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 (mmc_host_uhs(card->host)) {
 161                                 if (data & SDIO_UHS_DDR50)
 162                                         card->sw_caps.sd3_bus_mode
 163                                                 |= SD_MODE_UHS_DDR50;
 164
 165                                 if (data & SDIO_UHS_SDR50)
 166                                         card->sw_caps.sd3_bus_mode
 167                                                 |= SD_MODE_UHS_SDR50;
 168
 169                                 if (data & SDIO_UHS_SDR104)
 170                                         card->sw_caps.sd3_bus_mode
 171                                                 |= SD_MODE_UHS_SDR104;
 172                         }
 173
 174                         ret = mmc_io_rw_direct(card, 0, 0,
 175                                 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
 176                         if (ret)
 177                                 goto out;
 178
 179                         if (data & SDIO_DRIVE_SDTA)
 180                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
 181                         if (data & SDIO_DRIVE_SDTC)
 182                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
 183                         if (data & SDIO_DRIVE_SDTD)
 184                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
 185                 }
 186
 187                 /* if no uhs mode ensure we check for high speed */
 188                 if (!card->sw_caps.sd3_bus_mode) {
 189                         if (speed & SDIO_SPEED_SHS) {
 190                                 card->cccr.high_speed = 1;
 191                                 card->sw_caps.hs_max_dtr = 50000000;
 192                         } else {
 193                                 card->cccr.high_speed = 0;
 194                                 card->sw_caps.hs_max_dtr = 25000000;
 195                         }
 196                 }
 197         }
 198
 199 out:
 200         return ret;
 201 }
 202
 203 static int sdio_enable_wide(struct mmc_card *card)
 204 {
 205         int ret;
 206         u8 ctrl;
 207
 208         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 209                 return 0;
 210
 211         if (card->cccr.low_speed && !card->cccr.wide_bus)
 212                 return 0;
 213
 214         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 215         if (ret)
 216                 return ret;
 217
 218         if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
 219                 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
 220                         mmc_hostname(card->host), ctrl);
 221
 222         /* set as 4-bit bus width */
 223         ctrl &= ~SDIO_BUS_WIDTH_MASK;
 224         ctrl |= SDIO_BUS_WIDTH_4BIT;
 225
 226         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 227         if (ret)
 228                 return ret;
 229
 230         return 1;
 231 }
 232
 233 /*
 234  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
 235  * of the card. This may be required on certain setups of boards,
 236  * controllers and embedded sdio device which do not need the card's
 237  * pull-up. As a result, card detection is disabled and power is saved.
 238  */
 239 static int sdio_disable_cd(struct mmc_card *card)
 240 {
 241         int ret;
 242         u8 ctrl;
 243
 244         if (!mmc_card_disable_cd(card))
 245                 return 0;
 246
 247         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 248         if (ret)
 249                 return ret;
 250
 251         ctrl |= SDIO_BUS_CD_DISABLE;
 252
 253         return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 254 }
 255
 256 /*
 257  * Devices that remain active during a system suspend are
 258  * put back into 1-bit mode.
 259  */
 260 static int sdio_disable_wide(struct mmc_card *card)
 261 {
 262         int ret;
 263         u8 ctrl;
 264
 265         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 266                 return 0;
 267
 268         if (card->cccr.low_speed && !card->cccr.wide_bus)
 269                 return 0;
 270
 271         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 272         if (ret)
 273                 return ret;
 274
 275         if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
 276                 return 0;
 277
 278         ctrl &= ~SDIO_BUS_WIDTH_4BIT;
 279         ctrl |= SDIO_BUS_ASYNC_INT;
 280
 281         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 282         if (ret)
 283                 return ret;
 284
 285         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
 286
 287         return 0;
 288 }
 289
 290
 291 static int sdio_enable_4bit_bus(struct mmc_card *card)
 292 {
 293         int err;
 294
 295         if (card->type == MMC_TYPE_SDIO)
 296                 err = sdio_enable_wide(card);
 297         else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
 298                  (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 299                 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 300                 if (err)
 301                         return err;
 302                 err = sdio_enable_wide(card);
 303                 if (err <= 0)
 304                         mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
 305         } else
 306                 return 0;
 307
 308         if (err > 0) {
 309                 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 310                 err = 0;
 311         }
 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_hs(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 card_drv_type, drive_strength, drv_type;
 406         unsigned char card_strength;
 407         int err;
 408
 409         card->drive_strength = 0;
 410
 411         card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
 412
 413         drive_strength = mmc_select_drive_strength(card,
 414                                                    card->sw_caps.uhs_max_dtr,
 415                                                    card_drv_type, &drv_type);
 416
 417         if (drive_strength) {
 418                 /* if error just use default for drive strength B */
 419                 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
 420                                        &card_strength);
 421                 if (err)
 422                         return;
 423
 424                 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
 425                 card_strength |= host_drive_to_sdio_drive(drive_strength);
 426
 427                 /* if error default to drive strength B */
 428                 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
 429                                        card_strength, NULL);
 430                 if (err)
 431                         return;
 432                 card->drive_strength = drive_strength;
 433         }
 434
 435         if (drv_type)
 436                 mmc_set_driver_type(card->host, drv_type);
 437 }
 438
 439
 440 static int sdio_set_bus_speed_mode(struct mmc_card *card)
 441 {
 442         unsigned int bus_speed, timing;
 443         int err;
 444         unsigned char speed;
 445
 446         /*
 447          * If the host doesn't support any of the UHS-I modes, fallback on
 448          * default speed.
