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         if (WARN_ON(fn > SDIO_MAX_FUNCS))
  67                 return -EINVAL;
  68
  69         func = sdio_alloc_func(card);
  70         if (IS_ERR(func))
  71                 return PTR_ERR(func);
  72
  73         func->num = fn;
  74
  75         if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
  76                 ret = sdio_read_fbr(func);
  77                 if (ret)
  78                         goto fail;
  79
  80                 ret = sdio_read_func_cis(func);
  81                 if (ret)
  82                         goto fail;
  83         } else {
  84                 func->vendor = func->card->cis.vendor;
  85                 func->device = func->card->cis.device;
  86                 func->max_blksize = func->card->cis.blksize;
  87         }
  88
  89         card->sdio_func[fn - 1] = func;
  90
  91         return 0;
  92
  93 fail:
  94         /*
  95          * It is okay to remove the function here even though we hold
  96          * the host lock as we haven't registered the device yet.
  97          */
  98         sdio_remove_func(func);
  99         return ret;
 100 }
 101
 102 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
 103 {
 104         int ret;
 105         int cccr_vsn;
 106         int uhs = ocr & R4_18V_PRESENT;
 107         unsigned char data;
 108         unsigned char speed;
 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 && uhs) {
 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 (mmc_host_uhs(card->host)) {
 160                                 if (data & SDIO_UHS_DDR50)
 161                                         card->sw_caps.sd3_bus_mode
 162                                                 |= SD_MODE_UHS_DDR50;
 163
 164                                 if (data & SDIO_UHS_SDR50)
 165                                         card->sw_caps.sd3_bus_mode
 166                                                 |= SD_MODE_UHS_SDR50;
 167
 168                                 if (data & SDIO_UHS_SDR104)
 169                                         card->sw_caps.sd3_bus_mode
 170                                                 |= SD_MODE_UHS_SDR104;
 171                         }
 172
 173                         ret = mmc_io_rw_direct(card, 0, 0,
 174                                 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
 175                         if (ret)
 176                                 goto out;
 177
 178                         if (data & SDIO_DRIVE_SDTA)
 179                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
 180                         if (data & SDIO_DRIVE_SDTC)
 181                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
 182                         if (data & SDIO_DRIVE_SDTD)
 183                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
 184                 }
 185
 186                 /* if no uhs mode ensure we check for high speed */
 187                 if (!card->sw_caps.sd3_bus_mode) {
 188                         if (speed & SDIO_SPEED_SHS) {
 189                                 card->cccr.high_speed = 1;
 190                                 card->sw_caps.hs_max_dtr = 50000000;
 191                         } else {
 192                                 card->cccr.high_speed = 0;
 193                                 card->sw_caps.hs_max_dtr = 25000000;
 194                         }
 195                 }
 196         }
 197
 198 out:
 199         return ret;
 200 }
 201
 202 static int sdio_enable_wide(struct mmc_card *card)
 203 {
 204         int ret;
 205         u8 ctrl;
 206
 207         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 208                 return 0;
 209
 210         if (card->cccr.low_speed && !card->cccr.wide_bus)
 211                 return 0;
 212
 213         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 214         if (ret)
 215                 return ret;
 216
 217         if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
 218                 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
 219                         mmc_hostname(card->host), ctrl);
 220
 221         /* set as 4-bit bus width */
 222         ctrl &= ~SDIO_BUS_WIDTH_MASK;
 223         ctrl |= SDIO_BUS_WIDTH_4BIT;
 224
 225         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 226         if (ret)
 227                 return ret;
 228
 229         return 1;
 230 }
 231
 232 /*
 233  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
 234  * of the card. This may be required on certain setups of boards,
 235  * controllers and embedded sdio device which do not need the card's
 236  * pull-up. As a result, card detection is disabled and power is saved.
 237  */
 238 static int sdio_disable_cd(struct mmc_card *card)
 239 {
 240         int ret;
 241         u8 ctrl;
 242
 243         if (!mmc_card_disable_cd(card))
 244                 return 0;
 245
 246         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 247         if (ret)
 248                 return ret;
 249
 250         ctrl |= SDIO_BUS_CD_DISABLE;
 251
 252         return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 253 }
 254
 255 /*
 256  * Devices that remain active during a system suspend are
 257  * put back into 1-bit mode.
