drivers/regulator/db8500-prcmu.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  *
   4  * License Terms: GNU General Public License v2
   5  * Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
   6  *          Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
   7  *
   8  * Power domain regulators on DB8500
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/err.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/mfd/dbx500-prcmu.h>
  17 #include <linux/regulator/driver.h>
  18 #include <linux/regulator/machine.h>
  19 #include <linux/regulator/db8500-prcmu.h>
  20 #include <linux/regulator/of_regulator.h>
  21 #include <linux/of.h>
  22 #include <linux/module.h>
  23 #include "dbx500-prcmu.h"
  24
  25 static int db8500_regulator_enable(struct regulator_dev *rdev)
  26 {
  27         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
  28
  29         if (info == NULL)
  30                 return -EINVAL;
  31
  32         dev_vdbg(rdev_get_dev(rdev), "regulator-%s-enable\n",
  33                 info->desc.name);
  34
  35         if (!info->is_enabled) {
  36                 info->is_enabled = true;
  37                 if (!info->exclude_from_power_state)
  38                         power_state_active_enable();
  39         }
  40
  41         return 0;
  42 }
  43
  44 static int db8500_regulator_disable(struct regulator_dev *rdev)
  45 {
  46         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
  47         int ret = 0;
  48
  49         if (info == NULL)
  50                 return -EINVAL;
  51
  52         dev_vdbg(rdev_get_dev(rdev), "regulator-%s-disable\n",
  53                 info->desc.name);
  54
  55         if (info->is_enabled) {
  56                 info->is_enabled = false;
  57                 if (!info->exclude_from_power_state)
  58                         ret = power_state_active_disable();
  59         }
  60
  61         return ret;
  62 }
  63
  64 static int db8500_regulator_is_enabled(struct regulator_dev *rdev)
  65 {
  66         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
  67
  68         if (info == NULL)
  69                 return -EINVAL;
  70
  71         dev_vdbg(rdev_get_dev(rdev), "regulator-%s-is_enabled (is_enabled):"
  72                 " %i\n", info->desc.name, info->is_enabled);
  73
  74         return info->is_enabled;
  75 }
  76
  77 /* db8500 regulator operations */
  78 static struct regulator_ops db8500_regulator_ops = {
  79         .enable                 = db8500_regulator_enable,
  80         .disable                = db8500_regulator_disable,
  81         .is_enabled             = db8500_regulator_is_enabled,
  82 };
  83
  84 /*
  85  * EPOD control
  86  */
  87 static bool epod_on[NUM_EPOD_ID];
  88 static bool epod_ramret[NUM_EPOD_ID];
  89
  90 static int enable_epod(u16 epod_id, bool ramret)
  91 {
  92         int ret;
  93
  94         if (ramret) {
  95                 if (!epod_on[epod_id]) {
  96                         ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
  97                         if (ret < 0)
  98                                 return ret;
  99                 }
 100                 epod_ramret[epod_id] = true;
 101         } else {
 102                 ret = prcmu_set_epod(epod_id, EPOD_STATE_ON);
 103                 if (ret < 0)
 104                         return ret;
 105                 epod_on[epod_id] = true;
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int disable_epod(u16 epod_id, bool ramret)
 112 {
 113         int ret;
 114
 115         if (ramret) {
 116                 if (!epod_on[epod_id]) {
 117                         ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
 118                         if (ret < 0)
 119                                 return ret;
 120                 }
 121                 epod_ramret[epod_id] = false;
 122         } else {
 123                 if (epod_ramret[epod_id]) {
 124                         ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
 125                         if (ret < 0)
 126                                 return ret;
 127                 } else {
 128                         ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
 129                         if (ret < 0)
 130                                 return ret;
 131                 }
 132                 epod_on[epod_id] = false;
 133         }
 134
 135         return 0;
 136 }
 137
 138 /*
 139  * Regulator switch
 140  */
 141 static int db8500_regulator_switch_enable(struct regulator_dev *rdev)
 142 {
 143         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
 144         int ret;
 145
 146         if (info == NULL)
 147                 return -EINVAL;
 148
