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linux/drivers/regulator/tps6524x-regulator.c
Cyril Chemparathy 1394fd2826 regulator: add driver for tps6524x regulator 
TPS6524X provides three step-down converters and two general-purpose LDO
voltage regulators.  This device is interfaced using SPI.

Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2011-01-12 14:33:02 +00:00

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/*
* Regulator driver for TPS6524x PMIC
*
* Copyright (C) 2010 Texas Instruments
*
* 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/err.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#define REG_LDO_SET 0x0
#define LDO_ILIM_MASK 1 /* 0 = 400-800, 1 = 900-1500 */
#define LDO_VSEL_MASK 0x0f
#define LDO2_ILIM_SHIFT 12
#define LDO2_VSEL_SHIFT 4
#define LDO1_ILIM_SHIFT 8
#define LDO1_VSEL_SHIFT 0
#define REG_BLOCK_EN 0x1
#define BLOCK_MASK 1
#define BLOCK_LDO1_SHIFT 0
#define BLOCK_LDO2_SHIFT 1
#define BLOCK_LCD_SHIFT 2
#define BLOCK_USB_SHIFT 3
#define REG_DCDC_SET 0x2
#define DCDC_VDCDC_MASK 0x1f
#define DCDC_VDCDC1_SHIFT 0
#define DCDC_VDCDC2_SHIFT 5
#define DCDC_VDCDC3_SHIFT 10
#define REG_DCDC_EN 0x3
#define DCDCDCDC_EN_MASK 0x1
#define DCDCDCDC1_EN_SHIFT 0
#define DCDCDCDC1_PG_MSK BIT(1)
#define DCDCDCDC2_EN_SHIFT 2
#define DCDCDCDC2_PG_MSK BIT(3)
#define DCDCDCDC3_EN_SHIFT 4
#define DCDCDCDC3_PG_MSK BIT(5)
#define REG_USB 0x4
#define USB_ILIM_SHIFT 0
#define USB_ILIM_MASK 0x3
#define USB_TSD_SHIFT 2
#define USB_TSD_MASK 0x3
#define USB_TWARN_SHIFT 4
#define USB_TWARN_MASK 0x3
#define USB_IWARN_SD BIT(6)
#define USB_FAST_LOOP BIT(7)
#define REG_ALARM 0x5
#define ALARM_LDO1 BIT(0)
#define ALARM_DCDC1 BIT(1)
#define ALARM_DCDC2 BIT(2)
#define ALARM_DCDC3 BIT(3)
#define ALARM_LDO2 BIT(4)
#define ALARM_USB_WARN BIT(5)
#define ALARM_USB_ALARM BIT(6)
#define ALARM_LCD BIT(9)
#define ALARM_TEMP_WARM BIT(10)
#define ALARM_TEMP_HOT BIT(11)
#define ALARM_NRST BIT(14)
#define ALARM_POWERUP BIT(15)
#define REG_INT_ENABLE 0x6
#define INT_LDO1 BIT(0)
#define INT_DCDC1 BIT(1)
#define INT_DCDC2 BIT(2)
#define INT_DCDC3 BIT(3)
#define INT_LDO2 BIT(4)
#define INT_USB_WARN BIT(5)
#define INT_USB_ALARM BIT(6)
#define INT_LCD BIT(9)
#define INT_TEMP_WARM BIT(10)
#define INT_TEMP_HOT BIT(11)
#define INT_GLOBAL_EN BIT(15)
#define REG_INT_STATUS 0x7
#define STATUS_LDO1 BIT(0)
#define STATUS_DCDC1 BIT(1)
#define STATUS_DCDC2 BIT(2)
#define STATUS_DCDC3 BIT(3)
#define STATUS_LDO2 BIT(4)
#define STATUS_USB_WARN BIT(5)
#define STATUS_USB_ALARM BIT(6)
#define STATUS_LCD BIT(9)
#define STATUS_TEMP_WARM BIT(10)
#define STATUS_TEMP_HOT BIT(11)
#define REG_SOFTWARE_RESET 0xb
#define REG_WRITE_ENABLE 0xd
#define REG_REV_ID 0xf
#define N_DCDC 3
#define N_LDO 2
#define N_SWITCH 2
#define N_REGULATORS (3 /* DCDC */ + \
2 /* LDO */ + \
2 /* switch */)
#define FIXED_ILIMSEL BIT(0)
#define FIXED_VOLTAGE BIT(1)
#define CMD_READ(reg) ((reg) << 6)
#define CMD_WRITE(reg) (BIT(5) | (reg) << 6)
#define STAT_CLK BIT(3)
