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,
 861                                 card->ext_csd.generic_cmd6_time,
 862                                 true, true, true);
 863 err:
 864         return err;
 865 }
 866
 867 /*
 868  * Handle the detection and initialisation of a card.
 869  *
 870  * In the case of a resume, "oldcard" will contain the card
 871  * we're trying to reinitialise.
 872  */
 873 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 874         struct mmc_card *oldcard)
 875 {
 876         struct mmc_card *card;
 877         int err, ddr = 0;
 878         u32 cid[4];
 879         unsigned int max_dtr;
 880         u32 rocr;
 881         u8 *ext_csd = NULL;
 882
 883         BUG_ON(!host);
 884         WARN_ON(!host->claimed);
 885
 886         /* Set correct bus mode for MMC before attempting init */
 887         if (!mmc_host_is_spi(host))
 888                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 889
 890         /*
 891          * Since we're changing the OCR value, we seem to
 892          * need to tell some cards to go back to the idle
 893          * state.  We wait 1ms to give cards time to
 894          * respond.
 895          * mmc_go_idle is needed for eMMC that are asleep
 896          */
 897         mmc_go_idle(host);
 898
 899         /* The extra bit indicates that we support high capacity */
 900         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 901         if (err)
 902                 goto err;
 903
 904         /*
 905          * For SPI, enable CRC as appropriate.
 906          */
 907         if (mmc_host_is_spi(host)) {
 908                 err = mmc_spi_set_crc(host, use_spi_crc);
 909                 if (err)
 910                         goto err;
 911         }
 912
 913         /*
 914          * Fetch CID from card.
 915          */
 916         if (mmc_host_is_spi(host))
 917                 err = mmc_send_cid(host, cid);
 918         else
 919                 err = mmc_all_send_cid(host, cid);
 920         if (err)
 921                 goto err;
 922
 923         if (oldcard) {
 924                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 925                         err = -ENOENT;
 926                         goto err;
 927                 }
 928
 929                 card = oldcard;
 930         } else {
 931                 /*
 932                  * Allocate card structure.
 933                  */
 934                 card = mmc_alloc_card(host, &mmc_type);
 935                 if (IS_ERR(card)) {
 936                         err = PTR_ERR(card);
 937                         goto err;
 938                 }
 939
 940                 card->ocr = ocr;
 941                 card->type = MMC_TYPE_MMC;
 942                 card->rca = 1;
 943                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 944         }
 945
 946         /*
 947          * For native busses:  set card RCA and quit open drain mode.
 948          */
 949         if (!mmc_host_is_spi(host)) {
 950                 err = mmc_set_relative_addr(card);
 951                 if (err)
 952                         goto free_card;
 953
 954                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 955         }
 956
 957         if (!oldcard) {
 958                 /*
 959                  * Fetch CSD from card.
 960                  */
 961                 err = mmc_send_csd(card, card->raw_csd);
 962                 if (err)
 963                         goto free_card;
 964
 965                 err = mmc_decode_csd(card);
 966                 if (err)
 967                         goto free_card;
 968                 err = mmc_decode_cid(card);
 969                 if (err)
 970                         goto free_card;
 971         }
 972
 973         /*
 974          * Select card, as all following commands rely on that.
 975          */
 976         if (!mmc_host_is_spi(host)) {
 977                 err = mmc_select_card(card);
 978                 if (err)
 979                         goto free_card;
 980         }
 981
 982         if (!oldcard) {
 983                 /*
 984                  * Fetch and process extended CSD.
 985                  */
 986
 987                 err = mmc_get_ext_csd(card, &ext_csd);
 988                 if (err)
 989                         goto free_card;
 990                 err = mmc_read_ext_csd(card, ext_csd);
 991                 if (err)
 992                         goto free_card;
 993
 994                 /* If doing byte addressing, check if required to do sector
 995                  * addressing.  Handle the case of <2GB cards needing sector
 996                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 997                  * ocr register has bit 30 set for sector addressing.
 998                  */
 999                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
1000                         mmc_card_set_blockaddr(card);
1001
1002                 /* Erase size depends on CSD and Extended CSD */
1003                 mmc_set_erase_size(card);
1004         }
1005
1006         /*
1007          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
1008          * bit.  This bit will be lost every time after a reset or power off.
