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linux-sg2042/drivers/regulator/tps6586x-regulator.c

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/*
* Regulator driver for TI TPS6586x
*
* Copyright (C) 2010 Compulab Ltd.
* Author: Mike Rapoport <mike@compulab.co.il>
*
* Based on da903x
* Copyright (C) 2006-2008 Marvell International Ltd.
* Copyright (C) 2008 Compulab Ltd.
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/tps6586x.h>
/* supply control and voltage setting */
#define TPS6586X_SUPPLYENA 0x10
#define TPS6586X_SUPPLYENB 0x11
#define TPS6586X_SUPPLYENC 0x12
#define TPS6586X_SUPPLYEND 0x13
#define TPS6586X_SUPPLYENE 0x14
#define TPS6586X_VCC1 0x20
#define TPS6586X_VCC2 0x21
#define TPS6586X_SM1V1 0x23
#define TPS6586X_SM1V2 0x24
#define TPS6586X_SM1SL 0x25
#define TPS6586X_SM0V1 0x26
#define TPS6586X_SM0V2 0x27
#define TPS6586X_SM0SL 0x28
#define TPS6586X_LDO2AV1 0x29
#define TPS6586X_LDO2AV2 0x2A
#define TPS6586X_LDO2BV1 0x2F
#define TPS6586X_LDO2BV2 0x30
#define TPS6586X_LDO4V1 0x32
#define TPS6586X_LDO4V2 0x33
/* converter settings */
#define TPS6586X_SUPPLYV1 0x41
#define TPS6586X_SUPPLYV2 0x42
#define TPS6586X_SUPPLYV3 0x43
#define TPS6586X_SUPPLYV4 0x44
#define TPS6586X_SUPPLYV5 0x45
#define TPS6586X_SUPPLYV6 0x46
#define TPS6586X_SMODE1 0x47
#define TPS6586X_SMODE2 0x48
struct tps6586x_regulator {
struct regulator_desc desc;
int volt_reg;
int volt_shift;
int volt_nbits;
int enable_bit[2];
int enable_reg[2];
int *voltages;
/* for DVM regulators */
int go_reg;
int go_bit;
};
static inline struct device *to_tps6586x_dev(struct regulator_dev *rdev)
{
return rdev_get_dev(rdev)->parent->parent;
}
static int tps6586x_list_voltage(struct regulator_dev *rdev, unsigned selector)
{
struct tps6586x_regulator *info = rdev_get_drvdata(rdev);
int rid = rdev_get_id(rdev);
/* LDO0 has minimal voltage 1.2V rather than 1.25V */
if ((rid == TPS6586X_ID_LDO_0) && (selector == 0))
return (info->voltages[0] - 50) * 1000;
return info->voltages[selector] * 1000;
}
static int tps6586x_set_voltage_sel(struct regulator_dev *rdev,
unsigned selector)
{
struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps6586x_dev(rdev);
int ret, val, rid = rdev_get_id(rdev);
uint8_t mask;
val = selector << ri->volt_shift;
mask = ((1 << ri->volt_nbits) - 1) << ri->volt_shift;
ret = tps6586x_update(parent, ri->volt_reg, val, mask);
if (ret)
return ret;
/* Update go bit for DVM regulators */
switch (rid) {
case TPS6586X_ID_LDO_2:
case TPS6586X_ID_LDO_4:
case TPS6586X_ID_SM_0:
case TPS6586X_ID_SM_1:
ret = tps6586x_set_bits(parent, ri->go_reg, 1 << ri->go_bit);
break;
}
return ret;
}
static int tps6586x_get_voltage_sel(struct regulator_dev *rdev)
{
struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps6586x_dev(rdev);
uint8_t val, mask;
int ret;
ret = tps6586x_read(parent, ri->volt_reg, &val);
if (ret)
return ret;
mask = ((1 << ri->volt_nbits) - 1) << ri->volt_shift;
val = (val & mask) >> ri->volt_shift;
if (val >= ri->desc.n_voltages)
BUG();
return val;
}
static int tps6586x_regulator_enable(struct regulator_dev *rdev)
{
struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps6586x_dev(rdev);
return tps6586x_set_bits(parent, ri->enable_reg[0],
1 << ri->enable_bit[0]);
}
static int tps6586x_regulator_disable(struct regulator_dev *rdev)
{
struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps6586x_dev(rdev);
return tps6586x_clr_bits(parent, ri->enable_reg[0],
1 << ri->enable_bit[0]);
