[deliverable/linux.git] / drivers / regulator / tps62360-regulator.c

/*
 * tps62360.c -- TI tps62360
 *
 * Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
 *
 * 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/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/regulator/of_regulator.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/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

#define FORCE_PWM_ENABLE	BIT(7)

enum chips {TPS62360, TPS62361, TPS62362, TPS62363};

#define TPS62360_BASE_VOLTAGE	770000
#define TPS62360_N_VOLTAGES	64

#define TPS62361_BASE_VOLTAGE	500000
#define TPS62361_N_VOLTAGES	128

/* tps 62360 chip information */
struct tps62360_chip {
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_dev *rdev;
	struct regmap *regmap;
	int vsel0_gpio;
	int vsel1_gpio;
	u8 voltage_reg_mask;
	bool en_internal_pulldn;
	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_sel(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(): register %d read failed with err %d\n",
			__func__, REG_VSET0 + tps->curr_vset_id, ret);
		return ret;
	}
	vsel = (int)data & tps->voltage_reg_mask;
	return vsel;
}

static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
					 unsigned selector)
{
	struct tps62360_chip *tps = rdev_get_drvdata(dev);
	int ret;
	bool found = false;
	int new_vset_id = tps->curr_vset_id;

	/*
	 * 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, selector, &new_vset_id);

	if (!found) {
		ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
				tps->voltage_reg_mask, selector);
		if (ret < 0) {
			dev_err(tps->dev,
				"%s(): register %d update failed with err %d\n",
				 __func__, REG_VSET0 + new_vset_id, ret);
			return ret;
		}
		tps->curr_vset_id = new_vset_id;
		tps->curr_vset_vsel[new_vset_id] = selector;
	}

	/* 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_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	int i;
	int val;
	int ret;

	/* Enable force PWM mode in FAST mode only. */
	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = FORCE_PWM_ENABLE;
		break;

	case REGULATOR_MODE_NORMAL:
		val = 0;
		break;

	default:
		return -EINVAL;
	}

	if (!tps->valid_gpios) {
		ret = regmap_update_bits(tps->regmap,
			REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
		if (ret < 0)
			dev_err(tps->dev,
				"%s(): register %d update failed with err %d\n",
				__func__, REG_VSET0 + tps->curr_vset_id, ret);
		return ret;
	}

	/* If gpios are valid then all register set need to be control */
	for (i = 0; i < 4; ++i) {
		ret = regmap_update_bits(tps->regmap,
					REG_VSET0 + i, FORCE_PWM_ENABLE, val);
		if (ret < 0) {
			dev_err(tps->dev,
				"%s(): register %d update failed with err %d\n",
				__func__, REG_VSET0 + i, ret);
			return ret;
		}
	}
	return ret;
}

static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
{
	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	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(): register %d read failed with err %d\n",
			__func__, REG_VSET0 + tps->curr_vset_id, ret);
		return ret;
	}
	return (data & FORCE_PWM_ENABLE) ?
				REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
}

static struct regulator_ops tps62360_dcdc_ops = {
	.get_voltage_sel	= tps62360_dcdc_get_voltage_sel,
	.set_voltage_sel	= tps62360_dcdc_set_voltage_sel,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
	.set_mode		= tps62360_set_mode,
	.get_mode		= tps62360_get_mode,
};

static int tps62360_init_dcdc(struct tps62360_chip *tps,
		struct tps62360_regulator_platform_data *pdata)
{
	int ret;
	unsigned int ramp_ctrl;

	/* Initialize 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(): register %d write failed with err %d\n",
			__func__, REG_CONTROL, ret);
		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(): register %d update failed with err %d\n",
			__func__, REG_RAMPCTRL, ret);
		return ret;
	}

	/* Get ramp value from ramp control register */
	ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
	if (ret < 0) {
		dev_err(tps->dev,
			"%s(): register %d read failed with err %d\n",
			__func__, REG_RAMPCTRL, ret);
		return ret;
	}
	ramp_ctrl = (ramp_ctrl >> 5) & 0x7;

