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)
 102 {
 103         int ret;
 104         int cccr_vsn;
 105         unsigned char data;
 106         unsigned char speed;
 107
 108         memset(&card->cccr, 0, sizeof(struct sdio_cccr));
 109
 110         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
 111         if (ret)
 112                 goto out;
 113
 114         cccr_vsn = data & 0x0f;
 115
 116         if (cccr_vsn > SDIO_CCCR_REV_3_00) {
 117                 pr_err("%s: unrecognised CCCR structure version %d\n",
 118                         mmc_hostname(card->host), cccr_vsn);
 119                 return -EINVAL;
 120         }
 121
 122         card->cccr.sdio_vsn = (data & 0xf0) >> 4;
 123
 124         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
 125         if (ret)
 126                 goto out;
 127
 128         if (data & SDIO_CCCR_CAP_SMB)
 129                 card->cccr.multi_block = 1;
 130         if (data & SDIO_CCCR_CAP_LSC)
 131                 card->cccr.low_speed = 1;
 132         if (data & SDIO_CCCR_CAP_4BLS)
 133                 card->cccr.wide_bus = 1;
 134
 135         if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
 136                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
 137                 if (ret)
 138                         goto out;
 139
 140                 if (data & SDIO_POWER_SMPC)
 141                         card->cccr.high_power = 1;
 142         }
 143
 144         if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
 145                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 146                 if (ret)
 147                         goto out;
 148
 149                 card->scr.sda_spec3 = 0;
 150                 card->sw_caps.sd3_bus_mode = 0;
 151                 card->sw_caps.sd3_drv_type = 0;
 152                 if (cccr_vsn >= SDIO_CCCR_REV_3_00) {
 153                         card->scr.sda_spec3 = 1;
 154                         ret = mmc_io_rw_direct(card, 0, 0,
 155                                 SDIO_CCCR_UHS, 0, &data);
 156                         if (ret)
 157                                 goto out;
 158
 159                         if (card->host->caps &
 160                                 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
 161                                  MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
 162                                  MMC_CAP_UHS_DDR50)) {
 163                                 if (data & SDIO_UHS_DDR50)
 164                                         card->sw_caps.sd3_bus_mode
 165                                                 |= SD_MODE_UHS_DDR50;
 166
 167                                 if (data & SDIO_UHS_SDR50)
 168                                         card->sw_caps.sd3_bus_mode
 169                                                 |= SD_MODE_UHS_SDR50;
 170
 171                                 if (data & SDIO_UHS_SDR104)
 172                                         card->sw_caps.sd3_bus_mode
 173                                                 |= SD_MODE_UHS_SDR104;
 174                         }
 175
 176                         ret = mmc_io_rw_direct(card, 0, 0,
 177                                 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
 178                         if (ret)
 179                                 goto out;
 180
 181                         if (data & SDIO_DRIVE_SDTA)
 182                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
 183                         if (data & SDIO_DRIVE_SDTC)
 184                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
 185                         if (data & SDIO_DRIVE_SDTD)
 186                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
 187                 }
 188
 189                 /* if no uhs mode ensure we check for high speed */
 190                 if (!card->sw_caps.sd3_bus_mode) {
 191                         if (speed & SDIO_SPEED_SHS) {
 192                                 card->cccr.high_speed = 1;
 193                                 card->sw_caps.hs_max_dtr = 50000000;
 194                         } else {
 195                                 card->cccr.high_speed = 0;
 196                                 card->sw_caps.hs_max_dtr = 25000000;
 197                         }
 198                 }
 199         }
 200
 201 out:
 202         return ret;
 203 }
 204
 205 static int sdio_enable_wide(struct mmc_card *card)
 206 {
 207         int ret;
 208         u8 ctrl;
 209
 210         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 211                 return 0;
 212
 213         if (card->cccr.low_speed && !card->cccr.wide_bus)
 214                 return 0;
 215
 216         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 217         if (ret)
 218                 return ret;
 219
 220         ctrl |= SDIO_BUS_WIDTH_4BIT;
 221
 222         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 223         if (ret)
 224                 return ret;
 225
 226         return 1;
 227 }
 228
 229 /*
 230  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
 231  * of the card. This may be required on certain setups of boards,
 232  * controllers and embedded sdio device which do not need the card's
 233  * pull-up. As a result, card detection is disabled and power is saved.
