drivers/mmc/core/sdio.c

   1 /*
   2  *  linux/drivers/mmc/sdio.c
   3  *
   4  *  Copyright 2006-2007 Pierre Ossman
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  */
  11
  12 #include <linux/err.h>
  13 #include <linux/pm_runtime.h>
  14
  15 #include <linux/mmc/host.h>
  16 #include <linux/mmc/card.h>
  17 #include <linux/mmc/sdio.h>
  18 #include <linux/mmc/sdio_func.h>
  19
  20 #include "core.h"
  21 #include "bus.h"
  22 #include "sd.h"
  23 #include "sdio_bus.h"
  24 #include "mmc_ops.h"
  25 #include "sd_ops.h"
  26 #include "sdio_ops.h"
  27 #include "sdio_cis.h"
  28
  29 static int sdio_read_fbr(struct sdio_func *func)
  30 {
  31         int ret;
  32         unsigned char data;
  33
  34         ret = mmc_io_rw_direct(func->card, 0, 0,
  35                 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
  36         if (ret)
  37                 goto out;
  38
  39         data &= 0x0f;
  40
  41         if (data == 0x0f) {
  42                 ret = mmc_io_rw_direct(func->card, 0, 0,
  43                         SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
  44                 if (ret)
  45                         goto out;
  46         }
  47
  48         func->class = data;
  49
  50 out:
  51         return ret;
  52 }
  53
  54 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
  55 {
  56         int ret;
  57         struct sdio_func *func;
  58
  59         BUG_ON(fn > SDIO_MAX_FUNCS);
  60
  61         func = sdio_alloc_func(card);
  62         if (IS_ERR(func))
  63                 return PTR_ERR(func);
  64
  65         func->num = fn;
  66
  67         if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
  68                 ret = sdio_read_fbr(func);
  69                 if (ret)
  70                         goto fail;
  71
  72                 ret = sdio_read_func_cis(func);
  73                 if (ret)
  74                         goto fail;
  75         } else {
  76                 func->vendor = func->card->cis.vendor;
  77                 func->device = func->card->cis.device;
  78                 func->max_blksize = func->card->cis.blksize;
  79         }
  80
  81         card->sdio_func[fn - 1] = func;
  82
  83         return 0;
  84
  85 fail:
  86         /*
  87          * It is okay to remove the function here even though we hold
  88          * the host lock as we haven't registered the device yet.
  89          */
  90         sdio_remove_func(func);
  91         return ret;
  92 }
  93
  94 static int sdio_read_cccr(struct mmc_card *card)
  95 {
  96         int ret;
  97         int cccr_vsn;
  98         unsigned char data;
  99
 100         memset(&card->cccr, 0, sizeof(struct sdio_cccr));
 101
 102         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
 103         if (ret)
 104                 goto out;
 105
 106         cccr_vsn = data & 0x0f;
 107
 108         if (cccr_vsn > SDIO_CCCR_REV_1_20) {
 109                 printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
 110                         mmc_hostname(card->host), cccr_vsn);
 111                 return -EINVAL;
 112         }
 113
 114         card->cccr.sdio_vsn = (data & 0xf0) >> 4;
 115
 116         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
 117         if (ret)
 118                 goto out;
 119
 120         if (data & SDIO_CCCR_CAP_SMB)
 121                 card->cccr.multi_block = 1;
 122         if (data & SDIO_CCCR_CAP_LSC)
 123                 card->cccr.low_speed = 1;
 124         if (data & SDIO_CCCR_CAP_4BLS)
 125                 card->cccr.wide_bus = 1;
 126
 127         if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
 128                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
 129                 if (ret)
 130                         goto out;
 131
 132                 if (data & SDIO_POWER_SMPC)
 133                         card->cccr.high_power = 1;
 134         }
 135
 136         if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
 137                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
 138                 if (ret)
 139                         goto out;
 140
 141                 if (data & SDIO_SPEED_SHS)
 142                         card->cccr.high_speed = 1;
 143         }
 144
 145 out:
 146         return ret;
 147 }
 148
 149 static int sdio_enable_wide(struct mmc_card *card)
 150 {
 151         int ret;
 152         u8 ctrl;
 153
 154         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 155                 return 0;
 156
 157         if (card->cccr.low_speed && !card->cccr.wide_bus)
 158                 return 0;
 159
 160         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 161         if (ret)
 162                 return ret;
 163
 164         ctrl |= SDIO_BUS_WIDTH_4BIT;
 165
 166         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 167         if (ret)
 168                 return ret;
 169
 170         return 1;
 171 }
 172
 173 /*
 174  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
 175  * of the card. This may be required on certain setups of boards,
 176  * controllers and embedded sdio device which do not need the card's
 177  * pull-up. As a result, card detection is disabled and power is saved.
