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                 pr_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                 pr_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                 pr_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                         pr_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                         pr_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                         pr_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                 pr_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                 pr_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         /* eMMC v4.5 or later */
 456         if (card->ext_csd.rev >= 6)
 457                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 458
 459         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 460         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 461                 card->erased_byte = 0xFF;
 462         else
 463                 card->erased_byte = 0x0;
 464
 465         if (card->ext_csd.rev >= 6) {
 466                 card->ext_csd.generic_cmd6_time = 10 *
 467                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 468                 card->ext_csd.power_off_longtime = 10 *
 469                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 470         } else
 471                 card->ext_csd.generic_cmd6_time = 0;
 472
 473 out:
 474         return err;
 475 }
 476
 477 static inline void mmc_free_ext_csd(u8 *ext_csd)
 478 {
 479         kfree(ext_csd);
 480 }
 481
 482
 483 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 484 {
 485         u8 *bw_ext_csd;
 486         int err;
 487
 488         if (bus_width == MMC_BUS_WIDTH_1)
 489                 return 0;
 490
 491         err = mmc_get_ext_csd(card, &bw_ext_csd);
 492
 493         if (err || bw_ext_csd == NULL) {
 494                 if (bus_width != MMC_BUS_WIDTH_1)
 495                         err = -EINVAL;
 496                 goto out;
 497         }
 498
 499         if (bus_width == MMC_BUS_WIDTH_1)
 500                 goto out;
 501
 502         /* only compare read only fields */
 503         err = (!(card->ext_csd.raw_partition_support ==
 504                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 505                 (card->ext_csd.raw_erased_mem_count ==
 506                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 507                 (card->ext_csd.rev ==
 508                         bw_ext_csd[EXT_CSD_REV]) &&
 509                 (card->ext_csd.raw_ext_csd_structure ==
 510                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 511                 (card->ext_csd.raw_card_type ==
 512                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 513                 (card->ext_csd.raw_s_a_timeout ==
 514                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 515                 (card->ext_csd.raw_hc_erase_gap_size ==
 516                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 517                 (card->ext_csd.raw_erase_timeout_mult ==
 518                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 519                 (card->ext_csd.raw_hc_erase_grp_size ==
 520                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 521                 (card->ext_csd.raw_sec_trim_mult ==
 522                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 523                 (card->ext_csd.raw_sec_erase_mult ==
 524                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 525                 (card->ext_csd.raw_sec_feature_support ==
 526                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 527                 (card->ext_csd.raw_trim_mult ==
 528                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 529                 (card->ext_csd.raw_sectors[0] ==
 530                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 531                 (card->ext_csd.raw_sectors[1] ==
 532                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 533                 (card->ext_csd.raw_sectors[2] ==
 534                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 535                 (card->ext_csd.raw_sectors[3] ==
 536                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
 537         if (err)
 538                 err = -EINVAL;
 539
 540 out:
 541         mmc_free_ext_csd(bw_ext_csd);
 542         return err;
 543 }
 544
 545 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 546         card->raw_cid[2], card->raw_cid[3]);
 547 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 548         card->raw_csd[2], card->raw_csd[3]);
 549 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 550 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 551 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 552 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 553 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 554 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 555 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 556 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 557 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 558 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 559                 card->ext_csd.enhanced_area_offset);
 560 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 561
 562 static struct attribute *mmc_std_attrs[] = {
 563         &dev_attr_cid.attr,
 564         &dev_attr_csd.attr,
 565         &dev_attr_date.attr,
 566         &dev_attr_erase_size.attr,
 567         &dev_attr_preferred_erase_size.attr,
 568         &dev_attr_fwrev.attr,
 569         &dev_attr_hwrev.attr,
 570         &dev_attr_manfid.attr,
 571         &dev_attr_name.attr,
 572         &dev_attr_oemid.attr,
 573         &dev_attr_serial.attr,
 574         &dev_attr_enhanced_area_offset.attr,
 575         &dev_attr_enhanced_area_size.attr,
 576         NULL,
 577 };
 578
 579 static struct attribute_group mmc_std_attr_group = {
 580         .attrs = mmc_std_attrs,
 581 };
 582
 583 static const struct attribute_group *mmc_attr_groups[] = {
 584         &mmc_std_attr_group,
 585         NULL,
 586 };
 587
 588 static struct device_type mmc_type = {
 589         .groups = mmc_attr_groups,
 590 };
 591
 592 /*
 593  * Select the PowerClass for the current bus width
 594  * If power class is defined for 4/8 bit bus in the
 595  * extended CSD register, select it by executing the
 596  * mmc_switch command.
