/* * 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 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");