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/mmc.h>
  18 #include <linux/mmc/sdio.h>
  19 #include <linux/mmc/sdio_func.h>
  20 #include <linux/mmc/sdio_ids.h>
  21
  22 #include "core.h"
  23 #include "bus.h"
  24 #include "sd.h"
  25 #include "sdio_bus.h"
  26 #include "mmc_ops.h"
  27 #include "sd_ops.h"
  28 #include "sdio_ops.h"
  29 #include "sdio_cis.h"
  30
  31 static int sdio_read_fbr(struct sdio_func *func)
  32 {
  33         int ret;
  34         unsigned char data;
  35
  36         if (mmc_card_nonstd_func_interface(func->card)) {
  37                 func->class = SDIO_CLASS_NONE;
  38                 return 0;
  39         }
  40
  41         ret = mmc_io_rw_direct(func->card, 0, 0,
  42                 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
  43         if (ret)
  44                 goto out;
  45
  46         data &= 0x0f;
  47
  48         if (data == 0x0f) {
  49                 ret = mmc_io_rw_direct(func->card, 0, 0,
  50                         SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
  51                 if (ret)
  52                         goto out;
  53         }
  54
  55         func->class = data;
  56
  57 out:
  58         return ret;
  59 }
  60
  61 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
  62 {
  63         int ret;
  64         struct sdio_func *func;
  65
  66         BUG_ON(fn > SDIO_MAX_FUNCS);
  67
  68         func = sdio_alloc_func(card);
  69         if (IS_ERR(func))
  70                 return PTR_ERR(func);
  71
  72         func->num = fn;
  73
  74         if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
  75                 ret = sdio_read_fbr(func);
  76                 if (ret)
  77                         goto fail;
  78
  79                 ret = sdio_read_func_cis(func);
  80                 if (ret)
  81                         goto fail;
  82         } else {
  83                 func->vendor = func->card->cis.vendor;
  84                 func->device = func->card->cis.device;
  85                 func->max_blksize = func->card->cis.blksize;
  86         }
  87
  88         card->sdio_func[fn - 1] = func;
  89
  90         return 0;
  91
  92 fail:
  93         /*
  94          * It is okay to remove the function here even though we hold
  95          * the host lock as we haven't registered the device yet.
  96          */
  97         sdio_remove_func(func);
  98         return ret;
  99 }
 100
 101 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
 102 {
 103         int ret;
 104         int cccr_vsn;
 105         int uhs = ocr & R4_18V_PRESENT;
 106         unsigned char data;
 107         unsigned char speed;
 108
 109         memset(&card->cccr, 0, sizeof(struct sdio_cccr));
 110
 111         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
 112         if (ret)
 113                 goto out;
 114
 115         cccr_vsn = data & 0x0f;
 116
 117         if (cccr_vsn > SDIO_CCCR_REV_3_00) {
 118                 pr_err("%s: unrecognised CCCR structure version %d\n",
 119                         mmc_hostname(card->host), cccr_vsn);
 120                 return -EINVAL;
 121         }
 122
 123         card->cccr.sdio_vsn = (data & 0xf0) >> 4;
 124
 125         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
 126         if (ret)
 127                 goto out;
 128
 129         if (data & SDIO_CCCR_CAP_SMB)
 130                 card->cccr.multi_block = 1;
 131         if (data & SDIO_CCCR_CAP_LSC)
 132                 card->cccr.low_speed = 1;
 133         if (data & SDIO_CCCR_CAP_4BLS)
 134                 card->cccr.wide_bus = 1;
 135
 136         if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
 137                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
 138                 if (ret)
 139                         goto out;
 140
 141                 if (data & SDIO_POWER_SMPC)
 142                         card->cccr.high_power = 1;
 143         }
 144
 145         if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
 146                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 147                 if (ret)
 148                         goto out;
 149
 150                 card->scr.sda_spec3 = 0;
 151                 card->sw_caps.sd3_bus_mode = 0;
 152                 card->sw_caps.sd3_drv_type = 0;
 153                 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
 154                         card->scr.sda_spec3 = 1;
 155                         ret = mmc_io_rw_direct(card, 0, 0,
 156                                 SDIO_CCCR_UHS, 0, &data);
 157                         if (ret)
 158                                 goto out;
 159
 160                         if (card->host->caps &
 161                                 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
 162                                  MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
 163                                  MMC_CAP_UHS_DDR50)) {
 164                                 if (data & SDIO_UHS_DDR50)