 178  */
 179 static int sdio_disable_cd(struct mmc_card *card)
 180 {
 181         int ret;
 182         u8 ctrl;
 183
 184         if (!card->cccr.disable_cd)
 185                 return 0;
 186
 187         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 188         if (ret)
 189                 return ret;
 190
 191         ctrl |= SDIO_BUS_CD_DISABLE;
 192
 193         return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 194 }
 195
 196 /*
 197  * Devices that remain active during a system suspend are
 198  * put back into 1-bit mode.
 199  */
 200 static int sdio_disable_wide(struct mmc_card *card)
 201 {
 202         int ret;
 203         u8 ctrl;
 204
 205         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 206                 return 0;
 207
 208         if (card->cccr.low_speed && !card->cccr.wide_bus)
 209                 return 0;
 210
 211         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 212         if (ret)
 213                 return ret;
 214
 215         if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
 216                 return 0;
 217
 218         ctrl &= ~SDIO_BUS_WIDTH_4BIT;
 219         ctrl |= SDIO_BUS_ASYNC_INT;
 220
 221         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 222         if (ret)
 223                 return ret;
 224
 225         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
 226
 227         return 0;
 228 }
 229
 230
 231 static int sdio_enable_4bit_bus(struct mmc_card *card)
 232 {
 233         int err;
 234
 235         if (card->type == MMC_TYPE_SDIO)
 236                 return sdio_enable_wide(card);
 237
 238         if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
 239                 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 240                 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 241                 if (err)
 242                         return err;
 243         } else
 244                 return 0;
 245
 246         err = sdio_enable_wide(card);
 247         if (err <= 0)
 248                 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
 249
 250         return err;
 251 }
 252
 253
 254 /*
 255  * Test if the card supports high-speed mode and, if so, switch to it.
 256  */
 257 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
 258 {
 259         int ret;
 260         u8 speed;
 261
 262         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
 263                 return 0;
 264
 265         if (!card->cccr.high_speed)
 266                 return 0;
 267
 268         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 269         if (ret)
 270                 return ret;
 271
 272         if (enable)
 273                 speed |= SDIO_SPEED_EHS;
 274         else
 275                 speed &= ~SDIO_SPEED_EHS;
 276
 277         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 278         if (ret)
 279                 return ret;
 280
 281         return 1;
 282 }
 283
 284 /*
 285  * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
 286  */
 287 static int sdio_enable_hs(struct mmc_card *card)
 288 {
 289         int ret;
 290
 291         ret = mmc_sdio_switch_hs(card, true);
 292         if (ret <= 0 || card->type == MMC_TYPE_SDIO)
 293                 return ret;
 294
 295         ret = mmc_sd_switch_hs(card);
 296         if (ret <= 0)
 297                 mmc_sdio_switch_hs(card, false);
 298
 299         return ret;
 300 }
 301
 302 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
 303 {
 304         unsigned max_dtr;
 305
 306         if (mmc_card_highspeed(card)) {
 307                 /*
 308                  * The SDIO specification doesn't mention how
 309                  * the CIS transfer speed register relates to
 310                  * high-speed, but it seems that 50 MHz is
 311                  * mandatory.
