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 #include <linux/mmc/sdio_ids.h>
  20
  21 #include "core.h"
  22 #include "bus.h"
  23 #include "sd.h"
  24 #include "sdio_bus.h"
  25 #include "mmc_ops.h"
  26 #include "sd_ops.h"
  27 #include "sdio_ops.h"
  28 #include "sdio_cis.h"
  29
  30 static int sdio_read_fbr(struct sdio_func *func)
  31 {
  32         int ret;
  33         unsigned char data;
  34
  35         if (mmc_card_nonstd_func_interface(func->card)) {
  36                 func->class = SDIO_CLASS_NONE;
  37                 return 0;
  38         }
  39
  40         ret = mmc_io_rw_direct(func->card, 0, 0,
  41                 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
  42         if (ret)
  43                 goto out;
  44
  45         data &= 0x0f;
  46
  47         if (data == 0x0f) {
  48                 ret = mmc_io_rw_direct(func->card, 0, 0,
  49                         SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
  50                 if (ret)
  51                         goto out;
  52         }
  53
  54         func->class = data;
  55
  56 out:
  57         return ret;
  58 }
  59
  60 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
  61 {
  62         int ret;
  63         struct sdio_func *func;
  64
  65         BUG_ON(fn > SDIO_MAX_FUNCS);
  66
  67         func = sdio_alloc_func(card);
  68         if (IS_ERR(func))
  69                 return PTR_ERR(func);
  70
  71         func->num = fn;
  72
  73         if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
  74                 ret = sdio_read_fbr(func);
  75                 if (ret)
  76                         goto fail;
  77
  78                 ret = sdio_read_func_cis(func);
  79                 if (ret)
  80                         goto fail;
  81         } else {
  82                 func->vendor = func->card->cis.vendor;
  83                 func->device = func->card->cis.device;
  84                 func->max_blksize = func->card->cis.blksize;
  85         }
  86
  87         card->sdio_func[fn - 1] = func;
  88
  89         return 0;
  90
  91 fail:
  92         /*
  93          * It is okay to remove the function here even though we hold
  94          * the host lock as we haven't registered the device yet.
  95          */
  96         sdio_remove_func(func);
  97         return ret;
  98 }
  99
 100 static int sdio_read_cccr(struct mmc_card *card)
 101 {
 102         int ret;
 103         int cccr_vsn;
 104         unsigned char data;
 105
 106         memset(&card->cccr, 0, sizeof(struct sdio_cccr));
 107
 108         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
 109         if (ret)
 110                 goto out;
 111
 112         cccr_vsn = data & 0x0f;
 113
 114         if (cccr_vsn > SDIO_CCCR_REV_1_20) {
 115                 printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
 116                         mmc_hostname(card->host), cccr_vsn);
 117                 return -EINVAL;
 118         }
 119
 120         card->cccr.sdio_vsn = (data & 0xf0) >> 4;
 121
 122         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
 123         if (ret)
 124                 goto out;
 125
 126         if (data & SDIO_CCCR_CAP_SMB)
 127                 card->cccr.multi_block = 1;
 128         if (data & SDIO_CCCR_CAP_LSC)
 129                 card->cccr.low_speed = 1;
 130         if (data & SDIO_CCCR_CAP_4BLS)
 131                 card->cccr.wide_bus = 1;
 132
 133         if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
 134                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
 135                 if (ret)
 136                         goto out;
 137
 138                 if (data & SDIO_POWER_SMPC)
 139                         card->cccr.high_power = 1;
 140         }
 141
 142         if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
 143                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
 144                 if (ret)
 145                         goto out;
 146
 147                 if (data & SDIO_SPEED_SHS)
 148                         card->cccr.high_speed = 1;
 149         }
 150
 151 out:
 152         return ret;
 153 }
 154
 155 static int sdio_enable_wide(struct mmc_card *card)
 156 {
 157         int ret;
 158         u8 ctrl;
 159
 160         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 161                 return 0;
 162
 163         if (card->cccr.low_speed && !card->cccr.wide_bus)
 164                 return 0;
 165
 166         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 167         if (ret)
 168                 return ret;
 169
 170         ctrl |= SDIO_BUS_WIDTH_4BIT;
 171
 172         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 173         if (ret)
 174                 return ret;
 175
 176         return 1;
 177 }
 178
 179 /*
 180  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
 181  * of the card. This may be required on certain setups of boards,
 182  * controllers and embedded sdio device which do not need the card's
 183  * pull-up. As a result, card detection is disabled and power is saved.
