drivers/regulator/db8500-prcmu.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) ST-Ericsson SA 2010
   4  *
   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 const 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 = false;
 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 const 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                         .of_match = of_match_ptr("db8500_vape"),
 218                         .id     = DB8500_REGULATOR_VAPE,
 219                         .ops    = &db8500_regulator_ops,
 220                         .type   = REGULATOR_VOLTAGE,
 221                         .owner  = THIS_MODULE,
 222                 },
 223         },
 224         [DB8500_REGULATOR_VARM] = {
 225                 .desc = {
 226                         .name   = "db8500-varm",
 227                         .of_match = of_match_ptr("db8500_varm"),
 228                         .id     = DB8500_REGULATOR_VARM,
 229                         .ops    = &db8500_regulator_ops,
 230                         .type   = REGULATOR_VOLTAGE,
 231                         .owner  = THIS_MODULE,
 232                 },
 233         },
 234         [DB8500_REGULATOR_VMODEM] = {
 235                 .desc = {
 236                         .name   = "db8500-vmodem",
 237                         .of_match = of_match_ptr("db8500_vmodem"),
 238                         .id     = DB8500_REGULATOR_VMODEM,
 239                         .ops    = &db8500_regulator_ops,
 240                         .type   = REGULATOR_VOLTAGE,
 241                         .owner  = THIS_MODULE,
 242                 },
 243         },
 244         [DB8500_REGULATOR_VPLL] = {
 245                 .desc = {
 246                         .name   = "db8500-vpll",
 247                         .of_match = of_match_ptr("db8500_vpll"),
 248                         .id     = DB8500_REGULATOR_VPLL,
 249                         .ops    = &db8500_regulator_ops,
 250                         .type   = REGULATOR_VOLTAGE,
 251                         .owner  = THIS_MODULE,
 252                 },
 253         },
 254         [DB8500_REGULATOR_VSMPS1] = {
 255                 .desc = {
 256                         .name   = "db8500-vsmps1",
 257                         .of_match = of_match_ptr("db8500_vsmps1"),
 258                         .id     = DB8500_REGULATOR_VSMPS1,
 259                         .ops    = &db8500_regulator_ops,
 260                         .type   = REGULATOR_VOLTAGE,
 261                         .owner  = THIS_MODULE,
 262                 },
 263         },
 264         [DB8500_REGULATOR_VSMPS2] = {
 265                 .desc = {
 266                         .name   = "db8500-vsmps2",
 267                         .of_match = of_match_ptr("db8500_vsmps2"),
 268                         .id     = DB8500_REGULATOR_VSMPS2,
 269                         .ops    = &db8500_regulator_ops,
 270                         .type   = REGULATOR_VOLTAGE,
 271                         .owner  = THIS_MODULE,
 272                         .fixed_uV = 1800000,
 273                         .n_voltages = 1,
 274                 },
 275                 .exclude_from_power_state = true,
 276         },
 277         [DB8500_REGULATOR_VSMPS3] = {
 278                 .desc = {
 279                         .name   = "db8500-vsmps3",
 280                         .of_match = of_match_ptr("db8500_vsmps3"),
 281                         .id     = DB8500_REGULATOR_VSMPS3,
 282                         .ops    = &db8500_regulator_ops,
 283                         .type   = REGULATOR_VOLTAGE,
 284                         .owner  = THIS_MODULE,
 285                 },
 286         },
 287         [DB8500_REGULATOR_VRF1] = {
 288                 .desc = {
 289                         .name   = "db8500-vrf1",
 290                         .of_match = of_match_ptr("db8500_vrf1"),
 291                         .id     = DB8500_REGULATOR_VRF1,
 292                         .ops    = &db8500_regulator_ops,
 293                         .type   = REGULATOR_VOLTAGE,
 294                         .owner  = THIS_MODULE,
 295                 },
 296         },
 297         [DB8500_REGULATOR_SWITCH_SVAMMDSP] = {
 298                 .desc = {
 299                         .name   = "db8500-sva-mmdsp",
 300                         .of_match = of_match_ptr("db8500_sva_mmdsp"),
 301                         .id     = DB8500_REGULATOR_SWITCH_SVAMMDSP,
 302                         .ops    = &db8500_regulator_switch_ops,
 303                         .type   = REGULATOR_VOLTAGE,