 258  */
 259 static int sdio_disable_wide(struct mmc_card *card)
 260 {
 261         int ret;
 262         u8 ctrl;
 263
 264         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 265                 return 0;
 266
 267         if (card->cccr.low_speed && !card->cccr.wide_bus)
 268                 return 0;
 269
 270         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 271         if (ret)
 272                 return ret;
 273
 274         if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
 275                 return 0;
 276
 277         ctrl &= ~SDIO_BUS_WIDTH_4BIT;
 278         ctrl |= SDIO_BUS_ASYNC_INT;
 279
 280         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 281         if (ret)
 282                 return ret;
 283
 284         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
 285
 286         return 0;
 287 }
 288
 289
 290 static int sdio_enable_4bit_bus(struct mmc_card *card)
 291 {
 292         int err;
 293
 294         if (card->type == MMC_TYPE_SDIO)
 295                 err = sdio_enable_wide(card);
 296         else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
 297                  (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 298                 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 299                 if (err)
 300                         return err;
 301                 err = sdio_enable_wide(card);
 302                 if (err <= 0)
 303                         mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
 304         } else
 305                 return 0;
 306
 307         if (err > 0) {
 308                 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 309                 err = 0;
 310         }
 311
 312         return err;
 313 }
 314
 315
 316 /*
 317  * Test if the card supports high-speed mode and, if so, switch to it.
 318  */
 319 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
 320 {
 321         int ret;
 322         u8 speed;
 323
 324         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
 325                 return 0;
 326
 327         if (!card->cccr.high_speed)
 328                 return 0;
 329
 330         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 331         if (ret)
 332                 return ret;
 333
 334         if (enable)
 335                 speed |= SDIO_SPEED_EHS;
 336         else
 337                 speed &= ~SDIO_SPEED_EHS;
 338
 339         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 340         if (ret)
 341                 return ret;
 342
 343         return 1;
 344 }
 345
 346 /*
 347  * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
 348  */
 349 static int sdio_enable_hs(struct mmc_card *card)
 350 {
 351         int ret;
 352
 353         ret = mmc_sdio_switch_hs(card, true);
 354         if (ret <= 0 || card->type == MMC_TYPE_SDIO)
 355                 return ret;
 356
 357         ret = mmc_sd_switch_hs(card);
 358         if (ret <= 0)
 359                 mmc_sdio_switch_hs(card, false);
 360
 361         return ret;
 362 }
 363
 364 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
 365 {
 366         unsigned max_dtr;
 367
 368         if (mmc_card_hs(card)) {
 369                 /*
 370                  * The SDIO specification doesn't mention how
 371                  * the CIS transfer speed register relates to
 372                  * high-speed, but it seems that 50 MHz is
 373                  * mandatory.
 374                  */
 375                 max_dtr = 50000000;
 376         } else {
 377                 max_dtr = card->cis.max_dtr;
 378         }
 379
 380         if (card->type == MMC_TYPE_SD_COMBO)
 381                 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
 382
 383         return max_dtr;
 384 }
 385
 386 static unsigned char host_drive_to_sdio_drive(int host_strength)
 387 {
 388         switch (host_strength) {
 389         case MMC_SET_DRIVER_TYPE_A:
 390                 return SDIO_DTSx_SET_TYPE_A;
 391         case MMC_SET_DRIVER_TYPE_B:
 392                 return SDIO_DTSx_SET_TYPE_B;
 393         case MMC_SET_DRIVER_TYPE_C:
 394                 return SDIO_DTSx_SET_TYPE_C;
 395         case MMC_SET_DRIVER_TYPE_D:
 396                 return SDIO_DTSx_SET_TYPE_D;
 397         default:
 398                 return SDIO_DTSx_SET_TYPE_B;
 399         }
 400 }
 401
 402 static void sdio_select_driver_type(struct mmc_card *card)
 403 {
 404         int card_drv_type, drive_strength, drv_type;
 405         unsigned char card_strength;
 406         int err;
 407
 408         card->drive_strength = 0;
 409
 410         card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
 411
 412         drive_strength = mmc_select_drive_strength(card,
 413                                                    card->sw_caps.uhs_max_dtr,
 414                                                    card_drv_type, &drv_type);
 415
 416         if (drive_strength) {
 417                 /* if error just use default for drive strength B */
 418                 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
 419                                        &card_strength);
 420                 if (err)
 421                         return;
 422
 423                 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
 424                 card_strength |= host_drive_to_sdio_drive(drive_strength);
 425
 426                 /* if error default to drive strength B */
 427                 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
 428                                        card_strength, NULL);
 429                 if (err)
 430                         return;
 431                 card->drive_strength = drive_strength;
 432         }
 433
 434         if (drv_type)
 435                 mmc_set_driver_type(card->host, drv_type);
 436 }
 437
 438
 439 static int sdio_set_bus_speed_mode(struct mmc_card *card)
 440 {
 441         unsigned int bus_speed, timing;
 442         int err;
 443         unsigned char speed;
 444
 445         /*
 446          * If the host doesn't support any of the UHS-I modes, fallback on
 447          * default speed.