	/* ramp mV/us = 32/(2^ramp_ctrl) */
	tps->desc.ramp_delay = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
	return ret;
}

static const struct regmap_config tps62360_regmap_config = {
	.reg_bits		= 8,
	.val_bits		= 8,
	.max_register		= REG_CHIPID,
	.cache_type		= REGCACHE_RBTREE,
};

static struct tps62360_regulator_platform_data *
	of_get_tps62360_platform_data(struct device *dev)
{
	struct tps62360_regulator_platform_data *pdata;
	struct device_node *np = dev->of_node;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return NULL;

	pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
	if (!pdata->reg_init_data) {
		dev_err(dev, "Not able to get OF regulator init data\n");
		return NULL;
	}

	pdata->vsel0_gpio = of_get_named_gpio(np, "vsel0-gpio", 0);
	pdata->vsel1_gpio = of_get_named_gpio(np, "vsel1-gpio", 0);

	if (of_find_property(np, "ti,vsel0-state-high", NULL))
		pdata->vsel0_def_state = 1;

	if (of_find_property(np, "ti,vsel1-state-high", NULL))
		pdata->vsel1_def_state = 1;

	if (of_find_property(np, "ti,enable-pull-down", NULL))
		pdata->en_internal_pulldn = true;

	if (of_find_property(np, "ti,enable-vout-discharge", NULL))
		pdata->en_discharge = true;

	return pdata;
}

#if defined(CONFIG_OF)
static const struct of_device_id tps62360_of_match[] = {
	 { .compatible = "ti,tps62360", .data = (void *)TPS62360},
	 { .compatible = "ti,tps62361", .data = (void *)TPS62361},
	 { .compatible = "ti,tps62362", .data = (void *)TPS62362},
	 { .compatible = "ti,tps62363", .data = (void *)TPS62363},
	{},
};
MODULE_DEVICE_TABLE(of, tps62360_of_match);
#endif

static int tps62360_probe(struct i2c_client *client,
				     const struct i2c_device_id *id)
{
	struct regulator_config config = { };
	struct tps62360_regulator_platform_data *pdata;
	struct regulator_dev *rdev;
	struct tps62360_chip *tps;
	int ret;
	int i;
	int chip_id;

	pdata = dev_get_platdata(&client->dev);

	if (client->dev.of_node) {
		const struct of_device_id *match;
		match = of_match_device(of_match_ptr(tps62360_of_match),
				&client->dev);
		if (!match) {
			dev_err(&client->dev, "Error: No device match found\n");
			return -ENODEV;
		}
		chip_id = (int)(long)match->data;
		if (!pdata)
			pdata = of_get_tps62360_platform_data(&client->dev);
	} else if (id) {
		chip_id = id->driver_data;
	} else {
		dev_err(&client->dev, "No device tree match or id table match found\n");
		return -ENODEV;
	}

	if (!pdata) {
		dev_err(&client->dev, "%s(): Platform data not found\n",
						__func__);
		return -EIO;
	}

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

	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->dev = &client->dev;

	switch (chip_id) {
	case TPS62360:
	case TPS62362:
		tps->desc.min_uV = TPS62360_BASE_VOLTAGE;
		tps->voltage_reg_mask = 0x3F;
		tps->desc.n_voltages = TPS62360_N_VOLTAGES;
		break;
	case TPS62361:
	case TPS62363:
		tps->desc.min_uV = TPS62361_BASE_VOLTAGE;
		tps->voltage_reg_mask = 0x7F;
		tps->desc.n_voltages = TPS62361_N_VOLTAGES;
		break;
	default:
		return -ENODEV;
	}

	tps->desc.name = client->name;
	tps->desc.id = 0;
	tps->desc.ops = &tps62360_dcdc_ops;
	tps->desc.type = REGULATOR_VOLTAGE;
	tps->desc.owner = THIS_MODULE;
	tps->desc.uV_step = 10000;

	tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
	if (IS_ERR(tps->regmap)) {
		ret = PTR_ERR(tps->regmap);
		dev_err(&client->dev,
			"%s(): regmap allocation failed with err %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)) {
		int gpio_flags;
		gpio_flags = (pdata->vsel0_def_state) ?
				GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
		ret = devm_gpio_request_one(&client->dev, tps->vsel0_gpio,
				gpio_flags, "tps62360-vsel0");
		if (ret) {
			dev_err(&client->dev,
				"%s(): Could not obtain vsel0 GPIO %d: %d\n",
				__func__, tps->vsel0_gpio, ret);
			return ret;
		}

		gpio_flags = (pdata->vsel1_def_state) ?
				GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
		ret = devm_gpio_request_one(&client->dev, tps->vsel1_gpio,
				gpio_flags, "tps62360-vsel1");
		if (ret) {
			dev_err(&client->dev,
				"%s(): Could not obtain vsel1 GPIO %d: %d\n",
				__func__, tps->vsel1_gpio, ret);
			return ret;
		}
		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(): Init failed with err = %d\n",
				__func__, ret);
		return ret;
	}

	config.dev = &client->dev;
	config.init_data = pdata->reg_init_data;
	config.driver_data = tps;
	config.of_node = client->dev.of_node;

	/* Register the regulators */
	rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
	if (IS_ERR(rdev)) {
		dev_err(tps->dev,
			"%s(): regulator register failed with err %s\n",
			__func__, id->name);
		return PTR_ERR(rdev);
	}

	tps->rdev = rdev;
	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(): register %d update failed with err %d\n",
			__func__, REG_RAMPCTRL, st);
}

static const struct i2c_device_id tps62360_id[] = {
	{.name = "tps62360", .driver_data = TPS62360},
	{.name = "tps62361", .driver_data = TPS62361},
	{.name = "tps62362", .driver_data = TPS62362},
	{.name = "tps62363", .driver_data = TPS62363},
	{},
};

MODULE_DEVICE_TABLE(i2c, tps62360_id);

