drivers/mmc/core/mmc.c

   1 /*
   2  *  linux/drivers/mmc/core/mmc.c
   3  *
   4  *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
   5  *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
   6  *  MMCv4 support Copyright (C) 2006 Philip Langdale, 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
  20 #include "core.h"
  21 #include "bus.h"
  22 #include "mmc_ops.h"
  23
  24 static const unsigned int tran_exp[] = {
  25         10000,          100000,         1000000,        10000000,
  26         0,              0,              0,              0
  27 };
  28
  29 static const unsigned char tran_mant[] = {
  30         0,      10,     12,     13,     15,     20,     25,     30,
  31         35,     40,     45,     50,     55,     60,     70,     80,
  32 };
  33
  34 static const unsigned int tacc_exp[] = {
  35         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  36 };
  37
  38 static const unsigned int tacc_mant[] = {
  39         0,      10,     12,     13,     15,     20,     25,     30,
  40         35,     40,     45,     50,     55,     60,     70,     80,
  41 };
  42
  43 #define UNSTUFF_BITS(resp,start,size)                                   \
  44         ({                                                              \
  45                 const int __size = size;                                \
  46                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  47                 const int __off = 3 - ((start) / 32);                   \
  48                 const int __shft = (start) & 31;                        \
  49                 u32 __res;                                              \
  50                                                                         \
  51                 __res = resp[__off] >> __shft;                          \
  52                 if (__size + __shft > 32)                               \
  53                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  54                 __res & __mask;                                         \
  55         })
  56
  57 /*
  58  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  59  */
  60 static int mmc_decode_cid(struct mmc_card *card)
  61 {
  62         u32 *resp = card->raw_cid;
  63
  64         /*
  65          * The selection of the format here is based upon published
  66          * specs from sandisk and from what people have reported.
  67          */
  68         switch (card->csd.mmca_vsn) {
  69         case 0: /* MMC v1.0 - v1.2 */
  70         case 1: /* MMC v1.4 */
  71                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  72                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  73                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  74                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  75                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  76                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  77                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  78                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  79                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  80                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  81                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  82                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  83                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  84                 break;
  85
  86         case 2: /* MMC v2.0 - v2.2 */
  87         case 3: /* MMC v3.1 - v3.3 */
  88         case 4: /* MMC v4 */
  89                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
  90                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
  91                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  92                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  93                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  94                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  95                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  96                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  97                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
  98                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  99                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 100                 break;
 101
 102         default:
 103                 printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
 104                         mmc_hostname(card->host), card->csd.mmca_vsn);
 105                 return -EINVAL;
 106         }
 107
 108         return 0;
 109 }
 110
 111 static void mmc_set_erase_size(struct mmc_card *card)
 112 {
 113         if (card->ext_csd.erase_group_def & 1)
 114                 card->erase_size = card->ext_csd.hc_erase_size;
 115         else
 116                 card->erase_size = card->csd.erase_size;
 117
 118         mmc_init_erase(card);
 119 }
 120
 121 /*
 122  * Given a 128-bit response, decode to our card CSD structure.
 123  */
 124 static int mmc_decode_csd(struct mmc_card *card)
 125 {
 126         struct mmc_csd *csd = &card->csd;
 127         unsigned int e, m, a, b;
 128         u32 *resp = card->raw_csd;
 129
 130         /*
 131          * We only understand CSD structure v1.1 and v1.2.
 132          * v1.2 has extra information in bits 15, 11 and 10.
 133          * We also support eMMC v4.4 & v4.41.
