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 #include <linux/pm_runtime.h>
  17
  18 #include <linux/mmc/host.h>
  19 #include <linux/mmc/card.h>
  20 #include <linux/mmc/mmc.h>
  21
  22 #include "core.h"
  23 #include "bus.h"
  24 #include "mmc_ops.h"
  25 #include "sd_ops.h"
  26
  27 static const unsigned int tran_exp[] = {
  28         10000,          100000,         1000000,        10000000,
  29         0,              0,              0,              0
  30 };
  31
  32 static const unsigned char tran_mant[] = {
  33         0,      10,     12,     13,     15,     20,     25,     30,
  34         35,     40,     45,     50,     55,     60,     70,     80,
  35 };
  36
  37 static const unsigned int tacc_exp[] = {
  38         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  39 };
  40
  41 static const unsigned int tacc_mant[] = {
  42         0,      10,     12,     13,     15,     20,     25,     30,
  43         35,     40,     45,     50,     55,     60,     70,     80,
  44 };
  45
  46 #define UNSTUFF_BITS(resp,start,size)                                   \
  47         ({                                                              \
  48                 const int __size = size;                                \
  49                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  50                 const int __off = 3 - ((start) / 32);                   \
  51                 const int __shft = (start) & 31;                        \
  52                 u32 __res;                                              \
  53                                                                         \
  54                 __res = resp[__off] >> __shft;                          \
  55                 if (__size + __shft > 32)                               \
  56                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  57                 __res & __mask;                                         \
  58         })
  59
  60 /*
  61  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  62  */
  63 static int mmc_decode_cid(struct mmc_card *card)
  64 {
  65         u32 *resp = card->raw_cid;
  66
  67         /*
  68          * The selection of the format here is based upon published
  69          * specs from sandisk and from what people have reported.
  70          */
  71         switch (card->csd.mmca_vsn) {
  72         case 0: /* MMC v1.0 - v1.2 */
  73         case 1: /* MMC v1.4 */
  74                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  75                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  76                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  77                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  78                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  79                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  80                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  81                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  82                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  83                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  84                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  85                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  86                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  87                 break;
  88
  89         case 2: /* MMC v2.0 - v2.2 */
  90         case 3: /* MMC v3.1 - v3.3 */
  91         case 4: /* MMC v4 */
  92                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
  93                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
  94                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  95                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  96                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  97                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  98                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  99                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
 100                 card->cid.prv           = UNSTUFF_BITS(resp, 48, 8);
 101                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 102                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 103                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 104                 break;
 105
 106         default:
 107                 pr_err("%s: card has unknown MMCA version %d\n",
 108                         mmc_hostname(card->host), card->csd.mmca_vsn);
 109                 return -EINVAL;
 110         }
 111
 112         return 0;
 113 }
 114
 115 static void mmc_set_erase_size(struct mmc_card *card)
 116 {
 117         if (card->ext_csd.erase_group_def & 1)
 118                 card->erase_size = card->ext_csd.hc_erase_size;
 119         else
 120                 card->erase_size = card->csd.erase_size;
 121
 122         mmc_init_erase(card);
 123 }
 124
 125 /*
 126  * Given a 128-bit response, decode to our card CSD structure.
 127  */
 128 static int mmc_decode_csd(struct mmc_card *card)
 129 {
 130         struct mmc_csd *csd = &card->csd;
 131         unsigned int e, m, a, b;
 132         u32 *resp = card->raw_csd;
 133
 134         /*
 135          * We only understand CSD structure v1.1 and v1.2.
 136          * v1.2 has extra information in bits 15, 11 and 10.
 137          * We also support eMMC v4.4 & v4.41.
 138          */
 139         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 140         if (csd->structure == 0) {
 141                 pr_err("%s: unrecognised CSD structure version %d\n",
 142                         mmc_hostname(card->host), csd->structure);
 143                 return -EINVAL;
 144         }
 145
 146         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 147         m = UNSTUFF_BITS(resp, 115, 4);
 148         e = UNSTUFF_BITS(resp, 112, 3);
 149         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 150         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 151
 152         m = UNSTUFF_BITS(resp, 99, 4);
 153         e = UNSTUFF_BITS(resp, 96, 3);
 154         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 155         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 156
 157         e = UNSTUFF_BITS(resp, 47, 3);
 158         m = UNSTUFF_BITS(resp, 62, 12);
 159         csd->capacity     = (1 + m) << (e + 2);
 160
 161         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 162         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 163         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 164         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 165         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 166         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 167         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 168
 169         if (csd->write_blkbits >= 9) {
 170                 a = UNSTUFF_BITS(resp, 42, 5);
 171                 b = UNSTUFF_BITS(resp, 37, 5);
 172                 csd->erase_size = (a + 1) * (b + 1);
 173                 csd->erase_size <<= csd->write_blkbits - 9;
 174         }
 175
 176         return 0;
 177 }
 178
 179 /*
 180  * Read extended CSD.
 181  */
 182 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
 183 {
 184         int err;
 185         u8 *ext_csd;
 186
 187         BUG_ON(!card);
 188         BUG_ON(!new_ext_csd);
 189
 190         *new_ext_csd = NULL;
 191
 192         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 193                 return 0;
 194
 195         /*
 196          * As the ext_csd is so large and mostly unused, we don't store the
 197          * raw block in mmc_card.
 198          */
 199         ext_csd = kmalloc(512, GFP_KERNEL);
 200         if (!ext_csd) {
 201                 pr_err("%s: could not allocate a buffer to "
 202                         "receive the ext_csd.\n", mmc_hostname(card->host));
 203                 return -ENOMEM;
 204         }
 205
 206         err = mmc_send_ext_csd(card, ext_csd);
 207         if (err) {
 208                 kfree(ext_csd);
 209                 *new_ext_csd = NULL;
 210
 211                 /* If the host or the card can't do the switch,
 212                  * fail more gracefully. */
 213                 if ((err != -EINVAL)
 214                  && (err != -ENOSYS)
 215                  && (err != -EFAULT))
 216                         return err;
 217
 218                 /*
 219                  * High capacity cards should have this "magic" size
 220                  * stored in their CSD.
