linux/drivers/regulator/tps62360-regulator.c
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   1/*
   2 * tps62360.c -- TI tps62360
   3 *
   4 * Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
   5 *
   6 * Copyright (c) 2012, NVIDIA Corporation.
   7 *
   8 * Author: Laxman Dewangan <ldewangan@nvidia.com>
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public License as
  12 * published by the Free Software Foundation version 2.
  13 *
  14 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
  15 * whether express or implied; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17 * General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  22 * 02111-1307, USA
  23 */
  24
  25#include <linux/kernel.h>
  26#include <linux/module.h>
  27#include <linux/init.h>
  28#include <linux/err.h>
  29#include <linux/of.h>
  30#include <linux/of_device.h>
  31#include <linux/of_gpio.h>
  32#include <linux/regulator/of_regulator.h>
  33#include <linux/platform_device.h>
  34#include <linux/regulator/driver.h>
  35#include <linux/regulator/machine.h>
  36#include <linux/regulator/tps62360.h>
  37#include <linux/gpio.h>
  38#include <linux/i2c.h>
  39#include <linux/slab.h>
  40#include <linux/regmap.h>
  41
  42/* Register definitions */
  43#define REG_VSET0               0
  44#define REG_VSET1               1
  45#define REG_VSET2               2
  46#define REG_VSET3               3
  47#define REG_CONTROL             4
  48#define REG_TEMP                5
  49#define REG_RAMPCTRL            6
  50#define REG_CHIPID              8
  51
  52#define FORCE_PWM_ENABLE        BIT(7)
  53
  54enum chips {TPS62360, TPS62361, TPS62362, TPS62363};
  55
  56#define TPS62360_BASE_VOLTAGE   770000
  57#define TPS62360_N_VOLTAGES     64
  58
  59#define TPS62361_BASE_VOLTAGE   500000
  60#define TPS62361_N_VOLTAGES     128
  61
  62/* tps 62360 chip information */
  63struct tps62360_chip {
  64        struct device *dev;
  65        struct regulator_desc desc;
  66        struct regulator_dev *rdev;
  67        struct regmap *regmap;
  68        int vsel0_gpio;
  69        int vsel1_gpio;
  70        u8 voltage_reg_mask;
  71        bool en_internal_pulldn;
  72        bool en_discharge;
  73        bool valid_gpios;
  74        int lru_index[4];
  75        int curr_vset_vsel[4];
  76        int curr_vset_id;
  77};
  78
  79/*
  80 * find_voltage_set_register: Find new voltage configuration register
  81 * (VSET) id.
  82 * The finding of the new VSET register will be based on the LRU mechanism.
  83 * Each VSET register will have different voltage configured . This
  84 * Function will look if any of the VSET register have requested voltage set
  85 * or not.
  86 *     - If it is already there then it will make that register as most
  87 *       recently used and return as found so that caller need not to set
  88 *       the VSET register but need to set the proper gpios to select this
  89 *       VSET register.
  90 *     - If requested voltage is not found then it will use the least
  91 *       recently mechanism to get new VSET register for new configuration
  92 *       and will return not_found so that caller need to set new VSET
  93 *       register and then gpios (both).
