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 (card->host->caps &
 161                                 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
 162                                  MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
 163                                  MMC_CAP_UHS_DDR50)) {
 164                                 if (data & SDIO_UHS_DDR50)
 165                                         card->sw_caps.sd3_bus_mode
 166                                                 |= SD_MODE_UHS_DDR50;
 167
 168                                 if (data & SDIO_UHS_SDR50)
 169                                         card->sw_caps.sd3_bus_mode
 170                                                 |= SD_MODE_UHS_SDR50;
 171
 172                                 if (data & SDIO_UHS_SDR104)
 173                                         card->sw_caps.sd3_bus_mode
 174                                                 |= SD_MODE_UHS_SDR104;
 175                         }
 176
 177                         ret = mmc_io_rw_direct(card, 0, 0,
 178                                 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
 179                         if (ret)
 180                                 goto out;
 181
 182                         if (data & SDIO_DRIVE_SDTA)
 183                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
 184                         if (data & SDIO_DRIVE_SDTC)
 185                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
 186                         if (data & SDIO_DRIVE_SDTD)
 187                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
 188                 }
 189
 190                 /* if no uhs mode ensure we check for high speed */
 191                 if (!card->sw_caps.sd3_bus_mode) {
 192                         if (speed & SDIO_SPEED_SHS) {
 193                                 card->cccr.high_speed = 1;
 194                                 card->sw_caps.hs_max_dtr = 50000000;
 195                         } else {
 196                                 card->cccr.high_speed = 0;
 197                                 card->sw_caps.hs_max_dtr = 25000000;
 198                         }
 199                 }
 200         }
 201
 202 out:
 203         return ret;
 204 }
 205
 206 static int sdio_enable_wide(struct mmc_card *card)
 207 {
 208         int ret;
 209         u8 ctrl;
 210
 211         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 212                 return 0;
 213
 214         if (card->cccr.low_speed && !card->cccr.wide_bus)
 215                 return 0;
 216
 217         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 218         if (ret)
 219                 return ret;
 220
 221         ctrl |= SDIO_BUS_WIDTH_4BIT;
 222
 223         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 224         if (ret)
 225                 return ret;
 226
 227         return 1;
 228 }
 229
 230 /*
 231  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
 232  * of the card. This may be required on certain setups of boards,
 233  * controllers and embedded sdio device which do not need the card's
 234  * pull-up. As a result, card detection is disabled and power is saved.
 235  */
 236 static int sdio_disable_cd(struct mmc_card *card)
 237 {
 238         int ret;
 239         u8 ctrl;
 240
 241         if (!mmc_card_disable_cd(card))
 242                 return 0;
 243
 244         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 245         if (ret)
 246                 return ret;
 247
 248         ctrl |= SDIO_BUS_CD_DISABLE;
 249
 250         return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 251 }
 252
 253 /*
 254  * Devices that remain active during a system suspend are
 255  * put back into 1-bit mode.
 256  */
 257 static int sdio_disable_wide(struct mmc_card *card)
 258 {
 259         int ret;
 260         u8 ctrl;
 261
 262         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 263                 return 0;
 264
 265         if (card->cccr.low_speed && !card->cccr.wide_bus)
 266                 return 0;
 267
 268         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 269         if (ret)
 270                 return ret;
 271
 272         if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
 273                 return 0;
 274
 275         ctrl &= ~SDIO_BUS_WIDTH_4BIT;
 276         ctrl |= SDIO_BUS_ASYNC_INT;
 277
 278         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 279         if (ret)
 280                 return ret;
 281
 282         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
 283
 284         return 0;
 285 }
 286
 287
 288 static int sdio_enable_4bit_bus(struct mmc_card *card)
 289 {
 290         int err;
 291
 292         if (card->type == MMC_TYPE_SDIO)
 293                 return sdio_enable_wide(card);
 294
 295         if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
 296                 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 297                 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 298                 if (err)
 299                         return err;
 300         } else
 301                 return 0;
 302
 303         err = sdio_enable_wide(card);
 304         if (err <= 0)
 305                 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
 306
 307         return err;
 308 }
 309
 310
 311 /*
 312  * Test if the card supports high-speed mode and, if so, switch to it.
