/*
* 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");
