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 "card.h"
  24 #include "host.h"
  25 #include "bus.h"
  26 #include "quirks.h"
  27 #include "sd.h"
  28 #include "sdio_bus.h"
  29 #include "mmc_ops.h"
  30 #include "sd_ops.h"
  31 #include "sdio_ops.h"
  32 #include "sdio_cis.h"
  33
  34 static int sdio_read_fbr(struct sdio_func *func)
  35 {
  36         int ret;
  37         unsigned char data;
  38
  39         if (mmc_card_nonstd_func_interface(func->card)) {
  40                 func->class = SDIO_CLASS_NONE;
  41                 return 0;
  42         }
  43
  44         ret = mmc_io_rw_direct(func->card, 0, 0,
  45                 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
  46         if (ret)
  47                 goto out;
  48
  49         data &= 0x0f;
  50
  51         if (data == 0x0f) {
  52                 ret = mmc_io_rw_direct(func->card, 0, 0,
  53                         SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
  54                 if (ret)
  55                         goto out;
  56         }
  57
  58         func->class = data;
  59
  60 out:
  61         return ret;
  62 }
  63
  64 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
  65 {
  66         int ret;
  67         struct sdio_func *func;
  68
  69         if (WARN_ON(fn > SDIO_MAX_FUNCS))
  70                 return -EINVAL;
  71
  72         func = sdio_alloc_func(card);
  73         if (IS_ERR(func))
  74                 return PTR_ERR(func);
  75
  76         func->num = fn;
  77
  78         if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
  79                 ret = sdio_read_fbr(func);
  80                 if (ret)
  81                         goto fail;
  82
  83                 ret = sdio_read_func_cis(func);
  84                 if (ret)
  85                         goto fail;
  86         } else {
  87                 func->vendor = func->card->cis.vendor;
  88                 func->device = func->card->cis.device;
  89                 func->max_blksize = func->card->cis.blksize;
  90         }
  91
  92         card->sdio_func[fn - 1] = func;
  93
  94         return 0;
  95
  96 fail:
  97         /*
  98          * It is okay to remove the function here even though we hold
  99          * the host lock as we haven't registered the device yet.
 100          */
 101         sdio_remove_func(func);
 102         return ret;
 103 }
 104
 105 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
 106 {
 107         int ret;
 108         int cccr_vsn;
 109         int uhs = ocr & R4_18V_PRESENT;
 110         unsigned char data;
 111         unsigned char speed;
 112
 113         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
 114         if (ret)
 115                 goto out;
 116
 117         cccr_vsn = data & 0x0f;
 118
 119         if (cccr_vsn > SDIO_CCCR_REV_3_00) {
 120                 pr_err("%s: unrecognised CCCR structure version %d\n",
 121                         mmc_hostname(card->host), cccr_vsn);
 122                 return -EINVAL;
 123         }
 124
 125         card->cccr.sdio_vsn = (data & 0xf0) >> 4;
 126
 127         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
 128         if (ret)
 129                 goto out;
 130
 131         if (data & SDIO_CCCR_CAP_SMB)
 132                 card->cccr.multi_block = 1;
 133         if (data & SDIO_CCCR_CAP_LSC)
 134                 card->cccr.low_speed = 1;
 135         if (data & SDIO_CCCR_CAP_4BLS)
 136                 card->cccr.wide_bus = 1;
 137
 138         if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
 139                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
 140                 if (ret)
 141                         goto out;
 142
 143                 if (data & SDIO_POWER_SMPC)
 144                         card->cccr.high_power = 1;
 145         }
 146
 147         if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
 148                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 149                 if (ret)
 150                         goto out;
 151
 152                 card->scr.sda_spec3 = 0;
 153                 card->sw_caps.sd3_bus_mode = 0;
 154                 card->sw_caps.sd3_drv_type = 0;
 155                 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
 156                         card->scr.sda_spec3 = 1;
 157                         ret = mmc_io_rw_direct(card, 0, 0,
 158                                 SDIO_CCCR_UHS, 0, &data);
 159                         if (ret)
 160                                 goto out;
 161
 162                         if (mmc_host_uhs(card->host)) {
 163                                 if (data & SDIO_UHS_DDR50)
 164                                         card->sw_caps.sd3_bus_mode
 165                                                 |= SD_MODE_UHS_DDR50;
 166
 167                                 if (data & SDIO_UHS_SDR50)
 168                                         card->sw_caps.sd3_bus_mode
 169                                                 |= SD_MODE_UHS_SDR50;
 170
 171                                 if (data & SDIO_UHS_SDR104)