 234  */
 235 static int sdio_disable_cd(struct mmc_card *card)
 236 {
 237         int ret;
 238         u8 ctrl;
 239
 240         if (!mmc_card_disable_cd(card))
 241                 return 0;
 242
 243         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 244         if (ret)
 245                 return ret;
 246
 247         ctrl |= SDIO_BUS_CD_DISABLE;
 248
 249         return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 250 }
 251
 252 /*
 253  * Devices that remain active during a system suspend are
 254  * put back into 1-bit mode.
 255  */
 256 static int sdio_disable_wide(struct mmc_card *card)
 257 {
 258         int ret;
 259         u8 ctrl;
 260
 261         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 262                 return 0;
 263
 264         if (card->cccr.low_speed && !card->cccr.wide_bus)
 265                 return 0;
 266
 267         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 268         if (ret)
 269                 return ret;
 270
 271         if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
 272                 return 0;
 273
 274         ctrl &= ~SDIO_BUS_WIDTH_4BIT;
 275         ctrl |= SDIO_BUS_ASYNC_INT;
 276
 277         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 278         if (ret)
 279                 return ret;
 280
 281         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
 282
 283         return 0;
 284 }
 285
 286
 287 static int sdio_enable_4bit_bus(struct mmc_card *card)
 288 {
 289         int err;
 290
 291         if (card->type == MMC_TYPE_SDIO)
 292                 return sdio_enable_wide(card);
 293
 294         if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
 295                 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 296                 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 297                 if (err)
 298                         return err;
 299         } else
 300                 return 0;
 301
 302         err = sdio_enable_wide(card);
 303         if (err <= 0)
 304                 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
 305
 306         return err;
 307 }
 308
 309
 310 /*
 311  * Test if the card supports high-speed mode and, if so, switch to it.
 312  */
 313 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
 314 {
 315         int ret;
 316         u8 speed;
 317
 318         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
 319                 return 0;
 320
 321         if (!card->cccr.high_speed)
 322                 return 0;
 323
 324         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 325         if (ret)
 326                 return ret;
 327
 328         if (enable)
 329                 speed |= SDIO_SPEED_EHS;
 330         else
 331                 speed &= ~SDIO_SPEED_EHS;
 332
 333         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 334         if (ret)
 335                 return ret;
 336
 337         return 1;
 338 }
 339
 340 /*
 341  * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
 342  */
 343 static int sdio_enable_hs(struct mmc_card *card)
 344 {
 345         int ret;
 346
 347         ret = mmc_sdio_switch_hs(card, true);
 348         if (ret <= 0 || card->type == MMC_TYPE_SDIO)
 349                 return ret;
 350
 351         ret = mmc_sd_switch_hs(card);
 352         if (ret <= 0)
 353                 mmc_sdio_switch_hs(card, false);
 354
 355         return ret;
 356 }
 357
 358 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
 359 {
 360         unsigned max_dtr;
 361
 362         if (mmc_card_highspeed(card)) {
 363                 /*
 364                  * The SDIO specification doesn't mention how
 365                  * the CIS transfer speed register relates to
 366                  * high-speed, but it seems that 50 MHz is
 367                  * mandatory.