  94 */
  95static bool find_voltage_set_register(struct tps62360_chip *tps,
  96                int req_vsel, int *vset_reg_id)
  97{
  98        int i;
  99        bool found = false;
 100        int new_vset_reg = tps->lru_index[3];
 101        int found_index = 3;
 102
 103        for (i = 0; i < 4; ++i) {
 104                if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {
 105                        new_vset_reg = tps->lru_index[i];
 106                        found_index = i;
 107                        found = true;
 108                        goto update_lru_index;
 109                }
 110        }
 111
 112update_lru_index:
 113        for (i = found_index; i > 0; i--)
 114                tps->lru_index[i] = tps->lru_index[i - 1];
 115
 116        tps->lru_index[0] = new_vset_reg;
 117        *vset_reg_id = new_vset_reg;
 118        return found;
 119}
 120
 121static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev)
 122{
 123        struct tps62360_chip *tps = rdev_get_drvdata(dev);
 124        int vsel;
 125        unsigned int data;
 126        int ret;
 127
 128        ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
 129        if (ret < 0) {
 130                dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
 131                        __func__, REG_VSET0 + tps->curr_vset_id, ret);
 132                return ret;
 133        }
 134        vsel = (int)data & tps->voltage_reg_mask;
 135        return vsel;
 136}
 137
 138static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
 139                                         unsigned selector)
 140{
 141        struct tps62360_chip *tps = rdev_get_drvdata(dev);
 142        int ret;
 143        bool found = false;
 144        int new_vset_id = tps->curr_vset_id;
 145
 146        /*
 147         * If gpios are available to select the VSET register then least
 148         * recently used register for new configuration.
 149         */
 150        if (tps->valid_gpios)
 151                found = find_voltage_set_register(tps, selector, &new_vset_id);
 152
 153        if (!found) {
 154                ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
 155                                tps->voltage_reg_mask, selector);
 156                if (ret < 0) {
 157                        dev_err(tps->dev,
 158                                "%s(): register %d update failed with err %d\n",
 159                                 __func__, REG_VSET0 + new_vset_id, ret);
 160                        return ret;
 161                }
 162                tps->curr_vset_id = new_vset_id;
 163                tps->curr_vset_vsel[new_vset_id] = selector;
 164        }
 165
 166        /* Select proper VSET register vio gpios */
 167        if (tps->valid_gpios) {
 168                gpio_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1);
 169                gpio_set_value_cansleep(tps->vsel1_gpio,
 170                                        (new_vset_id >> 1) & 0x1);
 171        }
 172        return 0;
 173}
 174
 175static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode)
 176{
 177        struct tps62360_chip *tps = rdev_get_drvdata(rdev);
 178        int i;
 179        int val;
 180        int ret;
 181
 182        /* Enable force PWM mode in FAST mode only. */
 183        switch (mode) {
 184        case REGULATOR_MODE_FAST:
 185                val = FORCE_PWM_ENABLE;
 186                break;
 187
 188        case REGULATOR_MODE_NORMAL:
 189                val = 0;
 190                break;
 191
 192        default:
 193                return -EINVAL;
 194        }
 195
 196        if (!tps->valid_gpios) {
 197                ret = regmap_update_bits(tps->regmap,
 198                        REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
 199                if (ret < 0)
 200                        dev_err(tps->dev,
 201                                "%s(): register %d update failed with err %d\n",
 202                                __func__, REG_VSET0 + tps->curr_vset_id, ret);
 203                return ret;
 204        }
 205
 206        /* If gpios are valid then all register set need to be control */
 207        for (i = 0; i < 4; ++i) {
 208                ret = regmap_update_bits(tps->regmap,
 209                                        REG_VSET0 + i, FORCE_PWM_ENABLE, val);
 210                if (ret < 0) {
 211                        dev_err(tps->dev,
 212                                "%s(): register %d update failed with err %d\n",
 213                                __func__, REG_VSET0 + i, ret);
 214                        return ret;
 215                }
 216        }
 217        return ret;
 218}
 219
 220static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
 221{
 222        struct tps62360_chip *tps = rdev_get_drvdata(rdev);
 223        unsigned int data;
 224        int ret;
 225
 226        ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
 227        if (ret < 0) {
 228                dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
 229                        __func__, REG_VSET0 + tps->curr_vset_id, ret);
 230                return ret;
 231        }
 232        return (data & FORCE_PWM_ENABLE) ?
