drivers/regulator/tps65912-regulator.c

   1 /*
   2  * tps65912.c  --  TI tps65912
   3  *
   4  * Copyright 2011 Texas Instruments Inc.
   5  *
   6  * Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify it
   9  *  under  the terms of the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the License, or (at your
  11  *  option) any later version.
  12  *
  13  * This driver is based on wm8350 implementation.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/err.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regulator/driver.h>
  22 #include <linux/regulator/machine.h>
  23 #include <linux/delay.h>
  24 #include <linux/slab.h>
  25 #include <linux/gpio.h>
  26 #include <linux/mfd/tps65912.h>
  27
  28 /* DCDC's */
  29 #define TPS65912_REG_DCDC1      0
  30 #define TPS65912_REG_DCDC2      1
  31 #define TPS65912_REG_DCDC3      2
  32 #define TPS65912_REG_DCDC4      3
  33
  34 /* LDOs */
  35 #define TPS65912_REG_LDO1       4
  36 #define TPS65912_REG_LDO2       5
  37 #define TPS65912_REG_LDO3       6
  38 #define TPS65912_REG_LDO4       7
  39 #define TPS65912_REG_LDO5       8
  40 #define TPS65912_REG_LDO6       9
  41 #define TPS65912_REG_LDO7       10
  42 #define TPS65912_REG_LDO8       11
  43 #define TPS65912_REG_LDO9       12
  44 #define TPS65912_REG_LDO10      13
  45
  46 /* Number of step-down converters available */
  47 #define TPS65912_NUM_DCDC       4
  48
  49 /* Number of LDO voltage regulators  available */
  50 #define TPS65912_NUM_LDO        10
  51
  52 /* Number of total regulators available */
  53 #define TPS65912_NUM_REGULATOR          (TPS65912_NUM_DCDC + TPS65912_NUM_LDO)
  54
  55 #define TPS65912_REG_ENABLED    0x80
  56 #define OP_SELREG_MASK          0x40
  57 #define OP_SELREG_SHIFT         6
  58
  59 struct tps_info {
  60         const char *name;
  61 };
  62
  63 static struct tps_info tps65912_regs[] = {
  64         {
  65                 .name = "DCDC1",
  66         },
  67         {
  68                 .name = "DCDC2",
  69         },
  70         {
  71                 .name = "DCDC3",
  72         },
  73         {
  74                 .name = "DCDC4",
  75         },
  76         {
  77                 .name = "LDO1",
  78         },
  79         {
  80                 .name = "LDO2",
  81         },
  82         {
  83                 .name = "LDO3",
  84         },
  85         {
  86                 .name = "LDO4",
  87         },
  88         {
  89                 .name = "LDO5",
  90         },
  91         {
  92                 .name = "LDO6",
  93         },
  94         {
  95                 .name = "LDO7",
  96         },
  97         {
  98                 .name = "LDO8",
  99         },
 100         {
 101                 .name = "LDO9",
 102         },
 103         {
 104                 .name = "LDO10",
 105         },
 106 };
 107
 108 struct tps65912_reg {
 109         struct regulator_desc desc[TPS65912_NUM_REGULATOR];
 110         struct tps65912 *mfd;
 111         struct regulator_dev *rdev[TPS65912_NUM_REGULATOR];
 112         struct tps_info *info[TPS65912_NUM_REGULATOR];
 113         /* for read/write access */
 114         struct mutex io_lock;
 115         int mode;
 116         int (*get_ctrl_reg)(int);
 117         int dcdc_range[TPS65912_NUM_DCDC];
 118         int pwm_mode_reg;
 119         int eco_reg;
 120 };
 121
 122 static int tps65912_get_range(struct tps65912_reg *pmic, int id)
 123 {
 124         struct tps65912 *mfd = pmic->mfd;
 125         int range;
 126
 127         switch (id) {
 128         case TPS65912_REG_DCDC1:
 129                 range = tps65912_reg_read(mfd, TPS65912_DCDC1_LIMIT);
 130                 break;
 131         case TPS65912_REG_DCDC2:
 132                 range = tps65912_reg_read(mfd, TPS65912_DCDC2_LIMIT);
 133                 break;
 134         case TPS65912_REG_DCDC3:
 135                 range = tps65912_reg_read(mfd, TPS65912_DCDC3_LIMIT);