 312                  */
 313                 max_dtr = 50000000;
 314         } else {
 315                 max_dtr = card->cis.max_dtr;
 316         }
 317
 318         if (card->type == MMC_TYPE_SD_COMBO)
 319                 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
 320
 321         return max_dtr;
 322 }
 323
 324 /*
 325  * Handle the detection and initialisation of a card.
 326  *
 327  * In the case of a resume, "oldcard" will contain the card
 328  * we're trying to reinitialise.
 329  */
 330 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 331                               struct mmc_card *oldcard, int powered_resume)
 332 {
 333         struct mmc_card *card;
 334         int err;
 335
 336         BUG_ON(!host);
 337         WARN_ON(!host->claimed);
 338
 339         /*
 340          * Inform the card of the voltage
 341          */
 342         if (!powered_resume) {
 343                 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
 344                 if (err)
 345                         goto err;
 346         }
 347
 348         /*
 349          * For SPI, enable CRC as appropriate.
 350          */
 351         if (mmc_host_is_spi(host)) {
 352                 err = mmc_spi_set_crc(host, use_spi_crc);
 353                 if (err)
 354                         goto err;
 355         }
 356
 357         /*
 358          * Allocate card structure.
 359          */
 360         card = mmc_alloc_card(host, NULL);
 361         if (IS_ERR(card)) {
 362                 err = PTR_ERR(card);
 363                 goto err;
 364         }
 365
 366         if (ocr & R4_MEMORY_PRESENT
 367             && mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid) == 0) {
 368                 card->type = MMC_TYPE_SD_COMBO;
 369
 370                 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
 371                     memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
 372                         mmc_remove_card(card);
 373                         return -ENOENT;
 374                 }
 375         } else {
 376                 card->type = MMC_TYPE_SDIO;
 377
 378                 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
 379                         mmc_remove_card(card);
 380                         return -ENOENT;
 381                 }
 382         }
 383
 384         /*
 385          * Call the optional HC's init_card function to handle quirks.
 386          */
 387         if (host->ops->init_card)
 388                 host->ops->init_card(host, card);
 389
 390         /*
 391          * For native busses:  set card RCA and quit open drain mode.
 392          */
 393         if (!powered_resume && !mmc_host_is_spi(host)) {
 394                 err = mmc_send_relative_addr(host, &card->rca);
 395                 if (err)
 396                         goto remove;
 397
 398                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 399         }
 400
 401         /*
 402          * Read CSD, before selecting the card
 403          */
 404         if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
 405                 err = mmc_sd_get_csd(host, card);
 406                 if (err)
 407                         return err;
 408
 409                 mmc_decode_cid(card);
 410         }
 411
 412         /*
 413          * Select card, as all following commands rely on that.
 414          */
 415         if (!powered_resume && !mmc_host_is_spi(host)) {
 416                 err = mmc_select_card(card);
 417                 if (err)
 418                         goto remove;
 419         }
 420
 421         if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
 422                 /*
 423                  * This is non-standard SDIO device, meaning it doesn't
 424                  * have any CIA (Common I/O area) registers present.
 425                  * It's host's responsibility to fill cccr and cis
 426                  * structures in init_card().
 427                  */
 428                 mmc_set_clock(host, card->cis.max_dtr);
 429
 430                 if (card->cccr.high_speed) {
 431                         mmc_card_set_highspeed(card);
 432                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 433                 }
 434
 435                 goto finish;
 436         }
 437
 438         /*
 439          * Read the common registers.
 440          */
 441         err = sdio_read_cccr(card);
 442         if (err)
 443                 goto remove;
 444
 445         /*
 446          * Read the common CIS tuples.