 165                                         card->sw_caps.sd3_bus_mode
 166                                                 |= SD_MODE_UHS_DDR50;
 167
 168                                 if (data & SDIO_UHS_SDR50)
 169                                         card->sw_caps.sd3_bus_mode
 170                                                 |= SD_MODE_UHS_SDR50;
 171
 172                                 if (data & SDIO_UHS_SDR104)
 173                                         card->sw_caps.sd3_bus_mode
 174                                                 |= SD_MODE_UHS_SDR104;
 175                         }
 176
 177                         ret = mmc_io_rw_direct(card, 0, 0,
 178                                 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
 179                         if (ret)
 180                                 goto out;
 181
 182                         if (data & SDIO_DRIVE_SDTA)
 183                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
 184                         if (data & SDIO_DRIVE_SDTC)
 185                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
 186                         if (data & SDIO_DRIVE_SDTD)
 187                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
 188                 }
 189
 190                 /* if no uhs mode ensure we check for high speed */
 191                 if (!card->sw_caps.sd3_bus_mode) {
 192                         if (speed & SDIO_SPEED_SHS) {
 193                                 card->cccr.high_speed = 1;
 194                                 card->sw_caps.hs_max_dtr = 50000000;
 195                         } else {
 196                                 card->cccr.high_speed = 0;
 197                                 card->sw_caps.hs_max_dtr = 25000000;
 198                         }
 199                 }
 200         }
 201
 202 out:
 203         return ret;
 204 }
 205
 206 static int sdio_enable_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_MASK) == SDIO_BUS_WIDTH_RESERVED)
 222                 pr_warning("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
 223                            mmc_hostname(card->host), ctrl);
 224
 225         /* set as 4-bit bus width */
 226         ctrl &= ~SDIO_BUS_WIDTH_MASK;
 227         ctrl |= SDIO_BUS_WIDTH_4BIT;
 228
 229         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 230         if (ret)
 231                 return ret;
 232
 233         return 1;
 234 }
 235
 236 /*
 237  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
 238  * of the card. This may be required on certain setups of boards,
 239  * controllers and embedded sdio device which do not need the card's
 240  * pull-up. As a result, card detection is disabled and power is saved.
 241  */
 242 static int sdio_disable_cd(struct mmc_card *card)
 243 {
 244         int ret;
 245         u8 ctrl;
 246
 247         if (!mmc_card_disable_cd(card))
 248                 return 0;
 249
 250         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 251         if (ret)
 252                 return ret;
 253
 254         ctrl |= SDIO_BUS_CD_DISABLE;
 255
 256         return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 257 }
 258
 259 /*
 260  * Devices that remain active during a system suspend are
 261  * put back into 1-bit mode.
 262  */
 263 static int sdio_disable_wide(struct mmc_card *card)
 264 {
 265         int ret;
 266         u8 ctrl;
 267
 268         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 269                 return 0;
 270
 271         if (card->cccr.low_speed && !card->cccr.wide_bus)
 272                 return 0;
 273
 274         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 275         if (ret)
 276                 return ret;
 277
 278         if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
 279                 return 0;
 280
 281         ctrl &= ~SDIO_BUS_WIDTH_4BIT;
 282         ctrl |= SDIO_BUS_ASYNC_INT;
 283
 284         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 285         if (ret)
 286                 return ret;
 287
 288         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
 289
 290         return 0;
 291 }
 292
 293
 294 static int sdio_enable_4bit_bus(struct mmc_card *card)
 295 {
 296         int err;
 297
 298         if (card->type == MMC_TYPE_SDIO)
 299                 return sdio_enable_wide(card);
 300
 301         if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
 302                 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 303                 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 304                 if (err)
 305                         return err;
 306         } else
 307                 return 0;
 308
 309         err = sdio_enable_wide(card);
 310         if (err <= 0)
 311                 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
 312
 313         return err;
 314 }
 315
 316
 317 /*
 318  * Test if the card supports high-speed mode and, if so, switch to it.