 448          */
 449         if (!mmc_host_uhs(card->host))
 450                 return 0;
 451
 452         bus_speed = SDIO_SPEED_SDR12;
 453         timing = MMC_TIMING_UHS_SDR12;
 454         if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
 455             (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
 456                         bus_speed = SDIO_SPEED_SDR104;
 457                         timing = MMC_TIMING_UHS_SDR104;
 458                         card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
 459                         card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
 460         } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
 461                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
 462                         bus_speed = SDIO_SPEED_DDR50;
 463                         timing = MMC_TIMING_UHS_DDR50;
 464                         card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
 465                         card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
 466         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 467                     MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
 468                     SD_MODE_UHS_SDR50)) {
 469                         bus_speed = SDIO_SPEED_SDR50;
 470                         timing = MMC_TIMING_UHS_SDR50;
 471                         card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
 472                         card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
 473         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 474                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
 475                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
 476                         bus_speed = SDIO_SPEED_SDR25;
 477                         timing = MMC_TIMING_UHS_SDR25;
 478                         card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
 479                         card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
 480         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 481                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
 482                     MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
 483                     SD_MODE_UHS_SDR12)) {
 484                         bus_speed = SDIO_SPEED_SDR12;
 485                         timing = MMC_TIMING_UHS_SDR12;
 486                         card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
 487                         card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
 488         }
 489
 490         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 491         if (err)
 492                 return err;
 493
 494         speed &= ~SDIO_SPEED_BSS_MASK;
 495         speed |= bus_speed;
 496         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 497         if (err)
 498                 return err;
 499
 500         if (bus_speed) {
 501                 mmc_set_timing(card->host, timing);
 502                 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
 503         }
 504
 505         return 0;
 506 }
 507
 508 /*
 509  * UHS-I specific initialization procedure
 510  */
 511 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
 512 {
 513         int err;
 514
 515         if (!card->scr.sda_spec3)
 516                 return 0;
 517
 518         /*
 519          * Switch to wider bus (if supported).
 520          */
 521         if (card->host->caps & MMC_CAP_4_BIT_DATA)
 522                 err = sdio_enable_4bit_bus(card);
 523
 524         /* Set the driver strength for the card */
 525         sdio_select_driver_type(card);
 526
 527         /* Set bus speed mode of the card */
 528         err = sdio_set_bus_speed_mode(card);
 529         if (err)
 530                 goto out;
 531
 532         /*
 533          * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
 534          * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
 535          */
 536         if (!mmc_host_is_spi(card->host) &&
 537             ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
 538               (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
 539                 err = mmc_execute_tuning(card);
 540 out:
 541         return err;
 542 }
 543
 544 /*
 545  * Handle the detection and initialisation of a card.
 546  *
 547  * In the case of a resume, "oldcard" will contain the card
 548  * we're trying to reinitialise.
 549  */
 550 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 551                               struct mmc_card *oldcard, int powered_resume)
 552 {
 553         struct mmc_card *card;
 554         int err;
 555         int retries = 10;
 556         u32 rocr = 0;
 557         u32 ocr_card = ocr;
 558
 559         WARN_ON(!host->claimed);
 560
 561         /* to query card if 1.8V signalling is supported */
 562         if (mmc_host_uhs(host))
 563                 ocr |= R4_18V_PRESENT;
 564
 565 try_again:
 566         if (!retries) {
 567                 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
 568                 ocr &= ~R4_18V_PRESENT;
 569         }
 570
 571         /*
 572          * Inform the card of the voltage
 573          */
 574         if (!powered_resume) {
 575                 err = mmc_send_io_op_cond(host, ocr, &rocr);
 576                 if (err)
 577                         goto err;
 578         }
 579
 580         /*
 581          * For SPI, enable CRC as appropriate.