 134          */
 135         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 136         if (csd->structure == 0) {
 137                 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
 138                         mmc_hostname(card->host), csd->structure);
 139                 return -EINVAL;
 140         }
 141
 142         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 143         m = UNSTUFF_BITS(resp, 115, 4);
 144         e = UNSTUFF_BITS(resp, 112, 3);
 145         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 146         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 147
 148         m = UNSTUFF_BITS(resp, 99, 4);
 149         e = UNSTUFF_BITS(resp, 96, 3);
 150         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 151         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 152
 153         e = UNSTUFF_BITS(resp, 47, 3);
 154         m = UNSTUFF_BITS(resp, 62, 12);
 155         csd->capacity     = (1 + m) << (e + 2);
 156
 157         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 158         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 159         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 160         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 161         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 162         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 163         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 164
 165         if (csd->write_blkbits >= 9) {
 166                 a = UNSTUFF_BITS(resp, 42, 5);
 167                 b = UNSTUFF_BITS(resp, 37, 5);
 168                 csd->erase_size = (a + 1) * (b + 1);
 169                 csd->erase_size <<= csd->write_blkbits - 9;
 170         }
 171
 172         return 0;
 173 }
 174
 175 /*
 176  * Read and decode extended CSD.
 177  */
 178 static int mmc_read_ext_csd(struct mmc_card *card)
 179 {
 180         int err;
 181         u8 *ext_csd;
 182
 183         BUG_ON(!card);
 184
 185         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 186                 return 0;
 187
 188         /*
 189          * As the ext_csd is so large and mostly unused, we don't store the
 190          * raw block in mmc_card.
 191          */
 192         ext_csd = kmalloc(512, GFP_KERNEL);
 193         if (!ext_csd) {
 194                 printk(KERN_ERR "%s: could not allocate a buffer to "
 195                         "receive the ext_csd.\n", mmc_hostname(card->host));
 196                 return -ENOMEM;
 197         }
 198
 199         err = mmc_send_ext_csd(card, ext_csd);
 200         if (err) {
 201                 /* If the host or the card can't do the switch,
 202                  * fail more gracefully. */
 203                 if ((err != -EINVAL)
 204                  && (err != -ENOSYS)
 205                  && (err != -EFAULT))
 206                         goto out;
 207
 208                 /*
 209                  * High capacity cards should have this "magic" size
 210                  * stored in their CSD.
 211                  */
 212                 if (card->csd.capacity == (4096 * 512)) {
 213                         printk(KERN_ERR "%s: unable to read EXT_CSD "
 214                                 "on a possible high capacity card. "
 215                                 "Card will be ignored.\n",
 216                                 mmc_hostname(card->host));
 217                 } else {
 218                         printk(KERN_WARNING "%s: unable to read "
 219                                 "EXT_CSD, performance might "
 220                                 "suffer.\n",
 221                                 mmc_hostname(card->host));
 222                         err = 0;
 223                 }
 224
 225                 goto out;
 226         }
 227
 228         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 229         if (card->csd.structure == 3) {
 230                 int ext_csd_struct = ext_csd[EXT_CSD_STRUCTURE];
 231                 if (ext_csd_struct > 2) {
 232                         printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
 233                                 "version %d\n", mmc_hostname(card->host),
 234                                         ext_csd_struct);
 235                         err = -EINVAL;
 236                         goto out;
 237                 }
 238         }
 239
 240         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 241         if (card->ext_csd.rev > 5) {
 242                 printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
 243                         mmc_hostname(card->host), card->ext_csd.rev);
 244                 err = -EINVAL;
 245                 goto out;
 246         }
 247
 248         if (card->ext_csd.rev >= 2) {
 249                 card->ext_csd.sectors =
 250                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 251                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 252                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 253                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 254
 255                 /* Cards with density > 2GiB are sector addressed */
 256                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 257                         mmc_card_set_blockaddr(card);
 258         }
 259
 260         switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
 261         case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
 262              EXT_CSD_CARD_TYPE_26:
 263                 card->ext_csd.hs_max_dtr = 52000000;
 264                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
 265                 break;
 266         case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
 267              EXT_CSD_CARD_TYPE_26:
 268                 card->ext_csd.hs_max_dtr = 52000000;
 269                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
 270                 break;
 271         case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
 272              EXT_CSD_CARD_TYPE_26:
 273                 card->ext_csd.hs_max_dtr = 52000000;
 274                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
 275                 break;