 319  */
 320 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
 321 {
 322         int ret;
 323         u8 speed;
 324
 325         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
 326                 return 0;
 327
 328         if (!card->cccr.high_speed)
 329                 return 0;
 330
 331         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 332         if (ret)
 333                 return ret;
 334
 335         if (enable)
 336                 speed |= SDIO_SPEED_EHS;
 337         else
 338                 speed &= ~SDIO_SPEED_EHS;
 339
 340         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 341         if (ret)
 342                 return ret;
 343
 344         return 1;
 345 }
 346
 347 /*
 348  * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
 349  */
 350 static int sdio_enable_hs(struct mmc_card *card)
 351 {
 352         int ret;
 353
 354         ret = mmc_sdio_switch_hs(card, true);
 355         if (ret <= 0 || card->type == MMC_TYPE_SDIO)
 356                 return ret;
 357
 358         ret = mmc_sd_switch_hs(card);
 359         if (ret <= 0)
 360                 mmc_sdio_switch_hs(card, false);
 361
 362         return ret;
 363 }
 364
 365 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
 366 {
 367         unsigned max_dtr;
 368
 369         if (mmc_card_highspeed(card)) {
 370                 /*
 371                  * The SDIO specification doesn't mention how
 372                  * the CIS transfer speed register relates to
 373                  * high-speed, but it seems that 50 MHz is
 374                  * mandatory.
 375                  */
 376                 max_dtr = 50000000;
 377         } else {
 378                 max_dtr = card->cis.max_dtr;
 379         }
 380
 381         if (card->type == MMC_TYPE_SD_COMBO)
 382                 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
 383
 384         return max_dtr;
 385 }
 386
 387 static unsigned char host_drive_to_sdio_drive(int host_strength)
 388 {
 389         switch (host_strength) {
 390         case MMC_SET_DRIVER_TYPE_A:
 391                 return SDIO_DTSx_SET_TYPE_A;
 392         case MMC_SET_DRIVER_TYPE_B:
 393                 return SDIO_DTSx_SET_TYPE_B;
 394         case MMC_SET_DRIVER_TYPE_C:
 395                 return SDIO_DTSx_SET_TYPE_C;
 396         case MMC_SET_DRIVER_TYPE_D:
 397                 return SDIO_DTSx_SET_TYPE_D;
 398         default:
 399                 return SDIO_DTSx_SET_TYPE_B;
 400         }
 401 }
 402
 403 static void sdio_select_driver_type(struct mmc_card *card)
 404 {
 405         int host_drv_type = SD_DRIVER_TYPE_B;
 406         int card_drv_type = SD_DRIVER_TYPE_B;
 407         int drive_strength;
 408         unsigned char card_strength;
 409         int err;
 410
 411         /*
 412          * If the host doesn't support any of the Driver Types A,C or D,
 413          * or there is no board specific handler then default Driver
 414          * Type B is used.
 415          */
 416         if (!(card->host->caps &
 417                 (MMC_CAP_DRIVER_TYPE_A |
 418                  MMC_CAP_DRIVER_TYPE_C |
 419                  MMC_CAP_DRIVER_TYPE_D)))
 420                 return;
 421
 422         if (!card->host->ops->select_drive_strength)
 423                 return;
 424
 425         if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
 426                 host_drv_type |= SD_DRIVER_TYPE_A;
 427
 428         if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
 429                 host_drv_type |= SD_DRIVER_TYPE_C;
 430
 431         if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
 432                 host_drv_type |= SD_DRIVER_TYPE_D;
 433
 434         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
 435                 card_drv_type |= SD_DRIVER_TYPE_A;
 436
 437         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
 438                 card_drv_type |= SD_DRIVER_TYPE_C;
 439
 440         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
 441                 card_drv_type |= SD_DRIVER_TYPE_D;
 442
 443         /*
 444          * The drive strength that the hardware can support
 445          * depends on the board design.  Pass the appropriate
 446          * information and let the hardware specific code
 447          * return what is possible given the options
 448          */
 449         drive_strength = card->host->ops->select_drive_strength(
 450                 card->sw_caps.uhs_max_dtr,
 451                 host_drv_type, card_drv_type);
 452
 453         /* if error just use default for drive strength B */
 454         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
 455                 &card_strength);
 456         if (err)
 457                 return;
 458
 459         card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
 460         card_strength |= host_drive_to_sdio_drive(drive_strength);
 461
 462         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
 463                 card_strength, NULL);
 464
 465         /* if error default to drive strength B */
 466         if (!err)
 467                 mmc_set_driver_type(card->host, drive_strength);
 468 }
 469
 470
 471 static int sdio_set_bus_speed_mode(struct mmc_card *card)
 472 {
 473         unsigned int bus_speed, timing;
 474         int err;
 475         unsigned char speed;
 476
 477         /*
 478          * If the host doesn't support any of the UHS-I modes, fallback on
 479          * default speed.
