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 #include "sd_ops.h"
  24
  25 static const unsigned int tran_exp[] = {
  26         10000,          100000,         1000000,        10000000,
  27         0,              0,              0,              0
  28 };
  29
  30 static const unsigned char tran_mant[] = {
  31         0,      10,     12,     13,     15,     20,     25,     30,
  32         35,     40,     45,     50,     55,     60,     70,     80,
  33 };
  34
  35 static const unsigned int tacc_exp[] = {
  36         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  37 };
  38
  39 static const unsigned int tacc_mant[] = {
  40         0,      10,     12,     13,     15,     20,     25,     30,
  41         35,     40,     45,     50,     55,     60,     70,     80,
  42 };
  43
  44 #define UNSTUFF_BITS(resp,start,size)                                   \
  45         ({                                                              \
  46                 const int __size = size;                                \
  47                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  48                 const int __off = 3 - ((start) / 32);                   \
  49                 const int __shft = (start) & 31;                        \
  50                 u32 __res;                                              \
  51                                                                         \
  52                 __res = resp[__off] >> __shft;                          \
  53                 if (__size + __shft > 32)                               \
  54                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  55                 __res & __mask;                                         \
  56         })
  57
  58 /*
  59  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  60  */
  61 static int mmc_decode_cid(struct mmc_card *card)
  62 {
  63         u32 *resp = card->raw_cid;
  64
  65         /*
  66          * The selection of the format here is based upon published
  67          * specs from sandisk and from what people have reported.
  68          */
  69         switch (card->csd.mmca_vsn) {
  70         case 0: /* MMC v1.0 - v1.2 */
  71         case 1: /* MMC v1.4 */
  72                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  73                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  74                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  75                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  76                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  77                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  78                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  79                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  80                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  81                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  82                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  83                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  84                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  85                 break;
  86
  87         case 2: /* MMC v2.0 - v2.2 */
  88         case 3: /* MMC v3.1 - v3.3 */
  89         case 4: /* MMC v4 */
  90                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
  91                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
  92                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  93                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  94                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  95                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  96                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  97                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  98                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
  99                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 100                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 101                 break;
 102
 103         default:
 104                 printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
 105                         mmc_hostname(card->host), card->csd.mmca_vsn);
 106                 return -EINVAL;
 107         }
 108
 109         return 0;
 110 }
 111
 112 static void mmc_set_erase_size(struct mmc_card *card)
 113 {
 114         if (card->ext_csd.erase_group_def & 1)
 115                 card->erase_size = card->ext_csd.hc_erase_size;
 116         else
 117                 card->erase_size = card->csd.erase_size;
 118
 119         mmc_init_erase(card);
 120 }
 121
 122 /*
 123  * Given a 128-bit response, decode to our card CSD structure.
 124  */
 125 static int mmc_decode_csd(struct mmc_card *card)
 126 {
 127         struct mmc_csd *csd = &card->csd;
 128         unsigned int e, m, a, b;
 129         u32 *resp = card->raw_csd;
 130
 131         /*
 132          * We only understand CSD structure v1.1 and v1.2.
 133          * v1.2 has extra information in bits 15, 11 and 10.
 134          * We also support eMMC v4.4 & v4.41.
 135          */
 136         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 137         if (csd->structure == 0) {
 138                 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
 139                         mmc_hostname(card->host), csd->structure);
 140                 return -EINVAL;
 141         }
 142
 143         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 144         m = UNSTUFF_BITS(resp, 115, 4);
 145         e = UNSTUFF_BITS(resp, 112, 3);
 146         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 147         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 148
 149         m = UNSTUFF_BITS(resp, 99, 4);
 150         e = UNSTUFF_BITS(resp, 96, 3);
 151         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 152         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 153
 154         e = UNSTUFF_BITS(resp, 47, 3);
 155         m = UNSTUFF_BITS(resp, 62, 12);
 156         csd->capacity     = (1 + m) << (e + 2);
 157
 158         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 159         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 160         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 161         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 162         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 163         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 164         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 165
 166         if (csd->write_blkbits >= 9) {
 167                 a = UNSTUFF_BITS(resp, 42, 5);
 168                 b = UNSTUFF_BITS(resp, 37, 5);
 169                 csd->erase_size = (a + 1) * (b + 1);
 170                 csd->erase_size <<= csd->write_blkbits - 9;
 171         }
 172
 173         return 0;
 174 }
 175
 176 /*
 177  * Read extended CSD.
