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 #include <linux/stat.h>
  16
  17 #include <linux/mmc/host.h>
  18 #include <linux/mmc/card.h>
  19 #include <linux/mmc/mmc.h>
  20
  21 #include "core.h"
  22 #include "bus.h"
  23 #include "mmc_ops.h"
  24 #include "sd_ops.h"
  25
  26 static const unsigned int tran_exp[] = {
  27         10000,          100000,         1000000,        10000000,
  28         0,              0,              0,              0
  29 };
  30
  31 static const unsigned char tran_mant[] = {
  32         0,      10,     12,     13,     15,     20,     25,     30,
  33         35,     40,     45,     50,     55,     60,     70,     80,
  34 };
  35
  36 static const unsigned int tacc_exp[] = {
  37         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  38 };
  39
  40 static const unsigned int tacc_mant[] = {
  41         0,      10,     12,     13,     15,     20,     25,     30,
  42         35,     40,     45,     50,     55,     60,     70,     80,
  43 };
  44
  45 #define UNSTUFF_BITS(resp,start,size)                                   \
  46         ({                                                              \
  47                 const int __size = size;                                \
  48                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  49                 const int __off = 3 - ((start) / 32);                   \
  50                 const int __shft = (start) & 31;                        \
  51                 u32 __res;                                              \
  52                                                                         \
  53                 __res = resp[__off] >> __shft;                          \
  54                 if (__size + __shft > 32)                               \
  55                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  56                 __res & __mask;                                         \
  57         })
  58
  59 /*
  60  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  61  */
  62 static int mmc_decode_cid(struct mmc_card *card)
  63 {
  64         u32 *resp = card->raw_cid;
  65
  66         /*
  67          * The selection of the format here is based upon published
  68          * specs from sandisk and from what people have reported.
  69          */
  70         switch (card->csd.mmca_vsn) {
  71         case 0: /* MMC v1.0 - v1.2 */
  72         case 1: /* MMC v1.4 */
  73                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  74                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  75                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  76                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  77                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  78                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  79                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  80                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  81                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  82                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  83                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  84                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  85                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  86                 break;
  87
  88         case 2: /* MMC v2.0 - v2.2 */
  89         case 3: /* MMC v3.1 - v3.3 */
  90         case 4: /* MMC v4 */
  91                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
  92                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
  93                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  94                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  95                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  96                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  97                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  98                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  99                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 100                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 101                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 102                 break;
 103
 104         default:
 105                 pr_err("%s: card has unknown MMCA version %d\n",
 106                         mmc_hostname(card->host), card->csd.mmca_vsn);
 107                 return -EINVAL;
 108         }
 109
 110         return 0;
 111 }
 112
 113 static void mmc_set_erase_size(struct mmc_card *card)
 114 {
 115         if (card->ext_csd.erase_group_def & 1)
 116                 card->erase_size = card->ext_csd.hc_erase_size;
 117         else
 118                 card->erase_size = card->csd.erase_size;
 119
 120         mmc_init_erase(card);
 121 }
 122
 123 /*
 124  * Given a 128-bit response, decode to our card CSD structure.
 125  */
 126 static int mmc_decode_csd(struct mmc_card *card)
 127 {
 128         struct mmc_csd *csd = &card->csd;
 129         unsigned int e, m, a, b;
 130         u32 *resp = card->raw_csd;
 131
 132         /*
 133          * We only understand CSD structure v1.1 and v1.2.
 134          * v1.2 has extra information in bits 15, 11 and 10.
 135          * We also support eMMC v4.4 & v4.41.
 136          */
 137         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 138         if (csd->structure == 0) {
 139                 pr_err("%s: unrecognised CSD structure version %d\n",
 140                         mmc_hostname(card->host), csd->structure);
 141                 return -EINVAL;
 142         }
 143
 144         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 145         m = UNSTUFF_BITS(resp, 115, 4);
 146         e = UNSTUFF_BITS(resp, 112, 3);
 147         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 148         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 149
 150         m = UNSTUFF_BITS(resp, 99, 4);
 151         e = UNSTUFF_BITS(resp, 96, 3);
 152         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 153         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 154
 155         e = UNSTUFF_BITS(resp, 47, 3);
 156         m = UNSTUFF_BITS(resp, 62, 12);
 157         csd->capacity     = (1 + m) << (e + 2);
 158
 159         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 160         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 161         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 162         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 163         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 164         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 165         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 166
 167         if (csd->write_blkbits >= 9) {
 168                 a = UNSTUFF_BITS(resp, 42, 5);
 169                 b = UNSTUFF_BITS(resp, 37, 5);
 170                 csd->erase_size = (a + 1) * (b + 1);
 171                 csd->erase_size <<= csd->write_blkbits - 9;
 172         }
 173
 174         return 0;
 175 }
 176
 177 /*
 178  * Read extended CSD.
 179  */
 180 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
 181 {
 182         int err;
 183         u8 *ext_csd;
 184
 185         BUG_ON(!card);
 186         BUG_ON(!new_ext_csd);
 187
 188         *new_ext_csd = NULL;
 189
 190         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 191                 return 0;
 192
 193         /*
 194          * As the ext_csd is so large and mostly unused, we don't store the
 195          * raw block in mmc_card.