 480          */
 481         if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
 482             MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
 483                 return 0;
 484
 485         bus_speed = SDIO_SPEED_SDR12;
 486         timing = MMC_TIMING_UHS_SDR12;
 487         if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
 488             (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
 489                         bus_speed = SDIO_SPEED_SDR104;
 490                         timing = MMC_TIMING_UHS_SDR104;
 491                         card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
 492         } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
 493                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
 494                         bus_speed = SDIO_SPEED_DDR50;
 495                         timing = MMC_TIMING_UHS_DDR50;
 496                         card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
 497         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 498                     MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
 499                     SD_MODE_UHS_SDR50)) {
 500                         bus_speed = SDIO_SPEED_SDR50;
 501                         timing = MMC_TIMING_UHS_SDR50;
 502                         card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
 503         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 504                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
 505                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
 506                         bus_speed = SDIO_SPEED_SDR25;
 507                         timing = MMC_TIMING_UHS_SDR25;
 508                         card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
 509         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 510                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
 511                     MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
 512                     SD_MODE_UHS_SDR12)) {
 513                         bus_speed = SDIO_SPEED_SDR12;
 514                         timing = MMC_TIMING_UHS_SDR12;
 515                         card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
 516         }
 517
 518         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 519         if (err)
 520                 return err;
 521
 522         speed &= ~SDIO_SPEED_BSS_MASK;
 523         speed |= bus_speed;
 524         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 525         if (err)
 526                 return err;
 527
 528         if (bus_speed) {
 529                 mmc_set_timing(card->host, timing);
 530                 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
 531         }
 532
 533         return 0;
 534 }
 535
 536 /*
 537  * UHS-I specific initialization procedure
 538  */
 539 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
 540 {
 541         int err;
 542
 543         if (!card->scr.sda_spec3)
 544                 return 0;
 545
 546         /*
 547          * Switch to wider bus (if supported).
 548          */
 549         if (card->host->caps & MMC_CAP_4_BIT_DATA) {
 550                 err = sdio_enable_4bit_bus(card);
 551                 if (err > 0) {
 552                         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 553                         err = 0;
 554                 }
 555         }
 556
 557         /* Set the driver strength for the card */
 558         sdio_select_driver_type(card);
 559
 560         /* Set bus speed mode of the card */
 561         err = sdio_set_bus_speed_mode(card);
 562         if (err)
 563                 goto out;
 564
 565         /* Initialize and start re-tuning timer */
 566         if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
 567                 err = card->host->ops->execute_tuning(card->host,
 568                                                       MMC_SEND_TUNING_BLOCK);
 569
 570 out:
 571
 572         return err;
 573 }
 574
 575 /*
 576  * Handle the detection and initialisation of a card.
 577  *
 578  * In the case of a resume, "oldcard" will contain the card
 579  * we're trying to reinitialise.
 580  */
 581 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 582                               struct mmc_card *oldcard, int powered_resume)
 583 {
 584         struct mmc_card *card;
 585         int err;
 586
 587         BUG_ON(!host);
 588         WARN_ON(!host->claimed);
 589
 590         /*
 591          * Inform the card of the voltage
 592          */
 593         if (!powered_resume) {
 594                 /* The initialization should be done at 3.3 V I/O voltage. */
 595                 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
 596
 597                 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
 598                 if (err)
 599                         goto err;
 600         }
 601
 602         /*
 603          * For SPI, enable CRC as appropriate.
 604          */
 605         if (mmc_host_is_spi(host)) {
 606                 err = mmc_spi_set_crc(host, use_spi_crc);
 607                 if (err)
 608                         goto err;
 609         }
 610
 611         /*
 612          * Allocate card structure.
