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                         .fixed_uV = 1800000,
 267                         .n_voltages = 1,
 268                 },
 269                 .exclude_from_power_state = true,
 270         },
 271         [DB8500_REGULATOR_VSMPS3] = {
 272                 .desc = {
 273                         .name   = "db8500-vsmps3",
 274                         .id     = DB8500_REGULATOR_VSMPS3,
 275                         .ops    = &db8500_regulator_ops,
 276                         .type   = REGULATOR_VOLTAGE,
 277                         .owner  = THIS_MODULE,
 278                 },
 279         },
 280         [DB8500_REGULATOR_VRF1] = {
 281                 .desc = {
 282                         .name   = "db8500-vrf1",
 283                         .id     = DB8500_REGULATOR_VRF1,
 284                         .ops    = &db8500_regulator_ops,
 285                         .type   = REGULATOR_VOLTAGE,
 286                         .owner  = THIS_MODULE,
 287                 },
 288         },
 289         [DB8500_REGULATOR_SWITCH_SVAMMDSP] = {
 290                 .desc = {
 291                         .name   = "db8500-sva-mmdsp",
 292                         .id     = DB8500_REGULATOR_SWITCH_SVAMMDSP,
 293                         .ops    = &db8500_regulator_switch_ops,
 294                         .type   = REGULATOR_VOLTAGE,
 295                         .owner  = THIS_MODULE,
 296                 },
 297                 .epod_id = EPOD_ID_SVAMMDSP,
 298         },
 299         [DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = {
 300                 .desc = {
 301                         .name   = "db8500-sva-mmdsp-ret",
 302                         .id     = DB8500_REGULATOR_SWITCH_SVAMMDSPRET,
 303                         .ops    = &db8500_regulator_switch_ops,
 304                         .type   = REGULATOR_VOLTAGE,
 305                         .owner  = THIS_MODULE,
 306                 },
 307                 .epod_id = EPOD_ID_SVAMMDSP,
 308                 .is_ramret = true,
 309         },
 310         [DB8500_REGULATOR_SWITCH_SVAPIPE] = {
 311                 .desc = {
 312                         .name   = "db8500-sva-pipe",
 313                         .id     = DB8500_REGULATOR_SWITCH_SVAPIPE,
 314                         .ops    = &db8500_regulator_switch_ops,
 315                         .type   = REGULATOR_VOLTAGE,
 316                         .owner  = THIS_MODULE,
 317                 },
 318                 .epod_id = EPOD_ID_SVAPIPE,
 319         },
 320         [DB8500_REGULATOR_SWITCH_SIAMMDSP] = {
 321                 .desc = {
 322                         .name   = "db8500-sia-mmdsp",
 323                         .id     = DB8500_REGULATOR_SWITCH_SIAMMDSP,
 324                         .ops    = &db8500_regulator_switch_ops,
 325                         .type   = REGULATOR_VOLTAGE,
 326                         .owner  = THIS_MODULE,
 327                 },
 328                 .epod_id = EPOD_ID_SIAMMDSP,
 329         },
 330         [DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = {
 331                 .desc = {
 332                         .name   = "db8500-sia-mmdsp-ret",
 333                         .id     = DB8500_REGULATOR_SWITCH_SIAMMDSPRET,
 334                         .ops    = &db8500_regulator_switch_ops,
 335                         .type   = REGULATOR_VOLTAGE,
 336                         .owner  = THIS_MODULE,
 337                 },
 338                 .epod_id = EPOD_ID_SIAMMDSP,
 339                 .is_ramret = true,
 340         },
 341         [DB8500_REGULATOR_SWITCH_SIAPIPE] = {
 342                 .desc = {
 343                         .name   = "db8500-sia-pipe",
 344                         .id     = DB8500_REGULATOR_SWITCH_SIAPIPE,
 345                         .ops    = &db8500_regulator_switch_ops,
 346                         .type   = REGULATOR_VOLTAGE,
 347                         .owner  = THIS_MODULE,
 348                 },
 349                 .epod_id = EPOD_ID_SIAPIPE,
 350         },
 351         [DB8500_REGULATOR_SWITCH_SGA] = {
 352                 .desc = {
 353                         .name   = "db8500-sga",
 354                         .id     = DB8500_REGULATOR_SWITCH_SGA,
 355                         .ops    = &db8500_regulator_switch_ops,
 356                         .type   = REGULATOR_VOLTAGE,
 357                         .owner  = THIS_MODULE,
 358                 },
 359                 .epod_id = EPOD_ID_SGA,
 360         },
 361         [DB8500_REGULATOR_SWITCH_B2R2_MCDE] = {
