drivers/regulator/da9052-regulator.c

   1 /*
   2 * da9052-regulator.c: Regulator driver for DA9052
   3 *
   4 * Copyright(c) 2011 Dialog Semiconductor Ltd.
   5 *
   6 * Author: David Dajun Chen <dchen@diasemi.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 */
  14
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/init.h>
  18 #include <linux/err.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/regulator/driver.h>
  21 #include <linux/regulator/machine.h>
  22 #ifdef CONFIG_OF
  23 #include <linux/of.h>
  24 #include <linux/regulator/of_regulator.h>
  25 #endif
  26
  27 #include <linux/mfd/da9052/da9052.h>
  28 #include <linux/mfd/da9052/reg.h>
  29 #include <linux/mfd/da9052/pdata.h>
  30
  31 /* Buck step size */
  32 #define DA9052_BUCK_PERI_3uV_STEP               100000
  33 #define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV       24
  34 #define DA9052_CONST_3uV                        3000000
  35
  36 #define DA9052_MIN_UA           0
  37 #define DA9052_MAX_UA           3
  38 #define DA9052_CURRENT_RANGE    4
  39
  40 /* Bit masks */
  41 #define DA9052_BUCK_ILIM_MASK_EVEN      0x0c
  42 #define DA9052_BUCK_ILIM_MASK_ODD       0xc0
  43
  44 /* DA9052 REGULATOR IDs */
  45 #define DA9052_ID_BUCK1         0
  46 #define DA9052_ID_BUCK2         1
  47 #define DA9052_ID_BUCK3         2
  48 #define DA9052_ID_BUCK4         3
  49 #define DA9052_ID_LDO1          4
  50 #define DA9052_ID_LDO2          5
  51 #define DA9052_ID_LDO3          6
  52 #define DA9052_ID_LDO4          7
  53 #define DA9052_ID_LDO5          8
  54 #define DA9052_ID_LDO6          9
  55 #define DA9052_ID_LDO7          10
  56 #define DA9052_ID_LDO8          11
  57 #define DA9052_ID_LDO9          12
  58 #define DA9052_ID_LDO10         13
  59
  60 static const u32 da9052_current_limits[3][4] = {
  61         {700000, 800000, 1000000, 1200000},     /* DA9052-BC BUCKs */
  62         {1600000, 2000000, 2400000, 3000000},   /* DA9053-AA/Bx BUCK-CORE */
  63         {800000, 1000000, 1200000, 1500000},    /* DA9053-AA/Bx BUCK-PRO,
  64                                                  * BUCK-MEM and BUCK-PERI
  65                                                 */
  66 };
  67
  68 struct da9052_regulator_info {
  69         struct regulator_desc reg_desc;
  70         int step_uV;
  71         int min_uV;
  72         int max_uV;
  73         unsigned char activate_bit;
  74 };
  75
  76 struct da9052_regulator {
  77         struct da9052 *da9052;
  78         struct da9052_regulator_info *info;
  79         struct regulator_dev *rdev;
  80 };
  81
  82 static int verify_range(struct da9052_regulator_info *info,
  83                          int min_uV, int max_uV)
  84 {
  85         if (min_uV > info->max_uV || max_uV < info->min_uV)
  86                 return -EINVAL;
  87
  88         return 0;
  89 }
  90
  91 static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev)
  92 {
  93         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
  94         int offset = rdev_get_id(rdev);
  95         int ret, row = 2;
  96
  97         ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2);
  98         if (ret < 0)
  99                 return ret;
 100
 101         /* Determine the even or odd position of the buck current limit
 102          * register field
 103         */
 104         if (offset % 2 == 0)
 105                 ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2;
 106         else
 107                 ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6;
 108
 109         /* Select the appropriate current limit range */
 110         if (regulator->da9052->chip_id == DA9052)
 111                 row = 0;
 112         else if (offset == 0)
 113                 row = 1;
 114
 115         return da9052_current_limits[row][ret];
 116 }
 117
 118 static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA,
 119                                           int max_uA)
 120 {
 121         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 122         int offset = rdev_get_id(rdev);
 123         int reg_val = 0;
 124         int i, row = 2;
 125
 126         /* Select the appropriate current limit range */
