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 tps_info *info[TPS6507X_NUM_REGULATOR];
 119         struct mutex io_lock;
 120 };
 121 static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
 122 {
 123         u8 val;
 124         int err;
 125
 126         err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);
 127
 128         if (err)
 129                 return err;
 130
 131         return val;
 132 }
 133
 134 static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
 135 {
 136         return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
 137 }
 138
 139 static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
 140 {
 141         int err, data;
 142
 143         mutex_lock(&tps->io_lock);
 144
 145         data = tps6507x_pmic_read(tps, reg);
 146         if (data < 0) {
 147                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 148                 err = data;
 149                 goto out;
 150         }
 151
 152         data |= mask;
 153         err = tps6507x_pmic_write(tps, reg, data);
 154         if (err)
 155                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 156
 157 out:
 158         mutex_unlock(&tps->io_lock);
 159         return err;
 160 }
 161
 162 static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
 163 {
 164         int err, data;
 165
 166         mutex_lock(&tps->io_lock);
 167
 168         data = tps6507x_pmic_read(tps, reg);
 169         if (data < 0) {
 170                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 171                 err = data;
 172                 goto out;
 173         }
 174
 175         data &= ~mask;
 176         err = tps6507x_pmic_write(tps, reg, data);
 177         if (err)
 178                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 179
 180 out:
 181         mutex_unlock(&tps->io_lock);
 182         return err;
 183 }
 184
 185 static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
 186 {
 187         int data;
 188
 189         mutex_lock(&tps->io_lock);
 190
 191         data = tps6507x_pmic_read(tps, reg);
 192         if (data < 0)
 193                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 194
 195         mutex_unlock(&tps->io_lock);
 196         return data;
 197 }
 198
 199 static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
 200 {
 201         int err;
 202
 203         mutex_lock(&tps->io_lock);
 204
 205         err = tps6507x_pmic_write(tps, reg, val);
 206         if (err < 0)
 207                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 208
 209         mutex_unlock(&tps->io_lock);
 210         return err;
 211 }
 212
 213 static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
 214 {
 215         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 216         int data, rid = rdev_get_id(dev);
 217         u8 shift;
 218
 219         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 220                 return -EINVAL;
 221
 222         shift = TPS6507X_MAX_REG_ID - rid;
 223         data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
 224
 225         if (data < 0)
 226                 return data;
 227         else
 228                 return (data & 1<<shift) ? 1 : 0;
 229 }
 230
 231 static int tps6507x_pmic_enable(struct regulator_dev *dev)
 232 {
 233         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 234         int rid = rdev_get_id(dev);
 235         u8 shift;
 236
 237         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 238                 return -EINVAL;
 239
 240         shift = TPS6507X_MAX_REG_ID - rid;
 241         return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
 242 }
 243
 244 static int tps6507x_pmic_disable(struct regulator_dev *dev)
 245 {
 246         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 247         int rid = rdev_get_id(dev);
 248         u8 shift;
 249
 250         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 251                 return -EINVAL;
 252
 253         shift = TPS6507X_MAX_REG_ID - rid;
 254         return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
 255                                         1 << shift);
 256 }
 257
 258 static int tps6507x_pmic_get_voltage_sel(struct regulator_dev *dev)
 259 {
 260         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 261         int data, rid = rdev_get_id(dev);
 262         u8 reg, mask;
 263
 264         switch (rid) {
 265         case TPS6507X_DCDC_1:
 266                 reg = TPS6507X_REG_DEFDCDC1;
 267                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 268                 break;
 269         case TPS6507X_DCDC_2:
 270                 if (tps->info[rid]->defdcdc_default)
 271                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
 272                 else
 273                         reg = TPS6507X_REG_DEFDCDC2_LOW;
 274                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 275                 break;
 276         case TPS6507X_DCDC_3:
 277                 if (tps->info[rid]->defdcdc_default)
 278                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
 279                 else
 280                         reg = TPS6507X_REG_DEFDCDC3_LOW;
 281                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 282                 break;
 283         case TPS6507X_LDO_1:
 284                 reg = TPS6507X_REG_LDO_CTRL1;
 285                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
 286                 break;
 287         case TPS6507X_LDO_2:
 288                 reg = TPS6507X_REG_DEFLDO2;
 289                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
 290                 break;
 291         default:
 292                 return -EINVAL;
 293         }
 294
 295         data = tps6507x_pmic_reg_read(tps, reg);
 296         if (data < 0)
 297                 return data;
 298
 299         data &= mask;
 300         return data;
 301 }
 302
 303 static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
 304                                           unsigned selector)
 305 {
 306         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 307         int data, rid = rdev_get_id(dev);
 308         u8 reg, mask;
 309