 368                  */
 369                 max_dtr = 50000000;
 370         } else {
 371                 max_dtr = card->cis.max_dtr;
 372         }
 373
 374         if (card->type == MMC_TYPE_SD_COMBO)
 375                 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
 376
 377         return max_dtr;
 378 }
 379
 380 static unsigned char host_drive_to_sdio_drive(int host_strength)
 381 {
 382         switch (host_strength) {
 383         case MMC_SET_DRIVER_TYPE_A:
 384                 return SDIO_DTSx_SET_TYPE_A;
 385         case MMC_SET_DRIVER_TYPE_B:
 386                 return SDIO_DTSx_SET_TYPE_B;
 387         case MMC_SET_DRIVER_TYPE_C:
 388                 return SDIO_DTSx_SET_TYPE_C;
 389         case MMC_SET_DRIVER_TYPE_D:
 390                 return SDIO_DTSx_SET_TYPE_D;
 391         default:
 392                 return SDIO_DTSx_SET_TYPE_B;
 393         }
 394 }
 395
 396 static void sdio_select_driver_type(struct mmc_card *card)
 397 {
 398         int host_drv_type = SD_DRIVER_TYPE_B;
 399         int card_drv_type = SD_DRIVER_TYPE_B;
 400         int drive_strength;
 401         unsigned char card_strength;
 402         int err;
 403
 404         /*
 405          * If the host doesn't support any of the Driver Types A,C or D,
 406          * or there is no board specific handler then default Driver
 407          * Type B is used.
 408          */
 409         if (!(card->host->caps &
 410                 (MMC_CAP_DRIVER_TYPE_A |
 411                  MMC_CAP_DRIVER_TYPE_C |
 412                  MMC_CAP_DRIVER_TYPE_D)))
 413                 return;
 414
 415         if (!card->host->ops->select_drive_strength)
 416                 return;
 417
 418         if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
 419                 host_drv_type |= SD_DRIVER_TYPE_A;
 420
 421         if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
 422                 host_drv_type |= SD_DRIVER_TYPE_C;
 423
 424         if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
 425                 host_drv_type |= SD_DRIVER_TYPE_D;
 426
 427         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
 428                 card_drv_type |= SD_DRIVER_TYPE_A;
 429
 430         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
 431                 card_drv_type |= SD_DRIVER_TYPE_C;
 432
 433         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
 434                 card_drv_type |= SD_DRIVER_TYPE_D;
 435
 436         /*
 437          * The drive strength that the hardware can support
 438          * depends on the board design.  Pass the appropriate
 439          * information and let the hardware specific code
 440          * return what is possible given the options
 441          */
 442         drive_strength = card->host->ops->select_drive_strength(
 443                 card->sw_caps.uhs_max_dtr,
 444                 host_drv_type, card_drv_type);
 445
 446         /* if error just use default for drive strength B */
 447         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
 448                 &card_strength);
 449         if (err)
 450                 return;
 451
 452         card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
 453         card_strength |= host_drive_to_sdio_drive(drive_strength);
 454
 455         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
 456                 card_strength, NULL);
 457
 458         /* if error default to drive strength B */
 459         if (!err)
 460                 mmc_set_driver_type(card->host, drive_strength);
 461 }
 462
 463
 464 static int sdio_set_bus_speed_mode(struct mmc_card *card)
 465 {
 466         unsigned int bus_speed, timing;
 467         int err;
 468         unsigned char speed;
 469
 470         /*
 471          * If the host doesn't support any of the UHS-I modes, fallback on
 472          * default speed.
 473          */
 474         if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
 475             MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
 476                 return 0;
 477
 478         bus_speed = SDIO_SPEED_SDR12;
 479         timing = MMC_TIMING_UHS_SDR12;
 480         if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
 481             (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
 482                         bus_speed = SDIO_SPEED_SDR104;
 483                         timing = MMC_TIMING_UHS_SDR104;
 484                         card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
 485         } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
 486                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
 487                         bus_speed = SDIO_SPEED_DDR50;
 488                         timing = MMC_TIMING_UHS_DDR50;
 489                         card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
 490         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 491                     MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
 492                     SD_MODE_UHS_SDR50)) {
 493                         bus_speed = SDIO_SPEED_SDR50;
 494                         timing = MMC_TIMING_UHS_SDR50;
 495                         card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
 496         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 497                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
 498                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
 499                         bus_speed = SDIO_SPEED_SDR25;
 500                         timing = MMC_TIMING_UHS_SDR25;
 501                         card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
 502         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 503                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
 504                     MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
 505                     SD_MODE_UHS_SDR12)) {
 506                         bus_speed = SDIO_SPEED_SDR12;
 507                         timing = MMC_TIMING_UHS_SDR12;
 508                         card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
 509         }
 510
 511         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 512         if (err)
 513                 return err;
 514
 515         speed &= ~SDIO_SPEED_BSS_MASK;
 516         speed |= bus_speed;
 517         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 518         if (err)
 519                 return err;
 520
 521         if (bus_speed) {
 522                 mmc_set_timing(card->host, timing);
 523                 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
 524         }
 525
 526         return 0;
 527 }
 528
 529 /*
 530  * UHS-I specific initialization procedure
 531  */
 532 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
 533 {
 534         int err;
 535
 536         if (!card->scr.sda_spec3)
 537                 return 0;
 538
 539         /*
 540          * Switch to wider bus (if supported).