 221                  */
 222                 if (card->csd.capacity == (4096 * 512)) {
 223                         pr_err("%s: unable to read EXT_CSD "
 224                                 "on a possible high capacity card. "
 225                                 "Card will be ignored.\n",
 226                                 mmc_hostname(card->host));
 227                 } else {
 228                         pr_warning("%s: unable to read "
 229                                 "EXT_CSD, performance might "
 230                                 "suffer.\n",
 231                                 mmc_hostname(card->host));
 232                         err = 0;
 233                 }
 234         } else
 235                 *new_ext_csd = ext_csd;
 236
 237         return err;
 238 }
 239
 240 static void mmc_select_card_type(struct mmc_card *card)
 241 {
 242         struct mmc_host *host = card->host;
 243         u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK;
 244         u32 caps = host->caps, caps2 = host->caps2;
 245         unsigned int hs_max_dtr = 0;
 246
 247         if (card_type & EXT_CSD_CARD_TYPE_26)
 248                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
 249
 250         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 251                         card_type & EXT_CSD_CARD_TYPE_52)
 252                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
 253
 254         if ((caps & MMC_CAP_1_8V_DDR &&
 255                         card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) ||
 256             (caps & MMC_CAP_1_2V_DDR &&
 257                         card_type & EXT_CSD_CARD_TYPE_DDR_1_2V))
 258                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 259
 260         if ((caps2 & MMC_CAP2_HS200_1_8V_SDR &&
 261                         card_type & EXT_CSD_CARD_TYPE_SDR_1_8V) ||
 262             (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
 263                         card_type & EXT_CSD_CARD_TYPE_SDR_1_2V))
 264                 hs_max_dtr = MMC_HS200_MAX_DTR;
 265
 266         card->ext_csd.hs_max_dtr = hs_max_dtr;
 267         card->ext_csd.card_type = card_type;
 268 }
 269
 270 /*
 271  * Decode extended CSD.
 272  */
 273 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 274 {
 275         int err = 0, idx;
 276         unsigned int part_size;
 277         u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
 278
 279         BUG_ON(!card);
 280
 281         if (!ext_csd)
 282                 return 0;
 283
 284         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 285         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 286         if (card->csd.structure == 3) {
 287                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 288                         pr_err("%s: unrecognised EXT_CSD structure "
 289                                 "version %d\n", mmc_hostname(card->host),
 290                                         card->ext_csd.raw_ext_csd_structure);
 291                         err = -EINVAL;
 292                         goto out;
 293                 }
 294         }
 295
 296         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 297         if (card->ext_csd.rev > 7) {
 298                 pr_err("%s: unrecognised EXT_CSD revision %d\n",
 299                         mmc_hostname(card->host), card->ext_csd.rev);
 300                 err = -EINVAL;
 301                 goto out;
 302         }
 303
 304         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 305         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 306         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 307         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 308         if (card->ext_csd.rev >= 2) {
 309                 card->ext_csd.sectors =
 310                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 311                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 312                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 313                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 314
 315                 /* Cards with density > 2GiB are sector addressed */
 316                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 317                         mmc_card_set_blockaddr(card);
 318         }
 319
 320         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 321         mmc_select_card_type(card);
 322
 323         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 324         card->ext_csd.raw_erase_timeout_mult =
 325                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 326         card->ext_csd.raw_hc_erase_grp_size =
 327                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 328         if (card->ext_csd.rev >= 3) {
 329                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 330                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 331
 332                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 333                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 334
 335                 /* Sleep / awake timeout in 100ns units */
 336                 if (sa_shift > 0 && sa_shift <= 0x17)
 337                         card->ext_csd.sa_timeout =
 338                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 339                 card->ext_csd.erase_group_def =
 340                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 341                 card->ext_csd.hc_erase_timeout = 300 *
 342                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 343                 card->ext_csd.hc_erase_size =
 344                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 345
 346                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 347
 348                 /*
 349                  * There are two boot regions of equal size, defined in
 350                  * multiples of 128K.
 351                  */
 352                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 353                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 354                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 355                                 mmc_part_add(card, part_size,
 356                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 357                                         "boot%d", idx, true,
 358                                         MMC_BLK_DATA_AREA_BOOT);
 359                         }
 360                 }
 361         }
 362
 363         card->ext_csd.raw_hc_erase_gap_size =
 364                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 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                                         MMC_BLK_DATA_AREA_GP);
 447                         }
 448                 }
 449                 card->ext_csd.sec_trim_mult =
 450                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 451                 card->ext_csd.sec_erase_mult =
 452                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 453                 card->ext_csd.sec_feature_support =
 454                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 455                 card->ext_csd.trim_timeout = 300 *
 456                         ext_csd[EXT_CSD_TRIM_MULT];
 457
 458                 /*
 459                  * Note that the call to mmc_part_add above defaults to read
 460                  * only. If this default assumption is changed, the call must
 461                  * take into account the value of boot_locked below.
 462                  */
 463                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 464                 card->ext_csd.boot_ro_lockable = true;
 465
 466                 /* Save power class values */
 467                 card->ext_csd.raw_pwr_cl_52_195 =
 468                         ext_csd[EXT_CSD_PWR_CL_52_195];
 469                 card->ext_csd.raw_pwr_cl_26_195 =
 470                         ext_csd[EXT_CSD_PWR_CL_26_195];
 471                 card->ext_csd.raw_pwr_cl_52_360 =
 472                         ext_csd[EXT_CSD_PWR_CL_52_360];
 473                 card->ext_csd.raw_pwr_cl_26_360 =
 474                         ext_csd[EXT_CSD_PWR_CL_26_360];
 475                 card->ext_csd.raw_pwr_cl_200_195 =
 476                         ext_csd[EXT_CSD_PWR_CL_200_195];
 477                 card->ext_csd.raw_pwr_cl_200_360 =
 478                         ext_csd[EXT_CSD_PWR_CL_200_360];
 479                 card->ext_csd.raw_pwr_cl_ddr_52_195 =
 480                         ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
 481                 card->ext_csd.raw_pwr_cl_ddr_52_360 =
 482                         ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
 483         }
 484
 485         if (card->ext_csd.rev >= 5) {
 486                 /* Adjust production date as per JEDEC JESD84-B451 */
 487                 if (card->cid.year < 2010)
 488                         card->cid.year += 16;
 489
 490                 /* check whether the eMMC card supports BKOPS */
 491                 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
 492                         card->ext_csd.bkops = 1;
 493                         card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN];
 494                         card->ext_csd.raw_bkops_status =
 495                                 ext_csd[EXT_CSD_BKOPS_STATUS];
 496                         if (!card->ext_csd.bkops_en)
 497                                 pr_info("%s: BKOPS_EN bit is not set\n",
 498                                         mmc_hostname(card->host));
 499                 }
 500
 501                 /* check whether the eMMC card supports HPI */
 502                 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
 503                         card->ext_csd.hpi = 1;
 504                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 505                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 506                         else
 507                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 508                         /*
 509                          * Indicate the maximum timeout to close
 510                          * a command interrupted by HPI
 511                          */
 512                         card->ext_csd.out_of_int_time =
 513                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 514                 }
 515
 516                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 517                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 518
 519                 /*
 520                  * RPMB regions are defined in multiples of 128K.
