| /* |
| * 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 |
| |
| 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 chip_id; |
| int vsel0_gpio; |
| int vsel1_gpio; |
| int voltage_base; |
| u8 voltage_reg_mask; |
| bool en_internal_pulldn; |
| bool en_force_pwm; |
| bool en_discharge; |
| bool valid_gpios; |
| int lru_index[4]; |
| int curr_vset_vsel[4]; |
| int curr_vset_id; |
| int change_uv_per_us; |
| }; |
| |
| /* |
| * 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(struct regulator_dev *dev, |
| int min_uV, int max_uV, unsigned *selector) |
| { |
| struct tps62360_chip *tps = rdev_get_drvdata(dev); |
| int vsel; |
| int ret; |
| bool found = false; |
| int new_vset_id = tps->curr_vset_id; |
| |
| if ((max_uV < min_uV) || (max_uV < tps->voltage_base)) |
| return -EINVAL; |
| |
| if (min_uV > (tps->voltage_base + (tps->desc.n_voltages - 1) * 10000)) |
| return -EINVAL; |
| |
| vsel = DIV_ROUND_UP(min_uV - tps->voltage_base, 10000); |
| if (selector) |
| *selector = (vsel & tps->voltage_reg_mask); |
| |
| /* |
| * 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, vsel, &new_vset_id); |
| |
| if (!found) { |
| ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id, |
| tps->voltage_reg_mask, vsel); |
| 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] = vsel; |
| } |
| |
| /* 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_voltage_time_sel(struct regulator_dev *rdev, |
| unsigned int old_selector, unsigned int new_selector) |
| { |
| struct tps62360_chip *tps = rdev_get_drvdata(rdev); |
| int old_uV, new_uV; |
| |
| old_uV = regulator_list_voltage_linear(rdev, old_selector); |
| if (old_uV < 0) |
| return old_uV; |
| |
| new_uV = regulator_list_voltage_linear(rdev, new_selector); |
| if (new_uV < 0) |
| return new_uV; |
| |
| return DIV_ROUND_UP(abs(old_uV - new_uV), tps->change_uv_per_us); |
| } |
| |
| static struct regulator_ops tps62360_dcdc_ops = { |
| .get_voltage_sel = tps62360_dcdc_get_voltage_sel, |
| .set_voltage = tps62360_dcdc_set_voltage, |
| .list_voltage = regulator_list_voltage_linear, |
| .set_voltage_time_sel = tps62360_set_voltage_time_sel, |
| }; |
| |
| static int __devinit tps62360_init_force_pwm(struct tps62360_chip *tps, |
| struct tps62360_regulator_platform_data *pdata, |
| int vset_id) |
| { |
| int ret; |
| int bit = 0; |
| |
| if (pdata->en_force_pwm) |
| bit = BIT(7); |
| |
| ret = regmap_update_bits(tps->regmap, REG_VSET0 + vset_id, BIT(7), bit); |
| if (ret < 0) |
| dev_err(tps->dev, |
| "%s(): register %d update failed with err %d\n", |
| __func__, REG_VSET0 + vset_id, ret); |
| return ret; |
| } |
| |
| static int __devinit tps62360_init_dcdc(struct tps62360_chip *tps, |
| struct tps62360_regulator_platform_data *pdata) |
| { |
| int ret; |
| int i; |
| 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; |
| } |
| |
| /* Initialize force PWM mode */ |
| if (tps->valid_gpios) { |
| for (i = 0; i < 4; ++i) { |
| ret = tps62360_init_force_pwm(tps, pdata, i); |
| if (ret < 0) |
| return ret; |
| } |
| } else { |
| ret = tps62360_init_force_pwm(tps, pdata, tps->curr_vset_id); |
| if (ret < 0) |
| 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 >> 4) & 0x7; |
| |
| /* ramp mV/us = 32/(2^ramp_ctrl) */ |
| tps->change_uv_per_us = 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) |
| { |
| struct tps62360_regulator_platform_data *pdata; |
| struct device_node *np = dev->of_node; |
| |
| pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
