diff options
Diffstat (limited to 'drivers/regulator/fan53555.c')
| -rw-r--r-- | drivers/regulator/fan53555.c | 677 |
1 files changed, 677 insertions, 0 deletions
diff --git a/drivers/regulator/fan53555.c b/drivers/regulator/fan53555.c new file mode 100644 index 000000000..ecd5a50c6 --- /dev/null +++ b/drivers/regulator/fan53555.c @@ -0,0 +1,677 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver. +// +// Supported Part Numbers: +// FAN53555UC00X/01X/03X/04X/05X +// +// Copyright (c) 2012 Marvell Technology Ltd. +// Yunfan Zhang <yfzhang@marvell.com> + +#include <linux/bits.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/param.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/fan53555.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/of_regulator.h> +#include <linux/slab.h> + +/* Voltage setting */ +#define FAN53555_VSEL0 0x00 +#define FAN53555_VSEL1 0x01 + +#define TCS4525_VSEL0 0x11 +#define TCS4525_VSEL1 0x10 +#define TCS4525_TIME 0x13 +#define TCS4525_COMMAND 0x14 + +/* Control register */ +#define FAN53555_CONTROL 0x02 +/* IC Type */ +#define FAN53555_ID1 0x03 +/* IC mask version */ +#define FAN53555_ID2 0x04 +/* Monitor register */ +#define FAN53555_MONITOR 0x05 + +/* VSEL bit definitions */ +#define VSEL_BUCK_EN (1 << 7) +#define VSEL_MODE (1 << 6) +/* Chip ID and Verison */ +#define DIE_ID 0x0F /* ID1 */ +#define DIE_REV 0x0F /* ID2 */ +/* Control bit definitions */ +#define CTL_OUTPUT_DISCHG (1 << 7) +#define CTL_SLEW_MASK (0x7 << 4) +#define CTL_SLEW_SHIFT 4 +#define CTL_RESET (1 << 2) +#define CTL_MODE_VSEL0_MODE BIT(0) +#define CTL_MODE_VSEL1_MODE BIT(1) + +#define FAN53555_NVOLTAGES 64 /* Numbers of voltages */ +#define FAN53526_NVOLTAGES 128 + +#define TCS_VSEL0_MODE (1 << 7) +#define TCS_VSEL1_MODE (1 << 6) + +#define TCS_SLEW_SHIFT 3 +#define TCS_SLEW_MASK GENMASK(4, 3) + +enum fan53555_vendor { + FAN53526_VENDOR_FAIRCHILD = 0, + FAN53555_VENDOR_FAIRCHILD, + FAN53555_VENDOR_SILERGY, + FAN53526_VENDOR_TCS, +}; + +enum { + FAN53526_CHIP_ID_01 = 1, +}; + +enum { + FAN53526_CHIP_REV_08 = 8, +}; + +/* IC Type */ +enum { + FAN53555_CHIP_ID_00 = 0, + FAN53555_CHIP_ID_01, + FAN53555_CHIP_ID_02, + FAN53555_CHIP_ID_03, + FAN53555_CHIP_ID_04, + FAN53555_CHIP_ID_05, + FAN53555_CHIP_ID_08 = 8, +}; + +enum { + TCS4525_CHIP_ID_12 = 12, +}; + +enum { + TCS4526_CHIP_ID_00 = 0, +}; + +/* IC mask revision */ +enum { + FAN53555_CHIP_REV_00 = 0x3, + FAN53555_CHIP_REV_13 = 0xf, +}; + +enum { + SILERGY_SYR82X = 8, + SILERGY_SYR83X = 9, +}; + +struct fan53555_device_info { + enum fan53555_vendor vendor; + struct device *dev; + struct regulator_desc desc; + struct regulator_init_data *regulator; + /* IC Type and Rev */ + int chip_id; + int chip_rev; + /* Voltage setting register */ + unsigned int vol_reg; + unsigned int sleep_reg; + /* Voltage range and step(linear) */ + unsigned int vsel_min; + unsigned int vsel_step; + unsigned int vsel_count; + /* Mode */ + unsigned int mode_reg; + unsigned int mode_mask; + /* Sleep voltage cache */ + unsigned int sleep_vol_cache; + /* Slew rate */ + unsigned int slew_reg; + unsigned int slew_mask; + const unsigned int *ramp_delay_table; + unsigned int n_ramp_values; + unsigned int slew_rate; +}; + +static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV) +{ + struct fan53555_device_info *di = rdev_get_drvdata(rdev); + int ret; + + if (di->sleep_vol_cache == uV) + return 0; + ret = regulator_map_voltage_linear(rdev, uV, uV); + if (ret < 0) + return ret; + ret = regmap_update_bits(rdev->regmap, di->sleep_reg, + di->desc.vsel_mask, ret); + if (ret < 0) + return ret; + /* Cache the sleep voltage setting. + * Might not be the real voltage which is rounded */ + di->sleep_vol_cache = uV; + + return 0; +} + +static int fan53555_set_suspend_enable(struct regulator_dev *rdev) +{ + struct fan53555_device_info *di = rdev_get_drvdata(rdev); + + return regmap_update_bits(rdev->regmap, di->sleep_reg, + VSEL_BUCK_EN, VSEL_BUCK_EN); +} + +static int fan53555_set_suspend_disable(struct regulator_dev *rdev) +{ + struct fan53555_device_info *di = rdev_get_drvdata(rdev); + + return regmap_update_bits(rdev->regmap, di->sleep_reg, + VSEL_BUCK_EN, 0); +} + +static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode) +{ + struct fan53555_device_info *di = rdev_get_drvdata(rdev); + + switch (mode) { + case REGULATOR_MODE_FAST: + regmap_update_bits(rdev->regmap, di->mode_reg, + di->mode_mask, di->mode_mask); + break; + case REGULATOR_MODE_NORMAL: + regmap_update_bits(rdev->regmap, di->vol_reg, di->mode_mask, 0); + break; + default: + return -EINVAL; + } + return 0; +} + +static unsigned int fan53555_get_mode(struct regulator_dev *rdev) +{ + struct fan53555_device_info *di = rdev_get_drvdata(rdev); + unsigned int val; + int ret = 0; + + ret = regmap_read(rdev->regmap, di->mode_reg, &val); + if (ret < 0) + return ret; + if (val & di->mode_mask) + return REGULATOR_MODE_FAST; + else + return REGULATOR_MODE_NORMAL; +} + +static const unsigned int slew_rates[] = { + 64000, + 32000, + 16000, + 8000, + 4000, + 2000, + 1000, + 500, +}; + +static const unsigned int tcs_slew_rates[] = { + 18700, + 9300, + 4600, + 2300, +}; + +static const struct regulator_ops fan53555_regulator_ops = { + .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, + .map_voltage = regulator_map_voltage_linear, + .list_voltage = regulator_list_voltage_linear, + .set_suspend_voltage = fan53555_set_suspend_voltage, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .set_mode = fan53555_set_mode, + .get_mode = fan53555_get_mode, + .set_ramp_delay = regulator_set_ramp_delay_regmap, + .set_suspend_enable = fan53555_set_suspend_enable, + .set_suspend_disable = fan53555_set_suspend_disable, +}; + +static int fan53526_voltages_setup_fairchild(struct fan53555_device_info *di) +{ + /* Init voltage range and step */ + switch (di->chip_id) { + case FAN53526_CHIP_ID_01: + switch (di->chip_rev) { + case FAN53526_CHIP_REV_08: + di->vsel_min = 600000; + di->vsel_step = 6250; + break; + default: + dev_err(di->dev, + "Chip ID %d with rev %d not supported!\n", + di->chip_id, di->chip_rev); + return -EINVAL; + } + break; + default: + dev_err(di->dev, + "Chip ID %d not supported!\n", di->chip_id); + return -EINVAL; + } + + di->slew_reg = FAN53555_CONTROL; + di->slew_mask = CTL_SLEW_MASK; + di->ramp_delay_table = slew_rates; + di->n_ramp_values = ARRAY_SIZE(slew_rates); + di->vsel_count = FAN53526_NVOLTAGES; + + return 0; +} + +static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di) +{ + /* Init voltage range and step */ + switch (di->chip_id) { + case FAN53555_CHIP_ID_00: + switch (di->chip_rev) { + case FAN53555_CHIP_REV_00: + di->vsel_min = 600000; + di->vsel_step = 10000; + break; + case FAN53555_CHIP_REV_13: + di->vsel_min = 800000; + di->vsel_step = 10000; + break; + default: + dev_err(di->dev, + "Chip ID %d with rev %d not supported!