 149         dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-enable\n",
 150                 info->desc.name);
 151
 152         ret = enable_epod(info->epod_id, info->is_ramret);
 153         if (ret < 0) {
 154                 dev_err(rdev_get_dev(rdev),
 155                         "regulator-switch-%s-enable: prcmu call failed\n",
 156                         info->desc.name);
 157                 goto out;
 158         }
 159
 160         info->is_enabled = true;
 161 out:
 162         return ret;
 163 }
 164
 165 static int db8500_regulator_switch_disable(struct regulator_dev *rdev)
 166 {
 167         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
 168         int ret;
 169
 170         if (info == NULL)
 171                 return -EINVAL;
 172
 173         dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-disable\n",
 174                 info->desc.name);
 175
 176         ret = disable_epod(info->epod_id, info->is_ramret);
 177         if (ret < 0) {
 178                 dev_err(rdev_get_dev(rdev),
 179                         "regulator_switch-%s-disable: prcmu call failed\n",
 180                         info->desc.name);
 181                 goto out;
 182         }
 183
 184         info->is_enabled = 0;
 185 out:
 186         return ret;
 187 }
 188
 189 static int db8500_regulator_switch_is_enabled(struct regulator_dev *rdev)
 190 {
 191         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
 192
 193         if (info == NULL)
 194                 return -EINVAL;
 195
 196         dev_vdbg(rdev_get_dev(rdev),
 197                 "regulator-switch-%s-is_enabled (is_enabled): %i\n",
 198                 info->desc.name, info->is_enabled);
 199
 200         return info->is_enabled;
 201 }
 202
 203 static struct regulator_ops db8500_regulator_switch_ops = {
 204         .enable                 = db8500_regulator_switch_enable,
 205         .disable                = db8500_regulator_switch_disable,
 206         .is_enabled             = db8500_regulator_switch_is_enabled,
 207 };
 208
 209 /*
 210  * Regulator information
 211  */
 212 static struct dbx500_regulator_info
 213 dbx500_regulator_info[DB8500_NUM_REGULATORS] = {
 214         [DB8500_REGULATOR_VAPE] = {
 215                 .desc = {
 216                         .name   = "db8500-vape",
 217                         .id     = DB8500_REGULATOR_VAPE,
 218                         .ops    = &db8500_regulator_ops,
 219                         .type   = REGULATOR_VOLTAGE,
 220                         .owner  = THIS_MODULE,
 221                 },
 222         },
 223         [DB8500_REGULATOR_VARM] = {
 224                 .desc = {
 225                         .name   = "db8500-varm",
 226                         .id     = DB8500_REGULATOR_VARM,
 227                         .ops    = &db8500_regulator_ops,
 228                         .type   = REGULATOR_VOLTAGE,
 229                         .owner  = THIS_MODULE,
 230                 },
 231         },
 232         [DB8500_REGULATOR_VMODEM] = {
 233                 .desc = {
 234                         .name   = "db8500-vmodem",
 235                         .id     = DB8500_REGULATOR_VMODEM,
 236                         .ops    = &db8500_regulator_ops,
 237                         .type   = REGULATOR_VOLTAGE,
 238                         .owner  = THIS_MODULE,
 239                 },
 240         },
 241         [DB8500_REGULATOR_VPLL] = {
 242                 .desc = {
 243                         .name   = "db8500-vpll",
 244                         .id     = DB8500_REGULATOR_VPLL,
 245                         .ops    = &db8500_regulator_ops,
 246                         .type   = REGULATOR_VOLTAGE,
 247                         .owner  = THIS_MODULE,
 248                 },
 249         },
 250         [DB8500_REGULATOR_VSMPS1] = {
 251                 .desc = {
 252                         .name   = "db8500-vsmps1",
 253                         .id     = DB8500_REGULATOR_VSMPS1,
 254                         .ops    = &db8500_regulator_ops,
 255                         .type   = REGULATOR_VOLTAGE,
 256                         .owner  = THIS_MODULE,
 257                 },
 258         },
 259         [DB8500_REGULATOR_VSMPS2] = {
 260                 .desc = {
 261                         .name   = "db8500-vsmps2",
 262                         .id     = DB8500_REGULATOR_VSMPS2,
 263                         .ops    = &db8500_regulator_ops,
 264                         .type   = REGULATOR_VOLTAGE,
 265                         .owner  = THIS_MODULE,
 266                 },
 267                 .exclude_from_power_state = true,
 268         },
 269         [DB8500_REGULATOR_VSMPS3] = {
