linux/drivers/regulator/tps6507x-regulator.c
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   1/*
   2 * tps6507x-regulator.c
   3 *
   4 * Regulator driver for TPS65073 PMIC
   5 *
   6 * Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.com/
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation version 2.
  11 *
  12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
  13 * whether express or implied; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 * General Public License for more details.
  16 */
  17
  18#include <linux/kernel.h>
  19#include <linux/module.h>
  20#include <linux/init.h>
  21#include <linux/err.h>
  22#include <linux/platform_device.h>
  23#include <linux/regulator/driver.h>
  24#include <linux/regulator/machine.h>
  25#include <linux/regulator/tps6507x.h>
  26#include <linux/of.h>
  27#include <linux/slab.h>
  28#include <linux/mfd/tps6507x.h>
  29#include <linux/regulator/of_regulator.h>
  30
  31/* DCDC's */
  32#define TPS6507X_DCDC_1                         0
  33#define TPS6507X_DCDC_2                         1
  34#define TPS6507X_DCDC_3                         2
  35/* LDOs */
  36#define TPS6507X_LDO_1                          3
  37#define TPS6507X_LDO_2                          4
  38
  39#define TPS6507X_MAX_REG_ID                     TPS6507X_LDO_2
  40
  41/* Number of step-down converters available */
  42#define TPS6507X_NUM_DCDC                       3
  43/* Number of LDO voltage regulators  available */
  44#define TPS6507X_NUM_LDO                        2
  45/* Number of total regulators available */
  46#define TPS6507X_NUM_REGULATOR          (TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)
  47
  48/* Supported voltage values for regulators (in microVolts) */
  49static const unsigned int VDCDCx_VSEL_table[] = {
  50        725000, 750000, 775000, 800000,
  51        825000, 850000, 875000, 900000,
  52        925000, 950000, 975000, 1000000,
  53        1025000, 1050000, 1075000, 1100000,
  54        1125000, 1150000, 1175000, 1200000,
  55        1225000, 1250000, 1275000, 1300000,
  56        1325000, 1350000, 1375000, 1400000,
  57        1425000, 1450000, 1475000, 1500000,
  58        1550000, 1600000, 1650000, 1700000,
  59        1750000, 1800000, 1850000, 1900000,
  60        1950000, 2000000, 2050000, 2100000,
  61        2150000, 2200000, 2250000, 2300000,
  62        2350000, 2400000, 2450000, 2500000,
  63        2550000, 2600000, 2650000, 2700000,
  64        2750000, 2800000, 2850000, 2900000,
  65        3000000, 3100000, 3200000, 3300000,
  66};
  67
  68static const unsigned int LDO1_VSEL_table[] = {
  69        1000000, 1100000, 1200000, 1250000,
  70        1300000, 1350000, 1400000, 1500000,
  71        1600000, 1800000, 2500000, 2750000,
  72        2800000, 3000000, 3100000, 3300000,
  73};
  74
  75/* The voltage mapping table for LDO2 is the same as VDCDCx */
  76#define LDO2_VSEL_table VDCDCx_VSEL_table
  77
  78struct tps_info {
  79        const char *name;
  80        u8 table_len;
  81        const unsigned int *table;
  82
  83        /* Does DCDC high or the low register defines output voltage? */
  84        bool defdcdc_default;
  85};
  86
  87static struct tps_info tps6507x_pmic_regs[] = {
  88        {
  89                .name = "VDCDC1",
  90                .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
  91                .table = VDCDCx_VSEL_table,
  92        },
  93        {
  94                .name = "VDCDC2",
  95                .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
  96                .table = VDCDCx_VSEL_table,
  97        },
  98        {
  99                .name = "VDCDC3",
 100                .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 101                .table = VDCDCx_VSEL_table,
 102        },
 103        {
 104                .name = "LDO1",
 105                .table_len = ARRAY_SIZE(LDO1_VSEL_table),
 106                .table = LDO1_VSEL_table,
 107        },
 108        {
 109                .name = "LDO2",
 110                .table_len = ARRAY_SIZE(LDO2_VSEL_table),
 111                .table = LDO2_VSEL_table,
 112        },
 113};
 114
 115struct tps6507x_pmic {
 116        struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
 117        struct tps6507x_dev *mfd;
 118        struct regulator_dev *rdev[TPS6507X_NUM_REGULATOR];
 119        struct tps_info *info[TPS6507X_NUM_REGULATOR];
 120        struct mutex io_lock;
 121};
 122static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
 123{
 124        u8 val;
 125        int err;
 126
 127        err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);
 128
 129        if (err)
 130                return err;
 131
 132        return val;
 133}
 134
 135static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
 136{
 137        return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
 138}
 139
 140static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
 141{
 142        int err, data;
 143
 144        mutex_lock(&tps->io_lock);
 145
 146        data = tps6507x_pmic_read(tps, reg);
 147        if (data < 0) {
 148                dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 149                err = data;
 150                goto out;
 151        }
 152
 153        data |= mask;