 178  */
 179 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
 180 {
 181         int err;
 182         u8 *ext_csd;
 183
 184         BUG_ON(!card);
 185         BUG_ON(!new_ext_csd);
 186
 187         *new_ext_csd = NULL;
 188
 189         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 190                 return 0;
 191
 192         /*
 193          * As the ext_csd is so large and mostly unused, we don't store the
 194          * raw block in mmc_card.
 195          */
 196         ext_csd = kmalloc(512, GFP_KERNEL);
 197         if (!ext_csd) {
 198                 printk(KERN_ERR "%s: could not allocate a buffer to "
 199                         "receive the ext_csd.\n", mmc_hostname(card->host));
 200                 return -ENOMEM;
 201         }
 202
 203         err = mmc_send_ext_csd(card, ext_csd);
 204         if (err) {
 205                 kfree(ext_csd);
 206                 *new_ext_csd = NULL;
 207
 208                 /* If the host or the card can't do the switch,
 209                  * fail more gracefully. */
 210                 if ((err != -EINVAL)
 211                  && (err != -ENOSYS)
 212                  && (err != -EFAULT))
 213                         return err;
 214
 215                 /*
 216                  * High capacity cards should have this "magic" size
 217                  * stored in their CSD.
 218                  */
 219                 if (card->csd.capacity == (4096 * 512)) {
 220                         printk(KERN_ERR "%s: unable to read EXT_CSD "
 221                                 "on a possible high capacity card. "
 222                                 "Card will be ignored.\n",
 223                                 mmc_hostname(card->host));
 224                 } else {
 225                         printk(KERN_WARNING "%s: unable to read "
 226                                 "EXT_CSD, performance might "
 227                                 "suffer.\n",
 228                                 mmc_hostname(card->host));
 229                         err = 0;
 230                 }
 231         } else
 232                 *new_ext_csd = ext_csd;
 233
 234         return err;
 235 }
 236
 237 /*
 238  * Decode extended CSD.
 239  */
 240 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 241 {
 242         int err = 0, idx;
 243         unsigned int part_size;
 244         u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
 245
 246         BUG_ON(!card);
 247
 248         if (!ext_csd)
 249                 return 0;
 250
 251         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 252         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 253         if (card->csd.structure == 3) {
 254                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 255                         printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
 256                                 "version %d\n", mmc_hostname(card->host),
 257                                         card->ext_csd.raw_ext_csd_structure);
 258                         err = -EINVAL;
 259                         goto out;
 260                 }
 261         }
 262
 263         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 264         if (card->ext_csd.rev > 6) {
 265                 printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
 266                         mmc_hostname(card->host), card->ext_csd.rev);
 267                 err = -EINVAL;
 268                 goto out;
 269         }
 270
 271         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 272         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 273         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 274         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 275         if (card->ext_csd.rev >= 2) {
 276                 card->ext_csd.sectors =
 277                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 278                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 279                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 280                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 281
 282                 /* Cards with density > 2GiB are sector addressed */
 283                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 284                         mmc_card_set_blockaddr(card);
 285         }
 286         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 287         switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
 288         case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
 289              EXT_CSD_CARD_TYPE_26:
 290                 card->ext_csd.hs_max_dtr = 52000000;
 291                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
 292                 break;
 293         case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
 294              EXT_CSD_CARD_TYPE_26:
 295                 card->ext_csd.hs_max_dtr = 52000000;
 296                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
 297                 break;
 298         case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
 299              EXT_CSD_CARD_TYPE_26:
 300                 card->ext_csd.hs_max_dtr = 52000000;
 301                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
 302                 break;
 303         case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
 304                 card->ext_csd.hs_max_dtr = 52000000;
 305                 break;
 306         case EXT_CSD_CARD_TYPE_26:
 307                 card->ext_csd.hs_max_dtr = 26000000;
 308                 break;
 309         default:
 310                 /* MMC v4 spec says this cannot happen */
 311                 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
 312                         "support any high-speed modes.\n",
 313                         mmc_hostname(card->host));
 314         }
 315
 316         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 317         card->ext_csd.raw_erase_timeout_mult =
 318                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 319         card->ext_csd.raw_hc_erase_grp_size =
 320                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 321         if (card->ext_csd.rev >= 3) {
 322                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 323                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 324
 325                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 326                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 327
 328                 /* Sleep / awake timeout in 100ns units */
 329                 if (sa_shift > 0 && sa_shift <= 0x17)
 330                         card->ext_csd.sa_timeout =
 331                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 332                 card->ext_csd.erase_group_def =
 333                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 334                 card->ext_csd.hc_erase_timeout = 300 *
 335                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 336                 card->ext_csd.hc_erase_size =
 337                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 338
 339                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 340
 341                 /*
 342                  * There are two boot regions of equal size, defined in
 343                  * multiples of 128K.