static struct i2c_driver tps62360_i2c_driver = {
	.driver = {
		.name = "tps62360",
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(tps62360_of_match),
	},
	.probe = tps62360_probe,
	.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("TPS6236x voltage regulator driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
6219929f LD	1	/*
	2	* tps62360.c -- TI tps62360
	3	*
d1cf4f65	4	* Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
6219929f LD	5	*
	6	* Copyright (c) 2012, NVIDIA Corporation.
	7	*
	8	* Author: Laxman Dewangan <ldewangan@nvidia.com>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License as
	12	* published by the Free Software Foundation version 2.
	13	*
	14	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	15	* whether express or implied; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	22	* 02111-1307, USA
	23	*/
	24
	25	#include <linux/kernel.h>
	26	#include <linux/module.h>
	27	#include <linux/init.h>
	28	#include <linux/err.h>
684ae39b LD	29	#include <linux/of.h>
	30	#include <linux/of_device.h>
	31	#include <linux/of_gpio.h>
	32	#include <linux/regulator/of_regulator.h>
6219929f LD	33	#include <linux/platform_device.h>
	34	#include <linux/regulator/driver.h>
	35	#include <linux/regulator/machine.h>
	36	#include <linux/regulator/tps62360.h>
	37	#include <linux/gpio.h>
	38	#include <linux/i2c.h>
6219929f LD	39	#include <linux/slab.h>
	40	#include <linux/regmap.h>
	41
	42	/* Register definitions */
	43	#define REG_VSET0 0
	44	#define REG_VSET1 1
	45	#define REG_VSET2 2
	46	#define REG_VSET3 3
	47	#define REG_CONTROL 4
	48	#define REG_TEMP 5
	49	#define REG_RAMPCTRL 6
	50	#define REG_CHIPID 8
	51
9a00630c LD	52	#define FORCE_PWM_ENABLE BIT(7)
9a00630c LD	53
d1cf4f65	54	enum chips {TPS62360, TPS62361, TPS62362, TPS62363};
6219929f	55
2935fb18	56	#define TPS62360_BASE_VOLTAGE 770000
6219929f LD	57	#define TPS62360_N_VOLTAGES 64
6219929f LD	58
2935fb18	59	#define TPS62361_BASE_VOLTAGE 500000
6219929f LD	60	#define TPS62361_N_VOLTAGES 128
	61
	62	/* tps 62360 chip information */
	63	struct tps62360_chip {
6219929f LD	64	struct device *dev;
6219929f LD	65	struct regulator_desc desc;
6219929f LD	66	struct regulator_dev *rdev;
6219929f LD	67	struct regmap *regmap;
6219929f LD	68	int vsel0_gpio;
6219929f LD	69	int vsel1_gpio;
6219929f LD	70	u8 voltage_reg_mask;
6219929f LD	71	bool en_internal_pulldn;
6219929f LD	72	bool en_discharge;
	73	bool valid_gpios;
	74	int lru_index[4];
	75	int curr_vset_vsel[4];
	76	int curr_vset_id;
	77	};
	78
	79	/*
	80	* find_voltage_set_register: Find new voltage configuration register
	81	* (VSET) id.
	82	* The finding of the new VSET register will be based on the LRU mechanism.
	83	* Each VSET register will have different voltage configured . This
	84	* Function will look if any of the VSET register have requested voltage set
	85	* or not.
	86	* - If it is already there then it will make that register as most
	87	* recently used and return as found so that caller need not to set
	88	* the VSET register but need to set the proper gpios to select this
	89	* VSET register.
	90	* - If requested voltage is not found then it will use the least
	91	* recently mechanism to get new VSET register for new configuration
	92	* and will return not_found so that caller need to set new VSET
	93	* register and then gpios (both).
	94	*/
	95	static bool find_voltage_set_register(struct tps62360_chip *tps,
	96	int req_vsel, int *vset_reg_id)
	97	{
	98	int i;
	99	bool found = false;
	100	int new_vset_reg = tps->lru_index[3];
	101	int found_index = 3;
2935fb18	102
6219929f LD	103	for (i = 0; i < 4; ++i) {