 541          */
 542         if (card->host->caps & MMC_CAP_4_BIT_DATA) {
 543                 err = sdio_enable_4bit_bus(card);
 544                 if (err > 0) {
 545                         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 546                         err = 0;
 547                 }
 548         }
 549
 550         /* Set the driver strength for the card */
 551         sdio_select_driver_type(card);
 552
 553         /* Set bus speed mode of the card */
 554         err = sdio_set_bus_speed_mode(card);
 555         if (err)
 556                 goto out;
 557
 558         /* Initialize and start re-tuning timer */
 559         if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
 560                 err = card->host->ops->execute_tuning(card->host,
 561                                                       MMC_SEND_TUNING_BLOCK);
 562
 563 out:
 564
 565         return err;
 566 }
 567
 568 /*
 569  * Handle the detection and initialisation of a card.
 570  *
 571  * In the case of a resume, "oldcard" will contain the card
 572  * we're trying to reinitialise.
 573  */
 574 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 575                               struct mmc_card *oldcard, int powered_resume)
 576 {
 577         struct mmc_card *card;
 578         int err;
 579
 580         BUG_ON(!host);
 581         WARN_ON(!host->claimed);
 582
 583         /*
 584          * Inform the card of the voltage
 585          */
 586         if (!powered_resume) {
 587                 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
 588                 if (err)
 589                         goto err;
 590         }
 591
 592         /*
 593          * For SPI, enable CRC as appropriate.
 594          */
 595         if (mmc_host_is_spi(host)) {
 596                 err = mmc_spi_set_crc(host, use_spi_crc);
 597                 if (err)
 598                         goto err;
 599         }
 600
 601         /*
 602          * Allocate card structure.
 603          */
 604         card = mmc_alloc_card(host, NULL);
 605         if (IS_ERR(card)) {
 606                 err = PTR_ERR(card);
 607                 goto err;
 608         }
 609
 610         if ((ocr & R4_MEMORY_PRESENT) &&
 611             mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
 612                 card->type = MMC_TYPE_SD_COMBO;
 613
 614                 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
 615                     memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
 616                         mmc_remove_card(card);
 617                         return -ENOENT;
 618                 }
 619         } else {
 620                 card->type = MMC_TYPE_SDIO;
 621
 622                 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
 623                         mmc_remove_card(card);
 624                         return -ENOENT;
 625                 }
 626         }
 627
 628         /*
 629          * Call the optional HC's init_card function to handle quirks.
 630          */
 631         if (host->ops->init_card)
 632                 host->ops->init_card(host, card);
 633
 634         /*
 635          * If the host and card support UHS-I mode request the card
 636          * to switch to 1.8V signaling level.  No 1.8v signalling if
 637          * UHS mode is not enabled to maintain compatibilty and some
 638          * systems that claim 1.8v signalling in fact do not support
 639          * it.
