Commit 6219929f authored by Laxman Dewangan's avatar Laxman Dewangan Committed by Mark Brown
Browse files

regulator: TPS62360: Add tps62360 regulator driver 



The regulator module consists of 1 DCDC. The output voltage
is configurable and is meant for supply power to the core
voltage of Soc.

Signed-off-by: default avatarLaxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent dcd6c922

drivers/regulator/Kconfig

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@@ -328,6 +328,16 @@ config REGULATOR_TPS65910 
	help

	  This driver supports TPS65910 voltage regulator chips.



config REGULATOR_TPS62360

	tristate "TI TPS62360 Power Regulator"

	depends on I2C

	select REGMAP_I2C

	help

	  This driver supports TPS62360 voltage regulator chip. This

	  regulator is meant for processor core supply. This chip is

	  high-frequency synchronous step down dc-dc converter optimized

	  for battery-powered portable applications.



config REGULATOR_AAT2870

	tristate "AnalogicTech AAT2870 Regulators"

	depends on MFD_AAT2870_CORE

drivers/regulator/Makefile

+1 −0
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@@ -47,6 +47,7 @@ obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o 
obj-$(CONFIG_REGULATOR_AB8500)	+= ab8500.o

obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o

obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o

obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o

obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o



ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG

drivers/regulator/tps62360-regulator.c

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Original line number Diff line number Diff line 
/*

 * tps62360.c -- TI tps62360

 *

 * Driver for processor core supply tps62360 and tps62361B

 *

 * Copyright (c) 2012, NVIDIA Corporation.

 *

 * Author: Laxman Dewangan <ldewangan@nvidia.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation version 2.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,

 * whether express or implied; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

 * 02111-1307, USA

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/err.h>

#include <linux/platform_device.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/machine.h>

#include <linux/regulator/tps62360.h>

#include <linux/gpio.h>

#include <linux/i2c.h>

#include <linux/delay.h>

#include <linux/slab.h>

#include <linux/regmap.h>



/* Register definitions */

#define REG_VSET0		0

#define REG_VSET1		1

#define REG_VSET2		2

#define REG_VSET3		3

#define REG_CONTROL		4

#define REG_TEMP		5

#define REG_RAMPCTRL		6

#define REG_CHIPID		8



enum chips {TPS62360, TPS62361};



#define TPS62360_BASE_VOLTAGE	770

#define TPS62360_N_VOLTAGES	64



#define TPS62361_BASE_VOLTAGE	500

#define TPS62361_N_VOLTAGES	128



/* tps 62360 chip information */

struct tps62360_chip {

	const char *name;

	struct device *dev;

	struct regulator_desc desc;

	struct i2c_client *client;

	struct regulator_dev *rdev;

	struct regmap *regmap;

	int chip_id;

	int vsel0_gpio;

	int vsel1_gpio;

	int voltage_base;

	u8 voltage_reg_mask;

	bool en_internal_pulldn;

	bool en_force_pwm;

	bool en_discharge;

	bool valid_gpios;

	int lru_index[4];

	int curr_vset_vsel[4];

	int curr_vset_id;

};



/*

 * find_voltage_set_register: Find new voltage configuration register

 * (VSET) id.

 * The finding of the new VSET register will be based on the LRU mechanism.

 * Each VSET register will have different voltage configured . This

 * Function will look if any of the VSET register have requested voltage set

 * or not.

 *     - If it is already there then it will make that register as most

 *       recently used and return as found so that caller need not to set

 *       the VSET register but need to set the proper gpios to select this

 *       VSET register.

 *     - If requested voltage is not found then it will use the least

 *       recently mechanism to get new VSET register for new configuration

 *       and will return not_found so that caller need to set new VSET

 *       register and then gpios (both).

 */

static bool find_voltage_set_register(struct tps62360_chip *tps,

		int req_vsel, int *vset_reg_id)

{

	int i;

	bool found = false;

	int new_vset_reg = tps->lru_index[3];

	int found_index = 3;

	for (i = 0; i < 4; ++i) {

		if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {

			new_vset_reg = tps->lru_index[i];

			found_index = i;

			found = true;

			goto update_lru_index;

		}

	}



update_lru_index:

	for (i = found_index; i > 0; i--)

		tps->lru_index[i] = tps->lru_index[i - 1];



	tps->lru_index[0] = new_vset_reg;

	*vset_reg_id = new_vset_reg;

	return found;

}



static int tps62360_dcdc_get_voltage(struct regulator_dev *dev)

