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linux/drivers/regulator/rt5120-regulator.c
ChiYuan Huang c0216c0e68
regulator: rt5120: Add PMIC regulator support 
Add RT5120 PMIC regulator support.

It integrates 4 buck convertes, 1 LDO voltage regulator, 1 external
enable signal to control the external power source.

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1655892104-10874-4-git-send-email-u0084500@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2022-06-23 13:07:50 +01:00

421 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
#include <linux/bits.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#define RT5120_REG_PGSTAT 0x03
#define RT5120_REG_CH1VID 0x06
#define RT5120_REG_CH1SLPVID 0x07
#define RT5120_REG_ENABLE 0x08
#define RT5120_REG_MODECTL 0x09
#define RT5120_REG_UVOVPROT 0x0A
#define RT5120_REG_SLPCTL 0x0C
#define RT5120_REG_INTSTAT 0x1E
#define RT5120_REG_DISCHG 0x1F
#define RT5120_OUTPG_MASK(rid) BIT(rid + 1)
#define RT5120_OUTUV_MASK(rid) BIT(rid + 9)
#define RT5120_OUTOV_MASK(rid) BIT(rid + 16)
#define RT5120_CH1VID_MASK GENMASK(6, 0)
#define RT5120_RIDEN_MASK(rid) BIT(rid + 1)
#define RT5120_RADEN_MASK(rid) BIT(rid)
#define RT5120_FPWM_MASK(rid) BIT(rid + 1)
#define RT5120_UVHICCUP_MASK BIT(1)
#define RT5120_OVHICCUP_MASK BIT(0)
#define RT5120_HOTDIE_MASK BIT(1)
#define RT5120_BUCK1_MINUV 600000
#define RT5120_BUCK1_MAXUV 1393750
#define RT5120_BUCK1_STEPUV 6250
#define RT5120_BUCK1_NUM_VOLT 0x80
#define RT5120_AUTO_MODE 0
#define RT5120_FPWM_MODE 1
enum {
RT5120_REGULATOR_BUCK1 = 0,
RT5120_REGULATOR_BUCK2,
RT5120_REGULATOR_BUCK3,
RT5120_REGULATOR_BUCK4,
RT5120_REGULATOR_LDO,
RT5120_REGULATOR_EXTEN,
RT5120_MAX_REGULATOR
};
struct rt5120_priv {
struct device *dev;
struct regmap *regmap;
struct regulator_desc rdesc[RT5120_MAX_REGULATOR];
};
static int rt5120_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct regmap *regmap = rdev_get_regmap(rdev);
int rid = rdev_get_id(rdev);
unsigned int mask = RT5120_FPWM_MASK(rid), val;
switch (mode) {
case REGULATOR_MODE_NORMAL:
val = 0;
break;
case REGULATOR_MODE_FAST:
val = RT5120_FPWM_MASK(rid);
break;
default:
return -EINVAL;
}
return regmap_update_bits(regmap, RT5120_REG_MODECTL, mask, val);
}
static unsigned int rt5120_buck_get_mode(struct regulator_dev *rdev)
{
struct regmap *regmap = rdev_get_regmap(rdev);
int ret, rid = rdev_get_id(rdev);
unsigned int val;
ret = regmap_read(regmap, RT5120_REG_MODECTL, &val);
if (ret)
return REGULATOR_MODE_INVALID;
if (val & RT5120_FPWM_MASK(rid))
return REGULATOR_MODE_FAST;
return REGULATOR_MODE_NORMAL;
}
static int rt5120_regulator_get_error_flags(struct regulator_dev *rdev,
unsigned int *flags)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int stat, hd_stat, cur_flags = 0;
int rid = rdev_get_id(rdev), ret;
/*
* reg 0x03/0x04/0x05 to indicate PG/UV/OV
* use block read to descrease I/O xfer time
*/
ret = regmap_raw_read(regmap, RT5120_REG_PGSTAT, &stat, 3);
if (ret)
return ret;
ret = regmap_read(regmap, RT5120_REG_INTSTAT, &hd_stat);
if (ret)
return ret;
if (!(stat & RT5120_OUTPG_MASK(rid))) {
if (stat & RT5120_OUTUV_MASK(rid))
cur_flags |= REGULATOR_ERROR_UNDER_VOLTAGE;
if (stat & RT5120_OUTOV_MASK(rid))
cur_flags |= REGULATOR_ERROR_REGULATION_OUT;
}
if (hd_stat & RT5120_HOTDIE_MASK)
cur_flags |= REGULATOR_ERROR_OVER_TEMP;
*flags = cur_flags;
return 0;
}
static int rt5120_buck1_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
struct regmap *regmap = rdev_get_regmap(rdev);
int sel;
if (uV < RT5120_BUCK1_MINUV || uV > RT5120_BUCK1_MAXUV)
return -EINVAL;
sel = (uV - RT5120_BUCK1_MINUV) / RT5120_BUCK1_STEPUV;
return regmap_write(regmap, RT5120_REG_CH1SLPVID, sel);
}