 521                  */
 522                 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
 523                 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
 524                         mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
 525                                 EXT_CSD_PART_CONFIG_ACC_RPMB,
 526                                 "rpmb", 0, false,
 527                                 MMC_BLK_DATA_AREA_RPMB);
 528                 }
 529         }
 530
 531         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 532         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 533                 card->erased_byte = 0xFF;
 534         else
 535                 card->erased_byte = 0x0;
 536
 537         /* eMMC v4.5 or later */
 538         if (card->ext_csd.rev >= 6) {
 539                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 540
 541                 card->ext_csd.generic_cmd6_time = 10 *
 542                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 543                 card->ext_csd.power_off_longtime = 10 *
 544                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 545
 546                 card->ext_csd.cache_size =
 547                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 548                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 549                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 550                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 551
 552                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 553                         card->ext_csd.data_sector_size = 4096;
 554                 else
 555                         card->ext_csd.data_sector_size = 512;
 556
 557                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 558                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 559                         card->ext_csd.data_tag_unit_size =
 560                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 561                         (card->ext_csd.data_sector_size);
 562                 } else {
 563                         card->ext_csd.data_tag_unit_size = 0;
 564                 }
 565
 566                 card->ext_csd.max_packed_writes =
 567                         ext_csd[EXT_CSD_MAX_PACKED_WRITES];
 568                 card->ext_csd.max_packed_reads =
 569                         ext_csd[EXT_CSD_MAX_PACKED_READS];
 570         } else {
 571                 card->ext_csd.data_sector_size = 512;
 572         }
 573
 574 out:
 575         return err;
 576 }
 577
 578 static inline void mmc_free_ext_csd(u8 *ext_csd)
 579 {
 580         kfree(ext_csd);
 581 }
 582
 583
 584 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 585 {
 586         u8 *bw_ext_csd;
 587         int err;
 588
 589         if (bus_width == MMC_BUS_WIDTH_1)
 590                 return 0;
 591
 592         err = mmc_get_ext_csd(card, &bw_ext_csd);
 593
 594         if (err || bw_ext_csd == NULL) {
 595                 err = -EINVAL;
 596                 goto out;
 597         }
 598
 599         /* only compare read only fields */
 600         err = !((card->ext_csd.raw_partition_support ==
 601                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 602                 (card->ext_csd.raw_erased_mem_count ==
 603                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 604                 (card->ext_csd.rev ==
 605                         bw_ext_csd[EXT_CSD_REV]) &&
 606                 (card->ext_csd.raw_ext_csd_structure ==
 607                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 608                 (card->ext_csd.raw_card_type ==
 609                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 610                 (card->ext_csd.raw_s_a_timeout ==
 611                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 612                 (card->ext_csd.raw_hc_erase_gap_size ==
 613                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 614                 (card->ext_csd.raw_erase_timeout_mult ==
 615                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 616                 (card->ext_csd.raw_hc_erase_grp_size ==
 617                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 618                 (card->ext_csd.raw_sec_trim_mult ==
 619                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 620                 (card->ext_csd.raw_sec_erase_mult ==
 621                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 622                 (card->ext_csd.raw_sec_feature_support ==
 623                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 624                 (card->ext_csd.raw_trim_mult ==
 625                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 626                 (card->ext_csd.raw_sectors[0] ==
 627                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 628                 (card->ext_csd.raw_sectors[1] ==
 629                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 630                 (card->ext_csd.raw_sectors[2] ==
 631                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 632                 (card->ext_csd.raw_sectors[3] ==
 633                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
 634                 (card->ext_csd.raw_pwr_cl_52_195 ==
 635                         bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
 636                 (card->ext_csd.raw_pwr_cl_26_195 ==
 637                         bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
 638                 (card->ext_csd.raw_pwr_cl_52_360 ==
 639                         bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
 640                 (card->ext_csd.raw_pwr_cl_26_360 ==
 641                         bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
 642                 (card->ext_csd.raw_pwr_cl_200_195 ==
 643                         bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
 644                 (card->ext_csd.raw_pwr_cl_200_360 ==
 645                         bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
 646                 (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
 647                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
 648                 (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
 649                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]));
 650         if (err)
 651                 err = -EINVAL;
 652
 653 out:
 654         mmc_free_ext_csd(bw_ext_csd);
 655         return err;
 656 }
 657
 658 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 659         card->raw_cid[2], card->raw_cid[3]);
 660 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 661         card->raw_csd[2], card->raw_csd[3]);
 662 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 663 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 664 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 665 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 666 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 667 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 668 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 669 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 670 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
 671 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 672 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 673                 card->ext_csd.enhanced_area_offset);
 674 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 675 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
 676 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
 677
 678 static struct attribute *mmc_std_attrs[] = {
 679         &dev_attr_cid.attr,
 680         &dev_attr_csd.attr,
 681         &dev_attr_date.attr,
 682         &dev_attr_erase_size.attr,
 683         &dev_attr_preferred_erase_size.attr,
 684         &dev_attr_fwrev.attr,
 685         &dev_attr_hwrev.attr,
 686         &dev_attr_manfid.attr,
 687         &dev_attr_name.attr,
 688         &dev_attr_oemid.attr,
 689         &dev_attr_prv.attr,
 690         &dev_attr_serial.attr,
 691         &dev_attr_enhanced_area_offset.attr,
 692         &dev_attr_enhanced_area_size.attr,
 693         &dev_attr_raw_rpmb_size_mult.attr,
 694         &dev_attr_rel_sectors.attr,
 695         NULL,
 696 };
 697
 698 static struct attribute_group mmc_std_attr_group = {
 699         .attrs = mmc_std_attrs,
 700 };
 701
 702 static const struct attribute_group *mmc_attr_groups[] = {
 703         &mmc_std_attr_group,
 704         NULL,
 705 };
 706
 707 static struct device_type mmc_type = {
 708         .groups = mmc_attr_groups,
 709 };
 710
 711 /*
 712  * Select the PowerClass for the current bus width
 713  * If power class is defined for 4/8 bit bus in the
 714  * extended CSD register, select it by executing the
 715  * mmc_switch command.
