drivers/mmc/core/sd.c

   1 /*
   2  *  linux/drivers/mmc/core/sd.c
   3  *
   4  *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
   5  *  SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
   6  *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/slab.h>
  15
  16 #include <linux/mmc/host.h>
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/mmc.h>
  19 #include <linux/mmc/sd.h>
  20
  21 #include "core.h"
  22 #include "bus.h"
  23 #include "mmc_ops.h"
  24 #include "sd.h"
  25 #include "sd_ops.h"
  26
  27 static const unsigned int tran_exp[] = {
  28         10000,          100000,         1000000,        10000000,
  29         0,              0,              0,              0
  30 };
  31
  32 static const unsigned char tran_mant[] = {
  33         0,      10,     12,     13,     15,     20,     25,     30,
  34         35,     40,     45,     50,     55,     60,     70,     80,
  35 };
  36
  37 static const unsigned int tacc_exp[] = {
  38         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  39 };
  40
  41 static const unsigned int tacc_mant[] = {
  42         0,      10,     12,     13,     15,     20,     25,     30,
  43         35,     40,     45,     50,     55,     60,     70,     80,
  44 };
  45
  46 #define UNSTUFF_BITS(resp,start,size)                                   \
  47         ({                                                              \
  48                 const int __size = size;                                \
  49                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  50                 const int __off = 3 - ((start) / 32);                   \
  51                 const int __shft = (start) & 31;                        \
  52                 u32 __res;                                              \
  53                                                                         \
  54                 __res = resp[__off] >> __shft;                          \
  55                 if (__size + __shft > 32)                               \
  56                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  57                 __res & __mask;                                         \
  58         })
  59
  60 /*
  61  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  62  */
  63 void mmc_decode_cid(struct mmc_card *card)
  64 {
  65         u32 *resp = card->raw_cid;
  66
  67         memset(&card->cid, 0, sizeof(struct mmc_cid));
  68
  69         /*
  70          * SD doesn't currently have a version field so we will
  71          * have to assume we can parse this.
  72          */
  73         card->cid.manfid                = UNSTUFF_BITS(resp, 120, 8);
  74         card->cid.oemid                 = UNSTUFF_BITS(resp, 104, 16);
  75         card->cid.prod_name[0]          = UNSTUFF_BITS(resp, 96, 8);
  76         card->cid.prod_name[1]          = UNSTUFF_BITS(resp, 88, 8);
  77         card->cid.prod_name[2]          = UNSTUFF_BITS(resp, 80, 8);
  78         card->cid.prod_name[3]          = UNSTUFF_BITS(resp, 72, 8);
  79         card->cid.prod_name[4]          = UNSTUFF_BITS(resp, 64, 8);
  80         card->cid.hwrev                 = UNSTUFF_BITS(resp, 60, 4);
  81         card->cid.fwrev                 = UNSTUFF_BITS(resp, 56, 4);
  82         card->cid.serial                = UNSTUFF_BITS(resp, 24, 32);
  83         card->cid.year                  = UNSTUFF_BITS(resp, 12, 8);
  84         card->cid.month                 = UNSTUFF_BITS(resp, 8, 4);
  85
  86         card->cid.year += 2000; /* SD cards year offset */
  87 }
  88
  89 /*
  90  * Given a 128-bit response, decode to our card CSD structure.
  91  */
  92 static int mmc_decode_csd(struct mmc_card *card)
  93 {
  94         struct mmc_csd *csd = &card->csd;
  95         unsigned int e, m, csd_struct;
  96         u32 *resp = card->raw_csd;
  97
  98         csd_struct = UNSTUFF_BITS(resp, 126, 2);
  99
 100         switch (csd_struct) {
 101         case 0:
 102                 m = UNSTUFF_BITS(resp, 115, 4);
 103                 e = UNSTUFF_BITS(resp, 112, 3);
 104                 csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 105                 csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 106
 107                 m = UNSTUFF_BITS(resp, 99, 4);
 108                 e = UNSTUFF_BITS(resp, 96, 3);
 109                 csd->max_dtr      = tran_exp[e] * tran_mant[m];
 110                 csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 111
 112                 e = UNSTUFF_BITS(resp, 47, 3);
 113                 m = UNSTUFF_BITS(resp, 62, 12);
 114                 csd->capacity     = (1 + m) << (e + 2);
 115
 116                 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 117                 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 118                 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 119                 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 120                 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 121                 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 122                 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 123
 124                 if (UNSTUFF_BITS(resp, 46, 1)) {
 125                         csd->erase_size = 1;
 126                 } else if (csd->write_blkbits >= 9) {
 127                         csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
 128                         csd->erase_size <<= csd->write_blkbits - 9;
 129                 }
 130                 break;
 131         case 1:
 132                 /*
 133                  * This is a block-addressed SDHC card. Most
 134                  * interesting fields are unused and have fixed
 135                  * values. To avoid getting tripped by buggy cards,
 136                  * we assume those fixed values ourselves.