#define STAT_WRITE BIT(2)
#define STAT_INVALID BIT(1)
#define STAT_WP BIT(0)
struct field {
int reg;
int shift;
int mask;
};
struct supply_info {
const char *name;
int n_voltages;
const int *voltages;
int fixed_voltage;
int n_ilimsels;
const int *ilimsels;
int fixed_ilimsel;
int flags;
struct field enable, voltage, ilimsel;
};
struct tps6524x {
struct device *dev;
struct spi_device *spi;
struct mutex lock;
struct regulator_desc desc[N_REGULATORS];
struct regulator_dev *rdev[N_REGULATORS];
};
static int __read_reg(struct tps6524x *hw, int reg)
{
int error = 0;
u16 cmd = CMD_READ(reg), in;
u8 status;
struct spi_message m;
struct spi_transfer t[3];
spi_message_init(&m);
memset(t, 0, sizeof(t));
t[0].tx_buf = &cmd;
t[0].len = 2;
t[0].bits_per_word = 12;
spi_message_add_tail(&t[0], &m);
t[1].rx_buf = &in;
t[1].len = 2;
t[1].bits_per_word = 16;
spi_message_add_tail(&t[1], &m);
t[2].rx_buf = &status;
t[2].len = 1;
t[2].bits_per_word = 4;
spi_message_add_tail(&t[2], &m);
error = spi_sync(hw->spi, &m);
if (error < 0)
return error;
dev_dbg(hw->dev, "read reg %d, data %x, status %x\n",
reg, in, status);
if (!(status & STAT_CLK) || (status & STAT_WRITE))
return -EIO;
if (status & STAT_INVALID)
return -EINVAL;
return in;
}
static int read_reg(struct tps6524x *hw, int reg)
{
int ret;
mutex_lock(&hw->lock);
ret = __read_reg(hw, reg);
mutex_unlock(&hw->lock);
return ret;
}
static int __write_reg(struct tps6524x *hw, int reg, int val)
{
int error = 0;
u16 cmd = CMD_WRITE(reg), out = val;
u8 status;
struct spi_message m;
struct spi_transfer t[3];
spi_message_init(&m);
memset(t, 0, sizeof(t));
t[0].tx_buf = &cmd;
t[0].len = 2;
t[0].bits_per_word = 12;
spi_message_add_tail(&t[0], &m);
t[1].tx_buf = &out;
t[1].len = 2;
t[1].bits_per_word = 16;
spi_message_add_tail(&t[1], &m);
t[2].rx_buf = &status;
t[2].len = 1;
t[2].bits_per_word = 4;
spi_message_add_tail(&t[2], &m);
error = spi_sync(hw->spi, &m);
if (error < 0)
return error;
dev_dbg(hw->dev, "wrote reg %d, data %x, status %x\n",
reg, out, status);
if (!(status & STAT_CLK) || !(status & STAT_WRITE))
return -EIO;
if (status & (STAT_INVALID | STAT_WP))
return -EINVAL;
return error;
}
static int __rmw_reg(struct tps6524x *hw, int reg, int mask, int val)
{
int ret;
ret = __read_reg(hw, reg);
if (ret < 0)
return ret;
ret &= ~mask;
ret |= val;
ret = __write_reg(hw, reg, ret);
return (ret < 0) ? ret : 0;
}
static int rmw_protect(struct tps6524x *hw, int reg, int mask, int val)
{
int ret;
mutex_lock(&hw->lock);
ret = __write_reg(hw, REG_WRITE_ENABLE, 1);
if (ret) {
dev_err(hw->dev, "failed to set write enable\n");
goto error;
}
ret = __rmw_reg(hw, reg, mask, val);
if (ret)
dev_err(hw->dev, "failed to rmw register %d\n", reg);
ret = __write_reg(hw, REG_WRITE_ENABLE, 0);
if (ret) {
dev_err(hw->dev, "failed to clear write enable\n");
goto error;
}
error:
mutex_unlock(&hw->lock);
return ret;
}
static int read_field(struct tps6524x *hw, const struct field *field)
{
int tmp;
tmp = read_reg(hw, field->reg);
if (tmp < 0)