 716  */
 717 static int mmc_select_powerclass(struct mmc_card *card,
 718                 unsigned int bus_width)
 719 {
 720         int err = 0;
 721         unsigned int pwrclass_val = 0;
 722         struct mmc_host *host;
 723
 724         BUG_ON(!card);
 725
 726         host = card->host;
 727         BUG_ON(!host);
 728
 729         /* Power class selection is supported for versions >= 4.0 */
 730         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 731                 return 0;
 732
 733         /* Power class values are defined only for 4/8 bit bus */
 734         if (bus_width == EXT_CSD_BUS_WIDTH_1)
 735                 return 0;
 736
 737         switch (1 << host->ios.vdd) {
 738         case MMC_VDD_165_195:
 739                 if (host->ios.clock <= 26000000)
 740                         pwrclass_val = card->ext_csd.raw_pwr_cl_26_195;
 741                 else if (host->ios.clock <= 52000000)
 742                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 743                                 card->ext_csd.raw_pwr_cl_52_195 :
 744                                 card->ext_csd.raw_pwr_cl_ddr_52_195;
 745                 else if (host->ios.clock <= 200000000)
 746                         pwrclass_val = card->ext_csd.raw_pwr_cl_200_195;
 747                 break;
 748         case MMC_VDD_27_28:
 749         case MMC_VDD_28_29:
 750         case MMC_VDD_29_30:
 751         case MMC_VDD_30_31:
 752         case MMC_VDD_31_32:
 753         case MMC_VDD_32_33:
 754         case MMC_VDD_33_34:
 755         case MMC_VDD_34_35:
 756         case MMC_VDD_35_36:
 757                 if (host->ios.clock <= 26000000)
 758                         pwrclass_val = card->ext_csd.raw_pwr_cl_26_360;
 759                 else if (host->ios.clock <= 52000000)
 760                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 761                                 card->ext_csd.raw_pwr_cl_52_360 :
 762                                 card->ext_csd.raw_pwr_cl_ddr_52_360;
 763                 else if (host->ios.clock <= 200000000)
 764                         pwrclass_val = card->ext_csd.raw_pwr_cl_200_360;
 765                 break;
 766         default:
 767                 pr_warning("%s: Voltage range not supported "
 768                            "for power class.\n", mmc_hostname(host));
 769                 return -EINVAL;
 770         }
 771
 772         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 773                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 774                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 775         else
 776                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 777                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 778
 779         /* If the power class is different from the default value */
 780         if (pwrclass_val > 0) {
 781                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 782                                  EXT_CSD_POWER_CLASS,
 783                                  pwrclass_val,
 784                                  card->ext_csd.generic_cmd6_time);
 785         }
 786
 787         return err;
 788 }
 789
 790 /*
 791  * Selects the desired buswidth and switch to the HS200 mode
 792  * if bus width set without error
 793  */
 794 static int mmc_select_hs200(struct mmc_card *card)
 795 {
 796         int idx, err = -EINVAL;
 797         struct mmc_host *host;
 798         static unsigned ext_csd_bits[] = {
 799                 EXT_CSD_BUS_WIDTH_4,
 800                 EXT_CSD_BUS_WIDTH_8,
 801         };
 802         static unsigned bus_widths[] = {
 803                 MMC_BUS_WIDTH_4,
 804                 MMC_BUS_WIDTH_8,
 805         };
 806
 807         BUG_ON(!card);
 808
 809         host = card->host;
 810
 811         if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
 812                         host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
 813                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
 814
 815         if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V &&
 816                         host->caps2 & MMC_CAP2_HS200_1_8V_SDR)
 817                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
 818
 819         /* If fails try again during next card power cycle */
 820         if (err)
 821                 goto err;
 822
 823         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0;
 824
 825         /*
 826          * Unlike SD, MMC cards dont have a configuration register to notify
 827          * supported bus width. So bus test command should be run to identify
 828          * the supported bus width or compare the ext csd values of current
 829          * bus width and ext csd values of 1 bit mode read earlier.
 830          */
 831         for (; idx >= 0; idx--) {
 832
 833                 /*
 834                  * Host is capable of 8bit transfer, then switch
 835                  * the device to work in 8bit transfer mode. If the
 836                  * mmc switch command returns error then switch to
 837                  * 4bit transfer mode. On success set the corresponding
 838                  * bus width on the host.
 839                  */
 840                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 841                                  EXT_CSD_BUS_WIDTH,
 842                                  ext_csd_bits[idx],
 843                                  card->ext_csd.generic_cmd6_time);
 844                 if (err)
 845                         continue;
 846
 847                 mmc_set_bus_width(card->host, bus_widths[idx]);
 848
 849                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 850                         err = mmc_compare_ext_csds(card, bus_widths[idx]);
 851                 else
 852                         err = mmc_bus_test(card, bus_widths[idx]);
 853                 if (!err)
 854                         break;
 855         }
 856
 857         /* switch to HS200 mode if bus width set successfully */
 858         if (!err)
 859                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 860                                  EXT_CSD_HS_TIMING, 2, 0);
 861 err:
 862         return err;
 863 }
 864
 865 /*
 866  * Handle the detection and initialisation of a card.
 867  *
 868  * In the case of a resume, "oldcard" will contain the card
 869  * we're trying to reinitialise.
 870  */
 871 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 872         struct mmc_card *oldcard)
 873 {
 874         struct mmc_card *card;
 875         int err, ddr = 0;
 876         u32 cid[4];
 877         unsigned int max_dtr;
 878         u32 rocr;
 879         u8 *ext_csd = NULL;
 880
 881         BUG_ON(!host);
 882         WARN_ON(!host->claimed);
 883
 884         /* Set correct bus mode for MMC before attempting init */
 885         if (!mmc_host_is_spi(host))
 886                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 887
 888         /*
 889          * Since we're changing the OCR value, we seem to
 890          * need to tell some cards to go back to the idle
 891          * state.  We wait 1ms to give cards time to
 892          * respond.
 893          * mmc_go_idle is needed for eMMC that are asleep
 894          */
 895         mmc_go_idle(host);
 896
 897         /* The extra bit indicates that we support high capacity */
 898         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 899         if (err)
 900                 goto err;
 901
 902         /*
 903          * For SPI, enable CRC as appropriate.