 233                                REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
 234}
 235
 236static struct regulator_ops tps62360_dcdc_ops = {
 237        .get_voltage_sel        = tps62360_dcdc_get_voltage_sel,
 238        .set_voltage_sel        = tps62360_dcdc_set_voltage_sel,
 239        .list_voltage           = regulator_list_voltage_linear,
 240        .map_voltage            = regulator_map_voltage_linear,
 241        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 242        .set_mode               = tps62360_set_mode,
 243        .get_mode               = tps62360_get_mode,
 244};
 245
 246static int tps62360_init_dcdc(struct tps62360_chip *tps,
 247                struct tps62360_regulator_platform_data *pdata)
 248{
 249        int ret;
 250        unsigned int ramp_ctrl;
 251
 252        /* Initialize internal pull up/down control */
 253        if (tps->en_internal_pulldn)
 254                ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
 255        else
 256                ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);
 257        if (ret < 0) {
 258                dev_err(tps->dev,
 259                        "%s(): register %d write failed with err %d\n",
 260                        __func__, REG_CONTROL, ret);
 261                return ret;
 262        }
 263
 264        /* Reset output discharge path to reduce power consumption */
 265        ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
 266        if (ret < 0) {
 267                dev_err(tps->dev,
 268                        "%s(): register %d update failed with err %d\n",
 269                        __func__, REG_RAMPCTRL, ret);
 270                return ret;
 271        }
 272
 273        /* Get ramp value from ramp control register */
 274        ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
 275        if (ret < 0) {
 276                dev_err(tps->dev,
 277                        "%s(): register %d read failed with err %d\n",
 278                        __func__, REG_RAMPCTRL, ret);
 279                return ret;
 280        }
 281        ramp_ctrl = (ramp_ctrl >> 5) & 0x7;
 282
 283        /* ramp mV/us = 32/(2^ramp_ctrl) */
 284        tps->desc.ramp_delay = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
 285        return ret;
 286}
 287
 288static const struct regmap_config tps62360_regmap_config = {
 289        .reg_bits               = 8,
 290        .val_bits               = 8,
 291        .max_register           = REG_CHIPID,
 292        .cache_type             = REGCACHE_RBTREE,
 293};
 294
 295static struct tps62360_regulator_platform_data *
 296        of_get_tps62360_platform_data(struct device *dev)
 297{
 298        struct tps62360_regulator_platform_data *pdata;
 299        struct device_node *np = dev->of_node;
 300
 301        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 302        if (!pdata) {
 303                dev_err(dev, "Memory alloc failed for platform data\n");
 304                return NULL;
 305        }
 306
 307        pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
 308        if (!pdata->reg_init_data) {
 309                dev_err(dev, "Not able to get OF regulator init data\n");
 310                return NULL;
 311        }
 312
 313        pdata->vsel0_gpio = of_get_named_gpio(np, "vsel0-gpio", 0);
 314        pdata->vsel1_gpio = of_get_named_gpio(np, "vsel1-gpio", 0);
 315
 316        if (of_find_property(np, "ti,vsel0-state-high", NULL))
 317                pdata->vsel0_def_state = 1;
 318
 319        if (of_find_property(np, "ti,vsel1-state-high", NULL))
 320                pdata->vsel1_def_state = 1;
 321
 322        if (of_find_property(np, "ti,enable-pull-down", NULL))
 323                pdata->en_internal_pulldn = true;
 324
 325        if (of_find_property(np, "ti,enable-vout-discharge", NULL))
 326                pdata->en_discharge = true;
 327
 328        return pdata;
 329}
 330
 331#if defined(CONFIG_OF)
 332static const struct of_device_id tps62360_of_match[] = {
 333         { .compatible = "ti,tps62360", .data = (void *)TPS62360},
 334         { .compatible = "ti,tps62361", .data = (void *)TPS62361},
 335         { .compatible = "ti,tps62362", .data = (void *)TPS62362},
 336         { .compatible = "ti,tps62363", .data = (void *)TPS62363},
 337        {},
 338};