 196          */
 197         ext_csd = kmalloc(512, GFP_KERNEL);
 198         if (!ext_csd) {
 199                 pr_err("%s: could not allocate a buffer to "
 200                         "receive the ext_csd.\n", mmc_hostname(card->host));
 201                 return -ENOMEM;
 202         }
 203
 204         err = mmc_send_ext_csd(card, ext_csd);
 205         if (err) {
 206                 kfree(ext_csd);
 207                 *new_ext_csd = NULL;
 208
 209                 /* If the host or the card can't do the switch,
 210                  * fail more gracefully. */
 211                 if ((err != -EINVAL)
 212                  && (err != -ENOSYS)
 213                  && (err != -EFAULT))
 214                         return err;
 215
 216                 /*
 217                  * High capacity cards should have this "magic" size
 218                  * stored in their CSD.
 219                  */
 220                 if (card->csd.capacity == (4096 * 512)) {
 221                         pr_err("%s: unable to read EXT_CSD "
 222                                 "on a possible high capacity card. "
 223                                 "Card will be ignored.\n",
 224                                 mmc_hostname(card->host));
 225                 } else {
 226                         pr_warning("%s: unable to read "
 227                                 "EXT_CSD, performance might "
 228                                 "suffer.\n",
 229                                 mmc_hostname(card->host));
 230                         err = 0;
 231                 }
 232         } else
 233                 *new_ext_csd = ext_csd;
 234
 235         return err;
 236 }
 237
 238 /* Minimum partition switch timeout in milliseconds */
 239 #define MMC_MIN_PART_SWITCH_TIME        300
 240
 241 /*
 242  * Decode extended CSD.
 243  */
 244 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 245 {
 246         int err = 0, idx;
 247         unsigned int part_size;
 248         u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
 249
 250         BUG_ON(!card);
 251
 252         if (!ext_csd)
 253                 return 0;
 254
 255         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 256         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 257         if (card->csd.structure == 3) {
 258                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 259                         pr_err("%s: unrecognised EXT_CSD structure "
 260                                 "version %d\n", mmc_hostname(card->host),
 261                                         card->ext_csd.raw_ext_csd_structure);
 262                         err = -EINVAL;
 263                         goto out;
 264                 }
 265         }
 266
 267         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 268         if (card->ext_csd.rev > 6) {
 269                 pr_err("%s: unrecognised EXT_CSD revision %d\n",
 270                         mmc_hostname(card->host), card->ext_csd.rev);
 271                 err = -EINVAL;
 272                 goto out;
 273         }
 274
 275         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 276         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 277         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 278         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 279         if (card->ext_csd.rev >= 2) {
 280                 card->ext_csd.sectors =
 281                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 282                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 283                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 284                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 285
 286                 /* Cards with density > 2GiB are sector addressed */
 287                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 288                         mmc_card_set_blockaddr(card);
 289         }
 290         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 291         switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
 292         case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
 293              EXT_CSD_CARD_TYPE_26:
 294                 card->ext_csd.hs_max_dtr = 52000000;
 295                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
 296                 break;
 297         case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
 298              EXT_CSD_CARD_TYPE_26:
 299                 card->ext_csd.hs_max_dtr = 52000000;
 300                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
 301                 break;
 302         case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
 303              EXT_CSD_CARD_TYPE_26:
 304                 card->ext_csd.hs_max_dtr = 52000000;
 305                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
 306                 break;
 307         case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
 308                 card->ext_csd.hs_max_dtr = 52000000;
 309                 break;
 310         case EXT_CSD_CARD_TYPE_26:
 311                 card->ext_csd.hs_max_dtr = 26000000;
 312                 break;
 313         default:
 314                 /* MMC v4 spec says this cannot happen */
 315                 pr_warning("%s: card is mmc v4 but doesn't "
 316                         "support any high-speed modes.\n",
 317                         mmc_hostname(card->host));
 318         }
 319
 320         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 321         card->ext_csd.raw_erase_timeout_mult =
 322                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 323         card->ext_csd.raw_hc_erase_grp_size =
 324                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 325         if (card->ext_csd.rev >= 3) {
 326                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 327                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 328
 329                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 330                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 331                 /* Some eMMC set the value too low so set a minimum */
 332                 if (card->ext_csd.part_time &&
 333                     card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
 334                         card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
 335
 336                 /* Sleep / awake timeout in 100ns units */
 337                 if (sa_shift > 0 && sa_shift <= 0x17)
 338                         card->ext_csd.sa_timeout =
 339                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 340                 card->ext_csd.erase_group_def =
 341                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 342                 card->ext_csd.hc_erase_timeout = 300 *
 343                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 344                 card->ext_csd.hc_erase_size =
 345                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 346
 347                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 348
 349                 /*
 350                  * There are two boot regions of equal size, defined in
 351                  * multiples of 128K.