 172                                         card->sw_caps.sd3_bus_mode
 173                                                 |= SD_MODE_UHS_SDR104;
 174                         }
 175
 176                         ret = mmc_io_rw_direct(card, 0, 0,
 177                                 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
 178                         if (ret)
 179                                 goto out;
 180
 181                         if (data & SDIO_DRIVE_SDTA)
 182                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
 183                         if (data & SDIO_DRIVE_SDTC)
 184                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
 185                         if (data & SDIO_DRIVE_SDTD)
 186                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
 187                 }
 188
 189                 /* if no uhs mode ensure we check for high speed */
 190                 if (!card->sw_caps.sd3_bus_mode) {
 191                         if (speed & SDIO_SPEED_SHS) {
 192                                 card->cccr.high_speed = 1;
 193                                 card->sw_caps.hs_max_dtr = 50000000;
 194                         } else {
 195                                 card->cccr.high_speed = 0;
 196                                 card->sw_caps.hs_max_dtr = 25000000;
 197                         }
 198                 }
 199         }
 200
 201 out:
 202         return ret;
 203 }
 204
 205 static int sdio_enable_wide(struct mmc_card *card)
 206 {
 207         int ret;
 208         u8 ctrl;
 209
 210         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 211                 return 0;
 212
 213         if (card->cccr.low_speed && !card->cccr.wide_bus)
 214                 return 0;
 215
 216         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 217         if (ret)
 218                 return ret;
 219
 220         if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
 221                 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
 222                         mmc_hostname(card->host), ctrl);
 223
 224         /* set as 4-bit bus width */
 225         ctrl &= ~SDIO_BUS_WIDTH_MASK;
 226         ctrl |= SDIO_BUS_WIDTH_4BIT;
 227
 228         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 229         if (ret)
 230                 return ret;
 231
 232         return 1;
 233 }
 234
 235 /*
 236  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
 237  * of the card. This may be required on certain setups of boards,
 238  * controllers and embedded sdio device which do not need the card's
 239  * pull-up. As a result, card detection is disabled and power is saved.
 240  */
 241 static int sdio_disable_cd(struct mmc_card *card)
 242 {
 243         int ret;
 244         u8 ctrl;
 245
 246         if (!mmc_card_disable_cd(card))
 247                 return 0;
 248
 249         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 250         if (ret)
 251                 return ret;
 252
 253         ctrl |= SDIO_BUS_CD_DISABLE;
 254
 255         return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 256 }
 257
 258 /*
 259  * Devices that remain active during a system suspend are
 260  * put back into 1-bit mode.
 261  */
 262 static int sdio_disable_wide(struct mmc_card *card)
 263 {
 264         int ret;
 265         u8 ctrl;
 266
 267         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 268                 return 0;
 269
 270         if (card->cccr.low_speed && !card->cccr.wide_bus)
 271                 return 0;
 272
 273         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 274         if (ret)
 275                 return ret;
 276
 277         if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
 278                 return 0;
 279
 280         ctrl &= ~SDIO_BUS_WIDTH_4BIT;
 281         ctrl |= SDIO_BUS_ASYNC_INT;
 282
 283         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 284         if (ret)
 285                 return ret;
 286
 287         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
 288
 289         return 0;
 290 }
 291
 292
 293 static int sdio_enable_4bit_bus(struct mmc_card *card)
 294 {
 295         int err;
 296
 297         if (card->type == MMC_TYPE_SDIO)
 298                 err = sdio_enable_wide(card);
 299         else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
 300                  (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 301                 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 302                 if (err)
 303                         return err;
 304                 err = sdio_enable_wide(card);
 305                 if (err <= 0)
 306                         mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
 307         } else
 308                 return 0;
 309
 310         if (err > 0) {
 311                 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 312                 err = 0;
 313         }
 314
 315         return err;
 316 }
 317
 318
 319 /*
 320  * Test if the card supports high-speed mode and, if so, switch to it.
