_ERR(priv->clk_apb);
 		dev_err(&pdev->dev, "failed to get apb clock: %d\n", ret);
 		goto disable_clk_topcrm;
 	}

 	ret = clk_prepare_enable(priv->clk_apb);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to enable apb clock: %d\n",
 			ret);
 		goto disable_clk_topcrm;
 	}

 	mutex_init(&priv->lock);
 	priv->tzd = thermal_zone_of_sensor_register(&pdev->dev,
 					0, priv, &zx2967_of_thermal_ops);

 	if (IS_ERR(priv->tzd)) {
 		ret = PTR_ERR(priv->tzd);
 		dev_err(&pdev->dev, "failed to register sensor: %d\n", ret);
 		goto disable_clk_all;
 	}

 	if (priv->tzd->tzp->slope == 0) {
 		thermal_zone_of_sensor_unregister(&pdev->dev, priv->tzd);
 		dev_err(&pdev->dev, "coefficients of sensor is invalid\n");
 		ret = -EINVAL;
 		goto disable_clk_all;
 	}

 	priv->dev = &pdev->dev;
 	platform_set_drvdata(pdev, priv);

 	return 0;

 disable_clk_all:
 	clk_disable_unprepare(priv->clk_apb);
 disable_clk_topcrm:
 	clk_disable_unprepare(priv->clk_topcrm);
 	return ret;
 }

 static int zx2967_thermal_exit(struct platform_device *pdev)
 {
 	struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev);

 	thermal_zone_of_sensor_unregister(&pdev->dev, priv->tzd);
 	clk_disable_unprepare(priv->clk_topcrm);
 	clk_disable_unprepare(priv->clk_apb);

 	return 0;
 }

 static const struct of_device_id zx2967_thermal_id_table[] = {
 	{ .compatible = "zte,zx296718-thermal" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, zx2967_thermal_id_table);

 #ifdef CONFIG_PM_SLEEP
 static int zx2967_thermal_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev);

 	if (priv && priv->clk_topcrm)
 		clk_disable_unprepare(priv->clk_topcrm);

 	if (priv && priv->clk_apb)
 		clk_disable_unprepare(priv->clk_apb);

 	return 0;
 }

 static int zx2967_thermal_resume(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev);
 	int error;

 	error = clk_prepare_enable(priv->clk_topcrm);
 	if (error)
 		return error;

 	error = clk_prepare_enable(priv->clk_apb);
 	if (error) {
 		clk_disable_unprepare(priv->clk_topcrm);
 		return error;
 	}

 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(zx2967_thermal_pm_ops,
 			 zx2967_thermal_suspend, zx2967_thermal_resume);

 static struct platform_driver zx2967_thermal_driver = {
 	.probe = zx2967_thermal_probe,
 	.remove = zx2967_thermal_exit,
 	.driver = {
 		.name = "zx2967_thermal",
 		.of_match_table = zx2967_thermal_id_table,
 		.pm = &zx2967_thermal_pm_ops,
 	},
 };
 module_platform_driver(zx2967_thermal_driver);

 MODULE_AUTHOR("Baoyou Xie <baoyou.xie@linaro.org>");
 MODULE_DESCRIPTION("ZTE zx2967 thermal driver");
 MODULE_LICENSE("GPL v2");
	/*
	* ZTE's zx2967 family thermal sensor driver
	*
	* Copyright (C) 2017 ZTE Ltd.
	*
	* Author: Baoyou Xie <baoyou.xie@linaro.org>
	*
	* License terms: GNU General Public License (GPL) version 2
	*/

	#include <linux/clk.h>
	#include <linux/device.h>
	#include <linux/err.h>
	#include <linux/iopoll.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/thermal.h>

	/* Power Mode: 0->low 1->high */
	#define ZX2967_THERMAL_POWER_MODE 0
	#define ZX2967_POWER_MODE_LOW 0
	#define ZX2967_POWER_MODE_HIGH 1