}
static int tps6586x_regulator_is_enabled(struct regulator_dev *rdev)
{
struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps6586x_dev(rdev);
uint8_t reg_val;
int ret;
ret = tps6586x_read(parent, ri->enable_reg[0], &reg_val);
if (ret)
return ret;
return !!(reg_val & (1 << ri->enable_bit[0]));
}
static struct regulator_ops tps6586x_regulator_ops = {
.list_voltage = tps6586x_list_voltage,
.get_voltage_sel = tps6586x_get_voltage_sel,
.set_voltage_sel = tps6586x_set_voltage_sel,
.is_enabled = tps6586x_regulator_is_enabled,
.enable = tps6586x_regulator_enable,
.disable = tps6586x_regulator_disable,
};
static int tps6586x_ldo_voltages[] = {
1250, 1500, 1800, 2500, 2700, 2850, 3100, 3300,
};
static int tps6586x_ldo4_voltages[] = {
1700, 1725, 1750, 1775, 1800, 1825, 1850, 1875,
1900, 1925, 1950, 1975, 2000, 2025, 2050, 2075,
2100, 2125, 2150, 2175, 2200, 2225, 2250, 2275,
2300, 2325, 2350, 2375, 2400, 2425, 2450, 2475,
};
static int tps6586x_sm2_voltages[] = {
3000, 3050, 3100, 3150, 3200, 3250, 3300, 3350,
3400, 3450, 3500, 3550, 3600, 3650, 3700, 3750,
3800, 3850, 3900, 3950, 4000, 4050, 4100, 4150,
4200, 4250, 4300, 4350, 4400, 4450, 4500, 4550,
};
static int tps6586x_dvm_voltages[] = {
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,
};
#define TPS6586X_REGULATOR(_id, vdata, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1) \
.desc = { \
.name = "REG-" #_id, \
.ops = &tps6586x_regulator_ops, \
.type = REGULATOR_VOLTAGE, \
.id = TPS6586X_ID_##_id, \
.n_voltages = ARRAY_SIZE(tps6586x_##vdata##_voltages), \
.owner = THIS_MODULE, \
}, \
.volt_reg = TPS6586X_##vreg, \
.volt_shift = (shift), \
.volt_nbits = (nbits), \
.enable_reg[0] = TPS6586X_SUPPLY##ereg0, \
.enable_bit[0] = (ebit0), \
.enable_reg[1] = TPS6586X_SUPPLY##ereg1, \
.enable_bit[1] = (ebit1), \
.voltages = tps6586x_##vdata##_voltages,
#define TPS6586X_REGULATOR_DVM_GOREG(goreg, gobit) \
.go_reg = TPS6586X_##goreg, \
.go_bit = (gobit),
#define TPS6586X_LDO(_id, vdata, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1) \
{ \
TPS6586X_REGULATOR(_id, vdata, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1) \
}
#define TPS6586X_DVM(_id, vdata, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1, goreg, gobit) \
{ \
TPS6586X_REGULATOR(_id, vdata, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1) \
TPS6586X_REGULATOR_DVM_GOREG(goreg, gobit) \
}
static struct tps6586x_regulator tps6586x_regulator[] = {
TPS6586X_LDO(LDO_0, ldo, SUPPLYV1, 5, 3, ENC, 0, END, 0),
TPS6586X_LDO(LDO_3, ldo, SUPPLYV4, 0, 3, ENC, 2, END, 2),
TPS6586X_LDO(LDO_5, ldo, SUPPLYV6, 0, 3, ENE, 6, ENE, 6),
TPS6586X_LDO(LDO_6, ldo, SUPPLYV3, 0, 3, ENC, 4, END, 4),
TPS6586X_LDO(LDO_7, ldo, SUPPLYV3, 3, 3, ENC, 5, END, 5),
TPS6586X_LDO(LDO_8, ldo, SUPPLYV2, 5, 3, ENC, 6, END, 6),
TPS6586X_LDO(LDO_9, ldo, SUPPLYV6, 3, 3, ENE, 7, ENE, 7),
TPS6586X_LDO(LDO_RTC, ldo, SUPPLYV4, 3, 3, V4, 7, V4, 7),
TPS6586X_LDO(LDO_1, dvm, SUPPLYV1, 0, 5, ENC, 1, END, 1),
TPS6586X_LDO(SM_2, sm2, SUPPLYV2, 0, 5, ENC, 7, END, 7),
TPS6586X_DVM(LDO_2, dvm, LDO2BV1, 0, 5, ENA, 3, ENB, 3, VCC2, 6),
TPS6586X_DVM(LDO_4, ldo4, LDO4V1, 0, 5, ENC, 3, END, 3, VCC1, 6),
TPS6586X_DVM(SM_0, dvm, SM0V1, 0, 5, ENA, 1, ENB, 1, VCC1, 2),
TPS6586X_DVM(SM_1, dvm, SM1V1, 0, 5, ENA, 0, ENB, 0, VCC1, 0),
};
/*
* TPS6586X has 2 enable bits that are OR'ed to determine the actual
* regulator state. Clearing one of this bits allows switching
* regulator on and of with single register write.