 613          */
 614         card = mmc_alloc_card(host, NULL);
 615         if (IS_ERR(card)) {
 616                 err = PTR_ERR(card);
 617                 goto err;
 618         }
 619
 620         if ((ocr & R4_MEMORY_PRESENT) &&
 621             mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
 622                 card->type = MMC_TYPE_SD_COMBO;
 623
 624                 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
 625                     memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
 626                         mmc_remove_card(card);
 627                         return -ENOENT;
 628                 }
 629         } else {
 630                 card->type = MMC_TYPE_SDIO;
 631
 632                 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
 633                         mmc_remove_card(card);
 634                         return -ENOENT;
 635                 }
 636         }
 637
 638         /*
 639          * Call the optional HC's init_card function to handle quirks.
 640          */
 641         if (host->ops->init_card)
 642                 host->ops->init_card(host, card);
 643
 644         /*
 645          * If the host and card support UHS-I mode request the card
 646          * to switch to 1.8V signaling level.  No 1.8v signalling if
 647          * UHS mode is not enabled to maintain compatibilty and some
 648          * systems that claim 1.8v signalling in fact do not support
 649          * it.
 650          */
 651         if ((ocr & R4_18V_PRESENT) &&
 652                 (host->caps &
 653                         (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
 654                          MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
 655                          MMC_CAP_UHS_DDR50))) {
 656                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
 657                                 true);
 658                 if (err) {
 659                         ocr &= ~R4_18V_PRESENT;
 660                         host->ocr &= ~R4_18V_PRESENT;
 661                 }
 662                 err = 0;
 663         } else {
 664                 ocr &= ~R4_18V_PRESENT;
 665                 host->ocr &= ~R4_18V_PRESENT;
 666         }
 667
 668         /*
 669          * For native busses:  set card RCA and quit open drain mode.
 670          */
 671         if (!powered_resume && !mmc_host_is_spi(host)) {
 672                 err = mmc_send_relative_addr(host, &card->rca);
 673                 if (err)
 674                         goto remove;
 675
 676                 /*
 677                  * Update oldcard with the new RCA received from the SDIO
 678                  * device -- we're doing this so that it's updated in the
 679                  * "card" struct when oldcard overwrites that later.
 680                  */
 681                 if (oldcard)
 682                         oldcard->rca = card->rca;
 683         }
 684
 685         /*
 686          * Read CSD, before selecting the card
 687          */
 688         if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
 689                 err = mmc_sd_get_csd(host, card);
 690                 if (err)
 691                         return err;
 692
 693                 mmc_decode_cid(card);
 694         }
 695
 696         /*
 697          * Select card, as all following commands rely on that.
 698          */
 699         if (!powered_resume && !mmc_host_is_spi(host)) {
 700                 err = mmc_select_card(card);
 701                 if (err)
 702                         goto remove;
 703         }
 704
 705         if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
 706                 /*
 707                  * This is non-standard SDIO device, meaning it doesn't
 708                  * have any CIA (Common I/O area) registers present.
 709                  * It's host's responsibility to fill cccr and cis
 710                  * structures in init_card().
 711                  */
 712                 mmc_set_clock(host, card->cis.max_dtr);
 713
 714                 if (card->cccr.high_speed) {
 715                         mmc_card_set_highspeed(card);
 716                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 717                 }
 718
 719                 goto finish;
 720         }
 721
 722         /*
 723          * Read the common registers.
 724          */
 725         err = sdio_read_cccr(card, ocr);
 726         if (err)
 727                 goto remove;
 728
 729         /*
 730          * Read the common CIS tuples.
 731          */
 732         err = sdio_read_common_cis(card);
 733         if (err)
 734                 goto remove;
 735
 736         if (oldcard) {
 737                 int same = (card->cis.vendor == oldcard->cis.vendor &&
 738                             card->cis.device == oldcard->cis.device);
 739                 mmc_remove_card(card);
 740                 if (!same)
 741                         return -ENOENT;
 742
 743                 card = oldcard;
 744         }
 745         mmc_fixup_device(card, NULL);
 746
 747         if (card->type == MMC_TYPE_SD_COMBO) {
 748                 err = mmc_sd_setup_card(host, card, oldcard != NULL);
 749                 /* handle as SDIO-only card if memory init failed */
 750                 if (err) {
 751                         mmc_go_idle(host);
 752                         if (mmc_host_is_spi(host))
 753                                 /* should not fail, as it worked previously */
 754                                 mmc_spi_set_crc(host, use_spi_crc);
 755                         card->type = MMC_TYPE_SDIO;
 756                 } else
 757                         card->dev.type = &sd_type;
 758         }
 759
 760         /*
 761          * If needed, disconnect card detection pull-up resistor.
