diff options
Diffstat (limited to 'drivers/regulator/tps62360-regulator.c')
| -rw-r--r-- | drivers/regulator/tps62360-regulator.c | 539 |
1 files changed, 539 insertions, 0 deletions
diff --git a/drivers/regulator/tps62360-regulator.c b/drivers/regulator/tps62360-regulator.c new file mode 100644 index 000000000..315cd5daf --- /dev/null +++ b/drivers/regulator/tps62360-regulator.c @@ -0,0 +1,539 @@ +/* + * tps62360.c -- TI tps62360 + * + * Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363. + * + * Copyright (c) 2012, NVIDIA Corporation. + * + * Author: Laxman Dewangan <ldewangan@nvidia.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, + * whether express or implied; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + * 02111-1307, USA + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_gpio.h> +#include <linux/regulator/of_regulator.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/tps62360.h> +#include <linux/gpio.h> +#include <linux/i2c.h> +#include <linux/slab.h> +#include <linux/regmap.h> + +/* Register definitions */ +#define REG_VSET0 0 +#define REG_VSET1 1 +#define REG_VSET2 2 +#define REG_VSET3 3 +#define REG_CONTROL 4 +#define REG_TEMP 5 +#define REG_RAMPCTRL 6 +#define REG_CHIPID 8 + +#define FORCE_PWM_ENABLE BIT(7) + +enum chips {TPS62360, TPS62361, TPS62362, TPS62363}; + +#define TPS62360_BASE_VOLTAGE 770000 +#define TPS62360_N_VOLTAGES 64 + +#define TPS62361_BASE_VOLTAGE 500000 +#define TPS62361_N_VOLTAGES 128 + +/* tps 62360 chip information */ +struct tps62360_chip { + struct device *dev; + struct regulator_desc desc; + struct regulator_dev *rdev; + struct regmap *regmap; + int vsel0_gpio; + int vsel1_gpio; + u8 voltage_reg_mask; + bool en_internal_pulldn; + bool en_discharge; + bool valid_gpios; + int lru_index[4]; + int curr_vset_vsel[4]; + int curr_vset_id; +}; + +/* + * find_voltage_set_register: Find new voltage configuration register + * (VSET) id. + * The finding of the new VSET register will be based on the LRU mechanism. + * Each VSET register will have different voltage configured . This + * Function will look if any of the VSET register have requested voltage set + * or not. + * - If it is already there then it will make that register as most + * recently used and return as found so that caller need not to set + * the VSET register but need to set the proper gpios to select this + * VSET register. + * - If requested voltage is not found then it will use the least + * recently mechanism to get new VSET register for new configuration + * and will return not_found so that caller need to set new VSET + * register and then gpios (both). + */ +static bool find_voltage_set_register(struct tps62360_chip *tps, + int req_vsel, int *vset_reg_id) +{ + int i; + bool found = false; + int new_vset_reg = tps->lru_index[3]; + int found_index = 3; + + for (i = 0; i < 4; ++i) { + if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) { + new_vset_reg = tps->lru_index[i]; + found_index = i; + found = true; + goto update_lru_index; + } + } + +update_lru_index: + for (i = found_index; i > 0; i--) + tps->lru_index[i] = tps->lru_index[i - 1]; + + tps->lru_index[0] = new_vset_reg; + *vset_reg_id = new_vset_reg; + return found; +} + +static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev) +{ + struct tps62360_chip *tps = rdev_get_drvdata(dev); + int vsel; + unsigned int data; + int ret; + + ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data); + if (ret < 0) { + dev_err(tps->dev, "%s(): register %d read failed with err %d\n", + __func__, REG_VSET0 + tps->curr_vset_id, ret); + return ret; + } + vsel = (int)data & tps->voltage_reg_mask; + return vsel; +} + +static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev, + unsigned selector) +{ + struct tps62360_chip *tps = rdev_get_drvdata(dev); + int ret; + bool found = false; + int new_vset_id = tps->curr_vset_id; + + /* + * If gpios are available to select the VSET register then least + * recently used register for new configuration. + */ + if (tps->valid_gpios) + found = find_voltage_set_register(tps, selector, &new_vset_id); + + if (!found) { + ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id, + tps->voltage_reg_mask, selector); + if (ret < 0) { + dev_err(tps->dev, + "%s(): register %d update failed with err %d\n", + __func__, REG_VSET0 + new_vset_id, ret); + return ret; + } + tps->curr_vset_id = new_vset_id; + tps->curr_vset_vsel[new_vset_id] = selector; + } + + /* Select proper VSET register vio gpios */ + if (tps->valid_gpios) { + gpio_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1); + gpio_set_value_cansleep(tps->vsel1_gpio, + (new_vset_id >> 1) & 0x1); + } + return 0; +} + +static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode) +{ + struct tps62360_chip *tps = rdev_get_drvdata(rdev); + int i; + int val; + int ret; + + /* Enable force PWM mode in FAST mode only. */ + switch (mode) { + case REGULATOR_MODE_FAST: + val = FORCE_PWM_ENABLE; + break; + + case REGULATOR_MODE_NORMAL: + val = 0; + break; + + default: + return -EINVAL; + } + + if (!tps->valid_gpios) { + ret = regmap_update_bits(tps->regmap, + REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val); + if (ret < 0) + dev_err(tps->dev, + "%s(): register %d update failed with err %d\n", + __func__, REG_VSET0 + tps->curr_vset_id, ret); + return ret; + } + + /* If gpios are valid then all register set need to be control */ + for (i = 0; i < 4; ++i) { + ret = regmap_update_bits(tps->regmap, + REG_VSET0 + i, FORCE_PWM_ENABLE, val); + if (ret < 0) { + dev_err(tps->dev, + "%s(): register %d update failed with err %d\n", + __func__, REG_VSET0 + i, ret); + return ret; + } + } + return ret; +} + +static unsigned int tps62360_get_mode(struct regulator_dev *rdev) +{ + struct tps62360_chip *tps = rdev_get_drvdata(rdev); + unsigned int data; + int ret; + + ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data); + if (ret < 0) { + dev_err(tps->dev, "%s(): register %d read failed with err %d\n", + __func__, REG_VSET0 + tps->curr_vset_id, ret); + return ret; + } + return (data & FORCE_PWM_ENABLE) ? + REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; +} + +static const struct regulator_ops tps62360_dcdc_ops = { + .get_voltage_sel = tps62360_dcdc_get_voltage_sel, + .set_voltage_sel = tps62360_dcdc_set_voltage_sel, + .list_voltage = regulator_list_voltage_linear, + .map_voltage = regulator_map_voltage_linear, + .set_voltage_time_sel = regulator_set_voltage_time_sel, + .set_mode = tps62360_set_mode, + .get_mode = tps62360_get_mode, +}; + +static int tps62360_init_dcdc(struct tps62360_chip *tps, + struct tps62360_regulator_platform_data *pdata) +{ + int ret; + unsigned int ramp_ctrl; + + /* Initialize internal pull up/down control */ + if (tps->en_internal_pulldn) + ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0); + else + ret = regmap_write(tps->regmap, REG_CONTROL, 0x0); + if (ret < 0) { + dev_err(tps->dev, + "%s(): register %d write failed with err %d\n", + __func__, REG_CONTROL, ret); + return ret; + } + + /* Reset output discharge path to reduce power consumption */ + ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0); + if (ret < 0) { + dev_err(tps->dev, + "%s(): register %d update