 137                  */
 138                 mmc_card_set_blockaddr(card);
 139
 140                 csd->tacc_ns     = 0; /* Unused */
 141                 csd->tacc_clks   = 0; /* Unused */
 142
 143                 m = UNSTUFF_BITS(resp, 99, 4);
 144                 e = UNSTUFF_BITS(resp, 96, 3);
 145                 csd->max_dtr      = tran_exp[e] * tran_mant[m];
 146                 csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 147
 148                 m = UNSTUFF_BITS(resp, 48, 22);
 149                 csd->capacity     = (1 + m) << 10;
 150
 151                 csd->read_blkbits = 9;
 152                 csd->read_partial = 0;
 153                 csd->write_misalign = 0;
 154                 csd->read_misalign = 0;
 155                 csd->r2w_factor = 4; /* Unused */
 156                 csd->write_blkbits = 9;
 157                 csd->write_partial = 0;
 158                 csd->erase_size = 1;
 159                 break;
 160         default:
 161                 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
 162                         mmc_hostname(card->host), csd_struct);
 163                 return -EINVAL;
 164         }
 165
 166         card->erase_size = csd->erase_size;
 167
 168         return 0;
 169 }
 170
 171 /*
 172  * Given a 64-bit response, decode to our card SCR structure.
 173  */
 174 static int mmc_decode_scr(struct mmc_card *card)
 175 {
 176         struct sd_scr *scr = &card->scr;
 177         unsigned int scr_struct;
 178         u32 resp[4];
 179
 180         resp[3] = card->raw_scr[1];
 181         resp[2] = card->raw_scr[0];
 182
 183         scr_struct = UNSTUFF_BITS(resp, 60, 4);
 184         if (scr_struct != 0) {
 185                 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
 186                         mmc_hostname(card->host), scr_struct);
 187                 return -EINVAL;
 188         }
 189
 190         scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
 191         scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
 192
 193         if (UNSTUFF_BITS(resp, 55, 1))
 194                 card->erased_byte = 0xFF;
 195         else
 196                 card->erased_byte = 0x0;
 197
 198         return 0;
 199 }
 200
 201 /*
 202  * Fetch and process SD Status register.
 203  */
 204 static int mmc_read_ssr(struct mmc_card *card)
 205 {
 206         unsigned int au, es, et, eo;
 207         int err, i;
 208         u32 *ssr;
 209
 210         if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
 211                 printk(KERN_WARNING "%s: card lacks mandatory SD Status "
 212                         "function.\n", mmc_hostname(card->host));
 213                 return 0;
 214         }
 215
 216         ssr = kmalloc(64, GFP_KERNEL);
 217         if (!ssr)
 218                 return -ENOMEM;
 219
 220         err = mmc_app_sd_status(card, ssr);
 221         if (err) {
 222                 printk(KERN_WARNING "%s: problem reading SD Status "
 223                         "register.\n", mmc_hostname(card->host));
 224                 err = 0;
 225                 goto out;
 226         }
 227
 228         for (i = 0; i < 16; i++)
 229                 ssr[i] = be32_to_cpu(ssr[i]);
 230
 231         /*
 232          * UNSTUFF_BITS only works with four u32s so we have to offset the
 233          * bitfield positions accordingly.
