#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/mt6315-regulator.h>
#include <linux/regulator/of_regulator.h>
#include <linux/spmi.h>
#define MT6315_BUCK_MODE_AUTO 0
#define MT6315_BUCK_MODE_FORCE_PWM 1
#define MT6315_BUCK_MODE_LP 2
struct mt6315_regulator_info {
struct regulator_desc desc;
u32 status_reg;
u32 lp_mode_mask;
u32 lp_mode_shift;
};
struct mt_regulator_init_data {
u32 modeset_mask[MT6315_VBUCK_MAX];
};
struct mt6315_chip {
struct device *dev;
struct regmap *regmap;
};
#define MT_BUCK(_name, _bid, _vsel) \
[_bid] = { \
.desc = { \
.name = _name, \
.of_match = of_match_ptr(_name), \
.regulators_node = "regulators", \
.ops = &mt6315_volt_range_ops, \
.type = REGULATOR_VOLTAGE, \
.id = _bid, \
.owner = THIS_MODULE, \
.n_voltages = 0xc0, \
.linear_ranges = mt_volt_range1, \
.n_linear_ranges = ARRAY_SIZE(mt_volt_range1), \
.vsel_reg = _vsel, \
.vsel_mask = 0xff, \
.enable_reg = MT6315_BUCK_TOP_CON0, \
.enable_mask = BIT(_bid), \
.of_map_mode = mt6315_map_mode, \
}, \
.status_reg = _bid##_DBG4, \
.lp_mode_mask = BIT(_bid), \
.lp_mode_shift = _bid, \
}
static const struct linear_range mt_volt_range1[] = {
REGULATOR_LINEAR_RANGE(0, 0, 0xbf, 6250),
};
static unsigned int mt6315_map_mode(unsigned int mode)
{
switch (mode) {
case MT6315_BUCK_MODE_AUTO:
return REGULATOR_MODE_NORMAL;
case MT6315_BUCK_MODE_FORCE_PWM:
return REGULATOR_MODE_FAST;
case MT6315_BUCK_MODE_LP:
return REGULATOR_MODE_IDLE;
default:
return REGULATOR_MODE_INVALID;
}
}
static unsigned int mt6315_regulator_get_mode(struct regulator_dev *rdev)
{
struct mt_regulator_init_data *init = rdev_get_drvdata(rdev);
const struct mt6315_regulator_info *info;
int ret, regval;
u32 modeset_mask;
info = container_of_const(rdev->desc, struct mt6315_regulator_info, desc);
modeset_mask = init->modeset_mask[rdev_get_id(rdev)];
ret = regmap_read(rdev->regmap, MT6315_BUCK_TOP_4PHASE_ANA_CON42, ®val);
if (ret != 0) {
dev_err(&rdev->dev, "Failed to get mode: %d\n", ret);
return ret;
}
if ((regval & modeset_mask) == modeset_mask)
return REGULATOR_MODE_FAST;
ret = regmap_read(rdev->regmap, MT6315_BUCK_TOP_CON1, ®val);
if (ret != 0) {
dev_err(&rdev->dev, "Failed to get lp mode: %d\n", ret);
return ret;
}
if (regval & info->lp_mode_mask)
return REGULATOR_MODE_IDLE;
else
return REGULATOR_MODE_NORMAL;
}
static int mt6315_regulator_set_mode(struct regulator_dev *rdev,
u32 mode)
{
struct mt_regulator_init_data *init = rdev_get_drvdata(rdev);
const struct mt6315_regulator_info *info;
int ret, val, curr_mode;
u32 modeset_mask;
info = container_of_const(rdev->desc, struct mt6315_regulator_info, desc);
modeset_mask = init->modeset_mask[rdev_get_id(rdev)];
curr_mode = mt6315_regulator_get_mode(rdev);
switch (mode) {
case REGULATOR_MODE_FAST:
ret = regmap_update_bits(rdev->regmap,
MT6315_BUCK_TOP_4PHASE_ANA_CON42,
modeset_mask,
modeset_mask);
break;
case REGULATOR_MODE_NORMAL:
if (curr_mode == REGULATOR_MODE_FAST) {
ret = regmap_update_bits(rdev->regmap,
MT6315_BUCK_TOP_4PHASE_ANA_CON42,
modeset_mask,
0);
} else if (curr_mode == REGULATOR_MODE_IDLE) {
ret = regmap_update_bits(rdev->regmap,
MT6315_BUCK_TOP_CON1,
info->lp_mode_mask,
0);
usleep_range(100, 110);
} else {
ret = -EINVAL;
}
break;
case REGULATOR_MODE_IDLE:
val = MT6315_BUCK_MODE_LP >> 1;
val <<= info->lp_mode_shift;
ret = regmap_update_bits(rdev->regmap,
MT6315_BUCK_TOP_CON1,
info->lp_mode_mask,
val);
break;
default:
ret = -EINVAL;
dev_err(&rdev->dev, "Unsupported mode: %d\n", mode);
break;
}
if (ret != 0) {
dev_err(&rdev->dev, "Failed to set mode: %d\n", ret);
return ret;
}
return 0;
}
static int mt6315_get_status(struct regulator_dev *rdev)
{