failed with err %d\n", + __func__, REG_RAMPCTRL, ret); + return ret; + } + + /* Get ramp value from ramp control register */ + ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl); + if (ret < 0) { + dev_err(tps->dev, + "%s(): register %d read failed with err %d\n", + __func__, REG_RAMPCTRL, ret); + return ret; + } + ramp_ctrl = (ramp_ctrl >> 5) & 0x7; + + /* ramp mV/us = 32/(2^ramp_ctrl) */ + tps->desc.ramp_delay = DIV_ROUND_UP(32000, BIT(ramp_ctrl)); + return ret; +} + +static const struct regmap_config tps62360_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = REG_CHIPID, + .cache_type = REGCACHE_RBTREE, +}; + +static struct tps62360_regulator_platform_data * + of_get_tps62360_platform_data(struct device *dev, + const struct regulator_desc *desc) +{ + struct tps62360_regulator_platform_data *pdata; + struct device_node *np = dev->of_node; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return NULL; + + pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node, + desc); + if (!pdata->reg_init_data) { + dev_err(dev, "Not able to get OF regulator init data\n"); + return NULL; + } + + pdata->vsel0_gpio = of_get_named_gpio(np, "vsel0-gpio", 0); + pdata->vsel1_gpio = of_get_named_gpio(np, "vsel1-gpio", 0); + + if (of_find_property(np, "ti,vsel0-state-high", NULL)) + pdata->vsel0_def_state = 1; + + if (of_find_property(np, "ti,vsel1-state-high", NULL)) + pdata->vsel1_def_state = 1; + + if (of_find_property(np, "ti,enable-pull-down", NULL)) + pdata->en_internal_pulldn = true; + + if (of_find_property(np, "ti,enable-vout-discharge", NULL)) + pdata->en_discharge = true; + + return pdata; +} + +#if defined(CONFIG_OF) +static const struct of_device_id tps62360_of_match[] = { + { .compatible = "ti,tps62360", .data = (void *)TPS62360}, + { .compatible = "ti,tps62361", .data = (void *)TPS62361}, + { .compatible = "ti,tps62362", .data = (void *)TPS62362}, + { .compatible = "ti,tps62363", .data = (void *)TPS62363}, + {}, +}; +MODULE_DEVICE_TABLE(of, tps62360_of_match); +#endif + +static int tps62360_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct regulator_config config = { }; + struct tps62360_regulator_platform_data *pdata; + struct regulator_dev *rdev; + struct tps62360_chip *tps; + int ret; + int i; + int chip_id; + + pdata = dev_get_platdata(&client->dev); + + tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); + if (!tps) + return -ENOMEM; + + tps->desc.name = client->name; + tps->desc.id = 0; + tps->desc.ops = &tps62360_dcdc_ops; + tps->desc.type = REGULATOR_VOLTAGE; + tps->desc.owner = THIS_MODULE; + tps->desc.uV_step = 10000; + + if (client->dev.of_node) { + const struct of_device_id *match; + match = of_match_device(of_match_ptr(tps62360_of_match), + &client->dev); + if (!match) { + dev_err(&client->dev, "Error: No device match found\n"); + return -ENODEV; + } + chip_id = (int)(long)match->data; + if (!pdata) + pdata = of_get_tps62360_platform_data(&client->dev, + &tps->desc); + } else if (id) { + chip_id = id->driver_data; + } else { + dev_err(&client->dev, "No device tree match or id table match found\n"); + return -ENODEV; + } + + if (!pdata) { + dev_err(&client->dev, "%s(): Platform data not found\n", + __func__); + return -EIO; + } + + tps->en_discharge = pdata->en_discharge; + tps->en_internal_pulldn = pdata->en_internal_pulldn; + tps->vsel0_gpio = pdata->vsel0_gpio; + tps->vsel1_gpio = pdata->vsel1_gpio; + tps->dev = &client->dev; + + switch (chip_id) { + case TPS62360: + case TPS62362: + tps->desc.min_uV = TPS62360_BASE_VOLTAGE; + tps->voltage_reg_mask = 0x3F; + tps->desc.n_voltages = TPS62360_N_VOLTAGES; + break; + case