 449          */
 450         if (!mmc_host_uhs(card->host))
 451                 return 0;
 452
 453         bus_speed = SDIO_SPEED_SDR12;
 454         timing = MMC_TIMING_UHS_SDR12;
 455         if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
 456             (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
 457                         bus_speed = SDIO_SPEED_SDR104;
 458                         timing = MMC_TIMING_UHS_SDR104;
 459                         card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
 460                         card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
 461         } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
 462                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
 463                         bus_speed = SDIO_SPEED_DDR50;
 464                         timing = MMC_TIMING_UHS_DDR50;
 465                         card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
 466                         card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
 467         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 468                     MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
 469                     SD_MODE_UHS_SDR50)) {
 470                         bus_speed = SDIO_SPEED_SDR50;
 471                         timing = MMC_TIMING_UHS_SDR50;
 472                         card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
 473                         card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
 474         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 475                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
 476                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
 477                         bus_speed = SDIO_SPEED_SDR25;
 478                         timing = MMC_TIMING_UHS_SDR25;
 479                         card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
 480                         card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
 481         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 482                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
 483                     MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
 484                     SD_MODE_UHS_SDR12)) {
 485                         bus_speed = SDIO_SPEED_SDR12;
 486                         timing = MMC_TIMING_UHS_SDR12;
 487                         card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
 488                         card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
 489         }
 490
 491         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 492         if (err)
 493                 return err;
 494
 495         speed &= ~SDIO_SPEED_BSS_MASK;
 496         speed |= bus_speed;
 497         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 498         if (err)
 499                 return err;
 500
 501         if (bus_speed) {
 502                 mmc_set_timing(card->host, timing);
 503                 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
 504         }
 505
 506         return 0;
 507 }
 508
 509 /*
 510  * UHS-I specific initialization procedure
 511  */
 512 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
 513 {
 514         int err;
 515
 516         if (!card->scr.sda_spec3)
 517                 return 0;
 518
 519         /*
 520          * Switch to wider bus (if supported).
 521          */
 522         if (card->host->caps & MMC_CAP_4_BIT_DATA)
 523                 err = sdio_enable_4bit_bus(card);
 524
 525         /* Set the driver strength for the card */
 526         sdio_select_driver_type(card);
 527
 528         /* Set bus speed mode of the card */
 529         err = sdio_set_bus_speed_mode(card);
 530         if (err)
 531                 goto out;
 532
 533         /*
 534          * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
 535          * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
 536          */
 537         if (!mmc_host_is_spi(card->host) &&
 538             ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) ||
 539              (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)))
 540                 err = mmc_execute_tuning(card);
 541 out:
 542         return err;
 543 }
 544
 545 /*
 546  * Handle the detection and initialisation of a card.
 547  *
 548  * In the case of a resume, "oldcard" will contain the card
 549  * we're trying to reinitialise.
 550  */
 551 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 552                               struct mmc_card *oldcard, int powered_resume)
 553 {
 554         struct mmc_card *card;
 555         int err;
 556         int retries = 10;
 557         u32 rocr = 0;
 558         u32 ocr_card = ocr;
 559
 560         BUG_ON(!host);
 561         WARN_ON(!host->claimed);
 562
 563         /* to query card if 1.8V signalling is supported */
 564         if (mmc_host_uhs(host))
 565                 ocr |= R4_18V_PRESENT;
 566
 567 try_again:
 568         if (!retries) {
 569                 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
 570                 ocr &= ~R4_18V_PRESENT;
 571         }
 572
 573         /*
 574          * Inform the card of the voltage
 575          */
 576         if (!powered_resume) {
 577                 err = mmc_send_io_op_cond(host, ocr, &rocr);
 578                 if (err)
 579                         goto err;
 580         }
 581
 582         /*
 583          * For SPI, enable CRC as appropriate.