 184  */
 185 static int sdio_disable_cd(struct mmc_card *card)
 186 {
 187         int ret;
 188         u8 ctrl;
 189
 190         if (!mmc_card_disable_cd(card))
 191                 return 0;
 192
 193         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 194         if (ret)
 195                 return ret;
 196
 197         ctrl |= SDIO_BUS_CD_DISABLE;
 198
 199         return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 200 }
 201
 202 /*
 203  * Devices that remain active during a system suspend are
 204  * put back into 1-bit mode.
 205  */
 206 static int sdio_disable_wide(struct mmc_card *card)
 207 {
 208         int ret;
 209         u8 ctrl;
 210
 211         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 212                 return 0;
 213
 214         if (card->cccr.low_speed && !card->cccr.wide_bus)
 215                 return 0;
 216
 217         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 218         if (ret)
 219                 return ret;
 220
 221         if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
 222                 return 0;
 223
 224         ctrl &= ~SDIO_BUS_WIDTH_4BIT;
 225         ctrl |= SDIO_BUS_ASYNC_INT;
 226
 227         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 228         if (ret)
 229                 return ret;
 230
 231         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
 232
 233         return 0;
 234 }
 235
 236
 237 static int sdio_enable_4bit_bus(struct mmc_card *card)
 238 {
 239         int err;
 240
 241         if (card->type == MMC_TYPE_SDIO)
 242                 return sdio_enable_wide(card);
 243
 244         if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
 245                 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 246                 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 247                 if (err)
 248                         return err;
 249         } else
 250                 return 0;
 251
 252         err = sdio_enable_wide(card);
 253         if (err <= 0)
 254                 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
 255
 256         return err;
 257 }
 258
 259
 260 /*
 261  * Test if the card supports high-speed mode and, if so, switch to it.
 262  */
 263 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
 264 {
 265         int ret;
 266         u8 speed;
 267
 268         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
 269                 return 0;
 270
 271         if (!card->cccr.high_speed)
 272                 return 0;
 273
 274         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 275         if (ret)
 276                 return ret;
 277
 278         if (enable)
 279                 speed |= SDIO_SPEED_EHS;
 280         else
 281                 speed &= ~SDIO_SPEED_EHS;
 282
 283         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 284         if (ret)
 285                 return ret;
 286
 287         return 1;
 288 }
 289
 290 /*
 291  * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
 292  */
 293 static int sdio_enable_hs(struct mmc_card *card)
 294 {
 295         int ret;
 296
 297         ret = mmc_sdio_switch_hs(card, true);
 298         if (ret <= 0 || card->type == MMC_TYPE_SDIO)
 299                 return ret;
 300
 301         ret = mmc_sd_switch_hs(card);
 302         if (ret <= 0)
 303                 mmc_sdio_switch_hs(card, false);
 304
 305         return ret;
 306 }
 307
 308 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
 309 {
 310         unsigned max_dtr;
 311
 312         if (mmc_card_highspeed(card)) {
 313                 /*
 314                  * The SDIO specification doesn't mention how
 315                  * the CIS transfer speed register relates to
 316                  * high-speed, but it seems that 50 MHz is
 317                  * mandatory.
 318                  */
 319                 max_dtr = 50000000;
 320         } else {
 321                 max_dtr = card->cis.max_dtr;
 322         }
 323
 324         if (card->type == MMC_TYPE_SD_COMBO)
 325                 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
 326
 327         return max_dtr;
 328 }
 329
 330 /*
 331  * Handle the detection and initialisation of a card.
 332  *
 333  * In the case of a resume, "oldcard" will contain the card
 334  * we're trying to reinitialise.
