drivers/thermal/armada_thermal.c - third_party/linux - Git at Google

 /*
  * Marvell Armada 370/XP thermal sensor driver
  *
  * Copyright (C) 2013 Marvell
  *
  * 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/delay.h>
 #include <linux/platform_device.h>
 #include <linux/of_device.h>
 #include <linux/thermal.h>

 #define THERMAL_VALID_MASK		0x1

 /* Thermal Manager Control and Status Register */
 #define PMU_TDC0_SW_RST_MASK		(0x1 << 1)
 #define PMU_TM_DISABLE_OFFS		0
 #define PMU_TM_DISABLE_MASK		(0x1 << PMU_TM_DISABLE_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_OTF_CAL_MASK		(0x1 << 30)
 #define PMU_TDC0_START_CAL_MASK		(0x1 << 25)

 #define A375_UNIT_CONTROL_SHIFT		27
 #define A375_UNIT_CONTROL_MASK		0x7
 #define A375_READOUT_INVERT		BIT(15)
 #define A375_HW_RESETn			BIT(8)
 #define A380_HW_RESET			BIT(8)

 struct armada_thermal_data;

 /* Marvell EBU Thermal Sensor Dev Structure */
 struct armada_thermal_priv {
 	void __iomem *sensor;
 	void __iomem *control;
 	struct armada_thermal_data *data;
 };

 struct armada_thermal_data {
 	/* Initialize the sensor */
 	void (*init_sensor)(struct platform_device *pdev,
 			    struct armada_thermal_priv *);

 	/* Test for a valid sensor value (optional) */
 	bool (*is_valid)(struct armada_thermal_priv *);

 	/* Formula coeficients: temp = (b + m * reg) / div */
 	unsigned long coef_b;
 	unsigned long coef_m;
 	unsigned long coef_div;
 	bool inverted;

 	/* Register shift and mask to access the sensor temperature */
 	unsigned int temp_shift;
 	unsigned int temp_mask;
 	unsigned int is_valid_shift;
 };

 static void armadaxp_init_sensor(struct platform_device *pdev,
 				 struct armada_thermal_priv *priv)
 {
 	unsigned long reg;

 	reg = readl_relaxed(priv->control);
 	reg |= PMU_TDC0_OTF_CAL_MASK;
 	writel(reg, priv->control);

 	/* Reference calibration value */
 	reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
 	reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_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);
 }

 static void armada370_init_sensor(struct platform_device *pdev,
 				  struct armada_thermal_priv *priv)
 {
 	unsigned long reg;

 	reg = readl_relaxed(priv->control);
 	reg |= PMU_TDC0_OTF_CAL_MASK;
 	writel(reg, priv->control);

 	/* Reference calibration value */
 	reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
 	reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
 	writel(reg, priv->control);

 	reg &= ~PMU_TDC0_START_CAL_MASK;
 	writel(reg, priv->control);

 	mdelay(10);
 }

 static void armada375_init_sensor(struct platform_device *pdev,
 				  struct armada_thermal_priv *priv)
 {
 	unsigned long reg;

 	reg = readl(priv->control + 4);
 	reg &= ~(A375_UNIT_CONTROL_MASK << A375_UNIT_CONTROL_SHIFT);
 	reg &= ~A375_READOUT_INVERT;
 	reg &= ~A375_HW_RESETn;

 	writel(reg, priv->control + 4);
 	mdelay(20);

 	reg |= A375_HW_RESETn;
 	writel(reg, priv->control + 4);
 	mdelay(50);
 }

 static void armada380_init_sensor(struct platform_device *pdev,
 				  struct armada_thermal_priv *priv)
 {
 	unsigned long reg = readl_relaxed(priv->control);

 	/* Reset hardware once */
 	if (!(reg & A380_HW_RESET)) {
 		reg |= A380_HW_RESET;
 		writel(reg, priv->control);
 		mdelay(10);
 	}
 }

 static bool armada_is_valid(struct armada_thermal_priv *priv)
 {
 	unsigned long reg = readl_relaxed(priv->sensor);

 	return (reg >> priv->data->is_valid_shift) & THERMAL_VALID_MASK;
 }

 static int armada_get_temp(struct thermal_zone_device *thermal,
 			  unsigned long *temp)
 {
 	struct armada_thermal_priv *priv = thermal->devdata;
 	unsigned long reg;
 	unsigned long m, b, div;