 640          */
 641         if ((ocr & R4_18V_PRESENT) &&
 642                 (host->caps &
 643                         (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
 644                          MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
 645                          MMC_CAP_UHS_DDR50))) {
 646                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
 647                                 true);
 648                 if (err) {
 649                         ocr &= ~R4_18V_PRESENT;
 650                         host->ocr &= ~R4_18V_PRESENT;
 651                 }
 652                 err = 0;
 653         } else {
 654                 ocr &= ~R4_18V_PRESENT;
 655                 host->ocr &= ~R4_18V_PRESENT;
 656         }
 657
 658         /*
 659          * For native busses:  set card RCA and quit open drain mode.
 660          */
 661         if (!powered_resume && !mmc_host_is_spi(host)) {
 662                 err = mmc_send_relative_addr(host, &card->rca);
 663                 if (err)
 664                         goto remove;
 665
 666                 /*
 667                  * Update oldcard with the new RCA received from the SDIO
 668                  * device -- we're doing this so that it's updated in the
 669                  * "card" struct when oldcard overwrites that later.
 670                  */
 671                 if (oldcard)
 672                         oldcard->rca = card->rca;
 673         }
 674
 675         /*
 676          * Read CSD, before selecting the card
 677          */
 678         if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
 679                 err = mmc_sd_get_csd(host, card);
 680                 if (err)
 681                         return err;
 682
 683                 mmc_decode_cid(card);
 684         }
 685
 686         /*
 687          * Select card, as all following commands rely on that.
 688          */
 689         if (!powered_resume && !mmc_host_is_spi(host)) {
 690                 err = mmc_select_card(card);
 691                 if (err)
 692                         goto remove;
 693         }
 694
 695         if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
 696                 /*
 697                  * This is non-standard SDIO device, meaning it doesn't
 698                  * have any CIA (Common I/O area) registers present.
 699                  * It's host's responsibility to fill cccr and cis
 700                  * structures in init_card().
 701                  */
 702                 mmc_set_clock(host, card->cis.max_dtr);
 703
 704                 if (card->cccr.high_speed) {
 705                         mmc_card_set_highspeed(card);
 706                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 707                 }
 708
 709                 goto finish;
 710         }
 711
 712         /*
 713          * Read the common registers.
 714          */
 715         err = sdio_read_cccr(card);
 716         if (err)
 717                 goto remove;
 718
 719         /*
 720          * Read the common CIS tuples.
 721          */
 722         err = sdio_read_common_cis(card);
 723         if (err)
 724                 goto remove;
 725
 726         if (oldcard) {
 727                 int same = (card->cis.vendor == oldcard->cis.vendor &&
 728                             card->cis.device == oldcard->cis.device);
 729                 mmc_remove_card(card);
 730                 if (!same)
 731                         return -ENOENT;
 732
 733                 card = oldcard;
 734         }
 735         mmc_fixup_device(card, NULL);
 736
 737         if (card->type == MMC_TYPE_SD_COMBO) {
 738                 err = mmc_sd_setup_card(host, card, oldcard != NULL);
 739                 /* handle as SDIO-only card if memory init failed */
 740                 if (err) {
 741                         mmc_go_idle(host);
 742                         if (mmc_host_is_spi(host))
 743                                 /* should not fail, as it worked previously */
 744                                 mmc_spi_set_crc(host, use_spi_crc);
 745                         card->type = MMC_TYPE_SDIO;
 746                 } else
 747                         card->dev.type = &sd_type;
 748         }
 749
 750         /*
 751          * If needed, disconnect card detection pull-up resistor.
 752          */
 753         err = sdio_disable_cd(card);
 754         if (err)
 755                 goto remove;
 756
 757         /* Initialization sequence for UHS-I cards */
 758         /* Only if card supports 1.8v and UHS signaling */
 759         if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
 760                 err = mmc_sdio_init_uhs_card(card);
 761                 if (err)
 762                         goto remove;
 763
 764                 /* Card is an ultra-high-speed card */
 765                 mmc_card_set_uhs(card);
 766         } else {
 767                 /*
 768                  * Switch to high-speed (if supported).
 769                  */
 770                 err = sdio_enable_hs(card);
 771                 if (err > 0)
 772                         mmc_sd_go_highspeed(card);
 773                 else if (err)
 774                         goto remove;
 775
 776                 /*
 777                  * Change to the card's maximum speed.