 584          */
 585         if (mmc_host_is_spi(host)) {
 586                 err = mmc_spi_set_crc(host, use_spi_crc);
 587                 if (err)
 588                         goto err;
 589         }
 590
 591         /*
 592          * Allocate card structure.
 593          */
 594         card = mmc_alloc_card(host, NULL);
 595         if (IS_ERR(card)) {
 596                 err = PTR_ERR(card);
 597                 goto err;
 598         }
 599
 600         if ((rocr & R4_MEMORY_PRESENT) &&
 601             mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
 602                 card->type = MMC_TYPE_SD_COMBO;
 603
 604                 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
 605                     memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
 606                         mmc_remove_card(card);
 607                         return -ENOENT;
 608                 }
 609         } else {
 610                 card->type = MMC_TYPE_SDIO;
 611
 612                 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
 613                         mmc_remove_card(card);
 614                         return -ENOENT;
 615                 }
 616         }
 617
 618         /*
 619          * Call the optional HC's init_card function to handle quirks.
 620          */
 621         if (host->ops->init_card)
 622                 host->ops->init_card(host, card);
 623
 624         /*
 625          * If the host and card support UHS-I mode request the card
 626          * to switch to 1.8V signaling level.  No 1.8v signalling if
 627          * UHS mode is not enabled to maintain compatibility and some
 628          * systems that claim 1.8v signalling in fact do not support
 629          * it.
 630          */
 631         if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
 632                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
 633                                         ocr);
 634                 if (err == -EAGAIN) {
 635                         sdio_reset(host);
 636                         mmc_go_idle(host);
 637                         mmc_send_if_cond(host, host->ocr_avail);
 638                         mmc_remove_card(card);
 639                         retries--;
 640                         goto try_again;
 641                 } else if (err) {
 642                         ocr &= ~R4_18V_PRESENT;
 643                 }
 644                 err = 0;
 645         } else {
 646                 ocr &= ~R4_18V_PRESENT;
 647         }
 648
 649         /*
 650          * For native busses:  set card RCA and quit open drain mode.
 651          */
 652         if (!powered_resume && !mmc_host_is_spi(host)) {
 653                 err = mmc_send_relative_addr(host, &card->rca);
 654                 if (err)
 655                         goto remove;
 656
 657                 /*
 658                  * Update oldcard with the new RCA received from the SDIO
 659                  * device -- we're doing this so that it's updated in the
 660                  * "card" struct when oldcard overwrites that later.
 661                  */
 662                 if (oldcard)
 663                         oldcard->rca = card->rca;
 664         }
 665
 666         /*
 667          * Read CSD, before selecting the card
 668          */
 669         if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
 670                 err = mmc_sd_get_csd(host, card);
 671                 if (err)
 672                         return err;
 673
 674                 mmc_decode_cid(card);
 675         }
 676
 677         /*
 678          * Select card, as all following commands rely on that.
 679          */
 680         if (!powered_resume && !mmc_host_is_spi(host)) {
 681                 err = mmc_select_card(card);
 682                 if (err)
 683                         goto remove;
 684         }
 685
 686         if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
 687                 /*
 688                  * This is non-standard SDIO device, meaning it doesn't
 689                  * have any CIA (Common I/O area) registers present.
 690                  * It's host's responsibility to fill cccr and cis
 691                  * structures in init_card().
 692                  */
 693                 mmc_set_clock(host, card->cis.max_dtr);
 694
 695                 if (card->cccr.high_speed) {
 696                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 697                 }
 698
 699                 goto finish;
 700         }
 701
 702         /*
 703          * Read the common registers.
 704          */
 705         err = sdio_read_cccr(card, ocr);
 706         if (err)
 707                 goto remove;
 708
 709         /*
 710          * Read the common CIS tuples.