 276         case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
 277                 card->ext_csd.hs_max_dtr = 52000000;
 278                 break;
 279         case EXT_CSD_CARD_TYPE_26:
 280                 card->ext_csd.hs_max_dtr = 26000000;
 281                 break;
 282         default:
 283                 /* MMC v4 spec says this cannot happen */
 284                 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
 285                         "support any high-speed modes.\n",
 286                         mmc_hostname(card->host));
 287         }
 288
 289         if (card->ext_csd.rev >= 3) {
 290                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 291
 292                 /* Sleep / awake timeout in 100ns units */
 293                 if (sa_shift > 0 && sa_shift <= 0x17)
 294                         card->ext_csd.sa_timeout =
 295                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 296                 card->ext_csd.erase_group_def =
 297                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 298                 card->ext_csd.hc_erase_timeout = 300 *
 299                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 300                 card->ext_csd.hc_erase_size =
 301                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 302         }
 303
 304         if (card->ext_csd.rev >= 4) {
 305                 /*
 306                  * Enhanced area feature support -- check whether the eMMC
 307                  * card has the Enhanced area enabled.  If so, export enhanced
 308                  * area offset and size to user by adding sysfs interface.
 309                  */
 310                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 311                                 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 312                         u8 hc_erase_grp_sz =
 313                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 314                         u8 hc_wp_grp_sz =
 315                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 316
 317                         card->ext_csd.enhanced_area_en = 1;
 318                         /*
 319                          * calculate the enhanced data area offset, in bytes
 320                          */
 321                         card->ext_csd.enhanced_area_offset =
 322                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
 323                                 (ext_csd[137] << 8) + ext_csd[136];
 324                         if (mmc_card_blockaddr(card))
 325                                 card->ext_csd.enhanced_area_offset <<= 9;
 326                         /*
 327                          * calculate the enhanced data area size, in kilobytes
 328                          */
 329                         card->ext_csd.enhanced_area_size =
 330                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 331                                 ext_csd[140];
 332                         card->ext_csd.enhanced_area_size *=
 333                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 334                         card->ext_csd.enhanced_area_size <<= 9;
 335                 } else {
 336                         /*
 337                          * If the enhanced area is not enabled, disable these
 338                          * device attributes.
 339                          */
 340                         card->ext_csd.enhanced_area_offset = -EINVAL;
 341                         card->ext_csd.enhanced_area_size = -EINVAL;
 342                 }
 343                 card->ext_csd.sec_trim_mult =
 344                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 345                 card->ext_csd.sec_erase_mult =
 346                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 347                 card->ext_csd.sec_feature_support =
 348                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 349                 card->ext_csd.trim_timeout = 300 *
 350                         ext_csd[EXT_CSD_TRIM_MULT];
 351         }
 352
 353         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 354                 card->erased_byte = 0xFF;
 355         else
 356                 card->erased_byte = 0x0;
 357
 358 out:
 359         kfree(ext_csd);
 360
 361         return err;
 362 }
 363
 364 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 365         card->raw_cid[2], card->raw_cid[3]);
 366 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 367         card->raw_csd[2], card->raw_csd[3]);
 368 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 369 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 370 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 371 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 372 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 373 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 374 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 375 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 376 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 377 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 378                 card->ext_csd.enhanced_area_offset);
 379 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 380
 381 static struct attribute *mmc_std_attrs[] = {
 382         &dev_attr_cid.attr,
 383         &dev_attr_csd.attr,
 384         &dev_attr_date.attr,
 385         &dev_attr_erase_size.attr,
 386         &dev_attr_preferred_erase_size.attr,
 387         &dev_attr_fwrev.attr,
 388         &dev_attr_hwrev.attr,
 389         &dev_attr_manfid.attr,
 390         &dev_attr_name.attr,
 391         &dev_attr_oemid.attr,
 392         &dev_attr_serial.attr,
 393         &dev_attr_enhanced_area_offset.attr,
 394         &dev_attr_enhanced_area_size.attr,
 395         NULL,
 396 };
 397
 398 static struct attribute_group mmc_std_attr_group = {
 399         .attrs = mmc_std_attrs,
 400 };
 401
 402 static const struct attribute_group *mmc_attr_groups[] = {
 403         &mmc_std_attr_group,
 404         NULL,
 405 };
 406
 407 static struct device_type mmc_type = {
 408         .groups = mmc_attr_groups,
 409 };
 410
 411 /*
 412  * Handle the detection and initialisation of a card.
