kernel/drivers/regulator/tps6507x-regulator.c

   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) */
  49 static 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
  68 static 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
  78 struct 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
  87 static 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
 115 struct 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 };
 122 static 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
 135 static 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
 140 static 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
 158 out:
 159         mutex_unlock(&tps->io_lock);
 160         return err;
 161 }
 162
 163 static 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
 181 out:
 182         mutex_unlock(&tps->io_lock);
 183         return err;
 184 }
 185
 186 static 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
 200 static 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
 214 static 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
 232 static 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
 245 static 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
 259 static 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
 304 static 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
 352 static 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 static struct of_regulator_match tps6507x_matches[] = {
 363         { .name = "VDCDC1"},
 364         { .name = "VDCDC2"},
 365         { .name = "VDCDC3"},
 366         { .name = "LDO1"},
 367         { .name = "LDO2"},
 368 };
 369
 370 static struct tps6507x_board *tps6507x_parse_dt_reg_data(
 371                 struct platform_device *pdev,
 372                 struct of_regulator_match **tps6507x_reg_matches)
 373 {
 374         struct tps6507x_board *tps_board;
 375         struct device_node *np = pdev->dev.parent->of_node;
 376         struct device_node *regulators;
 377         struct of_regulator_match *matches;
 378         static struct regulator_init_data *reg_data;
 379         int idx = 0, count, ret;
 380
 381         tps_board = devm_kzalloc(&pdev->dev, sizeof(*tps_board),
 382                                         GFP_KERNEL);
 383         if (!tps_board)
 384                 return NULL;
 385
 386         regulators = of_get_child_by_name(np, "regulators");
 387         if (!regulators) {
 388                 dev_err(&pdev->dev, "regulator node not found\n");
 389                 return NULL;
 390         }
 391
 392         count = ARRAY_SIZE(tps6507x_matches);
 393         matches = tps6507x_matches;
 394
 395         ret = of_regulator_match(&pdev->dev, regulators, matches, count);
 396         of_node_put(regulators);
 397         if (ret < 0) {
 398                 dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
 399                         ret);
 400                 return NULL;
 401         }
 402
 403         *tps6507x_reg_matches = matches;
 404
 405         reg_data = devm_kzalloc(&pdev->dev, (sizeof(struct regulator_init_data)
 406                                         * TPS6507X_NUM_REGULATOR), GFP_KERNEL);
 407         if (!reg_data)
 408                 return NULL;
 409
 410         tps_board->tps6507x_pmic_init_data = reg_data;
 411
 412         for (idx = 0; idx < count; idx++) {
 413                 if (!matches[idx].init_data || !matches[idx].of_node)
 414                         continue;
 415
 416                 memcpy(&reg_data[idx], matches[idx].init_data,
 417                                 sizeof(struct regulator_init_data));
 418
 419         }
 420
 421         return tps_board;
 422 }
 423
 424 static int tps6507x_pmic_probe(struct platform_device *pdev)
 425 {
 426         struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
 427         struct tps_info *info = &tps6507x_pmic_regs[0];
 428         struct regulator_config config = { };
 429         struct regulator_init_data *init_data;
 430         struct regulator_dev *rdev;
 431         struct tps6507x_pmic *tps;
 432         struct tps6507x_board *tps_board;
 433         struct of_regulator_match *tps6507x_reg_matches = NULL;
 434         int i;
 435         int error;
 436         unsigned int prop;
 437
 438         /**
 439          * tps_board points to pmic related constants
 440          * coming from the board-evm file.
 441          */
 442
 443         tps_board = dev_get_platdata(tps6507x_dev->dev);
 444         if (IS_ENABLED(CONFIG_OF) && !tps_board &&
 445                 tps6507x_dev->dev->of_node)
 446                 tps_board = tps6507x_parse_dt_reg_data(pdev,
 447                                 &tps6507x_reg_matches);
 448         if (!tps_board)
 449                 return -EINVAL;
 450
 451         /**
 452          * init_data points to array of regulator_init structures
 453          * coming from the board-evm file.
 454          */
 455         init_data = tps_board->tps6507x_pmic_init_data;
 456         if (!init_data)
 457                 return -EINVAL;
 458
 459         tps = devm_kzalloc(&pdev->dev, sizeof(*tps), GFP_KERNEL);
 460         if (!tps)
 461                 return -ENOMEM;
 462
 463         mutex_init(&tps->io_lock);
 464
 465         /* common for all regulators */
 466         tps->mfd = tps6507x_dev;
 467
 468         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++, init_data++) {
 469                 /* Register the regulators */
 470                 tps->info[i] = info;
 471                 if (init_data->driver_data) {
 472                         struct tps6507x_reg_platform_data *data =
 473                                         init_data->driver_data;
 474                         tps->info[i]->defdcdc_default = data->defdcdc_default;
 475                 }
 476
 477                 tps->desc[i].name = info->name;
 478                 tps->desc[i].id = i;
 479                 tps->desc[i].n_voltages = info->table_len;
 480                 tps->desc[i].volt_table = info->table;
 481                 tps->desc[i].ops = &tps6507x_pmic_ops;
 482                 tps->desc[i].type = REGULATOR_VOLTAGE;
 483                 tps->desc[i].owner = THIS_MODULE;
 484
 485                 config.dev = tps6507x_dev->dev;
 486                 config.init_data = init_data;
 487                 config.driver_data = tps;
 488
 489                 if (tps6507x_reg_matches) {
 490                         error = of_property_read_u32(
 491                                 tps6507x_reg_matches[i].of_node,
 492                                         "ti,defdcdc_default", &prop);
 493
 494                         if (!error)
 495                                 tps->info[i]->defdcdc_default = prop;
 496
 497                         config.of_node = tps6507x_reg_matches[i].of_node;
 498                 }
 499
 500                 rdev = devm_regulator_register(&pdev->dev, &tps->desc[i],
 501                                                &config);
 502                 if (IS_ERR(rdev)) {
 503                         dev_err(tps6507x_dev->dev,
 504                                 "failed to register %s regulator\n",
 505                                 pdev->name);
 506                         return PTR_ERR(rdev);
 507                 }
 508
 509                 /* Save regulator for cleanup */
 510                 tps->rdev[i] = rdev;
 511         }
 512
 513         tps6507x_dev->pmic = tps;
 514         platform_set_drvdata(pdev, tps6507x_dev);
 515
 516         return 0;
 517 }
 518
 519 static struct platform_driver tps6507x_pmic_driver = {
 520         .driver = {
 521                 .name = "tps6507x-pmic",
 522         },
 523         .probe = tps6507x_pmic_probe,
 524 };
 525
 526 static int __init tps6507x_pmic_init(void)
 527 {
 528         return platform_driver_register(&tps6507x_pmic_driver);
 529 }
 530 subsys_initcall(tps6507x_pmic_init);
 531
 532 static void __exit tps6507x_pmic_cleanup(void)
 533 {
 534         platform_driver_unregister(&tps6507x_pmic_driver);
 535 }
 536 module_exit(tps6507x_pmic_cleanup);
 537
 538 MODULE_AUTHOR("Texas Instruments");
 539 MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
 540 MODULE_LICENSE("GPL v2");
 541 MODULE_ALIAS("platform:tps6507x-pmic");