{

	struct tps62360_chip *tps = rdev_get_drvdata(dev);

	int vsel;

	unsigned int data;

	int ret;



	ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);

	if (ret < 0) {

		dev_err(tps->dev, "%s: Error in reading register %d\n",

			__func__, REG_VSET0 + tps->curr_vset_id);

		return ret;

	}

	vsel = (int)data & tps->voltage_reg_mask;

	return (tps->voltage_base + vsel * 10) * 1000;

}



static int tps62360_dcdc_set_voltage(struct regulator_dev *dev,

	     int min_uV, int max_uV, unsigned *selector)

{

	struct tps62360_chip *tps = rdev_get_drvdata(dev);

	int vsel;

	int ret;

	bool found = false;

	int new_vset_id = tps->curr_vset_id;



	if (max_uV < min_uV)

		return -EINVAL;



	if (min_uV >

		((tps->voltage_base + (tps->desc.n_voltages - 1) * 10) * 1000))

		return -EINVAL;



	if (max_uV < tps->voltage_base * 1000)

		return -EINVAL;



	vsel = DIV_ROUND_UP(min_uV - (tps->voltage_base * 1000), 10000);

	if (selector)

		*selector = (vsel & tps->voltage_reg_mask);



	/*

	 * If gpios are available to select the VSET register then least

	 * recently used register for new configuration.

	 */

	if (tps->valid_gpios)

		found = find_voltage_set_register(tps, vsel, &new_vset_id);



	if (!found) {

		ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,

				tps->voltage_reg_mask, vsel);

		if (ret < 0) {

			dev_err(tps->dev, "%s: Error in updating register %d\n",

				 __func__, REG_VSET0 + new_vset_id);

			return ret;

		}

		tps->curr_vset_id = new_vset_id;

		tps->curr_vset_vsel[new_vset_id] = vsel;

	}



	/* Select proper VSET register vio gpios */

	if (tps->valid_gpios) {

		gpio_set_value_cansleep(tps->vsel0_gpio,

					new_vset_id & 0x1);

		gpio_set_value_cansleep(tps->vsel1_gpio,

					(new_vset_id >> 1) & 0x1);

	}

	return 0;

}



static int tps62360_dcdc_list_voltage(struct regulator_dev *dev,

					unsigned selector)

{

	struct tps62360_chip *tps = rdev_get_drvdata(dev);



	if ((selector < 0) || (selector >= tps->desc.n_voltages))

		return -EINVAL;

	return (tps->voltage_base + selector * 10) * 1000;

}



static struct regulator_ops tps62360_dcdc_ops = {

	.get_voltage = tps62360_dcdc_get_voltage,

	.set_voltage = tps62360_dcdc_set_voltage,

	.list_voltage = tps62360_dcdc_list_voltage,

};



static int tps62360_init_force_pwm(struct tps62360_chip *tps,

	struct tps62360_regulator_platform_data *pdata,

	int vset_id)

{

	unsigned int data;

	int ret;

	ret = regmap_read(tps->regmap, REG_VSET0 + vset_id, &data);

	if (ret < 0) {

		dev_err(tps->dev, "%s() fails in writing reg %d\n",

			__func__, REG_VSET0 + vset_id);

		return ret;

	}

	tps->curr_vset_vsel[vset_id] = data & tps->voltage_reg_mask;

	if (pdata->en_force_pwm)

		data |= BIT(7);

	else

		data &= ~BIT(7);

	ret = regmap_write(tps->regmap, REG_VSET0 + vset_id, data);

	if (ret < 0)

		dev_err(tps->dev, "%s() fails in writing reg %d\n",

				__func__, REG_VSET0 + vset_id);

	return ret;

}



static int tps62360_init_dcdc(struct tps62360_chip *tps,

		struct tps62360_regulator_platform_data *pdata)

{

	int ret;

	int i;



	/* Initailize internal pull up/down control */

	if (tps->en_internal_pulldn)

		ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);

	else

		ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);

	if (ret < 0) {

		dev_err(tps->dev, "%s() fails in writing reg %d\n",

			__func__, REG_CONTROL);

		return ret;

	}



	/* Initailize force PWM mode */

	if (tps->valid_gpios) {

		for (i = 0; i < 4; ++i) {

			ret = tps62360_init_force_pwm(tps, pdata, i);

			if (ret < 0)

				return ret;

		}

	} else {

		ret = tps62360_init_force_pwm(tps, pdata, tps->curr_vset_id);

		if (ret < 0)

			return ret;

