549 lines
13 KiB
C
549 lines
13 KiB
C
/*
|
|
* LP8755 High Performance Power Management Unit : System Interface Driver
|
|
* (based on rev. 0.26)
|
|
* Copyright 2012 Texas Instruments
|
|
*
|
|
* Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/err.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/regulator/driver.h>
|
|
#include <linux/regulator/machine.h>
|
|
#include <linux/platform_data/lp8755.h>
|
|
|
|
#define LP8755_REG_BUCK0 0x00
|
|
#define LP8755_REG_BUCK1 0x03
|
|
#define LP8755_REG_BUCK2 0x04
|
|
#define LP8755_REG_BUCK3 0x01
|
|
#define LP8755_REG_BUCK4 0x05
|
|
#define LP8755_REG_BUCK5 0x02
|
|
#define LP8755_REG_MAX 0xFF
|
|
|
|
#define LP8755_BUCK_EN_M BIT(7)
|
|
#define LP8755_BUCK_LINEAR_OUT_MAX 0x76
|
|
#define LP8755_BUCK_VOUT_M 0x7F
|
|
|
|
struct lp8755_mphase {
|
|
int nreg;
|
|
int buck_num[LP8755_BUCK_MAX];
|
|
};
|
|
|
|
struct lp8755_chip {
|
|
struct device *dev;
|
|
struct regmap *regmap;
|
|
struct lp8755_platform_data *pdata;
|
|
|
|
int irq;
|
|
unsigned int irqmask;
|
|
|
|
int mphase;
|
|
struct regulator_dev *rdev[LP8755_BUCK_MAX];
|
|
};
|
|
|
|
/**
|
|
*lp8755_read : read a single register value from lp8755.
|
|
*@pchip : device to read from
|
|
*@reg : register to read from
|
|
*@val : pointer to store read value
|
|
*/
|
|
static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
|
|
unsigned int *val)
|
|
{
|
|
return regmap_read(pchip->regmap, reg, val);
|
|
}
|
|
|
|
/**
|
|
*lp8755_write : write a single register value to lp8755.
|
|
*@pchip : device to write to
|
|
*@reg : register to write to
|
|
*@val : value to be written
|
|
*/
|
|
static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
|
|
unsigned int val)
|
|
{
|
|
return regmap_write(pchip->regmap, reg, val);
|
|
}
|
|
|
|
/**
|
|
*lp8755_update_bits : set the values of bit fields in lp8755 register.
|
|
*@pchip : device to read from
|
|
*@reg : register to update
|
|
*@mask : bitmask to be changed
|
|
*@val : value for bitmask
|
|
*/
|
|
static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
|
|
unsigned int mask, unsigned int val)
|
|
{
|
|
return regmap_update_bits(pchip->regmap, reg, mask, val);
|
|
}
|
|
|
|
static int lp8755_buck_enable_time(struct regulator_dev *rdev)
|
|
{
|
|
int ret;
|
|
unsigned int regval;
|
|
enum lp8755_bucks id = rdev_get_id(rdev);
|
|
struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
|
|
|
|
ret = lp8755_read(pchip, 0x12 + id, ®val);
|
|
if (ret < 0) {
|
|
dev_err(pchip->dev, "i2c access error %s\n", __func__);
|
|
return ret;
|
|
}
|
|
return (regval & 0xff) * 100;
|
|
}
|
|
|
|
static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
|
|
{
|
|
int ret;
|
|
unsigned int regbval = 0x0;
|
|
enum lp8755_bucks id = rdev_get_id(rdev);
|
|
struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
|
|
|
|
switch (mode) {
|
|
case REGULATOR_MODE_FAST:
|
|
/* forced pwm mode */
|
|
regbval = (0x01 << id);
|
|
break;
|
|
case REGULATOR_MODE_NORMAL:
|
|
/* enable automatic pwm/pfm mode */
|
|
ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
|
|
if (ret < 0)
|
|
goto err_i2c;
|
|
break;
|
|
case REGULATOR_MODE_IDLE:
|
|
/* enable automatic pwm/pfm/lppfm mode */
|
|
ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
|
|
if (ret < 0)
|
|
goto err_i2c;
|
|
|
|
ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
|
|
if (ret < 0)
|
|
goto err_i2c;
|
|
break;
|
|
default:
|
|
dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
|
|
/* forced pwm mode */
|
|
regbval = (0x01 << id);
|
|
}
|
|
|
|
ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
|
|
if (ret < 0)
|
|
goto err_i2c;
|
|