 904          */
 905         if (mmc_host_is_spi(host)) {
 906                 err = mmc_spi_set_crc(host, use_spi_crc);
 907                 if (err)
 908                         goto err;
 909         }
 910
 911         /*
 912          * Fetch CID from card.
 913          */
 914         if (mmc_host_is_spi(host))
 915                 err = mmc_send_cid(host, cid);
 916         else
 917                 err = mmc_all_send_cid(host, cid);
 918         if (err)
 919                 goto err;
 920
 921         if (oldcard) {
 922                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 923                         err = -ENOENT;
 924                         goto err;
 925                 }
 926
 927                 card = oldcard;
 928         } else {
 929                 /*
 930                  * Allocate card structure.
 931                  */
 932                 card = mmc_alloc_card(host, &mmc_type);
 933                 if (IS_ERR(card)) {
 934                         err = PTR_ERR(card);
 935                         goto err;
 936                 }
 937
 938                 card->ocr = ocr;
 939                 card->type = MMC_TYPE_MMC;
 940                 card->rca = 1;
 941                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 942         }
 943
 944         /*
 945          * For native busses:  set card RCA and quit open drain mode.
 946          */
 947         if (!mmc_host_is_spi(host)) {
 948                 err = mmc_set_relative_addr(card);
 949                 if (err)
 950                         goto free_card;
 951
 952                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 953         }
 954
 955         if (!oldcard) {
 956                 /*
 957                  * Fetch CSD from card.
 958                  */
 959                 err = mmc_send_csd(card, card->raw_csd);
 960                 if (err)
 961                         goto free_card;
 962
 963                 err = mmc_decode_csd(card);
 964                 if (err)
 965                         goto free_card;
 966                 err = mmc_decode_cid(card);
 967                 if (err)
 968                         goto free_card;
 969         }
 970
 971         /*
 972          * Select card, as all following commands rely on that.
 973          */
 974         if (!mmc_host_is_spi(host)) {
 975                 err = mmc_select_card(card);
 976                 if (err)
 977                         goto free_card;
 978         }
 979
 980         if (!oldcard) {
 981                 /*
 982                  * Fetch and process extended CSD.
 983                  */
 984
 985                 err = mmc_get_ext_csd(card, &ext_csd);
 986                 if (err)
 987                         goto free_card;
 988                 err = mmc_read_ext_csd(card, ext_csd);
 989                 if (err)
 990                         goto free_card;
 991
 992                 /* If doing byte addressing, check if required to do sector
 993                  * addressing.  Handle the case of <2GB cards needing sector
 994                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 995                  * ocr register has bit 30 set for sector addressing.
 996                  */
 997                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 998                         mmc_card_set_blockaddr(card);
 999
1000                 /* Erase size depends on CSD and Extended CSD */
1001                 mmc_set_erase_size(card);
1002         }
1003
1004         /*
1005          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
1006          * bit.  This bit will be lost every time after a reset or power off.
1007          */
1008         if (card->ext_csd.enhanced_area_en ||
1009             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
1010                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1011                                  EXT_CSD_ERASE_GROUP_DEF, 1,
1012                                  card->ext_csd.generic_cmd6_time);
1013
1014                 if (err && err != -EBADMSG)
1015                         goto free_card;
1016
1017                 if (err) {
1018                         err = 0;
1019                         /*
1020                          * Just disable enhanced area off & sz
1021                          * will try to enable ERASE_GROUP_DEF
1022                          * during next time reinit
1023                          */
1024                         card->ext_csd.enhanced_area_offset = -EINVAL;
1025                         card->ext_csd.enhanced_area_size = -EINVAL;
1026                 } else {
1027                         card->ext_csd.erase_group_def = 1;
1028                         /*
1029                          * enable ERASE_GRP_DEF successfully.
1030                          * This will affect the erase size, so
1031                          * here need to reset erase size
1032                          */
1033                         mmc_set_erase_size(card);
1034                 }
1035         }
1036
1037         /*
1038          * Ensure eMMC user default partition is enabled
1039          */
1040         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1041                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1042                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1043                                  card->ext_csd.part_config,
1044                                  card->ext_csd.part_time);
1045                 if (err && err != -EBADMSG)
1046                         goto free_card;
1047         }
1048
1049         /*
1050          * Enable power_off_notification byte in the ext_csd register
1051          */
1052         if (card->ext_csd.rev >= 6) {
1053                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1054                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1055                                  EXT_CSD_POWER_ON,
1056                                  card->ext_csd.generic_cmd6_time);
1057                 if (err && err != -EBADMSG)
1058                         goto free_card;
1059
1060                 /*
1061                  * The err can be -EBADMSG or 0,
1062                  * so check for success and update the flag
1063                  */
1064                 if (!err)
1065                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1066         }
1067
1068         /*
1069          * Activate high speed (if supported)
1070          */
1071         if (card->ext_csd.hs_max_dtr != 0) {
1072                 err = 0;
1073                 if (card->ext_csd.hs_max_dtr > 52000000 &&
1074                     host->caps2 & MMC_CAP2_HS200)
1075                         err = mmc_select_hs200(card);
1076                 else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
1077                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1078                                          EXT_CSD_HS_TIMING, 1,
1079                                          card->ext_csd.generic_cmd6_time);
1080
1081                 if (err && err != -EBADMSG)
1082                         goto free_card;
1083
1084                 if (err) {
1085                         pr_warning("%s: switch to highspeed failed\n",
1086                                mmc_hostname(card->host));
1087                         err = 0;
1088                 } else {
1089                         if (card->ext_csd.hs_max_dtr > 52000000 &&
1090                             host->caps2 & MMC_CAP2_HS200) {
1091                                 mmc_card_set_hs200(card);
1092                                 mmc_set_timing(card->host,
1093                                                MMC_TIMING_MMC_HS200);
1094                         } else {
1095                                 mmc_card_set_highspeed(card);
1096                                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1097                         }
1098                 }
1099         }
1100
1101         /*
1102          * Compute bus speed.