 	/* Valid check */
 	if (priv->data->is_valid && !priv->data->is_valid(priv)) {
 		dev_err(&thermal->device,
 			"Temperature sensor reading not valid\n");
 		return -EIO;
 	}

 	reg = readl_relaxed(priv->sensor);
 	reg = (reg >> priv->data->temp_shift) & priv->data->temp_mask;

 	/* Get formula coeficients */
 	b = priv->data->coef_b;
 	m = priv->data->coef_m;
 	div = priv->data->coef_div;

 	if (priv->data->inverted)
 		*temp = ((m * reg) - b) / div;
 	else
 		*temp = (b - (m * reg)) / div;
 	return 0;
 }

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

 static const struct armada_thermal_data armadaxp_data = {
 	.init_sensor = armadaxp_init_sensor,
 	.temp_shift = 10,
 	.temp_mask = 0x1ff,
 	.coef_b = 3153000000UL,
 	.coef_m = 10000000UL,
 	.coef_div = 13825,
 };

 static const struct armada_thermal_data armada370_data = {
 	.is_valid = armada_is_valid,
 	.init_sensor = armada370_init_sensor,
 	.is_valid_shift = 9,
 	.temp_shift = 10,
 	.temp_mask = 0x1ff,
 	.coef_b = 3153000000UL,
 	.coef_m = 10000000UL,
 	.coef_div = 13825,
 };

 static const struct armada_thermal_data armada375_data = {
 	.is_valid = armada_is_valid,
 	.init_sensor = armada375_init_sensor,
 	.is_valid_shift = 10,
 	.temp_shift = 0,
 	.temp_mask = 0x1ff,
 	.coef_b = 3171900000UL,
 	.coef_m = 10000000UL,
 	.coef_div = 13616,
 };

 static const struct armada_thermal_data armada380_data = {
 	.is_valid = armada_is_valid,
 	.init_sensor = armada380_init_sensor,
 	.is_valid_shift = 10,
 	.temp_shift = 0,
 	.temp_mask = 0x3ff,
 	.coef_b = 2931108200UL,
 	.coef_m = 5000000UL,
 	.coef_div = 10502,
 	.inverted = true,
 };

 static const struct of_device_id armada_thermal_id_table[] = {
 	{
 		.compatible = "marvell,armadaxp-thermal",
 		.data       = &armadaxp_data,
 	},
 	{
 		.compatible = "marvell,armada370-thermal",
 		.data       = &armada370_data,
 	},
 	{
 		.compatible = "marvell,armada375-thermal",
 		.data       = &armada375_data,
 	},
 	{
 		.compatible = "marvell,armada380-thermal",
 		.data       = &armada380_data,
 	},
 	{
 		/* sentinel */
 	},
 };
 MODULE_DEVICE_TABLE(of, armada_thermal_id_table);

 static int armada_thermal_probe(struct platform_device *pdev)
 {
 	struct thermal_zone_device *thermal;
 	const struct of_device_id *match;
 	struct armada_thermal_priv *priv;
 	struct resource *res;

 	match = of_match_device(armada_thermal_id_table, &pdev->dev);
 	if (!match)
 		return -ENODEV;

 	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);

 	priv->data = (struct armada_thermal_data *)match->data;
 	priv->data->init_sensor(pdev, priv);

 	thermal = thermal_zone_device_register("armada_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 armada_thermal_exit(struct platform_device *pdev)
 {
 	struct thermal_zone_device *armada_thermal =
 		platform_get_drvdata(pdev);

 	thermal_zone_device_unregister(armada_thermal);

 	return 0;
 }

 static struct platform_driver armada_thermal_driver = {
 	.probe = armada_thermal_probe,
 	.remove = armada_thermal_exit,
 	.driver = {
 		.name = "armada_thermal",
 		.of_match_table = armada_thermal_id_table,
 	},
 };

 module_platform_driver(armada_thermal_driver);