return ret;
|
|
err_i2c:
|
|
dev_err(pchip->dev, "i2c access error %s\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
|
|
{
|
|
int ret;
|
|
unsigned int regval;
|
|
enum lp8755_bucks id = rdev_get_id(rdev);
|
|
struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
|
|
|
|
ret = lp8755_read(pchip, 0x06, ®val);
|
|
if (ret < 0)
|
|
goto err_i2c;
|
|
|
|
/* mode fast means forced pwm mode */
|
|
if (regval & (0x01 << id))
|
|
return REGULATOR_MODE_FAST;
|
|
|
|
ret = lp8755_read(pchip, 0x08 + id, ®val);
|
|
if (ret < 0)
|
|
goto err_i2c;
|
|
|
|
/* mode idle means automatic pwm/pfm/lppfm mode */
|
|
if (regval & 0x20)
|
|
return REGULATOR_MODE_IDLE;
|
|
|
|
/* mode normal means automatic pwm/pfm mode */
|
|
return REGULATOR_MODE_NORMAL;
|
|
|
|
err_i2c:
|
|
dev_err(pchip->dev, "i2c access error %s\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
|
|
{
|
|
int ret;
|
|
unsigned int regval = 0x00;
|
|
enum lp8755_bucks id = rdev_get_id(rdev);
|
|
struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
|
|
|
|
/* uV/us */
|
|
switch (ramp) {
|
|
case 0 ... 230:
|
|
regval = 0x07;
|
|
break;
|
|
case 231 ... 470:
|
|
regval = 0x06;
|
|
break;
|
|
case 471 ... 940:
|
|
regval = 0x05;
|
|
break;
|
|
case 941 ... 1900:
|
|
regval = 0x04;
|
|
break;
|
|
case 1901 ... 3800:
|
|
regval = 0x03;
|
|
break;
|
|
case 3801 ... 7500:
|
|
regval = 0x02;
|
|
break;
|
|
case 7501 ... 15000:
|
|
regval = 0x01;
|
|
break;
|
|
case 15001 ... 30000:
|
|
regval = 0x00;
|
|
break;
|
|
default:
|
|
dev_err(pchip->dev,
|
|
"Not supported ramp value %d %s\n", ramp, __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
|
|
if (ret < 0)
|
|
goto err_i2c;
|
|
return ret;
|
|
err_i2c:
|
|
dev_err(pchip->dev, "i2c access error %s\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
static const struct regulator_ops lp8755_buck_ops = {
|
|
.map_voltage = regulator_map_voltage_linear,
|
|
.list_voltage = regulator_list_voltage_linear,
|
|
.set_voltage_sel = regulator_set_voltage_sel_regmap,
|
|
.get_voltage_sel = regulator_get_voltage_sel_regmap,
|
|
.enable = regulator_enable_regmap,
|
|
.disable = regulator_disable_regmap,
|
|
.is_enabled = regulator_is_enabled_regmap,
|
|
.enable_time = lp8755_buck_enable_time,
|
|
.set_mode = lp8755_buck_set_mode,
|
|
.get_mode = lp8755_buck_get_mode,
|
|
.set_ramp_delay = lp8755_buck_set_ramp,
|
|
};
|
|
|
|
#define lp8755_rail(_id) "lp8755_buck"#_id
|
|
#define lp8755_buck_init(_id)\
|
|
{\
|
|
.constraints = {\
|
|
.name = lp8755_rail(_id),\
|
|
.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
|
|
.min_uV = 500000,\
|
|
.max_uV = 1675000,\
|
|
},\
|
|
}
|
|
|
|
static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
|
|
[LP8755_BUCK0] = lp8755_buck_init(0),
|
|
[LP8755_BUCK1] = lp8755_buck_init(1),
|
|
[LP8755_BUCK2] = lp8755_buck_init(2),
|
|
[LP8755_BUCK3] = lp8755_buck_init(3),
|
|
[LP8755_BUCK4] = lp8755_buck_init(4),
|
|
[LP8755_BUCK5] = lp8755_buck_init(5),
|
|
};
|
|
|
|
static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
|
|
{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
|
|
{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
|
|
LP8755_BUCK4, LP8755_BUCK5 } },
|
|
{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
|
|
LP8755_BUCK5} },
|
|
{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
|
|
{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
|
|
{ 2, { LP8755_BUCK0, LP8755_BUCK5} },
|
|
{ 1, { LP8755_BUCK0} },
|
|
{ 2, { LP8755_BUCK0, LP8755_BUCK3} },
|
|
{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
|
|
};
|
|
|
|
static int lp8755_init_data(struct lp8755_chip *pchip)