 321  */
 322 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
 323 {
 324         int ret;
 325         u8 speed;
 326
 327         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
 328                 return 0;
 329
 330         if (!card->cccr.high_speed)
 331                 return 0;
 332
 333         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 334         if (ret)
 335                 return ret;
 336
 337         if (enable)
 338                 speed |= SDIO_SPEED_EHS;
 339         else
 340                 speed &= ~SDIO_SPEED_EHS;
 341
 342         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 343         if (ret)
 344                 return ret;
 345
 346         return 1;
 347 }
 348
 349 /*
 350  * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
 351  */
 352 static int sdio_enable_hs(struct mmc_card *card)
 353 {
 354         int ret;
 355
 356         ret = mmc_sdio_switch_hs(card, true);
 357         if (ret <= 0 || card->type == MMC_TYPE_SDIO)
 358                 return ret;
 359
 360         ret = mmc_sd_switch_hs(card);
 361         if (ret <= 0)
 362                 mmc_sdio_switch_hs(card, false);
 363
 364         return ret;
 365 }
 366
 367 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
 368 {
 369         unsigned max_dtr;
 370
 371         if (mmc_card_hs(card)) {
 372                 /*
 373                  * The SDIO specification doesn't mention how
 374                  * the CIS transfer speed register relates to
 375                  * high-speed, but it seems that 50 MHz is
 376                  * mandatory.
 377                  */
 378                 max_dtr = 50000000;
 379         } else {
 380                 max_dtr = card->cis.max_dtr;
 381         }
 382
 383         if (card->type == MMC_TYPE_SD_COMBO)
 384                 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
 385
 386         return max_dtr;
 387 }
 388
 389 static unsigned char host_drive_to_sdio_drive(int host_strength)
 390 {
 391         switch (host_strength) {
 392         case MMC_SET_DRIVER_TYPE_A:
 393                 return SDIO_DTSx_SET_TYPE_A;
 394         case MMC_SET_DRIVER_TYPE_B:
 395                 return SDIO_DTSx_SET_TYPE_B;
 396         case MMC_SET_DRIVER_TYPE_C:
 397                 return SDIO_DTSx_SET_TYPE_C;
 398         case MMC_SET_DRIVER_TYPE_D:
 399                 return SDIO_DTSx_SET_TYPE_D;
 400         default:
 401                 return SDIO_DTSx_SET_TYPE_B;
 402         }
 403 }
 404
 405 static void sdio_select_driver_type(struct mmc_card *card)
 406 {
 407         int card_drv_type, drive_strength, drv_type;
 408         unsigned char card_strength;
 409         int err;
 410
 411         card->drive_strength = 0;
 412
 413         card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
 414
 415         drive_strength = mmc_select_drive_strength(card,
 416                                                    card->sw_caps.uhs_max_dtr,
 417                                                    card_drv_type, &drv_type);
 418
 419         if (drive_strength) {
 420                 /* if error just use default for drive strength B */
 421                 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
 422                                        &card_strength);
 423                 if (err)
 424                         return;
 425
 426                 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
 427                 card_strength |= host_drive_to_sdio_drive(drive_strength);
 428
 429                 /* if error default to drive strength B */
 430                 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
 431                                        card_strength, NULL);
 432                 if (err)
 433                         return;
 434                 card->drive_strength = drive_strength;
 435         }
 436
 437         if (drv_type)
 438                 mmc_set_driver_type(card->host, drv_type);
 439 }
 440
 441
 442 static int sdio_set_bus_speed_mode(struct mmc_card *card)
 443 {
 444         unsigned int bus_speed, timing;
 445         int err;
 446         unsigned char speed;
 447
 448         /*
 449          * If the host doesn't support any of the UHS-I modes, fallback on
 450          * default speed.