	}



	/* Reset output discharge path to reduce power consumption */

	ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);

	if (ret < 0)

		dev_err(tps->dev, "%s() fails in updating reg %d\n",

			__func__, REG_RAMPCTRL);

	return ret;

}



static const struct regmap_config tps62360_regmap_config = {

	.reg_bits = 8,

	.val_bits = 8,

};



static int __devinit tps62360_probe(struct i2c_client *client,

				     const struct i2c_device_id *id)

{

	struct tps62360_regulator_platform_data *pdata;

	struct regulator_dev *rdev;

	struct tps62360_chip *tps;

	int ret;

	int i;



	pdata = client->dev.platform_data;

	if (!pdata) {

		dev_err(&client->dev, "%s() Err: Platform data not found\n",

						__func__);

		return -EIO;

	}



	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);

	if (!tps) {

		dev_err(&client->dev, "%s() Err: Memory allocation fails\n",

						__func__);

		return -ENOMEM;

	}



	tps->en_force_pwm = pdata->en_force_pwm;

	tps->en_discharge = pdata->en_discharge;

	tps->en_internal_pulldn = pdata->en_internal_pulldn;

	tps->vsel0_gpio = pdata->vsel0_gpio;

	tps->vsel1_gpio = pdata->vsel1_gpio;

	tps->client = client;

	tps->dev = &client->dev;

	tps->name = id->name;

	tps->voltage_base = (id->driver_data == TPS62360) ?

				TPS62360_BASE_VOLTAGE : TPS62361_BASE_VOLTAGE;

	tps->voltage_reg_mask = (id->driver_data == TPS62360) ? 0x3F : 0x7F;



	tps->desc.name = id->name;

	tps->desc.id = 0;

	tps->desc.n_voltages = (id->driver_data == TPS62360) ?

				TPS62360_N_VOLTAGES : TPS62361_N_VOLTAGES;

	tps->desc.ops = &tps62360_dcdc_ops;

	tps->desc.type = REGULATOR_VOLTAGE;

	tps->desc.owner = THIS_MODULE;

	tps->regmap = regmap_init_i2c(client, &tps62360_regmap_config);

	if (IS_ERR(tps->regmap)) {

		ret = PTR_ERR(tps->regmap);

		dev_err(&client->dev, "%s() Err: Failed to allocate register"

			"map: %d\n", __func__, ret);

		return ret;

	}

	i2c_set_clientdata(client, tps);



	tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +

				(pdata->vsel0_def_state & 1);

	tps->lru_index[0] = tps->curr_vset_id;

	tps->valid_gpios = false;



	if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) {

		ret = gpio_request(tps->vsel0_gpio, "tps62360-vsel0");

		if (ret) {

			dev_err(&client->dev,

				"Err: Could not obtain vsel0 GPIO %d: %d\n",

						tps->vsel0_gpio, ret);

			goto err_gpio0;

		}

		ret = gpio_direction_output(tps->vsel0_gpio,

					pdata->vsel0_def_state);

		if (ret) {

			dev_err(&client->dev, "Err: Could not set direction of"

				"vsel0 GPIO %d: %d\n", tps->vsel0_gpio, ret);

			gpio_free(tps->vsel0_gpio);

			goto err_gpio0;

		}



		ret = gpio_request(tps->vsel1_gpio, "tps62360-vsel1");

		if (ret) {

			dev_err(&client->dev,

				"Err: Could not obtain vsel1 GPIO %d: %d\n",

						tps->vsel1_gpio, ret);

			goto err_gpio1;

		}

		ret = gpio_direction_output(tps->vsel1_gpio,

					pdata->vsel1_def_state);

		if (ret) {

			dev_err(&client->dev, "Err: Could not set direction of"

				"vsel1 GPIO %d: %d\n", tps->vsel1_gpio, ret);

			gpio_free(tps->vsel1_gpio);

			goto err_gpio1;

		}

		tps->valid_gpios = true;



		/*

		 * Initialize the lru index with vset_reg id

		 * The index 0 will be most recently used and

		 * set with the tps->curr_vset_id */

		for (i = 0; i < 4; ++i)

			tps->lru_index[i] = i;

		tps->lru_index[0] = tps->curr_vset_id;

		tps->lru_index[tps->curr_vset_id] = 0;

	}



	ret = tps62360_init_dcdc(tps, pdata);

	if (ret < 0) {

		dev_err(tps->dev, "%s() Err: Init fails with = %d\n",

				__func__, ret);

		goto err_init;