 362                 .desc = {
 363                         .name   = "db8500-b2r2-mcde",
 364                         .id     = DB8500_REGULATOR_SWITCH_B2R2_MCDE,
 365                         .ops    = &db8500_regulator_switch_ops,
 366                         .type   = REGULATOR_VOLTAGE,
 367                         .owner  = THIS_MODULE,
 368                 },
 369                 .epod_id = EPOD_ID_B2R2_MCDE,
 370         },
 371         [DB8500_REGULATOR_SWITCH_ESRAM12] = {
 372                 .desc = {
 373                         .name   = "db8500-esram12",
 374                         .id     = DB8500_REGULATOR_SWITCH_ESRAM12,
 375                         .ops    = &db8500_regulator_switch_ops,
 376                         .type   = REGULATOR_VOLTAGE,
 377                         .owner  = THIS_MODULE,
 378                 },
 379                 .epod_id        = EPOD_ID_ESRAM12,
 380                 .is_enabled     = true,
 381         },
 382         [DB8500_REGULATOR_SWITCH_ESRAM12RET] = {
 383                 .desc = {
 384                         .name   = "db8500-esram12-ret",
 385                         .id     = DB8500_REGULATOR_SWITCH_ESRAM12RET,
 386                         .ops    = &db8500_regulator_switch_ops,
 387                         .type   = REGULATOR_VOLTAGE,
 388                         .owner  = THIS_MODULE,
 389                 },
 390                 .epod_id = EPOD_ID_ESRAM12,
 391                 .is_ramret = true,
 392         },
 393         [DB8500_REGULATOR_SWITCH_ESRAM34] = {
 394                 .desc = {
 395                         .name   = "db8500-esram34",
 396                         .id     = DB8500_REGULATOR_SWITCH_ESRAM34,
 397                         .ops    = &db8500_regulator_switch_ops,
 398                         .type   = REGULATOR_VOLTAGE,
 399                         .owner  = THIS_MODULE,
 400                 },
 401                 .epod_id        = EPOD_ID_ESRAM34,
 402                 .is_enabled     = true,
 403         },
 404         [DB8500_REGULATOR_SWITCH_ESRAM34RET] = {
 405                 .desc = {
 406                         .name   = "db8500-esram34-ret",
 407                         .id     = DB8500_REGULATOR_SWITCH_ESRAM34RET,
 408                         .ops    = &db8500_regulator_switch_ops,
 409                         .type   = REGULATOR_VOLTAGE,
 410                         .owner  = THIS_MODULE,
 411                 },
 412                 .epod_id = EPOD_ID_ESRAM34,
 413                 .is_ramret = true,
 414         },
 415 };
 416
 417 static int db8500_regulator_register(struct platform_device *pdev,
 418                                         struct regulator_init_data *init_data,
 419                                         int id,
 420                                         struct device_node *np)
 421 {
 422         struct dbx500_regulator_info *info;
 423         struct regulator_config config = { };
 424         int err;
 425
 426         /* assign per-regulator data */
 427         info = &dbx500_regulator_info[id];
 428         info->dev = &pdev->dev;
 429
 430         config.dev = &pdev->dev;
 431         config.init_data = init_data;
 432         config.driver_data = info;
 433         config.of_node = np;
 434
 435         /* register with the regulator framework */
 436         info->rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
 437         if (IS_ERR(info->rdev)) {
 438                 err = PTR_ERR(info->rdev);
 439                 dev_err(&pdev->dev, "failed to register %s: err %i\n",
 440                         info->desc.name, err);
 441                 return err;
 442         }
 443
 444         dev_dbg(rdev_get_dev(info->rdev),
 445                 "regulator-%s-probed\n", info->desc.name);
 446
 447         return 0;
 448 }
 449
 450 static struct of_regulator_match db8500_regulator_matches[] = {
 451         { .name = "db8500_vape",          .driver_data = (void *) DB8500_REGULATOR_VAPE, },
 452         { .name = "db8500_varm",          .driver_data = (void *) DB8500_REGULATOR_VARM, },
 453         { .name = "db8500_vmodem",        .driver_data = (void *) DB8500_REGULATOR_VMODEM, },
 454         { .name = "db8500_vpll",          .driver_data = (void *) DB8500_REGULATOR_VPLL, },
 455         { .name = "db8500_vsmps1",        .driver_data = (void *) DB8500_REGULATOR_VSMPS1, },
 456         { .name = "db8500_vsmps2",        .driver_data = (void *) DB8500_REGULATOR_VSMPS2, },
 457         { .name = "db8500_vsmps3",        .driver_data = (void *) DB8500_REGULATOR_VSMPS3, },