 451          */
 452         if (!mmc_host_uhs(card->host))
 453                 return 0;
 454
 455         bus_speed = SDIO_SPEED_SDR12;
 456         timing = MMC_TIMING_UHS_SDR12;
 457         if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
 458             (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
 459                         bus_speed = SDIO_SPEED_SDR104;
 460                         timing = MMC_TIMING_UHS_SDR104;
 461                         card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
 462                         card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
 463         } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
 464                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
 465                         bus_speed = SDIO_SPEED_DDR50;
 466                         timing = MMC_TIMING_UHS_DDR50;
 467                         card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
 468                         card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
 469         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 470                     MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
 471                     SD_MODE_UHS_SDR50)) {
 472                         bus_speed = SDIO_SPEED_SDR50;
 473                         timing = MMC_TIMING_UHS_SDR50;
 474                         card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
 475                         card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
 476         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 477                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
 478                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
 479                         bus_speed = SDIO_SPEED_SDR25;
 480                         timing = MMC_TIMING_UHS_SDR25;
 481                         card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
 482                         card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
 483         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 484                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
 485                     MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
 486                     SD_MODE_UHS_SDR12)) {
 487                         bus_speed = SDIO_SPEED_SDR12;
 488                         timing = MMC_TIMING_UHS_SDR12;
 489                         card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
 490                         card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
 491         }
 492
 493         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 494         if (err)
 495                 return err;
 496
 497         speed &= ~SDIO_SPEED_BSS_MASK;
 498         speed |= bus_speed;
 499         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 500         if (err)
 501                 return err;
 502
 503         if (bus_speed) {
 504                 mmc_set_timing(card->host, timing);
 505                 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
 506         }
 507
 508         return 0;
 509 }
 510
 511 /*
 512  * UHS-I specific initialization procedure
 513  */
 514 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
 515 {
 516         int err;
 517
 518         if (!card->scr.sda_spec3)
 519                 return 0;
 520
 521         /*
 522          * Switch to wider bus (if supported).
 523          */
 524         if (card->host->caps & MMC_CAP_4_BIT_DATA)
 525                 err = sdio_enable_4bit_bus(card);
 526
 527         /* Set the driver strength for the card */
 528         sdio_select_driver_type(card);
 529
 530         /* Set bus speed mode of the card */
 531         err = sdio_set_bus_speed_mode(card);
 532         if (err)
 533                 goto out;
 534
 535         /*
 536          * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
 537          * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
 538          */
 539         if (!mmc_host_is_spi(card->host) &&
 540             ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
 541               (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
 542                 err = mmc_execute_tuning(card);
 543 out:
 544         return err;
 545 }
 546
 547 static void mmc_sdio_resend_if_cond(struct mmc_host *host,
 548                                     struct mmc_card *card)
 549 {
 550         sdio_reset(host);
 551         mmc_go_idle(host);
 552         mmc_send_if_cond(host, host->ocr_avail);
 553         mmc_remove_card(card);
 554 }
 555
 556 /*
 557  * Handle the detection and initialisation of a card.
 558  *
 559  * In the case of a resume, "oldcard" will contain the card
 560  * we're trying to reinitialise.
 561  */
 562 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 563                               struct mmc_card *oldcard, int powered_resume)
 564 {
 565         struct mmc_card *card;
 566         int err;
 567         int retries = 10;
 568         u32 rocr = 0;
 569         u32 ocr_card = ocr;
 570
 571         WARN_ON(!host->claimed);
 572
 573         /* to query card if 1.8V signalling is supported */
 574         if (mmc_host_uhs(host))
 575                 ocr |= R4_18V_PRESENT;
 576
 577 try_again:
 578         if (!retries) {
 579                 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
 580                 ocr &= ~R4_18V_PRESENT;
 581         }
 582
 583         /*
 584          * Inform the card of the voltage
 585          */
 586         if (!powered_resume) {
 587                 err = mmc_send_io_op_cond(host, ocr, &rocr);
 588                 if (err)
 589                         goto err;
 590         }
 591
 592         /*
 593          * For SPI, enable CRC as appropriate.
 594          */
 595         if (mmc_host_is_spi(host)) {
 596                 err = mmc_spi_set_crc(host, use_spi_crc);
 597                 if (err)
 598                         goto err;
 599         }
 600
 601         /*
 602          * Allocate card structure.
 603          */
 604         card = mmc_alloc_card(host, NULL);
 605         if (IS_ERR(card)) {
 606                 err = PTR_ERR(card);
 607                 goto err;
 608         }
 609
 610         if ((rocr & R4_MEMORY_PRESENT) &&
 611             mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
 612                 card->type = MMC_TYPE_SD_COMBO;
 613
 614                 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
 615                     memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
 616                         mmc_remove_card(card);
 617                         return -ENOENT;
 618                 }
 619         } else {
 620                 card->type = MMC_TYPE_SDIO;
 621
 622                 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
 623                         mmc_remove_card(card);
 624                         return -ENOENT;
 625                 }
 626         }
 627
 628         /*
 629          * Call the optional HC's init_card function to handle quirks.
