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                 return sdio_enable_wide(card);
 297
 298         if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
 299                 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 300                 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 301                 if (err)
 302                         return err;
 303         } else
 304                 return 0;
 305
 306         err = sdio_enable_wide(card);
 307         if (err <= 0)
 308                 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
 309
 310         return err;
 311 }
 312
 313
 314 /*
 315  * Test if the card supports high-speed mode and, if so, switch to it.
 316  */
 317 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
 318 {
 319         int ret;
 320         u8 speed;
 321
 322         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
 323                 return 0;
 324
 325         if (!card->cccr.high_speed)
 326                 return 0;
 327
 328         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 329         if (ret)
 330                 return ret;
 331
 332         if (enable)
 333                 speed |= SDIO_SPEED_EHS;
 334         else
 335                 speed &= ~SDIO_SPEED_EHS;
 336
 337         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 338         if (ret)
 339                 return ret;
 340
 341         return 1;
 342 }
 343
 344 /*
 345  * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
 346  */
 347 static int sdio_enable_hs(struct mmc_card *card)
 348 {
 349         int ret;
 350
 351         ret = mmc_sdio_switch_hs(card, true);
 352         if (ret <= 0 || card->type == MMC_TYPE_SDIO)
 353                 return ret;
 354
 355         ret = mmc_sd_switch_hs(card);
 356         if (ret <= 0)
 357                 mmc_sdio_switch_hs(card, false);
 358
 359         return ret;
 360 }
 361
 362 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
 363 {
 364         unsigned max_dtr;
 365
 366         if (mmc_card_hs(card)) {
 367                 /*
 368                  * The SDIO specification doesn't mention how
 369                  * the CIS transfer speed register relates to
 370                  * high-speed, but it seems that 50 MHz is
 371                  * mandatory.
 372                  */
 373                 max_dtr = 50000000;
 374         } else {
 375                 max_dtr = card->cis.max_dtr;
 376         }
 377
 378         if (card->type == MMC_TYPE_SD_COMBO)
 379                 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
 380
 381         return max_dtr;
 382 }
 383
 384 static unsigned char host_drive_to_sdio_drive(int host_strength)
 385 {
 386         switch (host_strength) {
 387         case MMC_SET_DRIVER_TYPE_A:
 388                 return SDIO_DTSx_SET_TYPE_A;
 389         case MMC_SET_DRIVER_TYPE_B:
 390                 return SDIO_DTSx_SET_TYPE_B;
 391         case MMC_SET_DRIVER_TYPE_C:
 392                 return SDIO_DTSx_SET_TYPE_C;
 393         case MMC_SET_DRIVER_TYPE_D:
 394                 return SDIO_DTSx_SET_TYPE_D;
 395         default:
 396                 return SDIO_DTSx_SET_TYPE_B;
 397         }
 398 }
 399
 400 static void sdio_select_driver_type(struct mmc_card *card)
 401 {
 402         int host_drv_type = SD_DRIVER_TYPE_B;
 403         int card_drv_type = SD_DRIVER_TYPE_B;
 404         int drive_strength;
 405         unsigned char card_strength;
 406         int err;
 407
 408         /*
 409          * If the host doesn't support any of the Driver Types A,C or D,
 410          * or there is no board specific handler then default Driver
 411          * Type B is used.
 412          */
 413         if (!(card->host->caps &
 414                 (MMC_CAP_DRIVER_TYPE_A |
 415                  MMC_CAP_DRIVER_TYPE_C |
 416                  MMC_CAP_DRIVER_TYPE_D)))
 417                 return;
 418
 419         if (!card->host->ops->select_drive_strength)
 420                 return;
 421
 422         if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
 423                 host_drv_type |= SD_DRIVER_TYPE_A;
 424
 425         if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
 426                 host_drv_type |= SD_DRIVER_TYPE_C;
 427
 428         if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
 429                 host_drv_type |= SD_DRIVER_TYPE_D;
 430
 431         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
 432                 card_drv_type |= SD_DRIVER_TYPE_A;
 433
 434         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
 435                 card_drv_type |= SD_DRIVER_TYPE_C;
 436
 437         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
 438                 card_drv_type |= SD_DRIVER_TYPE_D;
 439
 440         /*
 441          * The drive strength that the hardware can support
 442          * depends on the board design.  Pass the appropriate
 443          * information and let the hardware specific code
 444          * return what is possible given the options
 445          */
 446         drive_strength = card->host->ops->select_drive_strength(
 447                 card->sw_caps.uhs_max_dtr,
 448                 host_drv_type, card_drv_type);
 449
 450         /* if error just use default for drive strength B */
 451         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
 452                 &card_strength);
 453         if (err)
 454                 return;
 455
 456         card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
 457         card_strength |= host_drive_to_sdio_drive(drive_strength);
 458
 459         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
 460                 card_strength, NULL);
 461
 462         /* if error default to drive strength B */
 463         if (!err)
 464                 mmc_set_driver_type(card->host, drive_strength);
 465 }
 466
 467
 468 static int sdio_set_bus_speed_mode(struct mmc_card *card)
 469 {
 470         unsigned int bus_speed, timing;
 471         int err;
 472         unsigned char speed;
 473
 474         /*
 475          * If the host doesn't support any of the UHS-I modes, fallback on
 476          * default speed.