*/
static inline int tps6586x_regulator_preinit(struct device *parent,
struct tps6586x_regulator *ri)
{
uint8_t val1, val2;
int ret;
if (ri->enable_reg[0] == ri->enable_reg[1] &&
ri->enable_bit[0] == ri->enable_bit[1])
return 0;
ret = tps6586x_read(parent, ri->enable_reg[0], &val1);
if (ret)
return ret;
ret = tps6586x_read(parent, ri->enable_reg[1], &val2);
if (ret)
return ret;
if (!(val2 & (1 << ri->enable_bit[1])))
return 0;
/*
* The regulator is on, but it's enabled with the bit we don't
* want to use, so we switch the enable bits
*/
if (!(val1 & (1 << ri->enable_bit[0]))) {
ret = tps6586x_set_bits(parent, ri->enable_reg[0],
1 << ri->enable_bit[0]);
if (ret)
return ret;
}
return tps6586x_clr_bits(parent, ri->enable_reg[1],
1 << ri->enable_bit[1]);
}
static int tps6586x_regulator_set_slew_rate(struct platform_device *pdev)
{
struct device *parent = pdev->dev.parent;
struct regulator_init_data *p = pdev->dev.platform_data;
struct tps6586x_settings *setting = p->driver_data;
uint8_t reg;
if (setting == NULL)
return 0;
if (!(setting->slew_rate & TPS6586X_SLEW_RATE_SET))
return 0;
/* only SM0 and SM1 can have the slew rate settings */
switch (pdev->id) {
case TPS6586X_ID_SM_0:
reg = TPS6586X_SM0SL;
break;
case TPS6586X_ID_SM_1:
reg = TPS6586X_SM1SL;
break;
default:
dev_warn(&pdev->dev, "Only SM0/SM1 can set slew rate\n");
return -EINVAL;
}
return tps6586x_write(parent, reg,
setting->slew_rate & TPS6586X_SLEW_RATE_MASK);
}
static inline struct tps6586x_regulator *find_regulator_info(int id)
{
struct tps6586x_regulator *ri;
int i;
for (i = 0; i < ARRAY_SIZE(tps6586x_regulator); i++) {
ri = &tps6586x_regulator[i];
if (ri->desc.id == id)
return ri;
}
return NULL;
}
static int __devinit tps6586x_regulator_probe(struct platform_device *pdev)
{
struct tps6586x_regulator *ri = NULL;
struct regulator_config config = { };
struct regulator_dev *rdev;
int id = pdev->id;
int err;
dev_dbg(&pdev->dev, "Probing regulator %d\n", id);
ri = find_regulator_info(id);
if (ri == NULL) {
dev_err(&pdev->dev, "invalid regulator ID specified\n");
return -EINVAL;
}
err = tps6586x_regulator_preinit(pdev->dev.parent, ri);
if (err)
return err;
config.dev = &pdev->dev;
config.of_node = pdev->dev.of_node;
config.init_data = pdev->dev.platform_data;
config.driver_data = ri;
rdev = regulator_register(&ri->desc, &config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "failed to register regulator %s\n",
ri->desc.name);
return PTR_ERR(rdev);
}
platform_set_drvdata(pdev, rdev);
return tps6586x_regulator_set_slew_rate(pdev);
}
static int __devexit tps6586x_regulator_remove(struct platform_device *pdev)
{
struct regulator_dev *rdev = platform_get_drvdata(pdev);
regulator_unregister(rdev);
return 0;
}
static struct platform_driver tps6586x_regulator_driver = {
.driver = {
.name = "tps6586x-regulator",
.owner = THIS_MODULE,
},
.probe = tps6586x_regulator_probe,
.remove = __devexit_p(tps6586x_regulator_remove),
};
static int __init tps6586x_regulator_init(void)
{
return platform_driver_register(&tps6586x_regulator_driver);
}
subsys_initcall(tps6586x_regulator_init);
static void __exit tps6586x_regulator_exit(void)
{
platform_driver_unregister(&tps6586x_regulator_driver);
}
module_exit(tps6586x_regulator_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
MODULE_DESCRIPTION("Regulator Driver for TI TPS6586X PMIC");
MODULE_ALIAS("platform:tps6586x-regulator");
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