| if (!pdata) { |
| dev_err(dev, "Memory alloc failed for platform data\n"); |
| return NULL; |
| } |
| |
| pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node); |
| 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-force-pwm", NULL)) |
| pdata->en_force_pwm = 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 __devinit 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 = client->dev.platform_data; |
| chip_id = id->driver_data; |
| |
| 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)match->data; |
| if (!pdata) |
| pdata = of_get_tps62360_platform_data(&client->dev); |
| } |
| |
| if (!pdata) { |
| dev_err(&client->dev, "%s(): Platform data not found\n", |
| __func__); |
| return -EIO; |
| } |
| |
| tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); |
| if (!tps) { |
| dev_err(&client->dev, "%s(): Memory allocation failed\n", |
| __func__); |
| return -ENOMEM; |
| } |
| |
| tps->en_force_pwm = pdata->en_force_pwm; |
| 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->voltage_base = TPS62360_BASE_VOLTAGE; |
| tps->voltage_reg_mask = 0x3F; |
| tps->desc.n_voltages = TPS62360_N_VOLTAGES; |
| break; |
| case TPS62361: |
| case TPS62363: |
| tps->voltage_base = TPS62361_BASE_VOLTAGE; |
| tps->voltage_reg_mask = 0x7F; |
| tps->desc.n_voltages = TPS62361_N_VOLTAGES; |
| break; |
| default: |
| return -ENODEV; |
| } |
| |
| tps->desc.name = id->name; |
| tps->desc.id = 0; |
| tps->desc.ops = &tps62360_dcdc_ops; |
| tps->desc.type = REGULATOR_VOLTAGE; |
| tps->desc.owner = THIS_MODULE; |
| tps->desc.min_uV = tps->voltage_base; |
| tps->desc.uV_step = 10000; |
| |
| 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 = gpio_request_one(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); |
| goto err_gpio0; |
| } |
| |
| gpio_flags = (pdata->vsel1_def_state) ? |
| GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; |
| ret = gpio_request_one(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); |
| goto err_gpio1; |
| } |
| 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); |
| goto err_init; |
| } |
| |
| config.dev = &client->dev; |
| config.init_data = pdata->reg_init_data; |
| config.driver_data = tps; |
| |
| /* Register the regulators */ |
| rdev = regulator_register(&tps->desc, &config); |
| if (IS_ERR(rdev)) { |
| dev_err(tps->dev, |
| "%s(): regulator register failed with err %s\n", |
| __func__, id->name); |
| ret = PTR_ERR(rdev); |
| goto err_init; |
| } |
| |
| tps->rdev = rdev; |
| return 0; |
| |
| err_init: |
| if (gpio_is_valid(tps->vsel1_gpio)) |
| gpio_free(tps->vsel1_gpio); |
| err_gpio1: |
| if (gpio_is_valid(tps->vsel0_gpio)) |
| gpio_free(tps->vsel0_gpio); |
| err_gpio0: |
| return ret; |
| } |
| |
| /** |
| * tps62360_remove - tps62360 driver i2c remove handler |
| * @client: i2c driver client device structure |
| * |
| * Unregister TPS driver as an i2c client device driver |
| */ |
| static int __devexit tps62360_remove(struct i2c_client *client) |
| { |
| struct tps62360_chip *tps = i2c_get_clientdata(client); |
| |
| if (gpio_is_valid(tps->vsel1_gpio)) |
| gpio_free(tps->vsel1_gpio); |
| |
| if (gpio_is_valid(tps->vsel0_gpio)) |
| gpio_free(tps->vsel0_gpio); |
| |
| regulator_unregister(tps->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", |
| .owner = THIS_MODULE, |
| .of_match_table = of_match_ptr(tps62360_of_match), |
| }, |
| .probe = tps62360_probe, |
| .remove = __devexit_p(tps62360_remove), |
| .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"); |