 335  */
 336 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 337                               struct mmc_card *oldcard, int powered_resume)
 338 {
 339         struct mmc_card *card;
 340         int err;
 341
 342         BUG_ON(!host);
 343         WARN_ON(!host->claimed);
 344
 345         /*
 346          * Inform the card of the voltage
 347          */
 348         if (!powered_resume) {
 349                 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
 350                 if (err)
 351                         goto err;
 352         }
 353
 354         /*
 355          * For SPI, enable CRC as appropriate.
 356          */
 357         if (mmc_host_is_spi(host)) {
 358                 err = mmc_spi_set_crc(host, use_spi_crc);
 359                 if (err)
 360                         goto err;
 361         }
 362
 363         /*
 364          * Allocate card structure.
 365          */
 366         card = mmc_alloc_card(host, NULL);
 367         if (IS_ERR(card)) {
 368                 err = PTR_ERR(card);
 369                 goto err;
 370         }
 371
 372         if ((ocr & R4_MEMORY_PRESENT) &&
 373             mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
 374                 card->type = MMC_TYPE_SD_COMBO;
 375
 376                 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
 377                     memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
 378                         mmc_remove_card(card);
 379                         return -ENOENT;
 380                 }
 381         } else {
 382                 card->type = MMC_TYPE_SDIO;
 383
 384                 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
 385                         mmc_remove_card(card);
 386                         return -ENOENT;
 387                 }
 388         }
 389
 390         /*
 391          * Call the optional HC's init_card function to handle quirks.
 392          */
 393         if (host->ops->init_card)
 394                 host->ops->init_card(host, card);
 395
 396         /*
 397          * For native busses:  set card RCA and quit open drain mode.
 398          */
 399         if (!powered_resume && !mmc_host_is_spi(host)) {
 400                 err = mmc_send_relative_addr(host, &card->rca);
 401                 if (err)
 402                         goto remove;
 403
 404                 /*
 405                  * Update oldcard with the new RCA received from the SDIO
 406                  * device -- we're doing this so that it's updated in the
 407                  * "card" struct when oldcard overwrites that later.
 408                  */
 409                 if (oldcard)
 410                         oldcard->rca = card->rca;
 411
 412                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 413         }
 414
 415         /*
 416          * Read CSD, before selecting the card
 417          */
 418         if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
 419                 err = mmc_sd_get_csd(host, card);
 420                 if (err)
 421                         return err;
 422
 423                 mmc_decode_cid(card);
 424         }
 425
 426         /*
 427          * Select card, as all following commands rely on that.
 428          */
 429         if (!powered_resume && !mmc_host_is_spi(host)) {
 430                 err = mmc_select_card(card);
 431                 if (err)
 432                         goto remove;
 433         }
 434
 435         if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
 436                 /*
 437                  * This is non-standard SDIO device, meaning it doesn't
 438                  * have any CIA (Common I/O area) registers present.
 439                  * It's host's responsibility to fill cccr and cis
 440                  * structures in init_card().
 441                  */
 442                 mmc_set_clock(host, card->cis.max_dtr);
 443
 444                 if (card->cccr.high_speed) {
 445                         mmc_card_set_highspeed(card);
 446                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 447                 }
 448
 449                 goto finish;
 450         }
 451
 452         /*
 453          * Read the common registers.
 454          */
 455         err = sdio_read_cccr(card);
 456         if (err)
 457                 goto remove;
 458
 459         /*
 460          * Read the common CIS tuples.
 461          */
 462         err = sdio_read_common_cis(card);
 463         if (err)
 464                 goto remove;
 465
 466         if (oldcard) {
 467                 int same = (card->cis.vendor == oldcard->cis.vendor &&
 468                             card->cis.device == oldcard->cis.device);
 469                 mmc_remove_card(card);
 470                 if (!same)
 471                         return -ENOENT;
 472
 473                 card = oldcard;
 474         }
 475         mmc_fixup_device(card, NULL);
 476
 477         if (card->type == MMC_TYPE_SD_COMBO) {
 478                 err = mmc_sd_setup_card(host, card, oldcard != NULL);
 479                 /* handle as SDIO-only card if memory init failed */
 480                 if (err) {
 481                         mmc_go_idle(host);
 482                         if (mmc_host_is_spi(host))
 483                                 /* should not fail, as it worked previously */
 484                                 mmc_spi_set_crc(host, use_spi_crc);
 485                         card->type = MMC_TYPE_SDIO;
 486                 } else
 487                         card->dev.type = &sd_type;
 488         }
 489
 490         /*
 491          * If needed, disconnect card detection pull-up resistor.