 313  */
 314 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
 315 {
 316         int ret;
 317         u8 speed;
 318
 319         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
 320                 return 0;
 321
 322         if (!card->cccr.high_speed)
 323                 return 0;
 324
 325         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 326         if (ret)
 327                 return ret;
 328
 329         if (enable)
 330                 speed |= SDIO_SPEED_EHS;
 331         else
 332                 speed &= ~SDIO_SPEED_EHS;
 333
 334         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 335         if (ret)
 336                 return ret;
 337
 338         return 1;
 339 }
 340
 341 /*
 342  * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
 343  */
 344 static int sdio_enable_hs(struct mmc_card *card)
 345 {
 346         int ret;
 347
 348         ret = mmc_sdio_switch_hs(card, true);
 349         if (ret <= 0 || card->type == MMC_TYPE_SDIO)
 350                 return ret;
 351
 352         ret = mmc_sd_switch_hs(card);
 353         if (ret <= 0)
 354                 mmc_sdio_switch_hs(card, false);
 355
 356         return ret;
 357 }
 358
 359 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
 360 {
 361         unsigned max_dtr;
 362
 363         if (mmc_card_highspeed(card)) {
 364                 /*
 365                  * The SDIO specification doesn't mention how
 366                  * the CIS transfer speed register relates to
 367                  * high-speed, but it seems that 50 MHz is
 368                  * mandatory.
 369                  */
 370                 max_dtr = 50000000;
 371         } else {
 372                 max_dtr = card->cis.max_dtr;
 373         }
 374
 375         if (card->type == MMC_TYPE_SD_COMBO)
 376                 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
 377
 378         return max_dtr;
 379 }
 380
 381 static unsigned char host_drive_to_sdio_drive(int host_strength)
 382 {
 383         switch (host_strength) {
 384         case MMC_SET_DRIVER_TYPE_A:
 385                 return SDIO_DTSx_SET_TYPE_A;
 386         case MMC_SET_DRIVER_TYPE_B:
 387                 return SDIO_DTSx_SET_TYPE_B;
 388         case MMC_SET_DRIVER_TYPE_C:
 389                 return SDIO_DTSx_SET_TYPE_C;
 390         case MMC_SET_DRIVER_TYPE_D:
 391                 return SDIO_DTSx_SET_TYPE_D;
 392         default:
 393                 return SDIO_DTSx_SET_TYPE_B;
 394         }
 395 }
 396
 397 static void sdio_select_driver_type(struct mmc_card *card)
 398 {
 399         int host_drv_type = SD_DRIVER_TYPE_B;
 400         int card_drv_type = SD_DRIVER_TYPE_B;
 401         int drive_strength;
 402         unsigned char card_strength;
 403         int err;
 404
 405         /*
 406          * If the host doesn't support any of the Driver Types A,C or D,
 407          * or there is no board specific handler then default Driver
 408          * Type B is used.
 409          */
 410         if (!(card->host->caps &
 411                 (MMC_CAP_DRIVER_TYPE_A |
 412                  MMC_CAP_DRIVER_TYPE_C |
 413                  MMC_CAP_DRIVER_TYPE_D)))
 414                 return;
 415
 416         if (!card->host->ops->select_drive_strength)
 417                 return;
 418
 419         if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
 420                 host_drv_type |= SD_DRIVER_TYPE_A;
 421
 422         if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
 423                 host_drv_type |= SD_DRIVER_TYPE_C;
 424
 425         if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
 426                 host_drv_type |= SD_DRIVER_TYPE_D;
 427
 428         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
 429                 card_drv_type |= SD_DRIVER_TYPE_A;
 430
 431         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
 432                 card_drv_type |= SD_DRIVER_TYPE_C;
 433
 434         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
 435                 card_drv_type |= SD_DRIVER_TYPE_D;
 436
 437         /*
 438          * The drive strength that the hardware can support
 439          * depends on the board design.  Pass the appropriate
 440          * information and let the hardware specific code
 441          * return what is possible given the options
 442          */
 443         drive_strength = card->host->ops->select_drive_strength(
 444                 card->sw_caps.uhs_max_dtr,
 445                 host_drv_type, card_drv_type);
 446
 447         /* if error just use default for drive strength B */
 448         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
 449                 &card_strength);
 450         if (err)
 451                 return;
 452
 453         card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
 454         card_strength |= host_drive_to_sdio_drive(drive_strength);
 455
 456         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
 457                 card_strength, NULL);
 458
 459         /* if error default to drive strength B */
 460         if (!err)
 461                 mmc_set_driver_type(card->host, drive_strength);
 462 }
 463
 464
 465 static int sdio_set_bus_speed_mode(struct mmc_card *card)
 466 {
 467         unsigned int bus_speed, timing;
 468         int err;
 469         unsigned char speed;
 470
 471         /*
 472          * If the host doesn't support any of the UHS-I modes, fallback on
 473          * default speed.