return tmp;
return (tmp >> field->shift) & field->mask;
}
static int write_field(struct tps6524x *hw, const struct field *field,
int val)
{
if (val & ~field->mask)
return -EOVERFLOW;
return rmw_protect(hw, field->reg,
field->mask << field->shift,
val << field->shift);
}
static const int dcdc1_voltages[] = {
800000, 825000, 850000, 875000,
900000, 925000, 950000, 975000,
1000000, 1025000, 1050000, 1075000,
1100000, 1125000, 1150000, 1175000,
1200000, 1225000, 1250000, 1275000,
1300000, 1325000, 1350000, 1375000,
1400000, 1425000, 1450000, 1475000,
1500000, 1525000, 1550000, 1575000,
};
static const int dcdc2_voltages[] = {
1400000, 1450000, 1500000, 1550000,
1600000, 1650000, 1700000, 1750000,
1800000, 1850000, 1900000, 1950000,
2000000, 2050000, 2100000, 2150000,
2200000, 2250000, 2300000, 2350000,
2400000, 2450000, 2500000, 2550000,
2600000, 2650000, 2700000, 2750000,
2800000, 2850000, 2900000, 2950000,
};
static const int dcdc3_voltages[] = {
2400000, 2450000, 2500000, 2550000, 2600000,
2650000, 2700000, 2750000, 2800000, 2850000,
2900000, 2950000, 3000000, 3050000, 3100000,
3150000, 3200000, 3250000, 3300000, 3350000,
3400000, 3450000, 3500000, 3550000, 3600000,
};
static const int ldo1_voltages[] = {
4300000, 4350000, 4400000, 4450000,
4500000, 4550000, 4600000, 4650000,
4700000, 4750000, 4800000, 4850000,
4900000, 4950000, 5000000, 5050000,
};
static const int ldo2_voltages[] = {
1100000, 1150000, 1200000, 1250000,
1300000, 1700000, 1750000, 1800000,
1850000, 1900000, 3150000, 3200000,
3250000, 3300000, 3350000, 3400000,
};
static const int ldo_ilimsel[] = {
400000, 1500000
};
static const int usb_ilimsel[] = {
200000, 400000, 800000, 1000000
};
#define __MK_FIELD(_reg, _mask, _shift) \
{ .reg = (_reg), .mask = (_mask), .shift = (_shift), }
static const struct supply_info supply_info[N_REGULATORS] = {
{
.name = "DCDC1",
.flags = FIXED_ILIMSEL,
.n_voltages = ARRAY_SIZE(dcdc1_voltages),
.voltages = dcdc1_voltages,
.fixed_ilimsel = 2400000,
.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
DCDCDCDC1_EN_SHIFT),
.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
DCDC_VDCDC1_SHIFT),
},
{
.name = "DCDC2",
.flags = FIXED_ILIMSEL,
.n_voltages = ARRAY_SIZE(dcdc2_voltages),
.voltages = dcdc2_voltages,
.fixed_ilimsel = 1200000,
.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
DCDCDCDC2_EN_SHIFT),
.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
DCDC_VDCDC2_SHIFT),
},
{
.name = "DCDC3",
.flags = FIXED_ILIMSEL,
.n_voltages = ARRAY_SIZE(dcdc3_voltages),
.voltages = dcdc3_voltages,
.fixed_ilimsel = 1200000,
.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
DCDCDCDC3_EN_SHIFT),
.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
DCDC_VDCDC3_SHIFT),
},
{
.name = "LDO1",
.n_voltages = ARRAY_SIZE(ldo1_voltages),
.voltages = ldo1_voltages,
.n_ilimsels = ARRAY_SIZE(ldo_ilimsel),
.ilimsels = ldo_ilimsel,
.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
BLOCK_LDO1_SHIFT),