 339MODULE_DEVICE_TABLE(of, tps62360_of_match);
 340#endif
 341
 342static int tps62360_probe(struct i2c_client *client,
 343                                     const struct i2c_device_id *id)
 344{
 345        struct regulator_config config = { };
 346        struct tps62360_regulator_platform_data *pdata;
 347        struct regulator_dev *rdev;
 348        struct tps62360_chip *tps;
 349        int ret;
 350        int i;
 351        int chip_id;
 352
 353        pdata = client->dev.platform_data;
 354
 355        if (client->dev.of_node) {
 356                const struct of_device_id *match;
 357                match = of_match_device(of_match_ptr(tps62360_of_match),
 358                                &client->dev);
 359                if (!match) {
 360                        dev_err(&client->dev, "Error: No device match found\n");
 361                        return -ENODEV;
 362                }
 363                chip_id = (int)match->data;
 364                if (!pdata)
 365                        pdata = of_get_tps62360_platform_data(&client->dev);
 366        } else if (id) {
 367                chip_id = id->driver_data;
 368        } else {
 369                dev_err(&client->dev, "No device tree match or id table match found\n");
 370                return -ENODEV;
 371        }
 372
 373        if (!pdata) {
 374                dev_err(&client->dev, "%s(): Platform data not found\n",
 375                                                __func__);
 376                return -EIO;
 377        }
 378
 379        tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 380        if (!tps) {
 381                dev_err(&client->dev, "%s(): Memory allocation failed\n",
 382                                                __func__);
 383                return -ENOMEM;
 384        }
 385
 386        tps->en_discharge = pdata->en_discharge;
 387        tps->en_internal_pulldn = pdata->en_internal_pulldn;
 388        tps->vsel0_gpio = pdata->vsel0_gpio;
 389        tps->vsel1_gpio = pdata->vsel1_gpio;
 390        tps->dev = &client->dev;
 391
 392        switch (chip_id) {
 393        case TPS62360:
 394        case TPS62362:
 395                tps->desc.min_uV = TPS62360_BASE_VOLTAGE;
 396                tps->voltage_reg_mask = 0x3F;
 397                tps->desc.n_voltages = TPS62360_N_VOLTAGES;
 398                break;
 399        case TPS62361:
 400        case TPS62363:
 401                tps->desc.min_uV = TPS62361_BASE_VOLTAGE;
 402                tps->voltage_reg_mask = 0x7F;
 403                tps->desc.n_voltages = TPS62361_N_VOLTAGES;
 404                break;
 405        default:
 406                return -ENODEV;
 407        }
 408
 409        tps->desc.name = client->name;
 410        tps->desc.id = 0;
 411        tps->desc.ops = &tps62360_dcdc_ops;
 412        tps->desc.type = REGULATOR_VOLTAGE;
 413        tps->desc.owner = THIS_MODULE;
 414        tps->desc.uV_step = 10000;
 415
 416        tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
 417        if (IS_ERR(tps->regmap)) {
 418                ret = PTR_ERR(tps->regmap);
 419                dev_err(&client->dev,
 420                        "%s(): regmap allocation failed with err %d\n",
 421                        __func__, ret);
 422                return ret;
 423        }
 424        i2c_set_clientdata(client, tps);
 425
 426        tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
 427                                (pdata->vsel0_def_state & 1);
 428        tps->lru_index[0] = tps->curr_vset_id;
 429        tps->valid_gpios = false;
 430
 431        if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) {
 432                int gpio_flags;
 433                gpio_flags = (pdata->vsel0_def_state) ?
 434                                GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
 435                ret = devm_gpio_request_one(&client->dev, tps->vsel0_gpio,
 436                                gpio_flags, "tps62360-vsel0");
 437                if (ret) {
 438                        dev_err(&client->dev,
 439                                "%s(): Could not obtain vsel0 GPIO %d: %d\n",
 440                                __func__, tps->vsel0_gpio, ret);
 441                        return ret;
 442                }
 443
 444                gpio_flags = (pdata->vsel1_def_state) ?
