drivers/regulator/tps65023-regulator.c

   1 /*
   2  * tps65023-regulator.c
   3  *
   4  * Supports TPS65023 Regulator
   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/i2c.h>
  26 #include <linux/slab.h>
  27 #include <linux/regmap.h>
  28
  29 /* Register definitions */
  30 #define TPS65023_REG_VERSION            0
  31 #define TPS65023_REG_PGOODZ             1
  32 #define TPS65023_REG_MASK               2
  33 #define TPS65023_REG_REG_CTRL           3
  34 #define TPS65023_REG_CON_CTRL           4
  35 #define TPS65023_REG_CON_CTRL2          5
  36 #define TPS65023_REG_DEF_CORE           6
  37 #define TPS65023_REG_DEFSLEW            7
  38 #define TPS65023_REG_LDO_CTRL           8
  39
  40 /* PGOODZ bitfields */
  41 #define TPS65023_PGOODZ_PWRFAILZ        BIT(7)
  42 #define TPS65023_PGOODZ_LOWBATTZ        BIT(6)
  43 #define TPS65023_PGOODZ_VDCDC1          BIT(5)
  44 #define TPS65023_PGOODZ_VDCDC2          BIT(4)
  45 #define TPS65023_PGOODZ_VDCDC3          BIT(3)
  46 #define TPS65023_PGOODZ_LDO2            BIT(2)
  47 #define TPS65023_PGOODZ_LDO1            BIT(1)
  48
  49 /* MASK bitfields */
  50 #define TPS65023_MASK_PWRFAILZ          BIT(7)
  51 #define TPS65023_MASK_LOWBATTZ          BIT(6)
  52 #define TPS65023_MASK_VDCDC1            BIT(5)
  53 #define TPS65023_MASK_VDCDC2            BIT(4)
  54 #define TPS65023_MASK_VDCDC3            BIT(3)
  55 #define TPS65023_MASK_LDO2              BIT(2)
  56 #define TPS65023_MASK_LDO1              BIT(1)
  57
  58 /* REG_CTRL bitfields */
  59 #define TPS65023_REG_CTRL_VDCDC1_EN     BIT(5)
  60 #define TPS65023_REG_CTRL_VDCDC2_EN     BIT(4)
  61 #define TPS65023_REG_CTRL_VDCDC3_EN     BIT(3)
  62 #define TPS65023_REG_CTRL_LDO2_EN       BIT(2)
  63 #define TPS65023_REG_CTRL_LDO1_EN       BIT(1)
  64
  65 /* REG_CTRL2 bitfields */
  66 #define TPS65023_REG_CTRL2_GO           BIT(7)
  67 #define TPS65023_REG_CTRL2_CORE_ADJ     BIT(6)
  68 #define TPS65023_REG_CTRL2_DCDC2        BIT(2)
  69 #define TPS65023_REG_CTRL2_DCDC1        BIT(1)
  70 #define TPS65023_REG_CTRL2_DCDC3        BIT(0)
  71
  72 /* Number of step-down converters available */
  73 #define TPS65023_NUM_DCDC               3
  74 /* Number of LDO voltage regulators  available */
  75 #define TPS65023_NUM_LDO                2
  76 /* Number of total regulators available */
  77 #define TPS65023_NUM_REGULATOR  (TPS65023_NUM_DCDC + TPS65023_NUM_LDO)
  78
  79 /* DCDCs */
  80 #define TPS65023_DCDC_1                 0
  81 #define TPS65023_DCDC_2                 1
  82 #define TPS65023_DCDC_3                 2
  83 /* LDOs */
  84 #define TPS65023_LDO_1                  3
  85 #define TPS65023_LDO_2                  4
  86
  87 #define TPS65023_MAX_REG_ID             TPS65023_LDO_2
  88
  89 /* Supported voltage values for regulators */
  90 static const unsigned int VCORE_VSEL_table[] = {
  91         800000, 825000, 850000, 875000,
  92         900000, 925000, 950000, 975000,
  93         1000000, 1025000, 1050000, 1075000,
  94         1100000, 1125000, 1150000, 1175000,
  95         1200000, 1225000, 1250000, 1275000,
  96         1300000, 1325000, 1350000, 1375000,
  97         1400000, 1425000, 1450000, 1475000,
  98         1500000, 1525000, 1550000, 1600000,
  99 };
 100
 101 static const unsigned int DCDC_FIXED_3300000_VSEL_table[] = {
 102         3300000,
 103 };
 104
 105 static const unsigned int DCDC_FIXED_1800000_VSEL_table[] = {
 106         1800000,
 107 };
 108
 109 /* Supported voltage values for LDO regulators for tps65020 */
 110 static const unsigned int TPS65020_LDO1_VSEL_table[] = {
 111         1000000, 1050000, 1100000, 1300000,
 112         1800000, 2500000, 3000000, 3300000,
 113 };
 114
 115 static const unsigned int TPS65020_LDO2_VSEL_table[] = {
 116         1000000, 1050000, 1100000, 1300000,
 117         1800000, 2500000, 3000000, 3300000,
 118 };
 119
 120 /* Supported voltage values for LDO regulators
 121  * for tps65021 and tps65023 */
 122 static const unsigned int TPS65023_LDO1_VSEL_table[] = {
 123         1000000, 1100000, 1300000, 1800000,
 124         2200000, 2600000, 2800000, 3150000,
 125 };
 126