1103          */
1104         max_dtr = (unsigned int)-1;
1105
1106         if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
1107                 if (max_dtr > card->ext_csd.hs_max_dtr)
1108                         max_dtr = card->ext_csd.hs_max_dtr;
1109                 if (mmc_card_highspeed(card) && (max_dtr > 52000000))
1110                         max_dtr = 52000000;
1111         } else if (max_dtr > card->csd.max_dtr) {
1112                 max_dtr = card->csd.max_dtr;
1113         }
1114
1115         mmc_set_clock(host, max_dtr);
1116
1117         /*
1118          * Indicate DDR mode (if supported).
1119          */
1120         if (mmc_card_highspeed(card)) {
1121                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
1122                         && (host->caps & MMC_CAP_1_8V_DDR))
1123                                 ddr = MMC_1_8V_DDR_MODE;
1124                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1125                         && (host->caps & MMC_CAP_1_2V_DDR))
1126                                 ddr = MMC_1_2V_DDR_MODE;
1127         }
1128
1129         /*
1130          * Indicate HS200 SDR mode (if supported).
1131          */
1132         if (mmc_card_hs200(card)) {
1133                 u32 ext_csd_bits;
1134                 u32 bus_width = card->host->ios.bus_width;
1135
1136                 /*
1137                  * For devices supporting HS200 mode, the bus width has
1138                  * to be set before executing the tuning function. If
1139                  * set before tuning, then device will respond with CRC
1140                  * errors for responses on CMD line. So for HS200 the
1141                  * sequence will be
1142                  * 1. set bus width 4bit / 8 bit (1 bit not supported)
1143                  * 2. switch to HS200 mode
1144                  * 3. set the clock to > 52Mhz <=200MHz and
1145                  * 4. execute tuning for HS200
1146                  */
1147                 if ((host->caps2 & MMC_CAP2_HS200) &&
1148                     card->host->ops->execute_tuning) {
1149                         mmc_host_clk_hold(card->host);
1150                         err = card->host->ops->execute_tuning(card->host,
1151                                 MMC_SEND_TUNING_BLOCK_HS200);
1152                         mmc_host_clk_release(card->host);
1153                 }
1154                 if (err) {
1155                         pr_warning("%s: tuning execution failed\n",
1156                                    mmc_hostname(card->host));
1157                         goto err;
1158                 }
1159
1160                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1161                                 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
1162                 err = mmc_select_powerclass(card, ext_csd_bits);
1163                 if (err)
1164                         pr_warning("%s: power class selection to bus width %d"
1165                                    " failed\n", mmc_hostname(card->host),
1166                                    1 << bus_width);
1167         }
1168
1169         /*
1170          * Activate wide bus and DDR (if supported).
1171          */
1172         if (!mmc_card_hs200(card) &&
1173             (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
1174             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
1175                 static unsigned ext_csd_bits[][2] = {
1176                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
1177                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
1178                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
1179                 };
1180                 static unsigned bus_widths[] = {
1181                         MMC_BUS_WIDTH_8,
1182                         MMC_BUS_WIDTH_4,
1183                         MMC_BUS_WIDTH_1
1184                 };
1185                 unsigned idx, bus_width = 0;
1186
1187                 if (host->caps & MMC_CAP_8_BIT_DATA)
1188                         idx = 0;
1189                 else
1190                         idx = 1;
1191                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1192                         bus_width = bus_widths[idx];
1193                         if (bus_width == MMC_BUS_WIDTH_1)
1194                                 ddr = 0; /* no DDR for 1-bit width */
1195                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0]);
1196                         if (err)
1197                                 pr_warning("%s: power class selection to "
1198                                            "bus width %d failed\n",
1199                                            mmc_hostname(card->host),
1200                                            1 << bus_width);
1201
1202                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1203                                          EXT_CSD_BUS_WIDTH,
1204                                          ext_csd_bits[idx][0],
1205                                          card->ext_csd.generic_cmd6_time);
1206                         if (!err) {
1207                                 mmc_set_bus_width(card->host, bus_width);
1208
1209                                 /*
1210                                  * If controller can't handle bus width test,
1211                                  * compare ext_csd previously read in 1 bit mode
1212                                  * against ext_csd at new bus width
1213                                  */
1214                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1215                                         err = mmc_compare_ext_csds(card,
1216                                                 bus_width);
1217                                 else
1218                                         err = mmc_bus_test(card, bus_width);
1219                                 if (!err)
1220                                         break;
1221                         }
1222                 }
1223
1224                 if (!err && ddr) {
1225                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1]);
1226                         if (err)
1227                                 pr_warning("%s: power class selection to "
1228                                            "bus width %d ddr %d failed\n",
1229                                            mmc_hostname(card->host),
1230                                            1 << bus_width, ddr);
1231
1232                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1233                                          EXT_CSD_BUS_WIDTH,
1234                                          ext_csd_bits[idx][1],
1235                                          card->ext_csd.generic_cmd6_time);
1236                 }
1237                 if (err) {
1238                         pr_warning("%s: switch to bus width %d ddr %d "
1239                                 "failed\n", mmc_hostname(card->host),
1240                                 1 << bus_width, ddr);
1241                         goto free_card;
1242                 } else if (ddr) {
1243                         /*
1244                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1245                          * signaling.
1246                          *
1247                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1248                          *
1249                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1250                          * in the JEDEC spec for DDR.
1251                          *
1252                          * Do not force change in vccq since we are obviously
1253                          * working and no change to vccq is needed.
1254                          *
1255                          * WARNING: eMMC rules are NOT the same as SD DDR
1256                          */
1257                         if (ddr == MMC_1_2V_DDR_MODE) {
1258                                 err = __mmc_set_signal_voltage(host,
1259                                         MMC_SIGNAL_VOLTAGE_120);
1260                                 if (err)
1261                                         goto err;
1262                         }
1263                         mmc_card_set_ddr_mode(card);
1264                         mmc_set_timing(card->host, MMC_TIMING_MMC_DDR52);
1265                         mmc_set_bus_width(card->host, bus_width);
1266                 }
1267         }
1268
1269         /*
1270          * Enable HPI feature (if supported)
1271          */
1272         if (card->ext_csd.hpi) {
1273                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1274                                 EXT_CSD_HPI_MGMT, 1,
1275                                 card->ext_csd.generic_cmd6_time);
1276                 if (err && err != -EBADMSG)
1277                         goto free_card;
1278                 if (err) {
1279                         pr_warning("%s: Enabling HPI failed\n",
1280                                    mmc_hostname(card->host));
1281                         err = 0;
1282                 } else
1283                         card->ext_csd.hpi_en = 1;
1284         }
1285
1286         /*
1287          * If cache size is higher than 0, this indicates
1288          * the existence of cache and it can be turned on.