 477          */
 478         if (!mmc_host_uhs(card->host))
 479                 return 0;
 480
 481         bus_speed = SDIO_SPEED_SDR12;
 482         timing = MMC_TIMING_UHS_SDR12;
 483         if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
 484             (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
 485                         bus_speed = SDIO_SPEED_SDR104;
 486                         timing = MMC_TIMING_UHS_SDR104;
 487                         card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
 488                         card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
 489         } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
 490                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
 491                         bus_speed = SDIO_SPEED_DDR50;
 492                         timing = MMC_TIMING_UHS_DDR50;
 493                         card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
 494                         card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
 495         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 496                     MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
 497                     SD_MODE_UHS_SDR50)) {
 498                         bus_speed = SDIO_SPEED_SDR50;
 499                         timing = MMC_TIMING_UHS_SDR50;
 500                         card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
 501                         card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
 502         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 503                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
 504                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
 505                         bus_speed = SDIO_SPEED_SDR25;
 506                         timing = MMC_TIMING_UHS_SDR25;
 507                         card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
 508                         card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
 509         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 510                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
 511                     MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
 512                     SD_MODE_UHS_SDR12)) {
 513                         bus_speed = SDIO_SPEED_SDR12;
 514                         timing = MMC_TIMING_UHS_SDR12;
 515                         card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
 516                         card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
 517         }
 518
 519         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 520         if (err)
 521                 return err;
 522
 523         speed &= ~SDIO_SPEED_BSS_MASK;
 524         speed |= bus_speed;
 525         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 526         if (err)
 527                 return err;
 528
 529         if (bus_speed) {
 530                 mmc_set_timing(card->host, timing);
 531                 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
 532         }
 533
 534         return 0;
 535 }
 536
 537 /*
 538  * UHS-I specific initialization procedure
 539  */
 540 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
 541 {
 542         int err;
 543
 544         if (!card->scr.sda_spec3)
 545                 return 0;
 546
 547         /*
 548          * Switch to wider bus (if supported).
 549          */
 550         if (card->host->caps & MMC_CAP_4_BIT_DATA) {
 551                 err = sdio_enable_4bit_bus(card);
 552                 if (err > 0) {
 553                         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 554                         err = 0;
 555                 }
 556         }
 557
 558         /* Set the driver strength for the card */
 559         sdio_select_driver_type(card);
 560
 561         /* Set bus speed mode of the card */
 562         err = sdio_set_bus_speed_mode(card);
 563         if (err)
 564                 goto out;
 565
 566         /*
 567          * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
 568          * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
 569          */
 570         if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning &&
 571                         ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) ||
 572                          (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104))) {
 573                 mmc_host_clk_hold(card->host);
 574                 err = card->host->ops->execute_tuning(card->host,
 575                                                       MMC_SEND_TUNING_BLOCK);
 576                 mmc_host_clk_release(card->host);
 577         }
 578
 579 out:
 580
 581         return err;
 582 }
 583
 584 /*
 585  * Handle the detection and initialisation of a card.
 586  *
 587  * In the case of a resume, "oldcard" will contain the card
 588  * we're trying to reinitialise.
 589  */
 590 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 591                               struct mmc_card *oldcard, int powered_resume)
 592 {
 593         struct mmc_card *card;
 594         int err;
 595         int retries = 10;
 596         u32 rocr = 0;
 597         u32 ocr_card = ocr;
 598
 599         BUG_ON(!host);
 600         WARN_ON(!host->claimed);
 601
 602         /* to query card if 1.8V signalling is supported */
 603         if (mmc_host_uhs(host))
 604                 ocr |= R4_18V_PRESENT;
 605
 606 try_again:
 607         if (!retries) {
 608                 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
 609                 ocr &= ~R4_18V_PRESENT;
 610         }
 611
 612         /*
 613          * Inform the card of the voltage
 614          */
 615         if (!powered_resume) {
 616                 err = mmc_send_io_op_cond(host, ocr, &rocr);
 617                 if (err)
 618                         goto err;
 619         }
 620
 621         /*
 622          * For SPI, enable CRC as appropriate.
