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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * tps62360.c -- TI tps623604 *5 * Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.6 *7 * Copyright (c) 2012, NVIDIA Corporation.8 *9 * Author: Laxman Dewangan <ldewangan@nvidia.com>10 */11 12#include <linux/kernel.h>13#include <linux/module.h>14#include <linux/init.h>15#include <linux/err.h>16#include <linux/of.h>17#include <linux/of_device.h>18#include <linux/regulator/of_regulator.h>19#include <linux/platform_device.h>20#include <linux/regulator/driver.h>21#include <linux/regulator/machine.h>22#include <linux/regulator/tps62360.h>23#include <linux/gpio/consumer.h>24#include <linux/i2c.h>25#include <linux/slab.h>26#include <linux/regmap.h>27 28/* Register definitions */29#define REG_VSET0 030#define REG_VSET1 131#define REG_VSET2 232#define REG_VSET3 333#define REG_CONTROL 434#define REG_TEMP 535#define REG_RAMPCTRL 636#define REG_CHIPID 837 38#define FORCE_PWM_ENABLE BIT(7)39 40enum chips {TPS62360, TPS62361, TPS62362, TPS62363};41 42#define TPS62360_BASE_VOLTAGE 77000043#define TPS62360_N_VOLTAGES 6444 45#define TPS62361_BASE_VOLTAGE 50000046#define TPS62361_N_VOLTAGES 12847 48/* tps 62360 chip information */49struct tps62360_chip {50 struct device *dev;51 struct regulator_desc desc;52 struct regulator_dev *rdev;53 struct regmap *regmap;54 struct gpio_desc *vsel0_gpio;55 struct gpio_desc *vsel1_gpio;56 u8 voltage_reg_mask;57 bool en_internal_pulldn;58 bool en_discharge;59 bool valid_gpios;60 int lru_index[4];61 int curr_vset_vsel[4];62 int curr_vset_id;63};64 65/*66 * find_voltage_set_register: Find new voltage configuration register67 * (VSET) id.68 * The finding of the new VSET register will be based on the LRU mechanism.69 * Each VSET register will have different voltage configured . This70 * Function will look if any of the VSET register have requested voltage set71 * or not.72 * - If it is already there then it will make that register as most73 * recently used and return as found so that caller need not to set74 * the VSET register but need to set the proper gpios to select this75 * VSET register.76 * - If requested voltage is not found then it will use the least77 * recently mechanism to get new VSET register for new configuration78 * and will return not_found so that caller need to set new VSET79 * register and then gpios (both).80 */81static bool find_voltage_set_register(struct tps62360_chip *tps,82 int req_vsel, int *vset_reg_id)83{84 int i;85 bool found = false;86 int new_vset_reg = tps->lru_index[3];87 int found_index = 3;88 89 for (i = 0; i < 4; ++i) {90 if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {91 new_vset_reg = tps->lru_index[i];92 found_index = i;93 found = true;94 goto update_lru_index;95 }96 }97 98update_lru_index:99 for (i = found_index; i > 0; i--)100 tps->lru_index[i] = tps->lru_index[i - 1];101 102 tps->lru_index[0] = new_vset_reg;103 *vset_reg_id = new_vset_reg;104 return found;105}106 107static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev)108{109 struct tps62360_chip *tps = rdev_get_drvdata(dev);110 int vsel;111 unsigned int data;112 int ret;113 114 ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);115 if (ret < 0) {116 dev_err(tps->dev, "%s(): register %d read failed with err %d\n",117 __func__, REG_VSET0 + tps->curr_vset_id, ret);118 return ret;119 }120 vsel = (int)data & tps->voltage_reg_mask;121 return vsel;122}123 124static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,125 unsigned selector)126{127 struct tps62360_chip *tps = rdev_get_drvdata(dev);128 int ret;129 bool found = false;130 