	/* DCF Control Register */
	#define ZX2967_THERMAL_DCF 0x4
	#define ZX2967_DCF_EN BIT(1)
	#define ZX2967_DCF_FREEZE BIT(0)

	/* Selection Register */
	#define ZX2967_THERMAL_SEL 0x8

	/* Control Register */
	#define ZX2967_THERMAL_CTRL 0x10

	#define ZX2967_THERMAL_READY BIT(12)
	#define ZX2967_THERMAL_TEMP_MASK GENMASK(11, 0)
	#define ZX2967_THERMAL_ID_MASK 0x18
	#define ZX2967_THERMAL_ID 0x10

	#define ZX2967_GET_TEMP_TIMEOUT_US (100 * 1024)

	/**
	* struct zx2967_thermal_priv - zx2967 thermal sensor private structure
	* @tzd: struct thermal_zone_device where the sensor is registered
	* @lock: prevents read sensor in parallel
	* @clk_topcrm: topcrm clk structure
	* @clk_apb: apb clk structure
	* @regs: pointer to base address of the thermal sensor
	*/

	struct zx2967_thermal_priv {
	struct thermal_zone_device *tzd;
	struct mutex lock;
	struct clk *clk_topcrm;
	struct clk *clk_apb;
	void __iomem *regs;
	struct device *dev;
	};

	static int zx2967_thermal_get_temp(void data, int temp)
	{
	void __iomem *regs;
	struct zx2967_thermal_priv *priv = data;
	u32 val;
	int ret;

	if (!priv->tzd)
	return -EAGAIN;

	regs = priv->regs;
	mutex_lock(&priv->lock);
	writel_relaxed(ZX2967_POWER_MODE_LOW,
	regs + ZX2967_THERMAL_POWER_MODE);
	writel_relaxed(ZX2967_DCF_EN, regs + ZX2967_THERMAL_DCF);

	val = readl_relaxed(regs + ZX2967_THERMAL_SEL);
	val &= ~ZX2967_THERMAL_ID_MASK;
	val \|= ZX2967_THERMAL_ID;
	writel_relaxed(val, regs + ZX2967_THERMAL_SEL);

	/*
	* Must wait for a while, surely it's a bit odd.
	* otherwise temperature value we got has a few deviation, even if
	* the THERMAL_READY bit is set.
	*/
	usleep_range(100, 300);
	ret = readx_poll_timeout(readl, regs + ZX2967_THERMAL_CTRL,
	val, val & ZX2967_THERMAL_READY, 300,
	ZX2967_GET_TEMP_TIMEOUT_US);
	if (ret) {
	dev_err(priv->dev, "Thermal sensor data timeout\n");
	goto unlock;
	}

	writel_relaxed(ZX2967_DCF_FREEZE \| ZX2967_DCF_EN,
	regs + ZX2967_THERMAL_DCF);
	val = readl_relaxed(regs + ZX2967_THERMAL_CTRL)
	& ZX2967_THERMAL_TEMP_MASK;
	writel_relaxed(ZX2967_POWER_MODE_HIGH,
	regs + ZX2967_THERMAL_POWER_MODE);

	/*
	* Calculate temperature
	* In dts, slope is multiplied by 1000.
	*/
	temp = DIV_ROUND_CLOSEST(((s32)val + priv->tzd->tzp->offset) 1000,
	priv->tzd->tzp->slope);

	unlock:
	mutex_unlock(&priv->lock);
	return ret;
	}

	static struct thermal_zone_of_device_ops zx2967_of_thermal_ops = {
	.get_temp = zx2967_thermal_get_temp,
	};

	static int zx2967_thermal_probe(struct platform_device *pdev)
	{
	struct zx2967_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->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(priv->regs))
	return PTR_ERR(priv->regs);