 458         { .name = "db8500_vrf1",          .driver_data = (void *) DB8500_REGULATOR_VRF1, },
 459         { .name = "db8500_sva_mmdsp",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAMMDSP, },
 460         { .name = "db8500_sva_mmdsp_ret", .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAMMDSPRET, },
 461         { .name = "db8500_sva_pipe",      .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAPIPE, },
 462         { .name = "db8500_sia_mmdsp",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAMMDSP, },
 463         { .name = "db8500_sia_mmdsp_ret", .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAMMDSPRET, },
 464         { .name = "db8500_sia_pipe",      .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAPIPE, },
 465         { .name = "db8500_sga",           .driver_data = (void *) DB8500_REGULATOR_SWITCH_SGA, },
 466         { .name = "db8500_b2r2_mcde",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_B2R2_MCDE, },
 467         { .name = "db8500_esram12",       .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM12, },
 468         { .name = "db8500_esram12_ret",   .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM12RET, },
 469         { .name = "db8500_esram34",       .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM34, },
 470         { .name = "db8500_esram34_ret",   .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM34RET, },
 471 };
 472
 473 static int
 474 db8500_regulator_of_probe(struct platform_device *pdev,
 475                         struct device_node *np)
 476 {
 477         int i, err;
 478
 479         for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
 480                 err = db8500_regulator_register(
 481                         pdev, db8500_regulator_matches[i].init_data,
 482                         i, db8500_regulator_matches[i].of_node);
 483                 if (err)
 484                         return err;
 485         }
 486
 487         return 0;
 488 }
 489
 490 static int db8500_regulator_probe(struct platform_device *pdev)
 491 {
 492         struct regulator_init_data *db8500_init_data =
 493                                         dev_get_platdata(&pdev->dev);
 494         struct device_node *np = pdev->dev.of_node;
 495         int i, err;
 496
 497         /* register all regulators */
 498         if (np) {
 499                 err = of_regulator_match(&pdev->dev, np,
 500                                         db8500_regulator_matches,
 501                                         ARRAY_SIZE(db8500_regulator_matches));
 502                 if (err < 0) {
 503                         dev_err(&pdev->dev,
 504                                 "Error parsing regulator init data: %d\n", err);
 505                         return err;
 506                 }
 507
 508                 err = db8500_regulator_of_probe(pdev, np);
 509                 if (err)
 510                         return err;
 511         } else {
 512                 for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
 513                         err = db8500_regulator_register(pdev,
 514                                                         &db8500_init_data[i],
 515                                                         i, NULL);
 516                         if (err)
 517                                 return err;
 518                 }
 519         }
 520
 521         err = ux500_regulator_debug_init(pdev,
 522                                          dbx500_regulator_info,
 523                                          ARRAY_SIZE(dbx500_regulator_info));
 524         return 0;
 525 }
 526
 527 static int db8500_regulator_remove(struct platform_device *pdev)
 528 {
 529         ux500_regulator_debug_exit();
 530
 531         return 0;
 532 }
 533
 534 static struct platform_driver db8500_regulator_driver = {
 535         .driver = {
 536                 .name = "db8500-prcmu-regulators",
 537         },
 538         .probe = db8500_regulator_probe,
 539         .remove = db8500_regulator_remove,
 540 };
 541
 542 static int __init db8500_regulator_init(void)
 543 {
 544         return platform_driver_register(&db8500_regulator_driver);
 545 }
 546
 547 static void __exit db8500_regulator_exit(void)
 548 {
 549         platform_driver_unregister(&db8500_regulator_driver);
 550 }
 551
 552 arch_initcall(db8500_regulator_init);
 553 module_exit(db8500_regulator_exit);
 554
 555 MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
 556 MODULE_DESCRIPTION("DB8500 regulator driver");
 557 MODULE_LICENSE("GPL v2");