 413  *
 414  * In the case of a resume, "oldcard" will contain the card
 415  * we're trying to reinitialise.
 416  */
 417 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 418         struct mmc_card *oldcard)
 419 {
 420         struct mmc_card *card;
 421         int err, ddr = 0;
 422         u32 cid[4];
 423         unsigned int max_dtr;
 424
 425         BUG_ON(!host);
 426         WARN_ON(!host->claimed);
 427
 428         /*
 429          * Since we're changing the OCR value, we seem to
 430          * need to tell some cards to go back to the idle
 431          * state.  We wait 1ms to give cards time to
 432          * respond.
 433          */
 434         mmc_go_idle(host);
 435
 436         /* The extra bit indicates that we support high capacity */
 437         err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
 438         if (err)
 439                 goto err;
 440
 441         /*
 442          * For SPI, enable CRC as appropriate.
 443          */
 444         if (mmc_host_is_spi(host)) {
 445                 err = mmc_spi_set_crc(host, use_spi_crc);
 446                 if (err)
 447                         goto err;
 448         }
 449
 450         /*
 451          * Fetch CID from card.
 452          */
 453         if (mmc_host_is_spi(host))
 454                 err = mmc_send_cid(host, cid);
 455         else
 456                 err = mmc_all_send_cid(host, cid);
 457         if (err)
 458                 goto err;
 459
 460         if (oldcard) {
 461                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 462                         err = -ENOENT;
 463                         goto err;
 464                 }
 465
 466                 card = oldcard;
 467         } else {
 468                 /*
 469                  * Allocate card structure.
 470                  */
 471                 card = mmc_alloc_card(host, &mmc_type);
 472                 if (IS_ERR(card)) {
 473                         err = PTR_ERR(card);
 474                         goto err;
 475                 }
 476
 477                 card->type = MMC_TYPE_MMC;
 478                 card->rca = 1;
 479                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 480         }
 481
 482         /*
 483          * For native busses:  set card RCA and quit open drain mode.
 484          */
 485         if (!mmc_host_is_spi(host)) {
 486                 err = mmc_set_relative_addr(card);
 487                 if (err)
 488                         goto free_card;
 489
 490                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 491         }
 492
 493         if (!oldcard) {
 494                 /*
 495                  * Fetch CSD from card.
 496                  */
 497                 err = mmc_send_csd(card, card->raw_csd);
 498                 if (err)
 499                         goto free_card;
 500
 501                 err = mmc_decode_csd(card);
 502                 if (err)
 503                         goto free_card;
 504                 err = mmc_decode_cid(card);
 505                 if (err)
 506                         goto free_card;
 507         }
 508
 509         /*
 510          * Select card, as all following commands rely on that.
 511          */
 512         if (!mmc_host_is_spi(host)) {
 513                 err = mmc_select_card(card);
 514                 if (err)
 515                         goto free_card;
 516         }
 517
 518         if (!oldcard) {
 519                 /*
 520                  * Fetch and process extended CSD.