static int rt5120_regulator_set_suspend_enable(struct regulator_dev *rdev)
{
struct regmap *regmap = rdev_get_regmap(rdev);
int rid = rdev_get_id(rdev);
unsigned int mask = RT5120_RIDEN_MASK(rid);
return regmap_update_bits(regmap, RT5120_REG_SLPCTL, mask, mask);
}
static int rt5120_regulator_set_suspend_disable(struct regulator_dev *rdev)
{
struct regmap *regmap = rdev_get_regmap(rdev);
int rid = rdev_get_id(rdev);
unsigned int mask = RT5120_RIDEN_MASK(rid);
return regmap_update_bits(regmap, RT5120_REG_SLPCTL, mask, 0);
}
static const struct regulator_ops rt5120_buck1_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
.set_mode = rt5120_buck_set_mode,
.get_mode = rt5120_buck_get_mode,
.get_error_flags = rt5120_regulator_get_error_flags,
.set_suspend_voltage = rt5120_buck1_set_suspend_voltage,
.set_suspend_enable = rt5120_regulator_set_suspend_enable,
.set_suspend_disable = rt5120_regulator_set_suspend_disable,
};
static const struct regulator_ops rt5120_buck234_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
.set_mode = rt5120_buck_set_mode,
.get_mode = rt5120_buck_get_mode,
.get_error_flags = rt5120_regulator_get_error_flags,
.set_suspend_enable = rt5120_regulator_set_suspend_enable,
.set_suspend_disable = rt5120_regulator_set_suspend_disable,
};
static const struct regulator_ops rt5120_ldo_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
.get_error_flags = rt5120_regulator_get_error_flags,
.set_suspend_enable = rt5120_regulator_set_suspend_enable,
.set_suspend_disable = rt5120_regulator_set_suspend_disable,
};
static const struct regulator_ops rt5120_exten_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_suspend_enable = rt5120_regulator_set_suspend_enable,
.set_suspend_disable = rt5120_regulator_set_suspend_disable,
};
static unsigned int rt5120_buck_of_map_mode(unsigned int mode)
{
switch (mode) {
case RT5120_AUTO_MODE:
return REGULATOR_MODE_NORMAL;
case RT5120_FPWM_MODE:
return REGULATOR_MODE_FAST;
default:
return REGULATOR_MODE_INVALID;
}
}
static void rt5120_fillin_regulator_desc(struct regulator_desc *desc, int rid)
{
static const char * const name[] = {
"buck1", "buck2", "buck3", "buck4", "ldo", "exten" };
static const char * const sname[] = {
"vin1", "vin2", "vin3", "vin4", "vinldo", NULL };
/* Common regulator property */
desc->name = name[rid];
desc->supply_name = sname[rid];
desc->owner = THIS_MODULE;
desc->type = REGULATOR_VOLTAGE;
desc->id = rid;
desc->enable_reg = RT5120_REG_ENABLE;
desc->enable_mask = RT5120_RIDEN_MASK(rid);
desc->active_discharge_reg = RT5120_REG_DISCHG;
desc->active_discharge_mask = RT5120_RADEN_MASK(rid);
desc->active_discharge_on = RT5120_RADEN_MASK(rid);
/* Config n_voltages to 1 for all*/
desc->n_voltages = 1;
/* Only buck support mode change */
if (rid >= RT5120_REGULATOR_BUCK1 && rid <= RT5120_REGULATOR_BUCK4)
desc->of_map_mode = rt5120_buck_of_map_mode;
/* RID specific property init */
switch (rid) {
case RT5120_REGULATOR_BUCK1:
/* Only buck1 support voltage change by I2C */
desc->n_voltages = RT5120_BUCK1_NUM_VOLT;
desc->min_uV = RT5120_BUCK1_MINUV;
desc->uV_step = RT5120_BUCK1_STEPUV;
desc->vsel_reg = RT5120_REG_CH1VID,
desc->vsel_mask = RT5120_CH1VID_MASK,
desc->ops = &rt5120_buck1_ops;
break;
case RT5120_REGULATOR_BUCK2 ... RT5120_REGULATOR_BUCK4:
desc->ops = &rt5120_buck234_ops;
break;
case RT5120_REGULATOR_LDO:
desc->ops = &rt5120_ldo_ops;
break;
default:
desc->ops = &rt5120_exten_ops;
}
}
static int rt5120_of_parse_cb(struct rt5120_priv *priv, int rid,
struct of_regulator_match *match)
{
struct regulator_desc *desc = priv->rdesc + rid;
struct regulator_init_data *init_data = match->init_data;
if (!init_data || rid == RT5120_REGULATOR_BUCK1)
return 0;
