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_warning("%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_highspeed(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         /* Initialize and start re-tuning timer */
 567         if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
 568                 err = card->host->ops->execute_tuning(card->host,
 569                                                       MMC_SEND_TUNING_BLOCK);
 570
 571 out:
 572
 573         return err;
 574 }
 575
 576 /*
 577  * Handle the detection and initialisation of a card.
 578  *
 579  * In the case of a resume, "oldcard" will contain the card
 580  * we're trying to reinitialise.
 581  */
 582 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 583                               struct mmc_card *oldcard, int powered_resume)
 584 {
 585         struct mmc_card *card;
 586         int err;
 587
 588         BUG_ON(!host);
 589         WARN_ON(!host->claimed);
 590
 591         /*
 592          * Inform the card of the voltage
 593          */
 594         if (!powered_resume) {
 595                 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
 596                 if (err)
 597                         goto err;
 598         }
 599
 600         /*
 601          * For SPI, enable CRC as appropriate.
 602          */
 603         if (mmc_host_is_spi(host)) {
 604                 err = mmc_spi_set_crc(host, use_spi_crc);
 605                 if (err)
 606                         goto err;
 607         }
 608
 609         /*
 610          * Allocate card structure.
 611          */
 612         card = mmc_alloc_card(host, NULL);
 613         if (IS_ERR(card)) {
 614                 err = PTR_ERR(card);
 615                 goto err;
 616         }
 617
 618         if ((ocr & R4_MEMORY_PRESENT) &&
 619             mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
 620                 card->type = MMC_TYPE_SD_COMBO;
 621
 622                 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
 623                     memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
 624                         mmc_remove_card(card);
 625                         return -ENOENT;
 626                 }
 627         } else {
 628                 card->type = MMC_TYPE_SDIO;
 629
 630                 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
 631                         mmc_remove_card(card);
 632                         return -ENOENT;
 633                 }
 634         }
 635
 636         /*
 637          * Call the optional HC's init_card function to handle quirks.
 638          */
 639         if (host->ops->init_card)
 640                 host->ops->init_card(host, card);
 641
 642         /*
 643          * If the host and card support UHS-I mode request the card
 644          * to switch to 1.8V signaling level.  No 1.8v signalling if
 645          * UHS mode is not enabled to maintain compatibility and some
 646          * systems that claim 1.8v signalling in fact do not support
 647          * it.
 648          */
 649         if ((ocr & R4_18V_PRESENT) && mmc_host_uhs(host)) {
 650                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
 651                                 true);
 652                 if (err) {
 653                         ocr &= ~R4_18V_PRESENT;
 654                         host->ocr &= ~R4_18V_PRESENT;
 655                 }
 656                 err = 0;
 657         } else {
 658                 ocr &= ~R4_18V_PRESENT;
 659                 host->ocr &= ~R4_18V_PRESENT;
 660         }
 661
 662         /*
 663          * For native busses:  set card RCA and quit open drain mode.
 664          */
 665         if (!powered_resume && !mmc_host_is_spi(host)) {
 666                 err = mmc_send_relative_addr(host, &card->rca);
 667                 if (err)
 668                         goto remove;
 669
 670                 /*
 671                  * Update oldcard with the new RCA received from the SDIO
 672                  * device -- we're doing this so that it's updated in the
 673                  * "card" struct when oldcard overwrites that later.
 674                  */
 675                 if (oldcard)
 676                         oldcard->rca = card->rca;
 677         }
 678
 679         /*
 680          * Read CSD, before selecting the card
 681          */
 682         if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
 683                 err = mmc_sd_get_csd(host, card);
 684                 if (err)
 685                         return err;
 686
 687                 mmc_decode_cid(card);
 688         }
 689
 690         /*
 691          * Select card, as all following commands rely on that.
 692          */
 693         if (!powered_resume && !mmc_host_is_spi(host)) {
 694                 err = mmc_select_card(card);
 695                 if (err)
 696                         goto remove;
 697         }
 698
 699         if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
 700                 /*
 701                  * This is non-standard SDIO device, meaning it doesn't
 702                  * have any CIA (Common I/O area) registers present.
 703                  * It's host's responsibility to fill cccr and cis
 704                  * structures in init_card().
 705                  */
 706                 mmc_set_clock(host, card->cis.max_dtr);
 707
 708                 if (card->cccr.high_speed) {
 709                         mmc_card_set_highspeed(card);
 710                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 711                 }
 712
 713                 goto finish;
 714         }
 715
 716         /*
 717          * Read the common registers.
 718          */
 719         err = sdio_read_cccr(card, ocr);
 720         if (err)
 721                 goto remove;
 722
 723         /*
 724          * Read the common CIS tuples.