 447          */
 448         err = sdio_read_common_cis(card);
 449         if (err)
 450                 goto remove;
 451
 452         if (oldcard) {
 453                 int same = (card->cis.vendor == oldcard->cis.vendor &&
 454                             card->cis.device == oldcard->cis.device);
 455                 mmc_remove_card(card);
 456                 if (!same)
 457                         return -ENOENT;
 458
 459                 card = oldcard;
 460         }
 461
 462         if (card->type == MMC_TYPE_SD_COMBO) {
 463                 err = mmc_sd_setup_card(host, card, oldcard != NULL);
 464                 /* handle as SDIO-only card if memory init failed */
 465                 if (err) {
 466                         mmc_go_idle(host);
 467                         if (mmc_host_is_spi(host))
 468                                 /* should not fail, as it worked previously */
 469                                 mmc_spi_set_crc(host, use_spi_crc);
 470                         card->type = MMC_TYPE_SDIO;
 471                 } else
 472                         card->dev.type = &sd_type;
 473         }
 474
 475         /*
 476          * If needed, disconnect card detection pull-up resistor.
 477          */
 478         err = sdio_disable_cd(card);
 479         if (err)
 480                 goto remove;
 481
 482         /*
 483          * Switch to high-speed (if supported).
 484          */
 485         err = sdio_enable_hs(card);
 486         if (err > 0)
 487                 mmc_sd_go_highspeed(card);
 488         else if (err)
 489                 goto remove;
 490
 491         /*
 492          * Change to the card's maximum speed.
 493          */
 494         mmc_set_clock(host, mmc_sdio_get_max_clock(card));
 495
 496         /*
 497          * Switch to wider bus (if supported).
 498          */
 499         err = sdio_enable_4bit_bus(card);
 500         if (err > 0)
 501                 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 502         else if (err)
 503                 goto remove;
 504
 505 finish:
 506         if (!oldcard)
 507                 host->card = card;
 508         return 0;
 509
 510 remove:
 511         if (!oldcard)
 512                 mmc_remove_card(card);
 513
 514 err:
 515         return err;
 516 }
 517
 518 /*
 519  * Host is being removed. Free up the current card.
 520  */
 521 static void mmc_sdio_remove(struct mmc_host *host)
 522 {
 523         int i;
 524
 525         BUG_ON(!host);
 526         BUG_ON(!host->card);
 527
 528         for (i = 0;i < host->card->sdio_funcs;i++) {
 529                 if (host->card->sdio_func[i]) {
 530                         sdio_remove_func(host->card->sdio_func[i]);
 531                         host->card->sdio_func[i] = NULL;
 532                 }
 533         }
 534
 535         mmc_remove_card(host->card);
 536         host->card = NULL;
 537 }
 538
 539 /*
 540  * Card detection callback from host.
 541  */
 542 static void mmc_sdio_detect(struct mmc_host *host)
 543 {
 544         int err;
 545
 546         BUG_ON(!host);
 547         BUG_ON(!host->card);
 548
 549         /* Make sure card is powered before detecting it */
 550         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 551                 err = pm_runtime_get_sync(&host->card->dev);
 552                 if (err < 0)
 553                         goto out;
 554         }
 555
 556         mmc_claim_host(host);
 557
 558         /*
 559          * Just check if our card has been removed.
 560          */
 561         err = mmc_select_card(host->card);
 562
 563         mmc_release_host(host);
 564
 565         /*
 566          * Tell PM core it's OK to power off the card now.
 567          *
 568          * The _sync variant is used in order to ensure that the card
 569          * is left powered off in case an error occurred, and the card
 570          * is going to be removed.
 571          *
 572          * Since there is no specific reason to believe a new user
 573          * is about to show up at this point, the _sync variant is
 574          * desirable anyway.
 575          */
 576         if (host->caps & MMC_CAP_POWER_OFF_CARD)
 577                 pm_runtime_put_sync(&host->card->dev);
 578
 579 out:
 580         if (err) {
 581                 mmc_sdio_remove(host);
 582
 583                 mmc_claim_host(host);
 584                 mmc_detach_bus(host);
 585                 mmc_release_host(host);
 586         }
 587 }
 588
 589 /*
 590  * SDIO suspend.  We need to suspend all functions separately.