 344                  */
 345                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 346                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 347                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 348                                 mmc_part_add(card, part_size,
 349                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 350                                         "boot%d", idx, true);
 351                         }
 352                 }
 353         }
 354
 355         card->ext_csd.raw_hc_erase_gap_size =
 356                 ext_csd[EXT_CSD_PARTITION_ATTRIBUTE];
 357         card->ext_csd.raw_sec_trim_mult =
 358                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 359         card->ext_csd.raw_sec_erase_mult =
 360                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 361         card->ext_csd.raw_sec_feature_support =
 362                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 363         card->ext_csd.raw_trim_mult =
 364                 ext_csd[EXT_CSD_TRIM_MULT];
 365         if (card->ext_csd.rev >= 4) {
 366                 /*
 367                  * Enhanced area feature support -- check whether the eMMC
 368                  * card has the Enhanced area enabled.  If so, export enhanced
 369                  * area offset and size to user by adding sysfs interface.
 370                  */
 371                 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 372                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 373                     (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 374                         hc_erase_grp_sz =
 375                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 376                         hc_wp_grp_sz =
 377                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 378
 379                         card->ext_csd.enhanced_area_en = 1;
 380                         /*
 381                          * calculate the enhanced data area offset, in bytes
 382                          */
 383                         card->ext_csd.enhanced_area_offset =
 384                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
 385                                 (ext_csd[137] << 8) + ext_csd[136];
 386                         if (mmc_card_blockaddr(card))
 387                                 card->ext_csd.enhanced_area_offset <<= 9;
 388                         /*
 389                          * calculate the enhanced data area size, in kilobytes
 390                          */
 391                         card->ext_csd.enhanced_area_size =
 392                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 393                                 ext_csd[140];
 394                         card->ext_csd.enhanced_area_size *=
 395                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 396                         card->ext_csd.enhanced_area_size <<= 9;
 397                 } else {
 398                         /*
 399                          * If the enhanced area is not enabled, disable these
 400                          * device attributes.
 401                          */
 402                         card->ext_csd.enhanced_area_offset = -EINVAL;
 403                         card->ext_csd.enhanced_area_size = -EINVAL;
 404                 }
 405
 406                 /*
 407                  * General purpose partition feature support --
 408                  * If ext_csd has the size of general purpose partitions,
 409                  * set size, part_cfg, partition name in mmc_part.
 410                  */
 411                 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 412                         EXT_CSD_PART_SUPPORT_PART_EN) {
 413                         if (card->ext_csd.enhanced_area_en != 1) {
 414                                 hc_erase_grp_sz =
 415                                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 416                                 hc_wp_grp_sz =
 417                                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 418
 419                                 card->ext_csd.enhanced_area_en = 1;
 420                         }
 421
 422                         for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 423                                 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 424                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 425                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 426                                         continue;
 427                                 part_size =
 428                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 429                                         << 16) +
 430                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 431                                         << 8) +
 432                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 433                                 part_size *= (size_t)(hc_erase_grp_sz *
 434                                         hc_wp_grp_sz);
 435                                 mmc_part_add(card, part_size << 19,
 436                                         EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 437                                         "gp%d", idx, false);
 438                         }
 439                 }
 440                 card->ext_csd.sec_trim_mult =
 441                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 442                 card->ext_csd.sec_erase_mult =
 443                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 444                 card->ext_csd.sec_feature_support =
 445                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 446                 card->ext_csd.trim_timeout = 300 *
 447                         ext_csd[EXT_CSD_TRIM_MULT];
 448         }
 449
 450         if (card->ext_csd.rev >= 5) {
 451                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 452                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 453         }
 454
 455         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 456         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 457                 card->erased_byte = 0xFF;
 458         else
 459                 card->erased_byte = 0x0;
 460
 461 out:
 462         return err;
 463 }
 464
 465 static inline void mmc_free_ext_csd(u8 *ext_csd)
 466 {
 467         kfree(ext_csd);
 468 }
 469
 470
 471 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 472 {
 473         u8 *bw_ext_csd;
 474         int err;
 475
 476         if (bus_width == MMC_BUS_WIDTH_1)
 477                 return 0;
 478
 479         err = mmc_get_ext_csd(card, &bw_ext_csd);
 480
 481         if (err || bw_ext_csd == NULL) {
 482                 if (bus_width != MMC_BUS_WIDTH_1)
 483                         err = -EINVAL;
 484                 goto out;
 485         }
 486
 487         if (bus_width == MMC_BUS_WIDTH_1)
 488                 goto out;
 489
 490         /* only compare read only fields */
 491         err = (!(card->ext_csd.raw_partition_support ==
 492                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 493                 (card->ext_csd.raw_erased_mem_count ==