 725          */
 726         err = sdio_read_common_cis(card);
 727         if (err)
 728                 goto remove;
 729
 730         if (oldcard) {
 731                 int same = (card->cis.vendor == oldcard->cis.vendor &&
 732                             card->cis.device == oldcard->cis.device);
 733                 mmc_remove_card(card);
 734                 if (!same)
 735                         return -ENOENT;
 736
 737                 card = oldcard;
 738         }
 739         mmc_fixup_device(card, NULL);
 740
 741         if (card->type == MMC_TYPE_SD_COMBO) {
 742                 err = mmc_sd_setup_card(host, card, oldcard != NULL);
 743                 /* handle as SDIO-only card if memory init failed */
 744                 if (err) {
 745                         mmc_go_idle(host);
 746                         if (mmc_host_is_spi(host))
 747                                 /* should not fail, as it worked previously */
 748                                 mmc_spi_set_crc(host, use_spi_crc);
 749                         card->type = MMC_TYPE_SDIO;
 750                 } else
 751                         card->dev.type = &sd_type;
 752         }
 753
 754         /*
 755          * If needed, disconnect card detection pull-up resistor.
 756          */
 757         err = sdio_disable_cd(card);
 758         if (err)
 759                 goto remove;
 760
 761         /* Initialization sequence for UHS-I cards */
 762         /* Only if card supports 1.8v and UHS signaling */
 763         if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
 764                 err = mmc_sdio_init_uhs_card(card);
 765                 if (err)
 766                         goto remove;
 767
 768                 /* Card is an ultra-high-speed card */
 769                 mmc_card_set_uhs(card);
 770         } else {
 771                 /*
 772                  * Switch to high-speed (if supported).
 773                  */
 774                 err = sdio_enable_hs(card);
 775                 if (err > 0)
 776                         mmc_sd_go_highspeed(card);
 777                 else if (err)
 778                         goto remove;
 779
 780                 /*
 781                  * Change to the card's maximum speed.
 782                  */
 783                 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
 784
 785                 /*
 786                  * Switch to wider bus (if supported).
 787                  */
 788                 err = sdio_enable_4bit_bus(card);
 789                 if (err > 0)
 790                         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 791                 else if (err)
 792                         goto remove;
 793         }
 794 finish:
 795         if (!oldcard)
 796                 host->card = card;
 797         return 0;
 798
 799 remove:
 800         if (!oldcard)
 801                 mmc_remove_card(card);
 802
 803 err:
 804         return err;
 805 }
 806
 807 /*
 808  * Host is being removed. Free up the current card.
 809  */
 810 static void mmc_sdio_remove(struct mmc_host *host)
 811 {
 812         int i;
 813
 814         BUG_ON(!host);
 815         BUG_ON(!host->card);
 816
 817         for (i = 0;i < host->card->sdio_funcs;i++) {
 818                 if (host->card->sdio_func[i]) {
 819                         sdio_remove_func(host->card->sdio_func[i]);
 820                         host->card->sdio_func[i] = NULL;
 821                 }
 822         }
 823
 824         mmc_remove_card(host->card);
 825         host->card = NULL;
 826 }
 827
 828 /*
 829  * Card detection - card is alive.
 830  */
 831 static int mmc_sdio_alive(struct mmc_host *host)
 832 {
 833         return mmc_select_card(host->card);
 834 }
 835
 836 /*
 837  * Card detection callback from host.
 838  */
 839 static void mmc_sdio_detect(struct mmc_host *host)
 840 {
 841         int err;
 842
 843         BUG_ON(!host);
 844         BUG_ON(!host->card);
 845
 846         /* Make sure card is powered before detecting it */
 847         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 848                 err = pm_runtime_get_sync(&host->card->dev);
 849                 if (err < 0)
 850                         goto out;
 851         }
 852
 853         mmc_claim_host(host);
 854
 855         /*
 856          * Just check if our card has been removed.
 857          */
 858         err = _mmc_detect_card_removed(host);
 859
 860         mmc_release_host(host);
 861
 862         /*
 863          * Tell PM core it's OK to power off the card now.
 864          *
 865          * The _sync variant is used in order to ensure that the card
 866          * is left powered off in case an error occurred, and the card
 867          * is going to be removed.
 868          *
 869          * Since there is no specific reason to believe a new user
 870          * is about to show up at this point, the _sync variant is
 871          * desirable anyway.
 872          */
 873         if (host->caps & MMC_CAP_POWER_OFF_CARD)
 874                 pm_runtime_put_sync(&host->card->dev);
 875
 876 out:
 877         if (err) {
 878                 mmc_sdio_remove(host);
 879
 880                 mmc_claim_host(host);
 881                 mmc_detach_bus(host);
 882                 mmc_power_off(host);
 883                 mmc_release_host(host);
 884         }
 885 }
 886
 887 /*
 888  * SDIO suspend.  We need to suspend all functions separately.