 474          */
 475         if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
 476             MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
 477                 return 0;
 478
 479         bus_speed = SDIO_SPEED_SDR12;
 480         timing = MMC_TIMING_UHS_SDR12;
 481         if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
 482             (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
 483                         bus_speed = SDIO_SPEED_SDR104;
 484                         timing = MMC_TIMING_UHS_SDR104;
 485                         card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
 486         } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
 487                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
 488                         bus_speed = SDIO_SPEED_DDR50;
 489                         timing = MMC_TIMING_UHS_DDR50;
 490                         card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
 491         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 492                     MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
 493                     SD_MODE_UHS_SDR50)) {
 494                         bus_speed = SDIO_SPEED_SDR50;
 495                         timing = MMC_TIMING_UHS_SDR50;
 496                         card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
 497         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 498                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
 499                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
 500                         bus_speed = SDIO_SPEED_SDR25;
 501                         timing = MMC_TIMING_UHS_SDR25;
 502                         card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
 503         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 504                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
 505                     MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
 506                     SD_MODE_UHS_SDR12)) {
 507                         bus_speed = SDIO_SPEED_SDR12;
 508                         timing = MMC_TIMING_UHS_SDR12;
 509                         card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
 510         }
 511
 512         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 513         if (err)
 514                 return err;
 515
 516         speed &= ~SDIO_SPEED_BSS_MASK;
 517         speed |= bus_speed;
 518         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 519         if (err)
 520                 return err;
 521
 522         if (bus_speed) {
 523                 mmc_set_timing(card->host, timing);
 524                 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
 525         }
 526
 527         return 0;
 528 }
 529
 530 /*
 531  * UHS-I specific initialization procedure
 532  */
 533 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
 534 {
 535         int err;
 536
 537         if (!card->scr.sda_spec3)
 538                 return 0;
 539
 540         /*
 541          * Switch to wider bus (if supported).
 542          */
 543         if (card->host->caps & MMC_CAP_4_BIT_DATA) {
 544                 err = sdio_enable_4bit_bus(card);
 545                 if (err > 0) {
 546                         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 547                         err = 0;
 548                 }
 549         }
 550
 551         /* Set the driver strength for the card */
 552         sdio_select_driver_type(card);
 553
 554         /* Set bus speed mode of the card */
 555         err = sdio_set_bus_speed_mode(card);
 556         if (err)
 557                 goto out;
 558
 559         /* Initialize and start re-tuning timer */
 560         if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
 561                 err = card->host->ops->execute_tuning(card->host,
 562                                                       MMC_SEND_TUNING_BLOCK);
 563
 564 out:
 565
 566         return err;
 567 }
 568
 569 /*
 570  * Handle the detection and initialisation of a card.
 571  *
 572  * In the case of a resume, "oldcard" will contain the card
 573  * we're trying to reinitialise.
 574  */
 575 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 576                               struct mmc_card *oldcard, int powered_resume)
 577 {
 578         struct mmc_card *card;
 579         int err;
 580
 581         BUG_ON(!host);
 582         WARN_ON(!host->claimed);
 583
 584         /*
 585          * Inform the card of the voltage
 586          */
 587         if (!powered_resume) {
 588                 /* The initialization should be done at 3.3 V I/O voltage. */
 589                 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
 590
 591                 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
 592                 if (err)
 593                         goto err;
 594         }
 595
 596         /*
 597          * For SPI, enable CRC as appropriate.
 598          */
 599         if (mmc_host_is_spi(host)) {
 600                 err = mmc_spi_set_crc(host, use_spi_crc);
 601                 if (err)
 602                         goto err;
 603         }
 604
 605         /*
 606          * Allocate card structure.