 711          */
 712         err = sdio_read_common_cis(card);
 713         if (err)
 714                 goto remove;
 715
 716         if (oldcard) {
 717                 int same = (card->cis.vendor == oldcard->cis.vendor &&
 718                             card->cis.device == oldcard->cis.device);
 719                 mmc_remove_card(card);
 720                 if (!same)
 721                         return -ENOENT;
 722
 723                 card = oldcard;
 724         }
 725         card->ocr = ocr_card;
 726         mmc_fixup_device(card, NULL);
 727
 728         if (card->type == MMC_TYPE_SD_COMBO) {
 729                 err = mmc_sd_setup_card(host, card, oldcard != NULL);
 730                 /* handle as SDIO-only card if memory init failed */
 731                 if (err) {
 732                         mmc_go_idle(host);
 733                         if (mmc_host_is_spi(host))
 734                                 /* should not fail, as it worked previously */
 735                                 mmc_spi_set_crc(host, use_spi_crc);
 736                         card->type = MMC_TYPE_SDIO;
 737                 } else
 738                         card->dev.type = &sd_type;
 739         }
 740
 741         /*
 742          * If needed, disconnect card detection pull-up resistor.
 743          */
 744         err = sdio_disable_cd(card);
 745         if (err)
 746                 goto remove;
 747
 748         /* Initialization sequence for UHS-I cards */
 749         /* Only if card supports 1.8v and UHS signaling */
 750         if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
 751                 err = mmc_sdio_init_uhs_card(card);
 752                 if (err)
 753                         goto remove;
 754         } else {
 755                 /*
 756                  * Switch to high-speed (if supported).
 757                  */
 758                 err = sdio_enable_hs(card);
 759                 if (err > 0)
 760                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 761                 else if (err)
 762                         goto remove;
 763
 764                 /*
 765                  * Change to the card's maximum speed.
 766                  */
 767                 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
 768
 769                 /*
 770                  * Switch to wider bus (if supported).
 771                  */
 772                 err = sdio_enable_4bit_bus(card);
 773                 if (err)
 774                         goto remove;
 775         }
 776 finish:
 777         if (!oldcard)
 778                 host->card = card;
 779         return 0;
 780
 781 remove:
 782         if (!oldcard)
 783                 mmc_remove_card(card);
 784
 785 err:
 786         return err;
 787 }
 788
 789 /*
 790  * Host is being removed. Free up the current card.
 791  */
 792 static void mmc_sdio_remove(struct mmc_host *host)
 793 {
 794         int i;
 795
 796         BUG_ON(!host);
 797         BUG_ON(!host->card);
 798
 799         for (i = 0;i < host->card->sdio_funcs;i++) {
 800                 if (host->card->sdio_func[i]) {
 801                         sdio_remove_func(host->card->sdio_func[i]);
 802                         host->card->sdio_func[i] = NULL;
 803                 }
 804         }
 805
 806         mmc_remove_card(host->card);
 807         host->card = NULL;
 808 }
 809
 810 /*
 811  * Card detection - card is alive.
 812  */
 813 static int mmc_sdio_alive(struct mmc_host *host)
 814 {
 815         return mmc_select_card(host->card);
 816 }
 817
 818 /*
 819  * Card detection callback from host.
 820  */
 821 static void mmc_sdio_detect(struct mmc_host *host)
 822 {
 823         int err;
 824
 825         BUG_ON(!host);
 826         BUG_ON(!host->card);
 827
 828         /* Make sure card is powered before detecting it */
 829         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 830                 err = pm_runtime_get_sync(&host->card->dev);
 831                 if (err < 0) {
 832                         pm_runtime_put_noidle(&host->card->dev);
 833                         goto out;
 834                 }
 835         }
 836
 837         mmc_claim_host(host);
 838
 839         /*
 840          * Just check if our card has been removed.
 841          */
 842         err = _mmc_detect_card_removed(host);
 843
 844         mmc_release_host(host);
 845
 846         /*
 847          * Tell PM core it's OK to power off the card now.
 848          *
 849          * The _sync variant is used in order to ensure that the card
 850          * is left powered off in case an error occurred, and the card
 851          * is going to be removed.
 852          *
 853          * Since there is no specific reason to believe a new user
 854          * is about to show up at this point, the _sync variant is
 855          * desirable anyway.
 856          */
 857         if (host->caps & MMC_CAP_POWER_OFF_CARD)
 858                 pm_runtime_put_sync(&host->card->dev);
 859
 860 out:
 861         if (err) {
 862                 mmc_sdio_remove(host);
 863
 864                 mmc_claim_host(host);
 865                 mmc_detach_bus(host);
 866                 mmc_power_off(host);
 867                 mmc_release_host(host);
 868         }
 869 }
 870
 871 /*
 872  * SDIO pre_suspend.  We need to suspend all functions separately.