 889  * Therefore all registered functions must have drivers with suspend
 890  * and resume methods.  Failing that we simply remove the whole card.
 891  */
 892 static int mmc_sdio_suspend(struct mmc_host *host)
 893 {
 894         int i, err = 0;
 895
 896         for (i = 0; i < host->card->sdio_funcs; i++) {
 897                 struct sdio_func *func = host->card->sdio_func[i];
 898                 if (func && sdio_func_present(func) && func->dev.driver) {
 899                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 900                         if (!pmops || !pmops->suspend || !pmops->resume) {
 901                                 /* force removal of entire card in that case */
 902                                 err = -ENOSYS;
 903                         } else
 904                                 err = pmops->suspend(&func->dev);
 905                         if (err)
 906                                 break;
 907                 }
 908         }
 909         while (err && --i >= 0) {
 910                 struct sdio_func *func = host->card->sdio_func[i];
 911                 if (func && sdio_func_present(func) && func->dev.driver) {
 912                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 913                         pmops->resume(&func->dev);
 914                 }
 915         }
 916
 917         if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 918                 mmc_claim_host(host);
 919                 sdio_disable_wide(host->card);
 920                 mmc_release_host(host);
 921         }
 922
 923         return err;
 924 }
 925
 926 static int mmc_sdio_resume(struct mmc_host *host)
 927 {
 928         int i, err = 0;
 929
 930         BUG_ON(!host);
 931         BUG_ON(!host->card);
 932
 933         /* Basic card reinitialization. */
 934         mmc_claim_host(host);
 935
 936         /* No need to reinitialize powered-resumed nonremovable cards */
 937         if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
 938                 sdio_reset(host);
 939                 mmc_go_idle(host);
 940                 err = mmc_sdio_init_card(host, host->ocr, 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                 if (err > 0) {
 946                         mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
 947                         err = 0;
 948                 }
 949         }
 950
 951         if (!err && host->sdio_irqs)
 952                 wake_up_process(host->sdio_irq_thread);
 953         mmc_release_host(host);
 954
 955         /*
 956          * If the card looked to be the same as before suspending, then
 957          * we proceed to resume all card functions.  If one of them returns
 958          * an error then we simply return that error to the core and the
 959          * card will be redetected as new.  It is the responsibility of
 960          * the function driver to perform further tests with the extra
 961          * knowledge it has of the card to confirm the card is indeed the
 962          * same as before suspending (same MAC address for network cards,
 963          * etc.) and return an error otherwise.
 964          */
 965         for (i = 0; !err && i < host->card->sdio_funcs; i++) {
 966                 struct sdio_func *func = host->card->sdio_func[i];
 967                 if (func && sdio_func_present(func) && func->dev.driver) {
 968                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 969                         err = pmops->resume(&func->dev);
 970                 }
 971         }
 972
 973         return err;
 974 }
 975
 976 static int mmc_sdio_power_restore(struct mmc_host *host)
 977 {
 978         int ret;
 979         u32 ocr;
 980
 981         BUG_ON(!host);
 982         BUG_ON(!host->card);
 983
 984         mmc_claim_host(host);
 985
 986         /*
 987          * Reset the card by performing the same steps that are taken by
 988          * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
 989          *
 990          * sdio_reset() is technically not needed. Having just powered up the
 991          * hardware, it should already be in reset state. However, some
 992          * platforms (such as SD8686 on OLPC) do not instantly cut power,
 993          * meaning that a reset is required when restoring power soon after
 994          * powering off. It is harmless in other cases.
 995          *
 996          * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
 997          * is not necessary for non-removable cards. However, it is required
 998          * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
 999          * harmless in other situations.
1000          *
1001          * With these steps taken, mmc_select_voltage() is also required to
1002          * restore the correct voltage setting of the card.
1003          */
1004
1005         sdio_reset(host);
1006         mmc_go_idle(host);
1007         mmc_send_if_cond(host, host->ocr_avail);
1008
1009         ret = mmc_send_io_op_cond(host, 0, &ocr);
1010         if (ret)
1011                 goto out;
1012
1013         if (host->ocr_avail_sdio)
1014                 host->ocr_avail = host->ocr_avail_sdio;
1015
1016         host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1017         if (!host->ocr) {
1018                 ret = -EINVAL;
1019                 goto out;
1020         }
1021
1022         if (mmc_host_uhs(host))
1023                 /* to query card if 1.8V signalling is supported */
1024                 host->ocr |= R4_18V_PRESENT;
1025
1026         ret = mmc_sdio_init_card(host, host->ocr, host->card,
1027                                 mmc_card_keep_power(host));
1028         if (!ret && host->sdio_irqs)
1029                 mmc_signal_sdio_irq(host);
1030
1031 out:
1032         mmc_release_host(host);
1033
1034         return ret;
1035 }
1036
1037 static const struct mmc_bus_ops mmc_sdio_ops = {
1038         .remove = mmc_sdio_remove,
1039         .detect = mmc_sdio_detect,
1040         .suspend = mmc_sdio_suspend,
1041         .resume = mmc_sdio_resume,
1042         .power_restore = mmc_sdio_power_restore,
1043         .alive = mmc_sdio_alive,
1044 };
1045
1046
1047 /*
1048  * Starting point for SDIO card init.