	priv->clk_topcrm = devm_clk_get(&pdev->dev, "topcrm");
	if (IS_ERR(priv->clk_topcrm)) {
	ret = PTR_ERR(priv->clk_topcrm);
	dev_err(&pdev->dev, "failed to get topcrm clock: %d\n", ret);
	return ret;
	}

	ret = clk_prepare_enable(priv->clk_topcrm);
	if (ret) {
	dev_err(&pdev->dev, "failed to enable topcrm clock: %d\n",
	ret);
	return ret;
	}

	priv->clk_apb = devm_clk_get(&pdev->dev, "apb");
	if (IS_ERR(priv->clk_apb)) {
	ret = PTR_ERR(priv->clk_apb);
	dev_err(&pdev->dev, "failed to get apb clock: %d\n", ret);
	goto disable_clk_topcrm;
	}

	ret = clk_prepare_enable(priv->clk_apb);
	if (ret) {
	dev_err(&pdev->dev, "failed to enable apb clock: %d\n",
	ret);
	goto disable_clk_topcrm;
	}

	mutex_init(&priv->lock);
	priv->tzd = thermal_zone_of_sensor_register(&pdev->dev,
	0, priv, &zx2967_of_thermal_ops);

	if (IS_ERR(priv->tzd)) {
	ret = PTR_ERR(priv->tzd);
	dev_err(&pdev->dev, "failed to register sensor: %d\n", ret);
	goto disable_clk_all;
	}

	if (priv->tzd->tzp->slope == 0) {
	thermal_zone_of_sensor_unregister(&pdev->dev, priv->tzd);
	dev_err(&pdev->dev, "coefficients of sensor is invalid\n");
	ret = -EINVAL;
	goto disable_clk_all;
	}

	priv->dev = &pdev->dev;
	platform_set_drvdata(pdev, priv);

	return 0;

	disable_clk_all:
	clk_disable_unprepare(priv->clk_apb);
	disable_clk_topcrm:
	clk_disable_unprepare(priv->clk_topcrm);
	return ret;
	}

	static int zx2967_thermal_exit(struct platform_device *pdev)
	{
	struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev);

	thermal_zone_of_sensor_unregister(&pdev->dev, priv->tzd);
	clk_disable_unprepare(priv->clk_topcrm);
	clk_disable_unprepare(priv->clk_apb);

	return 0;
	}

	static const struct of_device_id zx2967_thermal_id_table[] = {
	{ .compatible = "zte,zx296718-thermal" },
	{}
	};
	MODULE_DEVICE_TABLE(of, zx2967_thermal_id_table);

	#ifdef CONFIG_PM_SLEEP
	static int zx2967_thermal_suspend(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev);

	if (priv && priv->clk_topcrm)
	clk_disable_unprepare(priv->clk_topcrm);

	if (priv && priv->clk_apb)
	clk_disable_unprepare(priv->clk_apb);

	return 0;
	}

	static int zx2967_thermal_resume(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev);
	int error;

	error = clk_prepare_enable(priv->clk_topcrm);
	if (error)
	return error;

	error = clk_prepare_enable(priv->clk_apb);
	if (error) {
	clk_disable_unprepare(priv->clk_topcrm);
	return error;
	}

	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(zx2967_thermal_pm_ops,
	zx2967_thermal_suspend, zx2967_thermal_resume);

	static struct platform_driver zx2967_thermal_driver = {
	.probe = zx2967_thermal_probe,
	.remove = zx2967_thermal_exit,
	.driver = {
	.name = "zx2967_thermal",
	.of_match_table = zx2967_thermal_id_table,
	.pm = &zx2967_thermal_pm_ops,
	},
	};
	module_platform_driver(zx2967_thermal_driver);

	MODULE_AUTHOR("Baoyou Xie <baoyou.xie@linaro.org>");
	MODULE_DESCRIPTION("ZTE zx2967 thermal driver");
	MODULE_LICENSE("GPL v2");