\n", + di->chip_id, di->chip_rev); + return -EINVAL; + } + break; + case FAN53555_CHIP_ID_01: + case FAN53555_CHIP_ID_03: + case FAN53555_CHIP_ID_05: + case FAN53555_CHIP_ID_08: + di->vsel_min = 600000; + di->vsel_step = 10000; + break; + case FAN53555_CHIP_ID_04: + di->vsel_min = 603000; + di->vsel_step = 12826; + break; + default: + dev_err(di->dev, + "Chip ID %d not supported!\n", di->chip_id); + return -EINVAL; + } + di->slew_reg = FAN53555_CONTROL; + di->slew_mask = CTL_SLEW_MASK; + di->ramp_delay_table = slew_rates; + di->n_ramp_values = ARRAY_SIZE(slew_rates); + di->vsel_count = FAN53555_NVOLTAGES; + + return 0; +} + +static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di) +{ + /* Init voltage range and step */ + switch (di->chip_id) { + case SILERGY_SYR82X: + case SILERGY_SYR83X: + di->vsel_min = 712500; + di->vsel_step = 12500; + break; + default: + dev_err(di->dev, + "Chip ID %d not supported!\n", di->chip_id); + return -EINVAL; + } + di->slew_reg = FAN53555_CONTROL; + di->slew_mask = CTL_SLEW_MASK; + di->ramp_delay_table = slew_rates; + di->n_ramp_values = ARRAY_SIZE(slew_rates); + di->vsel_count = FAN53555_NVOLTAGES; + + return 0; +} + +static int fan53526_voltages_setup_tcs(struct fan53555_device_info *di) +{ + switch (di->chip_id) { + case TCS4525_CHIP_ID_12: + case TCS4526_CHIP_ID_00: + di->slew_reg = TCS4525_TIME; + di->slew_mask = TCS_SLEW_MASK; + di->ramp_delay_table = tcs_slew_rates; + di->n_ramp_values = ARRAY_SIZE(tcs_slew_rates); + + /* Init voltage range and step */ + di->vsel_min = 600000; + di->vsel_step = 6250; + di->vsel_count = FAN53526_NVOLTAGES; + break; + default: + dev_err(di->dev, "Chip ID %d not supported!\n", di->chip_id); + return -EINVAL; + } + + return 0; +} + +/* For 00,01,03,05 options: + * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V. + * For 04 option: + * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V. + * */ +static int fan53555_device_setup(struct fan53555_device_info *di, + struct fan53555_platform_data *pdata) +{ + int ret = 0; + + /* Setup voltage control register */ + switch (di->vendor) { + case FAN53526_VENDOR_FAIRCHILD: + case FAN53555_VENDOR_FAIRCHILD: + case FAN53555_VENDOR_SILERGY: + switch (pdata->sleep_vsel_id) { + case FAN53555_VSEL_ID_0: + di->sleep_reg = FAN53555_VSEL0; + di->vol_reg = FAN53555_VSEL1; + break; + case FAN53555_VSEL_ID_1: + di->sleep_reg = FAN53555_VSEL1; + di->vol_reg = FAN53555_VSEL0; + break; + default: + dev_err(di->dev, "Invalid VSEL ID!\n"); + return -EINVAL; + } + break; + case FAN53526_VENDOR_TCS: + switch (pdata->sleep_vsel_id) { + case FAN53555_VSEL_ID_0: + di->sleep_reg = TCS4525_VSEL0; + di->vol_reg = TCS4525_VSEL1; + break; + case FAN53555_VSEL_ID_1: + di->sleep_reg = TCS4525_VSEL1; + di->vol_reg = TCS4525_VSEL0; + break; + default: + dev_err(di->dev, "Invalid VSEL ID!\n"); + return -EINVAL; + } + break; + default: + dev_err(di->dev, "vendor %d not supported!