1009          */
1010         if (card->ext_csd.enhanced_area_en ||
1011             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
1012                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1013                                  EXT_CSD_ERASE_GROUP_DEF, 1,
1014                                  card->ext_csd.generic_cmd6_time);
1015
1016                 if (err && err != -EBADMSG)
1017                         goto free_card;
1018
1019                 if (err) {
1020                         err = 0;
1021                         /*
1022                          * Just disable enhanced area off & sz
1023                          * will try to enable ERASE_GROUP_DEF
1024                          * during next time reinit
1025                          */
1026                         card->ext_csd.enhanced_area_offset = -EINVAL;
1027                         card->ext_csd.enhanced_area_size = -EINVAL;
1028                 } else {
1029                         card->ext_csd.erase_group_def = 1;
1030                         /*
1031                          * enable ERASE_GRP_DEF successfully.
1032                          * This will affect the erase size, so
1033                          * here need to reset erase size
1034                          */
1035                         mmc_set_erase_size(card);
1036                 }
1037         }
1038
1039         /*
1040          * Ensure eMMC user default partition is enabled
1041          */
1042         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1043                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1044                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1045                                  card->ext_csd.part_config,
1046                                  card->ext_csd.part_time);
1047                 if (err && err != -EBADMSG)
1048                         goto free_card;
1049         }
1050
1051         /*
1052          * Enable power_off_notification byte in the ext_csd register
1053          */
1054         if (card->ext_csd.rev >= 6) {
1055                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1056                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1057                                  EXT_CSD_POWER_ON,
1058                                  card->ext_csd.generic_cmd6_time);
1059                 if (err && err != -EBADMSG)
1060                         goto free_card;
1061
1062                 /*
1063                  * The err can be -EBADMSG or 0,
1064                  * so check for success and update the flag
1065                  */
1066                 if (!err)
1067                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1068         }
1069
1070         /*
1071          * Activate high speed (if supported)
1072          */
1073         if (card->ext_csd.hs_max_dtr != 0) {
1074                 err = 0;
1075                 if (card->ext_csd.hs_max_dtr > 52000000 &&
1076                     host->caps2 & MMC_CAP2_HS200)
1077                         err = mmc_select_hs200(card);
1078                 else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
1079                         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1080                                         EXT_CSD_HS_TIMING, 1,
1081                                         card->ext_csd.generic_cmd6_time,
1082                                         true, true, true);
1083
1084                 if (err && err != -EBADMSG)
1085                         goto free_card;
1086
1087                 if (err) {
1088                         pr_warning("%s: switch to highspeed failed\n",
1089                                mmc_hostname(card->host));
1090                         err = 0;
1091                 } else {
1092                         if (card->ext_csd.hs_max_dtr > 52000000 &&
1093                             host->caps2 & MMC_CAP2_HS200) {
1094                                 mmc_card_set_hs200(card);
1095                                 mmc_set_timing(card->host,
1096                                                MMC_TIMING_MMC_HS200);
1097                         } else {
1098                                 mmc_card_set_highspeed(card);
1099                                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1100                         }
1101                 }
1102         }
1103
1104         /*
1105          * Compute bus speed.
1106          */
1107         max_dtr = (unsigned int)-1;
1108
1109         if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
1110                 if (max_dtr > card->ext_csd.hs_max_dtr)
1111                         max_dtr = card->ext_csd.hs_max_dtr;
1112                 if (mmc_card_highspeed(card) && (max_dtr > 52000000))
1113                         max_dtr = 52000000;
1114         } else if (max_dtr > card->csd.max_dtr) {
1115                 max_dtr = card->csd.max_dtr;
1116         }
1117
1118         mmc_set_clock(host, max_dtr);
1119
1120         /*
1121          * Indicate DDR mode (if supported).
1122          */
1123         if (mmc_card_highspeed(card)) {
1124                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
1125                         && (host->caps & MMC_CAP_1_8V_DDR))
1126                                 ddr = MMC_1_8V_DDR_MODE;
1127                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1128                         && (host->caps & MMC_CAP_1_2V_DDR))
1129                                 ddr = MMC_1_2V_DDR_MODE;
1130         }
1131
1132         /*
1133          * Indicate HS200 SDR mode (if supported).
