Revision 761bfb999868c413aabed8caa345694836ec6f11 authored by Alex Deucher on 06 August 2013, 17:34:00 UTC, committed by Alex Deucher on 07 August 2013, 21:37:19 UTC
The rlc is required for dpm to work properly, so if the rlc ucode is missing, don't enable dpm. Enabling dpm without the rlc enabled can result in hangs. Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 parent f61d5b4
lp8755.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 acceess 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 acceess 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 acceess 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 acceess error %s\n", __func__);
return ret;
}
static struct regulator_ops lp8755_buck_ops = {
.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 acceess 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 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] =
regulator_register(&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);
goto err_buck;
}
}
return 0;
err_buck:
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
regulator_unregister(pchip->rdev[icnt]);
return ret;
}
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 regualtor 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 regualtor 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 acceess 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)
goto err_i2c;
pchip->irqmask = regval;
ret = request_threaded_irq(pchip->irq, NULL, lp8755_irq_handler,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"lp8755-irq", pchip);
if (ret)
return ret;
return ret;
err_i2c:
dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
return ret;
}
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 = client->dev.platform_data;
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_regulator;
}
pchip->irq = client->irq;
ret = lp8755_int_config(pchip);
if (ret < 0) {
dev_err(&client->dev, "fail to irq config\n");
goto err_irq;
}
return ret;
err_irq:
for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
regulator_unregister(pchip->rdev[icnt]);
err_regulator:
/* 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 < mphase_buck[pchip->mphase].nreg; icnt++)
regulator_unregister(pchip->rdev[icnt]);
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
lp8755_write(pchip, icnt, 0x00);
if (pchip->irq != 0)
free_irq(pchip->irq, pchip);
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");
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