TPS62361: + case TPS62363: + tps->desc.min_uV = TPS62361_BASE_VOLTAGE; + tps->voltage_reg_mask = 0x7F; + tps->desc.n_voltages = TPS62361_N_VOLTAGES; + break; + default: + return -ENODEV; + } + + tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config); + if (IS_ERR(tps->regmap)) { + ret = PTR_ERR(tps->regmap); + dev_err(&client->dev, + "%s(): regmap allocation failed with err %d\n", + __func__, ret); + return ret; + } + i2c_set_clientdata(client, tps); + + tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 + + (pdata->vsel0_def_state & 1); + tps->lru_index[0] = tps->curr_vset_id; + tps->valid_gpios = false; + + if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) { + int gpio_flags; + gpio_flags = (pdata->vsel0_def_state) ? + GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; + ret = devm_gpio_request_one(&client->dev, tps->vsel0_gpio, + gpio_flags, "tps62360-vsel0"); + if (ret) { + dev_err(&client->dev, + "%s(): Could not obtain vsel0 GPIO %d: %d\n", + __func__, tps->vsel0_gpio, ret); + return ret; + } + + gpio_flags = (pdata->vsel1_def_state) ? + GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; + ret = devm_gpio_request_one(&client->dev, tps->vsel1_gpio, + gpio_flags, "tps62360-vsel1"); + if (ret) { + dev_err(&client->dev, + "%s(): Could not obtain vsel1 GPIO %d: %d\n", + __func__, tps->vsel1_gpio, ret); + return ret; + } + tps->valid_gpios = true; + + /* + * Initialize the lru index with vset_reg id + * The index 0 will be most recently used and + * set with the tps->curr_vset_id */ + for (i = 0; i < 4; ++i) + tps->lru_index[i] = i; + tps->lru_index[0] = tps->curr_vset_id; + tps->lru_index[tps->curr_vset_id] = 0; + } + + ret = tps62360_init_dcdc(tps, pdata); + if (ret < 0) { + dev_err(tps->dev, "%s(): Init failed with err = %d\n", + __func__, ret); + return ret; + } + + config.dev = &client->dev; + config.init_data = pdata->reg_init_data; + config.driver_data = tps; + config.of_node = client->dev.of_node; + + /* Register the regulators */ + rdev = devm_regulator_register(&client->dev, &tps->desc, &config); + if (IS_ERR(rdev)) { + dev_err(tps->dev, + "%s(): regulator register failed with err %s\n", + __func__, id->name); + return PTR_ERR(rdev); + } + + tps->rdev = rdev; + return 0; +} + +static void tps62360_shutdown(struct i2c_client *client) +{ + struct tps62360_chip *tps = i2c_get_clientdata(client); + int st; + + if (!tps->en_discharge) + return; + + /* Configure the output discharge path */ + st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2)); + if (st < 0) + dev_err(tps->dev, + "%s(): register %d update failed with err %d\n", + __func__, REG_RAMPCTRL, st); +} + +static const struct i2c_device_id tps62360_id[] = { + {.name = "tps62360", .driver_data = TPS62360}, + {.name = "tps62361", .driver_data = TPS62361}, + {.name = "tps62362", .driver_data = TPS62362}, + {.name = "tps62363", .driver_data = TPS62363}, + {}, +}; + +MODULE_DEVICE_TABLE(i2c, tps62360_id); + +static struct i2c_driver tps62360_i2c_driver = { + .driver = { + .name = "tps62360", + .of_match_table = of_match_ptr(tps62360_of_match), + }, + .probe = tps62360_probe, + .shutdown = tps62360_shutdown, + .id_table = tps62360_id, +}; + +static int __init tps62360_init(void) +{ + return i2c_add_driver(&tps62360_i2c_driver); +} +subsys_initcall(tps62360_init); + +static void __exit tps62360_cleanup(void) +{ + i2c_del_driver(&tps62360_i2c_driver); +} +module_exit(tps62360_cleanup); + +MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); +MODULE_DESCRIPTION("TPS6236x voltage regulator driver"); +MODULE_LICENSE("GPL v2"); |