 492          */
 493         err = sdio_disable_cd(card);
 494         if (err)
 495                 goto remove;
 496
 497         /*
 498          * Switch to high-speed (if supported).
 499          */
 500         err = sdio_enable_hs(card);
 501         if (err > 0)
 502                 mmc_sd_go_highspeed(card);
 503         else if (err)
 504                 goto remove;
 505
 506         /*
 507          * Change to the card's maximum speed.
 508          */
 509         mmc_set_clock(host, mmc_sdio_get_max_clock(card));
 510
 511         /*
 512          * Switch to wider bus (if supported).
 513          */
 514         err = sdio_enable_4bit_bus(card);
 515         if (err > 0)
 516                 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 517         else if (err)
 518                 goto remove;
 519
 520 finish:
 521         if (!oldcard)
 522                 host->card = card;
 523         return 0;
 524
 525 remove:
 526         if (!oldcard)
 527                 mmc_remove_card(card);
 528
 529 err:
 530         return err;
 531 }
 532
 533 /*
 534  * Host is being removed. Free up the current card.
 535  */
 536 static void mmc_sdio_remove(struct mmc_host *host)
 537 {
 538         int i;
 539
 540         BUG_ON(!host);
 541         BUG_ON(!host->card);
 542
 543         for (i = 0;i < host->card->sdio_funcs;i++) {
 544                 if (host->card->sdio_func[i]) {
 545                         sdio_remove_func(host->card->sdio_func[i]);
 546                         host->card->sdio_func[i] = NULL;
 547                 }
 548         }
 549
 550         mmc_remove_card(host->card);
 551         host->card = NULL;
 552 }
 553
 554 /*
 555  * Card detection callback from host.
 556  */
 557 static void mmc_sdio_detect(struct mmc_host *host)
 558 {
 559         int err;
 560
 561         BUG_ON(!host);
 562         BUG_ON(!host->card);
 563
 564         /* Make sure card is powered before detecting it */
 565         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 566                 err = pm_runtime_get_sync(&host->card->dev);
 567                 if (err < 0)
 568                         goto out;
 569         }
 570
 571         mmc_claim_host(host);
 572
 573         /*
 574          * Just check if our card has been removed.
 575          */
 576         err = mmc_select_card(host->card);
 577
 578         mmc_release_host(host);
 579
 580         /*
 581          * Tell PM core it's OK to power off the card now.
 582          *
 583          * The _sync variant is used in order to ensure that the card
 584          * is left powered off in case an error occurred, and the card
 585          * is going to be removed.
 586          *
 587          * Since there is no specific reason to believe a new user
 588          * is about to show up at this point, the _sync variant is
 589          * desirable anyway.
 590          */
 591         if (host->caps & MMC_CAP_POWER_OFF_CARD)
 592                 pm_runtime_put_sync(&host->card->dev);
 593
 594 out:
 595         if (err) {
 596                 mmc_sdio_remove(host);
 597
 598                 mmc_claim_host(host);
 599                 mmc_detach_bus(host);
 600                 mmc_release_host(host);
 601         }
 602 }
 603
 604 /*
 605  * SDIO suspend.  We need to suspend all functions separately.
 606  * Therefore all registered functions must have drivers with suspend
 607  * and resume methods.  Failing that we simply remove the whole card.