1134          */
1135         if (mmc_card_hs200(card)) {
1136                 u32 ext_csd_bits;
1137                 u32 bus_width = card->host->ios.bus_width;
1138
1139                 /*
1140                  * For devices supporting HS200 mode, the bus width has
1141                  * to be set before executing the tuning function. If
1142                  * set before tuning, then device will respond with CRC
1143                  * errors for responses on CMD line. So for HS200 the
1144                  * sequence will be
1145                  * 1. set bus width 4bit / 8 bit (1 bit not supported)
1146                  * 2. switch to HS200 mode
1147                  * 3. set the clock to > 52Mhz <=200MHz and
1148                  * 4. execute tuning for HS200
1149                  */
1150                 if ((host->caps2 & MMC_CAP2_HS200) &&
1151                     card->host->ops->execute_tuning) {
1152                         mmc_host_clk_hold(card->host);
1153                         err = card->host->ops->execute_tuning(card->host,
1154                                 MMC_SEND_TUNING_BLOCK_HS200);
1155                         mmc_host_clk_release(card->host);
1156                 }
1157                 if (err) {
1158                         pr_warning("%s: tuning execution failed\n",
1159                                    mmc_hostname(card->host));
1160                         goto err;
1161                 }
1162
1163                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1164                                 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
1165                 err = mmc_select_powerclass(card, ext_csd_bits);
1166                 if (err)
1167                         pr_warning("%s: power class selection to bus width %d"
1168                                    " failed\n", mmc_hostname(card->host),
1169                                    1 << bus_width);
1170         }
1171
1172         /*
1173          * Activate wide bus and DDR (if supported).
1174          */
1175         if (!mmc_card_hs200(card) &&
1176             (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
1177             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
1178                 static unsigned ext_csd_bits[][2] = {
1179                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
1180                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
1181                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
1182                 };
1183                 static unsigned bus_widths[] = {
1184                         MMC_BUS_WIDTH_8,
1185                         MMC_BUS_WIDTH_4,
1186                         MMC_BUS_WIDTH_1
1187                 };
1188                 unsigned idx, bus_width = 0;
1189
1190                 if (host->caps & MMC_CAP_8_BIT_DATA)
1191                         idx = 0;
1192                 else
1193                         idx = 1;
1194                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1195                         bus_width = bus_widths[idx];
1196                         if (bus_width == MMC_BUS_WIDTH_1)
1197                                 ddr = 0; /* no DDR for 1-bit width */
1198                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0]);
1199                         if (err)
1200                                 pr_warning("%s: power class selection to "
1201                                            "bus width %d failed\n",
1202                                            mmc_hostname(card->host),
1203                                            1 << bus_width);
1204
1205                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1206                                          EXT_CSD_BUS_WIDTH,
1207                                          ext_csd_bits[idx][0],
1208                                          card->ext_csd.generic_cmd6_time);
1209                         if (!err) {
1210                                 mmc_set_bus_width(card->host, bus_width);
1211
1212                                 /*
1213                                  * If controller can't handle bus width test,
1214                                  * compare ext_csd previously read in 1 bit mode
1215                                  * against ext_csd at new bus width
1216                                  */
1217                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1218                                         err = mmc_compare_ext_csds(card,
1219                                                 bus_width);
1220                                 else
1221                                         err = mmc_bus_test(card, bus_width);
1222                                 if (!err)
1223                                         break;
1224                         }
1225                 }
1226
1227                 if (!err && ddr) {
1228                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1]);
1229                         if (err)
1230                                 pr_warning("%s: power class selection to "
1231                                            "bus width %d ddr %d failed\n",
1232                                            mmc_hostname(card->host),
1233                                            1 << bus_width, ddr);
1234
1235                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1236                                          EXT_CSD_BUS_WIDTH,
1237                                          ext_csd_bits[idx][1],
1238                                          card->ext_csd.generic_cmd6_time);
1239                 }
1240                 if (err) {
1241                         pr_warning("%s: switch to bus width %d ddr %d "
1242                                 "failed\n", mmc_hostname(card->host),
1243                                 1 << bus_width, ddr);
1244                         goto free_card;
1245                 } else if (ddr) {
1246                         /*
1247                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1248                          * signaling.
1249                          *
1250                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1251                          *
1252                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1253                          * in the JEDEC spec for DDR.
1254                          *
1255                          * Do not force change in vccq since we are obviously
1256                          * working and no change to vccq is needed.