 127 static const unsigned int TPS65023_LDO2_VSEL_table[] = {
 128         1050000, 1200000, 1300000, 1800000,
 129         2500000, 2800000, 3000000, 3300000,
 130 };
 131
 132 /* Regulator specific details */
 133 struct tps_info {
 134         const char *name;
 135         u8 table_len;
 136         const unsigned int *table;
 137 };
 138
 139 /* PMIC details */
 140 struct tps_pmic {
 141         struct regulator_desc desc[TPS65023_NUM_REGULATOR];
 142         struct regulator_dev *rdev[TPS65023_NUM_REGULATOR];
 143         const struct tps_info *info[TPS65023_NUM_REGULATOR];
 144         struct regmap *regmap;
 145         u8 core_regulator;
 146 };
 147
 148 /* Struct passed as driver data */
 149 struct tps_driver_data {
 150         const struct tps_info *info;
 151         u8 core_regulator;
 152 };
 153
 154 static int tps65023_dcdc_get_voltage_sel(struct regulator_dev *dev)
 155 {
 156         struct tps_pmic *tps = rdev_get_drvdata(dev);
 157         int ret;
 158         int data, dcdc = rdev_get_id(dev);
 159
 160         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 161                 return -EINVAL;
 162
 163         if (dcdc == tps->core_regulator) {
 164                 ret = regmap_read(tps->regmap, TPS65023_REG_DEF_CORE, &data);
 165                 if (ret != 0)
 166                         return ret;
 167                 data &= (tps->info[dcdc]->table_len - 1);
 168                 return data;
 169         } else
 170                 return 0;
 171 }
 172
 173 static int tps65023_dcdc_set_voltage_sel(struct regulator_dev *dev,
 174                                          unsigned selector)
 175 {
 176         struct tps_pmic *tps = rdev_get_drvdata(dev);
 177         int dcdc = rdev_get_id(dev);
 178         int ret;
 179
 180         if (dcdc != tps->core_regulator)
 181                 return -EINVAL;
 182
 183         ret = regmap_write(tps->regmap, TPS65023_REG_DEF_CORE, selector);
 184         if (ret)
 185                 goto out;
 186
 187         /* Tell the chip that we have changed the value in DEFCORE
 188          * and its time to update the core voltage
 189          */
 190         ret = regmap_update_bits(tps->regmap, TPS65023_REG_CON_CTRL2,
 191                                  TPS65023_REG_CTRL2_GO, TPS65023_REG_CTRL2_GO);
 192
 193 out:
 194         return ret;
 195 }
 196
 197 /* Operations permitted on VDCDCx */
 198 static struct regulator_ops tps65023_dcdc_ops = {
 199         .is_enabled = regulator_is_enabled_regmap,
 200         .enable = regulator_enable_regmap,
 201         .disable = regulator_disable_regmap,
 202         .get_voltage_sel = tps65023_dcdc_get_voltage_sel,
 203         .set_voltage_sel = tps65023_dcdc_set_voltage_sel,
 204         .list_voltage = regulator_list_voltage_table,
 205 };
 206
 207 /* Operations permitted on LDOx */
 208 static struct regulator_ops tps65023_ldo_ops = {
 209         .is_enabled = regulator_is_enabled_regmap,
 210         .enable = regulator_enable_regmap,
 211         .disable = regulator_disable_regmap,
 212         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 213         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 214         .list_voltage = regulator_list_voltage_table,
 215 };
 216
 217 static struct regmap_config tps65023_regmap_config = {
 218         .reg_bits = 8,
 219         .val_bits = 8,
 220 };
 221
 222 static int tps_65023_probe(struct i2c_client *client,
 223                                      const struct i2c_device_id *id)
 224 {
 225         const struct tps_driver_data *drv_data = (void *)id->driver_data;
 226         const struct tps_info *info = drv_data->info;
 227         struct regulator_config config = { };
 228         struct regulator_init_data *init_data;
 229         struct regulator_dev *rdev;
 230         struct tps_pmic *tps;
 231         int i;
 232         int error;
 233
 234         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 235                 return -EIO;
 236
 237         /**
 238          * init_data points to array of regulator_init structures
 239          * coming from the board-evm file.
