linux/drivers/regulator/db8500-prcmu.c
<<
>>
Prefs
   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
  25static 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
  44static 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
  64static 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 */
  78static 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 */
  87static bool epod_on[NUM_EPOD_ID];
  88static bool epod_ramret[NUM_EPOD_ID];
  89
  90static 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
 111static 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 */
 141static 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;
 161out:
 162        return ret;
 163}
 164
 165static 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;
 185out:
 186        return ret;
 187}
 188
 189static 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
 203static 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 */
 212static struct dbx500_regulator_info
 213dbx500_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
 415static 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
 454static 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
 477static int
 478db8500_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
 494static 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
 531static int __exit 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
 550static 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 = __exit_p(db8500_regulator_remove),
 557};
 558
 559static int __init db8500_regulator_init(void)
 560{
 561        return platform_driver_register(&db8500_regulator_driver);
 562}
 563
 564static void __exit db8500_regulator_exit(void)
 565{
 566        platform_driver_unregister(&db8500_regulator_driver);
 567}
 568
 569arch_initcall(db8500_regulator_init);
 570module_exit(db8500_regulator_exit);
 571
 572MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
 573MODULE_DESCRIPTION("DB8500 regulator driver");
 574MODULE_LICENSE("GPL v2");
 575
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.