	104	if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {
	105	new_vset_reg = tps->lru_index[i];
	106	found_index = i;
	107	found = true;
	108	goto update_lru_index;
	109	}
	110	}
	111
	112	update_lru_index:
	113	for (i = found_index; i > 0; i--)
	114	tps->lru_index[i] = tps->lru_index[i - 1];
	115
	116	tps->lru_index[0] = new_vset_reg;
	117	*vset_reg_id = new_vset_reg;
	118	return found;
	119	}
	120
a60cfce0	121	static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev)
6219929f LD	122	{
	123	struct tps62360_chip *tps = rdev_get_drvdata(dev);
	124	int vsel;
	125	unsigned int data;
	126	int ret;
	127
	128	ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
	129	if (ret < 0) {
2935fb18 LD	130	dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
2935fb18 LD	131	__func__, REG_VSET0 + tps->curr_vset_id, ret);
6219929f LD	132	return ret;
	133	}
	134	vsel = (int)data & tps->voltage_reg_mask;
a60cfce0	135	return vsel;
6219929f LD	136	}
6219929f LD	137
41097afd AL	138	static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
41097afd AL	139	unsigned selector)
6219929f LD	140	{
6219929f LD	141	struct tps62360_chip *tps = rdev_get_drvdata(dev);
6219929f LD	142	int ret;
	143	bool found = false;
	144	int new_vset_id = tps->curr_vset_id;
	145
6219929f LD	146	/*
	147	* If gpios are available to select the VSET register then least
	148	* recently used register for new configuration.
	149	*/
	150	if (tps->valid_gpios)
41097afd	151	found = find_voltage_set_register(tps, selector, &new_vset_id);
6219929f LD	152
	153	if (!found) {
	154	ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
41097afd	155	tps->voltage_reg_mask, selector);
6219929f	156	if (ret < 0) {
2935fb18 LD	157	dev_err(tps->dev,
	158	"%s(): register %d update failed with err %d\n",
	159	__func__, REG_VSET0 + new_vset_id, ret);
6219929f LD	160	return ret;
	161	}
	162	tps->curr_vset_id = new_vset_id;
41097afd	163	tps->curr_vset_vsel[new_vset_id] = selector;
6219929f LD	164	}
	165
	166	/* Select proper VSET register vio gpios */
	167	if (tps->valid_gpios) {
2935fb18	168	gpio_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1);
6219929f LD	169	gpio_set_value_cansleep(tps->vsel1_gpio,
	170	(new_vset_id >> 1) & 0x1);
	171	}
	172	return 0;
	173	}
	174
9a00630c LD	175	static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode)
	176	{
	177	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	178	int i;
	179	int val;
	180	int ret;
	181
	182	/* Enable force PWM mode in FAST mode only. */
	183	switch (mode) {
	184	case REGULATOR_MODE_FAST:
	185	val = FORCE_PWM_ENABLE;
	186	break;
	187
	188	case REGULATOR_MODE_NORMAL:
	189	val = 0;
	190	break;
	191
	192	default:
	193	return -EINVAL;
	194	}
	195
	196	if (!tps->valid_gpios) {
	197	ret = regmap_update_bits(tps->regmap,
	198	REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
	199	if (ret < 0)
	200	dev_err(tps->dev,
	201	"%s(): register %d update failed with err %d\n",
	202	__func__, REG_VSET0 + tps->curr_vset_id, ret);
	203	return ret;
	204	}
	205
	206	/* If gpios are valid then all register set need to be control */
	207	for (i = 0; i < 4; ++i) {
	208	ret = regmap_update_bits(tps->regmap,
	209	REG_VSET0 + i, FORCE_PWM_ENABLE, val);
	210	if (ret < 0) {
	211	dev_err(tps->dev,
	212	"%s(): register %d update failed with err %d\n",
	213	__func__, REG_VSET0 + i, ret);
	214	return ret;
	215	}
	216	}
	217	return ret;
	218	}
	219
	220	static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
	221	{
	222	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	223	unsigned int data;
	224	int ret;
	225