 304                         .owner  = THIS_MODULE,
 305                 },
 306                 .epod_id = EPOD_ID_SVAMMDSP,
 307         },
 308         [DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = {
 309                 .desc = {
 310                         .name   = "db8500-sva-mmdsp-ret",
 311                         .of_match = of_match_ptr("db8500_sva_mmdsp_ret"),
 312                         .id     = DB8500_REGULATOR_SWITCH_SVAMMDSPRET,
 313                         .ops    = &db8500_regulator_switch_ops,
 314                         .type   = REGULATOR_VOLTAGE,
 315                         .owner  = THIS_MODULE,
 316                 },
 317                 .epod_id = EPOD_ID_SVAMMDSP,
 318                 .is_ramret = true,
 319         },
 320         [DB8500_REGULATOR_SWITCH_SVAPIPE] = {
 321                 .desc = {
 322                         .name   = "db8500-sva-pipe",
 323                         .of_match = of_match_ptr("db8500_sva_pipe"),
 324                         .id     = DB8500_REGULATOR_SWITCH_SVAPIPE,
 325                         .ops    = &db8500_regulator_switch_ops,
 326                         .type   = REGULATOR_VOLTAGE,
 327                         .owner  = THIS_MODULE,
 328                 },
 329                 .epod_id = EPOD_ID_SVAPIPE,
 330         },
 331         [DB8500_REGULATOR_SWITCH_SIAMMDSP] = {
 332                 .desc = {
 333                         .name   = "db8500-sia-mmdsp",
 334                         .of_match = of_match_ptr("db8500_sia_mmdsp"),
 335                         .id     = DB8500_REGULATOR_SWITCH_SIAMMDSP,
 336                         .ops    = &db8500_regulator_switch_ops,
 337                         .type   = REGULATOR_VOLTAGE,
 338                         .owner  = THIS_MODULE,
 339                 },
 340                 .epod_id = EPOD_ID_SIAMMDSP,
 341         },
 342         [DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = {
 343                 .desc = {
 344                         .name   = "db8500-sia-mmdsp-ret",
 345                         .of_match = of_match_ptr("db8500_sia_mmdsp_ret"),
 346                         .id     = DB8500_REGULATOR_SWITCH_SIAMMDSPRET,
 347                         .ops    = &db8500_regulator_switch_ops,
 348                         .type   = REGULATOR_VOLTAGE,
 349                         .owner  = THIS_MODULE,
 350                 },
 351                 .epod_id = EPOD_ID_SIAMMDSP,
 352                 .is_ramret = true,
 353         },
 354         [DB8500_REGULATOR_SWITCH_SIAPIPE] = {
 355                 .desc = {
 356                         .name   = "db8500-sia-pipe",
 357                         .of_match = of_match_ptr("db8500_sia_pipe"),
 358                         .id     = DB8500_REGULATOR_SWITCH_SIAPIPE,
 359                         .ops    = &db8500_regulator_switch_ops,
 360                         .type   = REGULATOR_VOLTAGE,
 361                         .owner  = THIS_MODULE,
 362                 },
 363                 .epod_id = EPOD_ID_SIAPIPE,
 364         },
 365         [DB8500_REGULATOR_SWITCH_SGA] = {
 366                 .desc = {
 367                         .name   = "db8500-sga",
 368                         .of_match = of_match_ptr("db8500_sga"),
 369                         .id     = DB8500_REGULATOR_SWITCH_SGA,
 370                         .ops    = &db8500_regulator_switch_ops,
 371                         .type   = REGULATOR_VOLTAGE,
 372                         .owner  = THIS_MODULE,
 373                 },
 374                 .epod_id = EPOD_ID_SGA,
 375         },
 376         [DB8500_REGULATOR_SWITCH_B2R2_MCDE] = {
 377                 .desc = {
 378                         .name   = "db8500-b2r2-mcde",
 379                         .of_match = of_match_ptr("db8500_b2r2_mcde"),
 380                         .id     = DB8500_REGULATOR_SWITCH_B2R2_MCDE,
 381                         .ops    = &db8500_regulator_switch_ops,
 382                         .type   = REGULATOR_VOLTAGE,
 383                         .owner  = THIS_MODULE,
 384                 },
 385                 .epod_id = EPOD_ID_B2R2_MCDE,
 386         },
 387         [DB8500_REGULATOR_SWITCH_ESRAM12] = {
 388                 .desc = {
 389                         .name   = "db8500-esram12",
 390                         .of_match = of_match_ptr("db8500_esram12"),
 391                         .id     = DB8500_REGULATOR_SWITCH_ESRAM12,
 392                         .ops    = &db8500_regulator_switch_ops,