 597  */
 598 static int mmc_select_powerclass(struct mmc_card *card,
 599                 unsigned int bus_width, u8 *ext_csd)
 600 {
 601         int err = 0;
 602         unsigned int pwrclass_val;
 603         unsigned int index = 0;
 604         struct mmc_host *host;
 605
 606         BUG_ON(!card);
 607
 608         host = card->host;
 609         BUG_ON(!host);
 610
 611         if (ext_csd == NULL)
 612                 return 0;
 613
 614         /* Power class selection is supported for versions >= 4.0 */
 615         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 616                 return 0;
 617
 618         /* Power class values are defined only for 4/8 bit bus */
 619         if (bus_width == EXT_CSD_BUS_WIDTH_1)
 620                 return 0;
 621
 622         switch (1 << host->ios.vdd) {
 623         case MMC_VDD_165_195:
 624                 if (host->ios.clock <= 26000000)
 625                         index = EXT_CSD_PWR_CL_26_195;
 626                 else if (host->ios.clock <= 52000000)
 627                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 628                                 EXT_CSD_PWR_CL_52_195 :
 629                                 EXT_CSD_PWR_CL_DDR_52_195;
 630                 else if (host->ios.clock <= 200000000)
 631                         index = EXT_CSD_PWR_CL_200_195;
 632                 break;
 633         case MMC_VDD_32_33:
 634         case MMC_VDD_33_34:
 635         case MMC_VDD_34_35:
 636         case MMC_VDD_35_36:
 637                 if (host->ios.clock <= 26000000)
 638                         index = EXT_CSD_PWR_CL_26_360;
 639                 else if (host->ios.clock <= 52000000)
 640                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 641                                 EXT_CSD_PWR_CL_52_360 :
 642                                 EXT_CSD_PWR_CL_DDR_52_360;
 643                 else if (host->ios.clock <= 200000000)
 644                         index = EXT_CSD_PWR_CL_200_360;
 645                 break;
 646         default:
 647                 pr_warning("%s: Voltage range not supported "
 648                            "for power class.\n", mmc_hostname(host));
 649                 return -EINVAL;
 650         }
 651
 652         pwrclass_val = ext_csd[index];
 653
 654         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 655                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 656                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 657         else
 658                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 659                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 660
 661         /* If the power class is different from the default value */
 662         if (pwrclass_val > 0) {
 663                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 664                                  EXT_CSD_POWER_CLASS,
 665                                  pwrclass_val,
 666                                  0);
 667         }
 668
 669         return err;
 670 }
 671
 672 /*
 673  * Handle the detection and initialisation of a card.
 674  *
 675  * In the case of a resume, "oldcard" will contain the card
 676  * we're trying to reinitialise.
 677  */
 678 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 679         struct mmc_card *oldcard)
 680 {
 681         struct mmc_card *card;
 682         int err, ddr = 0;
 683         u32 cid[4];
 684         unsigned int max_dtr;
 685         u32 rocr;
 686         u8 *ext_csd = NULL;
 687
 688         BUG_ON(!host);
 689         WARN_ON(!host->claimed);
 690
 691         /* Set correct bus mode for MMC before attempting init */
 692         if (!mmc_host_is_spi(host))
 693                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 694
 695         /*
 696          * Since we're changing the OCR value, we seem to
 697          * need to tell some cards to go back to the idle
 698          * state.  We wait 1ms to give cards time to
 699          * respond.
 700          * mmc_go_idle is needed for eMMC that are asleep
 701          */
 702         mmc_go_idle(host);
 703
 704         /* The extra bit indicates that we support high capacity */
 705         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 706         if (err)
 707                 goto err;
 708
 709         /*
 710          * For SPI, enable CRC as appropriate.
 711          */
 712         if (mmc_host_is_spi(host)) {
 713                 err = mmc_spi_set_crc(host, use_spi_crc);
 714                 if (err)
 715                         goto err;
 716         }
 717
 718         /*
 719          * Fetch CID from card.
