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_3_00) {
 115                 pr_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
 413         /*
 414          * Read CSD, before selecting the card
 415          */
 416         if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
 417                 err = mmc_sd_get_csd(host, card);
 418                 if (err)
 419                         return err;
 420
 421                 mmc_decode_cid(card);
 422         }
 423
 424         /*
 425          * Select card, as all following commands rely on that.
 426          */
 427         if (!powered_resume && !mmc_host_is_spi(host)) {
 428                 err = mmc_select_card(card);
 429                 if (err)
 430                         goto remove;
 431         }
 432
 433         if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
 434                 /*
 435                  * This is non-standard SDIO device, meaning it doesn't
 436                  * have any CIA (Common I/O area) registers present.
 437                  * It's host's responsibility to fill cccr and cis
 438                  * structures in init_card().
 439                  */
 440                 mmc_set_clock(host, card->cis.max_dtr);
 441
 442                 if (card->cccr.high_speed) {
 443                         mmc_card_set_highspeed(card);
 444                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 445                 }
 446
 447                 goto finish;
 448         }
 449
 450         /*
 451          * Read the common registers.
 452          */
 453         err = sdio_read_cccr(card);
 454         if (err)
 455                 goto remove;
 456
 457         /*
 458          * Read the common CIS tuples.
 459          */
 460         err = sdio_read_common_cis(card);
 461         if (err)
 462                 goto remove;
 463
 464         if (oldcard) {
 465                 int same = (card->cis.vendor == oldcard->cis.vendor &&
 466                             card->cis.device == oldcard->cis.device);
 467                 mmc_remove_card(card);
 468                 if (!same)
 469                         return -ENOENT;
 470
 471                 card = oldcard;
 472         }
 473         mmc_fixup_device(card, NULL);
 474
 475         if (card->type == MMC_TYPE_SD_COMBO) {
 476                 err = mmc_sd_setup_card(host, card, oldcard != NULL);
 477                 /* handle as SDIO-only card if memory init failed */
 478                 if (err) {
 479                         mmc_go_idle(host);
 480                         if (mmc_host_is_spi(host))
 481                                 /* should not fail, as it worked previously */
 482                                 mmc_spi_set_crc(host, use_spi_crc);
 483                         card->type = MMC_TYPE_SDIO;
 484                 } else
 485                         card->dev.type = &sd_type;
 486         }
 487
 488         /*
 489          * If needed, disconnect card detection pull-up resistor.
 490          */
 491         err = sdio_disable_cd(card);
 492         if (err)
 493                 goto remove;
 494
 495         /*
 496          * Switch to high-speed (if supported).
 497          */
 498         err = sdio_enable_hs(card);
 499         if (err > 0)
 500                 mmc_sd_go_highspeed(card);
 501         else if (err)
 502                 goto remove;
 503
 504         /*
 505          * Change to the card's maximum speed.
 506          */
 507         mmc_set_clock(host, mmc_sdio_get_max_clock(card));
 508
 509         /*
 510          * Switch to wider bus (if supported).
 511          */
 512         err = sdio_enable_4bit_bus(card);
 513         if (err > 0)
 514                 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 515         else if (err)
 516                 goto remove;
 517
 518 finish:
 519         if (!oldcard)
 520                 host->card = card;
 521         return 0;
 522
 523 remove:
 524         if (!oldcard)
 525                 mmc_remove_card(card);
 526
 527 err:
 528         return err;
 529 }
 530
 531 /*
 532  * Host is being removed. Free up the current card.
 533  */
 534 static void mmc_sdio_remove(struct mmc_host *host)
 535 {
 536         int i;
 537
 538         BUG_ON(!host);
 539         BUG_ON(!host->card);
 540
 541         for (i = 0;i < host->card->sdio_funcs;i++) {
 542                 if (host->card->sdio_func[i]) {
 543                         sdio_remove_func(host->card->sdio_func[i]);
 544                         host->card->sdio_func[i] = NULL;
 545                 }
 546         }
 547
 548         mmc_remove_card(host->card);
 549         host->card = NULL;
 550 }
 551
 552 /*
 553  * Card detection callback from host.
 554  */
 555 static void mmc_sdio_detect(struct mmc_host *host)
 556 {
 557         int err;
 558
 559         BUG_ON(!host);
 560         BUG_ON(!host->card);
 561
 562         /* Make sure card is powered before detecting it */
 563         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 564                 err = pm_runtime_get_sync(&host->card->dev);
 565                 if (err < 0)
 566                         goto out;
 567         }
 568
 569         mmc_claim_host(host);
 570
 571         /*
 572          * Just check if our card has been removed.
 573          */
 574         err = mmc_select_card(host->card);
 575
 576         mmc_release_host(host);
 577
 578         /*
 579          * Tell PM core it's OK to power off the card now.
