/* * tps62360.c -- TI tps62360 * * Driver for processor core supply tps62360 and tps62361B * * Copyright (c) 2012, NVIDIA Corporation. * * Author: Laxman Dewangan * * 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 #include #include #include #include #include #include #include #include #include #include #include #include /* 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}; #define TPS62360_BASE_VOLTAGE 770 #define TPS62360_N_VOLTAGES 64 #define TPS62361_BASE_VOLTAGE 500 #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; }; /* * 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(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: Error in reading register %d\n", __func__, REG_VSET0 + tps->curr_vset_id); return ret; } vsel = (int)data & tps->voltage_reg_mask; return (tps->voltage_base + vsel * 10) * 1000; } 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) return -EINVAL; if (min_uV > ((tps->voltage_base + (tps->desc.n_voltages - 1) * 10) * 1000)) return -EINVAL; if (max_uV < tps->voltage_base * 1000) return -EINVAL; vsel = DIV_ROUND_UP(min_uV - (tps->voltage_base * 1000), 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: Error in updating register %d\n", __func__, REG_VSET0 + new_vset_id); 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_dcdc_list_voltage(struct regulator_dev *dev, unsigned selector) { struct tps62360_chip *tps = rdev_get_drvdata(dev); if (selector >= tps->desc.n_voltages) return -EINVAL; return (tps->voltage_base + selector * 10) * 1000; } static struct regulator_ops tps62360_dcdc_ops = { .get_voltage = tps62360_dcdc_get_voltage, .set_voltage = tps62360_dcdc_set_voltage, .list_voltage = tps62360_dcdc_list_voltage, }; static int tps62360_init_force_pwm(struct tps62360_chip *tps, struct tps62360_regulator_platform_data *pdata, int vset_id) { unsigned int data; int ret; ret = regmap_read(tps->regmap, REG_VSET0 + vset_id, &data); if (ret < 0) { dev_err(tps->dev, "%s() fails in writing reg %d\n", __func__, REG_VSET0 + vset_id); return ret; } tps->curr_vset_vsel[vset_id] = data & tps->voltage_reg_mask; if (pdata->en_force_pwm) data |= BIT(7); else data &= ~BIT(7); ret = regmap_write(tps->regmap, REG_VSET0 + vset_id, data); if (ret < 0) dev_err(tps->dev, "%s() fails in writing reg %d\n", __func__, REG_VSET0 + vset_id); return ret; } static int tps62360_init_dcdc(struct tps62360_chip *tps, struct tps62360_regulator_platform_data *pdata) { int ret; int i; /* Initailize 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() fails in writing reg %d\n", __func__, REG_CONTROL); return ret; } /* Initailize 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() fails in updating reg %d\n", __func__, REG_RAMPCTRL); return ret; } static const struct regmap_config tps62360_regmap_config = { .reg_bits = 8, .val_bits = 8, }; static int __devinit tps62360_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct tps62360_regulator_platform_data *pdata; struct regulator_dev *rdev; struct tps62360_chip *tps; int ret; int i; pdata = client->dev.platform_data; if (!pdata) { dev_err(&client->dev, "%s() Err: Platform data not found\n", __func__); return -EIO; } tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); if (!tps) { dev_err(&client->dev, "%s() Err: Memory allocation fails\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; tps->voltage_base = (id->driver_data == TPS62360) ? TPS62360_BASE_VOLTAGE : TPS62361_BASE_VOLTAGE; tps->voltage_reg_mask = (id->driver_data == TPS62360) ? 0x3F : 0x7F; tps->desc.name = id->name; tps->desc.id = 0; tps->desc.n_voltages = (id->driver_data == TPS62360) ? TPS62360_N_VOLTAGES : TPS62361_N_VOLTAGES; tps->desc.ops = &tps62360_dcdc_ops; tps->desc.type = REGULATOR_VOLTAGE; tps->desc.owner = THIS_MODULE; tps->regmap = regmap_init_i2c(client, &tps62360_regmap_config); if (IS_ERR(tps->regmap)) { ret = PTR_ERR(tps->regmap); dev_err(&client->dev, "%s() Err: Failed to allocate register" "map: %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)) { ret = gpio_request(tps->vsel0_gpio, "tps62360-vsel0"); if (ret) { dev_err(&client->dev, "Err: Could not obtain vsel0 GPIO %d: %d\n", tps->vsel0_gpio, ret); goto err_gpio0; } ret = gpio_direction_output(tps->vsel0_gpio, pdata->vsel0_def_state); if (ret) { dev_err(&client->dev, "Err: Could not set direction of" "vsel0 GPIO %d: %d\n", tps->vsel0_gpio, ret); gpio_free(tps->vsel0_gpio); goto err_gpio0; } ret = gpio_request(tps->vsel1_gpio, "tps62360-vsel1"); if (ret) { dev_err(&client->dev, "Err: Could not obtain vsel1 GPIO %d: %d\n", tps->vsel1_gpio, ret); goto err_gpio1; } ret = gpio_direction_output(tps->vsel1_gpio, pdata->vsel1_def_state); if (ret) { dev_err(&client->dev, "Err: Could not set direction of" "vsel1 GPIO %d: %d\n", tps->vsel1_gpio, ret); gpio_free(tps->vsel1_gpio); 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() Err: Init fails with = %d\n", __func__, ret); goto err_init; } /* Register the regulators */ rdev = regulator_register(&tps->desc, &client->dev, &pdata->reg_init_data, tps, NULL); if (IS_ERR(rdev)) { dev_err(tps->dev, "%s() Err: Failed to register %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: regmap_exit(tps->regmap); 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); regmap_exit(tps->regmap); 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() fails in updating reg %d\n", __func__, REG_RAMPCTRL); } static const struct i2c_device_id tps62360_id[] = { {.name = "tps62360", .driver_data = TPS62360}, {.name = "tps62361", .driver_data = TPS62361}, {}, }; MODULE_DEVICE_TABLE(i2c, tps62360_id); static struct i2c_driver tps62360_i2c_driver = { .driver = { .name = "tps62360", .owner = THIS_MODULE, }, .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 "); MODULE_DESCRIPTION("TPS62360 voltage regulator driver"); MODULE_LICENSE("GPL v2");