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