 580          *
 581          * The _sync variant is used in order to ensure that the card
 582          * is left powered off in case an error occurred, and the card
 583          * is going to be removed.
 584          *
 585          * Since there is no specific reason to believe a new user
 586          * is about to show up at this point, the _sync variant is
 587          * desirable anyway.
 588          */
 589         if (host->caps & MMC_CAP_POWER_OFF_CARD)
 590                 pm_runtime_put_sync(&host->card->dev);
 591
 592 out:
 593         if (err) {
 594                 mmc_sdio_remove(host);
 595
 596                 mmc_claim_host(host);
 597                 mmc_detach_bus(host);
 598                 mmc_power_off(host);
 599                 mmc_release_host(host);
 600         }
 601 }
 602
 603 /*
 604  * SDIO suspend.  We need to suspend all functions separately.
 605  * Therefore all registered functions must have drivers with suspend
 606  * and resume methods.  Failing that we simply remove the whole card.
 607  */
 608 static int mmc_sdio_suspend(struct mmc_host *host)
 609 {
 610         int i, err = 0;
 611
 612         for (i = 0; i < host->card->sdio_funcs; i++) {
 613                 struct sdio_func *func = host->card->sdio_func[i];
 614                 if (func && sdio_func_present(func) && func->dev.driver) {
 615                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 616                         if (!pmops || !pmops->suspend || !pmops->resume) {
 617                                 /* force removal of entire card in that case */
 618                                 err = -ENOSYS;
 619                         } else
 620                                 err = pmops->suspend(&func->dev);
 621                         if (err)
 622                                 break;
 623                 }
 624         }
 625         while (err && --i >= 0) {
 626                 struct sdio_func *func = host->card->sdio_func[i];
 627                 if (func && sdio_func_present(func) && func->dev.driver) {
 628                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 629                         pmops->resume(&func->dev);
 630                 }
 631         }
 632
 633         if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 634                 mmc_claim_host(host);
 635                 sdio_disable_wide(host->card);
 636                 mmc_release_host(host);
 637         }
 638
 639         return err;
 640 }
 641
 642 static int mmc_sdio_resume(struct mmc_host *host)
 643 {
 644         int i, err = 0;
 645
 646         BUG_ON(!host);
 647         BUG_ON(!host->card);
 648
 649         /* Basic card reinitialization. */
 650         mmc_claim_host(host);
 651
 652         /* No need to reinitialize powered-resumed nonremovable cards */
 653         if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
 654                 err = mmc_sdio_init_card(host, host->ocr, host->card,
 655                                         mmc_card_keep_power(host));
 656         else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 657                 /* We may have switched to 1-bit mode during suspend */
 658                 err = sdio_enable_4bit_bus(host->card);
 659                 if (err > 0) {
 660                         mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
 661                         err = 0;
 662                 }
 663         }
 664
 665         if (!err && host->sdio_irqs)
 666                 mmc_signal_sdio_irq(host);
 667         mmc_release_host(host);
 668
 669         /*
 670          * If the card looked to be the same as before suspending, then
 671          * we proceed to resume all card functions.  If one of them returns
 672          * an error then we simply return that error to the core and the
 673          * card will be redetected as new.  It is the responsibility of
 674          * the function driver to perform further tests with the extra
 675          * knowledge it has of the card to confirm the card is indeed the
 676          * same as before suspending (same MAC address for network cards,
 677          * etc.) and return an error otherwise.
 678          */
 679         for (i = 0; !err && i < host->card->sdio_funcs; i++) {
 680                 struct sdio_func *func = host->card->sdio_func[i];
 681                 if (func && sdio_func_present(func) && func->dev.driver) {
 682                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 683                         err = pmops->resume(&func->dev);
 684                 }
 685         }
 686
 687         return err;
 688 }
 689
 690 static int mmc_sdio_power_restore(struct mmc_host *host)
 691 {
 692         int ret;
 693         u32 ocr;
 694
 695         BUG_ON(!host);
 696         BUG_ON(!host->card);
 697
 698         mmc_claim_host(host);
 699
 700         /*
 701          * Reset the card by performing the same steps that are taken by
 702          * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
 703          *
 704          * sdio_reset() is technically not needed. Having just powered up the
 705          * hardware, it should already be in reset state. However, some
 706          * platforms (such as SD8686 on OLPC) do not instantly cut power,
 707          * meaning that a reset is required when restoring power soon after
 708          * powering off. It is harmless in other cases.
 709          *
 710          * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
 711          * is not necessary for non-removable cards. However, it is required
 712          * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
 713          * harmless in other situations.
 714          *
 715          * With these steps taken, mmc_select_voltage() is also required to
 716          * restore the correct voltage setting of the card.