 234          */
 235         au = UNSTUFF_BITS(ssr, 428 - 384, 4);
 236         if (au > 0 || au <= 9) {
 237                 card->ssr.au = 1 << (au + 4);
 238                 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
 239                 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
 240                 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
 241                 if (es && et) {
 242                         card->ssr.erase_timeout = (et * 1000) / es;
 243                         card->ssr.erase_offset = eo * 1000;
 244                 }
 245         } else {
 246                 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit "
 247                         "size.\n", mmc_hostname(card->host));
 248         }
 249 out:
 250         kfree(ssr);
 251         return err;
 252 }
 253
 254 /*
 255  * Fetches and decodes switch information
 256  */
 257 static int mmc_read_switch(struct mmc_card *card)
 258 {
 259         int err;
 260         u8 *status;
 261
 262         if (card->scr.sda_vsn < SCR_SPEC_VER_1)
 263                 return 0;
 264
 265         if (!(card->csd.cmdclass & CCC_SWITCH)) {
 266                 printk(KERN_WARNING "%s: card lacks mandatory switch "
 267                         "function, performance might suffer.\n",
 268                         mmc_hostname(card->host));
 269                 return 0;
 270         }
 271
 272         err = -EIO;
 273
 274         status = kmalloc(64, GFP_KERNEL);
 275         if (!status) {
 276                 printk(KERN_ERR "%s: could not allocate a buffer for "
 277                         "switch capabilities.\n", mmc_hostname(card->host));
 278                 return -ENOMEM;
 279         }
 280
 281         err = mmc_sd_switch(card, 0, 0, 1, status);
 282         if (err) {
 283                 /* If the host or the card can't do the switch,
 284                  * fail more gracefully. */
 285                 if ((err != -EINVAL)
 286                  && (err != -ENOSYS)
 287                  && (err != -EFAULT))
 288                         goto out;
 289
 290                 printk(KERN_WARNING "%s: problem reading switch "
 291                         "capabilities, performance might suffer.\n",
 292                         mmc_hostname(card->host));
 293                 err = 0;
 294
 295                 goto out;
 296         }
 297
 298         if (status[13] & 0x02)
 299                 card->sw_caps.hs_max_dtr = 50000000;
 300
 301 out:
 302         kfree(status);
 303
 304         return err;
 305 }
 306
 307 /*
 308  * Test if the card supports high-speed mode and, if so, switch to it.
 309  */
 310 int mmc_sd_switch_hs(struct mmc_card *card)
 311 {
 312         int err;
 313         u8 *status;
 314
 315         if (card->scr.sda_vsn < SCR_SPEC_VER_1)
 316                 return 0;
 317
 318         if (!(card->csd.cmdclass & CCC_SWITCH))
 319                 return 0;
 320
 321         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
 322                 return 0;
 323
 324         if (card->sw_caps.hs_max_dtr == 0)
 325                 return 0;
 326
 327         err = -EIO;
 328
 329         status = kmalloc(64, GFP_KERNEL);
 330         if (!status) {
 331                 printk(KERN_ERR "%s: could not allocate a buffer for "
 332                         "switch capabilities.\n", mmc_hostname(card->host));
 333                 return -ENOMEM;
 334         }
 335
 336         err = mmc_sd_switch(card, 1, 0, 1, status);
 337         if (err)
 338                 goto out;
 339
 340         if ((status[16] & 0xF) != 1) {
 341                 printk(KERN_WARNING "%s: Problem switching card "
 342                         "into high-speed mode!\n",
 343                         mmc_hostname(card->host));
 344                 err = 0;
 345         } else {
 346                 err = 1;
 347         }
 348
 349 out:
 350         kfree(status);
 351
 352         return err;
 353 }
 354
 355 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 356         card->raw_cid[2], card->raw_cid[3]);
 357 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 358         card->raw_csd[2], card->raw_csd[3]);
 359 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
 360 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 361 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 362 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 363 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 364 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 365 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 366 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 367 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 368 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 369
 370
 371 static struct attribute *sd_std_attrs[] = {
 372         &dev_attr_cid.attr,
 373         &dev_attr_csd.attr,
 374         &dev_attr_scr.attr,
 375         &dev_attr_date.attr,
 376         &dev_attr_erase_size.attr,
 377         &dev_attr_preferred_erase_size.attr,
 378         &dev_attr_fwrev.attr,
 379         &dev_attr_hwrev.attr,
 380         &dev_attr_manfid.attr,
 381         &dev_attr_name.attr,
 382         &dev_attr_oemid.attr,
 383         &dev_attr_serial.attr,
 384         NULL,
 385 };
 386
 387 static struct attribute_group sd_std_attr_group = {
 388         .attrs = sd_std_attrs,
 389 };
 390
 391 static const struct attribute_group *sd_attr_groups[] = {
 392         &sd_std_attr_group,
 393         NULL,
 394 };
 395
 396 struct device_type sd_type = {
 397         .groups = sd_attr_groups,
 398 };
 399
 400 /*
 401  * Fetch CID from card.
