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 };
  74
  75 struct da9052_regulator {
  76         struct da9052 *da9052;
  77         struct da9052_regulator_info *info;
  78         struct regulator_dev *rdev;
  79 };
  80
  81 static int verify_range(struct da9052_regulator_info *info,
  82                          int min_uV, int max_uV)
  83 {
  84         if (min_uV > info->max_uV || max_uV < info->min_uV)
  85                 return -EINVAL;
  86
  87         return 0;
  88 }
  89
  90 static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev)
  91 {
  92         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
  93         int offset = rdev_get_id(rdev);
  94         int ret, row = 2;
  95
  96         ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2);
  97         if (ret < 0)
  98                 return ret;
  99
 100         /* Determine the even or odd position of the buck current limit
 101          * register field
 102         */
 103         if (offset % 2 == 0)
 104                 ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2;
 105         else
 106                 ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6;
 107
 108         /* Select the appropriate current limit range */
 109         if (regulator->da9052->chip_id == DA9052)
 110                 row = 0;
 111         else if (offset == 0)
 112                 row = 1;
 113
 114         return da9052_current_limits[row][ret];
 115 }
 116
 117 static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA,
 118                                           int max_uA)
 119 {
 120         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 121         int offset = rdev_get_id(rdev);
 122         int reg_val = 0;
 123         int i, row = 2;
 124
 125         /* Select the appropriate current limit range */
 126         if (regulator->da9052->chip_id == DA9052)
 127                 row = 0;
 128         else if (offset == 0)
 129                 row = 1;
 130
 131         for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) {
 132                 if ((min_uA <= da9052_current_limits[row][i]) &&
 133                     (da9052_current_limits[row][i] <= max_uA)) {
 134                         reg_val = i;
 135                         break;
 136                 }
 137         }
 138
 139         if (i < 0)
 140                 return -EINVAL;
 141
 142         /* Determine the even or odd position of the buck current limit
 143          * register field
 144         */
 145         if (offset % 2 == 0)
 146                 return da9052_reg_update(regulator->da9052,
 147                                          DA9052_BUCKA_REG + offset/2,
 148                                          DA9052_BUCK_ILIM_MASK_EVEN,
 149                                          reg_val << 2);
 150         else
 151                 return da9052_reg_update(regulator->da9052,
 152                                          DA9052_BUCKA_REG + offset/2,
 153                                          DA9052_BUCK_ILIM_MASK_ODD,
 154                                          reg_val << 6);
 155 }
 156
 157 static int da9052_list_voltage(struct regulator_dev *rdev,
 158                                 unsigned int selector)
 159 {
 160         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 161         struct da9052_regulator_info *info = regulator->info;
 162         int id = rdev_get_id(rdev);
 163         int volt_uV;
 164
 165         if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
 166                 && (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) {
 167                 volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV)
 168                           + info->min_uV);
 169                 volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
 170                                     * (DA9052_BUCK_PERI_3uV_STEP);
 171         } else {
 172                 volt_uV = (selector * info->step_uV) + info->min_uV;
 173         }
 174
 175         if (volt_uV > info->max_uV)
 176                 return -EINVAL;
 177
 178         return volt_uV;
 179 }
 180
 181 static int da9052_map_voltage(struct regulator_dev *rdev,
 182                               int min_uV, int max_uV)
 183 {
 184         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 185         struct da9052_regulator_info *info = regulator->info;
 186         int id = rdev_get_id(rdev);
 187         int ret, sel;
 188
 189         ret = verify_range(info, min_uV, max_uV);
 190         if (ret < 0)
 191                 return ret;
 192
 193         if (min_uV < info->min_uV)
 194                 min_uV = info->min_uV;
 195
 196         if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
 197                 && (min_uV >= DA9052_CONST_3uV)) {
 198                         sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV +
 199                               DIV_ROUND_UP(min_uV - DA9052_CONST_3uV,
 200                                            DA9052_BUCK_PERI_3uV_STEP);
 201         } else {
 202                 sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
 203         }
 204
 205         ret = da9052_list_voltage(rdev, sel);
 206         if (ret < 0)
 207                 return ret;
 208
 209         return sel;
 210 }
 211
 212 static struct regulator_ops da9052_dcdc_ops = {
 213         .get_current_limit = da9052_dcdc_get_current_limit,
 214         .set_current_limit = da9052_dcdc_set_current_limit,
 215
 216         .list_voltage = da9052_list_voltage,
 217         .map_voltage = da9052_map_voltage,
 218         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 219         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 220         .is_enabled = regulator_is_enabled_regmap,
 221         .enable = regulator_enable_regmap,
 222         .disable = regulator_disable_regmap,
 223 };
 224
 225 static struct regulator_ops da9052_ldo_ops = {
 226         .list_voltage = da9052_list_voltage,
 227         .map_voltage = da9052_map_voltage,
 228         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 229         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 230         .is_enabled = regulator_is_enabled_regmap,
 231         .enable = regulator_enable_regmap,
 232         .disable = regulator_disable_regmap,
 233 };
 234
 235 #define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \
 236 {\
 237         .reg_desc = {\
 238                 .name = #_id,\
 239                 .ops = &da9052_ldo_ops,\
 240                 .type = REGULATOR_VOLTAGE,\
 241                 .id = DA9052_ID_##_id,\
 242                 .n_voltages = (max - min) / step + 1, \
 243                 .owner = THIS_MODULE,\
 244                 .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 245                 .vsel_mask = (1 << (sbits)) - 1,\
 246                 .apply_reg = DA9052_SUPPLY_REG, \
 247                 .apply_bit = (abits), \
 248                 .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 249                 .enable_mask = 1 << (ebits),\
 250         },\
 251         .min_uV = (min) * 1000,\
 252         .max_uV = (max) * 1000,\
 253         .step_uV = (step) * 1000,\
 254 }
 255
 256 #define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \
 257 {\
 258         .reg_desc = {\
 259                 .name = #_id,\
 260                 .ops = &da9052_dcdc_ops,\
 261                 .type = REGULATOR_VOLTAGE,\