 720          */
 721         if (mmc_host_is_spi(host))
 722                 err = mmc_send_cid(host, cid);
 723         else
 724                 err = mmc_all_send_cid(host, cid);
 725         if (err)
 726                 goto err;
 727
 728         if (oldcard) {
 729                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 730                         err = -ENOENT;
 731                         goto err;
 732                 }
 733
 734                 card = oldcard;
 735         } else {
 736                 /*
 737                  * Allocate card structure.
 738                  */
 739                 card = mmc_alloc_card(host, &mmc_type);
 740                 if (IS_ERR(card)) {
 741                         err = PTR_ERR(card);
 742                         goto err;
 743                 }
 744
 745                 card->type = MMC_TYPE_MMC;
 746                 card->rca = 1;
 747                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 748         }
 749
 750         /*
 751          * For native busses:  set card RCA and quit open drain mode.
 752          */
 753         if (!mmc_host_is_spi(host)) {
 754                 err = mmc_set_relative_addr(card);
 755                 if (err)
 756                         goto free_card;
 757
 758                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 759         }
 760
 761         if (!oldcard) {
 762                 /*
 763                  * Fetch CSD from card.
 764                  */
 765                 err = mmc_send_csd(card, card->raw_csd);
 766                 if (err)
 767                         goto free_card;
 768
 769                 err = mmc_decode_csd(card);
 770                 if (err)
 771                         goto free_card;
 772                 err = mmc_decode_cid(card);
 773                 if (err)
 774                         goto free_card;
 775         }
 776
 777         /*
 778          * Select card, as all following commands rely on that.
 779          */
 780         if (!mmc_host_is_spi(host)) {
 781                 err = mmc_select_card(card);
 782                 if (err)
 783                         goto free_card;
 784         }
 785
 786         if (!oldcard) {
 787                 /*
 788                  * Fetch and process extended CSD.
 789                  */
 790
 791                 err = mmc_get_ext_csd(card, &ext_csd);
 792                 if (err)
 793                         goto free_card;
 794                 err = mmc_read_ext_csd(card, ext_csd);
 795                 if (err)
 796                         goto free_card;
 797
 798                 /* If doing byte addressing, check if required to do sector
 799                  * addressing.  Handle the case of <2GB cards needing sector
 800                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 801                  * ocr register has bit 30 set for sector addressing.
 802                  */
 803                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 804                         mmc_card_set_blockaddr(card);
 805
 806                 /* Erase size depends on CSD and Extended CSD */
 807                 mmc_set_erase_size(card);
 808         }
 809
 810         /*
 811          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 812          * bit.  This bit will be lost every time after a reset or power off.
 813          */
 814         if (card->ext_csd.enhanced_area_en) {
 815                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 816                                  EXT_CSD_ERASE_GROUP_DEF, 1,
 817                                  card->ext_csd.generic_cmd6_time);
 818
 819                 if (err && err != -EBADMSG)
 820                         goto free_card;
 821
 822                 if (err) {
 823                         err = 0;
 824                         /*
 825                          * Just disable enhanced area off & sz
 826                          * will try to enable ERASE_GROUP_DEF
 827                          * during next time reinit
 828                          */
 829                         card->ext_csd.enhanced_area_offset = -EINVAL;
 830                         card->ext_csd.enhanced_area_size = -EINVAL;
 831                 } else {
 832                         card->ext_csd.erase_group_def = 1;
 833                         /*
 834                          * enable ERASE_GRP_DEF successfully.