 154        err = tps6507x_pmic_write(tps, reg, data);
 155        if (err)
 156                dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 157
 158out:
 159        mutex_unlock(&tps->io_lock);
 160        return err;
 161}
 162
 163static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
 164{
 165        int err, data;
 166
 167        mutex_lock(&tps->io_lock);
 168
 169        data = tps6507x_pmic_read(tps, reg);
 170        if (data < 0) {
 171                dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 172                err = data;
 173                goto out;
 174        }
 175
 176        data &= ~mask;
 177        err = tps6507x_pmic_write(tps, reg, data);
 178        if (err)
 179                dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 180
 181out:
 182        mutex_unlock(&tps->io_lock);
 183        return err;
 184}
 185
 186static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
 187{
 188        int data;
 189
 190        mutex_lock(&tps->io_lock);
 191
 192        data = tps6507x_pmic_read(tps, reg);
 193        if (data < 0)
 194                dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 195
 196        mutex_unlock(&tps->io_lock);
 197        return data;
 198}
 199
 200static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
 201{
 202        int err;
 203
 204        mutex_lock(&tps->io_lock);
 205
 206        err = tps6507x_pmic_write(tps, reg, val);
 207        if (err < 0)
 208                dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 209
 210        mutex_unlock(&tps->io_lock);
 211        return err;
 212}
 213
 214static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
 215{
 216        struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 217        int data, rid = rdev_get_id(dev);
 218        u8 shift;
 219
 220        if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 221                return -EINVAL;
 222
 223        shift = TPS6507X_MAX_REG_ID - rid;
 224        data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
 225
 226        if (data < 0)
 227                return data;
 228        else
 229                return (data & 1<<shift) ? 1 : 0;
 230}
 231
 232static int tps6507x_pmic_enable(struct regulator_dev *dev)
 233{
 234        struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 235        int rid = rdev_get_id(dev);
 236        u8 shift;
 237
 238        if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 239                return -EINVAL;
 240
 241        shift = TPS6507X_MAX_REG_ID - rid;
 242        return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
 243}
 244
 245static int tps6507x_pmic_disable(struct regulator_dev *dev)
 246{
 247        struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 248        int rid = rdev_get_id(dev);
 249        u8 shift;
 250
 251        if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 252                return -EINVAL;
 253
 254        shift = TPS6507X_MAX_REG_ID - rid;
 255        return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
 256                                        1 << shift);
 257}
 258
 259static int tps6507x_pmic_get_voltage_sel(struct regulator_dev *dev)
 260{
 261        struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 262        int data, rid = rdev_get_id(dev);
 263        u8 reg, mask;
 264
 265        switch (rid) {
 266        case TPS6507X_DCDC_1:
 267                reg = TPS6507X_REG_DEFDCDC1;
 268                mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 269                break;
 270        case TPS6507X_DCDC_2:
 271                if (tps->info[rid]->defdcdc_default)
 272                        reg = TPS6507X_REG_DEFDCDC2_HIGH;
 273                else
 274                        reg = TPS6507X_REG_DEFDCDC2_LOW;
 275                mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 276                break;
 277        case TPS6507X_DCDC_3:
 278                if (tps->info[rid]->defdcdc_default)
 279                        reg = TPS6507X_REG_DEFDCDC3_HIGH;
 280                else
 281                        reg = TPS6507X_REG_DEFDCDC3_LOW;
 282                mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 283                break;
 284        case TPS6507X_LDO_1:
 285                reg = TPS6507X_REG_LDO_CTRL1;
 286                mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
 287                break;
 288        case TPS6507X_LDO_2:
 289                reg = TPS6507X_REG_DEFLDO2;
 290                mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
 291                break;
 292        default:
 293                return -EINVAL;
 294        }
 295
 296        data = tps6507x_pmic_reg_read(tps, reg);
 297        if (data < 0)
 298                return data;
 299
 300        data &= mask;
 301        return data;
 302}
 303
 304static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
 305                                          unsigned selector)
 306{
 307        struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 308        int data, rid = rdev_get_id(dev);
 309        u8 reg, mask;
 310
 311        switch (rid) {
 312        case TPS6507X_DCDC_1:
 313                reg = TPS6507X_REG_DEFDCDC1;