 630          */
 631         if (host->ops->init_card)
 632                 host->ops->init_card(host, card);
 633
 634         /*
 635          * If the host and card support UHS-I mode request the card
 636          * to switch to 1.8V signaling level.  No 1.8v signalling if
 637          * UHS mode is not enabled to maintain compatibility and some
 638          * systems that claim 1.8v signalling in fact do not support
 639          * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
 640          * 1.8v, the card sets S18A to 0 in the R4 response. So it will
 641          * fails to check rocr & R4_18V_PRESENT,  but we still need to
 642          * try to init uhs card. sdio_read_cccr will take over this task
 643          * to make sure which speed mode should work.
 644          */
 645         if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
 646                 err = mmc_set_uhs_voltage(host, ocr_card);
 647                 if (err == -EAGAIN) {
 648                         mmc_sdio_resend_if_cond(host, card);
 649                         retries--;
 650                         goto try_again;
 651                 } else if (err) {
 652                         ocr &= ~R4_18V_PRESENT;
 653                 }
 654         }
 655
 656         /*
 657          * For native busses:  set card RCA and quit open drain mode.
 658          */
 659         if (!powered_resume && !mmc_host_is_spi(host)) {
 660                 err = mmc_send_relative_addr(host, &card->rca);
 661                 if (err)
 662                         goto remove;
 663
 664                 /*
 665                  * Update oldcard with the new RCA received from the SDIO
 666                  * device -- we're doing this so that it's updated in the
 667                  * "card" struct when oldcard overwrites that later.
 668                  */
 669                 if (oldcard)
 670                         oldcard->rca = card->rca;
 671         }
 672
 673         /*
 674          * Read CSD, before selecting the card
 675          */
 676         if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
 677                 err = mmc_sd_get_csd(host, card);
 678                 if (err)
 679                         return err;
 680
 681                 mmc_decode_cid(card);
 682         }
 683
 684         /*
 685          * Select card, as all following commands rely on that.
 686          */
 687         if (!powered_resume && !mmc_host_is_spi(host)) {
 688                 err = mmc_select_card(card);
 689                 if (err)
 690                         goto remove;
 691         }
 692
 693         if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
 694                 /*
 695                  * This is non-standard SDIO device, meaning it doesn't
 696                  * have any CIA (Common I/O area) registers present.
 697                  * It's host's responsibility to fill cccr and cis
 698                  * structures in init_card().
 699                  */
 700                 mmc_set_clock(host, card->cis.max_dtr);
 701
 702                 if (card->cccr.high_speed) {
 703                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 704                 }
 705
 706                 goto finish;
 707         }
 708
 709         /*
 710          * Read the common registers. Note that we should try to
 711          * validate whether UHS would work or not.
 712          */
 713         err = sdio_read_cccr(card, ocr);
 714         if (err) {
 715                 mmc_sdio_resend_if_cond(host, card);
 716                 if (ocr & R4_18V_PRESENT) {
 717                         /* Retry init sequence, but without R4_18V_PRESENT. */
 718                         retries = 0;
 719                         goto try_again;
 720                 } else {
 721                         goto remove;
 722                 }
 723         }
 724
 725         /*
 726          * Read the common CIS tuples.
 727          */
 728         err = sdio_read_common_cis(card);
 729         if (err)
 730                 goto remove;
 731
 732         if (oldcard) {
 733                 int same = (card->cis.vendor == oldcard->cis.vendor &&
 734                             card->cis.device == oldcard->cis.device);
 735                 mmc_remove_card(card);
 736                 if (!same)
 737                         return -ENOENT;
 738
 739                 card = oldcard;
 740         }
 741         card->ocr = ocr_card;
 742         mmc_fixup_device(card, sdio_fixup_methods);
 743
 744         if (card->type == MMC_TYPE_SD_COMBO) {
 745                 err = mmc_sd_setup_card(host, card, oldcard != NULL);
 746                 /* handle as SDIO-only card if memory init failed */
 747                 if (err) {
 748                         mmc_go_idle(host);
 749                         if (mmc_host_is_spi(host))
 750                                 /* should not fail, as it worked previously */
 751                                 mmc_spi_set_crc(host, use_spi_crc);
 752                         card->type = MMC_TYPE_SDIO;
 753                 } else
 754                         card->dev.type = &sd_type;
 755         }
 756
 757         /*
 758          * If needed, disconnect card detection pull-up resistor.