 494                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 495                 (card->ext_csd.rev ==
 496                         bw_ext_csd[EXT_CSD_REV]) &&
 497                 (card->ext_csd.raw_ext_csd_structure ==
 498                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 499                 (card->ext_csd.raw_card_type ==
 500                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 501                 (card->ext_csd.raw_s_a_timeout ==
 502                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 503                 (card->ext_csd.raw_hc_erase_gap_size ==
 504                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 505                 (card->ext_csd.raw_erase_timeout_mult ==
 506                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 507                 (card->ext_csd.raw_hc_erase_grp_size ==
 508                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 509                 (card->ext_csd.raw_sec_trim_mult ==
 510                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 511                 (card->ext_csd.raw_sec_erase_mult ==
 512                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 513                 (card->ext_csd.raw_sec_feature_support ==
 514                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 515                 (card->ext_csd.raw_trim_mult ==
 516                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 517                 (card->ext_csd.raw_sectors[0] ==
 518                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 519                 (card->ext_csd.raw_sectors[1] ==
 520                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 521                 (card->ext_csd.raw_sectors[2] ==
 522                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 523                 (card->ext_csd.raw_sectors[3] ==
 524                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
 525         if (err)
 526                 err = -EINVAL;
 527
 528 out:
 529         mmc_free_ext_csd(bw_ext_csd);
 530         return err;
 531 }
 532
 533 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 534         card->raw_cid[2], card->raw_cid[3]);
 535 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 536         card->raw_csd[2], card->raw_csd[3]);
 537 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 538 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 539 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 540 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 541 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 542 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 543 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 544 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 545 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 546 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 547                 card->ext_csd.enhanced_area_offset);
 548 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 549
 550 static struct attribute *mmc_std_attrs[] = {
 551         &dev_attr_cid.attr,
 552         &dev_attr_csd.attr,
 553         &dev_attr_date.attr,
 554         &dev_attr_erase_size.attr,
 555         &dev_attr_preferred_erase_size.attr,
 556         &dev_attr_fwrev.attr,
 557         &dev_attr_hwrev.attr,
 558         &dev_attr_manfid.attr,
 559         &dev_attr_name.attr,
 560         &dev_attr_oemid.attr,
 561         &dev_attr_serial.attr,
 562         &dev_attr_enhanced_area_offset.attr,
 563         &dev_attr_enhanced_area_size.attr,
 564         NULL,
 565 };
 566
 567 static struct attribute_group mmc_std_attr_group = {
 568         .attrs = mmc_std_attrs,
 569 };
 570
 571 static const struct attribute_group *mmc_attr_groups[] = {
 572         &mmc_std_attr_group,
 573         NULL,
 574 };
 575
 576 static struct device_type mmc_type = {
 577         .groups = mmc_attr_groups,
 578 };
 579
 580 /*
 581  * Select the PowerClass for the current bus width
 582  * If power class is defined for 4/8 bit bus in the
 583  * extended CSD register, select it by executing the
 584  * mmc_switch command.
 585  */
 586 static int mmc_select_powerclass(struct mmc_card *card,
 587                 unsigned int bus_width, u8 *ext_csd)
 588 {
 589         int err = 0;
 590         unsigned int pwrclass_val;
 591         unsigned int index = 0;
 592         struct mmc_host *host;
 593
 594         BUG_ON(!card);
 595
 596         host = card->host;
 597         BUG_ON(!host);
 598
 599         if (ext_csd == NULL)
 600                 return 0;
 601
 602         /* Power class selection is supported for versions >= 4.0 */
 603         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 604                 return 0;
 605
 606         /* Power class values are defined only for 4/8 bit bus */
 607         if (bus_width == EXT_CSD_BUS_WIDTH_1)
 608                 return 0;
 609
 610         switch (1 << host->ios.vdd) {
 611         case MMC_VDD_165_195:
 612                 if (host->ios.clock <= 26000000)
 613                         index = EXT_CSD_PWR_CL_26_195;
 614                 else if (host->ios.clock <= 52000000)
 615                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 616                                 EXT_CSD_PWR_CL_52_195 :
 617                                 EXT_CSD_PWR_CL_DDR_52_195;
 618                 else if (host->ios.clock <= 200000000)
 619                         index = EXT_CSD_PWR_CL_200_195;
 620                 break;
 621         case MMC_VDD_32_33:
 622         case MMC_VDD_33_34:
 623         case MMC_VDD_34_35:
 624         case MMC_VDD_35_36:
 625                 if (host->ios.clock <= 26000000)
 626                         index = EXT_CSD_PWR_CL_26_360;
 627                 else if (host->ios.clock <= 52000000)
 628                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 629                                 EXT_CSD_PWR_CL_52_360 :
 630                                 EXT_CSD_PWR_CL_DDR_52_360;
 631                 else if (host->ios.clock <= 200000000)
 632                         index = EXT_CSD_PWR_CL_200_360;
 633                 break;
 634         default:
 635                 pr_warning("%s: Voltage range not supported "
 636                            "for power class.\n", mmc_hostname(host));
 637                 return -EINVAL;
 638         }
 639
 640         pwrclass_val = ext_csd[index];
 641
 642         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 643                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 644                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 645         else
 646                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 647                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 648
 649         /* If the power class is different from the default value */
 650         if (pwrclass_val > 0) {
 651                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 652                                  EXT_CSD_POWER_CLASS,
 653                                  pwrclass_val,
 654                                  0);
 655         }
 656
 657         return err;
 658 }
 659
 660 /*
 661  * Handle the detection and initialisation of a card.