|
|
{
|
|
unsigned int regval;
|
|
int ret, icnt, buck_num;
|
|
struct lp8755_platform_data *pdata = pchip->pdata;
|
|
|
|
/* read back muti-phase configuration */
|
|
ret = lp8755_read(pchip, 0x3D, ®val);
|
|
if (ret < 0)
|
|
goto out_i2c_error;
|
|
pchip->mphase = regval & 0x0F;
|
|
|
|
/* set default data based on multi-phase config */
|
|
for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
|
|
buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
|
|
pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
|
|
}
|
|
return ret;
|
|
|
|
out_i2c_error:
|
|
dev_err(pchip->dev, "i2c access error %s\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
#define lp8755_buck_desc(_id)\
|
|
{\
|
|
.name = lp8755_rail(_id),\
|
|
.id = LP8755_BUCK##_id,\
|
|
.ops = &lp8755_buck_ops,\
|
|
.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
|
|
.uV_step = 10000,\
|
|
.min_uV = 500000,\
|
|
.type = REGULATOR_VOLTAGE,\
|
|
.owner = THIS_MODULE,\
|
|
.enable_reg = LP8755_REG_BUCK##_id,\
|
|
.enable_mask = LP8755_BUCK_EN_M,\
|
|
.vsel_reg = LP8755_REG_BUCK##_id,\
|
|
.vsel_mask = LP8755_BUCK_VOUT_M,\
|
|
}
|
|
|
|
static const struct regulator_desc lp8755_regulators[] = {
|
|
lp8755_buck_desc(0),
|
|
lp8755_buck_desc(1),
|
|
lp8755_buck_desc(2),
|
|
lp8755_buck_desc(3),
|
|
lp8755_buck_desc(4),
|
|
lp8755_buck_desc(5),
|
|
};
|
|
|
|
static int lp8755_regulator_init(struct lp8755_chip *pchip)
|
|
{
|
|
int ret, icnt, buck_num;
|
|
struct lp8755_platform_data *pdata = pchip->pdata;
|
|
struct regulator_config rconfig = { };
|
|
|
|
rconfig.regmap = pchip->regmap;
|
|
rconfig.dev = pchip->dev;
|
|
rconfig.driver_data = pchip;
|
|
|
|
for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
|
|
buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
|
|
rconfig.init_data = pdata->buck_data[buck_num];
|
|
rconfig.of_node = pchip->dev->of_node;
|
|
pchip->rdev[buck_num] =
|
|
devm_regulator_register(pchip->dev,
|
|
&lp8755_regulators[buck_num], &rconfig);
|
|
if (IS_ERR(pchip->rdev[buck_num])) {
|
|
ret = PTR_ERR(pchip->rdev[buck_num]);
|
|
pchip->rdev[buck_num] = NULL;
|
|
dev_err(pchip->dev, "regulator init failed: buck %d\n",
|
|
buck_num);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t lp8755_irq_handler(int irq, void *data)
|
|
{
|
|
int ret, icnt;
|
|
unsigned int flag0, flag1;
|
|
struct lp8755_chip *pchip = data;
|
|
|
|
/* read flag0 register */
|
|
ret = lp8755_read(pchip, 0x0D, &flag0);
|
|
if (ret < 0)
|
|
goto err_i2c;
|
|
/* clear flag register to pull up int. pin */
|
|
ret = lp8755_write(pchip, 0x0D, 0x00);
|
|
if (ret < 0)
|
|
goto err_i2c;
|
|
|
|
/* sent power fault detection event to specific regulator */
|
|
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
|
|
if ((flag0 & (0x4 << icnt))
|
|
&& (pchip->irqmask & (0x04 << icnt))
|
|
&& (pchip->rdev[icnt] != NULL))
|
|
regulator_notifier_call_chain(pchip->rdev[icnt],
|
|
LP8755_EVENT_PWR_FAULT,
|
|
NULL);
|
|
|
|
/* read flag1 register */
|
|
ret = lp8755_read(pchip, 0x0E, &flag1);
|
|
if (ret < 0)
|
|
goto err_i2c;
|
|
/* clear flag register to pull up int. pin */
|
|
ret = lp8755_write(pchip, 0x0E, 0x00);
|
|
if (ret < 0)
|
|
goto err_i2c;
|
|
|
|
/* send OCP event to all regulator devices */
|
|
if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
|
|
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
|
|
if (pchip->rdev[icnt] != NULL)
|
|
regulator_notifier_call_chain(pchip->rdev[icnt],
|
|
LP8755_EVENT_OCP,
|
|
NULL);
|
|
|
|
/* send OVP event to all regulator devices */
|
|
if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
|
|