 759          */
 760         err = sdio_disable_cd(card);
 761         if (err)
 762                 goto remove;
 763
 764         /* Initialization sequence for UHS-I cards */
 765         /* Only if card supports 1.8v and UHS signaling */
 766         if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
 767                 err = mmc_sdio_init_uhs_card(card);
 768                 if (err)
 769                         goto remove;
 770         } else {
 771                 /*
 772                  * Switch to high-speed (if supported).
 773                  */
 774                 err = sdio_enable_hs(card);
 775                 if (err > 0)
 776                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 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)
 790                         goto remove;
 791         }
 792 finish:
 793         if (!oldcard)
 794                 host->card = card;
 795         return 0;
 796
 797 remove:
 798         if (!oldcard)
 799                 mmc_remove_card(card);
 800
 801 err:
 802         return err;
 803 }
 804
 805 /*
 806  * Host is being removed. Free up the current card.
 807  */
 808 static void mmc_sdio_remove(struct mmc_host *host)
 809 {
 810         int i;
 811
 812         for (i = 0;i < host->card->sdio_funcs;i++) {
 813                 if (host->card->sdio_func[i]) {
 814                         sdio_remove_func(host->card->sdio_func[i]);
 815                         host->card->sdio_func[i] = NULL;
 816                 }
 817         }
 818
 819         mmc_remove_card(host->card);
 820         host->card = NULL;
 821 }
 822
 823 /*
 824  * Card detection - card is alive.
 825  */
 826 static int mmc_sdio_alive(struct mmc_host *host)
 827 {
 828         return mmc_select_card(host->card);
 829 }
 830
 831 /*
 832  * Card detection callback from host.
 833  */
 834 static void mmc_sdio_detect(struct mmc_host *host)
 835 {
 836         int err;
 837
 838         /* Make sure card is powered before detecting it */
 839         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 840                 err = pm_runtime_get_sync(&host->card->dev);
 841                 if (err < 0) {
 842                         pm_runtime_put_noidle(&host->card->dev);
 843                         goto out;
 844                 }
 845         }
 846
 847         mmc_claim_host(host);
 848
 849         /*
 850          * Just check if our card has been removed.
 851          */
 852         err = _mmc_detect_card_removed(host);
 853
 854         mmc_release_host(host);
 855
 856         /*
 857          * Tell PM core it's OK to power off the card now.
 858          *
 859          * The _sync variant is used in order to ensure that the card
 860          * is left powered off in case an error occurred, and the card
 861          * is going to be removed.
 862          *
 863          * Since there is no specific reason to believe a new user
 864          * is about to show up at this point, the _sync variant is
 865          * desirable anyway.
 866          */
 867         if (host->caps & MMC_CAP_POWER_OFF_CARD)
 868                 pm_runtime_put_sync(&host->card->dev);
 869
 870 out:
 871         if (err) {
 872                 mmc_sdio_remove(host);
 873
 874                 mmc_claim_host(host);
 875                 mmc_detach_bus(host);
 876                 mmc_power_off(host);
 877                 mmc_release_host(host);
 878         }
 879 }
 880
 881 /*
 882  * SDIO pre_suspend.  We need to suspend all functions separately.
 883  * Therefore all registered functions must have drivers with suspend
 884  * and resume methods.  Failing that we simply remove the whole card.
 885  */
 886 static int mmc_sdio_pre_suspend(struct mmc_host *host)
 887 {
 888         int i, err = 0;
 889
 890         for (i = 0; i < host->card->sdio_funcs; i++) {
 891                 struct sdio_func *func = host->card->sdio_func[i];
 892                 if (func && sdio_func_present(func) && func->dev.driver) {
 893                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 894                         if (!pmops || !pmops->suspend || !pmops->resume) {
 895                                 /* force removal of entire card in that case */
 896                                 err = -ENOSYS;
 897                                 break;
 898                         }
 899                 }
 900         }
 901
 902         return err;
 903 }
 904
 905 /*
 906  * SDIO suspend.  Suspend all functions separately.