const struct mt6315_regulator_info *info;
int ret;
u32 regval;
info = container_of_const(rdev->desc, struct mt6315_regulator_info, desc);
ret = regmap_read(rdev->regmap, info->status_reg, ®val);
if (ret < 0) {
dev_err(&rdev->dev, "Failed to get enable reg: %d\n", ret);
return ret;
}
return (regval & BIT(0)) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
}
static const struct regulator_ops mt6315_volt_range_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.get_status = mt6315_get_status,
.set_mode = mt6315_regulator_set_mode,
.get_mode = mt6315_regulator_get_mode,
};
static const struct mt6315_regulator_info mt6315_regulators[MT6315_VBUCK_MAX] = {
MT_BUCK("vbuck1", MT6315_VBUCK1, MT6315_BUCK_TOP_ELR0),
MT_BUCK("vbuck2", MT6315_VBUCK2, MT6315_BUCK_TOP_ELR2),
MT_BUCK("vbuck3", MT6315_VBUCK3, MT6315_BUCK_TOP_ELR4),
MT_BUCK("vbuck4", MT6315_VBUCK4, MT6315_BUCK_TOP_ELR6),
};
static const struct regmap_config mt6315_regmap_config = {
.reg_bits = 16,
.val_bits = 8,
.max_register = 0x16d0,
.fast_io = true,
};
static const struct of_device_id mt6315_of_match[] = {
{
.compatible = "mediatek,mt6315-regulator",
}, {
},
};
MODULE_DEVICE_TABLE(of, mt6315_of_match);
static int mt6315_regulator_probe(struct spmi_device *pdev)
{
struct device *dev = &pdev->dev;
struct regmap *regmap;
struct mt6315_chip *chip;
struct mt_regulator_init_data *init_data;
struct regulator_config config = {};
struct regulator_dev *rdev;
int i;
regmap = devm_regmap_init_spmi_ext(pdev, &mt6315_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
chip = devm_kzalloc(dev, sizeof(struct mt6315_chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
init_data = devm_kzalloc(dev, sizeof(struct mt_regulator_init_data), GFP_KERNEL);
if (!init_data)
return -ENOMEM;
switch (pdev->usid) {
case MT6315_PP:
init_data->modeset_mask[MT6315_VBUCK1] = BIT(MT6315_VBUCK1) | BIT(MT6315_VBUCK2) |
BIT(MT6315_VBUCK4);
break;
case MT6315_SP:
case MT6315_RP:
init_data->modeset_mask[MT6315_VBUCK1] = BIT(MT6315_VBUCK1) | BIT(MT6315_VBUCK2);
break;
default:
init_data->modeset_mask[MT6315_VBUCK1] = BIT(MT6315_VBUCK1);
break;
}
for (i = MT6315_VBUCK2; i < MT6315_VBUCK_MAX; i++)
init_data->modeset_mask[i] = BIT(i);
chip->dev = dev;
chip->regmap = regmap;
dev_set_drvdata(dev, chip);
config.dev = dev;
config.regmap = regmap;
for (i = MT6315_VBUCK1; i < MT6315_VBUCK_MAX; i++) {
config.driver_data = init_data;
rdev = devm_regulator_register(dev, &mt6315_regulators[i].desc, &config);
if (IS_ERR(rdev)) {
dev_err(dev, "Failed to register %s\n",
mt6315_regulators[i].desc.name);
return PTR_ERR(rdev);
}
}
return 0;
}
static void mt6315_regulator_shutdown(struct spmi_device *pdev)
{
struct mt6315_chip *chip = dev_get_drvdata(&pdev->dev);
int ret = 0;
ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY_H, PROTECTION_KEY_H);
ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY, PROTECTION_KEY);
ret |= regmap_update_bits(chip->regmap, MT6315_TOP2_ELR7, 1, 1);
ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY, 0);
ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY_H, 0);
if (ret < 0)
dev_err(&pdev->dev, "[%#x] Failed to enable power off sequence. %d\n",
pdev->usid, ret);
}
static struct spmi_driver mt6315_regulator_driver = {
.driver = {
.name = "mt6315-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = mt6315_of_match,
},
.probe = mt6315_regulator_probe,
.shutdown = mt6315_regulator_shutdown,
};
module_spmi_driver(mt6315_regulator_driver);
MODULE_AUTHOR("Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>");
MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6315 PMIC");
MODULE_LICENSE("GPL");