 623          */
 624         if (mmc_host_is_spi(host)) {
 625                 err = mmc_spi_set_crc(host, use_spi_crc);
 626                 if (err)
 627                         goto err;
 628         }
 629
 630         /*
 631          * Allocate card structure.
 632          */
 633         card = mmc_alloc_card(host, NULL);
 634         if (IS_ERR(card)) {
 635                 err = PTR_ERR(card);
 636                 goto err;
 637         }
 638
 639         if ((rocr & R4_MEMORY_PRESENT) &&
 640             mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
 641                 card->type = MMC_TYPE_SD_COMBO;
 642
 643                 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
 644                     memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
 645                         mmc_remove_card(card);
 646                         return -ENOENT;
 647                 }
 648         } else {
 649                 card->type = MMC_TYPE_SDIO;
 650
 651                 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
 652                         mmc_remove_card(card);
 653                         return -ENOENT;
 654                 }
 655         }
 656
 657         /*
 658          * Call the optional HC's init_card function to handle quirks.
 659          */
 660         if (host->ops->init_card)
 661                 host->ops->init_card(host, card);
 662
 663         /*
 664          * If the host and card support UHS-I mode request the card
 665          * to switch to 1.8V signaling level.  No 1.8v signalling if
 666          * UHS mode is not enabled to maintain compatibility and some
 667          * systems that claim 1.8v signalling in fact do not support
 668          * it.
 669          */
 670         if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
 671                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
 672                                         ocr);
 673                 if (err == -EAGAIN) {
 674                         sdio_reset(host);
 675                         mmc_go_idle(host);
 676                         mmc_send_if_cond(host, host->ocr_avail);
 677                         mmc_remove_card(card);
 678                         retries--;
 679                         goto try_again;
 680                 } else if (err) {
 681                         ocr &= ~R4_18V_PRESENT;
 682                 }
 683                 err = 0;
 684         } else {
 685                 ocr &= ~R4_18V_PRESENT;
 686         }
 687
 688         /*
 689          * For native busses:  set card RCA and quit open drain mode.
 690          */
 691         if (!powered_resume && !mmc_host_is_spi(host)) {
 692                 err = mmc_send_relative_addr(host, &card->rca);
 693                 if (err)
 694                         goto remove;
 695
 696                 /*
 697                  * Update oldcard with the new RCA received from the SDIO
 698                  * device -- we're doing this so that it's updated in the
 699                  * "card" struct when oldcard overwrites that later.
 700                  */
 701                 if (oldcard)
 702                         oldcard->rca = card->rca;
 703         }
 704
 705         /*
 706          * Read CSD, before selecting the card
 707          */
 708         if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
 709                 err = mmc_sd_get_csd(host, card);
 710                 if (err)
 711                         return err;
 712
 713                 mmc_decode_cid(card);
 714         }
 715
 716         /*
 717          * Select card, as all following commands rely on that.
 718          */
 719         if (!powered_resume && !mmc_host_is_spi(host)) {
 720                 err = mmc_select_card(card);
 721                 if (err)
 722                         goto remove;
 723         }
 724
 725         if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
 726                 /*
 727                  * This is non-standard SDIO device, meaning it doesn't
 728                  * have any CIA (Common I/O area) registers present.
 729                  * It's host's responsibility to fill cccr and cis
 730                  * structures in init_card().
 731                  */
 732                 mmc_set_clock(host, card->cis.max_dtr);
 733
 734                 if (card->cccr.high_speed) {
 735                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 736                 }
 737
 738                 goto finish;
 739         }
 740
 741         /*
 742          * Read the common registers.
 743          */
 744         err = sdio_read_cccr(card, ocr);
 745         if (err)
 746                 goto remove;
 747
 748         /*
 749          * Read the common CIS tuples.