 907  */
 908 static int mmc_sdio_suspend(struct mmc_host *host)
 909 {
 910         mmc_claim_host(host);
 911
 912         if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
 913                 sdio_disable_wide(host->card);
 914
 915         if (!mmc_card_keep_power(host)) {
 916                 mmc_power_off(host);
 917         } else if (host->retune_period) {
 918                 mmc_retune_timer_stop(host);
 919                 mmc_retune_needed(host);
 920         }
 921
 922         mmc_release_host(host);
 923
 924         return 0;
 925 }
 926
 927 static int mmc_sdio_resume(struct mmc_host *host)
 928 {
 929         int err = 0;
 930
 931         /* Basic card reinitialization. */
 932         mmc_claim_host(host);
 933
 934         /* Restore power if needed */
 935         if (!mmc_card_keep_power(host)) {
 936                 mmc_power_up(host, host->card->ocr);
 937                 /*
 938                  * Tell runtime PM core we just powered up the card,
 939                  * since it still believes the card is powered off.
 940                  * Note that currently runtime PM is only enabled
 941                  * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
 942                  */
 943                 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 944                         pm_runtime_disable(&host->card->dev);
 945                         pm_runtime_set_active(&host->card->dev);
 946                         pm_runtime_enable(&host->card->dev);
 947                 }
 948         }
 949
 950         /* No need to reinitialize powered-resumed nonremovable cards */
 951         if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
 952                 sdio_reset(host);
 953                 mmc_go_idle(host);
 954                 mmc_send_if_cond(host, host->card->ocr);
 955                 err = mmc_send_io_op_cond(host, 0, NULL);
 956                 if (!err)
 957                         err = mmc_sdio_init_card(host, host->card->ocr,
 958                                                  host->card,
 959                                                  mmc_card_keep_power(host));
 960         } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 961                 /* We may have switched to 1-bit mode during suspend */
 962                 err = sdio_enable_4bit_bus(host->card);
 963         }
 964
 965         if (!err && host->sdio_irqs) {
 966                 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
 967                         wake_up_process(host->sdio_irq_thread);
 968                 else if (host->caps & MMC_CAP_SDIO_IRQ)
 969                         host->ops->enable_sdio_irq(host, 1);
 970         }
 971
 972         mmc_release_host(host);
 973
 974         host->pm_flags &= ~MMC_PM_KEEP_POWER;
 975         return err;
 976 }
 977
 978 static int mmc_sdio_power_restore(struct mmc_host *host)
 979 {
 980         int ret;
 981
 982         mmc_claim_host(host);
 983
 984         /*
 985          * Reset the card by performing the same steps that are taken by
 986          * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
 987          *
 988          * sdio_reset() is technically not needed. Having just powered up the
 989          * hardware, it should already be in reset state. However, some
 990          * platforms (such as SD8686 on OLPC) do not instantly cut power,
 991          * meaning that a reset is required when restoring power soon after
 992          * powering off. It is harmless in other cases.
 993          *
 994          * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
 995          * is not necessary for non-removable cards. However, it is required
 996          * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
 997          * harmless in other situations.
 998          *
 999          */
1000
1001         sdio_reset(host);
1002         mmc_go_idle(host);
1003         mmc_send_if_cond(host, host->card->ocr);
1004
1005         ret = mmc_send_io_op_cond(host, 0, NULL);
1006         if (ret)
1007                 goto out;
1008
1009         ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1010                                 mmc_card_keep_power(host));
1011         if (!ret && host->sdio_irqs)
1012                 mmc_signal_sdio_irq(host);
1013
1014 out:
1015         mmc_release_host(host);
1016
1017         return ret;
1018 }
1019
1020 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1021 {
1022         /* No references to the card, cut the power to it. */
1023         mmc_claim_host(host);
1024         mmc_power_off(host);
1025         mmc_release_host(host);
1026
1027         return 0;
1028 }
1029
1030 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1031 {
1032         int ret;
1033
1034         /* Restore power and re-initialize. */
1035         mmc_claim_host(host);
1036         mmc_power_up(host, host->card->ocr);
1037         ret = mmc_sdio_power_restore(host);
1038         mmc_release_host(host);
1039
1040         return ret;
1041 }
1042
1043 static int mmc_sdio_reset(struct mmc_host *host)
1044 {
1045         mmc_power_cycle(host, host->card->ocr);
1046         return mmc_sdio_power_restore(host);
1047 }
1048
1049 static const struct mmc_bus_ops mmc_sdio_ops = {
1050         .remove = mmc_sdio_remove,
1051         .detect = mmc_sdio_detect,
1052         .pre_suspend = mmc_sdio_pre_suspend,
1053         .suspend = mmc_sdio_suspend,
1054         .resume = mmc_sdio_resume,
1055         .runtime_suspend = mmc_sdio_runtime_suspend,
1056         .runtime_resume = mmc_sdio_runtime_resume,
1057         .power_restore = mmc_sdio_power_restore,
1058         .alive = mmc_sdio_alive,
1059         .reset = mmc_sdio_reset,
1060 };
1061
1062
1063 /*
1064  * Starting point for SDIO card init.