 591  * Therefore all registered functions must have drivers with suspend
 592  * and resume methods.  Failing that we simply remove the whole card.
 593  */
 594 static int mmc_sdio_suspend(struct mmc_host *host)
 595 {
 596         int i, err = 0;
 597
 598         for (i = 0; i < host->card->sdio_funcs; i++) {
 599                 struct sdio_func *func = host->card->sdio_func[i];
 600                 if (func && sdio_func_present(func) && func->dev.driver) {
 601                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 602                         if (!pmops || !pmops->suspend || !pmops->resume) {
 603                                 /* force removal of entire card in that case */
 604                                 err = -ENOSYS;
 605                         } else
 606                                 err = pmops->suspend(&func->dev);
 607                         if (err)
 608                                 break;
 609                 }
 610         }
 611         while (err && --i >= 0) {
 612                 struct sdio_func *func = host->card->sdio_func[i];
 613                 if (func && sdio_func_present(func) && func->dev.driver) {
 614                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 615                         pmops->resume(&func->dev);
 616                 }
 617         }
 618
 619         if (!err && host->pm_flags & MMC_PM_KEEP_POWER) {
 620                 mmc_claim_host(host);
 621                 sdio_disable_wide(host->card);
 622                 mmc_release_host(host);
 623         }
 624
 625         return err;
 626 }
 627
 628 static int mmc_sdio_resume(struct mmc_host *host)
 629 {
 630         int i, err = 0;
 631
 632         BUG_ON(!host);
 633         BUG_ON(!host->card);
 634
 635         /* Basic card reinitialization. */
 636         mmc_claim_host(host);
 637
 638         /* No need to reinitialize powered-resumed nonremovable cards */
 639         if (mmc_card_is_removable(host) || !mmc_card_is_powered_resumed(host))
 640                 err = mmc_sdio_init_card(host, host->ocr, host->card,
 641                                  (host->pm_flags & MMC_PM_KEEP_POWER));
 642         else if (mmc_card_is_powered_resumed(host)) {
 643                 /* We may have switched to 1-bit mode during suspend */
 644                 err = sdio_enable_4bit_bus(host->card);
 645                 if (err > 0) {
 646                         mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
 647                         err = 0;
 648                 }
 649         }
 650
 651         if (!err && host->sdio_irqs)
 652                 mmc_signal_sdio_irq(host);
 653         mmc_release_host(host);
 654
 655         /*
 656          * If the card looked to be the same as before suspending, then
 657          * we proceed to resume all card functions.  If one of them returns
 658          * an error then we simply return that error to the core and the
 659          * card will be redetected as new.  It is the responsibility of
 660          * the function driver to perform further tests with the extra
 661          * knowledge it has of the card to confirm the card is indeed the
 662          * same as before suspending (same MAC address for network cards,
 663          * etc.) and return an error otherwise.
 664          */
 665         for (i = 0; !err && i < host->card->sdio_funcs; i++) {
 666                 struct sdio_func *func = host->card->sdio_func[i];
 667                 if (func && sdio_func_present(func) && func->dev.driver) {
 668                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 669                         err = pmops->resume(&func->dev);
 670                 }
 671         }
 672
 673         return err;
 674 }
 675
 676 static int mmc_sdio_power_restore(struct mmc_host *host)
 677 {
 678         int ret;
 679
 680         BUG_ON(!host);
 681         BUG_ON(!host->card);
 682
 683         mmc_claim_host(host);
 684         ret = mmc_sdio_init_card(host, host->ocr, host->card,
 685                         (host->pm_flags & MMC_PM_KEEP_POWER));
 686         if (!ret && host->sdio_irqs)
 687                 mmc_signal_sdio_irq(host);
 688         mmc_release_host(host);
 689
 690         return ret;
 691 }
 692
 693 static const struct mmc_bus_ops mmc_sdio_ops = {
 694         .remove = mmc_sdio_remove,
 695         .detect = mmc_sdio_detect,
 696         .suspend = mmc_sdio_suspend,
 697         .resume = mmc_sdio_resume,
 698         .power_restore = mmc_sdio_power_restore,
 699 };
 700
 701
 702 /*
 703  * Starting point for SDIO card init.