 762          */
 763         err = sdio_disable_cd(card);
 764         if (err)
 765                 goto remove;
 766
 767         /* Initialization sequence for UHS-I cards */
 768         /* Only if card supports 1.8v and UHS signaling */
 769         if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
 770                 err = mmc_sdio_init_uhs_card(card);
 771                 if (err)
 772                         goto remove;
 773
 774                 /* Card is an ultra-high-speed card */
 775                 mmc_card_set_uhs(card);
 776         } else {
 777                 /*
 778                  * Switch to high-speed (if supported).
 779                  */
 780                 err = sdio_enable_hs(card);
 781                 if (err > 0)
 782                         mmc_sd_go_highspeed(card);
 783                 else if (err)
 784                         goto remove;
 785
 786                 /*
 787                  * Change to the card's maximum speed.
 788                  */
 789                 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
 790
 791                 /*
 792                  * Switch to wider bus (if supported).
 793                  */
 794                 err = sdio_enable_4bit_bus(card);
 795                 if (err > 0)
 796                         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 797                 else if (err)
 798                         goto remove;
 799         }
 800 finish:
 801         if (!oldcard)
 802                 host->card = card;
 803         return 0;
 804
 805 remove:
 806         if (!oldcard)
 807                 mmc_remove_card(card);
 808
 809 err:
 810         return err;
 811 }
 812
 813 /*
 814  * Host is being removed. Free up the current card.
 815  */
 816 static void mmc_sdio_remove(struct mmc_host *host)
 817 {
 818         int i;
 819
 820         BUG_ON(!host);
 821         BUG_ON(!host->card);
 822
 823         for (i = 0;i < host->card->sdio_funcs;i++) {
 824                 if (host->card->sdio_func[i]) {
 825                         sdio_remove_func(host->card->sdio_func[i]);
 826                         host->card->sdio_func[i] = NULL;
 827                 }
 828         }
 829
 830         mmc_remove_card(host->card);
 831         host->card = NULL;
 832 }
 833
 834 /*
 835  * Card detection - card is alive.
 836  */
 837 static int mmc_sdio_alive(struct mmc_host *host)
 838 {
 839         return mmc_select_card(host->card);
 840 }
 841
 842 /*
 843  * Card detection callback from host.
 844  */
 845 static void mmc_sdio_detect(struct mmc_host *host)
 846 {
 847         int err;
 848
 849         BUG_ON(!host);
 850         BUG_ON(!host->card);
 851
 852         /* Make sure card is powered before detecting it */
 853         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 854                 err = pm_runtime_get_sync(&host->card->dev);
 855                 if (err < 0)
 856                         goto out;
 857         }
 858
 859         mmc_claim_host(host);
 860
 861         /*
 862          * Just check if our card has been removed.
 863          */
 864         err = _mmc_detect_card_removed(host);
 865
 866         mmc_release_host(host);
 867
 868         /*
 869          * Tell PM core it's OK to power off the card now.
 870          *
 871          * The _sync variant is used in order to ensure that the card
 872          * is left powered off in case an error occurred, and the card
 873          * is going to be removed.
 874          *
 875          * Since there is no specific reason to believe a new user
 876          * is about to show up at this point, the _sync variant is
 877          * desirable anyway.
 878          */
 879         if (host->caps & MMC_CAP_POWER_OFF_CARD)
 880                 pm_runtime_put_sync(&host->card->dev);
 881
 882 out:
 883         if (err) {
 884                 mmc_sdio_remove(host);
 885
 886                 mmc_claim_host(host);
 887                 mmc_detach_bus(host);
 888                 mmc_power_off(host);
 889                 mmc_release_host(host);
 890         }
 891 }
 892
 893 /*
 894  * SDIO suspend.  We need to suspend all functions separately.
 895  * Therefore all registered functions must have drivers with suspend
 896  * and resume methods.  Failing that we simply remove the whole card.