 136                 break;
 137         case TPS65912_REG_DCDC4:
 138                 range = tps65912_reg_read(mfd, TPS65912_DCDC4_LIMIT);
 139                 break;
 140         default:
 141                 return 0;
 142         }
 143
 144         if (range >= 0)
 145                 range = (range & DCDC_LIMIT_RANGE_MASK)
 146                         >> DCDC_LIMIT_RANGE_SHIFT;
 147
 148         pmic->dcdc_range[id] = range;
 149         return range;
 150 }
 151
 152 static unsigned long tps65912_vsel_to_uv_range0(u8 vsel)
 153 {
 154         unsigned long uv;
 155
 156         uv = ((vsel * 12500) + 500000);
 157         return uv;
 158 }
 159
 160 static unsigned long tps65912_vsel_to_uv_range1(u8 vsel)
 161 {
 162         unsigned long uv;
 163
 164          uv = ((vsel * 12500) + 700000);
 165         return uv;
 166 }
 167
 168 static unsigned long tps65912_vsel_to_uv_range2(u8 vsel)
 169 {
 170         unsigned long uv;
 171
 172         uv = ((vsel * 25000) + 500000);
 173         return uv;
 174 }
 175
 176 static unsigned long tps65912_vsel_to_uv_range3(u8 vsel)
 177 {
 178         unsigned long uv;
 179
 180         if (vsel == 0x3f)
 181                 uv = 3800000;
 182         else
 183                 uv = ((vsel * 50000) + 500000);
 184
 185         return uv;
 186 }
 187
 188 static unsigned long tps65912_vsel_to_uv_ldo(u8 vsel)
 189 {
 190         unsigned long uv = 0;
 191
 192         if (vsel <= 32)
 193                 uv = ((vsel * 25000) + 800000);
 194         else if (vsel > 32 && vsel <= 60)
 195                 uv = (((vsel - 32) * 50000) + 1600000);
 196         else if (vsel > 60)
 197                 uv = (((vsel - 60) * 100000) + 3000000);
 198
 199         return uv;
 200 }
 201
 202 static int tps65912_get_ctrl_register(int id)
 203 {
 204         if (id >= TPS65912_REG_DCDC1 && id <= TPS65912_REG_LDO4)
 205                 return id * 3 + TPS65912_DCDC1_AVS;
 206         else if (id >= TPS65912_REG_LDO5 && id <= TPS65912_REG_LDO10)
 207                 return id - TPS65912_REG_LDO5 + TPS65912_LDO5;
 208         else
 209                 return -EINVAL;
 210 }
 211
 212 static int tps65912_get_sel_register(struct tps65912_reg *pmic, int id)
 213 {
 214         struct tps65912 *mfd = pmic->mfd;
 215         int opvsel;
 216         u8 reg = 0;
 217
 218         if (id >= TPS65912_REG_DCDC1 && id <= TPS65912_REG_LDO4) {
 219                 opvsel = tps65912_reg_read(mfd, id * 3 + TPS65912_DCDC1_OP);
 220                 if (opvsel & OP_SELREG_MASK)
 221                         reg = id * 3 + TPS65912_DCDC1_AVS;
 222                 else
 223                         reg = id * 3 + TPS65912_DCDC1_OP;
 224         } else if (id >= TPS65912_REG_LDO5 && id <= TPS65912_REG_LDO10) {
 225                 reg = id - TPS65912_REG_LDO5 + TPS65912_LDO5;
 226         } else {
 227                 return -EINVAL;
 228         }
 229
 230         return reg;
 231 }
 232
 233 static int tps65912_get_mode_regiters(struct tps65912_reg *pmic, int id)
 234 {
 235         switch (id) {
 236         case TPS65912_REG_DCDC1:
 237                 pmic->pwm_mode_reg = TPS65912_DCDC1_CTRL;
 238                 pmic->eco_reg = TPS65912_DCDC1_AVS;
 239                 break;
 240         case TPS65912_REG_DCDC2:
 241                 pmic->pwm_mode_reg = TPS65912_DCDC2_CTRL;
 242                 pmic->eco_reg = TPS65912_DCDC2_AVS;
 243                 break;
 244         case TPS65912_REG_DCDC3:
 245                 pmic->pwm_mode_reg = TPS65912_DCDC3_CTRL;
 246                 pmic->eco_reg = TPS65912_DCDC3_AVS;
 247                 break;
 248         case TPS65912_REG_DCDC4:
 249                 pmic->pwm_mode_reg = TPS65912_DCDC4_CTRL;
 250                 pmic->eco_reg = TPS65912_DCDC4_AVS;
 251                 break;
 252         default:
 253                 return -EINVAL;
 254         }
 255
 256         return 0;
 257 }
 258