	226	ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
	227	if (ret < 0) {
	228	dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
	229	__func__, REG_VSET0 + tps->curr_vset_id, ret);
	230	return ret;
	231	}
	232	return (data & FORCE_PWM_ENABLE) ?
	233	REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
	234	}
	235
6219929f	236	static struct regulator_ops tps62360_dcdc_ops = {
a60cfce0	237	.get_voltage_sel = tps62360_dcdc_get_voltage_sel,
41097afd	238	.set_voltage_sel = tps62360_dcdc_set_voltage_sel,
7f225ba5	239	.list_voltage = regulator_list_voltage_linear,
41097afd	240	.map_voltage = regulator_map_voltage_linear,
0072f0a8	241	.set_voltage_time_sel = regulator_set_voltage_time_sel,
9a00630c LD	242	.set_mode = tps62360_set_mode,
9a00630c LD	243	.get_mode = tps62360_get_mode,
6219929f LD	244	};
6219929f LD	245
a5023574	246	static int tps62360_init_dcdc(struct tps62360_chip *tps,
6219929f LD	247	struct tps62360_regulator_platform_data *pdata)
	248	{
	249	int ret;
a60cfce0	250	unsigned int ramp_ctrl;
6219929f	251
2935fb18	252	/* Initialize internal pull up/down control */
6219929f LD	253	if (tps->en_internal_pulldn)
	254	ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
	255	else
	256	ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);
	257	if (ret < 0) {
2935fb18 LD	258	dev_err(tps->dev,
	259	"%s(): register %d write failed with err %d\n",
	260	__func__, REG_CONTROL, ret);
6219929f LD	261	return ret;
	262	}
	263
6219929f LD	264	/* Reset output discharge path to reduce power consumption */
6219929f LD	265	ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
a60cfce0	266	if (ret < 0) {
2935fb18 LD	267	dev_err(tps->dev,
	268	"%s(): register %d update failed with err %d\n",
	269	__func__, REG_RAMPCTRL, ret);
a60cfce0 LD	270	return ret;
	271	}
	272
	273	/* Get ramp value from ramp control register */
	274	ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
	275	if (ret < 0) {
2935fb18 LD	276	dev_err(tps->dev,
	277	"%s(): register %d read failed with err %d\n",
	278	__func__, REG_RAMPCTRL, ret);
a60cfce0 LD	279	return ret;
a60cfce0 LD	280	}
1864b670	281	ramp_ctrl = (ramp_ctrl >> 5) & 0x7;
a60cfce0 LD	282
a60cfce0 LD	283	/* ramp mV/us = 32/(2^ramp_ctrl) */
0072f0a8	284	tps->desc.ramp_delay = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
6219929f LD	285	return ret;
	286	}
	287
	288	static const struct regmap_config tps62360_regmap_config = {
16ea003b LD	289	.reg_bits = 8,
	290	.val_bits = 8,
	291	.max_register = REG_CHIPID,
	292	.cache_type = REGCACHE_RBTREE,
6219929f LD	293	};
6219929f LD	294
684ae39b LD	295	static struct tps62360_regulator_platform_data *
	296	of_get_tps62360_platform_data(struct device *dev)
	297	{
	298	struct tps62360_regulator_platform_data *pdata;
	299	struct device_node *np = dev->of_node;
	300
	301	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
33e63ba6	302	if (!pdata)
684ae39b	303	return NULL;
684ae39b LD	304
	305	pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
	306	if (!pdata->reg_init_data) {
	307	dev_err(dev, "Not able to get OF regulator init data\n");
	308	return NULL;
	309	}
	310
	311	pdata->vsel0_gpio = of_get_named_gpio(np, "vsel0-gpio", 0);
	312	pdata->vsel1_gpio = of_get_named_gpio(np, "vsel1-gpio", 0);
	313
	314	if (of_find_property(np, "ti,vsel0-state-high", NULL))
	315	pdata->vsel0_def_state = 1;
	316
	317	if (of_find_property(np, "ti,vsel1-state-high", NULL))
	318	pdata->vsel1_def_state = 1;
	319
	320	if (of_find_property(np, "ti,enable-pull-down", NULL))
	321	pdata->en_internal_pulldn = true;
	322
684ae39b LD	323	if (of_find_property(np, "ti,enable-vout-discharge", NULL))
