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acrn-kernel/drivers/regulator/lm363x-regulator.c

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/*
* TI LM363X Regulator Driver
*
* Copyright 2015 Texas Instruments
*
* Author: Milo Kim <milo.kim@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/err.h>
#include <linux/kernel.h>
#include <linux/mfd/ti-lmu.h>
#include <linux/mfd/ti-lmu-register.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/slab.h>
/* LM3631 */
#define LM3631_BOOST_VSEL_MAX 0x25
#define LM3631_LDO_VSEL_MAX 0x28
#define LM3631_CONT_VSEL_MAX 0x03
#define LM3631_VBOOST_MIN 4500000
#define LM3631_VCONT_MIN 1800000
#define LM3631_VLDO_MIN 4000000
#define ENABLE_TIME_USEC 1000
/* LM3632 */
#define LM3632_BOOST_VSEL_MAX 0x26
#define LM3632_LDO_VSEL_MAX 0x29
#define LM3632_VBOOST_MIN 4500000
#define LM3632_VLDO_MIN 4000000
/* Common */
#define LM363X_STEP_50mV 50000
#define LM363X_STEP_500mV 500000
static const int ldo_cont_enable_time[] = {
0, 2000, 5000, 10000, 20000, 50000, 100000, 200000,
};
static int lm363x_regulator_enable_time(struct regulator_dev *rdev)
{
enum lm363x_regulator_id id = rdev_get_id(rdev);
u8 val, addr, mask;
switch (id) {
case LM3631_LDO_CONT:
addr = LM3631_REG_ENTIME_VCONT;
mask = LM3631_ENTIME_CONT_MASK;
break;
case LM3631_LDO_OREF:
addr = LM3631_REG_ENTIME_VOREF;
mask = LM3631_ENTIME_MASK;
break;
case LM3631_LDO_POS:
addr = LM3631_REG_ENTIME_VPOS;
mask = LM3631_ENTIME_MASK;
break;
case LM3631_LDO_NEG:
addr = LM3631_REG_ENTIME_VNEG;
mask = LM3631_ENTIME_MASK;
break;
default:
return 0;
}
if (regmap_read(rdev->regmap, addr, (unsigned int *)&val))
return -EINVAL;
val = (val & mask) >> LM3631_ENTIME_SHIFT;
if (id == LM3631_LDO_CONT)
return ldo_cont_enable_time[val];
else
return ENABLE_TIME_USEC * val;
}
static struct regulator_ops lm363x_boost_voltage_table_ops = {
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
};
static struct regulator_ops lm363x_regulator_voltage_table_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 = lm363x_regulator_enable_time,
};
static const struct regulator_desc lm363x_regulator_desc[] = {
/* LM3631 */
{
.name = "vboost",
.of_match = "vboost",
.id = LM3631_BOOST,
.ops = &lm363x_boost_voltage_table_ops,
.n_voltages = LM3631_BOOST_VSEL_MAX + 1,
.min_uV = LM3631_VBOOST_MIN,
.uV_step = LM363X_STEP_50mV,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LM3631_REG_VOUT_BOOST,
.vsel_mask = LM3631_VOUT_MASK,
},
{
.name = "ldo_cont",
.of_match = "vcont",
.id = LM3631_LDO_CONT,
.ops = &lm363x_regulator_voltage_table_ops,
.n_voltages = LM3631_CONT_VSEL_MAX + 1,
.min_uV = LM3631_VCONT_MIN,
.uV_step = LM363X_STEP_500mV,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LM3631_REG_VOUT_CONT,
.vsel_mask = LM3631_VOUT_CONT_MASK,
.enable_reg = LM3631_REG_LDO_CTRL2,
.enable_mask = LM3631_EN_CONT_MASK,
},
{
.name = "ldo_oref",
.of_match = "voref",
.id = LM3631_LDO_OREF,
.ops = &lm363x_regulator_voltage_table_ops,
.n_voltages = LM3631_LDO_VSEL_MAX + 1,
.min_uV = LM3631_VLDO_MIN,
.uV_step = LM363X_STEP_50mV,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LM3631_REG_VOUT_OREF,
.vsel_mask = LM3631_VOUT_MASK,
.enable_reg = LM3631_REG_LDO_CTRL1,
.enable_mask = LM3631_EN_OREF_MASK,
},
{
.name = "ldo_vpos",
.of_match = "vpos",
.id = LM3631_LDO_POS,
.ops = &lm363x_regulator_voltage_table_ops,
.n_voltages = LM3631_LDO_VSEL_MAX + 1,
.min_uV = LM3631_VLDO_MIN,