.voltage = __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
LDO1_VSEL_SHIFT),
.ilimsel = __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
LDO1_ILIM_SHIFT),
},
{
.name = "LDO2",
.n_voltages = ARRAY_SIZE(ldo2_voltages),
.voltages = ldo2_voltages,
.n_ilimsels = ARRAY_SIZE(ldo_ilimsel),
.ilimsels = ldo_ilimsel,
.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
BLOCK_LDO2_SHIFT),
.voltage = __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
LDO2_VSEL_SHIFT),
.ilimsel = __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
LDO2_ILIM_SHIFT),
},
{
.name = "USB",
.flags = FIXED_VOLTAGE,
.fixed_voltage = 5000000,
.n_ilimsels = ARRAY_SIZE(usb_ilimsel),
.ilimsels = usb_ilimsel,
.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
BLOCK_USB_SHIFT),
.ilimsel = __MK_FIELD(REG_USB, USB_ILIM_MASK,
USB_ILIM_SHIFT),
},
{
.name = "LCD",
.flags = FIXED_VOLTAGE | FIXED_ILIMSEL,
.fixed_voltage = 5000000,
.fixed_ilimsel = 400000,
.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
BLOCK_LCD_SHIFT),
},
};
static int list_voltage(struct regulator_dev *rdev, unsigned selector)
{
const struct supply_info *info;
struct tps6524x *hw;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
if (info->flags & FIXED_VOLTAGE)
return selector ? -EINVAL : info->fixed_voltage;
return ((selector < info->n_voltages) ?
info->voltages[selector] : -EINVAL);
}
static int set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
unsigned *selector)
{
const struct supply_info *info;
struct tps6524x *hw;
unsigned i;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
if (info->flags & FIXED_VOLTAGE)
return -EINVAL;
for (i = 0; i < info->n_voltages; i++)
if (min_uV <= info->voltages[i] &&
max_uV >= info->voltages[i])
break;
if (i >= info->n_voltages)
i = info->n_voltages - 1;
*selector = info->voltages[i];
return write_field(hw, &info->voltage, i);
}
static int get_voltage(struct regulator_dev *rdev)
{
const struct supply_info *info;
struct tps6524x *hw;
int ret;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
if (info->flags & FIXED_VOLTAGE)
return info->fixed_voltage;
ret = read_field(hw, &info->voltage);
if (ret < 0)
return ret;
if (WARN_ON(ret >= info->n_voltages))
return -EIO;
return info->voltages[ret];
}
static int set_current_limit(struct regulator_dev *rdev, int min_uA,
int max_uA)
{
const struct supply_info *info;
struct tps6524x *hw;
int i;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
if (info->flags & FIXED_ILIMSEL)
return -EINVAL;
for (i = 0; i < info->n_ilimsels; i++)
if (min_uA <= info->ilimsels[i] &&
max_uA >= info->ilimsels[i])
break;
if (i >= info->n_ilimsels)
return -EINVAL;
return write_field(hw, &info->ilimsel, i);
}
static int get_current_limit(struct regulator_dev *rdev)
{
const struct supply_info *info;
struct tps6524x *hw;
int ret;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
if (info->flags & FIXED_ILIMSEL)
return info->fixed_ilimsel;
ret = read_field(hw, &info->ilimsel);
if (ret < 0)
return ret;
if (WARN_ON(ret >= info->n_ilimsels))