 608  */
 609 static int mmc_sdio_suspend(struct mmc_host *host)
 610 {
 611         int i, err = 0;
 612
 613         for (i = 0; i < host->card->sdio_funcs; i++) {
 614                 struct sdio_func *func = host->card->sdio_func[i];
 615                 if (func && sdio_func_present(func) && func->dev.driver) {
 616                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 617                         if (!pmops || !pmops->suspend || !pmops->resume) {
 618                                 /* force removal of entire card in that case */
 619                                 err = -ENOSYS;
 620                         } else
 621                                 err = pmops->suspend(&func->dev);
 622                         if (err)
 623                                 break;
 624                 }
 625         }
 626         while (err && --i >= 0) {
 627                 struct sdio_func *func = host->card->sdio_func[i];
 628                 if (func && sdio_func_present(func) && func->dev.driver) {
 629                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 630                         pmops->resume(&func->dev);
 631                 }
 632         }
 633
 634         if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 635                 mmc_claim_host(host);
 636                 sdio_disable_wide(host->card);
 637                 mmc_release_host(host);
 638         }
 639
 640         return err;
 641 }
 642
 643 static int mmc_sdio_resume(struct mmc_host *host)
 644 {
 645         int i, err = 0;
 646
 647         BUG_ON(!host);
 648         BUG_ON(!host->card);
 649
 650         /* Basic card reinitialization. */
 651         mmc_claim_host(host);
 652
 653         /* No need to reinitialize powered-resumed nonremovable cards */
 654         if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
 655                 err = mmc_sdio_init_card(host, host->ocr, host->card,
 656                                         mmc_card_keep_power(host));
 657         else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 658                 /* We may have switched to 1-bit mode during suspend */
 659                 err = sdio_enable_4bit_bus(host->card);
 660                 if (err > 0) {
 661                         mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
 662                         err = 0;
 663                 }
 664         }
 665
 666         if (!err && host->sdio_irqs)
 667                 mmc_signal_sdio_irq(host);
 668         mmc_release_host(host);
 669
 670         /*
 671          * If the card looked to be the same as before suspending, then
 672          * we proceed to resume all card functions.  If one of them returns
 673          * an error then we simply return that error to the core and the
 674          * card will be redetected as new.  It is the responsibility of
 675          * the function driver to perform further tests with the extra
 676          * knowledge it has of the card to confirm the card is indeed the
 677          * same as before suspending (same MAC address for network cards,
 678          * etc.) and return an error otherwise.
 679          */
 680         for (i = 0; !err && i < host->card->sdio_funcs; i++) {
 681                 struct sdio_func *func = host->card->sdio_func[i];
 682                 if (func && sdio_func_present(func) && func->dev.driver) {
 683                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 684                         err = pmops->resume(&func->dev);
 685                 }
 686         }
 687
 688         return err;
 689 }
 690
 691 static int mmc_sdio_power_restore(struct mmc_host *host)
 692 {
 693         int ret;
 694         u32 ocr;
 695
 696         BUG_ON(!host);
 697         BUG_ON(!host->card);
 698
 699         mmc_claim_host(host);
 700
 701         /*
 702          * Reset the card by performing the same steps that are taken by
 703          * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
 704          *
 705          * sdio_reset() is technically not needed. Having just powered up the
 706          * hardware, it should already be in reset state. However, some
 707          * platforms (such as SD8686 on OLPC) do not instantly cut power,
 708          * meaning that a reset is required when restoring power soon after
 709          * powering off. It is harmless in other cases.
 710          *
 711          * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
 712          * is not necessary for non-removable cards. However, it is required
 713          * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
 714          * harmless in other situations.
 715          *
 716          * With these steps taken, mmc_select_voltage() is also required to
 717          * restore the correct voltage setting of the card.
 718          */
 719         sdio_reset(host);
 720         mmc_go_idle(host);
 721         mmc_send_if_cond(host, host->ocr_avail);
 722
 723         ret = mmc_send_io_op_cond(host, 0, &ocr);
 724         if (ret)
 725                 goto out;
 726
 727         if (host->ocr_avail_sdio)
 728                 host->ocr_avail = host->ocr_avail_sdio;
 729
 730         host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
 731         if (!host->ocr) {
 732                 ret = -EINVAL;
 733                 goto out;
 734         }
 735
 736         ret = mmc_sdio_init_card(host, host->ocr, host->card,
 737                                 mmc_card_keep_power(host));
 738         if (!ret && host->sdio_irqs)
 739                 mmc_signal_sdio_irq(host);
 740
 741 out:
 742         mmc_release_host(host);
 743
 744         return ret;
 745 }
 746
 747 static const struct mmc_bus_ops mmc_sdio_ops = {
 748         .remove = mmc_sdio_remove,
 749         .detect = mmc_sdio_detect,
 750         .suspend = mmc_sdio_suspend,
 751         .resume = mmc_sdio_resume,
 752         .power_restore = mmc_sdio_power_restore,
 753 };
 754
 755
 756 /*
 757  * Starting point for SDIO card init.