 582          */
 583         if (mmc_host_is_spi(host)) {
 584                 err = mmc_spi_set_crc(host, use_spi_crc);
 585                 if (err)
 586                         goto err;
 587         }
 588
 589         /*
 590          * Allocate card structure.
 591          */
 592         card = mmc_alloc_card(host, NULL);
 593         if (IS_ERR(card)) {
 594                 err = PTR_ERR(card);
 595                 goto err;
 596         }
 597
 598         if ((rocr & R4_MEMORY_PRESENT) &&
 599             mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
 600                 card->type = MMC_TYPE_SD_COMBO;
 601
 602                 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
 603                     memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
 604                         mmc_remove_card(card);
 605                         return -ENOENT;
 606                 }
 607         } else {
 608                 card->type = MMC_TYPE_SDIO;
 609
 610                 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
 611                         mmc_remove_card(card);
 612                         return -ENOENT;
 613                 }
 614         }
 615
 616         /*
 617          * Call the optional HC's init_card function to handle quirks.
 618          */
 619         if (host->ops->init_card)
 620                 host->ops->init_card(host, card);
 621
 622         /*
 623          * If the host and card support UHS-I mode request the card
 624          * to switch to 1.8V signaling level.  No 1.8v signalling if
 625          * UHS mode is not enabled to maintain compatibility and some
 626          * systems that claim 1.8v signalling in fact do not support
 627          * it.
 628          */
 629         if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
 630                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
 631                                         ocr_card);
 632                 if (err == -EAGAIN) {
 633                         sdio_reset(host);
 634                         mmc_go_idle(host);
 635                         mmc_send_if_cond(host, host->ocr_avail);
 636                         mmc_remove_card(card);
 637                         retries--;
 638                         goto try_again;
 639                 } else if (err) {
 640                         ocr &= ~R4_18V_PRESENT;
 641                 }
 642                 err = 0;
 643         } else {
 644                 ocr &= ~R4_18V_PRESENT;
 645         }
 646
 647         /*
 648          * For native busses:  set card RCA and quit open drain mode.
 649          */
 650         if (!powered_resume && !mmc_host_is_spi(host)) {
 651                 err = mmc_send_relative_addr(host, &card->rca);
 652                 if (err)
 653                         goto remove;
 654
 655                 /*
 656                  * Update oldcard with the new RCA received from the SDIO
 657                  * device -- we're doing this so that it's updated in the
 658                  * "card" struct when oldcard overwrites that later.
 659                  */
 660                 if (oldcard)
 661                         oldcard->rca = card->rca;
 662         }
 663
 664         /*
 665          * Read CSD, before selecting the card
 666          */
 667         if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
 668                 err = mmc_sd_get_csd(host, card);
 669                 if (err)
 670                         return err;
 671
 672                 mmc_decode_cid(card);
 673         }
 674
 675         /*
 676          * Select card, as all following commands rely on that.
 677          */
 678         if (!powered_resume && !mmc_host_is_spi(host)) {
 679                 err = mmc_select_card(card);
 680                 if (err)
 681                         goto remove;
 682         }
 683
 684         if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
 685                 /*
 686                  * This is non-standard SDIO device, meaning it doesn't
 687                  * have any CIA (Common I/O area) registers present.
 688                  * It's host's responsibility to fill cccr and cis
 689                  * structures in init_card().
 690                  */
 691                 mmc_set_clock(host, card->cis.max_dtr);
 692
 693                 if (card->cccr.high_speed) {
 694                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 695                 }
 696
 697                 goto finish;
 698         }
 699
 700         /*
 701          * Read the common registers.
 702          */
 703         err = sdio_read_cccr(card, ocr);
 704         if (err)
 705                 goto remove;
 706
 707         /*
 708          * Read the common CIS tuples.
 709          */
 710         err = sdio_read_common_cis(card);
 711         if (err)
 712                 goto remove;
 713
 714         if (oldcard) {
 715                 int same = (card->cis.vendor == oldcard->cis.vendor &&
 716                             card->cis.device == oldcard->cis.device);
 717                 mmc_remove_card(card);
 718                 if (!same)
 719                         return -ENOENT;
 720
 721                 card = oldcard;
 722         }
 723         card->ocr = ocr_card;
 724         mmc_fixup_device(card, NULL);
 725
 726         if (card->type == MMC_TYPE_SD_COMBO) {
 727                 err = mmc_sd_setup_card(host, card, oldcard != NULL);
 728                 /* handle as SDIO-only card if memory init failed */
 729                 if (err) {
 730                         mmc_go_idle(host);
 731                         if (mmc_host_is_spi(host))
 732                                 /* should not fail, as it worked previously */
 733                                 mmc_spi_set_crc(host, use_spi_crc);
 734                         card->type = MMC_TYPE_SDIO;
 735                 } else
 736                         card->dev.type = &sd_type;
 737         }
 738
 739         /*
 740          * If needed, disconnect card detection pull-up resistor.