 259 static int tps65912_reg_is_enabled(struct regulator_dev *dev)
 260 {
 261         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
 262         struct tps65912 *mfd = pmic->mfd;
 263         int reg, value, id = rdev_get_id(dev);
 264
 265         if (id < TPS65912_REG_DCDC1 || id > TPS65912_REG_LDO10)
 266                 return -EINVAL;
 267
 268         reg = pmic->get_ctrl_reg(id);
 269         if (reg < 0)
 270                 return reg;
 271
 272         value = tps65912_reg_read(mfd, reg);
 273         if (value < 0)
 274                 return value;
 275
 276         return value & TPS65912_REG_ENABLED;
 277 }
 278
 279 static int tps65912_reg_enable(struct regulator_dev *dev)
 280 {
 281         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
 282         struct tps65912 *mfd = pmic->mfd;
 283         int id = rdev_get_id(dev);
 284         int reg;
 285
 286         if (id < TPS65912_REG_DCDC1 || id > TPS65912_REG_LDO10)
 287                 return -EINVAL;
 288
 289         reg = pmic->get_ctrl_reg(id);
 290         if (reg < 0)
 291                 return reg;
 292
 293         return tps65912_set_bits(mfd, reg, TPS65912_REG_ENABLED);
 294 }
 295
 296 static int tps65912_reg_disable(struct regulator_dev *dev)
 297 {
 298         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
 299         struct tps65912 *mfd = pmic->mfd;
 300         int id = rdev_get_id(dev), reg;
 301
 302         reg = pmic->get_ctrl_reg(id);
 303         if (reg < 0)
 304                 return reg;
 305
 306         return tps65912_clear_bits(mfd, reg, TPS65912_REG_ENABLED);
 307 }
 308
 309 static int tps65912_set_mode(struct regulator_dev *dev, unsigned int mode)
 310 {
 311         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
 312         struct tps65912 *mfd = pmic->mfd;
 313         int pwm_mode, eco, id = rdev_get_id(dev);
 314
 315         tps65912_get_mode_regiters(pmic, id);
 316
 317         pwm_mode = tps65912_reg_read(mfd, pmic->pwm_mode_reg);
 318         eco = tps65912_reg_read(mfd, pmic->eco_reg);
 319
 320         pwm_mode &= DCDCCTRL_DCDC_MODE_MASK;
 321         eco &= DCDC_AVS_ECO_MASK;
 322
 323         switch (mode) {
 324         case REGULATOR_MODE_FAST:
 325                 /* Verify if mode alredy set */
 326                 if (pwm_mode && !eco)
 327                         break;
 328                 tps65912_set_bits(mfd, pmic->pwm_mode_reg, DCDCCTRL_DCDC_MODE_MASK);
 329                 tps65912_clear_bits(mfd, pmic->eco_reg, DCDC_AVS_ECO_MASK);
 330                 break;
 331         case REGULATOR_MODE_NORMAL:
 332         case REGULATOR_MODE_IDLE:
 333                 if (!pwm_mode && !eco)
 334                         break;
 335                 tps65912_clear_bits(mfd, pmic->pwm_mode_reg, DCDCCTRL_DCDC_MODE_MASK);
 336                 tps65912_clear_bits(mfd, pmic->eco_reg, DCDC_AVS_ECO_MASK);
 337                 break;
 338         case REGULATOR_MODE_STANDBY:
 339                 if (!pwm_mode && eco)
 340                         break;
 341                 tps65912_clear_bits(mfd, pmic->pwm_mode_reg, DCDCCTRL_DCDC_MODE_MASK);
 342                 tps65912_set_bits(mfd, pmic->eco_reg, DCDC_AVS_ECO_MASK);
 343                 break;
 344         default:
 345                 return -EINVAL;
 346         }
 347
 348         return 0;
 349 }
 350
 351 static unsigned int tps65912_get_mode(struct regulator_dev *dev)
 352 {
 353         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
 354         struct tps65912 *mfd = pmic->mfd;
 355         int pwm_mode, eco, mode = 0, id = rdev_get_id(dev);
 356
 357         tps65912_get_mode_regiters(pmic, id);
 358
 359         pwm_mode = tps65912_reg_read(mfd, pmic->pwm_mode_reg);
 360         eco = tps65912_reg_read(mfd, pmic->eco_reg);
 361
 362         pwm_mode &= DCDCCTRL_DCDC_MODE_MASK;
 363         eco &= DCDC_AVS_ECO_MASK;
 364
 365         if (pwm_mode && !eco)
 366                 mode = REGULATOR_MODE_FAST;