 352                  */
 353                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 354                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 355                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 356                                 mmc_part_add(card, part_size,
 357                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 358                                         "boot%d", idx, true);
 359                         }
 360                 }
 361         }
 362
 363         card->ext_csd.raw_hc_erase_gap_size =
 364                 ext_csd[EXT_CSD_PARTITION_ATTRIBUTE];
 365         card->ext_csd.raw_sec_trim_mult =
 366                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 367         card->ext_csd.raw_sec_erase_mult =
 368                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 369         card->ext_csd.raw_sec_feature_support =
 370                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 371         card->ext_csd.raw_trim_mult =
 372                 ext_csd[EXT_CSD_TRIM_MULT];
 373         card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 374         if (card->ext_csd.rev >= 4) {
 375                 /*
 376                  * Enhanced area feature support -- check whether the eMMC
 377                  * card has the Enhanced area enabled.  If so, export enhanced
 378                  * area offset and size to user by adding sysfs interface.
 379                  */
 380                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 381                     (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 382                         hc_erase_grp_sz =
 383                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 384                         hc_wp_grp_sz =
 385                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 386
 387                         card->ext_csd.enhanced_area_en = 1;
 388                         /*
 389                          * calculate the enhanced data area offset, in bytes
 390                          */
 391                         card->ext_csd.enhanced_area_offset =
 392                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
 393                                 (ext_csd[137] << 8) + ext_csd[136];
 394                         if (mmc_card_blockaddr(card))
 395                                 card->ext_csd.enhanced_area_offset <<= 9;
 396                         /*
 397                          * calculate the enhanced data area size, in kilobytes
 398                          */
 399                         card->ext_csd.enhanced_area_size =
 400                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 401                                 ext_csd[140];
 402                         card->ext_csd.enhanced_area_size *=
 403                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 404                         card->ext_csd.enhanced_area_size <<= 9;
 405                 } else {
 406                         /*
 407                          * If the enhanced area is not enabled, disable these
 408                          * device attributes.
 409                          */
 410                         card->ext_csd.enhanced_area_offset = -EINVAL;
 411                         card->ext_csd.enhanced_area_size = -EINVAL;
 412                 }
 413
 414                 /*
 415                  * General purpose partition feature support --
 416                  * If ext_csd has the size of general purpose partitions,
 417                  * set size, part_cfg, partition name in mmc_part.
 418                  */
 419                 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 420                         EXT_CSD_PART_SUPPORT_PART_EN) {
 421                         if (card->ext_csd.enhanced_area_en != 1) {
 422                                 hc_erase_grp_sz =
 423                                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 424                                 hc_wp_grp_sz =
 425                                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 426
 427                                 card->ext_csd.enhanced_area_en = 1;
 428                         }
 429
 430                         for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 431                                 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 432                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 433                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 434                                         continue;
 435                                 part_size =
 436                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 437                                         << 16) +
 438                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 439                                         << 8) +
 440                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 441                                 part_size *= (size_t)(hc_erase_grp_sz *
 442                                         hc_wp_grp_sz);
 443                                 mmc_part_add(card, part_size << 19,
 444                                         EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 445                                         "gp%d", idx, false);
 446                         }
 447                 }
 448                 card->ext_csd.sec_trim_mult =
 449                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 450                 card->ext_csd.sec_erase_mult =
 451                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 452                 card->ext_csd.sec_feature_support =
 453                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 454                 card->ext_csd.trim_timeout = 300 *
 455                         ext_csd[EXT_CSD_TRIM_MULT];
 456         }
 457
 458         if (card->ext_csd.rev >= 5) {
 459                 /* check whether the eMMC card supports HPI */
 460                 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
 461                         card->ext_csd.hpi = 1;
 462                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 463                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 464                         else
 465                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 466                         /*
 467                          * Indicate the maximum timeout to close
 468                          * a command interrupted by HPI
 469                          */
 470                         card->ext_csd.out_of_int_time =
 471                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 472                 }
 473
 474                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 475                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 476         }
 477
 478         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 479         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 480                 card->erased_byte = 0xFF;
 481         else
 482                 card->erased_byte = 0x0;
 483
 484         /* eMMC v4.5 or later */
 485         if (card->ext_csd.rev >= 6) {
 486                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 487
 488                 card->ext_csd.generic_cmd6_time = 10 *
 489                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 490                 card->ext_csd.power_off_longtime = 10 *
 491                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 492
 493                 card->ext_csd.cache_size =
 494                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 495                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 496                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 497                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 498         }
 499
 500 out:
 501         return err;
 502 }
 503
 504 static inline void mmc_free_ext_csd(u8 *ext_csd)
 505 {
 506         kfree(ext_csd);