 402  */
 403 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid)
 404 {
 405         int err;
 406
 407         /*
 408          * Since we're changing the OCR value, we seem to
 409          * need to tell some cards to go back to the idle
 410          * state.  We wait 1ms to give cards time to
 411          * respond.
 412          */
 413         mmc_go_idle(host);
 414
 415         /*
 416          * If SD_SEND_IF_COND indicates an SD 2.0
 417          * compliant card and we should set bit 30
 418          * of the ocr to indicate that we can handle
 419          * block-addressed SDHC cards.
 420          */
 421         err = mmc_send_if_cond(host, ocr);
 422         if (!err)
 423                 ocr |= 1 << 30;
 424
 425         err = mmc_send_app_op_cond(host, ocr, NULL);
 426         if (err)
 427                 return err;
 428
 429         if (mmc_host_is_spi(host))
 430                 err = mmc_send_cid(host, cid);
 431         else
 432                 err = mmc_all_send_cid(host, cid);
 433
 434         return err;
 435 }
 436
 437 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
 438 {
 439         int err;
 440
 441         /*
 442          * Fetch CSD from card.
 443          */
 444         err = mmc_send_csd(card, card->raw_csd);
 445         if (err)
 446                 return err;
 447
 448         err = mmc_decode_csd(card);
 449         if (err)
 450                 return err;
 451
 452         return 0;
 453 }
 454
 455 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
 456         bool reinit)
 457 {
 458         int err;
 459
 460         if (!reinit) {
 461                 /*
 462                  * Fetch SCR from card.
 463                  */
 464                 err = mmc_app_send_scr(card, card->raw_scr);
 465                 if (err)
 466                         return err;
 467
 468                 err = mmc_decode_scr(card);
 469                 if (err)
 470                         return err;
 471
 472                 /*
 473                  * Fetch and process SD Status register.
 474                  */
 475                 err = mmc_read_ssr(card);
 476                 if (err)
 477                         return err;
 478
 479                 /* Erase init depends on CSD and SSR */
 480                 mmc_init_erase(card);
 481
 482                 /*
 483                  * Fetch switch information from card.
 484                  */
 485                 err = mmc_read_switch(card);
 486                 if (err)
 487                         return err;
 488         }
 489
 490         /*
 491          * For SPI, enable CRC as appropriate.
 492          * This CRC enable is located AFTER the reading of the
 493          * card registers because some SDHC cards are not able
 494          * to provide valid CRCs for non-512-byte blocks.
 495          */
 496         if (mmc_host_is_spi(host)) {
 497                 err = mmc_spi_set_crc(host, use_spi_crc);
 498                 if (err)
 499                         return err;
 500         }
 501
 502         /*
 503          * Check if read-only switch is active.
 504          */
 505         if (!reinit) {
 506                 int ro = -1;
 507
 508                 if (host->ops->get_ro)
 509                         ro = host->ops->get_ro(host);
 510
 511                 if (ro < 0) {
 512                         printk(KERN_WARNING "%s: host does not "
 513                                 "support reading read-only "
 514                                 "switch. assuming write-enable.\n",
 515                                 mmc_hostname(host));
 516                 } else if (ro > 0) {
 517                         mmc_card_set_readonly(card);
 518                 }
 519         }
 520
 521         return 0;
 522 }
 523
 524 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
 525 {
 526         unsigned max_dtr = (unsigned int)-1;
 527
 528         if (mmc_card_highspeed(card)) {
 529                 if (max_dtr > card->sw_caps.hs_max_dtr)
 530                         max_dtr = card->sw_caps.hs_max_dtr;
 531         } else if (max_dtr > card->csd.max_dtr) {
 532                 max_dtr = card->csd.max_dtr;
 533         }
 534
 535         return max_dtr;
 536 }
 537
 538 void mmc_sd_go_highspeed(struct mmc_card *card)
 539 {
 540         mmc_card_set_highspeed(card);
 541         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 542 }
 543
 544 /*
 545  * Handle the detection and initialisation of a card.
 546  *
 547  * In the case of a resume, "oldcard" will contain the card
 548  * we're trying to reinitialise.