if (init_data->constraints.min_uV != init_data->constraints.max_uV) {
dev_err(priv->dev, "Variable voltage for fixed regulator\n");
return -EINVAL;
}
desc->fixed_uV = init_data->constraints.min_uV;
return 0;
}
static struct of_regulator_match rt5120_regu_match[RT5120_MAX_REGULATOR] = {
[RT5120_REGULATOR_BUCK1] = { .name = "buck1", },
[RT5120_REGULATOR_BUCK2] = { .name = "buck2", },
[RT5120_REGULATOR_BUCK3] = { .name = "buck3", },
[RT5120_REGULATOR_BUCK4] = { .name = "buck4", },
[RT5120_REGULATOR_LDO] = { .name = "ldo", },
[RT5120_REGULATOR_EXTEN] = { .name = "exten", }
};
static int rt5120_parse_regulator_dt_data(struct rt5120_priv *priv)
{
struct device *dev = priv->dev->parent;
struct device_node *reg_node;
int i, ret;
for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
rt5120_fillin_regulator_desc(priv->rdesc + i, i);
rt5120_regu_match[i].desc = priv->rdesc + i;
}
reg_node = of_get_child_by_name(dev->of_node, "regulators");
if (!reg_node) {
dev_err(priv->dev, "Couldn't find 'regulators' node\n");
return -ENODEV;
}
ret = of_regulator_match(priv->dev, reg_node, rt5120_regu_match,
ARRAY_SIZE(rt5120_regu_match));
of_node_put(reg_node);
if (ret < 0) {
dev_err(priv->dev,
"Error parsing regulator init data (%d)\n", ret);
return ret;
}
for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
ret = rt5120_of_parse_cb(priv, i, rt5120_regu_match + i);
if (ret) {
dev_err(priv->dev, "Failed in [%d] of_passe_cb\n", i);
return ret;
}
}
return 0;
}
static int rt5120_device_property_init(struct rt5120_priv *priv)
{
struct device *dev = priv->dev->parent;
struct device_node *np = dev->of_node;
bool prot_enable;
unsigned int prot_enable_val = 0;
/* Assign UV/OV HW protection behavior */
prot_enable = of_property_read_bool(np,
"richtek,enable-undervolt-hiccup");
if (prot_enable)
prot_enable_val |= RT5120_UVHICCUP_MASK;
prot_enable = of_property_read_bool(np,
"richtek,enable-overvolt-hiccup");
if (prot_enable)
prot_enable_val |= RT5120_OVHICCUP_MASK;
return regmap_update_bits(priv->regmap, RT5120_REG_UVOVPROT,
RT5120_UVHICCUP_MASK | RT5120_OVHICCUP_MASK,
prot_enable_val);
}
static int rt5120_regulator_probe(struct platform_device *pdev)
{
struct rt5120_priv *priv;
struct regulator_dev *rdev;
struct regulator_config config = {};
int i, ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = &pdev->dev;
priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!priv->regmap) {
dev_err(&pdev->dev, "Failed to init regmap\n");
return -ENODEV;
}
ret = rt5120_device_property_init(priv);
if (ret) {
dev_err(&pdev->dev, "Failed to do property init\n");
return ret;
}
ret = rt5120_parse_regulator_dt_data(priv);
if (ret) {
dev_err(&pdev->dev, "Failed to parse dt data\n");
return ret;
}
config.dev = &pdev->dev;
config.regmap = priv->regmap;
for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
config.of_node = rt5120_regu_match[i].of_node;
config.init_data = rt5120_regu_match[i].init_data;
rdev = devm_regulator_register(&pdev->dev, priv->rdesc + i,
&config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev,
"Failed to register regulator [%d]\n", i);
return PTR_ERR(rdev);
}
}
return 0;
}
static const struct platform_device_id rt5120_regulator_dev_table[] = {
{ "rt5120-regulator", 0 },
{}
};
MODULE_DEVICE_TABLE(platform, rt5120_regulator_dev_table);
static struct platform_driver rt5120_regulator_driver = {
.driver = {
.name = "rt5120-regulator",
},
.id_table = rt5120_regulator_dev_table,
.probe = rt5120_regulator_probe,
};
module_platform_driver(rt5120_regulator_driver);
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("Richtek RT5120 regulator driver");
MODULE_LICENSE("GPL v2");
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