1065  */
1066 int mmc_attach_sdio(struct mmc_host *host)
1067 {
1068         int err, i, funcs;
1069         u32 ocr, rocr;
1070         struct mmc_card *card;
1071
1072         WARN_ON(!host->claimed);
1073
1074         err = mmc_send_io_op_cond(host, 0, &ocr);
1075         if (err)
1076                 return err;
1077
1078         mmc_attach_bus(host, &mmc_sdio_ops);
1079         if (host->ocr_avail_sdio)
1080                 host->ocr_avail = host->ocr_avail_sdio;
1081
1082
1083         rocr = mmc_select_voltage(host, ocr);
1084
1085         /*
1086          * Can we support the voltage(s) of the card(s)?
1087          */
1088         if (!rocr) {
1089                 err = -EINVAL;
1090                 goto err;
1091         }
1092
1093         /*
1094          * Detect and init the card.
1095          */
1096         err = mmc_sdio_init_card(host, rocr, NULL, 0);
1097         if (err)
1098                 goto err;
1099
1100         card = host->card;
1101
1102         /*
1103          * Enable runtime PM only if supported by host+card+board
1104          */
1105         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1106                 /*
1107                  * Let runtime PM core know our card is active
1108                  */
1109                 err = pm_runtime_set_active(&card->dev);
1110                 if (err)
1111                         goto remove;
1112
1113                 /*
1114                  * Enable runtime PM for this card
1115                  */
1116                 pm_runtime_enable(&card->dev);
1117         }
1118
1119         /*
1120          * The number of functions on the card is encoded inside
1121          * the ocr.
1122          */
1123         funcs = (ocr & 0x70000000) >> 28;
1124         card->sdio_funcs = 0;
1125
1126         /*
1127          * Initialize (but don't add) all present functions.
1128          */
1129         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1130                 err = sdio_init_func(host->card, i + 1);
1131                 if (err)
1132                         goto remove;
1133
1134                 /*
1135                  * Enable Runtime PM for this func (if supported)
1136                  */
1137                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1138                         pm_runtime_enable(&card->sdio_func[i]->dev);
1139         }
1140
1141         /*
1142          * First add the card to the driver model...
1143          */
1144         mmc_release_host(host);
1145         err = mmc_add_card(host->card);
1146         if (err)
1147                 goto remove_added;
1148
1149         /*
1150          * ...then the SDIO functions.
1151          */
1152         for (i = 0;i < funcs;i++) {
1153                 err = sdio_add_func(host->card->sdio_func[i]);
1154                 if (err)
1155                         goto remove_added;
1156         }
1157
1158         mmc_claim_host(host);
1159         return 0;
1160
1161
1162 remove_added:
1163         /* Remove without lock if the device has been added. */
1164         mmc_sdio_remove(host);
1165         mmc_claim_host(host);
1166 remove:
1167         /* And with lock if it hasn't been added. */
1168         mmc_release_host(host);
1169         if (host->card)
1170                 mmc_sdio_remove(host);
1171         mmc_claim_host(host);
1172 err:
1173         mmc_detach_bus(host);
1174
1175         pr_err("%s: error %d whilst initialising SDIO card\n",
1176                 mmc_hostname(host), err);
1177
1178         return err;
1179 }
1180