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kernel-fxtec-pro1x/drivers/regulator/tps51632-regulator.c

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/*
* tps51632-regulator.c -- TI TPS51632
*
* Regulator driver for TPS51632 3-2-1 Phase D-Cap Step Down Driverless
* Controller with serial VID control and DVFS.
*
* 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/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/tps51632-regulator.h>
#include <linux/slab.h>
/* Register definitions */
#define TPS51632_VOLTAGE_SELECT_REG 0x0
#define TPS51632_VOLTAGE_BASE_REG 0x1
#define TPS51632_OFFSET_REG 0x2
#define TPS51632_IMON_REG 0x3
#define TPS51632_VMAX_REG 0x4
#define TPS51632_DVFS_CONTROL_REG 0x5
#define TPS51632_POWER_STATE_REG 0x6
#define TPS51632_SLEW_REGS 0x7
#define TPS51632_FAULT_REG 0x14
#define TPS51632_MAX_REG 0x15
#define TPS51632_VOUT_MASK 0x7F
#define TPS51632_VOUT_OFFSET_MASK 0x1F
#define TPS51632_VMAX_MASK 0x7F
#define TPS51632_VMAX_LOCK 0x80
/* TPS51632_DVFS_CONTROL_REG */
#define TPS51632_DVFS_PWMEN 0x1
#define TPS51632_DVFS_STEP_20 0x2
#define TPS51632_DVFS_VMAX_PG 0x4
#define TPS51632_DVFS_PWMRST 0x8
#define TPS51632_DVFS_OCA_EN 0x10
#define TPS51632_DVFS_FCCM 0x20
/* TPS51632_POWER_STATE_REG */
#define TPS51632_POWER_STATE_MASK 0x03
#define TPS51632_POWER_STATE_MULTI_PHASE_CCM 0x0
#define TPS51632_POWER_STATE_SINGLE_PHASE_CCM 0x1
#define TPS51632_POWER_STATE_SINGLE_PHASE_DCM 0x2
#define TPS51632_MIN_VOLATGE 500000
#define TPS51632_MAX_VOLATGE 1520000
#define TPS51632_VOLATGE_STEP_10mV 10000
#define TPS51632_VOLATGE_STEP_20mV 20000
#define TPS51632_MAX_VSEL 0x7F
#define TPS51632_MIN_VSEL 0x19
#define TPS51632_DEFAULT_RAMP_DELAY 6000
#define TPS51632_VOLT_VSEL(uV) \
(DIV_ROUND_UP(uV - TPS51632_MIN_VOLATGE, \
TPS51632_VOLATGE_STEP_10mV) + \
TPS51632_MIN_VSEL)
/* TPS51632 chip information */
struct tps51632_chip {
struct device *dev;
struct regulator_desc desc;
struct regulator_dev *rdev;
struct regmap *regmap;
bool enable_pwm_dvfs;
};
static int tps51632_dcdc_get_voltage_sel(struct regulator_dev *rdev)
{
struct tps51632_chip *tps = rdev_get_drvdata(rdev);
unsigned int data;
int ret;
unsigned int reg = TPS51632_VOLTAGE_SELECT_REG;
int vsel;
if (tps->enable_pwm_dvfs)
reg = TPS51632_VOLTAGE_BASE_REG;
ret = regmap_read(tps->regmap, reg, &data);
if (ret < 0) {
dev_err(tps->dev, "reg read failed, err %d\n", ret);
return ret;
}
vsel = data & TPS51632_VOUT_MASK;
return vsel;
}
static int tps51632_dcdc_set_voltage_sel(struct regulator_dev *rdev,
unsigned selector)
{
struct tps51632_chip *tps = rdev_get_drvdata(rdev);
int ret;
unsigned int reg = TPS51632_VOLTAGE_SELECT_REG;
if (tps->enable_pwm_dvfs)
reg = TPS51632_VOLTAGE_BASE_REG;
if (selector > TPS51632_MAX_VSEL)
return -EINVAL;
ret = regmap_write(tps->regmap, reg, selector);
if (ret < 0)
dev_err(tps->dev, "reg write failed, err %d\n", ret);
return ret;
}
static int tps51632_dcdc_set_ramp_delay(struct regulator_dev *rdev,
int ramp_delay)
{
struct tps51632_chip *tps = rdev_get_drvdata(rdev);
int bit = ramp_delay/6000;
int ret;
if (bit)
bit--;
ret = regmap_write(tps->regmap, TPS51632_SLEW_REGS, BIT(bit));
if (ret < 0)
dev_err(tps->dev, "SLEW reg write failed, err %d\n", ret);
return ret;
}
static struct regulator_ops tps51632_dcdc_ops = {
.get_voltage_sel = tps51632_dcdc_get_voltage_sel,
.set_voltage_sel = tps51632_dcdc_set_voltage_sel,
.list_voltage = regulator_list_voltage_linear,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_ramp_delay = tps51632_dcdc_set_ramp_delay,
};
static int tps51632_init_dcdc(struct tps51632_chip *tps,
struct tps51632_regulator_platform_data *pdata)
{
int ret;
uint8_t control = 0;
int vsel;
if (!pdata->enable_pwm_dvfs)
goto skip_pwm_config;
control |= TPS51632_DVFS_PWMEN;
tps->enable_pwm_dvfs = pdata->enable_pwm_dvfs;
vsel = TPS51632_VOLT_VSEL(pdata->base_voltage_uV);
ret = regmap_write(tps->regmap, TPS51632_VOLTAGE_BASE_REG, vsel);
if (ret < 0) {
dev_err(tps->dev, "BASE reg write failed, err %d\n", ret);
return ret;
}
if (pdata->dvfs_step_20mV)
control |= TPS51632_DVFS_STEP_20;
if (pdata->max_voltage_uV) {
unsigned int vmax;
/**
* TPS51632 hw behavior: VMAX register can be write only
* once as it get locked after first write. The lock get
* reset only when device is power-reset.