 367         else if (!pwm_mode && !eco)
 368                 mode = REGULATOR_MODE_NORMAL;
 369         else if (!pwm_mode && eco)
 370                 mode = REGULATOR_MODE_STANDBY;
 371
 372         return mode;
 373 }
 374
 375 static int tps65912_list_voltage_dcdc(struct regulator_dev *dev,
 376                                         unsigned selector)
 377 {
 378         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
 379         int range, voltage = 0, id = rdev_get_id(dev);
 380
 381         if (id > TPS65912_REG_DCDC4)
 382                 return -EINVAL;
 383
 384         range = pmic->dcdc_range[id];
 385
 386         switch (range) {
 387         case 0:
 388                 /* 0.5 - 1.2875V in 12.5mV steps */
 389                 voltage = tps65912_vsel_to_uv_range0(selector);
 390                 break;
 391         case 1:
 392                 /* 0.7 - 1.4875V in 12.5mV steps */
 393                 voltage = tps65912_vsel_to_uv_range1(selector);
 394                 break;
 395         case 2:
 396                 /* 0.5 - 2.075V in 25mV steps */
 397                 voltage = tps65912_vsel_to_uv_range2(selector);
 398                 break;
 399         case 3:
 400                 /* 0.5 - 3.8V in 50mV steps */
 401                 voltage = tps65912_vsel_to_uv_range3(selector);
 402                 break;
 403         }
 404         return voltage;
 405 }
 406
 407 static int tps65912_get_voltage_dcdc(struct regulator_dev *dev)
 408 {
 409         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
 410         struct tps65912 *mfd = pmic->mfd;
 411         int id = rdev_get_id(dev);
 412         int reg, vsel;
 413
 414         reg = tps65912_get_sel_register(pmic, id);
 415         if (reg < 0)
 416                 return reg;
 417
 418         vsel = tps65912_reg_read(mfd, reg);
 419         vsel &= 0x3F;
 420
 421         return tps65912_list_voltage_dcdc(dev, vsel);
 422 }
 423
 424 static int tps65912_set_voltage_sel(struct regulator_dev *dev,
 425                                          unsigned selector)
 426 {
 427         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
 428         struct tps65912 *mfd = pmic->mfd;
 429         int id = rdev_get_id(dev);
 430         int value;
 431         u8 reg;
 432
 433         reg = tps65912_get_sel_register(pmic, id);
 434         value = tps65912_reg_read(mfd, reg);
 435         value &= 0xC0;
 436         return tps65912_reg_write(mfd, reg, selector | value);
 437 }
 438
 439 static int tps65912_get_voltage_ldo(struct regulator_dev *dev)
 440 {
 441         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
 442         struct tps65912 *mfd = pmic->mfd;
 443         int id = rdev_get_id(dev);
 444         int vsel = 0;
 445         u8 reg;
 446
 447         reg = tps65912_get_sel_register(pmic, id);
 448         vsel = tps65912_reg_read(mfd, reg);
 449         vsel &= 0x3F;
 450
 451         return tps65912_vsel_to_uv_ldo(vsel);
 452 }
 453
 454 static int tps65912_list_voltage_ldo(struct regulator_dev *dev,
 455                                         unsigned selector)
 456 {
 457         int ldo = rdev_get_id(dev);
 458
 459         if (ldo < TPS65912_REG_LDO1 || ldo > TPS65912_REG_LDO10)
 460                 return -EINVAL;
 461
 462         return tps65912_vsel_to_uv_ldo(selector);
 463 }
 464
 465 /* Operations permitted on DCDCx */
 466 static struct regulator_ops tps65912_ops_dcdc = {
 467         .is_enabled = tps65912_reg_is_enabled,
 468         .enable = tps65912_reg_enable,
 469         .disable = tps65912_reg_disable,
 470         .set_mode = tps65912_set_mode,
 471         .get_mode = tps65912_get_mode,
 472         .get_voltage = tps65912_get_voltage_dcdc,
 473         .set_voltage_sel = tps65912_set_voltage_sel,
 474         .list_voltage = tps65912_list_voltage_dcdc,
 475 };
 476
 477 /* Operations permitted on LDOx */
 478 static struct regulator_ops tps65912_ops_ldo = {