 MODULE_AUTHOR("Ezequiel Garcia <ezequiel.garcia@free-electrons.com>");
 MODULE_DESCRIPTION("Armada 370/XP thermal driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Marvell Armada 370/XP thermal sensor driver
	*
	* Copyright (C) 2013 Marvell
	*
	* 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/delay.h>
	#include <linux/platform_device.h>
	#include <linux/of_device.h>
	#include <linux/thermal.h>

	#define THERMAL_VALID_MASK 0x1

	/* Thermal Manager Control and Status Register */
	#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
	#define PMU_TM_DISABLE_OFFS 0
	#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_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_OTF_CAL_MASK (0x1 << 30)
	#define PMU_TDC0_START_CAL_MASK (0x1 << 25)

	#define A375_UNIT_CONTROL_SHIFT 27
	#define A375_UNIT_CONTROL_MASK 0x7
	#define A375_READOUT_INVERT BIT(15)
	#define A375_HW_RESETn BIT(8)
	#define A380_HW_RESET BIT(8)

	struct armada_thermal_data;

	/* Marvell EBU Thermal Sensor Dev Structure */
	struct armada_thermal_priv {
	void __iomem *sensor;
	void __iomem *control;
	struct armada_thermal_data *data;
	};

	struct armada_thermal_data {
	/* Initialize the sensor */
	void (init_sensor)(struct platform_device pdev,
	struct armada_thermal_priv *);

	/* Test for a valid sensor value (optional) */
	bool (is_valid)(struct armada_thermal_priv );

	/* Formula coeficients: temp = (b + m * reg) / div */
	unsigned long coef_b;
	unsigned long coef_m;
	unsigned long coef_div;
	bool inverted;

	/* Register shift and mask to access the sensor temperature */
	unsigned int temp_shift;
	unsigned int temp_mask;
	unsigned int is_valid_shift;
	};

	static void armadaxp_init_sensor(struct platform_device *pdev,
	struct armada_thermal_priv *priv)
	{
	unsigned long reg;

	reg = readl_relaxed(priv->control);
	reg \|= PMU_TDC0_OTF_CAL_MASK;
	writel(reg, priv->control);

	/* Reference calibration value */
	reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
	reg \|= (0xf1 << PMU_TDC0_REF_CAL_CNT_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);
	}

	static void armada370_init_sensor(struct platform_device *pdev,
	struct armada_thermal_priv *priv)
	{
	unsigned long reg;

	reg = readl_relaxed(priv->control);
	reg \|= PMU_TDC0_OTF_CAL_MASK;
	writel(reg, priv->control);

	/* Reference calibration value */
	reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
	reg \|= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
	writel(reg, priv->control);

	reg &= ~PMU_TDC0_START_CAL_MASK;
	writel(reg, priv->control);

	mdelay(10);
	}

	static void armada375_init_sensor(struct platform_device *pdev,
	struct armada_thermal_priv *priv)
	{
	unsigned long reg;

	reg = readl(priv->control + 4);
	reg &= ~(A375_UNIT_CONTROL_MASK << A375_UNIT_CONTROL_SHIFT);
	reg &= ~A375_READOUT_INVERT;
	reg &= ~A375_HW_RESETn;

	writel(reg, priv->control + 4);
	mdelay(20);

	reg \|= A375_HW_RESETn;
	writel(reg, priv->control + 4);
	mdelay(50);
	}

	static void armada380_init_sensor(struct platform_device *pdev,
	struct armada_thermal_priv *priv)
	{
	unsigned long reg = readl_relaxed(priv->control);

	/* Reset hardware once */
	if (!(reg & A380_HW_RESET)) {
	reg \|= A380_HW_RESET;
	writel(reg, priv->control);
	mdelay(10);
	}
	}

	static bool armada_is_valid(struct armada_thermal_priv *priv)
	{
	unsigned long reg = readl_relaxed(priv->sensor);

	return (reg >> priv->data->is_valid_shift) & THERMAL_VALID_MASK;
	}

	static int armada_get_temp(struct thermal_zone_device *thermal,
	unsigned long *temp)
	{
	struct armada_thermal_priv *priv = thermal->devdata;
	unsigned long reg;
	unsigned long m, b, div;