1289          */
1290         if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1291                         card->ext_csd.cache_size > 0) {
1292                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1293                                 EXT_CSD_CACHE_CTRL, 1,
1294                                 card->ext_csd.generic_cmd6_time);
1295                 if (err && err != -EBADMSG)
1296                         goto free_card;
1297
1298                 /*
1299                  * Only if no error, cache is turned on successfully.
1300                  */
1301                 if (err) {
1302                         pr_warning("%s: Cache is supported, "
1303                                         "but failed to turn on (%d)\n",
1304                                         mmc_hostname(card->host), err);
1305                         card->ext_csd.cache_ctrl = 0;
1306                         err = 0;
1307                 } else {
1308                         card->ext_csd.cache_ctrl = 1;
1309                 }
1310         }
1311
1312         /*
1313          * The mandatory minimum values are defined for packed command.
1314          * read: 5, write: 3
1315          */
1316         if (card->ext_csd.max_packed_writes >= 3 &&
1317             card->ext_csd.max_packed_reads >= 5 &&
1318             host->caps2 & MMC_CAP2_PACKED_CMD) {
1319                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1320                                 EXT_CSD_EXP_EVENTS_CTRL,
1321                                 EXT_CSD_PACKED_EVENT_EN,
1322                                 card->ext_csd.generic_cmd6_time);
1323                 if (err && err != -EBADMSG)
1324                         goto free_card;
1325                 if (err) {
1326                         pr_warn("%s: Enabling packed event failed\n",
1327                                 mmc_hostname(card->host));
1328                         card->ext_csd.packed_event_en = 0;
1329                         err = 0;
1330                 } else {
1331                         card->ext_csd.packed_event_en = 1;
1332                 }
1333         }
1334
1335         if (!oldcard)
1336                 host->card = card;
1337
1338         mmc_free_ext_csd(ext_csd);
1339         return 0;
1340
1341 free_card:
1342         if (!oldcard)
1343                 mmc_remove_card(card);
1344 err:
1345         mmc_free_ext_csd(ext_csd);
1346
1347         return err;
1348 }
1349
1350 static int mmc_can_sleep(struct mmc_card *card)
1351 {
1352         return (card && card->ext_csd.rev >= 3);
1353 }
1354
1355 static int mmc_sleep(struct mmc_host *host)
1356 {
1357         struct mmc_command cmd = {0};
1358         struct mmc_card *card = host->card;
1359         int err;
1360
1361         if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD)
1362                 return 0;
1363
1364         err = mmc_deselect_cards(host);
1365         if (err)
1366                 return err;
1367
1368         cmd.opcode = MMC_SLEEP_AWAKE;
1369         cmd.arg = card->rca << 16;
1370         cmd.arg |= 1 << 15;
1371
1372         cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1373         err = mmc_wait_for_cmd(host, &cmd, 0);
1374         if (err)
1375                 return err;
1376
1377         /*
1378          * If the host does not wait while the card signals busy, then we will
1379          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1380          * SEND_STATUS command to poll the status because that command (and most
1381          * others) is invalid while the card sleeps.
1382          */
1383         if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1384                 mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
1385
1386         return err;
1387 }
1388
1389 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1390 {
1391         return card &&
1392                 mmc_card_mmc(card) &&
1393                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1394 }
1395
1396 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1397 {
1398         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1399         int err;
1400
1401         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1402         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1403                 timeout = card->ext_csd.power_off_longtime;
1404
1405         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1406                         EXT_CSD_POWER_OFF_NOTIFICATION,
1407                         notify_type, timeout, true, false);
1408         if (err)
1409                 pr_err("%s: Power Off Notification timed out, %u\n",
1410                        mmc_hostname(card->host), timeout);
1411
1412         /* Disable the power off notification after the switch operation. */
1413         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1414
1415         return err;
1416 }
1417
1418 /*
1419  * Host is being removed. Free up the current card.
1420  */
1421 static void mmc_remove(struct mmc_host *host)
1422 {
1423         BUG_ON(!host);
1424         BUG_ON(!host->card);
1425
1426         mmc_remove_card(host->card);
1427         host->card = NULL;
1428 }
1429
1430 /*
1431  * Card detection - card is alive.
1432  */
1433 static int mmc_alive(struct mmc_host *host)
1434 {
1435         return mmc_send_status(host->card, NULL);
1436 }
1437
1438 /*
1439  * Card detection callback from host.
1440  */
1441 static void mmc_detect(struct mmc_host *host)
1442 {
1443         int err;
1444
1445         BUG_ON(!host);
1446         BUG_ON(!host->card);
1447
1448         mmc_get_card(host->card);
1449
1450         /*
1451          * Just check if our card has been removed.
1452          */
1453         err = _mmc_detect_card_removed(host);
1454
1455         mmc_put_card(host->card);
1456
1457         if (err) {
1458                 mmc_remove(host);
1459
1460                 mmc_claim_host(host);
1461                 mmc_detach_bus(host);
1462                 mmc_power_off(host);
1463                 mmc_release_host(host);
1464         }
1465 }
1466
1467 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
1468 {
1469         int err = 0;
1470         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
1471                                         EXT_CSD_POWER_OFF_LONG;
1472
1473         BUG_ON(!host);
1474         BUG_ON(!host->card);
1475
1476         mmc_claim_host(host);
1477
1478         if (mmc_card_suspended(host->card))
1479                 goto out;
1480
1481         if (mmc_card_doing_bkops(host->card)) {
1482                 err = mmc_stop_bkops(host->card);
1483                 if (err)
1484                         goto out;
1485         }
1486
1487         err = mmc_cache_ctrl(host, 0);
1488         if (err)
1489                 goto out;
1490
1491         if (mmc_can_poweroff_notify(host->card) &&
1492                 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
1493                 err = mmc_poweroff_notify(host->card, notify_type);
1494         else if (mmc_can_sleep(host->card))
1495                 err = mmc_sleep(host);
1496         else if (!mmc_host_is_spi(host))
1497                 err = mmc_deselect_cards(host);
1498         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1499
1500         if (!err) {
1501                 mmc_power_off(host);
1502                 mmc_card_set_suspended(host->card);
1503         }
1504 out:
1505         mmc_release_host(host);
1506         return err;
1507 }
1508
1509 /*
1510  * Suspend callback
1511  */
1512 static int mmc_suspend(struct mmc_host *host)
1513 {
1514         int err;
1515
1516         err = _mmc_suspend(host, true);
1517         if (!err) {
1518                 pm_runtime_disable(&host->card->dev);
1519                 pm_runtime_set_suspended(&host->card->dev);
1520         }
1521
1522         return err;
1523 }
1524
1525 /*
1526  * This function tries to determine if the same card is still present
1527  * and, if so, restore all state to it.