* Write register only when lock bit is not enabled.
*/
ret = regmap_read(tps->regmap, TPS51632_VMAX_REG, &vmax);
if (ret < 0) {
dev_err(tps->dev, "VMAX read failed, err %d\n", ret);
return ret;
}
if (!(vmax & TPS51632_VMAX_LOCK)) {
vsel = TPS51632_VOLT_VSEL(pdata->max_voltage_uV);
ret = regmap_write(tps->regmap, TPS51632_VMAX_REG,
vsel);
if (ret < 0) {
dev_err(tps->dev,
"VMAX write failed, err %d\n", ret);
return ret;
}
}
}
skip_pwm_config:
ret = regmap_write(tps->regmap, TPS51632_DVFS_CONTROL_REG, control);
if (ret < 0)
dev_err(tps->dev, "DVFS reg write failed, err %d\n", ret);
return ret;
}
static bool rd_wr_reg(struct device *dev, unsigned int reg)
{
if ((reg >= 0x8) && (reg <= 0x10))
return false;
return true;
}
static const struct regmap_config tps51632_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.writeable_reg = rd_wr_reg,
.readable_reg = rd_wr_reg,
.max_register = TPS51632_MAX_REG - 1,
.cache_type = REGCACHE_RBTREE,
};
static int tps51632_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tps51632_regulator_platform_data *pdata;
struct regulator_dev *rdev;
struct tps51632_chip *tps;
int ret;
struct regulator_config config = { };
pdata = client->dev.platform_data;
if (!pdata) {
dev_err(&client->dev, "No Platform data\n");
return -EINVAL;
}
if (pdata->enable_pwm_dvfs) {
if ((pdata->base_voltage_uV < TPS51632_MIN_VOLATGE) ||
(pdata->base_voltage_uV > TPS51632_MAX_VOLATGE)) {
dev_err(&client->dev, "Invalid base_voltage_uV setting\n");
return -EINVAL;
}
if ((pdata->max_voltage_uV) &&
((pdata->max_voltage_uV < TPS51632_MIN_VOLATGE) ||
(pdata->max_voltage_uV > TPS51632_MAX_VOLATGE))) {
dev_err(&client->dev, "Invalid max_voltage_uV setting\n");
return -EINVAL;
}
}
tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
if (!tps) {
dev_err(&client->dev, "Memory allocation failed\n");
return -ENOMEM;
}
tps->dev = &client->dev;
tps->desc.name = id->name;
tps->desc.id = 0;
tps->desc.ramp_delay = TPS51632_DEFAULT_RAMP_DELAY;
tps->desc.min_uV = TPS51632_MIN_VOLATGE;
tps->desc.uV_step = TPS51632_VOLATGE_STEP_10mV;
tps->desc.linear_min_sel = TPS51632_MIN_VSEL;
tps->desc.n_voltages = TPS51632_MAX_VSEL + 1;
tps->desc.ops = &tps51632_dcdc_ops;
tps->desc.type = REGULATOR_VOLTAGE;
tps->desc.owner = THIS_MODULE;
tps->regmap = devm_regmap_init_i2c(client, &tps51632_regmap_config);
if (IS_ERR(tps->regmap)) {
ret = PTR_ERR(tps->regmap);
dev_err(&client->dev, "regmap init failed, err %d\n", ret);
return ret;
}
i2c_set_clientdata(client, tps);
ret = tps51632_init_dcdc(tps, pdata);
if (ret < 0) {
dev_err(tps->dev, "Init failed, err = %d\n", ret);
return ret;
}
/* Register the regulators */
config.dev = &client->dev;
config.init_data = pdata->reg_init_data;
config.driver_data = tps;
config.regmap = tps->regmap;
config.of_node = client->dev.of_node;
rdev = regulator_register(&tps->desc, &config);
if (IS_ERR(rdev)) {
dev_err(tps->dev, "regulator register failed\n");
return PTR_ERR(rdev);
}
tps->rdev = rdev;
return 0;
}
static int tps51632_remove(struct i2c_client *client)
{
struct tps51632_chip *tps = i2c_get_clientdata(client);
regulator_unregister(tps->rdev);
return 0;
}
static const struct i2c_device_id tps51632_id[] = {
{.name = "tps51632",},
{},
};
MODULE_DEVICE_TABLE(i2c, tps51632_id);
static struct i2c_driver tps51632_i2c_driver = {
.driver = {
.name = "tps51632",
.owner = THIS_MODULE,
},
.probe = tps51632_probe,
.remove = tps51632_remove,
.id_table = tps51632_id,
};
static int __init tps51632_init(void)
{
return i2c_add_driver(&tps51632_i2c_driver);
}
subsys_initcall(tps51632_init);
static void __exit tps51632_cleanup(void)
{
i2c_del_driver(&tps51632_i2c_driver);
}
module_exit(tps51632_cleanup);
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_DESCRIPTION("TPS51632 voltage regulator driver");
MODULE_LICENSE("GPL v2");
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