 314                mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 315                break;
 316        case TPS6507X_DCDC_2:
 317                if (tps->info[rid]->defdcdc_default)
 318                        reg = TPS6507X_REG_DEFDCDC2_HIGH;
 319                else
 320                        reg = TPS6507X_REG_DEFDCDC2_LOW;
 321                mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 322                break;
 323        case TPS6507X_DCDC_3:
 324                if (tps->info[rid]->defdcdc_default)
 325                        reg = TPS6507X_REG_DEFDCDC3_HIGH;
 326                else
 327                        reg = TPS6507X_REG_DEFDCDC3_LOW;
 328                mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 329                break;
 330        case TPS6507X_LDO_1:
 331                reg = TPS6507X_REG_LDO_CTRL1;
 332                mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
 333                break;
 334        case TPS6507X_LDO_2:
 335                reg = TPS6507X_REG_DEFLDO2;
 336                mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
 337                break;
 338        default:
 339                return -EINVAL;
 340        }
 341
 342        data = tps6507x_pmic_reg_read(tps, reg);
 343        if (data < 0)
 344                return data;
 345
 346        data &= ~mask;
 347        data |= selector;
 348
 349        return tps6507x_pmic_reg_write(tps, reg, data);
 350}
 351
 352static struct regulator_ops tps6507x_pmic_ops = {
 353        .is_enabled = tps6507x_pmic_is_enabled,
 354        .enable = tps6507x_pmic_enable,
 355        .disable = tps6507x_pmic_disable,
 356        .get_voltage_sel = tps6507x_pmic_get_voltage_sel,
 357        .set_voltage_sel = tps6507x_pmic_set_voltage_sel,
 358        .list_voltage = regulator_list_voltage_table,
 359        .map_voltage = regulator_map_voltage_ascend,
 360};
 361
 362#ifdef CONFIG_OF
 363static struct of_regulator_match tps6507x_matches[] = {
 364        { .name = "VDCDC1"},
 365        { .name = "VDCDC2"},
 366        { .name = "VDCDC3"},
 367        { .name = "LDO1"},
 368        { .name = "LDO2"},
 369};
 370
 371static struct tps6507x_board *tps6507x_parse_dt_reg_data(
 372                struct platform_device *pdev,
 373                struct of_regulator_match **tps6507x_reg_matches)
 374{
 375        struct tps6507x_board *tps_board;
 376        struct device_node *np = pdev->dev.parent->of_node;
 377        struct device_node *regulators;
 378        struct of_regulator_match *matches;
 379        static struct regulator_init_data *reg_data;
 380        int idx = 0, count, ret;
 381
 382        tps_board = devm_kzalloc(&pdev->dev, sizeof(*tps_board),
 383                                        GFP_KERNEL);
 384        if (!tps_board) {
 385                dev_err(&pdev->dev, "Failure to alloc pdata for regulators.\n");
 386                return NULL;
 387        }
 388
 389        regulators = of_find_node_by_name(np, "regulators");
 390        if (!regulators) {
 391                dev_err(&pdev->dev, "regulator node not found\n");
 392                return NULL;
 393        }
 394
 395        count = ARRAY_SIZE(tps6507x_matches);
 396        matches = tps6507x_matches;
 397
 398        ret = of_regulator_match(&pdev->dev, regulators, matches, count);
 399        if (ret < 0) {
 400                dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
 401                        ret);
 402                return NULL;
 403        }
 404
 405        *tps6507x_reg_matches = matches;
 406
 407        reg_data = devm_kzalloc(&pdev->dev, (sizeof(struct regulator_init_data)
 408                                        * TPS6507X_NUM_REGULATOR), GFP_KERNEL);
 409        if (!reg_data) {
 410                dev_err(&pdev->dev, "Failure to alloc init data for regulators.\n");
 411                return NULL;
 412        }
 413
 414        tps_board->tps6507x_pmic_init_data = reg_data;
 415
 416        for (idx = 0; idx < count; idx++) {
 417                if (!matches[idx].init_data || !matches[idx].of_node)
 418                        continue;
 419
 420                memcpy(&reg_data[idx], matches[idx].init_data,
 421                                sizeof(struct regulator_init_data));
 422
 423        }
 424
 425        return tps_board;
 426}
 427#else
 428static inline struct tps6507x_board *tps6507x_parse_dt_reg_data(
 429                        struct platform_device *pdev,
 430                        struct of_regulator_match **tps6507x_reg_matches)
 431{
 432        *tps6507x_reg_matches = NULL;
 433        return NULL;
 434}
 435#endif
 436static int tps6507x_pmic_probe(struct platform_device *pdev)
 437{
 438        struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
 439        struct tps_info *info = &tps6507x_pmic_regs[0];
 440        struct regulator_config config = { };
 441        struct regulator_init_data *init_data;
 442        struct regulator_dev *rdev;
 443        struct tps6507x_pmic *tps;
 444        struct tps6507x_board *tps_board;
 445        struct of_regulator_match *tps6507x_reg_matches = NULL;
 446        int i;
 447        int error;
 448        unsigned int prop;
 449
 450        /**
 451         * tps_board points to pmic related constants
 452         * coming from the board-evm file.