	324	pdata->en_discharge = true;
	325
	326	return pdata;
	327	}
	328
	329	#if defined(CONFIG_OF)
	330	static const struct of_device_id tps62360_of_match[] = {
	331	{ .compatible = "ti,tps62360", .data = (void *)TPS62360},
	332	{ .compatible = "ti,tps62361", .data = (void *)TPS62361},
	333	{ .compatible = "ti,tps62362", .data = (void *)TPS62362},
	334	{ .compatible = "ti,tps62363", .data = (void *)TPS62363},
	335	{},
be15411d	336	};
684ae39b LD	337	MODULE_DEVICE_TABLE(of, tps62360_of_match);
	338	#endif
	339
a5023574	340	static int tps62360_probe(struct i2c_client *client,
6219929f LD	341	const struct i2c_device_id *id)
6219929f LD	342	{
c172708d	343	struct regulator_config config = { };
6219929f LD	344	struct tps62360_regulator_platform_data *pdata;
	345	struct regulator_dev *rdev;
	346	struct tps62360_chip *tps;
	347	int ret;
	348	int i;
684ae39b	349	int chip_id;
6219929f	350
dff91d0b	351	pdata = dev_get_platdata(&client->dev);
684ae39b LD	352
	353	if (client->dev.of_node) {
	354	const struct of_device_id *match;
	355	match = of_match_device(of_match_ptr(tps62360_of_match),
	356	&client->dev);
	357	if (!match) {
	358	dev_err(&client->dev, "Error: No device match found\n");
	359	return -ENODEV;
	360	}
541f597f	361	chip_id = (int)(long)match->data;
684ae39b LD	362	if (!pdata)
684ae39b LD	363	pdata = of_get_tps62360_platform_data(&client->dev);
0a62d03b TT	364	} else if (id) {
	365	chip_id = id->driver_data;
	366	} else {
	367	dev_err(&client->dev, "No device tree match or id table match found\n");
	368	return -ENODEV;
684ae39b LD	369	}
684ae39b LD	370
6219929f	371	if (!pdata) {
2935fb18	372	dev_err(&client->dev, "%s(): Platform data not found\n",
6219929f LD	373	__func__);
	374	return -EIO;
	375	}
	376
	377	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
33e63ba6	378	if (!tps)
6219929f	379	return -ENOMEM;
6219929f	380
6219929f LD	381	tps->en_discharge = pdata->en_discharge;
	382	tps->en_internal_pulldn = pdata->en_internal_pulldn;
	383	tps->vsel0_gpio = pdata->vsel0_gpio;
	384	tps->vsel1_gpio = pdata->vsel1_gpio;
6219929f	385	tps->dev = &client->dev;
d1cf4f65	386
684ae39b	387	switch (chip_id) {
d1cf4f65 AL	388	case TPS62360:
d1cf4f65 AL	389	case TPS62362:
b5152415	390	tps->desc.min_uV = TPS62360_BASE_VOLTAGE;
d1cf4f65 AL	391	tps->voltage_reg_mask = 0x3F;
	392	tps->desc.n_voltages = TPS62360_N_VOLTAGES;
	393	break;
	394	case TPS62361:
	395	case TPS62363:
b5152415	396	tps->desc.min_uV = TPS62361_BASE_VOLTAGE;
d1cf4f65 AL	397	tps->voltage_reg_mask = 0x7F;
	398	tps->desc.n_voltages = TPS62361_N_VOLTAGES;
	399	break;
	400	default:
	401	return -ENODEV;
	402	}
6219929f	403
0a62d03b	404	tps->desc.name = client->name;
6219929f	405	tps->desc.id = 0;
6219929f LD	406	tps->desc.ops = &tps62360_dcdc_ops;
	407	tps->desc.type = REGULATOR_VOLTAGE;
	408	tps->desc.owner = THIS_MODULE;
7f225ba5 AL	409	tps->desc.uV_step = 10000;
7f225ba5 AL	410
9a4bdd87	411	tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
6219929f LD	412	if (IS_ERR(tps->regmap)) {
6219929f LD	413	ret = PTR_ERR(tps->regmap);
2935fb18 LD	414	dev_err(&client->dev,
	415	"%s(): regmap allocation failed with err %d\n",
	416	__func__, ret);
6219929f LD	417	return ret;
	418	}
	419	i2c_set_clientdata(client, tps);
	420
	421	tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
	422	(pdata->vsel0_def_state & 1);
	423	tps->lru_index[0] = tps->curr_vset_id;
	424	tps->valid_gpios = false;
	425
	426	if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) {
2935fb18 LD	427	int gpio_flags;
	428	gpio_flags = (pdata->vsel0_def_state) ?
	429	GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