 240          */
 241         init_data = client->dev.platform_data;
 242         if (!init_data)
 243                 return -EIO;
 244
 245         tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 246         if (!tps)
 247                 return -ENOMEM;
 248
 249         tps->regmap = devm_regmap_init_i2c(client, &tps65023_regmap_config);
 250         if (IS_ERR(tps->regmap)) {
 251                 error = PTR_ERR(tps->regmap);
 252                 dev_err(&client->dev, "Failed to allocate register map: %d\n",
 253                         error);
 254                 return error;
 255         }
 256
 257         /* common for all regulators */
 258         tps->core_regulator = drv_data->core_regulator;
 259
 260         for (i = 0; i < TPS65023_NUM_REGULATOR; i++, info++, init_data++) {
 261                 /* Store regulator specific information */
 262                 tps->info[i] = info;
 263
 264                 tps->desc[i].name = info->name;
 265                 tps->desc[i].id = i;
 266                 tps->desc[i].n_voltages = info->table_len;
 267                 tps->desc[i].volt_table = info->table;
 268                 tps->desc[i].ops = (i > TPS65023_DCDC_3 ?
 269                                         &tps65023_ldo_ops : &tps65023_dcdc_ops);
 270                 tps->desc[i].type = REGULATOR_VOLTAGE;
 271                 tps->desc[i].owner = THIS_MODULE;
 272
 273                 tps->desc[i].enable_reg = TPS65023_REG_REG_CTRL;
 274                 switch (i) {
 275                 case TPS65023_LDO_1:
 276                         tps->desc[i].vsel_reg = TPS65023_REG_LDO_CTRL;
 277                         tps->desc[i].vsel_mask = 0x07;
 278                         tps->desc[i].enable_mask = 1 << 1;
 279                         break;
 280                 case TPS65023_LDO_2:
 281                         tps->desc[i].vsel_reg = TPS65023_REG_LDO_CTRL;
 282                         tps->desc[i].vsel_mask = 0x70;
 283                         tps->desc[i].enable_mask = 1 << 2;
 284                         break;
 285                 default: /* DCDCx */
 286                         tps->desc[i].enable_mask =
 287                                         1 << (TPS65023_NUM_REGULATOR - i);
 288                 }
 289
 290                 config.dev = &client->dev;
 291                 config.init_data = init_data;
 292                 config.driver_data = tps;
 293                 config.regmap = tps->regmap;
 294
 295                 /* Register the regulators */
 296                 rdev = regulator_register(&tps->desc[i], &config);
 297                 if (IS_ERR(rdev)) {
 298                         dev_err(&client->dev, "failed to register %s\n",
 299                                 id->name);
 300                         error = PTR_ERR(rdev);
 301                         goto fail;
 302                 }
 303
 304                 /* Save regulator for cleanup */
 305                 tps->rdev[i] = rdev;
 306         }
 307
 308         i2c_set_clientdata(client, tps);
 309
 310         /* Enable setting output voltage by I2C */
 311         regmap_update_bits(tps->regmap, TPS65023_REG_CON_CTRL2,
 312                         TPS65023_REG_CTRL2_CORE_ADJ, TPS65023_REG_CTRL2_CORE_ADJ);
 313
 314         return 0;
 315
 316  fail:
 317         while (--i >= 0)
 318                 regulator_unregister(tps->rdev[i]);
 319         return error;
 320 }
 321
 322 static int tps_65023_remove(struct i2c_client *client)
 323 {
 324         struct tps_pmic *tps = i2c_get_clientdata(client);
 325         int i;
 326
 327         for (i = 0; i < TPS65023_NUM_REGULATOR; i++)
 328                 regulator_unregister(tps->rdev[i]);
 329         return 0;
 330 }
 331
 332 static const struct tps_info tps65020_regs[] = {
 333         {
 334                 .name = "VDCDC1",
 335                 .table_len = ARRAY_SIZE(DCDC_FIXED_3300000_VSEL_table),
 336                 .table = DCDC_FIXED_3300000_VSEL_table,
 337         },
 338         {
 339                 .name = "VDCDC2",
 340                 .table_len = ARRAY_SIZE(DCDC_FIXED_1800000_VSEL_table),
 341                 .table = DCDC_FIXED_1800000_VSEL_table,
 342         },
 343         {
 344                 .name = "VDCDC3",