 778                  */
 779                 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
 780
 781                 /*
 782                  * Switch to wider bus (if supported).
 783                  */
 784                 err = sdio_enable_4bit_bus(card);
 785                 if (err > 0)
 786                         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 787                 else if (err)
 788                         goto remove;
 789         }
 790 finish:
 791         if (!oldcard)
 792                 host->card = card;
 793         return 0;
 794
 795 remove:
 796         if (!oldcard)
 797                 mmc_remove_card(card);
 798
 799 err:
 800         return err;
 801 }
 802
 803 /*
 804  * Host is being removed. Free up the current card.
 805  */
 806 static void mmc_sdio_remove(struct mmc_host *host)
 807 {
 808         int i;
 809
 810         BUG_ON(!host);
 811         BUG_ON(!host->card);
 812
 813         for (i = 0;i < host->card->sdio_funcs;i++) {
 814                 if (host->card->sdio_func[i]) {
 815                         sdio_remove_func(host->card->sdio_func[i]);
 816                         host->card->sdio_func[i] = NULL;
 817                 }
 818         }
 819
 820         mmc_remove_card(host->card);
 821         host->card = NULL;
 822 }
 823
 824 /*
 825  * Card detection - card is alive.
 826  */
 827 static int mmc_sdio_alive(struct mmc_host *host)
 828 {
 829         return mmc_select_card(host->card);
 830 }
 831
 832 /*
 833  * Card detection callback from host.
 834  */
 835 static void mmc_sdio_detect(struct mmc_host *host)
 836 {
 837         int err;
 838
 839         BUG_ON(!host);
 840         BUG_ON(!host->card);
 841
 842         /* Make sure card is powered before detecting it */
 843         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 844                 err = pm_runtime_get_sync(&host->card->dev);
 845                 if (err < 0)
 846                         goto out;
 847         }
 848
 849         mmc_claim_host(host);
 850
 851         /*
 852          * Just check if our card has been removed.
 853          */
 854         err = _mmc_detect_card_removed(host);
 855
 856         mmc_release_host(host);
 857
 858         /*
 859          * Tell PM core it's OK to power off the card now.
 860          *
 861          * The _sync variant is used in order to ensure that the card
 862          * is left powered off in case an error occurred, and the card
 863          * is going to be removed.
 864          *
 865          * Since there is no specific reason to believe a new user
 866          * is about to show up at this point, the _sync variant is
 867          * desirable anyway.
 868          */
 869         if (host->caps & MMC_CAP_POWER_OFF_CARD)
 870                 pm_runtime_put_sync(&host->card->dev);
 871
 872 out:
 873         if (err) {
 874                 mmc_sdio_remove(host);
 875
 876                 mmc_claim_host(host);
 877                 mmc_detach_bus(host);
 878                 mmc_power_off(host);
 879                 mmc_release_host(host);
 880         }
 881 }
 882
 883 /*
 884  * SDIO suspend.  We need to suspend all functions separately.
 885  * Therefore all registered functions must have drivers with suspend
 886  * and resume methods.  Failing that we simply remove the whole card.