 507 }
 508
 509
 510 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 511 {
 512         u8 *bw_ext_csd;
 513         int err;
 514
 515         if (bus_width == MMC_BUS_WIDTH_1)
 516                 return 0;
 517
 518         err = mmc_get_ext_csd(card, &bw_ext_csd);
 519
 520         if (err || bw_ext_csd == NULL) {
 521                 if (bus_width != MMC_BUS_WIDTH_1)
 522                         err = -EINVAL;
 523                 goto out;
 524         }
 525
 526         if (bus_width == MMC_BUS_WIDTH_1)
 527                 goto out;
 528
 529         /* only compare read only fields */
 530         err = (!(card->ext_csd.raw_partition_support ==
 531                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 532                 (card->ext_csd.raw_erased_mem_count ==
 533                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 534                 (card->ext_csd.rev ==
 535                         bw_ext_csd[EXT_CSD_REV]) &&
 536                 (card->ext_csd.raw_ext_csd_structure ==
 537                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 538                 (card->ext_csd.raw_card_type ==
 539                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 540                 (card->ext_csd.raw_s_a_timeout ==
 541                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 542                 (card->ext_csd.raw_hc_erase_gap_size ==
 543                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 544                 (card->ext_csd.raw_erase_timeout_mult ==
 545                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 546                 (card->ext_csd.raw_hc_erase_grp_size ==
 547                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 548                 (card->ext_csd.raw_sec_trim_mult ==
 549                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 550                 (card->ext_csd.raw_sec_erase_mult ==
 551                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 552                 (card->ext_csd.raw_sec_feature_support ==
 553                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 554                 (card->ext_csd.raw_trim_mult ==
 555                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 556                 (card->ext_csd.raw_sectors[0] ==
 557                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 558                 (card->ext_csd.raw_sectors[1] ==
 559                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 560                 (card->ext_csd.raw_sectors[2] ==
 561                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 562                 (card->ext_csd.raw_sectors[3] ==
 563                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
 564         if (err)
 565                 err = -EINVAL;
 566
 567 out:
 568         mmc_free_ext_csd(bw_ext_csd);
 569         return err;
 570 }
 571
 572 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 573         card->raw_cid[2], card->raw_cid[3]);
 574 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 575         card->raw_csd[2], card->raw_csd[3]);
 576 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 577 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 578 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 579 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 580 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 581 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 582 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 583 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 584 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 585 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 586                 card->ext_csd.enhanced_area_offset);
 587 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 588
 589 static struct attribute *mmc_std_attrs[] = {
 590         &dev_attr_cid.attr,
 591         &dev_attr_csd.attr,
 592         &dev_attr_date.attr,
 593         &dev_attr_erase_size.attr,
 594         &dev_attr_preferred_erase_size.attr,
 595         &dev_attr_fwrev.attr,
 596         &dev_attr_hwrev.attr,
 597         &dev_attr_manfid.attr,
 598         &dev_attr_name.attr,
 599         &dev_attr_oemid.attr,
 600         &dev_attr_serial.attr,
 601         &dev_attr_enhanced_area_offset.attr,
 602         &dev_attr_enhanced_area_size.attr,
 603         NULL,
 604 };
 605
 606 static struct attribute_group mmc_std_attr_group = {
 607         .attrs = mmc_std_attrs,
 608 };
 609
 610 static const struct attribute_group *mmc_attr_groups[] = {
 611         &mmc_std_attr_group,
 612         NULL,
 613 };
 614
 615 static struct device_type mmc_type = {
 616         .groups = mmc_attr_groups,
 617 };
 618
 619 /*
 620  * Select the PowerClass for the current bus width
 621  * If power class is defined for 4/8 bit bus in the
 622  * extended CSD register, select it by executing the
 623  * mmc_switch command.
 624  */
 625 static int mmc_select_powerclass(struct mmc_card *card,
 626                 unsigned int bus_width, u8 *ext_csd)
 627 {
 628         int err = 0;
 629         unsigned int pwrclass_val;
 630         unsigned int index = 0;
 631         struct mmc_host *host;
 632
 633         BUG_ON(!card);
 634
 635         host = card->host;
 636         BUG_ON(!host);
 637
 638         if (ext_csd == NULL)
 639                 return 0;
 640
 641         /* Power class selection is supported for versions >= 4.0 */
 642         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 643                 return 0;
 644
 645         /* Power class values are defined only for 4/8 bit bus */
 646         if (bus_width == EXT_CSD_BUS_WIDTH_1)
 647                 return 0;
 648
 649         switch (1 << host->ios.vdd) {
 650         case MMC_VDD_165_195:
 651                 if (host->ios.clock <= 26000000)
 652                         index = EXT_CSD_PWR_CL_26_195;
 653                 else if (host->ios.clock <= 52000000)
 654                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 655                                 EXT_CSD_PWR_CL_52_195 :
 656                                 EXT_CSD_PWR_CL_DDR_52_195;
 657                 else if (host->ios.clock <= 200000000)
 658                         index = EXT_CSD_PWR_CL_200_195;
 659                 break;
 660         case MMC_VDD_32_33:
 661         case MMC_VDD_33_34:
 662         case MMC_VDD_34_35:
 663         case MMC_VDD_35_36:
 664                 if (host->ios.clock <= 26000000)
 665                         index = EXT_CSD_PWR_CL_26_360;
 666                 else if (host->ios.clock <= 52000000)
 667                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 668                                 EXT_CSD_PWR_CL_52_360 :
 669                                 EXT_CSD_PWR_CL_DDR_52_360;
 670                 else if (host->ios.clock <= 200000000)
 671                         index = EXT_CSD_PWR_CL_200_360;
 672                 break;
 673         default:
 674                 pr_warning("%s: Voltage range not supported "
 675                            "for power class.\n", mmc_hostname(host));
 676                 return -EINVAL;
 677         }
 678
 679         pwrclass_val = ext_csd[index];
 680
 681         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 682                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 683                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 684         else
 685                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 686                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 687
 688         /* If the power class is different from the default value */
 689         if (pwrclass_val > 0) {
 690                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 691                                  EXT_CSD_POWER_CLASS,
 692                                  pwrclass_val,
 693                                  card->ext_csd.generic_cmd6_time);
 694         }
 695
 696         return err;
 697 }
 698
 699 /*
 700  * Handle the detection and initialisation of a card.