 662  *
 663  * In the case of a resume, "oldcard" will contain the card
 664  * we're trying to reinitialise.
 665  */
 666 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 667         struct mmc_card *oldcard)
 668 {
 669         struct mmc_card *card;
 670         int err, ddr = 0;
 671         u32 cid[4];
 672         unsigned int max_dtr;
 673         u32 rocr;
 674         u8 *ext_csd = NULL;
 675
 676         BUG_ON(!host);
 677         WARN_ON(!host->claimed);
 678
 679         /* Set correct bus mode for MMC before attempting init */
 680         if (!mmc_host_is_spi(host))
 681                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 682
 683         /*
 684          * Since we're changing the OCR value, we seem to
 685          * need to tell some cards to go back to the idle
 686          * state.  We wait 1ms to give cards time to
 687          * respond.
 688          * mmc_go_idle is needed for eMMC that are asleep
 689          */
 690         mmc_go_idle(host);
 691
 692         /* The extra bit indicates that we support high capacity */
 693         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 694         if (err)
 695                 goto err;
 696
 697         /*
 698          * For SPI, enable CRC as appropriate.
 699          */
 700         if (mmc_host_is_spi(host)) {
 701                 err = mmc_spi_set_crc(host, use_spi_crc);
 702                 if (err)
 703                         goto err;
 704         }
 705
 706         /*
 707          * Fetch CID from card.
 708          */
 709         if (mmc_host_is_spi(host))
 710                 err = mmc_send_cid(host, cid);
 711         else
 712                 err = mmc_all_send_cid(host, cid);
 713         if (err)
 714                 goto err;
 715
 716         if (oldcard) {
 717                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 718                         err = -ENOENT;
 719                         goto err;
 720                 }
 721
 722                 card = oldcard;
 723         } else {
 724                 /*
 725                  * Allocate card structure.
 726                  */
 727                 card = mmc_alloc_card(host, &mmc_type);
 728                 if (IS_ERR(card)) {
 729                         err = PTR_ERR(card);
 730                         goto err;
 731                 }
 732
 733                 card->type = MMC_TYPE_MMC;
 734                 card->rca = 1;
 735                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 736         }
 737
 738         /*
 739          * For native busses:  set card RCA and quit open drain mode.
 740          */
 741         if (!mmc_host_is_spi(host)) {
 742                 err = mmc_set_relative_addr(card);
 743                 if (err)
 744                         goto free_card;
 745
 746                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 747         }
 748
 749         if (!oldcard) {
 750                 /*
 751                  * Fetch CSD from card.
 752                  */
 753                 err = mmc_send_csd(card, card->raw_csd);
 754                 if (err)
 755                         goto free_card;
 756
 757                 err = mmc_decode_csd(card);
 758                 if (err)
 759                         goto free_card;
 760                 err = mmc_decode_cid(card);
 761                 if (err)
 762                         goto free_card;
 763         }
 764
 765         /*
 766          * Select card, as all following commands rely on that.
 767          */
 768         if (!mmc_host_is_spi(host)) {
 769                 err = mmc_select_card(card);
 770                 if (err)
 771                         goto free_card;
 772         }
 773
 774         if (!oldcard) {
 775                 /*
 776                  * Fetch and process extended CSD.
 777                  */
 778
 779                 err = mmc_get_ext_csd(card, &ext_csd);
 780                 if (err)
 781                         goto free_card;
 782                 err = mmc_read_ext_csd(card, ext_csd);
 783                 if (err)
 784                         goto free_card;
 785
 786                 /* If doing byte addressing, check if required to do sector
 787                  * addressing.  Handle the case of <2GB cards needing sector
 788                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 789                  * ocr register has bit 30 set for sector addressing.