 897  */
 898 static int mmc_sdio_suspend(struct mmc_host *host)
 899 {
 900         int i, err = 0;
 901
 902         for (i = 0; i < host->card->sdio_funcs; i++) {
 903                 struct sdio_func *func = host->card->sdio_func[i];
 904                 if (func && sdio_func_present(func) && func->dev.driver) {
 905                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 906                         if (!pmops || !pmops->suspend || !pmops->resume) {
 907                                 /* force removal of entire card in that case */
 908                                 err = -ENOSYS;
 909                         } else
 910                                 err = pmops->suspend(&func->dev);
 911                         if (err)
 912                                 break;
 913                 }
 914         }
 915         while (err && --i >= 0) {
 916                 struct sdio_func *func = host->card->sdio_func[i];
 917                 if (func && sdio_func_present(func) && func->dev.driver) {
 918                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 919                         pmops->resume(&func->dev);
 920                 }
 921         }
 922
 923         if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 924                 mmc_claim_host(host);
 925                 sdio_disable_wide(host->card);
 926                 mmc_release_host(host);
 927         }
 928
 929         return err;
 930 }
 931
 932 static int mmc_sdio_resume(struct mmc_host *host)
 933 {
 934         int i, err = 0;
 935
 936         BUG_ON(!host);
 937         BUG_ON(!host->card);
 938
 939         /* Basic card reinitialization. */
 940         mmc_claim_host(host);
 941
 942         /* No need to reinitialize powered-resumed nonremovable cards */
 943         if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
 944                 err = mmc_sdio_init_card(host, host->ocr, host->card,
 945                                         mmc_card_keep_power(host));
 946         else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 947                 /* We may have switched to 1-bit mode during suspend */
 948                 err = sdio_enable_4bit_bus(host->card);
 949                 if (err > 0) {
 950                         mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
 951                         err = 0;
 952                 }
 953         }
 954
 955         if (!err && host->sdio_irqs)
 956                 wake_up_process(host->sdio_irq_thread);
 957         mmc_release_host(host);
 958
 959         /*
 960          * If the card looked to be the same as before suspending, then
 961          * we proceed to resume all card functions.  If one of them returns
 962          * an error then we simply return that error to the core and the
 963          * card will be redetected as new.  It is the responsibility of
 964          * the function driver to perform further tests with the extra
 965          * knowledge it has of the card to confirm the card is indeed the
 966          * same as before suspending (same MAC address for network cards,
 967          * etc.) and return an error otherwise.
 968          */
 969         for (i = 0; !err && i < host->card->sdio_funcs; i++) {
 970                 struct sdio_func *func = host->card->sdio_func[i];
 971                 if (func && sdio_func_present(func) && func->dev.driver) {
 972                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 973                         err = pmops->resume(&func->dev);
 974                 }
 975         }
 976
 977         return err;
 978 }
 979
 980 static int mmc_sdio_power_restore(struct mmc_host *host)
 981 {
 982         int ret;
 983         u32 ocr;
 984
 985         BUG_ON(!host);
 986         BUG_ON(!host->card);
 987
 988         mmc_claim_host(host);
 989
 990         /*
 991          * Reset the card by performing the same steps that are taken by
 992          * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
 993          *
 994          * sdio_reset() is technically not needed. Having just powered up the
 995          * hardware, it should already be in reset state. However, some
 996          * platforms (such as SD8686 on OLPC) do not instantly cut power,
 997          * meaning that a reset is required when restoring power soon after
 998          * powering off. It is harmless in other cases.
 999          *
1000          * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1001          * is not necessary for non-removable cards. However, it is required
1002          * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1003          * harmless in other situations.
1004          *
1005          * With these steps taken, mmc_select_voltage() is also required to
1006          * restore the correct voltage setting of the card.
1007          */
1008
1009         /* The initialization should be done at 3.3 V I/O voltage. */
1010         if (!mmc_card_keep_power(host))
1011                 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
1012
1013         sdio_reset(host);
1014         mmc_go_idle(host);
1015         mmc_send_if_cond(host, host->ocr_avail);
1016
1017         ret = mmc_send_io_op_cond(host, 0, &ocr);
1018         if (ret)
1019                 goto out;
1020
1021         if (host->ocr_avail_sdio)
1022                 host->ocr_avail = host->ocr_avail_sdio;
1023
1024         host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1025         if (!host->ocr) {
1026                 ret = -EINVAL;
1027                 goto out;
1028         }
1029
1030         ret = mmc_sdio_init_card(host, host->ocr, host->card,
1031                                 mmc_card_keep_power(host));
1032         if (!ret && host->sdio_irqs)
1033                 mmc_signal_sdio_irq(host);
1034
1035 out:
1036         mmc_release_host(host);
1037
1038         return ret;
1039 }
1040
1041 static const struct mmc_bus_ops mmc_sdio_ops = {
1042         .remove = mmc_sdio_remove,
1043         .detect = mmc_sdio_detect,
1044         .suspend = mmc_sdio_suspend,
1045         .resume = mmc_sdio_resume,
1046         .power_restore = mmc_sdio_power_restore,
1047         .alive = mmc_sdio_alive,
1048 };
1049
1050
1051 /*
1052  * Starting point for SDIO card init.