 750          */
 751         err = sdio_read_common_cis(card);
 752         if (err)
 753                 goto remove;
 754
 755         if (oldcard) {
 756                 int same = (card->cis.vendor == oldcard->cis.vendor &&
 757                             card->cis.device == oldcard->cis.device);
 758                 mmc_remove_card(card);
 759                 if (!same)
 760                         return -ENOENT;
 761
 762                 card = oldcard;
 763         }
 764         card->ocr = ocr_card;
 765         mmc_fixup_device(card, NULL);
 766
 767         if (card->type == MMC_TYPE_SD_COMBO) {
 768                 err = mmc_sd_setup_card(host, card, oldcard != NULL);
 769                 /* handle as SDIO-only card if memory init failed */
 770                 if (err) {
 771                         mmc_go_idle(host);
 772                         if (mmc_host_is_spi(host))
 773                                 /* should not fail, as it worked previously */
 774                                 mmc_spi_set_crc(host, use_spi_crc);
 775                         card->type = MMC_TYPE_SDIO;
 776                 } else
 777                         card->dev.type = &sd_type;
 778         }
 779
 780         /*
 781          * If needed, disconnect card detection pull-up resistor.
 782          */
 783         err = sdio_disable_cd(card);
 784         if (err)
 785                 goto remove;
 786
 787         /* Initialization sequence for UHS-I cards */
 788         /* Only if card supports 1.8v and UHS signaling */
 789         if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
 790                 err = mmc_sdio_init_uhs_card(card);
 791                 if (err)
 792                         goto remove;
 793         } else {
 794                 /*
 795                  * Switch to high-speed (if supported).
 796                  */
 797                 err = sdio_enable_hs(card);
 798                 if (err > 0)
 799                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 800                 else if (err)
 801                         goto remove;
 802
 803                 /*
 804                  * Change to the card's maximum speed.
 805                  */
 806                 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
 807
 808                 /*
 809                  * Switch to wider bus (if supported).
 810                  */
 811                 err = sdio_enable_4bit_bus(card);
 812                 if (err > 0)
 813                         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 814                 else if (err)
 815                         goto remove;
 816         }
 817 finish:
 818         if (!oldcard)
 819                 host->card = card;
 820         return 0;
 821
 822 remove:
 823         if (!oldcard)
 824                 mmc_remove_card(card);
 825
 826 err:
 827         return err;
 828 }
 829
 830 /*
 831  * Host is being removed. Free up the current card.
 832  */
 833 static void mmc_sdio_remove(struct mmc_host *host)
 834 {
 835         int i;
 836
 837         BUG_ON(!host);
 838         BUG_ON(!host->card);
 839
 840         for (i = 0;i < host->card->sdio_funcs;i++) {
 841                 if (host->card->sdio_func[i]) {
 842                         sdio_remove_func(host->card->sdio_func[i]);
 843                         host->card->sdio_func[i] = NULL;
 844                 }
 845         }
 846
 847         mmc_remove_card(host->card);
 848         host->card = NULL;
 849 }
 850
 851 /*
 852  * Card detection - card is alive.
 853  */
 854 static int mmc_sdio_alive(struct mmc_host *host)
 855 {
 856         return mmc_select_card(host->card);
 857 }
 858
 859 /*
 860  * Card detection callback from host.
 861  */
 862 static void mmc_sdio_detect(struct mmc_host *host)
 863 {
 864         int err;
 865
 866         BUG_ON(!host);
 867         BUG_ON(!host->card);
 868
 869         /* Make sure card is powered before detecting it */
 870         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 871                 err = pm_runtime_get_sync(&host->card->dev);
 872                 if (err < 0) {
 873                         pm_runtime_put_noidle(&host->card->dev);
 874                         goto out;
 875                 }
 876         }
 877
 878         mmc_claim_host(host);
 879
 880         /*
 881          * Just check if our card has been removed.
 882          */
 883         err = _mmc_detect_card_removed(host);
 884
 885         mmc_release_host(host);
 886
 887         /*
 888          * Tell PM core it's OK to power off the card now.
 889          *
 890          * The _sync variant is used in order to ensure that the card
 891          * is left powered off in case an error occurred, and the card
 892          * is going to be removed.
 893          *
 894          * Since there is no specific reason to believe a new user
 895          * is about to show up at this point, the _sync variant is
 896          * desirable anyway.
 897          */
 898         if (host->caps & MMC_CAP_POWER_OFF_CARD)
 899                 pm_runtime_put_sync(&host->card->dev);
 900
 901 out:
 902         if (err) {
 903                 mmc_sdio_remove(host);
 904
 905                 mmc_claim_host(host);
 906                 mmc_detach_bus(host);
 907                 mmc_power_off(host);
 908                 mmc_release_host(host);
 909         }
 910 }
 911
 912 /*
 913  * SDIO pre_suspend.  We need to suspend all functions separately.