 270                 .desc = {
 271                         .name   = "db8500-vsmps3",
 272                         .id     = DB8500_REGULATOR_VSMPS3,
 273                         .ops    = &db8500_regulator_ops,
 274                         .type   = REGULATOR_VOLTAGE,
 275                         .owner  = THIS_MODULE,
 276                 },
 277         },
 278         [DB8500_REGULATOR_VRF1] = {
 279                 .desc = {
 280                         .name   = "db8500-vrf1",
 281                         .id     = DB8500_REGULATOR_VRF1,
 282                         .ops    = &db8500_regulator_ops,
 283                         .type   = REGULATOR_VOLTAGE,
 284                         .owner  = THIS_MODULE,
 285                 },
 286         },
 287         [DB8500_REGULATOR_SWITCH_SVAMMDSP] = {
 288                 .desc = {
 289                         .name   = "db8500-sva-mmdsp",
 290                         .id     = DB8500_REGULATOR_SWITCH_SVAMMDSP,
 291                         .ops    = &db8500_regulator_switch_ops,
 292                         .type   = REGULATOR_VOLTAGE,
 293                         .owner  = THIS_MODULE,
 294                 },
 295                 .epod_id = EPOD_ID_SVAMMDSP,
 296         },
 297         [DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = {
 298                 .desc = {
 299                         .name   = "db8500-sva-mmdsp-ret",
 300                         .id     = DB8500_REGULATOR_SWITCH_SVAMMDSPRET,
 301                         .ops    = &db8500_regulator_switch_ops,
 302                         .type   = REGULATOR_VOLTAGE,
 303                         .owner  = THIS_MODULE,
 304                 },
 305                 .epod_id = EPOD_ID_SVAMMDSP,
 306                 .is_ramret = true,
 307         },
 308         [DB8500_REGULATOR_SWITCH_SVAPIPE] = {
 309                 .desc = {
 310                         .name   = "db8500-sva-pipe",
 311                         .id     = DB8500_REGULATOR_SWITCH_SVAPIPE,
 312                         .ops    = &db8500_regulator_switch_ops,
 313                         .type   = REGULATOR_VOLTAGE,
 314                         .owner  = THIS_MODULE,
 315                 },
 316                 .epod_id = EPOD_ID_SVAPIPE,
 317         },
 318         [DB8500_REGULATOR_SWITCH_SIAMMDSP] = {
 319                 .desc = {
 320                         .name   = "db8500-sia-mmdsp",
 321                         .id     = DB8500_REGULATOR_SWITCH_SIAMMDSP,
 322                         .ops    = &db8500_regulator_switch_ops,
 323                         .type   = REGULATOR_VOLTAGE,
 324                         .owner  = THIS_MODULE,
 325                 },
 326                 .epod_id = EPOD_ID_SIAMMDSP,
 327         },
 328         [DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = {
 329                 .desc = {
 330                         .name   = "db8500-sia-mmdsp-ret",
 331                         .id     = DB8500_REGULATOR_SWITCH_SIAMMDSPRET,
 332                         .ops    = &db8500_regulator_switch_ops,
 333                         .type   = REGULATOR_VOLTAGE,
 334                         .owner  = THIS_MODULE,
 335                 },
 336                 .epod_id = EPOD_ID_SIAMMDSP,
 337                 .is_ramret = true,
 338         },
 339         [DB8500_REGULATOR_SWITCH_SIAPIPE] = {
 340                 .desc = {
 341                         .name   = "db8500-sia-pipe",
 342                         .id     = DB8500_REGULATOR_SWITCH_SIAPIPE,
 343                         .ops    = &db8500_regulator_switch_ops,
 344                         .type   = REGULATOR_VOLTAGE,
 345                         .owner  = THIS_MODULE,
 346                 },
 347                 .epod_id = EPOD_ID_SIAPIPE,
 348         },
 349         [DB8500_REGULATOR_SWITCH_SGA] = {
 350                 .desc = {
 351                         .name   = "db8500-sga",
 352                         .id     = DB8500_REGULATOR_SWITCH_SGA,
 353                         .ops    = &db8500_regulator_switch_ops,
 354                         .type   = REGULATOR_VOLTAGE,
 355                         .owner  = THIS_MODULE,
 356                 },
 357                 .epod_id = EPOD_ID_SGA,
 358         },
 359         [DB8500_REGULATOR_SWITCH_B2R2_MCDE] = {
 360                 .desc = {
 361                         .name   = "db8500-b2r2-mcde",
 362                         .id     = DB8500_REGULATOR_SWITCH_B2R2_MCDE,
 363                         .ops    = &db8500_regulator_switch_ops,
 364                         .type   = REGULATOR_VOLTAGE,
 365                         .owner  = THIS_MODULE,
 366                 },
 367                 .epod_id = EPOD_ID_B2R2_MCDE,