1257                          *
1258                          * WARNING: eMMC rules are NOT the same as SD DDR
1259                          */
1260                         if (ddr == MMC_1_2V_DDR_MODE) {
1261                                 err = __mmc_set_signal_voltage(host,
1262                                         MMC_SIGNAL_VOLTAGE_120);
1263                                 if (err)
1264                                         goto err;
1265                         }
1266                         mmc_card_set_ddr_mode(card);
1267                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1268                         mmc_set_bus_width(card->host, bus_width);
1269                 }
1270         }
1271
1272         /*
1273          * Enable HPI feature (if supported)
1274          */
1275         if (card->ext_csd.hpi) {
1276                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1277                                 EXT_CSD_HPI_MGMT, 1,
1278                                 card->ext_csd.generic_cmd6_time);
1279                 if (err && err != -EBADMSG)
1280                         goto free_card;
1281                 if (err) {
1282                         pr_warning("%s: Enabling HPI failed\n",
1283                                    mmc_hostname(card->host));
1284                         err = 0;
1285                 } else
1286                         card->ext_csd.hpi_en = 1;
1287         }
1288
1289         /*
1290          * If cache size is higher than 0, this indicates
1291          * the existence of cache and it can be turned on.
1292          */
1293         if (card->ext_csd.cache_size > 0) {
1294                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1295                                 EXT_CSD_CACHE_CTRL, 1,
1296                                 card->ext_csd.generic_cmd6_time);
1297                 if (err && err != -EBADMSG)
1298                         goto free_card;
1299
1300                 /*
1301                  * Only if no error, cache is turned on successfully.
1302                  */
1303                 if (err) {
1304                         pr_warning("%s: Cache is supported, "
1305                                         "but failed to turn on (%d)\n",
1306                                         mmc_hostname(card->host), err);
1307                         card->ext_csd.cache_ctrl = 0;
1308                         err = 0;
1309                 } else {
1310                         card->ext_csd.cache_ctrl = 1;
1311                 }
1312         }
1313
1314         /*
1315          * The mandatory minimum values are defined for packed command.
1316          * read: 5, write: 3
1317          */
1318         if (card->ext_csd.max_packed_writes >= 3 &&
1319             card->ext_csd.max_packed_reads >= 5 &&
1320             host->caps2 & MMC_CAP2_PACKED_CMD) {
1321                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1322                                 EXT_CSD_EXP_EVENTS_CTRL,
1323                                 EXT_CSD_PACKED_EVENT_EN,
1324                                 card->ext_csd.generic_cmd6_time);
1325                 if (err && err != -EBADMSG)
1326                         goto free_card;
1327                 if (err) {
1328                         pr_warn("%s: Enabling packed event failed\n",
1329                                 mmc_hostname(card->host));
1330                         card->ext_csd.packed_event_en = 0;
1331                         err = 0;
1332                 } else {
1333                         card->ext_csd.packed_event_en = 1;
1334                 }
1335         }
1336
1337         if (!oldcard)
1338                 host->card = card;
1339
1340         mmc_free_ext_csd(ext_csd);
1341         return 0;
1342
1343 free_card:
1344         if (!oldcard)
1345                 mmc_remove_card(card);
1346 err:
1347         mmc_free_ext_csd(ext_csd);
1348
1349         return err;
1350 }
1351
1352 static int mmc_can_sleep(struct mmc_card *card)
1353 {
1354         return (card && card->ext_csd.rev >= 3);
1355 }
1356
1357 static int mmc_sleep(struct mmc_host *host)
1358 {
1359         struct mmc_command cmd = {0};
1360         struct mmc_card *card = host->card;
1361         unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1362         int err;
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         /*
1373          * If the max_busy_timeout of the host is specified, validate it against
1374          * the sleep cmd timeout. A failure means we need to prevent the host
1375          * from doing hw busy detection, which is done by converting to a R1
1376          * response instead of a R1B.
1377          */
1378         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
1379                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1380         } else {
1381                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1382                 cmd.busy_timeout = timeout_ms;
1383         }
1384
1385         err = mmc_wait_for_cmd(host, &cmd, 0);
1386         if (err)
1387                 return err;
1388
1389         /*
1390          * If the host does not wait while the card signals busy, then we will
1391          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1392          * SEND_STATUS command to poll the status because that command (and most
1393          * others) is invalid while the card sleeps.
