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linux-pinenote/drivers/regulator/tps6507x-regulator.c
Anuj Aggarwal 7d14831e21 regulator: tps6507x: allow driver to use DEFDCDC{2,3}_HIGH register 
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

In TPS6507x, depending on the status of DEFDCDC{2,3} pin either
DEFDCDC{2,3}_LOW or DEFDCDC{2,3}_HIGH register needs to be read or
programmed to change the output voltage.

The current driver assumes DEFDCDC{2,3} pins are always tied low
and thus operates only on DEFDCDC{2,3}_LOW register. This need
not always be the case (as is found on OMAP-L138 EVM).

Unfortunately, software cannot read the status of DEFDCDC{2,3} pins.
So, this information is passed through platform data depending on
how the board is wired.

Signed-off-by: Anuj Aggarwal <anuj.aggarwal@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2010-07-28 15:09:26 +01:00

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/*
* tps6507x-regulator.c
*
* Regulator driver for TPS65073 PMIC
*
* Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/tps6507x.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/mfd/tps6507x.h>
/* DCDC's */
#define TPS6507X_DCDC_1 0
#define TPS6507X_DCDC_2 1
#define TPS6507X_DCDC_3 2
/* LDOs */
#define TPS6507X_LDO_1 3
#define TPS6507X_LDO_2 4
#define TPS6507X_MAX_REG_ID TPS6507X_LDO_2
/* Number of step-down converters available */
#define TPS6507X_NUM_DCDC 3
/* Number of LDO voltage regulators available */
#define TPS6507X_NUM_LDO 2
/* Number of total regulators available */
#define TPS6507X_NUM_REGULATOR (TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)
/* Supported voltage values for regulators (in milliVolts) */
static const u16 VDCDCx_VSEL_table[] = {
725, 750, 775, 800,
825, 850, 875, 900,
925, 950, 975, 1000,
1025, 1050, 1075, 1100,
1125, 1150, 1175, 1200,
1225, 1250, 1275, 1300,
1325, 1350, 1375, 1400,
1425, 1450, 1475, 1500,
1550, 1600, 1650, 1700,
1750, 1800, 1850, 1900,
1950, 2000, 2050, 2100,
2150, 2200, 2250, 2300,
2350, 2400, 2450, 2500,
2550, 2600, 2650, 2700,
2750, 2800, 2850, 2900,
3000, 3100, 3200, 3300,
};
static const u16 LDO1_VSEL_table[] = {
1000, 1100, 1200, 1250,
1300, 1350, 1400, 1500,
1600, 1800, 2500, 2750,
2800, 3000, 3100, 3300,
};
static const u16 LDO2_VSEL_table[] = {
725, 750, 775, 800,
825, 850, 875, 900,
925, 950, 975, 1000,
1025, 1050, 1075, 1100,
1125, 1150, 1175, 1200,
1225, 1250, 1275, 1300,
1325, 1350, 1375, 1400,
1425, 1450, 1475, 1500,
1550, 1600, 1650, 1700,
1750, 1800, 1850, 1900,
1950, 2000, 2050, 2100,
2150, 2200, 2250, 2300,
2350, 2400, 2450, 2500,
2550, 2600, 2650, 2700,
2750, 2800, 2850, 2900,
3000, 3100, 3200, 3300,
};
static unsigned int num_voltages[] = {ARRAY_SIZE(VDCDCx_VSEL_table),
ARRAY_SIZE(VDCDCx_VSEL_table),
ARRAY_SIZE(VDCDCx_VSEL_table),
ARRAY_SIZE(LDO1_VSEL_table),
ARRAY_SIZE(LDO2_VSEL_table)};
struct tps_info {
const char *name;
unsigned min_uV;
unsigned max_uV;
u8 table_len;
const u16 *table;
/* Does DCDC high or the low register defines output voltage? */
bool defdcdc_default;
};
static struct tps_info tps6507x_pmic_regs[] = {
{
.name = "VDCDC1",
.min_uV = 725000,
.max_uV = 3300000,
.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
.table = VDCDCx_VSEL_table,
},
{
.name = "VDCDC2",
.min_uV = 725000,
.max_uV = 3300000,
.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
.table = VDCDCx_VSEL_table,
},
{
.name = "VDCDC3",
.min_uV = 725000,
.max_uV = 3300000,
.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
.table = VDCDCx_VSEL_table,
},
{
.name = "LDO1",
.min_uV = 1000000,
.max_uV = 3300000,
.table_len = ARRAY_SIZE(LDO1_VSEL_table),
.table = LDO1_VSEL_table,
},
{
.name = "LDO2",
.min_uV = 725000,
.max_uV = 3300000,
.table_len = ARRAY_SIZE(LDO2_VSEL_table),
.table = LDO2_VSEL_table,
},
};
struct tps6507x_pmic {
struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
struct tps6507x_dev *mfd;