 704  */
 705 int mmc_attach_sdio(struct mmc_host *host)
 706 {
 707         int err, i, funcs;
 708         u32 ocr;
 709         struct mmc_card *card;
 710
 711         BUG_ON(!host);
 712         WARN_ON(!host->claimed);
 713
 714         err = mmc_send_io_op_cond(host, 0, &ocr);
 715         if (err)
 716                 return err;
 717
 718         mmc_attach_bus(host, &mmc_sdio_ops);
 719         if (host->ocr_avail_sdio)
 720                 host->ocr_avail = host->ocr_avail_sdio;
 721
 722         /*
 723          * Sanity check the voltages that the card claims to
 724          * support.
 725          */
 726         if (ocr & 0x7F) {
 727                 printk(KERN_WARNING "%s: card claims to support voltages "
 728                        "below the defined range. These will be ignored.\n",
 729                        mmc_hostname(host));
 730                 ocr &= ~0x7F;
 731         }
 732
 733         host->ocr = mmc_select_voltage(host, ocr);
 734
 735         /*
 736          * Can we support the voltage(s) of the card(s)?
 737          */
 738         if (!host->ocr) {
 739                 err = -EINVAL;
 740                 goto err;
 741         }
 742
 743         /*
 744          * Detect and init the card.
 745          */
 746         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
 747         if (err)
 748                 goto err;
 749         card = host->card;
 750
 751         /*
 752          * Enable runtime PM only if supported by host+card+board
 753          */
 754         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 755                 /*
 756                  * Let runtime PM core know our card is active
 757                  */
 758                 err = pm_runtime_set_active(&card->dev);
 759                 if (err)
 760                         goto remove;
 761
 762                 /*
 763                  * Enable runtime PM for this card
 764                  */
 765                 pm_runtime_enable(&card->dev);
 766         }
 767
 768         /*
 769          * The number of functions on the card is encoded inside
 770          * the ocr.
 771          */
 772         funcs = (ocr & 0x70000000) >> 28;
 773         card->sdio_funcs = 0;
 774
 775         /*
 776          * Initialize (but don't add) all present functions.
 777          */
 778         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
 779                 err = sdio_init_func(host->card, i + 1);
 780                 if (err)
 781                         goto remove;
 782
 783                 /*
 784                  * Enable Runtime PM for this func (if supported)
 785                  */
 786                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
 787                         pm_runtime_enable(&card->sdio_func[i]->dev);
 788         }
 789
 790         /*
 791          * First add the card to the driver model...
 792          */
 793         mmc_release_host(host);
 794         err = mmc_add_card(host->card);
 795         if (err)
 796                 goto remove_added;
 797
 798         /*
 799          * ...then the SDIO functions.
 800          */
 801         for (i = 0;i < funcs;i++) {
 802                 err = sdio_add_func(host->card->sdio_func[i]);
 803                 if (err)
 804                         goto remove_added;
 805         }
 806
 807         mmc_claim_host(host);
 808         return 0;
 809
 810
 811 remove_added:
 812         /* Remove without lock if the device has been added. */
 813         mmc_sdio_remove(host);
 814         mmc_claim_host(host);
 815 remove:
 816         /* And with lock if it hasn't been added. */
 817         mmc_release_host(host);
 818         if (host->card)
 819                 mmc_sdio_remove(host);
 820         mmc_claim_host(host);
 821 err:
 822         mmc_detach_bus(host);
 823
 824         printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
 825                 mmc_hostname(host), err);
 826
 827         return err;
 828 }
 829