 758  */
 759 int mmc_attach_sdio(struct mmc_host *host)
 760 {
 761         int err, i, funcs;
 762         u32 ocr;
 763         struct mmc_card *card;
 764
 765         BUG_ON(!host);
 766         WARN_ON(!host->claimed);
 767
 768         err = mmc_send_io_op_cond(host, 0, &ocr);
 769         if (err)
 770                 return err;
 771
 772         mmc_attach_bus(host, &mmc_sdio_ops);
 773         if (host->ocr_avail_sdio)
 774                 host->ocr_avail = host->ocr_avail_sdio;
 775
 776         /*
 777          * Sanity check the voltages that the card claims to
 778          * support.
 779          */
 780         if (ocr & 0x7F) {
 781                 printk(KERN_WARNING "%s: card claims to support voltages "
 782                        "below the defined range. These will be ignored.\n",
 783                        mmc_hostname(host));
 784                 ocr &= ~0x7F;
 785         }
 786
 787         host->ocr = mmc_select_voltage(host, ocr);
 788
 789         /*
 790          * Can we support the voltage(s) of the card(s)?
 791          */
 792         if (!host->ocr) {
 793                 err = -EINVAL;
 794                 goto err;
 795         }
 796
 797         /*
 798          * Detect and init the card.
 799          */
 800         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
 801         if (err)
 802                 goto err;
 803         card = host->card;
 804
 805         /*
 806          * Enable runtime PM only if supported by host+card+board
 807          */
 808         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 809                 /*
 810                  * Let runtime PM core know our card is active
 811                  */
 812                 err = pm_runtime_set_active(&card->dev);
 813                 if (err)
 814                         goto remove;
 815
 816                 /*
 817                  * Enable runtime PM for this card
 818                  */
 819                 pm_runtime_enable(&card->dev);
 820         }
 821
 822         /*
 823          * The number of functions on the card is encoded inside
 824          * the ocr.
 825          */
 826         funcs = (ocr & 0x70000000) >> 28;
 827         card->sdio_funcs = 0;
 828
 829         /*
 830          * Initialize (but don't add) all present functions.
 831          */
 832         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
 833                 err = sdio_init_func(host->card, i + 1);
 834                 if (err)
 835                         goto remove;
 836
 837                 /*
 838                  * Enable Runtime PM for this func (if supported)
 839                  */
 840                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
 841                         pm_runtime_enable(&card->sdio_func[i]->dev);
 842         }
 843
 844         /*
 845          * First add the card to the driver model...
 846          */
 847         mmc_release_host(host);
 848         err = mmc_add_card(host->card);
 849         if (err)
 850                 goto remove_added;
 851
 852         /*
 853          * ...then the SDIO functions.
 854          */
 855         for (i = 0;i < funcs;i++) {
 856                 err = sdio_add_func(host->card->sdio_func[i]);
 857                 if (err)
 858                         goto remove_added;
 859         }
 860
 861         mmc_claim_host(host);
 862         return 0;
 863
 864
 865 remove_added:
 866         /* Remove without lock if the device has been added. */
 867         mmc_sdio_remove(host);
 868         mmc_claim_host(host);
 869 remove:
 870         /* And with lock if it hasn't been added. */
 871         mmc_release_host(host);
 872         if (host->card)
 873                 mmc_sdio_remove(host);
 874         mmc_claim_host(host);
 875 err:
 876         mmc_detach_bus(host);
 877
 878         printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
 879                 mmc_hostname(host), err);
 880
 881         return err;
 882 }
 883