 717          */
 718         sdio_reset(host);
 719         mmc_go_idle(host);
 720         mmc_send_if_cond(host, host->ocr_avail);
 721
 722         ret = mmc_send_io_op_cond(host, 0, &ocr);
 723         if (ret)
 724                 goto out;
 725
 726         if (host->ocr_avail_sdio)
 727                 host->ocr_avail = host->ocr_avail_sdio;
 728
 729         host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
 730         if (!host->ocr) {
 731                 ret = -EINVAL;
 732                 goto out;
 733         }
 734
 735         ret = mmc_sdio_init_card(host, host->ocr, host->card,
 736                                 mmc_card_keep_power(host));
 737         if (!ret && host->sdio_irqs)
 738                 mmc_signal_sdio_irq(host);
 739
 740 out:
 741         mmc_release_host(host);
 742
 743         return ret;
 744 }
 745
 746 static const struct mmc_bus_ops mmc_sdio_ops = {
 747         .remove = mmc_sdio_remove,
 748         .detect = mmc_sdio_detect,
 749         .suspend = mmc_sdio_suspend,
 750         .resume = mmc_sdio_resume,
 751         .power_restore = mmc_sdio_power_restore,
 752 };
 753
 754
 755 /*
 756  * Starting point for SDIO card init.
 757  */
 758 int mmc_attach_sdio(struct mmc_host *host)
 759 {
 760         int err, i, funcs;
 761         u32 ocr;
 762         struct mmc_card *card;
 763
 764         BUG_ON(!host);
 765         WARN_ON(!host->claimed);
 766
 767         err = mmc_send_io_op_cond(host, 0, &ocr);
 768         if (err)
 769                 return err;
 770
 771         mmc_attach_bus(host, &mmc_sdio_ops);
 772         if (host->ocr_avail_sdio)
 773                 host->ocr_avail = host->ocr_avail_sdio;
 774
 775         /*
 776          * Sanity check the voltages that the card claims to
 777          * support.
 778          */
 779         if (ocr & 0x7F) {
 780                 pr_warning("%s: card claims to support voltages "
 781                        "below the defined range. These will be ignored.\n",
 782                        mmc_hostname(host));
 783                 ocr &= ~0x7F;
 784         }
 785
 786         host->ocr = mmc_select_voltage(host, ocr);
 787
 788         /*
 789          * Can we support the voltage(s) of the card(s)?
 790          */
 791         if (!host->ocr) {
 792                 err = -EINVAL;
 793                 goto err;
 794         }
 795
 796         /*
 797          * Detect and init the card.
 798          */
 799         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
 800         if (err)
 801                 goto err;
 802         card = host->card;
 803
 804         /*
 805          * Enable runtime PM only if supported by host+card+board
 806          */
 807         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 808                 /*
 809                  * Let runtime PM core know our card is active
 810                  */
 811                 err = pm_runtime_set_active(&card->dev);
 812                 if (err)
 813                         goto remove;
 814
 815                 /*
 816                  * Enable runtime PM for this card
 817                  */
 818                 pm_runtime_enable(&card->dev);
 819         }
 820
 821         /*
 822          * The number of functions on the card is encoded inside
 823          * the ocr.
 824          */
 825         funcs = (ocr & 0x70000000) >> 28;
 826         card->sdio_funcs = 0;
 827
 828         /*
 829          * Initialize (but don't add) all present functions.
 830          */
 831         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
 832                 err = sdio_init_func(host->card, i + 1);
 833                 if (err)
 834                         goto remove;
 835
 836                 /*
 837                  * Enable Runtime PM for this func (if supported)
 838                  */
 839                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
 840                         pm_runtime_enable(&card->sdio_func[i]->dev);
 841         }
 842
 843         /*
 844          * First add the card to the driver model...
 845          */
 846         mmc_release_host(host);
 847         err = mmc_add_card(host->card);
 848         if (err)
 849                 goto remove_added;
 850
 851         /*
 852          * ...then the SDIO functions.
 853          */
 854         for (i = 0;i < funcs;i++) {
 855                 err = sdio_add_func(host->card->sdio_func[i]);
 856                 if (err)
 857                         goto remove_added;
 858         }
 859
 860         mmc_claim_host(host);
 861         return 0;
 862
 863
 864 remove_added:
 865         /* Remove without lock if the device has been added. */
 866         mmc_sdio_remove(host);
 867         mmc_claim_host(host);
 868 remove:
 869         /* And with lock if it hasn't been added. */
 870         mmc_release_host(host);
 871         if (host->card)
 872                 mmc_sdio_remove(host);
 873         mmc_claim_host(host);
 874 err:
 875         mmc_detach_bus(host);
 876
 877         pr_err("%s: error %d whilst initialising SDIO card\n",
 878                 mmc_hostname(host), err);
 879
 880         return err;
 881 }
 882