 887  */
 888 static int mmc_sdio_suspend(struct mmc_host *host)
 889 {
 890         int i, err = 0;
 891
 892         for (i = 0; i < host->card->sdio_funcs; i++) {
 893                 struct sdio_func *func = host->card->sdio_func[i];
 894                 if (func && sdio_func_present(func) && func->dev.driver) {
 895                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 896                         if (!pmops || !pmops->suspend || !pmops->resume) {
 897                                 /* force removal of entire card in that case */
 898                                 err = -ENOSYS;
 899                         } else
 900                                 err = pmops->suspend(&func->dev);
 901                         if (err)
 902                                 break;
 903                 }
 904         }
 905         while (err && --i >= 0) {
 906                 struct sdio_func *func = host->card->sdio_func[i];
 907                 if (func && sdio_func_present(func) && func->dev.driver) {
 908                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 909                         pmops->resume(&func->dev);
 910                 }
 911         }
 912
 913         if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 914                 mmc_claim_host(host);
 915                 sdio_disable_wide(host->card);
 916                 mmc_release_host(host);
 917         }
 918
 919         return err;
 920 }
 921
 922 static int mmc_sdio_resume(struct mmc_host *host)
 923 {
 924         int i, err = 0;
 925
 926         BUG_ON(!host);
 927         BUG_ON(!host->card);
 928
 929         /* Basic card reinitialization. */
 930         mmc_claim_host(host);
 931
 932         /* No need to reinitialize powered-resumed nonremovable cards */
 933         if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
 934                 err = mmc_sdio_init_card(host, host->ocr, host->card,
 935                                         mmc_card_keep_power(host));
 936         else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 937                 /* We may have switched to 1-bit mode during suspend */
 938                 err = sdio_enable_4bit_bus(host->card);
 939                 if (err > 0) {
 940                         mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
 941                         err = 0;
 942                 }
 943         }
 944
 945         if (!err && host->sdio_irqs)
 946                 mmc_signal_sdio_irq(host);
 947         mmc_release_host(host);
 948
 949         /*
 950          * If the card looked to be the same as before suspending, then
 951          * we proceed to resume all card functions.  If one of them returns
 952          * an error then we simply return that error to the core and the
 953          * card will be redetected as new.  It is the responsibility of
 954          * the function driver to perform further tests with the extra
 955          * knowledge it has of the card to confirm the card is indeed the
 956          * same as before suspending (same MAC address for network cards,
 957          * etc.) and return an error otherwise.
 958          */
 959         for (i = 0; !err && i < host->card->sdio_funcs; i++) {
 960                 struct sdio_func *func = host->card->sdio_func[i];
 961                 if (func && sdio_func_present(func) && func->dev.driver) {
 962                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 963                         err = pmops->resume(&func->dev);
 964                 }
 965         }
 966
 967         return err;
 968 }
 969
 970 static int mmc_sdio_power_restore(struct mmc_host *host)
 971 {
 972         int ret;
 973         u32 ocr;
 974
 975         BUG_ON(!host);
 976         BUG_ON(!host->card);
 977
 978         mmc_claim_host(host);
 979
 980         /*
 981          * Reset the card by performing the same steps that are taken by
 982          * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
 983          *
 984          * sdio_reset() is technically not needed. Having just powered up the
 985          * hardware, it should already be in reset state. However, some
 986          * platforms (such as SD8686 on OLPC) do not instantly cut power,
 987          * meaning that a reset is required when restoring power soon after
 988          * powering off. It is harmless in other cases.
 989          *
 990          * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
 991          * is not necessary for non-removable cards. However, it is required
 992          * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
 993          * harmless in other situations.
 994          *
 995          * With these steps taken, mmc_select_voltage() is also required to
 996          * restore the correct voltage setting of the card.
 997          */
 998         sdio_reset(host);
 999         mmc_go_idle(host);
1000         mmc_send_if_cond(host, host->ocr_avail);
1001
1002         ret = mmc_send_io_op_cond(host, 0, &ocr);
1003         if (ret)
1004                 goto out;
1005
1006         if (host->ocr_avail_sdio)
1007                 host->ocr_avail = host->ocr_avail_sdio;
1008
1009         host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1010         if (!host->ocr) {
1011                 ret = -EINVAL;
1012                 goto out;
1013         }
1014
1015         ret = mmc_sdio_init_card(host, host->ocr, host->card,
1016                                 mmc_card_keep_power(host));
1017         if (!ret && host->sdio_irqs)
1018                 mmc_signal_sdio_irq(host);
1019
1020 out:
1021         mmc_release_host(host);
1022
1023         return ret;
1024 }
1025
1026 static const struct mmc_bus_ops mmc_sdio_ops = {
1027         .remove = mmc_sdio_remove,
1028         .detect = mmc_sdio_detect,
1029         .suspend = mmc_sdio_suspend,
1030         .resume = mmc_sdio_resume,
1031         .power_restore = mmc_sdio_power_restore,
1032         .alive = mmc_sdio_alive,
1033 };
1034
1035
1036 /*
1037  * Starting point for SDIO card init.