struct regulator_dev *rdev[TPS6507X_NUM_REGULATOR];
struct tps_info *info[TPS6507X_NUM_REGULATOR];
struct mutex io_lock;
};
static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
{
u8 val;
int err;
err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);
if (err)
return err;
return val;
}
static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
{
return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
}
static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
{
int err, data;
mutex_lock(&tps->io_lock);
data = tps6507x_pmic_read(tps, reg);
if (data < 0) {
dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
err = data;
goto out;
}
data |= mask;
err = tps6507x_pmic_write(tps, reg, data);
if (err)
dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
out:
mutex_unlock(&tps->io_lock);
return err;
}
static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
{
int err, data;
mutex_lock(&tps->io_lock);
data = tps6507x_pmic_read(tps, reg);
if (data < 0) {
dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
err = data;
goto out;
}
data &= ~mask;
err = tps6507x_pmic_write(tps, reg, data);
if (err)
dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
out:
mutex_unlock(&tps->io_lock);
return err;
}
static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
{
int data;
mutex_lock(&tps->io_lock);
data = tps6507x_pmic_read(tps, reg);
if (data < 0)
dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
mutex_unlock(&tps->io_lock);
return data;
}
static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
{
int err;
mutex_lock(&tps->io_lock);
err = tps6507x_pmic_write(tps, reg, val);
if (err < 0)
dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
mutex_unlock(&tps->io_lock);
return err;
}
static int tps6507x_pmic_dcdc_is_enabled(struct regulator_dev *dev)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int data, dcdc = rdev_get_id(dev);
u8 shift;
if (dcdc < TPS6507X_DCDC_1 || dcdc > TPS6507X_DCDC_3)
return -EINVAL;
shift = TPS6507X_MAX_REG_ID - dcdc;
data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
if (data < 0)
return data;
else
return (data & 1<<shift) ? 1 : 0;
}
static int tps6507x_pmic_ldo_is_enabled(struct regulator_dev *dev)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int data, ldo = rdev_get_id(dev);
u8 shift;
if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
return -EINVAL;
shift = TPS6507X_MAX_REG_ID - ldo;
data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
if (data < 0)
return data;
else
return (data & 1<<shift) ? 1 : 0;
}
static int tps6507x_pmic_dcdc_enable(struct regulator_dev *dev)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int dcdc = rdev_get_id(dev);
u8 shift;
if (dcdc < TPS6507X_DCDC_1 || dcdc > TPS6507X_DCDC_3)
return -EINVAL;
shift = TPS6507X_MAX_REG_ID - dcdc;
return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
}
static int tps6507x_pmic_dcdc_disable(struct regulator_dev *dev)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int dcdc = rdev_get_id(dev);
u8 shift;
if (dcdc < TPS6507X_DCDC_1 || dcdc > TPS6507X_DCDC_3)
return -EINVAL;
shift = TPS6507X_MAX_REG_ID - dcdc;
return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
1 << shift);
}
static int tps6507x_pmic_ldo_enable(struct regulator_dev *dev)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev);
u8 shift;
if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
return -EINVAL;
shift = TPS6507X_MAX_REG_ID - ldo;
return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
}
static int tps6507x_pmic_ldo_disable(struct regulator_dev *dev)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev);
u8 shift;
if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
return -EINVAL;
shift = TPS6507X_MAX_REG_ID - ldo;
return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
1 << shift);
}
static int tps6507x_pmic_dcdc_get_voltage(struct regulator_dev *dev)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int data, dcdc = rdev_get_id(dev);