1049  */
1050 int mmc_attach_sdio(struct mmc_host *host)
1051 {
1052         int err, i, funcs;
1053         u32 ocr;
1054         struct mmc_card *card;
1055
1056         BUG_ON(!host);
1057         WARN_ON(!host->claimed);
1058
1059         err = mmc_send_io_op_cond(host, 0, &ocr);
1060         if (err)
1061                 return err;
1062
1063         mmc_attach_bus(host, &mmc_sdio_ops);
1064         if (host->ocr_avail_sdio)
1065                 host->ocr_avail = host->ocr_avail_sdio;
1066
1067         /*
1068          * Sanity check the voltages that the card claims to
1069          * support.
1070          */
1071         if (ocr & 0x7F) {
1072                 pr_warning("%s: card claims to support voltages "
1073                        "below the defined range. These will be ignored.\n",
1074                        mmc_hostname(host));
1075                 ocr &= ~0x7F;
1076         }
1077
1078         host->ocr = mmc_select_voltage(host, ocr);
1079
1080         /*
1081          * Can we support the voltage(s) of the card(s)?
1082          */
1083         if (!host->ocr) {
1084                 err = -EINVAL;
1085                 goto err;
1086         }
1087
1088         /*
1089          * Detect and init the card.
1090          */
1091         if (mmc_host_uhs(host))
1092                 /* to query card if 1.8V signalling is supported */
1093                 host->ocr |= R4_18V_PRESENT;
1094
1095         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1096         if (err) {
1097                 if (err == -EAGAIN) {
1098                         /*
1099                          * Retry initialization with S18R set to 0.
1100                          */
1101                         host->ocr &= ~R4_18V_PRESENT;
1102                         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1103                 }
1104                 if (err)
1105                         goto err;
1106         }
1107         card = host->card;
1108
1109         /*
1110          * Enable runtime PM only if supported by host+card+board
1111          */
1112         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1113                 /*
1114                  * Let runtime PM core know our card is active
1115                  */
1116                 err = pm_runtime_set_active(&card->dev);
1117                 if (err)
1118                         goto remove;
1119
1120                 /*
1121                  * Enable runtime PM for this card
1122                  */
1123                 pm_runtime_enable(&card->dev);
1124         }
1125
1126         /*
1127          * The number of functions on the card is encoded inside
1128          * the ocr.
1129          */
1130         funcs = (ocr & 0x70000000) >> 28;
1131         card->sdio_funcs = 0;
1132
1133         /*
1134          * Initialize (but don't add) all present functions.
1135          */
1136         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1137                 err = sdio_init_func(host->card, i + 1);
1138                 if (err)
1139                         goto remove;
1140
1141                 /*
1142                  * Enable Runtime PM for this func (if supported)
1143                  */
1144                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1145                         pm_runtime_enable(&card->sdio_func[i]->dev);
1146         }
1147
1148         /*
1149          * First add the card to the driver model...
1150          */
1151         mmc_release_host(host);
1152         err = mmc_add_card(host->card);
1153         if (err)
1154                 goto remove_added;
1155
1156         /*
1157          * ...then the SDIO functions.
1158          */
1159         for (i = 0;i < funcs;i++) {
1160                 err = sdio_add_func(host->card->sdio_func[i]);
1161                 if (err)
1162                         goto remove_added;
1163         }
1164
1165         mmc_claim_host(host);
1166         return 0;
1167
1168
1169 remove_added:
1170         /* Remove without lock if the device has been added. */
1171         mmc_sdio_remove(host);
1172         mmc_claim_host(host);
1173 remove:
1174         /* And with lock if it hasn't been added. */
1175         mmc_release_host(host);
1176         if (host->card)
1177                 mmc_sdio_remove(host);
1178         mmc_claim_host(host);
1179 err:
1180         mmc_detach_bus(host);
1181
1182         pr_err("%s: error %d whilst initialising SDIO card\n",
1183                 mmc_hostname(host), err);
1184
1185         return err;
1186 }
1187