1038  */
1039 int mmc_attach_sdio(struct mmc_host *host)
1040 {
1041         int err, i, funcs;
1042         u32 ocr;
1043         struct mmc_card *card;
1044
1045         BUG_ON(!host);
1046         WARN_ON(!host->claimed);
1047
1048         err = mmc_send_io_op_cond(host, 0, &ocr);
1049         if (err)
1050                 return err;
1051
1052         mmc_attach_bus(host, &mmc_sdio_ops);
1053         if (host->ocr_avail_sdio)
1054                 host->ocr_avail = host->ocr_avail_sdio;
1055
1056         /*
1057          * Sanity check the voltages that the card claims to
1058          * support.
1059          */
1060         if (ocr & 0x7F) {
1061                 pr_warning("%s: card claims to support voltages "
1062                        "below the defined range. These will be ignored.\n",
1063                        mmc_hostname(host));
1064                 ocr &= ~0x7F;
1065         }
1066
1067         host->ocr = mmc_select_voltage(host, ocr);
1068
1069         /*
1070          * Can we support the voltage(s) of the card(s)?
1071          */
1072         if (!host->ocr) {
1073                 err = -EINVAL;
1074                 goto err;
1075         }
1076
1077         /*
1078          * Detect and init the card.
1079          */
1080         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1081         if (err) {
1082                 if (err == -EAGAIN) {
1083                         /*
1084                          * Retry initialization with S18R set to 0.
1085                          */
1086                         host->ocr &= ~R4_18V_PRESENT;
1087                         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1088                 }
1089                 if (err)
1090                         goto err;
1091         }
1092         card = host->card;
1093
1094         /*
1095          * Enable runtime PM only if supported by host+card+board
1096          */
1097         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1098                 /*
1099                  * Let runtime PM core know our card is active
1100                  */
1101                 err = pm_runtime_set_active(&card->dev);
1102                 if (err)
1103                         goto remove;
1104
1105                 /*
1106                  * Enable runtime PM for this card
1107                  */
1108                 pm_runtime_enable(&card->dev);
1109         }
1110
1111         /*
1112          * The number of functions on the card is encoded inside
1113          * the ocr.
1114          */
1115         funcs = (ocr & 0x70000000) >> 28;
1116         card->sdio_funcs = 0;
1117
1118         /*
1119          * Initialize (but don't add) all present functions.
1120          */
1121         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1122                 err = sdio_init_func(host->card, i + 1);
1123                 if (err)
1124                         goto remove;
1125
1126                 /*
1127                  * Enable Runtime PM for this func (if supported)
1128                  */
1129                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1130                         pm_runtime_enable(&card->sdio_func[i]->dev);
1131         }
1132
1133         /*
1134          * First add the card to the driver model...
1135          */
1136         mmc_release_host(host);
1137         err = mmc_add_card(host->card);
1138         if (err)
1139                 goto remove_added;
1140
1141         /*
1142          * ...then the SDIO functions.
1143          */
1144         for (i = 0;i < funcs;i++) {
1145                 err = sdio_add_func(host->card->sdio_func[i]);
1146                 if (err)
1147                         goto remove_added;
1148         }
1149
1150         mmc_claim_host(host);
1151         return 0;
1152
1153
1154 remove_added:
1155         /* Remove without lock if the device has been added. */
1156         mmc_sdio_remove(host);
1157         mmc_claim_host(host);
1158 remove:
1159         /* And with lock if it hasn't been added. */
1160         mmc_release_host(host);
1161         if (host->card)
1162                 mmc_sdio_remove(host);
1163         mmc_claim_host(host);
1164 err:
1165         mmc_detach_bus(host);
1166
1167         pr_err("%s: error %d whilst initialising SDIO card\n",
1168                 mmc_hostname(host), err);
1169
1170         return err;
1171 }
1172