 741          */
 742         err = sdio_disable_cd(card);
 743         if (err)
 744                 goto remove;
 745
 746         /* Initialization sequence for UHS-I cards */
 747         /* Only if card supports 1.8v and UHS signaling */
 748         if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
 749                 err = mmc_sdio_init_uhs_card(card);
 750                 if (err)
 751                         goto remove;
 752         } else {
 753                 /*
 754                  * Switch to high-speed (if supported).
 755                  */
 756                 err = sdio_enable_hs(card);
 757                 if (err > 0)
 758                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 759                 else if (err)
 760                         goto remove;
 761
 762                 /*
 763                  * Change to the card's maximum speed.
 764                  */
 765                 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
 766
 767                 /*
 768                  * Switch to wider bus (if supported).
 769                  */
 770                 err = sdio_enable_4bit_bus(card);
 771                 if (err)
 772                         goto remove;
 773         }
 774 finish:
 775         if (!oldcard)
 776                 host->card = card;
 777         return 0;
 778
 779 remove:
 780         if (!oldcard)
 781                 mmc_remove_card(card);
 782
 783 err:
 784         return err;
 785 }
 786
 787 /*
 788  * Host is being removed. Free up the current card.
 789  */
 790 static void mmc_sdio_remove(struct mmc_host *host)
 791 {
 792         int i;
 793
 794         for (i = 0;i < host->card->sdio_funcs;i++) {
 795                 if (host->card->sdio_func[i]) {
 796                         sdio_remove_func(host->card->sdio_func[i]);
 797                         host->card->sdio_func[i] = NULL;
 798                 }
 799         }
 800
 801         mmc_remove_card(host->card);
 802         host->card = NULL;
 803 }
 804
 805 /*
 806  * Card detection - card is alive.
 807  */
 808 static int mmc_sdio_alive(struct mmc_host *host)
 809 {
 810         return mmc_select_card(host->card);
 811 }
 812
 813 /*
 814  * Card detection callback from host.
 815  */
 816 static void mmc_sdio_detect(struct mmc_host *host)
 817 {
 818         int err;
 819
 820         /* Make sure card is powered before detecting it */
 821         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 822                 err = pm_runtime_get_sync(&host->card->dev);
 823                 if (err < 0) {
 824                         pm_runtime_put_noidle(&host->card->dev);
 825                         goto out;
 826                 }
 827         }
 828
 829         mmc_claim_host(host);
 830
 831         /*
 832          * Just check if our card has been removed.
 833          */
 834         err = _mmc_detect_card_removed(host);
 835
 836         mmc_release_host(host);
 837
 838         /*
 839          * Tell PM core it's OK to power off the card now.
 840          *
 841          * The _sync variant is used in order to ensure that the card
 842          * is left powered off in case an error occurred, and the card
 843          * is going to be removed.
 844          *
 845          * Since there is no specific reason to believe a new user
 846          * is about to show up at this point, the _sync variant is
 847          * desirable anyway.
 848          */
 849         if (host->caps & MMC_CAP_POWER_OFF_CARD)
 850                 pm_runtime_put_sync(&host->card->dev);
 851
 852 out:
 853         if (err) {
 854                 mmc_sdio_remove(host);
 855
 856                 mmc_claim_host(host);
 857                 mmc_detach_bus(host);
 858                 mmc_power_off(host);
 859                 mmc_release_host(host);
 860         }
 861 }
 862
 863 /*
 864  * SDIO pre_suspend.  We need to suspend all functions separately.
 865  * Therefore all registered functions must have drivers with suspend
 866  * and resume methods.  Failing that we simply remove the whole card.