 701  *
 702  * In the case of a resume, "oldcard" will contain the card
 703  * we're trying to reinitialise.
 704  */
 705 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 706         struct mmc_card *oldcard)
 707 {
 708         struct mmc_card *card;
 709         int err, ddr = 0;
 710         u32 cid[4];
 711         unsigned int max_dtr;
 712         u32 rocr;
 713         u8 *ext_csd = NULL;
 714
 715         BUG_ON(!host);
 716         WARN_ON(!host->claimed);
 717
 718         /* Set correct bus mode for MMC before attempting init */
 719         if (!mmc_host_is_spi(host))
 720                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 721
 722         /*
 723          * Since we're changing the OCR value, we seem to
 724          * need to tell some cards to go back to the idle
 725          * state.  We wait 1ms to give cards time to
 726          * respond.
 727          * mmc_go_idle is needed for eMMC that are asleep
 728          */
 729         mmc_go_idle(host);
 730
 731         /* The extra bit indicates that we support high capacity */
 732         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 733         if (err)
 734                 goto err;
 735
 736         /*
 737          * For SPI, enable CRC as appropriate.
 738          */
 739         if (mmc_host_is_spi(host)) {
 740                 err = mmc_spi_set_crc(host, use_spi_crc);
 741                 if (err)
 742                         goto err;
 743         }
 744
 745         /*
 746          * Fetch CID from card.
 747          */
 748         if (mmc_host_is_spi(host))
 749                 err = mmc_send_cid(host, cid);
 750         else
 751                 err = mmc_all_send_cid(host, cid);
 752         if (err)
 753                 goto err;
 754
 755         if (oldcard) {
 756                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 757                         err = -ENOENT;
 758                         goto err;
 759                 }
 760
 761                 card = oldcard;
 762         } else {
 763                 /*
 764                  * Allocate card structure.
 765                  */
 766                 card = mmc_alloc_card(host, &mmc_type);
 767                 if (IS_ERR(card)) {
 768                         err = PTR_ERR(card);
 769                         goto err;
 770                 }
 771
 772                 card->type = MMC_TYPE_MMC;
 773                 card->rca = 1;
 774                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 775         }
 776
 777         /*
 778          * For native busses:  set card RCA and quit open drain mode.
 779          */
 780         if (!mmc_host_is_spi(host)) {
 781                 err = mmc_set_relative_addr(card);
 782                 if (err)
 783                         goto free_card;
 784
 785                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 786         }
 787
 788         if (!oldcard) {
 789                 /*
 790                  * Fetch CSD from card.
 791                  */
 792                 err = mmc_send_csd(card, card->raw_csd);
 793                 if (err)
 794                         goto free_card;
 795
 796                 err = mmc_decode_csd(card);
 797                 if (err)
 798                         goto free_card;
 799                 err = mmc_decode_cid(card);
 800                 if (err)
 801                         goto free_card;
 802         }
 803
 804         /*
 805          * Select card, as all following commands rely on that.
 806          */
 807         if (!mmc_host_is_spi(host)) {
 808                 err = mmc_select_card(card);
 809                 if (err)
 810                         goto free_card;
 811         }
 812
 813         if (!oldcard) {
 814                 /*
 815                  * Fetch and process extended CSD.
 816                  */
 817
 818                 err = mmc_get_ext_csd(card, &ext_csd);
 819                 if (err)
 820                         goto free_card;
 821                 err = mmc_read_ext_csd(card, ext_csd);
 822                 if (err)
 823                         goto free_card;
 824
 825                 /* If doing byte addressing, check if required to do sector
 826                  * addressing.  Handle the case of <2GB cards needing sector
 827                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 828                  * ocr register has bit 30 set for sector addressing.
 829                  */
 830                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 831                         mmc_card_set_blockaddr(card);
 832
 833                 /* Erase size depends on CSD and Extended CSD */
 834                 mmc_set_erase_size(card);
 835         }
 836
 837         /*
 838          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 839          * bit.  This bit will be lost every time after a reset or power off.