 127         if (regulator->da9052->chip_id == DA9052)
 128                 row = 0;
 129         else if (offset == 0)
 130                 row = 1;
 131
 132         for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) {
 133                 if ((min_uA <= da9052_current_limits[row][i]) &&
 134                     (da9052_current_limits[row][i] <= max_uA)) {
 135                         reg_val = i;
 136                         break;
 137                 }
 138         }
 139
 140         if (i < 0)
 141                 return -EINVAL;
 142
 143         /* Determine the even or odd position of the buck current limit
 144          * register field
 145         */
 146         if (offset % 2 == 0)
 147                 return da9052_reg_update(regulator->da9052,
 148                                          DA9052_BUCKA_REG + offset/2,
 149                                          DA9052_BUCK_ILIM_MASK_EVEN,
 150                                          reg_val << 2);
 151         else
 152                 return da9052_reg_update(regulator->da9052,
 153                                          DA9052_BUCKA_REG + offset/2,
 154                                          DA9052_BUCK_ILIM_MASK_ODD,
 155                                          reg_val << 6);
 156 }
 157
 158 static int da9052_list_voltage(struct regulator_dev *rdev,
 159                                 unsigned int selector)
 160 {
 161         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 162         struct da9052_regulator_info *info = regulator->info;
 163         int id = rdev_get_id(rdev);
 164         int volt_uV;
 165
 166         if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
 167                 && (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) {
 168                 volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV)
 169                           + info->min_uV);
 170                 volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
 171                                     * (DA9052_BUCK_PERI_3uV_STEP);
 172         } else {
 173                 volt_uV = (selector * info->step_uV) + info->min_uV;
 174         }
 175
 176         if (volt_uV > info->max_uV)
 177                 return -EINVAL;
 178
 179         return volt_uV;
 180 }
 181
 182 static int da9052_map_voltage(struct regulator_dev *rdev,
 183                               int min_uV, int max_uV)
 184 {
 185         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 186         struct da9052_regulator_info *info = regulator->info;
 187         int id = rdev_get_id(rdev);
 188         int ret, sel;
 189
 190         ret = verify_range(info, min_uV, max_uV);
 191         if (ret < 0)
 192                 return ret;
 193
 194         if (min_uV < info->min_uV)
 195                 min_uV = info->min_uV;
 196
 197         if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
 198                 && (min_uV >= DA9052_CONST_3uV)) {
 199                         sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV +
 200                               DIV_ROUND_UP(min_uV - DA9052_CONST_3uV,
 201                                            DA9052_BUCK_PERI_3uV_STEP);
 202         } else {
 203                 sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
 204         }
 205
 206         ret = da9052_list_voltage(rdev, sel);
 207         if (ret < 0)
 208                 return ret;
 209
 210         return sel;
 211 }
 212
 213 static int da9052_regulator_set_voltage_sel(struct regulator_dev *rdev,
 214                                             unsigned int selector)
 215 {
 216         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 217         struct da9052_regulator_info *info = regulator->info;
 218         int id = rdev_get_id(rdev);
 219         int ret;
 220
 221         ret = da9052_reg_update(regulator->da9052, rdev->desc->vsel_reg,
 222                                 rdev->desc->vsel_mask, selector);
 223         if (ret < 0)
 224                 return ret;
 225
 226         /* Some LDOs and DCDCs are DVC controlled which requires enabling of
 227          * the activate bit to implment the changes on the output.