 310         switch (rid) {
 311         case TPS6507X_DCDC_1:
 312                 reg = TPS6507X_REG_DEFDCDC1;
 313                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 314                 break;
 315         case TPS6507X_DCDC_2:
 316                 if (tps->info[rid]->defdcdc_default)
 317                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
 318                 else
 319                         reg = TPS6507X_REG_DEFDCDC2_LOW;
 320                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 321                 break;
 322         case TPS6507X_DCDC_3:
 323                 if (tps->info[rid]->defdcdc_default)
 324                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
 325                 else
 326                         reg = TPS6507X_REG_DEFDCDC3_LOW;
 327                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 328                 break;
 329         case TPS6507X_LDO_1:
 330                 reg = TPS6507X_REG_LDO_CTRL1;
 331                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
 332                 break;
 333         case TPS6507X_LDO_2:
 334                 reg = TPS6507X_REG_DEFLDO2;
 335                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
 336                 break;
 337         default:
 338                 return -EINVAL;
 339         }
 340
 341         data = tps6507x_pmic_reg_read(tps, reg);
 342         if (data < 0)
 343                 return data;
 344
 345         data &= ~mask;
 346         data |= selector;
 347
 348         return tps6507x_pmic_reg_write(tps, reg, data);
 349 }
 350
 351 static const struct regulator_ops tps6507x_pmic_ops = {
 352         .is_enabled = tps6507x_pmic_is_enabled,
 353         .enable = tps6507x_pmic_enable,
 354         .disable = tps6507x_pmic_disable,
 355         .get_voltage_sel = tps6507x_pmic_get_voltage_sel,
 356         .set_voltage_sel = tps6507x_pmic_set_voltage_sel,
 357         .list_voltage = regulator_list_voltage_table,
 358         .map_voltage = regulator_map_voltage_ascend,
 359 };
 360
 361 static int tps6507x_pmic_of_parse_cb(struct device_node *np,
 362                                      const struct regulator_desc *desc,
 363                                      struct regulator_config *config)
 364 {
 365         struct tps6507x_pmic *tps = config->driver_data;
 366         struct tps_info *info = tps->info[desc->id];
 367         u32 prop;
 368         int ret;
 369
 370         ret = of_property_read_u32(np, "ti,defdcdc_default", &prop);
 371         if (!ret)
 372                 info->defdcdc_default = prop;
 373
 374         return 0;
 375 }
 376
 377 static int tps6507x_pmic_probe(struct platform_device *pdev)
 378 {
 379         struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
 380         struct tps_info *info = &tps6507x_pmic_regs[0];
 381         struct regulator_config config = { };
 382         struct regulator_init_data *init_data = NULL;
 383         struct regulator_dev *rdev;
 384         struct tps6507x_pmic *tps;
 385         struct tps6507x_board *tps_board;
 386         int i;
 387
 388         /**
 389          * tps_board points to pmic related constants
 390          * coming from the board-evm file.
 391          */
 392
 393         tps_board = dev_get_platdata(tps6507x_dev->dev);
 394         if (tps_board)
 395                 init_data = tps_board->tps6507x_pmic_init_data;
 396
 397         tps = devm_kzalloc(&pdev->dev, sizeof(*tps), GFP_KERNEL);
 398         if (!tps)
 399                 return -ENOMEM;
 400
 401         mutex_init(&tps->io_lock);
 402
 403         /* common for all regulators */
 404         tps->mfd = tps6507x_dev;
 405
 406         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++) {
 407                 /* Register the regulators */
 408                 tps->info[i] = info;
 409                 if (init_data && init_data[i].driver_data) {
 410                         struct tps6507x_reg_platform_data *data =
 411                                         init_data[i].driver_data;
 412                         info->defdcdc_default = data->defdcdc_default;
 413                 }
 414
 415                 tps->desc[i].name = info->name;
 416                 tps->desc[i].of_match = of_match_ptr(info->name);
 417                 tps->desc[i].regulators_node = of_match_ptr("regulators");
 418                 tps->desc[i].of_parse_cb = tps6507x_pmic_of_parse_cb;
 419                 tps->desc[i].id = i;
 420                 tps->desc[i].n_voltages = info->table_len;
 421                 tps->desc[i].volt_table = info->table;
 422                 tps->desc[i].ops = &tps6507x_pmic_ops;
 423                 tps->desc[i].type = REGULATOR_VOLTAGE;
 424                 tps->desc[i].owner = THIS_MODULE;
 425
 426                 config.dev = tps6507x_dev->dev;
 427                 config.init_data = init_data;
 428                 config.driver_data = tps;
 429
 430                 rdev = devm_regulator_register(&pdev->dev, &tps->desc[i],
 431                                                &config);
 432                 if (IS_ERR(rdev)) {
 433                         dev_err(tps6507x_dev->dev,
 434                                 "failed to register %s regulator\n",
 435                                 pdev->name);
 436                         return PTR_ERR(rdev);
 437                 }
 438         }
 439
 440         tps6507x_dev->pmic = tps;
 441         platform_set_drvdata(pdev, tps6507x_dev);
 442
 443         return 0;
 444 }
 445
 446 static struct platform_driver tps6507x_pmic_driver = {
 447         .driver = {
 448                 .name = "tps6507x-pmic",
 449         },
 450         .probe = tps6507x_pmic_probe,
 451 };
 452
 453 static int __init tps6507x_pmic_init(void)
 454 {
 455         return platform_driver_register(&tps6507x_pmic_driver);
 456 }
 457 subsys_initcall(tps6507x_pmic_init);
 458
 459 static void __exit tps6507x_pmic_cleanup(void)
 460 {
 461         platform_driver_unregister(&tps6507x_pmic_driver);
 462 }
 463 module_exit(tps6507x_pmic_cleanup);
 464
 465 MODULE_AUTHOR("Texas Instruments");
 466 MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
 467 MODULE_LICENSE("GPL v2");
 468 MODULE_ALIAS("platform:tps6507x-pmic");