 479         .is_enabled = tps65912_reg_is_enabled,
 480         .enable = tps65912_reg_enable,
 481         .disable = tps65912_reg_disable,
 482         .get_voltage = tps65912_get_voltage_ldo,
 483         .set_voltage_sel = tps65912_set_voltage_sel,
 484         .list_voltage = tps65912_list_voltage_ldo,
 485 };
 486
 487 static __devinit int tps65912_probe(struct platform_device *pdev)
 488 {
 489         struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent);
 490         struct tps_info *info;
 491         struct regulator_init_data *reg_data;
 492         struct regulator_dev *rdev;
 493         struct tps65912_reg *pmic;
 494         struct tps65912_board *pmic_plat_data;
 495         int i, err;
 496
 497         pmic_plat_data = dev_get_platdata(tps65912->dev);
 498         if (!pmic_plat_data)
 499                 return -EINVAL;
 500
 501         reg_data = pmic_plat_data->tps65912_pmic_init_data;
 502
 503         pmic = kzalloc(sizeof(*pmic), GFP_KERNEL);
 504         if (!pmic)
 505                 return -ENOMEM;
 506
 507         mutex_init(&pmic->io_lock);
 508         pmic->mfd = tps65912;
 509         platform_set_drvdata(pdev, pmic);
 510
 511         pmic->get_ctrl_reg = &tps65912_get_ctrl_register;
 512         info = tps65912_regs;
 513
 514         for (i = 0; i < TPS65912_NUM_REGULATOR; i++, info++, reg_data++) {
 515                 int range = 0;
 516                 /* Register the regulators */
 517                 pmic->info[i] = info;
 518
 519                 pmic->desc[i].name = info->name;
 520                 pmic->desc[i].id = i;
 521                 pmic->desc[i].n_voltages = 64;
 522                 pmic->desc[i].ops = (i > TPS65912_REG_DCDC4 ?
 523                         &tps65912_ops_ldo : &tps65912_ops_dcdc);
 524                 pmic->desc[i].type = REGULATOR_VOLTAGE;
 525                 pmic->desc[i].owner = THIS_MODULE;
 526                 range = tps65912_get_range(pmic, i);
 527                 rdev = regulator_register(&pmic->desc[i],
 528                                         tps65912->dev, reg_data, pmic, NULL);
 529                 if (IS_ERR(rdev)) {
 530                         dev_err(tps65912->dev,
 531                                 "failed to register %s regulator\n",
 532                                 pdev->name);
 533                         err = PTR_ERR(rdev);
 534                         goto err;
 535                 }
 536
 537                 /* Save regulator for cleanup */
 538                 pmic->rdev[i] = rdev;
 539         }
 540         return 0;
 541
 542 err:
 543         while (--i >= 0)
 544                 regulator_unregister(pmic->rdev[i]);
 545
 546         kfree(pmic);
 547         return err;
 548 }
 549
 550 static int __devexit tps65912_remove(struct platform_device *pdev)
 551 {
 552         struct tps65912_reg *tps65912_reg = platform_get_drvdata(pdev);
 553         int i;
 554
 555         for (i = 0; i < TPS65912_NUM_REGULATOR; i++)
 556                 regulator_unregister(tps65912_reg->rdev[i]);
 557
 558         kfree(tps65912_reg);
 559         return 0;
 560 }
 561
 562 static struct platform_driver tps65912_driver = {
 563         .driver = {
 564                 .name = "tps65912-pmic",
 565                 .owner = THIS_MODULE,
 566         },
 567         .probe = tps65912_probe,
 568         .remove = __devexit_p(tps65912_remove),
 569 };
 570
 571 static int __init tps65912_init(void)
 572 {
 573         return platform_driver_register(&tps65912_driver);
 574 }
 575 subsys_initcall(tps65912_init);
 576
 577 static void __exit tps65912_cleanup(void)
 578 {
 579         platform_driver_unregister(&tps65912_driver);
 580 }
 581 module_exit(tps65912_cleanup);
 582
 583 MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>");
 584 MODULE_DESCRIPTION("TPS65912 voltage regulator driver");
 585 MODULE_LICENSE("GPL v2");
 586 MODULE_ALIAS("platform:tps65912-pmic");