 867  */
 868 static int mmc_sdio_pre_suspend(struct mmc_host *host)
 869 {
 870         int i, err = 0;
 871
 872         for (i = 0; i < host->card->sdio_funcs; i++) {
 873                 struct sdio_func *func = host->card->sdio_func[i];
 874                 if (func && sdio_func_present(func) && func->dev.driver) {
 875                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 876                         if (!pmops || !pmops->suspend || !pmops->resume) {
 877                                 /* force removal of entire card in that case */
 878                                 err = -ENOSYS;
 879                                 break;
 880                         }
 881                 }
 882         }
 883
 884         return err;
 885 }
 886
 887 /*
 888  * SDIO suspend.  Suspend all functions separately.
 889  */
 890 static int mmc_sdio_suspend(struct mmc_host *host)
 891 {
 892         mmc_claim_host(host);
 893
 894         if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
 895                 sdio_disable_wide(host->card);
 896
 897         if (!mmc_card_keep_power(host)) {
 898                 mmc_power_off(host);
 899         } else if (host->retune_period) {
 900                 mmc_retune_timer_stop(host);
 901                 mmc_retune_needed(host);
 902         }
 903
 904         mmc_release_host(host);
 905
 906         return 0;
 907 }
 908
 909 static int mmc_sdio_resume(struct mmc_host *host)
 910 {
 911         int err = 0;
 912
 913         /* Basic card reinitialization. */
 914         mmc_claim_host(host);
 915
 916         /* Restore power if needed */
 917         if (!mmc_card_keep_power(host)) {
 918                 mmc_power_up(host, host->card->ocr);
 919                 /*
 920                  * Tell runtime PM core we just powered up the card,
 921                  * since it still believes the card is powered off.
 922                  * Note that currently runtime PM is only enabled
 923                  * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
 924                  */
 925                 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 926                         pm_runtime_disable(&host->card->dev);
 927                         pm_runtime_set_active(&host->card->dev);
 928                         pm_runtime_enable(&host->card->dev);
 929                 }
 930         }
 931
 932         /* No need to reinitialize powered-resumed nonremovable cards */
 933         if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
 934                 sdio_reset(host);
 935                 mmc_go_idle(host);
 936                 mmc_send_if_cond(host, host->card->ocr);
 937                 err = mmc_send_io_op_cond(host, 0, NULL);
 938                 if (!err)
 939                         err = mmc_sdio_init_card(host, host->card->ocr,
 940                                                  host->card,
 941                                                  mmc_card_keep_power(host));
 942         } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 943                 /* We may have switched to 1-bit mode during suspend */
 944                 err = sdio_enable_4bit_bus(host->card);
 945         }
 946
 947         if (!err && host->sdio_irqs) {
 948                 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
 949                         wake_up_process(host->sdio_irq_thread);
 950                 else if (host->caps & MMC_CAP_SDIO_IRQ)
 951                         host->ops->enable_sdio_irq(host, 1);
 952         }
 953
 954         mmc_release_host(host);
 955
 956         host->pm_flags &= ~MMC_PM_KEEP_POWER;
 957         return err;
 958 }
 959
 960 static int mmc_sdio_power_restore(struct mmc_host *host)
 961 {
 962         int ret;
 963
 964         mmc_claim_host(host);
 965
 966         /*
 967          * Reset the card by performing the same steps that are taken by
 968          * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
 969          *
 970          * sdio_reset() is technically not needed. Having just powered up the
 971          * hardware, it should already be in reset state. However, some
 972          * platforms (such as SD8686 on OLPC) do not instantly cut power,
 973          * meaning that a reset is required when restoring power soon after
 974          * powering off. It is harmless in other cases.
 975          *
 976          * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
 977          * is not necessary for non-removable cards. However, it is required
 978          * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
 979          * harmless in other situations.