 549  */
 550 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 551         struct mmc_card *oldcard)
 552 {
 553         struct mmc_card *card;
 554         int err;
 555         u32 cid[4];
 556
 557         BUG_ON(!host);
 558         WARN_ON(!host->claimed);
 559
 560         err = mmc_sd_get_cid(host, ocr, cid);
 561         if (err)
 562                 return err;
 563
 564         if (oldcard) {
 565                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
 566                         return -ENOENT;
 567
 568                 card = oldcard;
 569         } else {
 570                 /*
 571                  * Allocate card structure.
 572                  */
 573                 card = mmc_alloc_card(host, &sd_type);
 574                 if (IS_ERR(card))
 575                         return PTR_ERR(card);
 576
 577                 card->type = MMC_TYPE_SD;
 578                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 579         }
 580
 581         /*
 582          * For native busses:  get card RCA and quit open drain mode.
 583          */
 584         if (!mmc_host_is_spi(host)) {
 585                 err = mmc_send_relative_addr(host, &card->rca);
 586                 if (err)
 587                         return err;
 588
 589                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 590         }
 591
 592         if (!oldcard) {
 593                 err = mmc_sd_get_csd(host, card);
 594                 if (err)
 595                         return err;
 596
 597                 mmc_decode_cid(card);
 598         }
 599
 600         /*
 601          * Select card, as all following commands rely on that.
 602          */
 603         if (!mmc_host_is_spi(host)) {
 604                 err = mmc_select_card(card);
 605                 if (err)
 606                         return err;
 607         }
 608
 609         err = mmc_sd_setup_card(host, card, oldcard != NULL);
 610         if (err)
 611                 goto free_card;
 612
 613         /*
 614          * Attempt to change to high-speed (if supported)
 615          */
 616         err = mmc_sd_switch_hs(card);
 617         if (err > 0)
 618                 mmc_sd_go_highspeed(card);
 619         else if (err)
 620                 goto free_card;
 621
 622         /*
 623          * Set bus speed.
 624          */
 625         mmc_set_clock(host, mmc_sd_get_max_clock(card));
 626
 627         /*
 628          * Switch to wider bus (if supported).
 629          */
 630         if ((host->caps & MMC_CAP_4_BIT_DATA) &&
 631                 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 632                 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 633                 if (err)
 634                         goto free_card;
 635
 636                 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
 637         }
 638
 639         host->card = card;
 640         return 0;
 641
 642 free_card:
 643         if (!oldcard)
 644                 mmc_remove_card(card);
 645
 646         return err;
 647 }
 648
 649 /*
 650  * Host is being removed. Free up the current card.
 651  */
 652 static void mmc_sd_remove(struct mmc_host *host)
 653 {
 654         BUG_ON(!host);
 655         BUG_ON(!host->card);
 656
 657         mmc_remove_card(host->card);
 658         host->card = NULL;
 659 }
 660
 661 /*
 662  * Card detection callback from host.
 663  */
 664 static void mmc_sd_detect(struct mmc_host *host)
 665 {
 666         int err;
 667
 668         BUG_ON(!host);
 669         BUG_ON(!host->card);
 670
 671         mmc_claim_host(host);
 672
 673         /*
 674          * Just check if our card has been removed.
 675          */
 676         err = mmc_send_status(host->card, NULL);
 677
 678         mmc_release_host(host);
 679
 680         if (err) {
 681                 mmc_sd_remove(host);
 682
 683                 mmc_claim_host(host);
 684                 mmc_detach_bus(host);
 685                 mmc_release_host(host);
 686         }
 687 }
 688
 689 /*
 690  * Suspend callback from host.
 691  */
 692 static int mmc_sd_suspend(struct mmc_host *host)
 693 {
 694         BUG_ON(!host);
 695         BUG_ON(!host->card);
 696
 697         mmc_claim_host(host);
 698         if (!mmc_host_is_spi(host))
 699                 mmc_deselect_cards(host);
 700         host->card->state &= ~MMC_STATE_HIGHSPEED;
 701         mmc_release_host(host);
 702
 703         return 0;
 704 }
 705
 706 /*
 707  * Resume callback from host.
 708  *
 709  * This function tries to determine if the same card is still present
 710  * and, if so, restore all state to it.