 873  * Therefore all registered functions must have drivers with suspend
 874  * and resume methods.  Failing that we simply remove the whole card.
 875  */
 876 static int mmc_sdio_pre_suspend(struct mmc_host *host)
 877 {
 878         int i, err = 0;
 879
 880         for (i = 0; i < host->card->sdio_funcs; i++) {
 881                 struct sdio_func *func = host->card->sdio_func[i];
 882                 if (func && sdio_func_present(func) && func->dev.driver) {
 883                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 884                         if (!pmops || !pmops->suspend || !pmops->resume) {
 885                                 /* force removal of entire card in that case */
 886                                 err = -ENOSYS;
 887                                 break;
 888                         }
 889                 }
 890         }
 891
 892         return err;
 893 }
 894
 895 /*
 896  * SDIO suspend.  Suspend all functions separately.
 897  */
 898 static int mmc_sdio_suspend(struct mmc_host *host)
 899 {
 900         mmc_claim_host(host);
 901
 902         if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
 903                 sdio_disable_wide(host->card);
 904
 905         if (!mmc_card_keep_power(host)) {
 906                 mmc_power_off(host);
 907         } else if (host->retune_period) {
 908                 mmc_retune_timer_stop(host);
 909                 mmc_retune_needed(host);
 910         }
 911
 912         mmc_release_host(host);
 913
 914         return 0;
 915 }
 916
 917 static int mmc_sdio_resume(struct mmc_host *host)
 918 {
 919         int err = 0;
 920
 921         BUG_ON(!host);
 922         BUG_ON(!host->card);
 923
 924         /* Basic card reinitialization. */
 925         mmc_claim_host(host);
 926
 927         /* Restore power if needed */
 928         if (!mmc_card_keep_power(host)) {
 929                 mmc_power_up(host, host->card->ocr);
 930                 /*
 931                  * Tell runtime PM core we just powered up the card,
 932                  * since it still believes the card is powered off.
 933                  * Note that currently runtime PM is only enabled
 934                  * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
 935                  */
 936                 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 937                         pm_runtime_disable(&host->card->dev);
 938                         pm_runtime_set_active(&host->card->dev);
 939                         pm_runtime_enable(&host->card->dev);
 940                 }
 941         }
 942
 943         /* No need to reinitialize powered-resumed nonremovable cards */
 944         if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
 945                 sdio_reset(host);
 946                 mmc_go_idle(host);
 947                 mmc_send_if_cond(host, host->card->ocr);
 948                 err = mmc_send_io_op_cond(host, 0, NULL);
 949                 if (!err)
 950                         err = mmc_sdio_init_card(host, host->card->ocr,
 951                                                  host->card,
 952                                                  mmc_card_keep_power(host));
 953         } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 954                 /* We may have switched to 1-bit mode during suspend */
 955                 err = sdio_enable_4bit_bus(host->card);
 956         }
 957
 958         if (!err && host->sdio_irqs) {
 959                 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
 960                         wake_up_process(host->sdio_irq_thread);
 961                 else if (host->caps & MMC_CAP_SDIO_IRQ)
 962                         host->ops->enable_sdio_irq(host, 1);
 963         }
 964
 965         mmc_release_host(host);
 966
 967         host->pm_flags &= ~MMC_PM_KEEP_POWER;
 968         return err;
 969 }
 970
 971 static int mmc_sdio_power_restore(struct mmc_host *host)
 972 {
 973         int ret;
 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          */
 996
 997         sdio_reset(host);
 998         mmc_go_idle(host);
 999         mmc_send_if_cond(host, host->card->ocr);
1000
1001         ret = mmc_send_io_op_cond(host, 0, NULL);
1002         if (ret)
1003                 goto out;
1004
1005         ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1006                                 mmc_card_keep_power(host));
1007         if (!ret && host->sdio_irqs)
1008                 mmc_signal_sdio_irq(host);
1009
1010 out:
1011         mmc_release_host(host);
1012
1013         return ret;
1014 }
1015
1016 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1017 {
1018         /* No references to the card, cut the power to it. */
1019         mmc_claim_host(host);
1020         mmc_power_off(host);
1021         mmc_release_host(host);
1022
1023         return 0;
1024 }
1025
1026 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1027 {
1028         int ret;
1029
1030         /* Restore power and re-initialize. */
1031         mmc_claim_host(host);
1032         mmc_power_up(host, host->card->ocr);
1033         ret = mmc_sdio_power_restore(host);
1034         mmc_release_host(host);
1035
1036         return ret;
1037 }
1038
1039 static int mmc_sdio_reset(struct mmc_host *host)
1040 {
1041         mmc_power_cycle(host, host->card->ocr);
1042         return mmc_sdio_power_restore(host);
1043 }
1044
1045 static const struct mmc_bus_ops mmc_sdio_ops = {
1046         .remove = mmc_sdio_remove,
1047         .detect = mmc_sdio_detect,
1048         .pre_suspend = mmc_sdio_pre_suspend,
1049         .suspend = mmc_sdio_suspend,
1050         .resume = mmc_sdio_resume,
1051         .runtime_suspend = mmc_sdio_runtime_suspend,
1052         .runtime_resume = mmc_sdio_runtime_resume,
1053         .power_restore = mmc_sdio_power_restore,
1054         .alive = mmc_sdio_alive,
1055         .reset = mmc_sdio_reset,
1056 };
1057
1058
1059 /*
1060  * Starting point for SDIO card init.