 607          */
 608         card = mmc_alloc_card(host, NULL);
 609         if (IS_ERR(card)) {
 610                 err = PTR_ERR(card);
 611                 goto err;
 612         }
 613
 614         if ((ocr & R4_MEMORY_PRESENT) &&
 615             mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
 616                 card->type = MMC_TYPE_SD_COMBO;
 617
 618                 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
 619                     memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
 620                         mmc_remove_card(card);
 621                         return -ENOENT;
 622                 }
 623         } else {
 624                 card->type = MMC_TYPE_SDIO;
 625
 626                 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
 627                         mmc_remove_card(card);
 628                         return -ENOENT;
 629                 }
 630         }
 631
 632         /*
 633          * Call the optional HC's init_card function to handle quirks.
 634          */
 635         if (host->ops->init_card)
 636                 host->ops->init_card(host, card);
 637
 638         /*
 639          * If the host and card support UHS-I mode request the card
 640          * to switch to 1.8V signaling level.  No 1.8v signalling if
 641          * UHS mode is not enabled to maintain compatibilty and some
 642          * systems that claim 1.8v signalling in fact do not support
 643          * it.
 644          */
 645         if ((ocr & R4_18V_PRESENT) &&
 646                 (host->caps &
 647                         (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
 648                          MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
 649                          MMC_CAP_UHS_DDR50))) {
 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                 err = mmc_sdio_init_card(host, host->ocr, host->card,
 939                                         mmc_card_keep_power(host));
 940         else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 941                 /* We may have switched to 1-bit mode during suspend */
 942                 err = sdio_enable_4bit_bus(host->card);
 943                 if (err > 0) {
 944                         mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
 945                         err = 0;
 946                 }
 947         }
 948
 949         if (!err && host->sdio_irqs)
 950                 wake_up_process(host->sdio_irq_thread);
 951         mmc_release_host(host);
 952
 953         /*
 954          * If the card looked to be the same as before suspending, then
 955          * we proceed to resume all card functions.  If one of them returns
 956          * an error then we simply return that error to the core and the
 957          * card will be redetected as new.  It is the responsibility of
 958          * the function driver to perform further tests with the extra
 959          * knowledge it has of the card to confirm the card is indeed the
 960          * same as before suspending (same MAC address for network cards,
 961          * etc.) and return an error otherwise.
 962          */
 963         for (i = 0; !err && i < host->card->sdio_funcs; i++) {
 964                 struct sdio_func *func = host->card->sdio_func[i];
 965                 if (func && sdio_func_present(func) && func->dev.driver) {
 966                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 967                         err = pmops->resume(&func->dev);
 968                 }
 969         }
 970
 971         return err;
 972 }
 973
 974 static int mmc_sdio_power_restore(struct mmc_host *host)
 975 {
 976         int ret;
 977         u32 ocr;
 978
 979         BUG_ON(!host);
 980         BUG_ON(!host->card);
 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          * With these steps taken, mmc_select_voltage() is also required to
1000          * restore the correct voltage setting of the card.
1001          */
1002
1003         /* The initialization should be done at 3.3 V I/O voltage. */
1004         if (!mmc_card_keep_power(host))
1005                 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
1006
1007         sdio_reset(host);
1008         mmc_go_idle(host);
1009         mmc_send_if_cond(host, host->ocr_avail);
1010
1011         ret = mmc_send_io_op_cond(host, 0, &ocr);
1012         if (ret)
1013                 goto out;
1014
1015         if (host->ocr_avail_sdio)
1016                 host->ocr_avail = host->ocr_avail_sdio;
1017
1018         host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1019         if (!host->ocr) {
1020                 ret = -EINVAL;
1021                 goto out;
1022         }
1023
1024         ret = mmc_sdio_init_card(host, host->ocr, host->card,
1025                                 mmc_card_keep_power(host));
1026         if (!ret && host->sdio_irqs)
1027                 mmc_signal_sdio_irq(host);
1028
1029 out:
1030         mmc_release_host(host);
1031
1032         return ret;
1033 }
1034
1035 static const struct mmc_bus_ops mmc_sdio_ops = {
1036         .remove = mmc_sdio_remove,
1037         .detect = mmc_sdio_detect,
1038         .suspend = mmc_sdio_suspend,
1039         .resume = mmc_sdio_resume,
1040         .power_restore = mmc_sdio_power_restore,
1041         .alive = mmc_sdio_alive,
1042 };
1043
1044
1045 /*
1046  * Starting point for SDIO card init.