 368         },
 369         [DB8500_REGULATOR_SWITCH_ESRAM12] = {
 370                 .desc = {
 371                         .name   = "db8500-esram12",
 372                         .id     = DB8500_REGULATOR_SWITCH_ESRAM12,
 373                         .ops    = &db8500_regulator_switch_ops,
 374                         .type   = REGULATOR_VOLTAGE,
 375                         .owner  = THIS_MODULE,
 376                 },
 377                 .epod_id        = EPOD_ID_ESRAM12,
 378                 .is_enabled     = true,
 379         },
 380         [DB8500_REGULATOR_SWITCH_ESRAM12RET] = {
 381                 .desc = {
 382                         .name   = "db8500-esram12-ret",
 383                         .id     = DB8500_REGULATOR_SWITCH_ESRAM12RET,
 384                         .ops    = &db8500_regulator_switch_ops,
 385                         .type   = REGULATOR_VOLTAGE,
 386                         .owner  = THIS_MODULE,
 387                 },
 388                 .epod_id = EPOD_ID_ESRAM12,
 389                 .is_ramret = true,
 390         },
 391         [DB8500_REGULATOR_SWITCH_ESRAM34] = {
 392                 .desc = {
 393                         .name   = "db8500-esram34",
 394                         .id     = DB8500_REGULATOR_SWITCH_ESRAM34,
 395                         .ops    = &db8500_regulator_switch_ops,
 396                         .type   = REGULATOR_VOLTAGE,
 397                         .owner  = THIS_MODULE,
 398                 },
 399                 .epod_id        = EPOD_ID_ESRAM34,
 400                 .is_enabled     = true,
 401         },
 402         [DB8500_REGULATOR_SWITCH_ESRAM34RET] = {
 403                 .desc = {
 404                         .name   = "db8500-esram34-ret",
 405                         .id     = DB8500_REGULATOR_SWITCH_ESRAM34RET,
 406                         .ops    = &db8500_regulator_switch_ops,
 407                         .type   = REGULATOR_VOLTAGE,
 408                         .owner  = THIS_MODULE,
 409                 },
 410                 .epod_id = EPOD_ID_ESRAM34,
 411                 .is_ramret = true,
 412         },
 413 };
 414
 415 static int db8500_regulator_register(struct platform_device *pdev,
 416                                         struct regulator_init_data *init_data,
 417                                         int id,
 418                                         struct device_node *np)
 419 {
 420         struct dbx500_regulator_info *info;
 421         struct regulator_config config = { };
 422         int err;
 423
 424         /* assign per-regulator data */
 425         info = &dbx500_regulator_info[id];
 426         info->dev = &pdev->dev;
 427
 428         config.dev = &pdev->dev;
 429         config.init_data = init_data;
 430         config.driver_data = info;
 431         config.of_node = np;
 432
 433         /* register with the regulator framework */
 434         info->rdev = regulator_register(&info->desc, &config);
 435         if (IS_ERR(info->rdev)) {
 436                 err = PTR_ERR(info->rdev);
 437                 dev_err(&pdev->dev, "failed to register %s: err %i\n",
 438                         info->desc.name, err);
 439
 440                 /* if failing, unregister all earlier regulators */
 441                 while (--id >= 0) {
 442                         info = &dbx500_regulator_info[id];
 443                         regulator_unregister(info->rdev);
 444                 }
 445                 return err;
 446         }
 447
 448         dev_dbg(rdev_get_dev(info->rdev),
 449                 "regulator-%s-probed\n", info->desc.name);
 450
 451         return 0;
 452 }
 453
 454 static struct of_regulator_match db8500_regulator_matches[] = {
 455         { .name = "db8500_vape",          .driver_data = (void *) DB8500_REGULATOR_VAPE, },
 456         { .name = "db8500_varm",          .driver_data = (void *) DB8500_REGULATOR_VARM, },
 457         { .name = "db8500_vmodem",        .driver_data = (void *) DB8500_REGULATOR_VMODEM, },
 458         { .name = "db8500_vpll",          .driver_data = (void *) DB8500_REGULATOR_VPLL, },
 459         { .name = "db8500_vsmps1",        .driver_data = (void *) DB8500_REGULATOR_VSMPS1, },
 460         { .name = "db8500_vsmps2",        .driver_data = (void *) DB8500_REGULATOR_VSMPS2, },
 461         { .name = "db8500_vsmps3",        .driver_data = (void *) DB8500_REGULATOR_VSMPS3, },
 462         { .name = "db8500_vrf1",          .driver_data = (void *) DB8500_REGULATOR_VRF1, },
 463         { .name = "db8500_sva_mmdsp",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAMMDSP, },
 464         { .name = "db8500_sva_mmdsp_ret", .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAMMDSPRET, },