 840          */
 841         if (card->ext_csd.enhanced_area_en) {
 842                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 843                                  EXT_CSD_ERASE_GROUP_DEF, 1,
 844                                  card->ext_csd.generic_cmd6_time);
 845
 846                 if (err && err != -EBADMSG)
 847                         goto free_card;
 848
 849                 if (err) {
 850                         err = 0;
 851                         /*
 852                          * Just disable enhanced area off & sz
 853                          * will try to enable ERASE_GROUP_DEF
 854                          * during next time reinit
 855                          */
 856                         card->ext_csd.enhanced_area_offset = -EINVAL;
 857                         card->ext_csd.enhanced_area_size = -EINVAL;
 858                 } else {
 859                         card->ext_csd.erase_group_def = 1;
 860                         /*
 861                          * enable ERASE_GRP_DEF successfully.
 862                          * This will affect the erase size, so
 863                          * here need to reset erase size
 864                          */
 865                         mmc_set_erase_size(card);
 866                 }
 867         }
 868
 869         /*
 870          * Ensure eMMC user default partition is enabled
 871          */
 872         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
 873                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 874                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
 875                                  card->ext_csd.part_config,
 876                                  card->ext_csd.part_time);
 877                 if (err && err != -EBADMSG)
 878                         goto free_card;
 879         }
 880
 881         /*
 882          * If the host supports the power_off_notify capability then
 883          * set the notification byte in the ext_csd register of device
 884          */
 885         if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
 886             (card->ext_csd.rev >= 6)) {
 887                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 888                                  EXT_CSD_POWER_OFF_NOTIFICATION,
 889                                  EXT_CSD_POWER_ON,
 890                                  card->ext_csd.generic_cmd6_time);
 891                 if (err && err != -EBADMSG)
 892                         goto free_card;
 893
 894                 /*
 895                  * The err can be -EBADMSG or 0,
 896                  * so check for success and update the flag
 897                  */
 898                 if (!err)
 899                         card->poweroff_notify_state = MMC_POWERED_ON;
 900         }
 901
 902         /*
 903          * Activate high speed (if supported)
 904          */
 905         if ((card->ext_csd.hs_max_dtr != 0) &&
 906                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
 907                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 908                                  EXT_CSD_HS_TIMING, 1,
 909                                  card->ext_csd.generic_cmd6_time);
 910                 if (err && err != -EBADMSG)
 911                         goto free_card;
 912
 913                 if (err) {
 914                         pr_warning("%s: switch to highspeed failed\n",
 915                                mmc_hostname(card->host));
 916                         err = 0;
 917                 } else {
 918                         mmc_card_set_highspeed(card);
 919                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
 920                 }
 921         }
 922
 923         /*
 924          * Enable HPI feature (if supported)
 925          */
 926         if (card->ext_csd.hpi) {
 927                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 928                         EXT_CSD_HPI_MGMT, 1, 0);
 929                 if (err && err != -EBADMSG)
 930                         goto free_card;
 931                 if (err) {
 932                         pr_warning("%s: Enabling HPI failed\n",
 933                                    mmc_hostname(card->host));
 934                         err = 0;
 935                 } else
 936                         card->ext_csd.hpi_en = 1;
 937         }
 938
 939         /*
 940          * Compute bus speed.
 941          */
 942         max_dtr = (unsigned int)-1;
 943
 944         if (mmc_card_highspeed(card)) {
 945                 if (max_dtr > card->ext_csd.hs_max_dtr)
 946                         max_dtr = card->ext_csd.hs_max_dtr;
 947         } else if (max_dtr > card->csd.max_dtr) {
 948                 max_dtr = card->csd.max_dtr;
 949         }
 950
 951         mmc_set_clock(host, max_dtr);
 952
 953         /*
 954          * Indicate DDR mode (if supported).
 955          */
 956         if (mmc_card_highspeed(card)) {
 957                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
 958                         && ((host->caps & (MMC_CAP_1_8V_DDR |
 959                              MMC_CAP_UHS_DDR50))
 960                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
 961                                 ddr = MMC_1_8V_DDR_MODE;
 962                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
 963                         && ((host->caps & (MMC_CAP_1_2V_DDR |
 964                              MMC_CAP_UHS_DDR50))
 965                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
 966                                 ddr = MMC_1_2V_DDR_MODE;
 967         }
 968
 969         /*
 970          * Activate wide bus and DDR (if supported).