1047  */
1048 int mmc_attach_sdio(struct mmc_host *host)
1049 {
1050         int err, i, funcs;
1051         u32 ocr;
1052         struct mmc_card *card;
1053
1054         BUG_ON(!host);
1055         WARN_ON(!host->claimed);
1056
1057         err = mmc_send_io_op_cond(host, 0, &ocr);
1058         if (err)
1059                 return err;
1060
1061         mmc_attach_bus(host, &mmc_sdio_ops);
1062         if (host->ocr_avail_sdio)
1063                 host->ocr_avail = host->ocr_avail_sdio;
1064
1065         /*
1066          * Sanity check the voltages that the card claims to
1067          * support.
1068          */
1069         if (ocr & 0x7F) {
1070                 pr_warning("%s: card claims to support voltages "
1071                        "below the defined range. These will be ignored.\n",
1072                        mmc_hostname(host));
1073                 ocr &= ~0x7F;
1074         }
1075
1076         host->ocr = mmc_select_voltage(host, ocr);
1077
1078         /*
1079          * Can we support the voltage(s) of the card(s)?
1080          */
1081         if (!host->ocr) {
1082                 err = -EINVAL;
1083                 goto err;
1084         }
1085
1086         /*
1087          * Detect and init the card.
1088          */
1089         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1090         if (err) {
1091                 if (err == -EAGAIN) {
1092                         /*
1093                          * Retry initialization with S18R set to 0.
1094                          */
1095                         host->ocr &= ~R4_18V_PRESENT;
1096                         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1097                 }
1098                 if (err)
1099                         goto err;
1100         }
1101         card = host->card;
1102
1103         /*
1104          * Enable runtime PM only if supported by host+card+board
1105          */
1106         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1107                 /*
1108                  * Let runtime PM core know our card is active
1109                  */
1110                 err = pm_runtime_set_active(&card->dev);
1111                 if (err)
1112                         goto remove;
1113
1114                 /*
1115                  * Enable runtime PM for this card
1116                  */
1117                 pm_runtime_enable(&card->dev);
1118         }
1119
1120         /*
1121          * The number of functions on the card is encoded inside
1122          * the ocr.
1123          */
1124         funcs = (ocr & 0x70000000) >> 28;
1125         card->sdio_funcs = 0;
1126
1127         /*
1128          * Initialize (but don't add) all present functions.
1129          */
1130         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1131                 err = sdio_init_func(host->card, i + 1);
1132                 if (err)
1133                         goto remove;
1134
1135                 /*
1136                  * Enable Runtime PM for this func (if supported)
1137                  */
1138                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1139                         pm_runtime_enable(&card->sdio_func[i]->dev);
1140         }
1141
1142         /*
1143          * First add the card to the driver model...
1144          */
1145         mmc_release_host(host);
1146         err = mmc_add_card(host->card);
1147         if (err)
1148                 goto remove_added;
1149
1150         /*
1151          * ...then the SDIO functions.
1152          */
1153         for (i = 0;i < funcs;i++) {
1154                 err = sdio_add_func(host->card->sdio_func[i]);
1155                 if (err)
1156                         goto remove_added;
1157         }
1158
1159         mmc_claim_host(host);
1160         return 0;
1161
1162
1163 remove_added:
1164         /* Remove without lock if the device has been added. */
1165         mmc_sdio_remove(host);
1166         mmc_claim_host(host);
1167 remove:
1168         /* And with lock if it hasn't been added. */
1169         mmc_release_host(host);
1170         if (host->card)
1171                 mmc_sdio_remove(host);
1172         mmc_claim_host(host);
1173 err:
1174         mmc_detach_bus(host);
1175
1176         pr_err("%s: error %d whilst initialising SDIO card\n",
1177                 mmc_hostname(host), err);
1178
1179         return err;
1180 }
1181