	/* Valid check */
	if (priv->data->is_valid && !priv->data->is_valid(priv)) {
	dev_err(&thermal->device,
	"Temperature sensor reading not valid\n");
	return -EIO;
	}

	reg = readl_relaxed(priv->sensor);
	reg = (reg >> priv->data->temp_shift) & priv->data->temp_mask;

	/* Get formula coeficients */
	b = priv->data->coef_b;
	m = priv->data->coef_m;
	div = priv->data->coef_div;

	if (priv->data->inverted)
	temp = ((m reg) - b) / div;
	else
	temp = (b - (m reg)) / div;
	return 0;
	}

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

	static const struct armada_thermal_data armadaxp_data = {
	.init_sensor = armadaxp_init_sensor,
	.temp_shift = 10,
	.temp_mask = 0x1ff,
	.coef_b = 3153000000UL,
	.coef_m = 10000000UL,
	.coef_div = 13825,
	};

	static const struct armada_thermal_data armada370_data = {
	.is_valid = armada_is_valid,
	.init_sensor = armada370_init_sensor,
	.is_valid_shift = 9,
	.temp_shift = 10,
	.temp_mask = 0x1ff,
	.coef_b = 3153000000UL,
	.coef_m = 10000000UL,
	.coef_div = 13825,
	};

	static const struct armada_thermal_data armada375_data = {
	.is_valid = armada_is_valid,
	.init_sensor = armada375_init_sensor,
	.is_valid_shift = 10,
	.temp_shift = 0,
	.temp_mask = 0x1ff,
	.coef_b = 3171900000UL,
	.coef_m = 10000000UL,
	.coef_div = 13616,
	};

	static const struct armada_thermal_data armada380_data = {
	.is_valid = armada_is_valid,
	.init_sensor = armada380_init_sensor,
	.is_valid_shift = 10,
	.temp_shift = 0,
	.temp_mask = 0x3ff,
	.coef_b = 2931108200UL,
	.coef_m = 5000000UL,
	.coef_div = 10502,
	.inverted = true,
	};

	static const struct of_device_id armada_thermal_id_table[] = {
	{
	.compatible = "marvell,armadaxp-thermal",
	.data = &armadaxp_data,
	},
	{
	.compatible = "marvell,armada370-thermal",
	.data = &armada370_data,
	},
	{
	.compatible = "marvell,armada375-thermal",
	.data = &armada375_data,
	},
	{
	.compatible = "marvell,armada380-thermal",
	.data = &armada380_data,
	},
	{
	/* sentinel */
	},
	};
	MODULE_DEVICE_TABLE(of, armada_thermal_id_table);

	static int armada_thermal_probe(struct platform_device *pdev)
	{
	struct thermal_zone_device *thermal;
	const struct of_device_id *match;
	struct armada_thermal_priv *priv;
	struct resource *res;

	match = of_match_device(armada_thermal_id_table, &pdev->dev);
	if (!match)
	return -ENODEV;

	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);

	priv->data = (struct armada_thermal_data *)match->data;
	priv->data->init_sensor(pdev, priv);

	thermal = thermal_zone_device_register("armada_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 armada_thermal_exit(struct platform_device *pdev)
	{
	struct thermal_zone_device *armada_thermal =
	platform_get_drvdata(pdev);

	thermal_zone_device_unregister(armada_thermal);

	return 0;
	}

	static struct platform_driver armada_thermal_driver = {
	.probe = armada_thermal_probe,
	.remove = armada_thermal_exit,
	.driver = {
	.name = "armada_thermal",
	.of_match_table = armada_thermal_id_table,
	},
	};

	module_platform_driver(armada_thermal_driver);

	MODULE_AUTHOR("Ezequiel Garcia <ezequiel.garcia@free-electrons.com>");
	MODULE_DESCRIPTION("Armada 370/XP thermal driver");
	MODULE_LICENSE("GPL v2");