 711  */
 712 static int mmc_sd_resume(struct mmc_host *host)
 713 {
 714         int err;
 715
 716         BUG_ON(!host);
 717         BUG_ON(!host->card);
 718
 719         mmc_claim_host(host);
 720         err = mmc_sd_init_card(host, host->ocr, host->card);
 721         mmc_release_host(host);
 722
 723         return err;
 724 }
 725
 726 static int mmc_sd_power_restore(struct mmc_host *host)
 727 {
 728         int ret;
 729
 730         host->card->state &= ~MMC_STATE_HIGHSPEED;
 731         mmc_claim_host(host);
 732         ret = mmc_sd_init_card(host, host->ocr, host->card);
 733         mmc_release_host(host);
 734
 735         return ret;
 736 }
 737
 738 static const struct mmc_bus_ops mmc_sd_ops = {
 739         .remove = mmc_sd_remove,
 740         .detect = mmc_sd_detect,
 741         .suspend = NULL,
 742         .resume = NULL,
 743         .power_restore = mmc_sd_power_restore,
 744 };
 745
 746 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
 747         .remove = mmc_sd_remove,
 748         .detect = mmc_sd_detect,
 749         .suspend = mmc_sd_suspend,
 750         .resume = mmc_sd_resume,
 751         .power_restore = mmc_sd_power_restore,
 752 };
 753
 754 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
 755 {
 756         const struct mmc_bus_ops *bus_ops;
 757
 758         if (!mmc_card_is_removable(host))
 759                 bus_ops = &mmc_sd_ops_unsafe;
 760         else
 761                 bus_ops = &mmc_sd_ops;
 762         mmc_attach_bus(host, bus_ops);
 763 }
 764
 765 /*
 766  * Starting point for SD card init.
 767  */
 768 int mmc_attach_sd(struct mmc_host *host)
 769 {
 770         int err;
 771         u32 ocr;
 772
 773         BUG_ON(!host);
 774         WARN_ON(!host->claimed);
 775
 776         err = mmc_send_app_op_cond(host, 0, &ocr);
 777         if (err)
 778                 return err;
 779
 780         mmc_sd_attach_bus_ops(host);
 781         if (host->ocr_avail_sd)
 782                 host->ocr_avail = host->ocr_avail_sd;
 783
 784         /*
 785          * We need to get OCR a different way for SPI.
 786          */
 787         if (mmc_host_is_spi(host)) {
 788                 mmc_go_idle(host);
 789
 790                 err = mmc_spi_read_ocr(host, 0, &ocr);
 791                 if (err)
 792                         goto err;
 793         }
 794
 795         /*
 796          * Sanity check the voltages that the card claims to
 797          * support.
 798          */
 799         if (ocr & 0x7F) {
 800                 printk(KERN_WARNING "%s: card claims to support voltages "
 801                        "below the defined range. These will be ignored.\n",
 802                        mmc_hostname(host));
 803                 ocr &= ~0x7F;
 804         }
 805
 806         if ((ocr & MMC_VDD_165_195) &&
 807             !(host->ocr_avail_sd & MMC_VDD_165_195)) {
 808                 printk(KERN_WARNING "%s: SD card claims to support the "
 809                        "incompletely defined 'low voltage range'. This "
 810                        "will be ignored.\n", mmc_hostname(host));
 811                 ocr &= ~MMC_VDD_165_195;
 812         }
 813
 814         host->ocr = mmc_select_voltage(host, ocr);
 815
 816         /*
 817          * Can we support the voltage(s) of the card(s)?
 818          */
 819         if (!host->ocr) {
 820                 err = -EINVAL;
 821                 goto err;
 822         }
 823
 824         /*
 825          * Detect and init the card.
 826          */
 827         err = mmc_sd_init_card(host, host->ocr, NULL);
 828         if (err)
 829                 goto err;
 830
 831         mmc_release_host(host);
 832         err = mmc_add_card(host->card);
 833         mmc_claim_host(host);
 834         if (err)
 835                 goto remove_card;
 836
 837         return 0;
 838
 839 remove_card:
 840         mmc_release_host(host);
 841         mmc_remove_card(host->card);
 842         host->card = NULL;
 843         mmc_claim_host(host);
 844 err:
 845         mmc_detach_bus(host);
 846
 847         printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
 848                 mmc_hostname(host), err);
 849
 850         return err;
 851 }
 852