1053  */
1054 int mmc_attach_sdio(struct mmc_host *host)
1055 {
1056         int err, i, funcs;
1057         u32 ocr;
1058         struct mmc_card *card;
1059
1060         BUG_ON(!host);
1061         WARN_ON(!host->claimed);
1062
1063         err = mmc_send_io_op_cond(host, 0, &ocr);
1064         if (err)
1065                 return err;
1066
1067         mmc_attach_bus(host, &mmc_sdio_ops);
1068         if (host->ocr_avail_sdio)
1069                 host->ocr_avail = host->ocr_avail_sdio;
1070
1071         /*
1072          * Sanity check the voltages that the card claims to
1073          * support.
1074          */
1075         if (ocr & 0x7F) {
1076                 pr_warning("%s: card claims to support voltages "
1077                        "below the defined range. These will be ignored.\n",
1078                        mmc_hostname(host));
1079                 ocr &= ~0x7F;
1080         }
1081
1082         host->ocr = mmc_select_voltage(host, ocr);
1083
1084         /*
1085          * Can we support the voltage(s) of the card(s)?
1086          */
1087         if (!host->ocr) {
1088                 err = -EINVAL;
1089                 goto err;
1090         }
1091
1092         /*
1093          * Detect and init the card.
1094          */
1095         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1096         if (err) {
1097                 if (err == -EAGAIN) {
1098                         /*
1099                          * Retry initialization with S18R set to 0.
1100                          */
1101                         host->ocr &= ~R4_18V_PRESENT;
1102                         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1103                 }
1104                 if (err)
1105                         goto err;
1106         }
1107         card = host->card;
1108
1109         /*
1110          * Enable runtime PM only if supported by host+card+board
1111          */
1112         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1113                 /*
1114                  * Let runtime PM core know our card is active
1115                  */
1116                 err = pm_runtime_set_active(&card->dev);
1117                 if (err)
1118                         goto remove;
1119
1120                 /*
1121                  * Enable runtime PM for this card
1122                  */
1123                 pm_runtime_enable(&card->dev);
1124         }
1125
1126         /*
1127          * The number of functions on the card is encoded inside
1128          * the ocr.
1129          */
1130         funcs = (ocr & 0x70000000) >> 28;
1131         card->sdio_funcs = 0;
1132
1133         /*
1134          * Initialize (but don't add) all present functions.
1135          */
1136         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1137                 err = sdio_init_func(host->card, i + 1);
1138                 if (err)
1139                         goto remove;
1140
1141                 /*
1142                  * Enable Runtime PM for this func (if supported)
1143                  */
1144                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1145                         pm_runtime_enable(&card->sdio_func[i]->dev);
1146         }
1147
1148         /*
1149          * First add the card to the driver model...
1150          */
1151         mmc_release_host(host);
1152         err = mmc_add_card(host->card);
1153         if (err)
1154                 goto remove_added;
1155
1156         /*
1157          * ...then the SDIO functions.
1158          */
1159         for (i = 0;i < funcs;i++) {
1160                 err = sdio_add_func(host->card->sdio_func[i]);
1161                 if (err)
1162                         goto remove_added;
1163         }
1164
1165         mmc_claim_host(host);
1166         return 0;
1167
1168
1169 remove_added:
1170         /* Remove without lock if the device has been added. */
1171         mmc_sdio_remove(host);
1172         mmc_claim_host(host);
1173 remove:
1174         /* And with lock if it hasn't been added. */
1175         mmc_release_host(host);
1176         if (host->card)
1177                 mmc_sdio_remove(host);
1178         mmc_claim_host(host);
1179 err:
1180         mmc_detach_bus(host);
1181
1182         pr_err("%s: error %d whilst initialising SDIO card\n",
1183                 mmc_hostname(host), err);
1184
1185         return err;
1186 }
1187