.uV_step = LM363X_STEP_50mV,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LM3631_REG_VOUT_POS,
.vsel_mask = LM3631_VOUT_MASK,
.enable_reg = LM3631_REG_LDO_CTRL1,
.enable_mask = LM3631_EN_VPOS_MASK,
},
{
.name = "ldo_vneg",
.of_match = "vneg",
.id = LM3631_LDO_NEG,
.ops = &lm363x_regulator_voltage_table_ops,
.n_voltages = LM3631_LDO_VSEL_MAX + 1,
.min_uV = LM3631_VLDO_MIN,
.uV_step = LM363X_STEP_50mV,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LM3631_REG_VOUT_NEG,
.vsel_mask = LM3631_VOUT_MASK,
.enable_reg = LM3631_REG_LDO_CTRL1,
.enable_mask = LM3631_EN_VNEG_MASK,
},
/* LM3632 */
{
.name = "vboost",
.of_match = "vboost",
.id = LM3632_BOOST,
.ops = &lm363x_boost_voltage_table_ops,
.n_voltages = LM3632_BOOST_VSEL_MAX + 1,
.min_uV = LM3632_VBOOST_MIN,
.uV_step = LM363X_STEP_50mV,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LM3632_REG_VOUT_BOOST,
.vsel_mask = LM3632_VOUT_MASK,
},
{
.name = "ldo_vpos",
.of_match = "vpos",
.id = LM3632_LDO_POS,
.ops = &lm363x_regulator_voltage_table_ops,
.n_voltages = LM3632_LDO_VSEL_MAX + 1,
.min_uV = LM3632_VLDO_MIN,
.uV_step = LM363X_STEP_50mV,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LM3632_REG_VOUT_POS,
.vsel_mask = LM3632_VOUT_MASK,
.enable_reg = LM3632_REG_BIAS_CONFIG,
.enable_mask = LM3632_EN_VPOS_MASK,
},
{
.name = "ldo_vneg",
.of_match = "vneg",
.id = LM3632_LDO_NEG,
.ops = &lm363x_regulator_voltage_table_ops,
.n_voltages = LM3632_LDO_VSEL_MAX + 1,
.min_uV = LM3632_VLDO_MIN,
.uV_step = LM363X_STEP_50mV,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LM3632_REG_VOUT_NEG,
.vsel_mask = LM3632_VOUT_MASK,
.enable_reg = LM3632_REG_BIAS_CONFIG,
.enable_mask = LM3632_EN_VNEG_MASK,
},
};
static int lm363x_regulator_of_get_enable_gpio(struct device_node *np, int id)
{
/*
* Check LCM_EN1/2_GPIO is configured.
* Those pins are used for enabling VPOS/VNEG LDOs.
*/
switch (id) {
case LM3632_LDO_POS:
return of_get_named_gpio(np, "ti,lcm-en1-gpio", 0);
case LM3632_LDO_NEG:
return of_get_named_gpio(np, "ti,lcm-en2-gpio", 0);
default:
return -EINVAL;
}
}
static int lm363x_regulator_probe(struct platform_device *pdev)
{
struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
struct regmap *regmap = lmu->regmap;
struct regulator_config cfg = { };
struct regulator_dev *rdev;
struct device *dev = &pdev->dev;
int id = pdev->id;
int ret, ena_gpio;
cfg.dev = dev;
cfg.regmap = regmap;
/*
* LM3632 LDOs can be controlled by external pin.
* Register update is required if the pin is used.
*/
ena_gpio = lm363x_regulator_of_get_enable_gpio(dev->of_node, id);
if (gpio_is_valid(ena_gpio)) {
cfg.ena_gpio = ena_gpio;
cfg.ena_gpio_flags = GPIOF_OUT_INIT_LOW;
ret = regmap_update_bits(regmap, LM3632_REG_BIAS_CONFIG,
LM3632_EXT_EN_MASK,
LM3632_EXT_EN_MASK);
if (ret) {
dev_err(dev, "External pin err: %d\n", ret);
return ret;
}
}
rdev = devm_regulator_register(dev, &lm363x_regulator_desc[id], &cfg);
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
dev_err(dev, "[%d] regulator register err: %d\n", id, ret);
return ret;
}
return 0;
}
static struct platform_driver lm363x_regulator_driver = {
.probe = lm363x_regulator_probe,
.driver = {
.name = "lm363x-regulator",
},
};
module_platform_driver(lm363x_regulator_driver);
MODULE_DESCRIPTION("TI LM363X Regulator Driver");
MODULE_AUTHOR("Milo Kim");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:lm363x-regulator");
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