 521                  */
 522                 err = mmc_read_ext_csd(card);
 523                 if (err)
 524                         goto free_card;
 525                 /* Erase size depends on CSD and Extended CSD */
 526                 mmc_set_erase_size(card);
 527         }
 528
 529         /*
 530          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 531          * bit.  This bit will be lost everytime after a reset or power off.
 532          */
 533         if (card->ext_csd.enhanced_area_en) {
 534                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 535                                 EXT_CSD_ERASE_GROUP_DEF, 1);
 536
 537                 if (err && err != -EBADMSG)
 538                         goto free_card;
 539
 540                 if (err) {
 541                         err = 0;
 542                         /*
 543                          * Just disable enhanced area off & sz
 544                          * will try to enable ERASE_GROUP_DEF
 545                          * during next time reinit
 546                          */
 547                         card->ext_csd.enhanced_area_offset = -EINVAL;
 548                         card->ext_csd.enhanced_area_size = -EINVAL;
 549                 } else {
 550                         card->ext_csd.erase_group_def = 1;
 551                         /*
 552                          * enable ERASE_GRP_DEF successfully.
 553                          * This will affect the erase size, so
 554                          * here need to reset erase size
 555                          */
 556                         mmc_set_erase_size(card);
 557                 }
 558         }
 559
 560         /*
 561          * Activate high speed (if supported)
 562          */
 563         if ((card->ext_csd.hs_max_dtr != 0) &&
 564                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
 565                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 566                         EXT_CSD_HS_TIMING, 1);
 567                 if (err && err != -EBADMSG)
 568                         goto free_card;
 569
 570                 if (err) {
 571                         printk(KERN_WARNING "%s: switch to highspeed failed\n",
 572                                mmc_hostname(card->host));
 573                         err = 0;
 574                 } else {
 575                         mmc_card_set_highspeed(card);
 576                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
 577                 }
 578         }
 579
 580         /*
 581          * Compute bus speed.
 582          */
 583         max_dtr = (unsigned int)-1;
 584
 585         if (mmc_card_highspeed(card)) {
 586                 if (max_dtr > card->ext_csd.hs_max_dtr)
 587                         max_dtr = card->ext_csd.hs_max_dtr;
 588         } else if (max_dtr > card->csd.max_dtr) {
 589                 max_dtr = card->csd.max_dtr;
 590         }
 591
 592         mmc_set_clock(host, max_dtr);
 593
 594         /*
 595          * Indicate DDR mode (if supported).
 596          */
 597         if (mmc_card_highspeed(card)) {
 598                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
 599                         && (host->caps & (MMC_CAP_1_8V_DDR)))
 600                                 ddr = MMC_1_8V_DDR_MODE;
 601                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
 602                         && (host->caps & (MMC_CAP_1_2V_DDR)))
 603                                 ddr = MMC_1_2V_DDR_MODE;
 604         }
 605
 606         /*
 607          * Activate wide bus and DDR (if supported).
 608          */
 609         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
 610             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
 611                 static unsigned ext_csd_bits[][2] = {
 612                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
 613                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
 614                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
 615                 };
 616                 static unsigned bus_widths[] = {
 617                         MMC_BUS_WIDTH_8,
 618                         MMC_BUS_WIDTH_4,
 619                         MMC_BUS_WIDTH_1
 620                 };
 621                 unsigned idx, bus_width = 0;
 622
 623                 if (host->caps & MMC_CAP_8_BIT_DATA)
 624                         idx = 0;
 625                 else
 626                         idx = 1;
 627                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 628                         bus_width = bus_widths[idx];
 629                         if (bus_width == MMC_BUS_WIDTH_1)
 630                                 ddr = 0; /* no DDR for 1-bit width */
 631                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 632                                          EXT_CSD_BUS_WIDTH,
 633                                          ext_csd_bits[idx][0]);
 634                         if (!err) {
 635                                 mmc_set_bus_width_ddr(card->host,
 636                                                       bus_width, MMC_SDR_MODE);
 637                                 /*
 638                                  * If controller can't handle bus width test,
 639                                  * use the highest bus width to maintain
 640                                  * compatibility with previous MMC behavior.