 262                 .id = DA9052_ID_##_id,\
 263                 .n_voltages = (max - min) / step + 1, \
 264                 .owner = THIS_MODULE,\
 265                 .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 266                 .vsel_mask = (1 << (sbits)) - 1,\
 267                 .apply_reg = DA9052_SUPPLY_REG, \
 268                 .apply_bit = (abits), \
 269                 .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 270                 .enable_mask = 1 << (ebits),\
 271         },\
 272         .min_uV = (min) * 1000,\
 273         .max_uV = (max) * 1000,\
 274         .step_uV = (step) * 1000,\
 275 }
 276
 277 static struct da9052_regulator_info da9052_regulator_info[] = {
 278         DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
 279         DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
 280         DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
 281         DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0),
 282         DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
 283         DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
 284         DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
 285         DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
 286         DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
 287         DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
 288         DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
 289         DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
 290         DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
 291         DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
 292 };
 293
 294 static struct da9052_regulator_info da9053_regulator_info[] = {
 295         DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
 296         DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
 297         DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
 298         DA9052_DCDC(BUCK4, 25, 925, 2500, 6, 6, 0),
 299         DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
 300         DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
 301         DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
 302         DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
 303         DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
 304         DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
 305         DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
 306         DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
 307         DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
 308         DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
 309 };
 310
 311 static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
 312                                                                  int id)
 313 {
 314         struct da9052_regulator_info *info;
 315         int i;
 316
 317         switch (chip_id) {
 318         case DA9052:
 319                 for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
 320                         info = &da9052_regulator_info[i];
 321                         if (info->reg_desc.id == id)
 322                                 return info;
 323                 }
 324                 break;
 325         case DA9053_AA:
 326         case DA9053_BA:
 327         case DA9053_BB:
 328                 for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
 329                         info = &da9053_regulator_info[i];
 330                         if (info->reg_desc.id == id)
 331                                 return info;
 332                 }
 333                 break;
 334         }
 335
 336         return NULL;
 337 }
 338
 339 static int da9052_regulator_probe(struct platform_device *pdev)
 340 {
 341         struct regulator_config config = { };
 342         struct da9052_regulator *regulator;
 343         struct da9052 *da9052;
 344         struct da9052_pdata *pdata;
 345
 346         regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
 347                                  GFP_KERNEL);
 348         if (!regulator)
 349                 return -ENOMEM;
 350
 351         da9052 = dev_get_drvdata(pdev->dev.parent);
 352         pdata = da9052->dev->platform_data;
 353         regulator->da9052 = da9052;
 354
 355         regulator->info = find_regulator_info(regulator->da9052->chip_id,
 356                                               pdev->id);
 357         if (regulator->info == NULL) {
 358                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 359                 return -EINVAL;
 360         }
 361
 362         config.dev = &pdev->dev;
 363         config.driver_data = regulator;
 364         config.regmap = da9052->regmap;
 365         if (pdata && pdata->regulators) {
 366                 config.init_data = pdata->regulators[pdev->id];
 367         } else {
 368 #ifdef CONFIG_OF
 369                 struct device_node *nproot, *np;
 370
 371                 nproot = of_node_get(da9052->dev->of_node);
 372                 if (!nproot)
 373                         return -ENODEV;
 374
 375                 nproot = of_find_node_by_name(nproot, "regulators");
 376                 if (!nproot)
 377                         return -ENODEV;
 378
 379                 for_each_child_of_node(nproot, np) {
 380                         if (!of_node_cmp(np->name,
 381                                          regulator->info->reg_desc.name)) {
 382                                 config.init_data = of_get_regulator_init_data(
 383                                         &pdev->dev, np);
 384                                 config.of_node = np;
 385                                 break;
 386                         }
 387                 }
 388                 of_node_put(nproot);
 389 #endif
 390         }
 391
 392         regulator->rdev = regulator_register(&regulator->info->reg_desc,
 393                                              &config);
 394         if (IS_ERR(regulator->rdev)) {
 395                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 396                         regulator->info->reg_desc.name);
 397                 return PTR_ERR(regulator->rdev);
 398         }
 399
 400         platform_set_drvdata(pdev, regulator);
 401
 402         return 0;
 403 }
 404
 405 static int da9052_regulator_remove(struct platform_device *pdev)
 406 {
 407         struct da9052_regulator *regulator = platform_get_drvdata(pdev);
 408
 409         regulator_unregister(regulator->rdev);
 410         return 0;
 411 }
 412
 413 static struct platform_driver da9052_regulator_driver = {
 414         .probe = da9052_regulator_probe,
 415         .remove = da9052_regulator_remove,
 416         .driver = {
 417                 .name = "da9052-regulator",
 418                 .owner = THIS_MODULE,
 419         },
 420 };
 421
 422 static int __init da9052_regulator_init(void)
 423 {
 424         return platform_driver_register(&da9052_regulator_driver);
 425 }
 426 subsys_initcall(da9052_regulator_init);
 427
 428 static void __exit da9052_regulator_exit(void)
 429 {
 430         platform_driver_unregister(&da9052_regulator_driver);
 431 }
 432 module_exit(da9052_regulator_exit);
 433
 434 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 435 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
 436 MODULE_LICENSE("GPL");
 437 MODULE_ALIAS("platform:da9052-regulator");