u8 reg;
switch (dcdc) {
case TPS6507X_DCDC_1:
reg = TPS6507X_REG_DEFDCDC1;
break;
case TPS6507X_DCDC_2:
if (tps->info[dcdc]->defdcdc_default)
reg = TPS6507X_REG_DEFDCDC2_HIGH;
else
reg = TPS6507X_REG_DEFDCDC2_LOW;
break;
case TPS6507X_DCDC_3:
if (tps->info[dcdc]->defdcdc_default)
reg = TPS6507X_REG_DEFDCDC3_HIGH;
else
reg = TPS6507X_REG_DEFDCDC3_LOW;
break;
default:
return -EINVAL;
}
data = tps6507x_pmic_reg_read(tps, reg);
if (data < 0)
return data;
data &= TPS6507X_DEFDCDCX_DCDC_MASK;
return tps->info[dcdc]->table[data] * 1000;
}
static int tps6507x_pmic_dcdc_set_voltage(struct regulator_dev *dev,
int min_uV, int max_uV)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int data, vsel, dcdc = rdev_get_id(dev);
u8 reg;
switch (dcdc) {
case TPS6507X_DCDC_1:
reg = TPS6507X_REG_DEFDCDC1;
break;
case TPS6507X_DCDC_2:
if (tps->info[dcdc]->defdcdc_default)
reg = TPS6507X_REG_DEFDCDC2_HIGH;
else
reg = TPS6507X_REG_DEFDCDC2_LOW;
break;
case TPS6507X_DCDC_3:
if (tps->info[dcdc]->defdcdc_default)
reg = TPS6507X_REG_DEFDCDC3_HIGH;
else
reg = TPS6507X_REG_DEFDCDC3_LOW;
break;
default:
return -EINVAL;
}
if (min_uV < tps->info[dcdc]->min_uV
|| min_uV > tps->info[dcdc]->max_uV)
return -EINVAL;
if (max_uV < tps->info[dcdc]->min_uV
|| max_uV > tps->info[dcdc]->max_uV)
return -EINVAL;
for (vsel = 0; vsel < tps->info[dcdc]->table_len; vsel++) {
int mV = tps->info[dcdc]->table[vsel];
int uV = mV * 1000;
/* Break at the first in-range value */
if (min_uV <= uV && uV <= max_uV)
break;
}
/* write to the register in case we found a match */
if (vsel == tps->info[dcdc]->table_len)
return -EINVAL;
data = tps6507x_pmic_reg_read(tps, reg);
if (data < 0)
return data;
data &= ~TPS6507X_DEFDCDCX_DCDC_MASK;
data |= vsel;
return tps6507x_pmic_reg_write(tps, reg, data);
}
static int tps6507x_pmic_ldo_get_voltage(struct regulator_dev *dev)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int data, ldo = rdev_get_id(dev);
u8 reg, mask;
if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
return -EINVAL;
else {
reg = (ldo == TPS6507X_LDO_1 ?
TPS6507X_REG_LDO_CTRL1 : TPS6507X_REG_DEFLDO2);
mask = (ldo == TPS6507X_LDO_1 ?
TPS6507X_REG_LDO_CTRL1_LDO1_MASK :
TPS6507X_REG_DEFLDO2_LDO2_MASK);
}
data = tps6507x_pmic_reg_read(tps, reg);
if (data < 0)
return data;
data &= mask;
return tps->info[ldo]->table[data] * 1000;
}
static int tps6507x_pmic_ldo_set_voltage(struct regulator_dev *dev,
int min_uV, int max_uV)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int data, vsel, ldo = rdev_get_id(dev);
u8 reg, mask;
if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
return -EINVAL;
else {
reg = (ldo == TPS6507X_LDO_1 ?
TPS6507X_REG_LDO_CTRL1 : TPS6507X_REG_DEFLDO2);
mask = (ldo == TPS6507X_LDO_1 ?
TPS6507X_REG_LDO_CTRL1_LDO1_MASK :
TPS6507X_REG_DEFLDO2_LDO2_MASK);
}
if (min_uV < tps->info[ldo]->min_uV || min_uV > tps->info[ldo]->max_uV)
return -EINVAL;
if (max_uV < tps->info[ldo]->min_uV || max_uV > tps->info[ldo]->max_uV)
return -EINVAL;
for (vsel = 0; vsel < tps->info[ldo]->table_len; vsel++) {
int mV = tps->info[ldo]->table[vsel];
int uV = mV * 1000;
/* Break at the first in-range value */
if (min_uV <= uV && uV <= max_uV)
break;
}
if (vsel == tps->info[ldo]->table_len)
return -EINVAL;
data = tps6507x_pmic_reg_read(tps, reg);
if (data < 0)
return data;
data &= ~mask;
data |= vsel;
return tps6507x_pmic_reg_write(tps, reg, data);
}
static int tps6507x_pmic_dcdc_list_voltage(struct regulator_dev *dev,
unsigned selector)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int dcdc = rdev_get_id(dev);
if (dcdc < TPS6507X_DCDC_1 || dcdc > TPS6507X_DCDC_3)
return -EINVAL;
if (selector >= tps->info[dcdc]->table_len)
return -EINVAL;
else
return tps->info[dcdc]->table[selector] * 1000;
}
static int tps6507x_pmic_ldo_list_voltage(struct regulator_dev *dev,
unsigned selector)
{
struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev);