 393                         .type   = REGULATOR_VOLTAGE,
 394                         .owner  = THIS_MODULE,
 395                 },
 396                 .epod_id        = EPOD_ID_ESRAM12,
 397                 .is_enabled     = true,
 398         },
 399         [DB8500_REGULATOR_SWITCH_ESRAM12RET] = {
 400                 .desc = {
 401                         .name   = "db8500-esram12-ret",
 402                         .of_match = of_match_ptr("db8500_esram12_ret"),
 403                         .id     = DB8500_REGULATOR_SWITCH_ESRAM12RET,
 404                         .ops    = &db8500_regulator_switch_ops,
 405                         .type   = REGULATOR_VOLTAGE,
 406                         .owner  = THIS_MODULE,
 407                 },
 408                 .epod_id = EPOD_ID_ESRAM12,
 409                 .is_ramret = true,
 410         },
 411         [DB8500_REGULATOR_SWITCH_ESRAM34] = {
 412                 .desc = {
 413                         .name   = "db8500-esram34",
 414                         .of_match = of_match_ptr("db8500_esram34"),
 415                         .id     = DB8500_REGULATOR_SWITCH_ESRAM34,
 416                         .ops    = &db8500_regulator_switch_ops,
 417                         .type   = REGULATOR_VOLTAGE,
 418                         .owner  = THIS_MODULE,
 419                 },
 420                 .epod_id        = EPOD_ID_ESRAM34,
 421                 .is_enabled     = true,
 422         },
 423         [DB8500_REGULATOR_SWITCH_ESRAM34RET] = {
 424                 .desc = {
 425                         .name   = "db8500-esram34-ret",
 426                         .of_match = of_match_ptr("db8500_esram34_ret"),
 427                         .id     = DB8500_REGULATOR_SWITCH_ESRAM34RET,
 428                         .ops    = &db8500_regulator_switch_ops,
 429                         .type   = REGULATOR_VOLTAGE,
 430                         .owner  = THIS_MODULE,
 431                 },
 432                 .epod_id = EPOD_ID_ESRAM34,
 433                 .is_ramret = true,
 434         },
 435 };
 436
 437 static int db8500_regulator_probe(struct platform_device *pdev)
 438 {
 439         struct regulator_init_data *db8500_init_data;
 440         struct dbx500_regulator_info *info;
 441         struct regulator_config config = { };
 442         struct regulator_dev *rdev;
 443         int err, i;
 444
 445         db8500_init_data = dev_get_platdata(&pdev->dev);
 446
 447         for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
 448                 /* assign per-regulator data */
 449                 info = &dbx500_regulator_info[i];
 450
 451                 config.driver_data = info;
 452                 config.dev = &pdev->dev;
 453                 if (db8500_init_data)
 454                         config.init_data = &db8500_init_data[i];
 455
 456                 rdev = devm_regulator_register(&pdev->dev, &info->desc,
 457                                                &config);
 458                 if (IS_ERR(rdev)) {
 459                         err = PTR_ERR(rdev);
 460                         dev_err(&pdev->dev, "failed to register %s: err %i\n",
 461                                 info->desc.name, err);
 462                         return err;
 463                 }
 464                 dev_dbg(&pdev->dev, "regulator-%s-probed\n", info->desc.name);
 465         }
 466
 467         ux500_regulator_debug_init(pdev, dbx500_regulator_info,
 468                                    ARRAY_SIZE(dbx500_regulator_info));
 469         return 0;
 470 }
 471
 472 static int db8500_regulator_remove(struct platform_device *pdev)
 473 {
 474         ux500_regulator_debug_exit();
 475
 476         return 0;
 477 }
 478
 479 static struct platform_driver db8500_regulator_driver = {
 480         .driver = {
 481                 .name = "db8500-prcmu-regulators",
 482                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 483         },
 484         .probe = db8500_regulator_probe,
 485         .remove = db8500_regulator_remove,
 486 };
 487
 488 static int __init db8500_regulator_init(void)
 489 {
 490         return platform_driver_register(&db8500_regulator_driver);
 491 }
 492
 493 static void __exit db8500_regulator_exit(void)
 494 {
 495         platform_driver_unregister(&db8500_regulator_driver);
 496 }
 497
 498 arch_initcall(db8500_regulator_init);
 499 module_exit(db8500_regulator_exit);
 500
 501 MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
 502 MODULE_DESCRIPTION("DB8500 regulator driver");
 503 MODULE_LICENSE("GPL v2");