 914  * Therefore all registered functions must have drivers with suspend
 915  * and resume methods.  Failing that we simply remove the whole card.
 916  */
 917 static int mmc_sdio_pre_suspend(struct mmc_host *host)
 918 {
 919         int i, err = 0;
 920
 921         for (i = 0; i < host->card->sdio_funcs; i++) {
 922                 struct sdio_func *func = host->card->sdio_func[i];
 923                 if (func && sdio_func_present(func) && func->dev.driver) {
 924                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 925                         if (!pmops || !pmops->suspend || !pmops->resume) {
 926                                 /* force removal of entire card in that case */
 927                                 err = -ENOSYS;
 928                                 break;
 929                         }
 930                 }
 931         }
 932
 933         return err;
 934 }
 935
 936 /*
 937  * SDIO suspend.  Suspend all functions separately.
 938  */
 939 static int mmc_sdio_suspend(struct mmc_host *host)
 940 {
 941         if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 942                 mmc_claim_host(host);
 943                 sdio_disable_wide(host->card);
 944                 mmc_release_host(host);
 945         }
 946
 947         if (!mmc_card_keep_power(host))
 948                 mmc_power_off(host);
 949
 950         return 0;
 951 }
 952
 953 static int mmc_sdio_resume(struct mmc_host *host)
 954 {
 955         int err = 0;
 956
 957         BUG_ON(!host);
 958         BUG_ON(!host->card);
 959
 960         /* Basic card reinitialization. */
 961         mmc_claim_host(host);
 962
 963         /* Restore power if needed */
 964         if (!mmc_card_keep_power(host)) {
 965                 mmc_power_up(host, host->card->ocr);
 966                 /*
 967                  * Tell runtime PM core we just powered up the card,
 968                  * since it still believes the card is powered off.
 969                  * Note that currently runtime PM is only enabled
 970                  * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
 971                  */
 972                 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 973                         pm_runtime_disable(&host->card->dev);
 974                         pm_runtime_set_active(&host->card->dev);
 975                         pm_runtime_enable(&host->card->dev);
 976                 }
 977         }
 978
 979         /* No need to reinitialize powered-resumed nonremovable cards */
 980         if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
 981                 sdio_reset(host);
 982                 mmc_go_idle(host);
 983                 mmc_send_if_cond(host, host->card->ocr);
 984                 err = mmc_send_io_op_cond(host, 0, NULL);
 985                 if (!err)
 986                         err = mmc_sdio_init_card(host, host->card->ocr,
 987                                                  host->card,
 988                                                  mmc_card_keep_power(host));
 989         } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 990                 /* We may have switched to 1-bit mode during suspend */
 991                 err = sdio_enable_4bit_bus(host->card);
 992                 if (err > 0) {
 993                         mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
 994                         err = 0;
 995                 }
 996         }
 997
 998         if (!err && host->sdio_irqs) {
 999                 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
1000                         wake_up_process(host->sdio_irq_thread);
1001                 } else if (host->caps & MMC_CAP_SDIO_IRQ) {
1002                         mmc_host_clk_hold(host);
1003                         host->ops->enable_sdio_irq(host, 1);
1004                         mmc_host_clk_release(host);
1005                 }
1006         }
1007
1008         mmc_release_host(host);
1009
1010         host->pm_flags &= ~MMC_PM_KEEP_POWER;
1011         return err;
1012 }
1013
1014 static int mmc_sdio_power_restore(struct mmc_host *host)
1015 {
1016         int ret;
1017
1018         BUG_ON(!host);
1019         BUG_ON(!host->card);
1020
1021         mmc_claim_host(host);
1022
1023         /*
1024          * Reset the card by performing the same steps that are taken by
1025          * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1026          *
1027          * sdio_reset() is technically not needed. Having just powered up the
1028          * hardware, it should already be in reset state. However, some
1029          * platforms (such as SD8686 on OLPC) do not instantly cut power,
1030          * meaning that a reset is required when restoring power soon after
1031          * powering off. It is harmless in other cases.
1032          *
1033          * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1034          * is not necessary for non-removable cards. However, it is required
1035          * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1036          * harmless in other situations.