 835                          * This will affect the erase size, so
 836                          * here need to reset erase size
 837                          */
 838                         mmc_set_erase_size(card);
 839                 }
 840         }
 841
 842         /*
 843          * Ensure eMMC user default partition is enabled
 844          */
 845         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
 846                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 847                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
 848                                  card->ext_csd.part_config,
 849                                  card->ext_csd.part_time);
 850                 if (err && err != -EBADMSG)
 851                         goto free_card;
 852         }
 853
 854         /*
 855          * If the host supports the power_off_notify capability then
 856          * set the notification byte in the ext_csd register of device
 857          */
 858         if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
 859             (card->poweroff_notify_state == MMC_NO_POWER_NOTIFICATION)) {
 860                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 861                                  EXT_CSD_POWER_OFF_NOTIFICATION,
 862                                  EXT_CSD_POWER_ON,
 863                                  card->ext_csd.generic_cmd6_time);
 864                 if (err && err != -EBADMSG)
 865                         goto free_card;
 866         }
 867
 868         if (!err)
 869                 card->poweroff_notify_state = MMC_POWERED_ON;
 870
 871         /*
 872          * Activate high speed (if supported)
 873          */
 874         if ((card->ext_csd.hs_max_dtr != 0) &&
 875                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
 876                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 877                                  EXT_CSD_HS_TIMING, 1,
 878                                  card->ext_csd.generic_cmd6_time);
 879                 if (err && err != -EBADMSG)
 880                         goto free_card;
 881
 882                 if (err) {
 883                         pr_warning("%s: switch to highspeed failed\n",
 884                                mmc_hostname(card->host));
 885                         err = 0;
 886                 } else {
 887                         mmc_card_set_highspeed(card);
 888                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
 889                 }
 890         }
 891
 892         /*
 893          * Compute bus speed.
 894          */
 895         max_dtr = (unsigned int)-1;
 896
 897         if (mmc_card_highspeed(card)) {
 898                 if (max_dtr > card->ext_csd.hs_max_dtr)
 899                         max_dtr = card->ext_csd.hs_max_dtr;
 900         } else if (max_dtr > card->csd.max_dtr) {
 901                 max_dtr = card->csd.max_dtr;
 902         }
 903
 904         mmc_set_clock(host, max_dtr);
 905
 906         /*
 907          * Indicate DDR mode (if supported).
 908          */
 909         if (mmc_card_highspeed(card)) {
 910                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
 911                         && ((host->caps & (MMC_CAP_1_8V_DDR |
 912                              MMC_CAP_UHS_DDR50))
 913                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
 914                                 ddr = MMC_1_8V_DDR_MODE;
 915                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
 916                         && ((host->caps & (MMC_CAP_1_2V_DDR |
 917                              MMC_CAP_UHS_DDR50))
 918                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
 919                                 ddr = MMC_1_2V_DDR_MODE;
 920         }
 921
 922         /*
 923          * Activate wide bus and DDR (if supported).
 924          */
 925         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
 926             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
 927                 static unsigned ext_csd_bits[][2] = {
 928                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
 929                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
 930                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
 931                 };
 932                 static unsigned bus_widths[] = {
 933                         MMC_BUS_WIDTH_8,
 934                         MMC_BUS_WIDTH_4,
 935                         MMC_BUS_WIDTH_1
 936                 };
 937                 unsigned idx, bus_width = 0;
 938
 939                 if (host->caps & MMC_CAP_8_BIT_DATA)
 940                         idx = 0;
 941                 else
 942                         idx = 1;
 943                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 944                         bus_width = bus_widths[idx];
 945                         if (bus_width == MMC_BUS_WIDTH_1)
 946                                 ddr = 0; /* no DDR for 1-bit width */
 947                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
 948                                                     ext_csd);
 949                         if (err)
 950                                 pr_err("%s: power class selection to "
 951                                        "bus width %d failed\n",
 952                                        mmc_hostname(card->host),
 953                                        1 << bus_width);
 954
 955                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 956                                          EXT_CSD_BUS_WIDTH,
 957                                          ext_csd_bits[idx][0],
 958                                          card->ext_csd.generic_cmd6_time);
 959                         if (!err) {
 960                                 mmc_set_bus_width(card->host, bus_width);
 961
 962                                 /*
 963                                  * If controller can't handle bus width test,
 964                                  * compare ext_csd previously read in 1 bit mode
 965                                  * against ext_csd at new bus width
 966                                  */
 967                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 968                                         err = mmc_compare_ext_csds(card,
 969                                                 bus_width);
 970                                 else
 971                                         err = mmc_bus_test(card, bus_width);
 972                                 if (!err)
 973                                         break;
 974                         }
 975                 }
 976
 977                 if (!err && ddr) {
 978                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
 979                                                     ext_csd);
 980                         if (err)
 981                                 pr_err("%s: power class selection to "
 982                                        "bus width %d ddr %d failed\n",
 983                                        mmc_hostname(card->host),
 984                                        1 << bus_width, ddr);
 985
 986                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 987                                          EXT_CSD_BUS_WIDTH,
 988                                          ext_csd_bits[idx][1],
 989                                          card->ext_csd.generic_cmd6_time);
 990                 }
 991                 if (err) {
 992                         pr_warning("%s: switch to bus width %d ddr %d "
 993                                 "failed\n", mmc_hostname(card->host),
 994                                 1 << bus_width, ddr);
 995                         goto free_card;
 996                 } else if (ddr) {
 997                         /*
 998                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
 999                          * signaling.