8a8e3d59	430	ret = devm_gpio_request_one(&client->dev, tps->vsel0_gpio,
2935fb18	431	gpio_flags, "tps62360-vsel0");
6219929f LD	432	if (ret) {
6219929f LD	433	dev_err(&client->dev,
2935fb18 LD	434	"%s(): Could not obtain vsel0 GPIO %d: %d\n",
2935fb18 LD	435	__func__, tps->vsel0_gpio, ret);
8a8e3d59	436	return ret;
6219929f LD	437	}
6219929f LD	438
2935fb18 LD	439	gpio_flags = (pdata->vsel1_def_state) ?
2935fb18 LD	440	GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
8a8e3d59	441	ret = devm_gpio_request_one(&client->dev, tps->vsel1_gpio,
2935fb18	442	gpio_flags, "tps62360-vsel1");
6219929f LD	443	if (ret) {
6219929f LD	444	dev_err(&client->dev,
2935fb18 LD	445	"%s(): Could not obtain vsel1 GPIO %d: %d\n",
2935fb18 LD	446	__func__, tps->vsel1_gpio, ret);
8a8e3d59	447	return ret;
6219929f LD	448	}
	449	tps->valid_gpios = true;
	450
	451	/*
	452	* Initialize the lru index with vset_reg id
	453	* The index 0 will be most recently used and
	454	* set with the tps->curr_vset_id */
	455	for (i = 0; i < 4; ++i)
	456	tps->lru_index[i] = i;
	457	tps->lru_index[0] = tps->curr_vset_id;
	458	tps->lru_index[tps->curr_vset_id] = 0;
	459	}
	460
	461	ret = tps62360_init_dcdc(tps, pdata);
	462	if (ret < 0) {
2935fb18	463	dev_err(tps->dev, "%s(): Init failed with err = %d\n",
6219929f	464	__func__, ret);
8a8e3d59	465	return ret;
6219929f LD	466	}
6219929f LD	467
c172708d	468	config.dev = &client->dev;
8bdca009	469	config.init_data = pdata->reg_init_data;
c172708d	470	config.driver_data = tps;
9fc3815e	471	config.of_node = client->dev.of_node;
c172708d	472
6219929f	473	/* Register the regulators */
58c6e938	474	rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
6219929f	475	if (IS_ERR(rdev)) {
2935fb18 LD	476	dev_err(tps->dev,
	477	"%s(): regulator register failed with err %s\n",
	478	__func__, id->name);
8a8e3d59	479	return PTR_ERR(rdev);
6219929f LD	480	}
	481
	482	tps->rdev = rdev;
	483	return 0;
6219929f LD	484	}
6219929f LD	485
6219929f LD	486	static void tps62360_shutdown(struct i2c_client *client)
	487	{
	488	struct tps62360_chip *tps = i2c_get_clientdata(client);
	489	int st;
	490
	491	if (!tps->en_discharge)
	492	return;
	493
	494	/* Configure the output discharge path */
	495	st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
	496	if (st < 0)
2935fb18 LD	497	dev_err(tps->dev,
	498	"%s(): register %d update failed with err %d\n",
	499	__func__, REG_RAMPCTRL, st);
6219929f LD	500	}
	501
	502	static const struct i2c_device_id tps62360_id[] = {
	503	{.name = "tps62360", .driver_data = TPS62360},
	504	{.name = "tps62361", .driver_data = TPS62361},
d1cf4f65 AL	505	{.name = "tps62362", .driver_data = TPS62362},
d1cf4f65 AL	506	{.name = "tps62363", .driver_data = TPS62363},
6219929f LD	507	{},
	508	};
	509
	510	MODULE_DEVICE_TABLE(i2c, tps62360_id);
	511
	512	static struct i2c_driver tps62360_i2c_driver = {
	513	.driver = {
	514	.name = "tps62360",
	515	.owner = THIS_MODULE,
684ae39b	516	.of_match_table = of_match_ptr(tps62360_of_match),
6219929f LD	517	},
6219929f LD	518	.probe = tps62360_probe,
6219929f LD	519	.shutdown = tps62360_shutdown,
	520	.id_table = tps62360_id,
	521	};
	522
	523	static int __init tps62360_init(void)
	524	{
	525	return i2c_add_driver(&tps62360_i2c_driver);
	526	}
	527	subsys_initcall(tps62360_init);
	528
	529	static void __exit tps62360_cleanup(void)
	530	{
	531	i2c_del_driver(&tps62360_i2c_driver);
	532	}
	533	module_exit(tps62360_cleanup);
	534
	535	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
d1cf4f65	536	MODULE_DESCRIPTION("TPS6236x voltage regulator driver");
6219929f	537	MODULE_LICENSE("GPL v2");