 345                 .table_len = ARRAY_SIZE(VCORE_VSEL_table),
 346                 .table = VCORE_VSEL_table,
 347         },
 348         {
 349                 .name = "LDO1",
 350                 .table_len = ARRAY_SIZE(TPS65020_LDO1_VSEL_table),
 351                 .table = TPS65020_LDO1_VSEL_table,
 352         },
 353         {
 354                 .name = "LDO2",
 355                 .table_len = ARRAY_SIZE(TPS65020_LDO2_VSEL_table),
 356                 .table = TPS65020_LDO2_VSEL_table,
 357         },
 358 };
 359
 360 static const struct tps_info tps65021_regs[] = {
 361         {
 362                 .name = "VDCDC1",
 363                 .table_len = ARRAY_SIZE(DCDC_FIXED_3300000_VSEL_table),
 364                 .table = DCDC_FIXED_3300000_VSEL_table,
 365         },
 366         {
 367                 .name = "VDCDC2",
 368                 .table_len = ARRAY_SIZE(DCDC_FIXED_1800000_VSEL_table),
 369                 .table = DCDC_FIXED_1800000_VSEL_table,
 370         },
 371         {
 372                 .name = "VDCDC3",
 373                 .table_len = ARRAY_SIZE(VCORE_VSEL_table),
 374                 .table = VCORE_VSEL_table,
 375         },
 376         {
 377                 .name = "LDO1",
 378                 .table_len = ARRAY_SIZE(TPS65023_LDO1_VSEL_table),
 379                 .table = TPS65023_LDO1_VSEL_table,
 380         },
 381         {
 382                 .name = "LDO2",
 383                 .table_len = ARRAY_SIZE(TPS65023_LDO2_VSEL_table),
 384                 .table = TPS65023_LDO2_VSEL_table,
 385         },
 386 };
 387
 388 static const struct tps_info tps65023_regs[] = {
 389         {
 390                 .name = "VDCDC1",
 391                 .table_len = ARRAY_SIZE(VCORE_VSEL_table),
 392                 .table = VCORE_VSEL_table,
 393         },
 394         {
 395                 .name = "VDCDC2",
 396                 .table_len = ARRAY_SIZE(DCDC_FIXED_3300000_VSEL_table),
 397                 .table = DCDC_FIXED_3300000_VSEL_table,
 398         },
 399         {
 400                 .name = "VDCDC3",
 401                 .table_len = ARRAY_SIZE(DCDC_FIXED_1800000_VSEL_table),
 402                 .table = DCDC_FIXED_1800000_VSEL_table,
 403         },
 404         {
 405                 .name = "LDO1",
 406                 .table_len = ARRAY_SIZE(TPS65023_LDO1_VSEL_table),
 407                 .table = TPS65023_LDO1_VSEL_table,
 408         },
 409         {
 410                 .name = "LDO2",
 411                 .table_len = ARRAY_SIZE(TPS65023_LDO2_VSEL_table),
 412                 .table = TPS65023_LDO2_VSEL_table,
 413         },
 414 };
 415
 416 static struct tps_driver_data tps65020_drv_data = {
 417         .info = tps65020_regs,
 418         .core_regulator = TPS65023_DCDC_3,
 419 };
 420
 421 static struct tps_driver_data tps65021_drv_data = {
 422         .info = tps65021_regs,
 423         .core_regulator = TPS65023_DCDC_3,
 424 };
 425
 426 static struct tps_driver_data tps65023_drv_data = {
 427         .info = tps65023_regs,
 428         .core_regulator = TPS65023_DCDC_1,
 429 };
 430
 431 static const struct i2c_device_id tps_65023_id[] = {
 432         {.name = "tps65023",
 433         .driver_data = (unsigned long) &tps65023_drv_data},
 434         {.name = "tps65021",
 435         .driver_data = (unsigned long) &tps65021_drv_data,},
 436         {.name = "tps65020",
 437         .driver_data = (unsigned long) &tps65020_drv_data},
 438         { },
 439 };
 440
 441 MODULE_DEVICE_TABLE(i2c, tps_65023_id);
 442
 443 static struct i2c_driver tps_65023_i2c_driver = {
 444         .driver = {
 445                 .name = "tps65023",
 446                 .owner = THIS_MODULE,
 447         },
 448         .probe = tps_65023_probe,
 449         .remove = tps_65023_remove,
 450         .id_table = tps_65023_id,
 451 };
 452
 453 static int __init tps_65023_init(void)
 454 {
 455         return i2c_add_driver(&tps_65023_i2c_driver);
 456 }
 457 subsys_initcall(tps_65023_init);
 458
 459 static void __exit tps_65023_cleanup(void)
 460 {
 461         i2c_del_driver(&tps_65023_i2c_driver);
 462 }
 463 module_exit(tps_65023_cleanup);
 464
 465 MODULE_AUTHOR("Texas Instruments");
 466 MODULE_DESCRIPTION("TPS65023 voltage regulator driver");
 467 MODULE_LICENSE("GPL v2");