 465         { .name = "db8500_sva_pipe",      .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAPIPE, },
 466         { .name = "db8500_sia_mmdsp",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAMMDSP, },
 467         { .name = "db8500_sia_mmdsp_ret", .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAMMDSPRET, },
 468         { .name = "db8500_sia_pipe",      .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAPIPE, },
 469         { .name = "db8500_sga",           .driver_data = (void *) DB8500_REGULATOR_SWITCH_SGA, },
 470         { .name = "db8500_b2r2_mcde",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_B2R2_MCDE, },
 471         { .name = "db8500_esram12",       .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM12, },
 472         { .name = "db8500_esram12_ret",   .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM12RET, },
 473         { .name = "db8500_esram34",       .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM34, },
 474         { .name = "db8500_esram34_ret",   .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM34RET, },
 475 };
 476
 477 static int
 478 db8500_regulator_of_probe(struct platform_device *pdev,
 479                         struct device_node *np)
 480 {
 481         int i, err;
 482
 483         for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
 484                 err = db8500_regulator_register(
 485                         pdev, db8500_regulator_matches[i].init_data,
 486                         i, db8500_regulator_matches[i].of_node);
 487                 if (err)
 488                         return err;
 489         }
 490
 491         return 0;
 492 }
 493
 494 static int db8500_regulator_probe(struct platform_device *pdev)
 495 {
 496         struct regulator_init_data *db8500_init_data =
 497                                         dev_get_platdata(&pdev->dev);
 498         struct device_node *np = pdev->dev.of_node;
 499         int i, err;
 500
 501         /* register all regulators */
 502         if (np) {
 503                 err = of_regulator_match(&pdev->dev, np,
 504                                         db8500_regulator_matches,
 505                                         ARRAY_SIZE(db8500_regulator_matches));
 506                 if (err < 0) {
 507                         dev_err(&pdev->dev,
 508                                 "Error parsing regulator init data: %d\n", err);
 509                         return err;
 510                 }
 511
 512                 err = db8500_regulator_of_probe(pdev, np);
 513                 if (err)
 514                         return err;
 515         } else {
 516                 for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
 517                         err = db8500_regulator_register(pdev,
 518                                                         &db8500_init_data[i],
 519                                                         i, NULL);
 520                         if (err)
 521                                 return err;
 522                 }
 523         }
 524
 525         err = ux500_regulator_debug_init(pdev,
 526                                          dbx500_regulator_info,
 527                                          ARRAY_SIZE(dbx500_regulator_info));
 528         return 0;
 529 }
 530
 531 static int db8500_regulator_remove(struct platform_device *pdev)
 532 {
 533         int i;
 534
 535         ux500_regulator_debug_exit();
 536
 537         for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
 538                 struct dbx500_regulator_info *info;
 539                 info = &dbx500_regulator_info[i];
 540
 541                 dev_vdbg(rdev_get_dev(info->rdev),
 542                         "regulator-%s-remove\n", info->desc.name);
 543
 544                 regulator_unregister(info->rdev);
 545         }
 546
 547         return 0;
 548 }
 549
 550 static struct platform_driver db8500_regulator_driver = {
 551         .driver = {
 552                 .name = "db8500-prcmu-regulators",
 553                 .owner = THIS_MODULE,
 554         },
 555         .probe = db8500_regulator_probe,
 556         .remove = db8500_regulator_remove,
 557 };
 558
 559 static int __init db8500_regulator_init(void)
 560 {
 561         return platform_driver_register(&db8500_regulator_driver);
 562 }
 563
 564 static void __exit db8500_regulator_exit(void)
 565 {
 566         platform_driver_unregister(&db8500_regulator_driver);
 567 }
 568
 569 arch_initcall(db8500_regulator_init);
 570 module_exit(db8500_regulator_exit);
 571
 572 MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
 573 MODULE_DESCRIPTION("DB8500 regulator driver");
 574 MODULE_LICENSE("GPL v2");