 790                  */
 791                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 792                         mmc_card_set_blockaddr(card);
 793
 794                 /* Erase size depends on CSD and Extended CSD */
 795                 mmc_set_erase_size(card);
 796         }
 797
 798         /*
 799          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 800          * bit.  This bit will be lost every time after a reset or power off.
 801          */
 802         if (card->ext_csd.enhanced_area_en) {
 803                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 804                                  EXT_CSD_ERASE_GROUP_DEF, 1, 0);
 805
 806                 if (err && err != -EBADMSG)
 807                         goto free_card;
 808
 809                 if (err) {
 810                         err = 0;
 811                         /*
 812                          * Just disable enhanced area off & sz
 813                          * will try to enable ERASE_GROUP_DEF
 814                          * during next time reinit
 815                          */
 816                         card->ext_csd.enhanced_area_offset = -EINVAL;
 817                         card->ext_csd.enhanced_area_size = -EINVAL;
 818                 } else {
 819                         card->ext_csd.erase_group_def = 1;
 820                         /*
 821                          * enable ERASE_GRP_DEF successfully.
 822                          * This will affect the erase size, so
 823                          * here need to reset erase size
 824                          */
 825                         mmc_set_erase_size(card);
 826                 }
 827         }
 828
 829         /*
 830          * Ensure eMMC user default partition is enabled
 831          */
 832         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
 833                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 834                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
 835                                  card->ext_csd.part_config,
 836                                  card->ext_csd.part_time);
 837                 if (err && err != -EBADMSG)
 838                         goto free_card;
 839         }
 840
 841         /*
 842          * Activate high speed (if supported)
 843          */
 844         if ((card->ext_csd.hs_max_dtr != 0) &&
 845                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
 846                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 847                                  EXT_CSD_HS_TIMING, 1, 0);
 848                 if (err && err != -EBADMSG)
 849                         goto free_card;
 850
 851                 if (err) {
 852                         printk(KERN_WARNING "%s: switch to highspeed failed\n",
 853                                mmc_hostname(card->host));
 854                         err = 0;
 855                 } else {
 856                         mmc_card_set_highspeed(card);
 857                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
 858                 }
 859         }
 860
 861         /*
 862          * Compute bus speed.
 863          */
 864         max_dtr = (unsigned int)-1;
 865
 866         if (mmc_card_highspeed(card)) {
 867                 if (max_dtr > card->ext_csd.hs_max_dtr)
 868                         max_dtr = card->ext_csd.hs_max_dtr;
 869         } else if (max_dtr > card->csd.max_dtr) {
 870                 max_dtr = card->csd.max_dtr;
 871         }
 872
 873         mmc_set_clock(host, max_dtr);
 874
 875         /*
 876          * Indicate DDR mode (if supported).
 877          */
 878         if (mmc_card_highspeed(card)) {
 879                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
 880                         && ((host->caps & (MMC_CAP_1_8V_DDR |
 881                              MMC_CAP_UHS_DDR50))
 882                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
 883                                 ddr = MMC_1_8V_DDR_MODE;
 884                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
 885                         && ((host->caps & (MMC_CAP_1_2V_DDR |
 886                              MMC_CAP_UHS_DDR50))
 887                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
 888                                 ddr = MMC_1_2V_DDR_MODE;
 889         }
 890
 891         /*
 892          * Activate wide bus and DDR (if supported).