 980          *
 981          */
 982
 983         sdio_reset(host);
 984         mmc_go_idle(host);
 985         mmc_send_if_cond(host, host->card->ocr);
 986
 987         ret = mmc_send_io_op_cond(host, 0, NULL);
 988         if (ret)
 989                 goto out;
 990
 991         ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
 992                                 mmc_card_keep_power(host));
 993         if (!ret && host->sdio_irqs)
 994                 mmc_signal_sdio_irq(host);
 995
 996 out:
 997         mmc_release_host(host);
 998
 999         return ret;
1000 }
1001
1002 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1003 {
1004         /* No references to the card, cut the power to it. */
1005         mmc_claim_host(host);
1006         mmc_power_off(host);
1007         mmc_release_host(host);
1008
1009         return 0;
1010 }
1011
1012 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1013 {
1014         int ret;
1015
1016         /* Restore power and re-initialize. */
1017         mmc_claim_host(host);
1018         mmc_power_up(host, host->card->ocr);
1019         ret = mmc_sdio_power_restore(host);
1020         mmc_release_host(host);
1021
1022         return ret;
1023 }
1024
1025 static int mmc_sdio_reset(struct mmc_host *host)
1026 {
1027         mmc_power_cycle(host, host->card->ocr);
1028         return mmc_sdio_power_restore(host);
1029 }
1030
1031 static const struct mmc_bus_ops mmc_sdio_ops = {
1032         .remove = mmc_sdio_remove,
1033         .detect = mmc_sdio_detect,
1034         .pre_suspend = mmc_sdio_pre_suspend,
1035         .suspend = mmc_sdio_suspend,
1036         .resume = mmc_sdio_resume,
1037         .runtime_suspend = mmc_sdio_runtime_suspend,
1038         .runtime_resume = mmc_sdio_runtime_resume,
1039         .power_restore = mmc_sdio_power_restore,
1040         .alive = mmc_sdio_alive,
1041         .reset = mmc_sdio_reset,
1042 };
1043
1044
1045 /*
1046  * Starting point for SDIO card init.
1047  */
1048 int mmc_attach_sdio(struct mmc_host *host)
1049 {
1050         int err, i, funcs;
1051         u32 ocr, rocr;
1052         struct mmc_card *card;
1053
1054         WARN_ON(!host->claimed);
1055
1056         err = mmc_send_io_op_cond(host, 0, &ocr);
1057         if (err)
1058                 return err;
1059
1060         mmc_attach_bus(host, &mmc_sdio_ops);
1061         if (host->ocr_avail_sdio)
1062                 host->ocr_avail = host->ocr_avail_sdio;
1063
1064
1065         rocr = mmc_select_voltage(host, ocr);
1066
1067         /*
1068          * Can we support the voltage(s) of the card(s)?
1069          */
1070         if (!rocr) {
1071                 err = -EINVAL;
1072                 goto err;
1073         }
1074
1075         /*
1076          * Detect and init the card.
1077          */
1078         err = mmc_sdio_init_card(host, rocr, NULL, 0);
1079         if (err)
1080                 goto err;
1081
1082         card = host->card;
1083
1084         /*
1085          * Enable runtime PM only if supported by host+card+board
1086          */
1087         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1088                 /*
1089                  * Let runtime PM core know our card is active
1090                  */
1091                 err = pm_runtime_set_active(&card->dev);
1092                 if (err)
1093                         goto remove;
1094
1095                 /*
1096                  * Enable runtime PM for this card
1097                  */
1098                 pm_runtime_enable(&card->dev);
1099         }
1100
1101         /*
1102          * The number of functions on the card is encoded inside
1103          * the ocr.
1104          */
1105         funcs = (ocr & 0x70000000) >> 28;
1106         card->sdio_funcs = 0;
1107
1108         /*
1109          * Initialize (but don't add) all present functions.
1110          */
1111         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1112                 err = sdio_init_func(host->card, i + 1);
1113                 if (err)
1114                         goto remove;
1115
1116                 /*
1117                  * Enable Runtime PM for this func (if supported)
1118                  */
1119                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1120                         pm_runtime_enable(&card->sdio_func[i]->dev);
1121         }
1122
1123         /*
1124          * First add the card to the driver model...
1125          */
1126         mmc_release_host(host);
1127         err = mmc_add_card(host->card);
1128         if (err)
1129                 goto remove_added;
1130
1131         /*
1132          * ...then the SDIO functions.
1133          */
1134         for (i = 0;i < funcs;i++) {
1135                 err = sdio_add_func(host->card->sdio_func[i]);
1136                 if (err)
1137                         goto remove_added;
1138         }
1139
1140         mmc_claim_host(host);
1141         return 0;
1142
1143
1144 remove_added:
1145         /* Remove without lock if the device has been added. */
1146         mmc_sdio_remove(host);
1147         mmc_claim_host(host);
1148 remove:
1149         /* And with lock if it hasn't been added. */
1150         mmc_release_host(host);
1151         if (host->card)
1152                 mmc_sdio_remove(host);
1153         mmc_claim_host(host);
1154 err:
1155         mmc_detach_bus(host);
1156
1157         pr_err("%s: error %d whilst initialising SDIO card\n",
1158                 mmc_hostname(host), err);
1159
1160         return err;
1161 }
1162