 228          */
 229         switch (id) {
 230         case DA9052_ID_BUCK1:
 231         case DA9052_ID_BUCK2:
 232         case DA9052_ID_BUCK3:
 233         case DA9052_ID_LDO2:
 234         case DA9052_ID_LDO3:
 235                 ret = da9052_reg_update(regulator->da9052, DA9052_SUPPLY_REG,
 236                                         info->activate_bit, info->activate_bit);
 237                 break;
 238         }
 239
 240         return ret;
 241 }
 242
 243 static int da9052_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
 244                                                  unsigned int old_sel,
 245                                                  unsigned int new_sel)
 246 {
 247         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 248         struct da9052_regulator_info *info = regulator->info;
 249         int id = rdev_get_id(rdev);
 250         int ret = 0;
 251
 252         /* The DVC controlled LDOs and DCDCs ramp with 6.25mV/µs after enabling
 253          * the activate bit.
 254          */
 255         switch (id) {
 256         case DA9052_ID_BUCK1:
 257         case DA9052_ID_BUCK2:
 258         case DA9052_ID_BUCK3:
 259         case DA9052_ID_LDO2:
 260         case DA9052_ID_LDO3:
 261                 ret = (new_sel - old_sel) * info->step_uV / 6250;
 262                 break;
 263         }
 264
 265         return ret;
 266 }
 267
 268 static struct regulator_ops da9052_dcdc_ops = {
 269         .get_current_limit = da9052_dcdc_get_current_limit,
 270         .set_current_limit = da9052_dcdc_set_current_limit,
 271
 272         .list_voltage = da9052_list_voltage,
 273         .map_voltage = da9052_map_voltage,
 274         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 275         .set_voltage_sel = da9052_regulator_set_voltage_sel,
 276         .set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
 277         .is_enabled = regulator_is_enabled_regmap,
 278         .enable = regulator_enable_regmap,
 279         .disable = regulator_disable_regmap,
 280 };
 281
 282 static struct regulator_ops da9052_ldo_ops = {
 283         .list_voltage = da9052_list_voltage,
 284         .map_voltage = da9052_map_voltage,
 285         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 286         .set_voltage_sel = da9052_regulator_set_voltage_sel,
 287         .set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
 288         .is_enabled = regulator_is_enabled_regmap,
 289         .enable = regulator_enable_regmap,
 290         .disable = regulator_disable_regmap,
 291 };
 292
 293 #define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \
 294 {\
 295         .reg_desc = {\
 296                 .name = #_id,\
 297                 .ops = &da9052_ldo_ops,\
 298                 .type = REGULATOR_VOLTAGE,\
 299                 .id = DA9052_ID_##_id,\
 300                 .n_voltages = (max - min) / step + 1, \
 301                 .owner = THIS_MODULE,\
 302                 .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 303                 .vsel_mask = (1 << (sbits)) - 1,\
 304                 .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 305                 .enable_mask = 1 << (ebits),\
 306         },\
 307         .min_uV = (min) * 1000,\
 308         .max_uV = (max) * 1000,\
 309         .step_uV = (step) * 1000,\
 310         .activate_bit = (abits),\
 311 }
 312
 313 #define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \
 314 {\
 315         .reg_desc = {\
 316                 .name = #_id,\
 317                 .ops = &da9052_dcdc_ops,\
 318                 .type = REGULATOR_VOLTAGE,\
 319                 .id = DA9052_ID_##_id,\
 320                 .n_voltages = (max - min) / step + 1, \
 321                 .owner = THIS_MODULE,\
 322                 .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 323                 .vsel_mask = (1 << (sbits)) - 1,\
 324                 .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 325                 .enable_mask = 1 << (ebits),\
 326         },\
 327         .min_uV = (min) * 1000,\
 328         .max_uV = (max) * 1000,\
 329         .step_uV = (step) * 1000,\
 330         .activate_bit = (abits),\
 331 }
 332
 333 static struct da9052_regulator_info da9052_regulator_info[] = {
 334         DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
 335         DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
 336         DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
 337         DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0),
 338         DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
 339         DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
 340         DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
 341         DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
 342         DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
 343         DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
 344         DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
 345         DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
 346         DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
 347         DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
 348 };
 349
 350 static struct da9052_regulator_info da9053_regulator_info[] = {
 351         DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
 352         DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