 445                                GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
 446                ret = devm_gpio_request_one(&client->dev, tps->vsel1_gpio,
 447                                gpio_flags, "tps62360-vsel1");
 448                if (ret) {
 449                        dev_err(&client->dev,
 450                                "%s(): Could not obtain vsel1 GPIO %d: %d\n",
 451                                __func__, tps->vsel1_gpio, ret);
 452                        return ret;
 453                }
 454                tps->valid_gpios = true;
 455
 456                /*
 457                 * Initialize the lru index with vset_reg id
 458                 * The index 0 will be most recently used and
 459                 * set with the tps->curr_vset_id */
 460                for (i = 0; i < 4; ++i)
 461                        tps->lru_index[i] = i;
 462                tps->lru_index[0] = tps->curr_vset_id;
 463                tps->lru_index[tps->curr_vset_id] = 0;
 464        }
 465
 466        ret = tps62360_init_dcdc(tps, pdata);
 467        if (ret < 0) {
 468                dev_err(tps->dev, "%s(): Init failed with err = %d\n",
 469                                __func__, ret);
 470                return ret;
 471        }
 472
 473        config.dev = &client->dev;
 474        config.init_data = pdata->reg_init_data;
 475        config.driver_data = tps;
 476        config.of_node = client->dev.of_node;
 477
 478        /* Register the regulators */
 479        rdev = regulator_register(&tps->desc, &config);
 480        if (IS_ERR(rdev)) {
 481                dev_err(tps->dev,
 482                        "%s(): regulator register failed with err %s\n",
 483                        __func__, id->name);
 484                return PTR_ERR(rdev);
 485        }
 486
 487        tps->rdev = rdev;
 488        return 0;
 489}
 490
 491/**
 492 * tps62360_remove - tps62360 driver i2c remove handler
 493 * @client: i2c driver client device structure
 494 *
 495 * Unregister TPS driver as an i2c client device driver
 496 */
 497static int tps62360_remove(struct i2c_client *client)
 498{
 499        struct tps62360_chip *tps = i2c_get_clientdata(client);
 500
 501        regulator_unregister(tps->rdev);
 502        return 0;
 503}
 504
 505static void tps62360_shutdown(struct i2c_client *client)
 506{
 507        struct tps62360_chip *tps = i2c_get_clientdata(client);
 508        int st;
 509
 510        if (!tps->en_discharge)
 511                return;
 512
 513        /* Configure the output discharge path */
 514        st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
 515        if (st < 0)
 516                dev_err(tps->dev,
 517                        "%s(): register %d update failed with err %d\n",
 518                        __func__, REG_RAMPCTRL, st);
 519}
 520
 521static const struct i2c_device_id tps62360_id[] = {
 522        {.name = "tps62360", .driver_data = TPS62360},
 523        {.name = "tps62361", .driver_data = TPS62361},
 524        {.name = "tps62362", .driver_data = TPS62362},
 525        {.name = "tps62363", .driver_data = TPS62363},
 526        {},
 527};
 528
 529MODULE_DEVICE_TABLE(i2c, tps62360_id);
 530
 531static struct i2c_driver tps62360_i2c_driver = {
 532        .driver = {
 533                .name = "tps62360",
 534                .owner = THIS_MODULE,
 535                .of_match_table = of_match_ptr(tps62360_of_match),
 536        },
 537        .probe = tps62360_probe,
 538        .remove = tps62360_remove,
 539        .shutdown = tps62360_shutdown,
 540        .id_table = tps62360_id,
 541};
 542
 543static int __init tps62360_init(void)
 544{
 545        return i2c_add_driver(&tps62360_i2c_driver);
 546}
 547subsys_initcall(tps62360_init);
 548
 549static void __exit tps62360_cleanup(void)
 550{
 551        i2c_del_driver(&tps62360_i2c_driver);
 552}
 553module_exit(tps62360_cleanup);
 554
 555MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 556MODULE_DESCRIPTION("TPS6236x voltage regulator driver");
 557MODULE_LICENSE("GPL v2");
 558
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