 893          */
 894         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
 895             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
 896                 static unsigned ext_csd_bits[][2] = {
 897                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
 898                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
 899                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
 900                 };
 901                 static unsigned bus_widths[] = {
 902                         MMC_BUS_WIDTH_8,
 903                         MMC_BUS_WIDTH_4,
 904                         MMC_BUS_WIDTH_1
 905                 };
 906                 unsigned idx, bus_width = 0;
 907
 908                 if (host->caps & MMC_CAP_8_BIT_DATA)
 909                         idx = 0;
 910                 else
 911                         idx = 1;
 912                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 913                         bus_width = bus_widths[idx];
 914                         if (bus_width == MMC_BUS_WIDTH_1)
 915                                 ddr = 0; /* no DDR for 1-bit width */
 916                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
 917                                                     ext_csd);
 918                         if (err)
 919                                 pr_err("%s: power class selection to "
 920                                        "bus width %d failed\n",
 921                                        mmc_hostname(card->host),
 922                                        1 << bus_width);
 923
 924                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 925                                          EXT_CSD_BUS_WIDTH,
 926                                          ext_csd_bits[idx][0],
 927                                          0);
 928                         if (!err) {
 929                                 mmc_set_bus_width(card->host, bus_width);
 930
 931                                 /*
 932                                  * If controller can't handle bus width test,
 933                                  * compare ext_csd previously read in 1 bit mode
 934                                  * against ext_csd at new bus width
 935                                  */
 936                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 937                                         err = mmc_compare_ext_csds(card,
 938                                                 bus_width);
 939                                 else
 940                                         err = mmc_bus_test(card, bus_width);
 941                                 if (!err)
 942                                         break;
 943                         }
 944                 }
 945
 946                 if (!err && ddr) {
 947                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
 948                                                     ext_csd);
 949                         if (err)
 950                                 pr_err("%s: power class selection to "
 951                                        "bus width %d ddr %d failed\n",
 952                                        mmc_hostname(card->host),
 953                                        1 << bus_width, ddr);
 954
 955                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 956                                          EXT_CSD_BUS_WIDTH,
 957                                          ext_csd_bits[idx][1],
 958                                          0);
 959                 }
 960                 if (err) {
 961                         printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
 962                                 "failed\n", mmc_hostname(card->host),
 963                                 1 << bus_width, ddr);
 964                         goto free_card;
 965                 } else if (ddr) {
 966                         /*
 967                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
 968                          * signaling.
 969                          *
 970                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
 971                          *
 972                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
 973                          * in the JEDEC spec for DDR.
 974                          *
 975                          * Do not force change in vccq since we are obviously
 976                          * working and no change to vccq is needed.
 977                          *
 978                          * WARNING: eMMC rules are NOT the same as SD DDR
 979                          */
 980                         if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
 981                                 err = mmc_set_signal_voltage(host,
 982                                         MMC_SIGNAL_VOLTAGE_120, 0);
 983                                 if (err)
 984                                         goto err;
 985                         }
 986                         mmc_card_set_ddr_mode(card);
 987                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
 988                         mmc_set_bus_width(card->host, bus_width);
 989                 }
 990         }
 991
 992         if (!oldcard)
 993                 host->card = card;
 994
 995         mmc_free_ext_csd(ext_csd);
 996         return 0;
 997
 998 free_card:
 999         if (!oldcard)
1000                 mmc_remove_card(card);
1001 err:
1002         mmc_free_ext_csd(ext_csd);
1003
1004         return err;
1005 }
1006
1007 /*
1008  * Host is being removed. Free up the current card.
1009  */
1010 static void mmc_remove(struct mmc_host *host)
1011 {
1012         BUG_ON(!host);
1013         BUG_ON(!host->card);
1014
1015         mmc_remove_card(host->card);
1016         host->card = NULL;
1017 }
1018
1019 /*
1020  * Card detection callback from host.
1021  */
1022 static void mmc_detect(struct mmc_host *host)
1023 {
1024         int err;
1025
1026         BUG_ON(!host);
1027         BUG_ON(!host->card);
1028
1029         mmc_claim_host(host);
1030
1031         /*
1032          * Just check if our card has been removed.
1033          */
1034         err = mmc_send_status(host->card, NULL);
1035
1036         mmc_release_host(host);
1037
1038         if (err) {
1039                 mmc_remove(host);
1040
1041                 mmc_claim_host(host);
1042                 mmc_detach_bus(host);
1043                 mmc_power_off(host);
1044                 mmc_release_host(host);
1045         }
1046 }
1047
1048 /*
1049  * Suspend callback from host.
1050  */
1051 static int mmc_suspend(struct mmc_host *host)
1052 {
1053         int err = 0;
1054
1055         BUG_ON(!host);
1056         BUG_ON(!host->card);
1057
1058         mmc_claim_host(host);
1059         if (mmc_card_can_sleep(host))
1060                 err = mmc_card_sleep(host);
1061         else if (!mmc_host_is_spi(host))
1062                 mmc_deselect_cards(host);
1063         host->card->state &= ~MMC_STATE_HIGHSPEED;
1064         mmc_release_host(host);
1065
1066         return err;
1067 }
1068
1069 /*
1070  * Resume callback from host.
1071  *
1072  * This function tries to determine if the same card is still present
1073  * and, if so, restore all state to it.
