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