 453         */
 454
 455        tps_board = dev_get_platdata(tps6507x_dev->dev);
 456        if (!tps_board && tps6507x_dev->dev->of_node)
 457                tps_board = tps6507x_parse_dt_reg_data(pdev,
 458                                                &tps6507x_reg_matches);
 459        if (!tps_board)
 460                return -EINVAL;
 461
 462        /**
 463         * init_data points to array of regulator_init structures
 464         * coming from the board-evm file.
 465         */
 466        init_data = tps_board->tps6507x_pmic_init_data;
 467        if (!init_data)
 468                return -EINVAL;
 469
 470        tps = devm_kzalloc(&pdev->dev, sizeof(*tps), GFP_KERNEL);
 471        if (!tps)
 472                return -ENOMEM;
 473
 474        mutex_init(&tps->io_lock);
 475
 476        /* common for all regulators */
 477        tps->mfd = tps6507x_dev;
 478
 479        for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++, init_data++) {
 480                /* Register the regulators */
 481                tps->info[i] = info;
 482                if (init_data->driver_data) {
 483                        struct tps6507x_reg_platform_data *data =
 484                                                        init_data->driver_data;
 485                        tps->info[i]->defdcdc_default = data->defdcdc_default;
 486                }
 487
 488                tps->desc[i].name = info->name;
 489                tps->desc[i].id = i;
 490                tps->desc[i].n_voltages = info->table_len;
 491                tps->desc[i].volt_table = info->table;
 492                tps->desc[i].ops = &tps6507x_pmic_ops;
 493                tps->desc[i].type = REGULATOR_VOLTAGE;
 494                tps->desc[i].owner = THIS_MODULE;
 495
 496                config.dev = tps6507x_dev->dev;
 497                config.init_data = init_data;
 498                config.driver_data = tps;
 499
 500                if (tps6507x_reg_matches) {
 501                        error = of_property_read_u32(
 502                                tps6507x_reg_matches[i].of_node,
 503                                        "ti,defdcdc_default", &prop);
 504
 505                        if (!error)
 506                                tps->info[i]->defdcdc_default = prop;
 507
 508                        config.of_node = tps6507x_reg_matches[i].of_node;
 509                }
 510
 511                rdev = regulator_register(&tps->desc[i], &config);
 512                if (IS_ERR(rdev)) {
 513                        dev_err(tps6507x_dev->dev,
 514                                "failed to register %s regulator\n",
 515                                pdev->name);
 516                        error = PTR_ERR(rdev);
 517                        goto fail;
 518                }
 519
 520                /* Save regulator for cleanup */
 521                tps->rdev[i] = rdev;
 522        }
 523
 524        tps6507x_dev->pmic = tps;
 525        platform_set_drvdata(pdev, tps6507x_dev);
 526
 527        return 0;
 528
 529fail:
 530        while (--i >= 0)
 531                regulator_unregister(tps->rdev[i]);
 532        return error;
 533}
 534
 535static int tps6507x_pmic_remove(struct platform_device *pdev)
 536{
 537        struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev);
 538        struct tps6507x_pmic *tps = tps6507x_dev->pmic;
 539        int i;
 540
 541        for (i = 0; i < TPS6507X_NUM_REGULATOR; i++)
 542                regulator_unregister(tps->rdev[i]);
 543        return 0;
 544}
 545
 546static struct platform_driver tps6507x_pmic_driver = {
 547        .driver = {
 548                .name = "tps6507x-pmic",
 549                .owner = THIS_MODULE,
 550        },
 551        .probe = tps6507x_pmic_probe,
 552        .remove = tps6507x_pmic_remove,
 553};
 554
 555static int __init tps6507x_pmic_init(void)
 556{
 557        return platform_driver_register(&tps6507x_pmic_driver);
 558}
 559subsys_initcall(tps6507x_pmic_init);
 560
 561static void __exit tps6507x_pmic_cleanup(void)
 562{
 563        platform_driver_unregister(&tps6507x_pmic_driver);
 564}
 565module_exit(tps6507x_pmic_cleanup);
 566
 567MODULE_AUTHOR("Texas Instruments");
 568MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
 569MODULE_LICENSE("GPL v2");
 570MODULE_ALIAS("platform:tps6507x-pmic");
 571
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