1000                          *
1001                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1002                          *
1003                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1004                          * in the JEDEC spec for DDR.
1005                          *
1006                          * Do not force change in vccq since we are obviously
1007                          * working and no change to vccq is needed.
1008                          *
1009                          * WARNING: eMMC rules are NOT the same as SD DDR
1010                          */
1011                         if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
1012                                 err = mmc_set_signal_voltage(host,
1013                                         MMC_SIGNAL_VOLTAGE_120, 0);
1014                                 if (err)
1015                                         goto err;
1016                         }
1017                         mmc_card_set_ddr_mode(card);
1018                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1019                         mmc_set_bus_width(card->host, bus_width);
1020                 }
1021         }
1022
1023         if (!oldcard)
1024                 host->card = card;
1025
1026         mmc_free_ext_csd(ext_csd);
1027         return 0;
1028
1029 free_card:
1030         if (!oldcard)
1031                 mmc_remove_card(card);
1032 err:
1033         mmc_free_ext_csd(ext_csd);
1034
1035         return err;
1036 }
1037
1038 /*
1039  * Host is being removed. Free up the current card.
1040  */
1041 static void mmc_remove(struct mmc_host *host)
1042 {
1043         BUG_ON(!host);
1044         BUG_ON(!host->card);
1045
1046         mmc_remove_card(host->card);
1047         host->card = NULL;
1048 }
1049
1050 /*
1051  * Card detection callback from host.
1052  */
1053 static void mmc_detect(struct mmc_host *host)
1054 {
1055         int err;
1056
1057         BUG_ON(!host);
1058         BUG_ON(!host->card);
1059
1060         mmc_claim_host(host);
1061
1062         /*
1063          * Just check if our card has been removed.
1064          */
1065         err = mmc_send_status(host->card, NULL);
1066
1067         mmc_release_host(host);
1068
1069         if (err) {
1070                 mmc_remove(host);
1071
1072                 mmc_claim_host(host);
1073                 mmc_detach_bus(host);
1074                 mmc_power_off(host);
1075                 mmc_release_host(host);
1076         }
1077 }
1078
1079 /*
1080  * Suspend callback from host.
1081  */
1082 static int mmc_suspend(struct mmc_host *host)
1083 {
1084         int err = 0;
1085
1086         BUG_ON(!host);
1087         BUG_ON(!host->card);
1088
1089         mmc_claim_host(host);
1090         if (mmc_card_can_sleep(host))
1091                 err = mmc_card_sleep(host);
1092         else if (!mmc_host_is_spi(host))
1093                 mmc_deselect_cards(host);
1094         host->card->state &= ~MMC_STATE_HIGHSPEED;
1095         mmc_release_host(host);
1096
1097         return err;
1098 }
1099
1100 /*
1101  * Resume callback from host.
1102  *
1103  * This function tries to determine if the same card is still present
1104  * and, if so, restore all state to it.