 641                                  */
 642                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 643                                         break;
 644                                 err = mmc_bus_test(card, bus_width);
 645                                 if (!err)
 646                                         break;
 647                         }
 648                 }
 649
 650                 if (!err && ddr) {
 651                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 652                                         EXT_CSD_BUS_WIDTH,
 653                                         ext_csd_bits[idx][1]);
 654                 }
 655                 if (err) {
 656                         printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
 657                                 "failed\n", mmc_hostname(card->host),
 658                                 1 << bus_width, ddr);
 659                         goto free_card;
 660                 } else if (ddr) {
 661                         mmc_card_set_ddr_mode(card);
 662                         mmc_set_bus_width_ddr(card->host, bus_width, ddr);
 663                 }
 664         }
 665
 666         if (!oldcard)
 667                 host->card = card;
 668
 669         return 0;
 670
 671 free_card:
 672         if (!oldcard)
 673                 mmc_remove_card(card);
 674 err:
 675
 676         return err;
 677 }
 678
 679 /*
 680  * Host is being removed. Free up the current card.
 681  */
 682 static void mmc_remove(struct mmc_host *host)
 683 {
 684         BUG_ON(!host);
 685         BUG_ON(!host->card);
 686
 687         mmc_remove_card(host->card);
 688         host->card = NULL;
 689 }
 690
 691 /*
 692  * Card detection callback from host.
 693  */
 694 static void mmc_detect(struct mmc_host *host)
 695 {
 696         int err;
 697
 698         BUG_ON(!host);
 699         BUG_ON(!host->card);
 700
 701         mmc_claim_host(host);
 702
 703         /*
 704          * Just check if our card has been removed.
 705          */
 706         err = mmc_send_status(host->card, NULL);
 707
 708         mmc_release_host(host);
 709
 710         if (err) {
 711                 mmc_remove(host);
 712
 713                 mmc_claim_host(host);
 714                 mmc_detach_bus(host);
 715                 mmc_release_host(host);
 716         }
 717 }
 718
 719 /*
 720  * Suspend callback from host.
 721  */
 722 static int mmc_suspend(struct mmc_host *host)
 723 {
 724         BUG_ON(!host);
 725         BUG_ON(!host->card);
 726
 727         mmc_claim_host(host);
 728         if (!mmc_host_is_spi(host))
 729                 mmc_deselect_cards(host);
 730         host->card->state &= ~MMC_STATE_HIGHSPEED;
 731         mmc_release_host(host);
 732
 733         return 0;
 734 }
 735
 736 /*
 737  * Resume callback from host.
 738  *
 739  * This function tries to determine if the same card is still present
 740  * and, if so, restore all state to it.