1037          *
1038          */
1039
1040         sdio_reset(host);
1041         mmc_go_idle(host);
1042         mmc_send_if_cond(host, host->card->ocr);
1043
1044         ret = mmc_send_io_op_cond(host, 0, NULL);
1045         if (ret)
1046                 goto out;
1047
1048         ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1049                                 mmc_card_keep_power(host));
1050         if (!ret && host->sdio_irqs)
1051                 mmc_signal_sdio_irq(host);
1052
1053 out:
1054         mmc_release_host(host);
1055
1056         return ret;
1057 }
1058
1059 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1060 {
1061         /* No references to the card, cut the power to it. */
1062         mmc_power_off(host);
1063         return 0;
1064 }
1065
1066 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1067 {
1068         /* Restore power and re-initialize. */
1069         mmc_power_up(host, host->card->ocr);
1070         return mmc_sdio_power_restore(host);
1071 }
1072
1073 static const struct mmc_bus_ops mmc_sdio_ops = {
1074         .remove = mmc_sdio_remove,
1075         .detect = mmc_sdio_detect,
1076         .pre_suspend = mmc_sdio_pre_suspend,
1077         .suspend = mmc_sdio_suspend,
1078         .resume = mmc_sdio_resume,
1079         .runtime_suspend = mmc_sdio_runtime_suspend,
1080         .runtime_resume = mmc_sdio_runtime_resume,
1081         .power_restore = mmc_sdio_power_restore,
1082         .alive = mmc_sdio_alive,
1083 };
1084
1085
1086 /*
1087  * Starting point for SDIO card init.
1088  */
1089 int mmc_attach_sdio(struct mmc_host *host)
1090 {
1091         int err, i, funcs;
1092         u32 ocr, rocr;
1093         struct mmc_card *card;
1094
1095         BUG_ON(!host);
1096         WARN_ON(!host->claimed);
1097
1098         err = mmc_send_io_op_cond(host, 0, &ocr);
1099         if (err)
1100                 return err;
1101
1102         mmc_attach_bus(host, &mmc_sdio_ops);
1103         if (host->ocr_avail_sdio)
1104                 host->ocr_avail = host->ocr_avail_sdio;
1105
1106
1107         rocr = mmc_select_voltage(host, ocr);
1108
1109         /*
1110          * Can we support the voltage(s) of the card(s)?
1111          */
1112         if (!rocr) {
1113                 err = -EINVAL;
1114                 goto err;
1115         }
1116
1117         /*
1118          * Detect and init the card.
1119          */
1120         err = mmc_sdio_init_card(host, rocr, NULL, 0);
1121         if (err)
1122                 goto err;
1123
1124         card = host->card;
1125
1126         /*
1127          * Enable runtime PM only if supported by host+card+board
1128          */
1129         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1130                 /*
1131                  * Let runtime PM core know our card is active
1132                  */
1133                 err = pm_runtime_set_active(&card->dev);
1134                 if (err)
1135                         goto remove;
1136
1137                 /*
1138                  * Enable runtime PM for this card
1139                  */
1140                 pm_runtime_enable(&card->dev);
1141         }
1142
1143         /*
1144          * The number of functions on the card is encoded inside
1145          * the ocr.
1146          */
1147         funcs = (ocr & 0x70000000) >> 28;
1148         card->sdio_funcs = 0;
1149
1150         /*
1151          * Initialize (but don't add) all present functions.
1152          */
1153         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1154                 err = sdio_init_func(host->card, i + 1);
1155                 if (err)
1156                         goto remove;
1157
1158                 /*
1159                  * Enable Runtime PM for this func (if supported)
1160                  */
1161                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1162                         pm_runtime_enable(&card->sdio_func[i]->dev);
1163         }
1164
1165         /*
1166          * First add the card to the driver model...
1167          */
1168         mmc_release_host(host);
1169         err = mmc_add_card(host->card);
1170         if (err)
1171                 goto remove_added;
1172
1173         /*
1174          * ...then the SDIO functions.
1175          */
1176         for (i = 0;i < funcs;i++) {
1177                 err = sdio_add_func(host->card->sdio_func[i]);
1178                 if (err)
1179                         goto remove_added;
1180         }
1181
1182         mmc_claim_host(host);
1183         return 0;
1184
1185
1186 remove_added:
1187         /* Remove without lock if the device has been added. */
1188         mmc_sdio_remove(host);
1189         mmc_claim_host(host);
1190 remove:
1191         /* And with lock if it hasn't been added. */
1192         mmc_release_host(host);
1193         if (host->card)
1194                 mmc_sdio_remove(host);
1195         mmc_claim_host(host);
1196 err:
1197         mmc_detach_bus(host);
1198
1199         pr_err("%s: error %d whilst initialising SDIO card\n",
1200                 mmc_hostname(host), err);
1201
1202         return err;
1203 }
1204