1074  */
1075 static int mmc_resume(struct mmc_host *host)
1076 {
1077         int err;
1078
1079         BUG_ON(!host);
1080         BUG_ON(!host->card);
1081
1082         mmc_claim_host(host);
1083         err = mmc_init_card(host, host->ocr, host->card);
1084         mmc_release_host(host);
1085
1086         return err;
1087 }
1088
1089 static int mmc_power_restore(struct mmc_host *host)
1090 {
1091         int ret;
1092
1093         host->card->state &= ~MMC_STATE_HIGHSPEED;
1094         mmc_claim_host(host);
1095         ret = mmc_init_card(host, host->ocr, host->card);
1096         mmc_release_host(host);
1097
1098         return ret;
1099 }
1100
1101 static int mmc_sleep(struct mmc_host *host)
1102 {
1103         struct mmc_card *card = host->card;
1104         int err = -ENOSYS;
1105
1106         if (card && card->ext_csd.rev >= 3) {
1107                 err = mmc_card_sleepawake(host, 1);
1108                 if (err < 0)
1109                         pr_debug("%s: Error %d while putting card into sleep",
1110                                  mmc_hostname(host), err);
1111         }
1112
1113         return err;
1114 }
1115
1116 static int mmc_awake(struct mmc_host *host)
1117 {
1118         struct mmc_card *card = host->card;
1119         int err = -ENOSYS;
1120
1121         if (card && card->ext_csd.rev >= 3) {
1122                 err = mmc_card_sleepawake(host, 0);
1123                 if (err < 0)
1124                         pr_debug("%s: Error %d while awaking sleeping card",
1125                                  mmc_hostname(host), err);
1126         }
1127
1128         return err;
1129 }
1130
1131 static const struct mmc_bus_ops mmc_ops = {
1132         .awake = mmc_awake,
1133         .sleep = mmc_sleep,
1134         .remove = mmc_remove,
1135         .detect = mmc_detect,
1136         .suspend = NULL,
1137         .resume = NULL,
1138         .power_restore = mmc_power_restore,
1139 };
1140
1141 static const struct mmc_bus_ops mmc_ops_unsafe = {
1142         .awake = mmc_awake,
1143         .sleep = mmc_sleep,
1144         .remove = mmc_remove,
1145         .detect = mmc_detect,
1146         .suspend = mmc_suspend,
1147         .resume = mmc_resume,
1148         .power_restore = mmc_power_restore,
1149 };
1150
1151 static void mmc_attach_bus_ops(struct mmc_host *host)
1152 {
1153         const struct mmc_bus_ops *bus_ops;
1154
1155         if (!mmc_card_is_removable(host))
1156                 bus_ops = &mmc_ops_unsafe;
1157         else
1158                 bus_ops = &mmc_ops;
1159         mmc_attach_bus(host, bus_ops);
1160 }
1161
1162 /*
1163  * Starting point for MMC card init.
1164  */
1165 int mmc_attach_mmc(struct mmc_host *host)
1166 {
1167         int err;
1168         u32 ocr;
1169
1170         BUG_ON(!host);
1171         WARN_ON(!host->claimed);
1172
1173         /* Set correct bus mode for MMC before attempting attach */
1174         if (!mmc_host_is_spi(host))
1175                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1176
1177         err = mmc_send_op_cond(host, 0, &ocr);
1178         if (err)
1179                 return err;
1180
1181         mmc_attach_bus_ops(host);
1182         if (host->ocr_avail_mmc)
1183                 host->ocr_avail = host->ocr_avail_mmc;
1184
1185         /*
1186          * We need to get OCR a different way for SPI.
1187          */
1188         if (mmc_host_is_spi(host)) {
1189                 err = mmc_spi_read_ocr(host, 1, &ocr);
1190                 if (err)
1191                         goto err;
1192         }
1193
1194         /*
1195          * Sanity check the voltages that the card claims to
1196          * support.
1197          */
1198         if (ocr & 0x7F) {
1199                 printk(KERN_WARNING "%s: card claims to support voltages "
1200                        "below the defined range. These will be ignored.\n",
1201                        mmc_hostname(host));
1202                 ocr &= ~0x7F;
1203         }
1204
1205         host->ocr = mmc_select_voltage(host, ocr);
1206
1207         /*
1208          * Can we support the voltage of the card?
1209          */
1210         if (!host->ocr) {
1211                 err = -EINVAL;
1212                 goto err;
1213         }
1214
1215         /*
1216          * Detect and init the card.
1217          */
1218         err = mmc_init_card(host, host->ocr, NULL);
1219         if (err)
1220                 goto err;
1221
1222         mmc_release_host(host);
1223         err = mmc_add_card(host->card);
1224         mmc_claim_host(host);
1225         if (err)
1226                 goto remove_card;
1227
1228         return 0;
1229
1230 remove_card:
1231         mmc_release_host(host);
1232         mmc_remove_card(host->card);
1233         mmc_claim_host(host);
1234         host->card = NULL;
1235 err:
1236         mmc_detach_bus(host);
1237
1238         printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
1239                 mmc_hostname(host), err);
1240
1241         return err;
1242 }