 741  */
 742 static int mmc_resume(struct mmc_host *host)
 743 {
 744         int err;
 745
 746         BUG_ON(!host);
 747         BUG_ON(!host->card);
 748
 749         mmc_claim_host(host);
 750         err = mmc_init_card(host, host->ocr, host->card);
 751         mmc_release_host(host);
 752
 753         return err;
 754 }
 755
 756 static int mmc_power_restore(struct mmc_host *host)
 757 {
 758         int ret;
 759
 760         host->card->state &= ~MMC_STATE_HIGHSPEED;
 761         mmc_claim_host(host);
 762         ret = mmc_init_card(host, host->ocr, host->card);
 763         mmc_release_host(host);
 764
 765         return ret;
 766 }
 767
 768 static int mmc_sleep(struct mmc_host *host)
 769 {
 770         struct mmc_card *card = host->card;
 771         int err = -ENOSYS;
 772
 773         if (card && card->ext_csd.rev >= 3) {
 774                 err = mmc_card_sleepawake(host, 1);
 775                 if (err < 0)
 776                         pr_debug("%s: Error %d while putting card into sleep",
 777                                  mmc_hostname(host), err);
 778         }
 779
 780         return err;
 781 }
 782
 783 static int mmc_awake(struct mmc_host *host)
 784 {
 785         struct mmc_card *card = host->card;
 786         int err = -ENOSYS;
 787
 788         if (card && card->ext_csd.rev >= 3) {
 789                 err = mmc_card_sleepawake(host, 0);
 790                 if (err < 0)
 791                         pr_debug("%s: Error %d while awaking sleeping card",
 792                                  mmc_hostname(host), err);
 793         }
 794
 795         return err;
 796 }
 797
 798 static const struct mmc_bus_ops mmc_ops = {
 799         .awake = mmc_awake,
 800         .sleep = mmc_sleep,
 801         .remove = mmc_remove,
 802         .detect = mmc_detect,
 803         .suspend = NULL,
 804         .resume = NULL,
 805         .power_restore = mmc_power_restore,
 806 };
 807
 808 static const struct mmc_bus_ops mmc_ops_unsafe = {
 809         .awake = mmc_awake,
 810         .sleep = mmc_sleep,
 811         .remove = mmc_remove,
 812         .detect = mmc_detect,
 813         .suspend = mmc_suspend,
 814         .resume = mmc_resume,
 815         .power_restore = mmc_power_restore,
 816 };
 817
 818 static void mmc_attach_bus_ops(struct mmc_host *host)
 819 {
 820         const struct mmc_bus_ops *bus_ops;
 821
 822         if (!mmc_card_is_removable(host))
 823                 bus_ops = &mmc_ops_unsafe;
 824         else
 825                 bus_ops = &mmc_ops;
 826         mmc_attach_bus(host, bus_ops);
 827 }
 828
 829 /*
 830  * Starting point for MMC card init.
 831  */
 832 int mmc_attach_mmc(struct mmc_host *host)
 833 {
 834         int err;
 835         u32 ocr;
 836
 837         BUG_ON(!host);
 838         WARN_ON(!host->claimed);
 839
 840         err = mmc_send_op_cond(host, 0, &ocr);
 841         if (err)
 842                 return err;
 843
 844         mmc_attach_bus_ops(host);
 845         if (host->ocr_avail_mmc)
 846                 host->ocr_avail = host->ocr_avail_mmc;
 847
 848         /*
 849          * We need to get OCR a different way for SPI.
 850          */
 851         if (mmc_host_is_spi(host)) {
 852                 err = mmc_spi_read_ocr(host, 1, &ocr);
 853                 if (err)
 854                         goto err;
 855         }
 856
 857         /*
 858          * Sanity check the voltages that the card claims to
 859          * support.
 860          */
 861         if (ocr & 0x7F) {
 862                 printk(KERN_WARNING "%s: card claims to support voltages "
 863                        "below the defined range. These will be ignored.\n",
 864                        mmc_hostname(host));
 865                 ocr &= ~0x7F;
 866         }
 867
 868         host->ocr = mmc_select_voltage(host, ocr);
 869
 870         /*
 871          * Can we support the voltage of the card?
 872          */
 873         if (!host->ocr) {
 874                 err = -EINVAL;
 875                 goto err;
 876         }
 877
 878         /*
 879          * Detect and init the card.
 880          */
 881         err = mmc_init_card(host, host->ocr, NULL);
 882         if (err)
 883                 goto err;
 884
 885         mmc_release_host(host);
 886         err = mmc_add_card(host->card);
 887         mmc_claim_host(host);
 888         if (err)
 889                 goto remove_card;
 890
 891         return 0;
 892
 893 remove_card:
 894         mmc_release_host(host);
 895         mmc_remove_card(host->card);
 896         mmc_claim_host(host);
 897         host->card = NULL;
 898 err:
 899         mmc_detach_bus(host);
 900
 901         printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
 902                 mmc_hostname(host), err);
 903
 904         return err;
 905 }