	}



	/* Register the regulators */

	rdev = regulator_register(&tps->desc, &client->dev,

				&pdata->reg_init_data, tps, NULL);

	if (IS_ERR(rdev)) {

		dev_err(tps->dev, "%s() Err: Failed to register %s\n",

				__func__, id->name);

		ret = PTR_ERR(rdev);

		goto err_init;

	}



	tps->rdev = rdev;

	return 0;



err_init:

	if (gpio_is_valid(tps->vsel1_gpio))

		gpio_free(tps->vsel1_gpio);

err_gpio1:

	if (gpio_is_valid(tps->vsel0_gpio))

		gpio_free(tps->vsel0_gpio);

err_gpio0:

	regmap_exit(tps->regmap);

	return ret;

}



/**

 * tps62360_remove - tps62360 driver i2c remove handler

 * @client: i2c driver client device structure

 *

 * Unregister TPS driver as an i2c client device driver

 */

static int __devexit tps62360_remove(struct i2c_client *client)

{

	struct tps62360_chip *tps = i2c_get_clientdata(client);



	if (gpio_is_valid(tps->vsel1_gpio))

		gpio_free(tps->vsel1_gpio);



	if (gpio_is_valid(tps->vsel0_gpio))

		gpio_free(tps->vsel0_gpio);



	regulator_unregister(tps->rdev);

	regmap_exit(tps->regmap);

	return 0;

}



static void tps62360_shutdown(struct i2c_client *client)

{

	struct tps62360_chip *tps = i2c_get_clientdata(client);

	int st;



	if (!tps->en_discharge)

		return;



	/* Configure the output discharge path */

	st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));

	if (st < 0)

		dev_err(tps->dev, "%s() fails in updating reg %d\n",

			__func__, REG_RAMPCTRL);

}



static const struct i2c_device_id tps62360_id[] = {

	{.name = "tps62360", .driver_data = TPS62360},

	{.name = "tps62361", .driver_data = TPS62361},

	{},

};



MODULE_DEVICE_TABLE(i2c, tps62360_id);



static struct i2c_driver tps62360_i2c_driver = {

	.driver = {

		.name = "tps62360",

		.owner = THIS_MODULE,

	},

	.probe = tps62360_probe,

	.remove = __devexit_p(tps62360_remove),

	.shutdown = tps62360_shutdown,

	.id_table = tps62360_id,

};



static int __init tps62360_init(void)

{

	return i2c_add_driver(&tps62360_i2c_driver);

}

subsys_initcall(tps62360_init);



static void __exit tps62360_cleanup(void)

{

	i2c_del_driver(&tps62360_i2c_driver);

}

module_exit(tps62360_cleanup);



MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");

MODULE_DESCRIPTION("TPS62360 voltage regulator driver");

MODULE_LICENSE("GPL v2");

include/linux/regulator/tps62360.h

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Original line number Diff line number Diff line 
/*

 * tps62360.h -- TI tps62360

 *

 * Interface for regulator driver for TI TPS62360 Processor core supply

 *

 * Copyright (C) 2012 NVIDIA Corporation



 * Author: Laxman Dewangan <ldewangan@nvidia.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * 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.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA	02110-1301, USA.

 *

 */



#ifndef __LINUX_REGULATOR_TPS62360_H

#define __LINUX_REGULATOR_TPS62360_H



#include <linux/regulator/machine.h>



/*

 * struct tps62360_regulator_platform_data - tps62360 regulator platform data.

 *

 * @reg_init_data: The regulator init data.

 * @en_force_pwm: Enable force pwm or not.

 * @en_discharge: Enable discharge the output capacitor via internal

 *                register.

 * @en_internal_pulldn: internal pull down enable or not.

 * @vsel0_gpio: Gpio number for vsel0. It should be -1 if this is tied with

 *              fixed logic.

 * @vsel1_gpio: Gpio number for vsel1. It should be -1 if this is tied with

 *              fixed logic.

 * @vsel0_def_state: Default state of vsel0. 1 if it is high else 0.

 * @vsel1_def_state: Default state of vsel1. 1 if it is high else 0.

 */

struct tps62360_regulator_platform_data {

	struct regulator_init_data reg_init_data;

	bool en_force_pwm;

	bool en_discharge;

	bool en_internal_pulldn;

	int vsel0_gpio;

	int vsel1_gpio;

	int vsel0_def_state;

	int vsel1_def_state;

};



#endif /* __LINUX_REGULATOR_TPS62360_H */

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