1528  */
1529 static int _mmc_resume(struct mmc_host *host)
1530 {
1531         int err = 0;
1532
1533         BUG_ON(!host);
1534         BUG_ON(!host->card);
1535
1536         mmc_claim_host(host);
1537
1538         if (!mmc_card_suspended(host->card))
1539                 goto out;
1540
1541         mmc_power_up(host, host->card->ocr);
1542         err = mmc_init_card(host, host->card->ocr, host->card);
1543         mmc_card_clr_suspended(host->card);
1544
1545 out:
1546         mmc_release_host(host);
1547         return err;
1548 }
1549
1550 /*
1551  * Shutdown callback
1552  */
1553 static int mmc_shutdown(struct mmc_host *host)
1554 {
1555         int err = 0;
1556
1557         /*
1558          * In a specific case for poweroff notify, we need to resume the card
1559          * before we can shutdown it properly.
1560          */
1561         if (mmc_can_poweroff_notify(host->card) &&
1562                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
1563                 err = _mmc_resume(host);
1564
1565         if (!err)
1566                 err = _mmc_suspend(host, false);
1567
1568         return err;
1569 }
1570
1571 /*
1572  * Callback for resume.
1573  */
1574 static int mmc_resume(struct mmc_host *host)
1575 {
1576         int err = 0;
1577
1578         if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1579                 err = _mmc_resume(host);
1580                 pm_runtime_set_active(&host->card->dev);
1581                 pm_runtime_mark_last_busy(&host->card->dev);
1582         }
1583         pm_runtime_enable(&host->card->dev);
1584
1585         return err;
1586 }
1587
1588 /*
1589  * Callback for runtime_suspend.
1590  */
1591 static int mmc_runtime_suspend(struct mmc_host *host)
1592 {
1593         int err;
1594
1595         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1596                 return 0;
1597
1598         err = _mmc_suspend(host, true);
1599         if (err)
1600                 pr_err("%s: error %d doing aggessive suspend\n",
1601                         mmc_hostname(host), err);
1602
1603         return err;
1604 }
1605
1606 /*
1607  * Callback for runtime_resume.
1608  */
1609 static int mmc_runtime_resume(struct mmc_host *host)
1610 {
1611         int err;
1612
1613         if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1614                 return 0;
1615
1616         err = _mmc_resume(host);
1617         if (err)
1618                 pr_err("%s: error %d doing aggessive resume\n",
1619                         mmc_hostname(host), err);
1620
1621         return 0;
1622 }
1623
1624 static int mmc_power_restore(struct mmc_host *host)
1625 {
1626         int ret;
1627
1628         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1629         mmc_claim_host(host);
1630         ret = mmc_init_card(host, host->card->ocr, host->card);
1631         mmc_release_host(host);
1632
1633         return ret;
1634 }
1635
1636 static const struct mmc_bus_ops mmc_ops = {
1637         .remove = mmc_remove,
1638         .detect = mmc_detect,
1639         .suspend = NULL,
1640         .resume = NULL,
1641         .power_restore = mmc_power_restore,
1642         .alive = mmc_alive,
1643         .shutdown = mmc_shutdown,
1644 };
1645
1646 static const struct mmc_bus_ops mmc_ops_unsafe = {
1647         .remove = mmc_remove,
1648         .detect = mmc_detect,
1649         .suspend = mmc_suspend,
1650         .resume = mmc_resume,
1651         .runtime_suspend = mmc_runtime_suspend,
1652         .runtime_resume = mmc_runtime_resume,
1653         .power_restore = mmc_power_restore,
1654         .alive = mmc_alive,
1655         .shutdown = mmc_shutdown,
1656 };
1657
1658 static void mmc_attach_bus_ops(struct mmc_host *host)
1659 {
1660         const struct mmc_bus_ops *bus_ops;
1661
1662         if (!mmc_card_is_removable(host))
1663                 bus_ops = &mmc_ops_unsafe;
1664         else
1665                 bus_ops = &mmc_ops;
1666         mmc_attach_bus(host, bus_ops);
1667 }
1668
1669 /*
1670  * Starting point for MMC card init.
1671  */
1672 int mmc_attach_mmc(struct mmc_host *host)
1673 {
1674         int err;
1675         u32 ocr, rocr;
1676
1677         BUG_ON(!host);
1678         WARN_ON(!host->claimed);
1679
1680         /* Set correct bus mode for MMC before attempting attach */
1681         if (!mmc_host_is_spi(host))
1682                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1683
1684         err = mmc_send_op_cond(host, 0, &ocr);
1685         if (err)
1686                 return err;
1687
1688         mmc_attach_bus_ops(host);
1689         if (host->ocr_avail_mmc)
1690                 host->ocr_avail = host->ocr_avail_mmc;
1691
1692         /*
1693          * We need to get OCR a different way for SPI.
1694          */
1695         if (mmc_host_is_spi(host)) {
1696                 err = mmc_spi_read_ocr(host, 1, &ocr);
1697                 if (err)
1698                         goto err;
1699         }
1700
1701         rocr = mmc_select_voltage(host, ocr);
1702
1703         /*
1704          * Can we support the voltage of the card?
1705          */
1706         if (!rocr) {
1707                 err = -EINVAL;
1708                 goto err;
1709         }
1710
1711         /*
1712          * Detect and init the card.
1713          */
1714         err = mmc_init_card(host, rocr, NULL);
1715         if (err)
1716                 goto err;
1717
1718         mmc_release_host(host);
1719         err = mmc_add_card(host->card);
1720         mmc_claim_host(host);
1721         if (err)
1722                 goto remove_card;
1723
1724         return 0;
1725
1726 remove_card:
1727         mmc_release_host(host);
1728         mmc_remove_card(host->card);
1729         mmc_claim_host(host);
1730         host->card = NULL;
1731 err:
1732         mmc_detach_bus(host);
1733
1734         pr_err("%s: error %d whilst initialising MMC card\n",
1735                 mmc_hostname(host), err);
1736
1737         return err;
1738 }