 353         DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
 354         DA9052_DCDC(BUCK4, 25, 925, 2500, 6, 6, 0),
 355         DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
 356         DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
 357         DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
 358         DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
 359         DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
 360         DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
 361         DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
 362         DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
 363         DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
 364         DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
 365 };
 366
 367 static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
 368                                                                  int id)
 369 {
 370         struct da9052_regulator_info *info;
 371         int i;
 372
 373         switch (chip_id) {
 374         case DA9052:
 375                 for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
 376                         info = &da9052_regulator_info[i];
 377                         if (info->reg_desc.id == id)
 378                                 return info;
 379                 }
 380                 break;
 381         case DA9053_AA:
 382         case DA9053_BA:
 383         case DA9053_BB:
 384         case DA9053_BC:
 385                 for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
 386                         info = &da9053_regulator_info[i];
 387                         if (info->reg_desc.id == id)
 388                                 return info;
 389                 }
 390                 break;
 391         }
 392
 393         return NULL;
 394 }
 395
 396 static int da9052_regulator_probe(struct platform_device *pdev)
 397 {
 398         const struct mfd_cell *cell = mfd_get_cell(pdev);
 399         struct regulator_config config = { };
 400         struct da9052_regulator *regulator;
 401         struct da9052 *da9052;
 402         struct da9052_pdata *pdata;
 403
 404         regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
 405                                  GFP_KERNEL);
 406         if (!regulator)
 407                 return -ENOMEM;
 408
 409         da9052 = dev_get_drvdata(pdev->dev.parent);
 410         pdata = dev_get_platdata(da9052->dev);
 411         regulator->da9052 = da9052;
 412
 413         regulator->info = find_regulator_info(regulator->da9052->chip_id,
 414                                               cell->id);
 415         if (regulator->info == NULL) {
 416                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 417                 return -EINVAL;
 418         }
 419
 420         config.dev = &pdev->dev;
 421         config.driver_data = regulator;
 422         config.regmap = da9052->regmap;
 423         if (pdata && pdata->regulators) {
 424                 config.init_data = pdata->regulators[cell->id];
 425         } else {
 426 #ifdef CONFIG_OF
 427                 struct device_node *nproot = da9052->dev->of_node;
 428                 struct device_node *np;
 429
 430                 if (!nproot)
 431                         return -ENODEV;
 432
 433                 nproot = of_get_child_by_name(nproot, "regulators");
 434                 if (!nproot)
 435                         return -ENODEV;
 436
 437                 for_each_child_of_node(nproot, np) {
 438                         if (!of_node_cmp(np->name,
 439                                          regulator->info->reg_desc.name)) {
 440                                 config.init_data = of_get_regulator_init_data(
 441                                         &pdev->dev, np,
 442                                         &regulator->info->reg_desc);
 443                                 config.of_node = np;
 444                                 break;
 445                         }
 446                 }
 447                 of_node_put(nproot);
 448 #endif
 449         }
 450
 451         regulator->rdev = devm_regulator_register(&pdev->dev,
 452                                                   &regulator->info->reg_desc,
 453                                                   &config);
 454         if (IS_ERR(regulator->rdev)) {
 455                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 456                         regulator->info->reg_desc.name);
 457                 return PTR_ERR(regulator->rdev);
 458         }
 459
 460         platform_set_drvdata(pdev, regulator);
 461
 462         return 0;
 463 }
 464
 465 static struct platform_driver da9052_regulator_driver = {
 466         .probe = da9052_regulator_probe,
 467         .driver = {
 468                 .name = "da9052-regulator",
 469         },
 470 };
 471
 472 static int __init da9052_regulator_init(void)
 473 {
 474         return platform_driver_register(&da9052_regulator_driver);
 475 }
 476 subsys_initcall(da9052_regulator_init);
 477
 478 static void __exit da9052_regulator_exit(void)
 479 {
 480         platform_driver_unregister(&da9052_regulator_driver);
 481 }
 482 module_exit(da9052_regulator_exit);
 483
 484 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 485 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
 486 MODULE_LICENSE("GPL");
 487 MODULE_ALIAS("platform:da9052-regulator");