\n", di->vendor); + return -EINVAL; + } + + /* Setup mode control register */ + switch (di->vendor) { + case FAN53526_VENDOR_FAIRCHILD: + di->mode_reg = FAN53555_CONTROL; + + switch (pdata->sleep_vsel_id) { + case FAN53555_VSEL_ID_0: + di->mode_mask = CTL_MODE_VSEL1_MODE; + break; + case FAN53555_VSEL_ID_1: + di->mode_mask = CTL_MODE_VSEL0_MODE; + break; + } + break; + case FAN53555_VENDOR_FAIRCHILD: + case FAN53555_VENDOR_SILERGY: + di->mode_reg = di->vol_reg; + di->mode_mask = VSEL_MODE; + break; + case FAN53526_VENDOR_TCS: + di->mode_reg = TCS4525_COMMAND; + + switch (pdata->sleep_vsel_id) { + case FAN53555_VSEL_ID_0: + di->mode_mask = TCS_VSEL1_MODE; + break; + case FAN53555_VSEL_ID_1: + di->mode_mask = TCS_VSEL0_MODE; + break; + } + break; + default: + dev_err(di->dev, "vendor %d not supported!\n", di->vendor); + return -EINVAL; + } + + /* Setup voltage range */ + switch (di->vendor) { + case FAN53526_VENDOR_FAIRCHILD: + ret = fan53526_voltages_setup_fairchild(di); + break; + case FAN53555_VENDOR_FAIRCHILD: + ret = fan53555_voltages_setup_fairchild(di); + break; + case FAN53555_VENDOR_SILERGY: + ret = fan53555_voltages_setup_silergy(di); + break; + case FAN53526_VENDOR_TCS: + ret = fan53526_voltages_setup_tcs(di); + break; + default: + dev_err(di->dev, "vendor %d not supported!\n", di->vendor); + return -EINVAL; + } + + return ret; +} + +static int fan53555_regulator_register(struct fan53555_device_info *di, + struct regulator_config *config) +{ + struct regulator_desc *rdesc = &di->desc; + struct regulator_dev *rdev; + + rdesc->name = "fan53555-reg"; + rdesc->supply_name = "vin"; + rdesc->ops = &fan53555_regulator_ops; + rdesc->type = REGULATOR_VOLTAGE; + rdesc->n_voltages = di->vsel_count; + rdesc->enable_reg = di->vol_reg; + rdesc->enable_mask = VSEL_BUCK_EN; + rdesc->min_uV = di->vsel_min; + rdesc->uV_step = di->vsel_step; + rdesc->vsel_reg = di->vol_reg; + rdesc->vsel_mask = di->vsel_count - 1; + rdesc->ramp_reg = di->slew_reg; + rdesc->ramp_mask = di->slew_mask; + rdesc->ramp_delay_table = di->ramp_delay_table; + rdesc->n_ramp_values = di->n_ramp_values; + rdesc->owner = THIS_MODULE; + + rdev = devm_regulator_register(di->dev, &di->desc, config); + return PTR_ERR_OR_ZERO(rdev); +} + +static const struct regmap_config fan53555_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev, + struct device_node *np, + const struct regulator_desc *desc) +{ + struct fan53555_platform_data *pdata; + int ret; + u32 tmp; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return NULL; + + pdata->regulator = of_get_regulator_init_data(dev, np, desc); + + ret = of_property_read_u32(np, "fcs,suspend-voltage-selector", + &tmp); + if (!ret) + pdata->sleep_vsel_id = tmp; + + return pdata; +} + +static const struct of_device_id __maybe_unused fan53555_dt_ids[] = { + { + .compatible = "fcs,fan53526", + .data = (void *)FAN53526_VENDOR_FAIRCHILD, + }, { + .compatible = "fcs,fan53555", + .data = (void *)FAN53555_VENDOR_FAIRCHILD + }, { + .compatible = "silergy,syr827", + .data = (void *)FAN53555_VENDOR_SILERGY, + }, { + .compatible = "silergy,syr828", + .data = (void *)FAN53555_VENDOR_SILERGY, + }, { + .compatible = "tcs,tcs4525", + .data = (void *)FAN53526_VENDOR_TCS + }, { + .compatible = "tcs,tcs4526", + .data = (void *)FAN53526_VENDOR_TCS + }, + { } +}; +MODULE_DEVICE_TABLE(of, fan53555_dt_ids); + +static int fan53555_regulator_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device_node *np = client->dev.of_node; + struct fan53555_device_info *di; + struct fan53555_platform_data *pdata; + struct regulator_config config = { }; + struct regmap *regmap; + unsigned int val; + int ret; + + di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info), + GFP_KERNEL); + if (!di) + return -ENOMEM; + + pdata = dev_get_platdata(&client->dev); + if (!pdata) + pdata = fan53555_parse_dt(&client->dev, np, &di->desc); + + if (!pdata || !pdata->regulator) { + dev_err(&client->dev, "Platform data not found!\n"); + return -ENODEV; + } + + di->regulator = pdata->regulator; + if (client->dev.of_node) { + di->vendor = + (unsigned long)of_device_get_match_data(&client->dev); + } else { + /* if no ramp constraint set, get the pdata ramp_delay */ + if (!di->regulator->constraints.ramp_delay) { + if (pdata->slew_rate >= ARRAY_SIZE(slew_rates)) { + dev_err(&client->dev, "Invalid slew_rate\n"); + return -EINVAL; + } + + di->regulator->constraints.ramp_delay + = slew_rates[pdata->slew_rate]; + } + + di->vendor = id->driver_data; + } + + regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "Failed to allocate regmap!\n"); + return PTR_ERR(regmap); + } + di->dev = &client->dev; + i2c_set_clientdata(client, di); + /* Get chip ID */ + ret = regmap_read(regmap, FAN53555_ID1, &val); + if (ret < 0) { + dev_err(&client->dev, "Failed to get chip ID!\n"); + return ret; + } + di->chip_id = val & DIE_ID; + /* Get chip revision */ + ret = regmap_read(regmap, FAN53555_ID2, &val); + if (ret < 0) { + dev_err(&client->dev, "Failed to get chip Rev!\n"); + return ret; + } + di->chip_rev = val & DIE_REV; + dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n", + di->chip_id, di->chip_rev); + /* Device init */ + ret = fan53555_device_setup(di, pdata); + if (ret < 0) { + dev_err(&client->dev, "Failed to setup device!\n"); + return ret; + } + /* Register regulator */ + config.dev = di->dev; + config.init_data = di->regulator; + config.regmap = regmap; + config.driver_data = di; + config.of_node = np; + + ret = fan53555_regulator_register(di, &config); + if (ret < 0) + dev_err(&client->dev, "Failed to register regulator!\n"); + return ret; + +} + +static const struct i2c_device_id fan53555_id[] = { + { + .name = "fan53526", + .driver_data = FAN53526_VENDOR_FAIRCHILD + }, { + .name = "fan53555", + .driver_data = FAN53555_VENDOR_FAIRCHILD + }, { + .name = "syr827", + .driver_data = FAN53555_VENDOR_SILERGY + }, { + .name = "syr828", + .driver_data = FAN53555_VENDOR_SILERGY + }, { + .name = "tcs4525", + .driver_data = FAN53526_VENDOR_TCS + }, { + .name = "tcs4526", + .driver_data = FAN53526_VENDOR_TCS + }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, fan53555_id); + +static struct i2c_driver fan53555_regulator_driver = { + .driver = { + .name = "fan53555-regulator", + .of_match_table = of_match_ptr(fan53555_dt_ids), + }, + .probe = fan53555_regulator_probe, + .id_table = fan53555_id, +}; + +module_i2c_driver(fan53555_regulator_driver); + +MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>"); +MODULE_DESCRIPTION("FAN53555 regulator driver"); +MODULE_LICENSE("GPL v2"); |