if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
return -EINVAL;
if (selector >= tps->info[ldo]->table_len)
return -EINVAL;
else
return tps->info[ldo]->table[selector] * 1000;
}
/* Operations permitted on VDCDCx */
static struct regulator_ops tps6507x_pmic_dcdc_ops = {
.is_enabled = tps6507x_pmic_dcdc_is_enabled,
.enable = tps6507x_pmic_dcdc_enable,
.disable = tps6507x_pmic_dcdc_disable,
.get_voltage = tps6507x_pmic_dcdc_get_voltage,
.set_voltage = tps6507x_pmic_dcdc_set_voltage,
.list_voltage = tps6507x_pmic_dcdc_list_voltage,
};
/* Operations permitted on LDOx */
static struct regulator_ops tps6507x_pmic_ldo_ops = {
.is_enabled = tps6507x_pmic_ldo_is_enabled,
.enable = tps6507x_pmic_ldo_enable,
.disable = tps6507x_pmic_ldo_disable,
.get_voltage = tps6507x_pmic_ldo_get_voltage,
.set_voltage = tps6507x_pmic_ldo_set_voltage,
.list_voltage = tps6507x_pmic_ldo_list_voltage,
};
static __devinit
int tps6507x_pmic_probe(struct platform_device *pdev)
{
struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
static int desc_id;
struct tps_info *info = &tps6507x_pmic_regs[0];
struct regulator_init_data *init_data;
struct regulator_dev *rdev;
struct tps6507x_pmic *tps;
struct tps6507x_board *tps_board;
int i;
int error;
/**
* tps_board points to pmic related constants
* coming from the board-evm file.
*/
tps_board = dev_get_platdata(tps6507x_dev->dev);
if (!tps_board)
return -EINVAL;
/**
* init_data points to array of regulator_init structures
* coming from the board-evm file.
*/
init_data = tps_board->tps6507x_pmic_init_data;
if (!init_data)
return -EINVAL;
tps = kzalloc(sizeof(*tps), GFP_KERNEL);
if (!tps)
return -ENOMEM;
mutex_init(&tps->io_lock);
/* common for all regulators */
tps->mfd = tps6507x_dev;
for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++, init_data++) {
/* Register the regulators */
tps->info[i] = info;
if (init_data->driver_data) {
struct tps6507x_reg_platform_data *data =
init_data->driver_data;
tps->info[i]->defdcdc_default = data->defdcdc_default;
}
tps->desc[i].name = info->name;
tps->desc[i].id = desc_id++;
tps->desc[i].n_voltages = num_voltages[i];
tps->desc[i].ops = (i > TPS6507X_DCDC_3 ?
&tps6507x_pmic_ldo_ops : &tps6507x_pmic_dcdc_ops);
tps->desc[i].type = REGULATOR_VOLTAGE;
tps->desc[i].owner = THIS_MODULE;
rdev = regulator_register(&tps->desc[i],
tps6507x_dev->dev, init_data, tps);
if (IS_ERR(rdev)) {
dev_err(tps6507x_dev->dev,
"failed to register %s regulator\n",
pdev->name);
error = PTR_ERR(rdev);
goto fail;
}
/* Save regulator for cleanup */
tps->rdev[i] = rdev;
}
tps6507x_dev->pmic = tps;
return 0;
fail:
while (--i >= 0)
regulator_unregister(tps->rdev[i]);
kfree(tps);
return error;
}
/**
* tps6507x_remove - TPS6507x driver i2c remove handler
* @client: i2c driver client device structure
*
* Unregister TPS driver as an i2c client device driver
*/
static int __devexit tps6507x_pmic_remove(struct platform_device *pdev)
{
struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev);
struct tps6507x_pmic *tps = tps6507x_dev->pmic;
int i;
for (i = 0; i < TPS6507X_NUM_REGULATOR; i++)
regulator_unregister(tps->rdev[i]);
kfree(tps);
return 0;
}
static struct platform_driver tps6507x_pmic_driver = {
.driver = {
.name = "tps6507x-pmic",
.owner = THIS_MODULE,
},
.probe = tps6507x_pmic_probe,
.remove = __devexit_p(tps6507x_pmic_remove),
};
/**
* tps6507x_pmic_init
*
* Module init function
*/
static int __init tps6507x_pmic_init(void)
{
return platform_driver_register(&tps6507x_pmic_driver);
}
subsys_initcall(tps6507x_pmic_init);
/**
* tps6507x_pmic_cleanup
*
* Module exit function
*/
static void __exit tps6507x_pmic_cleanup(void)
{
platform_driver_unregister(&tps6507x_pmic_driver);
}
module_exit(tps6507x_pmic_cleanup);
MODULE_AUTHOR("Texas Instruments");
MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps6507x-pmic");
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