int new_vset_id = tps->curr_vset_id;131 132 /*133 * If gpios are available to select the VSET register then least134 * recently used register for new configuration.135 */136 if (tps->valid_gpios)137 found = find_voltage_set_register(tps, selector, &new_vset_id);138 139 if (!found) {140 ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,141 tps->voltage_reg_mask, selector);142 if (ret < 0) {143 dev_err(tps->dev,144 "%s(): register %d update failed with err %d\n",145 __func__, REG_VSET0 + new_vset_id, ret);146 return ret;147 }148 tps->curr_vset_id = new_vset_id;149 tps->curr_vset_vsel[new_vset_id] = selector;150 }151 152 /* Select proper VSET register vio gpios */153 if (tps->valid_gpios) {154 gpiod_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1);155 gpiod_set_value_cansleep(tps->vsel1_gpio,156 (new_vset_id >> 1) & 0x1);157 }158 return 0;159}160 161static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode)162{163 struct tps62360_chip *tps = rdev_get_drvdata(rdev);164 int i;165 int val;166 int ret;167 168 /* Enable force PWM mode in FAST mode only. */169 switch (mode) {170 case REGULATOR_MODE_FAST:171 val = FORCE_PWM_ENABLE;172 break;173 174 case REGULATOR_MODE_NORMAL:175 val = 0;176 break;177 178 default:179 return -EINVAL;180 }181 182 if (!tps->valid_gpios) {183 ret = regmap_update_bits(tps->regmap,184 REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);185 if (ret < 0)186 dev_err(tps->dev,187 "%s(): register %d update failed with err %d\n",188 __func__, REG_VSET0 + tps->curr_vset_id, ret);189 return ret;190 }191 192 /* If gpios are valid then all register set need to be control */193 for (i = 0; i < 4; ++i) {194 ret = regmap_update_bits(tps->regmap,195 REG_VSET0 + i, FORCE_PWM_ENABLE, val);196 if (ret < 0) {197 dev_err(tps->dev,198 "%s(): register %d update failed with err %d\n",199 __func__, REG_VSET0 + i, ret);200 return ret;201 }202 }203 return ret;204}205 206static unsigned int tps62360_get_mode(struct regulator_dev *rdev)207{208 struct tps62360_chip *tps = rdev_get_drvdata(rdev);209 unsigned int data;210 int ret;211 212 ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);213 if (ret < 0) {214 dev_err(tps->dev, "%s(): register %d read failed with err %d\n",215 __func__, REG_VSET0 + tps->curr_vset_id, ret);216 return ret;217 }218 return (data & FORCE_PWM_ENABLE) ?219 REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;220}221 222static const struct regulator_ops tps62360_dcdc_ops = {223 .get_voltage_sel = tps62360_dcdc_get_voltage_sel,224 .set_voltage_sel = tps62360_dcdc_set_voltage_sel,225 .list_voltage = regulator_list_voltage_linear,226 .map_voltage = regulator_map_voltage_linear,227 .set_voltage_time_sel = regulator_set_voltage_time_sel,228 .set_mode = tps62360_set_mode,229 .get_mode = tps62360_get_mode,230};231 232static int tps62360_init_dcdc(struct tps62360_chip *tps,233 struct tps62360_regulator_platform_data *pdata)234{235 int ret;236 unsigned int ramp_ctrl;237 238 /* Initialize internal pull up/down control */239 if (tps->en_internal_pulldn)240 ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);241 else242 ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);243 if (ret < 0) {244 dev_err(tps->dev,245 "%s(): register %d write failed with err %d\n",246 __func__, REG_CONTROL, ret);247 return ret;248 }249 250 /* Reset output discharge path to reduce power consumption */251 ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);252 if (ret < 0) {253 dev_err(tps->dev,254 "%s(): register %d update failed with err %d\n",255 __func__, REG_RAMPCTRL, ret);256 return ret;257 }258 259 /* Get ramp value from ramp control register */260 ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);261 if (ret < 0) {262 dev_err(tps->dev,263 "%s(): register %d read failed with err %d\n",264 __func__, REG_RAMPCTRL, ret);265 return ret;266 }267 ramp_ctrl = (ramp_ctrl >> 5) & 0x7;268 269 /* ramp mV/us = 32/(2^ramp_ctrl) */270 tps->desc.ramp_delay = DIV_ROUND_UP(32000, BIT(ramp_ctrl));271 return ret;272}273 274static const struct regmap_config tps62360_regmap_config = {275 .reg_bits = 8,276 .val_bits = 8,277 .max_register = REG_CHIPID,278 .cache_type = REGCACHE_MAPLE,279};280 281static struct tps62360_regulator_platform_data *282 of_get_tps62360_platform_data(struct device *dev,283 const struct regulator_desc *desc)284{285 struct tps62360_regulator_platform_data *pdata;286 struct device_node *np = dev->of_node;287 288 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);289 if (!pdata)290 return NULL;291 292 pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node,293 desc);294 if (!pdata->reg_init_data) {295 dev_err(dev, "Not able to get OF regulator init data\n");296 return NULL;297 }298 299 pdata->vsel0_def_state = of_property_read_bool(np, "ti,vsel0-state-high");300 pdata->vsel1_def_state = of_property_read_bool(np, "ti,vsel1-state-high");301 pdata->en_internal_pulldn = of_property_read_bool(np, "ti,enable-pull-down");302 pdata->en_discharge = of_property_read_bool(np, "ti,enable-vout-discharge");303 304 return pdata;305}306 307#if defined(CONFIG_OF)308static const struct of_device_id tps62360_of_match[] = {309 { .compatible = "ti,tps62360", .data = (void *)TPS62360},310 { .compatible = "ti,tps62361", .data = (void *)TPS62361},311 { .compatible = "ti,tps62362", .data = (void *)TPS62362},312 { .compatible = "ti,tps62363", .data = (void *)TPS62363},313 {},314};315MODULE_DEVICE_TABLE(of, tps62360_of_match);316#endif317 318static int tps62360_probe(struct i2c_client *client)319{320 const struct i2c_device_id *id = i2c_client_get_device_id(client);321 struct regulator_config config = { };322 struct tps62360_regulator_platform_data *pdata;323 struct regulator_dev *rdev;324 struct tps62360_chip *tps;325 int ret;326 int i;327 int chip_id;328 int gpio_flags;329 330 pdata = dev_get_platdata(&client->dev);331 332 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);333 if (!tps)334 return -ENOMEM;335 336 tps->desc.name = client->name;337 tps->desc.id = 0;338 tps->desc.ops = &tps62360_dcdc_ops;339 tps->desc.type = REGULATOR_VOLTAGE;340 tps->desc.owner = THIS_MODULE;341 tps->desc.uV_step = 10000;342 343 if (client->dev.of_node) {344 const struct of_device_id *match;345 match = of_match_device(of_match_ptr(tps62360_of_match),346 &client->dev);347 if (!match) {348 dev_err(&client->dev, "Error: No device match found\n");349 return -ENODEV;350 }351 chip_id = (int)(long)match->data;352 if (!pdata)353 pdata = of_get_tps62360_platform_data(&client->dev,354 &tps->desc);355 } else if (id) {356 chip_id = id->driver_data;357 } else {358 dev_err(&client->dev, "No device tree match or id table match found\n");359 return -ENODEV;360 }361 362 if (!pdata) {363 dev_err(&client->dev, "%s(): Platform data not found\n",364 __func__);365 return -EIO;366 }367 368 tps->en_discharge = pdata->en_discharge;369 tps->en_internal_pulldn = pdata->en_internal_pulldn;370 tps->dev = &client->dev;371 372 switch (chip_id) {373 case TPS62360:374 case TPS62362:375 tps->desc.min_uV = TPS62360_BASE_VOLTAGE;376 tps->voltage_reg_mask = 0x3F;377 tps->desc.n_voltages = TPS62360_N_VOLTAGES;378 break;379 case TPS62361:380 case TPS62363:381 tps->desc.min_uV = TPS62361_BASE_VOLTAGE;382 tps->voltage_reg_mask = 0x7F;383 tps->desc.n_voltages = TPS62361_N_VOLTAGES;384 break;385 default:386 return -ENODEV;387 }388 389 tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);390 if (IS_ERR(tps->regmap)) {391 ret = PTR_ERR(tps->regmap);392 dev_err(&client->dev,393 "%s(): regmap allocation failed with err %d\n",394 __func__, ret);395 return ret;396 }397 i2c_set_clientdata(client, tps);398 399 tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +400 (pdata->vsel0_def_state & 1);401 tps->lru_index[0] = tps->curr_vset_id;402 tps->valid_gpios = false;403 404 gpio_flags = (pdata->vsel0_def_state) ?405 GPIOD_OUT_HIGH : GPIOD_OUT_LOW;406 tps->vsel0_gpio = devm_gpiod_get_optional(&client->dev, "vsel0", gpio_flags);407 if (IS_ERR(tps->vsel0_gpio)) {408 dev_err(&client->dev,409 "%s(): Could not obtain vsel0 GPIO: %ld\n",410 __func__, PTR_ERR(tps->vsel0_gpio));411 return PTR_ERR(tps->vsel0_gpio);412 }413 414 gpio_flags = (pdata->vsel1_def_state) ?415 GPIOD_OUT_HIGH : GPIOD_OUT_LOW;416 tps->vsel1_gpio = devm_gpiod_get_optional(&client->dev, "vsel1", gpio_flags);417 if (IS_ERR(tps->vsel1_gpio)) {418 dev_err(&client->dev,419 "%s(): Could not obtain vsel1 GPIO: %ld\n",420 __func__, PTR_ERR(tps->vsel1_gpio));421 return PTR_ERR(tps->vsel1_gpio);422 }423 424 if (tps->vsel0_gpio != NULL && tps->vsel1_gpio != NULL) {425 tps->valid_gpios = true;426 427 /*428 * Initialize the lru index with vset_reg id429 * The index 0 will be most recently used and430 * set with the tps->curr_vset_id */431 for (i = 0; i < 4; ++i)432 tps->lru_index[i] = i;433 tps->lru_index[0] = tps->curr_vset_id;434 tps->lru_index[tps->curr_vset_id] = 0;435 }436 437 ret = tps62360_init_dcdc(tps, pdata);438 if (ret < 0) {439 dev_err(tps->dev, "%s(): Init failed with err = %d\n",440 __func__, ret);441 return ret;442 }443 444 config.dev = &client->dev;445 config.init_data = pdata->reg_init_data;446 config.driver_data = tps;447 config.of_node = client->dev.of_node;448 449 /* Register the regulators */450 rdev = devm_regulator_register(&client->dev, &tps->desc, &config);451 if (IS_ERR(rdev)) {452 dev_err(tps->dev,453 "%s(): regulator register failed with err %s\n",454 __func__, id->name);455 return PTR_ERR(rdev);456 }457 458 tps->rdev = rdev;459 return 0;460}461 462static void tps62360_shutdown(struct i2c_client *client)463{464 struct tps62360_chip *tps = i2c_get_clientdata(client);465 int st;466 467 if (!tps->en_discharge)468 return;469 470 /* Configure the output discharge path */471 st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));472 if (st < 0)473 dev_err(tps->dev,474 "%s(): register %d update failed with err %d\n",475 __func__, REG_RAMPCTRL, st);476}477 478static const struct i2c_device_id tps62360_id[] = {479 {.name = "tps62360", .driver_data = TPS62360},480 {.name = "tps62361", .driver_data = TPS62361},481 {.name = "tps62362", .driver_data = TPS62362},482 {.name = "tps62363", .driver_data = TPS62363},483 {},484};485 486MODULE_DEVICE_TABLE(i2c, tps62360_id);487 488static struct i2c_driver tps62360_i2c_driver = {489 .driver = {490 .name = "tps62360",491 .probe_type = PROBE_PREFER_ASYNCHRONOUS,492 .of_match_table = of_match_ptr(tps62360_of_match),493 },494 .probe = tps62360_probe,495 .shutdown = tps62360_shutdown,496 .id_table = tps62360_id,497};498 499static int __init tps62360_init(void)500{501 return i2c_add_driver(&tps62360_i2c_driver);502}503subsys_initcall(tps62360_init);504 505static void __exit tps62360_cleanup(void)506{507 i2c_del_driver(&tps62360_i2c_driver);508}509module_exit(tps62360_cleanup);510 511MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");512MODULE_DESCRIPTION("TPS6236x voltage regulator driver");513MODULE_LICENSE("GPL v2");514