 971          */
 972         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
 973             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
 974                 static unsigned ext_csd_bits[][2] = {
 975                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
 976                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
 977                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
 978                 };
 979                 static unsigned bus_widths[] = {
 980                         MMC_BUS_WIDTH_8,
 981                         MMC_BUS_WIDTH_4,
 982                         MMC_BUS_WIDTH_1
 983                 };
 984                 unsigned idx, bus_width = 0;
 985
 986                 if (host->caps & MMC_CAP_8_BIT_DATA)
 987                         idx = 0;
 988                 else
 989                         idx = 1;
 990                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 991                         bus_width = bus_widths[idx];
 992                         if (bus_width == MMC_BUS_WIDTH_1)
 993                                 ddr = 0; /* no DDR for 1-bit width */
 994                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
 995                                                     ext_csd);
 996                         if (err)
 997                                 pr_err("%s: power class selection to "
 998                                        "bus width %d failed\n",
 999                                        mmc_hostname(card->host),
1000                                        1 << bus_width);
1001
1002                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1003                                          EXT_CSD_BUS_WIDTH,
1004                                          ext_csd_bits[idx][0],
1005                                          card->ext_csd.generic_cmd6_time);
1006                         if (!err) {
1007                                 mmc_set_bus_width(card->host, bus_width);
1008
1009                                 /*
1010                                  * If controller can't handle bus width test,
1011                                  * compare ext_csd previously read in 1 bit mode
1012                                  * against ext_csd at new bus width
1013                                  */
1014                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1015                                         err = mmc_compare_ext_csds(card,
1016                                                 bus_width);
1017                                 else
1018                                         err = mmc_bus_test(card, bus_width);
1019                                 if (!err)
1020                                         break;
1021                         }
1022                 }
1023
1024                 if (!err && ddr) {
1025                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1026                                                     ext_csd);
1027                         if (err)
1028                                 pr_err("%s: power class selection to "
1029                                        "bus width %d ddr %d failed\n",
1030                                        mmc_hostname(card->host),
1031                                        1 << bus_width, ddr);
1032
1033                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1034                                          EXT_CSD_BUS_WIDTH,
1035                                          ext_csd_bits[idx][1],
1036                                          card->ext_csd.generic_cmd6_time);
1037                 }
1038                 if (err) {
1039                         pr_warning("%s: switch to bus width %d ddr %d "
1040                                 "failed\n", mmc_hostname(card->host),
1041                                 1 << bus_width, ddr);
1042                         goto free_card;
1043                 } else if (ddr) {
1044                         /*
1045                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1046                          * signaling.
1047                          *
1048                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1049                          *
1050                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1051                          * in the JEDEC spec for DDR.
1052                          *
1053                          * Do not force change in vccq since we are obviously
1054                          * working and no change to vccq is needed.
1055                          *
1056                          * WARNING: eMMC rules are NOT the same as SD DDR
1057                          */
1058                         if (ddr == MMC_1_2V_DDR_MODE) {
1059                                 err = mmc_set_signal_voltage(host,
1060                                         MMC_SIGNAL_VOLTAGE_120, 0);
1061                                 if (err)
1062                                         goto err;
1063                         }
1064                         mmc_card_set_ddr_mode(card);
1065                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1066                         mmc_set_bus_width(card->host, bus_width);
1067                 }
1068         }
1069
1070         /*
1071          * If cache size is higher than 0, this indicates
1072          * the existence of cache and it can be turned on.
1073          */
1074         if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1075                         card->ext_csd.cache_size > 0) {
1076                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1077                                 EXT_CSD_CACHE_CTRL, 1, 0);
1078                 if (err && err != -EBADMSG)
1079                         goto free_card;
1080
1081                 /*
1082                  * Only if no error, cache is turned on successfully.
1083                  */
1084                 card->ext_csd.cache_ctrl = err ? 0 : 1;
1085         }
1086
1087         if (!oldcard)
1088                 host->card = card;
1089
1090         mmc_free_ext_csd(ext_csd);
1091         return 0;
1092
1093 free_card:
1094         if (!oldcard)
1095                 mmc_remove_card(card);
1096 err:
1097         mmc_free_ext_csd(ext_csd);
1098
1099         return err;
1100 }
1101
1102 /*
1103  * Host is being removed. Free up the current card.
1104  */
1105 static void mmc_remove(struct mmc_host *host)
1106 {
1107         BUG_ON(!host);
1108         BUG_ON(!host->card);
1109
1110         mmc_remove_card(host->card);
1111         host->card = NULL;
1112 }
1113
1114 /*
1115  * Card detection callback from host.
1116  */
1117 static void mmc_detect(struct mmc_host *host)
1118 {
1119         int err;
1120
1121         BUG_ON(!host);
1122         BUG_ON(!host->card);
1123
1124         mmc_claim_host(host);
1125
1126         /*
1127          * Just check if our card has been removed.
1128          */
1129         err = mmc_send_status(host->card, NULL);
1130
1131         mmc_release_host(host);
1132
1133         if (err) {
1134                 mmc_remove(host);
1135
1136                 mmc_claim_host(host);
1137                 mmc_detach_bus(host);
1138                 mmc_power_off(host);
1139                 mmc_release_host(host);
1140         }
1141 }
1142
1143 /*
1144  * Suspend callback from host.
1145  */
1146 static int mmc_suspend(struct mmc_host *host)
1147 {
1148         int err = 0;
1149
1150         BUG_ON(!host);
1151         BUG_ON(!host->card);
1152
1153         mmc_claim_host(host);
1154         if (mmc_card_can_sleep(host))
1155                 err = mmc_card_sleep(host);
1156         else if (!mmc_host_is_spi(host))
1157                 mmc_deselect_cards(host);
1158         host->card->state &= ~MMC_STATE_HIGHSPEED;
1159         mmc_release_host(host);
1160
1161         return err;
1162 }
1163
1164 /*
1165  * Resume callback from host.
1166  *
1167  * This function tries to determine if the same card is still present
1168  * and, if so, restore all state to it.