1061  */
1062 int mmc_attach_sdio(struct mmc_host *host)
1063 {
1064         int err, i, funcs;
1065         u32 ocr, rocr;
1066         struct mmc_card *card;
1067
1068         BUG_ON(!host);
1069         WARN_ON(!host->claimed);
1070
1071         err = mmc_send_io_op_cond(host, 0, &ocr);
1072         if (err)
1073                 return err;
1074
1075         mmc_attach_bus(host, &mmc_sdio_ops);
1076         if (host->ocr_avail_sdio)
1077                 host->ocr_avail = host->ocr_avail_sdio;
1078
1079
1080         rocr = mmc_select_voltage(host, ocr);
1081
1082         /*
1083          * Can we support the voltage(s) of the card(s)?
1084          */
1085         if (!rocr) {
1086                 err = -EINVAL;
1087                 goto err;
1088         }
1089
1090         /*
1091          * Detect and init the card.
1092          */
1093         err = mmc_sdio_init_card(host, rocr, NULL, 0);
1094         if (err)
1095                 goto err;
1096
1097         card = host->card;
1098
1099         /*
1100          * Enable runtime PM only if supported by host+card+board
1101          */
1102         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1103                 /*
1104                  * Let runtime PM core know our card is active
1105                  */
1106                 err = pm_runtime_set_active(&card->dev);
1107                 if (err)
1108                         goto remove;
1109
1110                 /*
1111                  * Enable runtime PM for this card
1112                  */
1113                 pm_runtime_enable(&card->dev);
1114         }
1115
1116         /*
1117          * The number of functions on the card is encoded inside
1118          * the ocr.
1119          */
1120         funcs = (ocr & 0x70000000) >> 28;
1121         card->sdio_funcs = 0;
1122
1123         /*
1124          * Initialize (but don't add) all present functions.
1125          */
1126         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1127                 err = sdio_init_func(host->card, i + 1);
1128                 if (err)
1129                         goto remove;
1130
1131                 /*
1132                  * Enable Runtime PM for this func (if supported)
1133                  */
1134                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1135                         pm_runtime_enable(&card->sdio_func[i]->dev);
1136         }
1137
1138         /*
1139          * First add the card to the driver model...
1140          */
1141         mmc_release_host(host);
1142         err = mmc_add_card(host->card);
1143         if (err)
1144                 goto remove_added;
1145
1146         /*
1147          * ...then the SDIO functions.
1148          */
1149         for (i = 0;i < funcs;i++) {
1150                 err = sdio_add_func(host->card->sdio_func[i]);
1151                 if (err)
1152                         goto remove_added;
1153         }
1154
1155         mmc_claim_host(host);
1156         return 0;
1157
1158
1159 remove_added:
1160         /* Remove without lock if the device has been added. */
1161         mmc_sdio_remove(host);
1162         mmc_claim_host(host);
1163 remove:
1164         /* And with lock if it hasn't been added. */
1165         mmc_release_host(host);
1166         if (host->card)
1167                 mmc_sdio_remove(host);
1168         mmc_claim_host(host);
1169 err:
1170         mmc_detach_bus(host);
1171
1172         pr_err("%s: error %d whilst initialising SDIO card\n",
1173                 mmc_hostname(host), err);
1174
1175         return err;
1176 }
1177