1105  */
1106 static int mmc_resume(struct mmc_host *host)
1107 {
1108         int err;
1109
1110         BUG_ON(!host);
1111         BUG_ON(!host->card);
1112
1113         mmc_claim_host(host);
1114         err = mmc_init_card(host, host->ocr, host->card);
1115         mmc_release_host(host);
1116
1117         return err;
1118 }
1119
1120 static int mmc_power_restore(struct mmc_host *host)
1121 {
1122         int ret;
1123
1124         host->card->state &= ~MMC_STATE_HIGHSPEED;
1125         mmc_claim_host(host);
1126         ret = mmc_init_card(host, host->ocr, host->card);
1127         mmc_release_host(host);
1128
1129         return ret;
1130 }
1131
1132 static int mmc_sleep(struct mmc_host *host)
1133 {
1134         struct mmc_card *card = host->card;
1135         int err = -ENOSYS;
1136
1137         if (card && card->ext_csd.rev >= 3) {
1138                 err = mmc_card_sleepawake(host, 1);
1139                 if (err < 0)
1140                         pr_debug("%s: Error %d while putting card into sleep",
1141                                  mmc_hostname(host), err);
1142         }
1143
1144         return err;
1145 }
1146
1147 static int mmc_awake(struct mmc_host *host)
1148 {
1149         struct mmc_card *card = host->card;
1150         int err = -ENOSYS;
1151
1152         if (card && card->ext_csd.rev >= 3) {
1153                 err = mmc_card_sleepawake(host, 0);
1154                 if (err < 0)
1155                         pr_debug("%s: Error %d while awaking sleeping card",
1156                                  mmc_hostname(host), err);
1157         }
1158
1159         return err;
1160 }
1161
1162 static const struct mmc_bus_ops mmc_ops = {
1163         .awake = mmc_awake,
1164         .sleep = mmc_sleep,
1165         .remove = mmc_remove,
1166         .detect = mmc_detect,
1167         .suspend = NULL,
1168         .resume = NULL,
1169         .power_restore = mmc_power_restore,
1170 };
1171
1172 static const struct mmc_bus_ops mmc_ops_unsafe = {
1173         .awake = mmc_awake,
1174         .sleep = mmc_sleep,
1175         .remove = mmc_remove,
1176         .detect = mmc_detect,
1177         .suspend = mmc_suspend,
1178         .resume = mmc_resume,
1179         .power_restore = mmc_power_restore,
1180 };
1181
1182 static void mmc_attach_bus_ops(struct mmc_host *host)
1183 {
1184         const struct mmc_bus_ops *bus_ops;
1185
1186         if (!mmc_card_is_removable(host))
1187                 bus_ops = &mmc_ops_unsafe;
1188         else
1189                 bus_ops = &mmc_ops;
1190         mmc_attach_bus(host, bus_ops);
1191 }
1192
1193 /*
1194  * Starting point for MMC card init.
1195  */
1196 int mmc_attach_mmc(struct mmc_host *host)
1197 {
1198         int err;
1199         u32 ocr;
1200
1201         BUG_ON(!host);
1202         WARN_ON(!host->claimed);
1203
1204         /* Set correct bus mode for MMC before attempting attach */
1205         if (!mmc_host_is_spi(host))
1206                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1207
1208         err = mmc_send_op_cond(host, 0, &ocr);
1209         if (err)
1210                 return err;
1211
1212         mmc_attach_bus_ops(host);
1213         if (host->ocr_avail_mmc)
1214                 host->ocr_avail = host->ocr_avail_mmc;
1215
1216         /*
1217          * We need to get OCR a different way for SPI.
1218          */
1219         if (mmc_host_is_spi(host)) {
1220                 err = mmc_spi_read_ocr(host, 1, &ocr);
1221                 if (err)
1222                         goto err;
1223         }
1224
1225         /*
1226          * Sanity check the voltages that the card claims to
1227          * support.
1228          */
1229         if (ocr & 0x7F) {
1230                 pr_warning("%s: card claims to support voltages "
1231                        "below the defined range. These will be ignored.\n",
1232                        mmc_hostname(host));
1233                 ocr &= ~0x7F;
1234         }
1235
1236         host->ocr = mmc_select_voltage(host, ocr);
1237
1238         /*
1239          * Can we support the voltage of the card?
1240          */
1241         if (!host->ocr) {
1242                 err = -EINVAL;
1243                 goto err;
1244         }
1245
1246         /*
1247          * Detect and init the card.
1248          */
1249         err = mmc_init_card(host, host->ocr, NULL);
1250         if (err)
1251                 goto err;
1252
1253         mmc_release_host(host);
1254         err = mmc_add_card(host->card);
1255         mmc_claim_host(host);
1256         if (err)
1257                 goto remove_card;
1258
1259         return 0;
1260
1261 remove_card:
1262         mmc_release_host(host);
1263         mmc_remove_card(host->card);
1264         mmc_claim_host(host);
1265         host->card = NULL;
1266 err:
1267         mmc_detach_bus(host);
1268
1269         pr_err("%s: error %d whilst initialising MMC card\n",
1270                 mmc_hostname(host), err);
1271
1272         return err;
1273 }