1169  */
1170 static int mmc_resume(struct mmc_host *host)
1171 {
1172         int err;
1173
1174         BUG_ON(!host);
1175         BUG_ON(!host->card);
1176
1177         mmc_claim_host(host);
1178         err = mmc_init_card(host, host->ocr, host->card);
1179         mmc_release_host(host);
1180
1181         return err;
1182 }
1183
1184 static int mmc_power_restore(struct mmc_host *host)
1185 {
1186         int ret;
1187
1188         host->card->state &= ~MMC_STATE_HIGHSPEED;
1189         mmc_claim_host(host);
1190         ret = mmc_init_card(host, host->ocr, host->card);
1191         mmc_release_host(host);
1192
1193         return ret;
1194 }
1195
1196 static int mmc_sleep(struct mmc_host *host)
1197 {
1198         struct mmc_card *card = host->card;
1199         int err = -ENOSYS;
1200
1201         if (card && card->ext_csd.rev >= 3) {
1202                 err = mmc_card_sleepawake(host, 1);
1203                 if (err < 0)
1204                         pr_debug("%s: Error %d while putting card into sleep",
1205                                  mmc_hostname(host), err);
1206         }
1207
1208         return err;
1209 }
1210
1211 static int mmc_awake(struct mmc_host *host)
1212 {
1213         struct mmc_card *card = host->card;
1214         int err = -ENOSYS;
1215
1216         if (card && card->ext_csd.rev >= 3) {
1217                 err = mmc_card_sleepawake(host, 0);
1218                 if (err < 0)
1219                         pr_debug("%s: Error %d while awaking sleeping card",
1220                                  mmc_hostname(host), err);
1221         }
1222
1223         return err;
1224 }
1225
1226 static const struct mmc_bus_ops mmc_ops = {
1227         .awake = mmc_awake,
1228         .sleep = mmc_sleep,
1229         .remove = mmc_remove,
1230         .detect = mmc_detect,
1231         .suspend = NULL,
1232         .resume = NULL,
1233         .power_restore = mmc_power_restore,
1234 };
1235
1236 static const struct mmc_bus_ops mmc_ops_unsafe = {
1237         .awake = mmc_awake,
1238         .sleep = mmc_sleep,
1239         .remove = mmc_remove,
1240         .detect = mmc_detect,
1241         .suspend = mmc_suspend,
1242         .resume = mmc_resume,
1243         .power_restore = mmc_power_restore,
1244 };
1245
1246 static void mmc_attach_bus_ops(struct mmc_host *host)
1247 {
1248         const struct mmc_bus_ops *bus_ops;
1249
1250         if (!mmc_card_is_removable(host))
1251                 bus_ops = &mmc_ops_unsafe;
1252         else
1253                 bus_ops = &mmc_ops;
1254         mmc_attach_bus(host, bus_ops);
1255 }
1256
1257 /*
1258  * Starting point for MMC card init.
1259  */
1260 int mmc_attach_mmc(struct mmc_host *host)
1261 {
1262         int err;
1263         u32 ocr;
1264
1265         BUG_ON(!host);
1266         WARN_ON(!host->claimed);
1267
1268         /* Set correct bus mode for MMC before attempting attach */
1269         if (!mmc_host_is_spi(host))
1270                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1271
1272         err = mmc_send_op_cond(host, 0, &ocr);
1273         if (err)
1274                 return err;
1275
1276         mmc_attach_bus_ops(host);
1277         if (host->ocr_avail_mmc)
1278                 host->ocr_avail = host->ocr_avail_mmc;
1279
1280         /*
1281          * We need to get OCR a different way for SPI.
1282          */
1283         if (mmc_host_is_spi(host)) {
1284                 err = mmc_spi_read_ocr(host, 1, &ocr);
1285                 if (err)
1286                         goto err;
1287         }
1288
1289         /*
1290          * Sanity check the voltages that the card claims to
1291          * support.
1292          */
1293         if (ocr & 0x7F) {
1294                 pr_warning("%s: card claims to support voltages "
1295                        "below the defined range. These will be ignored.\n",
1296                        mmc_hostname(host));
1297                 ocr &= ~0x7F;
1298         }
1299
1300         host->ocr = mmc_select_voltage(host, ocr);
1301
1302         /*
1303          * Can we support the voltage of the card?
1304          */
1305         if (!host->ocr) {
1306                 err = -EINVAL;
1307                 goto err;
1308         }
1309
1310         /*
1311          * Detect and init the card.
1312          */
1313         err = mmc_init_card(host, host->ocr, NULL);
1314         if (err)
1315                 goto err;
1316
1317         mmc_release_host(host);
1318         err = mmc_add_card(host->card);
1319         mmc_claim_host(host);
1320         if (err)
1321                 goto remove_card;
1322
1323         return 0;
1324
1325 remove_card:
1326         mmc_release_host(host);
1327         mmc_remove_card(host->card);
1328         mmc_claim_host(host);
1329         host->card = NULL;
1330 err:
1331         mmc_detach_bus(host);
1332
1333         pr_err("%s: error %d whilst initialising MMC card\n",
1334                 mmc_hostname(host), err);
1335
1336         return err;
1337 }