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
|
|
if (pchip->rdev[icnt] != NULL)
|
|
regulator_notifier_call_chain(pchip->rdev[icnt],
|
|
LP8755_EVENT_OVP,
|
|
NULL);
|
|
return IRQ_HANDLED;
|
|
|
|
err_i2c:
|
|
dev_err(pchip->dev, "i2c access error %s\n", __func__);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
static int lp8755_int_config(struct lp8755_chip *pchip)
|
|
{
|
|
int ret;
|
|
unsigned int regval;
|
|
|
|
if (pchip->irq == 0) {
|
|
dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
ret = lp8755_read(pchip, 0x0F, ®val);
|
|
if (ret < 0) {
|
|
dev_err(pchip->dev, "i2c access error %s\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
pchip->irqmask = regval;
|
|
return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
|
|
lp8755_irq_handler,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
"lp8755-irq", pchip);
|
|
}
|
|
|
|
static const struct regmap_config lp8755_regmap = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = LP8755_REG_MAX,
|
|
};
|
|
|
|
static int lp8755_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int ret, icnt;
|
|
struct lp8755_chip *pchip;
|
|
struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
|
dev_err(&client->dev, "i2c functionality check fail.\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
pchip = devm_kzalloc(&client->dev,
|
|
sizeof(struct lp8755_chip), GFP_KERNEL);
|
|
if (!pchip)
|
|
return -ENOMEM;
|
|
|
|
pchip->dev = &client->dev;
|
|
pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
|
|
if (IS_ERR(pchip->regmap)) {
|
|
ret = PTR_ERR(pchip->regmap);
|
|
dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
|
|
return ret;
|
|
}
|
|
i2c_set_clientdata(client, pchip);
|
|
|
|
if (pdata != NULL) {
|
|
pchip->pdata = pdata;
|
|
pchip->mphase = pdata->mphase;
|
|
} else {
|
|
pchip->pdata = devm_kzalloc(pchip->dev,
|
|
sizeof(struct lp8755_platform_data),
|
|
GFP_KERNEL);
|
|
if (!pchip->pdata)
|
|
return -ENOMEM;
|
|
ret = lp8755_init_data(pchip);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "fail to initialize chip\n");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
ret = lp8755_regulator_init(pchip);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "fail to initialize regulators\n");
|
|
goto err;
|
|
}
|
|
|
|
pchip->irq = client->irq;
|
|
ret = lp8755_int_config(pchip);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "fail to irq config\n");
|
|
goto err;
|
|
}
|
|
|
|
return ret;
|
|
|
|
err:
|
|
/* output disable */
|
|
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
|
|
lp8755_write(pchip, icnt, 0x00);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int lp8755_remove(struct i2c_client *client)
|
|
{
|
|
int icnt;
|
|
struct lp8755_chip *pchip = i2c_get_clientdata(client);
|
|
|
|
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
|
|
lp8755_write(pchip, icnt, 0x00);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id lp8755_id[] = {
|
|
{LP8755_NAME, 0},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, lp8755_id);
|
|
|
|
static struct i2c_driver lp8755_i2c_driver = {
|
|
.driver = {
|
|
.name = LP8755_NAME,
|
|
},
|
|
.probe = lp8755_probe,
|
|
.remove = lp8755_remove,
|
|
.id_table = lp8755_id,
|
|
};
|
|
|
|
static int __init lp8755_init(void)
|
|
{
|
|
return i2c_add_driver(&lp8755_i2c_driver);
|
|
}
|
|
|
|
subsys_initcall(lp8755_init);
|
|
|
|
static void __exit lp8755_exit(void)
|
|
{
|
|
i2c_del_driver(&lp8755_i2c_driver);
|
|
}
|
|
|
|
module_exit(lp8755_exit);
|
|
|
|
MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
|
|
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
|
|
MODULE_LICENSE("GPL v2");
|