return -EIO;
return info->ilimsels[ret];
}
static int enable_supply(struct regulator_dev *rdev)
{
const struct supply_info *info;
struct tps6524x *hw;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
return write_field(hw, &info->enable, 1);
}
static int disable_supply(struct regulator_dev *rdev)
{
const struct supply_info *info;
struct tps6524x *hw;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
return write_field(hw, &info->enable, 0);
}
static int is_supply_enabled(struct regulator_dev *rdev)
{
const struct supply_info *info;
struct tps6524x *hw;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
return read_field(hw, &info->enable);
}
static struct regulator_ops regulator_ops = {
.is_enabled = is_supply_enabled,
.enable = enable_supply,
.disable = disable_supply,
.get_voltage = get_voltage,
.set_voltage = set_voltage,
.list_voltage = list_voltage,
.set_current_limit = set_current_limit,
.get_current_limit = get_current_limit,
};
static int __devexit pmic_remove(struct spi_device *spi)
{
struct tps6524x *hw = spi_get_drvdata(spi);
int i;
if (!hw)
return 0;
for (i = 0; i < N_REGULATORS; i++) {
if (hw->rdev[i])
regulator_unregister(hw->rdev[i]);
hw->rdev[i] = NULL;
}
spi_set_drvdata(spi, NULL);
kfree(hw);
return 0;
}
static int __devinit pmic_probe(struct spi_device *spi)
{
struct tps6524x *hw;
struct device *dev = &spi->dev;
const struct supply_info *info = supply_info;
struct regulator_init_data *init_data;
int ret = 0, i;
init_data = dev->platform_data;
if (!init_data) {
dev_err(dev, "could not find regulator platform data\n");
return -EINVAL;
}
hw = kzalloc(sizeof(struct tps6524x), GFP_KERNEL);
if (!hw) {
dev_err(dev, "cannot allocate regulator private data\n");
return -ENOMEM;
}
spi_set_drvdata(spi, hw);
memset(hw, 0, sizeof(struct tps6524x));
hw->dev = dev;
hw->spi = spi_dev_get(spi);
mutex_init(&hw->lock);
for (i = 0; i < N_REGULATORS; i++, info++, init_data++) {
hw->desc[i].name = info->name;
hw->desc[i].id = i;
hw->desc[i].n_voltages = info->n_voltages;
hw->desc[i].ops = &regulator_ops;
hw->desc[i].type = REGULATOR_VOLTAGE;
hw->desc[i].owner = THIS_MODULE;
if (info->flags & FIXED_VOLTAGE)
hw->desc[i].n_voltages = 1;
hw->rdev[i] = regulator_register(&hw->desc[i], dev,
init_data, hw);
if (IS_ERR(hw->rdev[i])) {
ret = PTR_ERR(hw->rdev[i]);
hw->rdev[i] = NULL;
goto fail;
}
}
return 0;
fail:
pmic_remove(spi);
return ret;
}
static struct spi_driver pmic_driver = {
.probe = pmic_probe,
.remove = __devexit_p(pmic_remove),
.driver = {
.name = "tps6524x",
.owner = THIS_MODULE,
},
};
static int __init pmic_driver_init(void)
{
return spi_register_driver(&pmic_driver);
}
module_init(pmic_driver_init);
static void __exit pmic_driver_exit(void)
{
spi_unregister_driver(&pmic_driver);
}
module_exit(pmic_driver_exit);
MODULE_DESCRIPTION("TPS6524X PMIC Driver");
MODULE_AUTHOR("Cyril Chemparathy");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:tps6524x");
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