1394          */
1395         if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1396                 mmc_delay(timeout_ms);
1397
1398         return err;
1399 }
1400
1401 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1402 {
1403         return card &&
1404                 mmc_card_mmc(card) &&
1405                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1406 }
1407
1408 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1409 {
1410         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1411         int err;
1412
1413         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1414         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1415                 timeout = card->ext_csd.power_off_longtime;
1416
1417         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1418                         EXT_CSD_POWER_OFF_NOTIFICATION,
1419                         notify_type, timeout, true, false, false);
1420         if (err)
1421                 pr_err("%s: Power Off Notification timed out, %u\n",
1422                        mmc_hostname(card->host), timeout);
1423
1424         /* Disable the power off notification after the switch operation. */
1425         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1426
1427         return err;
1428 }
1429
1430 /*
1431  * Host is being removed. Free up the current card.
1432  */
1433 static void mmc_remove(struct mmc_host *host)
1434 {
1435         BUG_ON(!host);
1436         BUG_ON(!host->card);
1437
1438         mmc_remove_card(host->card);
1439         host->card = NULL;
1440 }
1441
1442 /*
1443  * Card detection - card is alive.
1444  */
1445 static int mmc_alive(struct mmc_host *host)
1446 {
1447         return mmc_send_status(host->card, NULL);
1448 }
1449
1450 /*
1451  * Card detection callback from host.
1452  */
1453 static void mmc_detect(struct mmc_host *host)
1454 {
1455         int err;
1456
1457         BUG_ON(!host);
1458         BUG_ON(!host->card);
1459
1460         mmc_get_card(host->card);
1461
1462         /*
1463          * Just check if our card has been removed.
1464          */
1465         err = _mmc_detect_card_removed(host);
1466
1467         mmc_put_card(host->card);
1468
1469         if (err) {
1470                 mmc_remove(host);
1471
1472                 mmc_claim_host(host);
1473                 mmc_detach_bus(host);
1474                 mmc_power_off(host);
1475                 mmc_release_host(host);
1476         }
1477 }
1478
1479 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
1480 {
1481         int err = 0;
1482         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
1483                                         EXT_CSD_POWER_OFF_LONG;
1484
1485         BUG_ON(!host);
1486         BUG_ON(!host->card);
1487
1488         mmc_claim_host(host);
1489
1490         if (mmc_card_suspended(host->card))
1491                 goto out;
1492
1493         if (mmc_card_doing_bkops(host->card)) {
1494                 err = mmc_stop_bkops(host->card);
1495                 if (err)
1496                         goto out;
1497         }
1498
1499         err = mmc_flush_cache(host->card);
1500         if (err)
1501                 goto out;
1502
1503         if (mmc_can_poweroff_notify(host->card) &&
1504                 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
1505                 err = mmc_poweroff_notify(host->card, notify_type);
1506         else if (mmc_can_sleep(host->card))
1507                 err = mmc_sleep(host);
1508         else if (!mmc_host_is_spi(host))
1509                 err = mmc_deselect_cards(host);
1510         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1511
1512         if (!err) {
1513                 mmc_power_off(host);
1514                 mmc_card_set_suspended(host->card);
1515         }
1516 out:
1517         mmc_release_host(host);
1518         return err;
1519 }
1520
1521 /*
1522  * Suspend callback
1523  */
1524 static int mmc_suspend(struct mmc_host *host)
1525 {
1526         int err;
1527
1528         err = _mmc_suspend(host, true);
1529         if (!err) {
1530                 pm_runtime_disable(&host->card->dev);
1531                 pm_runtime_set_suspended(&host->card->dev);
1532         }
1533
1534         return err;
1535 }
1536
1537 /*
1538  * This function tries to determine if the same card is still present
1539  * and, if so, restore all state to it.
1540  */
1541 static int _mmc_resume(struct mmc_host *host)
1542 {
1543         int err = 0;
1544
1545         BUG_ON(!host);
1546         BUG_ON(!host->card);
1547
1548         mmc_claim_host(host);
1549
1550         if (!mmc_card_suspended(host->card))
1551                 goto out;
1552
1553         mmc_power_up(host, host->card->ocr);
1554         err = mmc_init_card(host, host->card->ocr, host->card);
1555         mmc_card_clr_suspended(host->card);
1556
1557 out:
1558         mmc_release_host(host);
1559         return err;
1560 }
1561
1562 /*
1563  * Shutdown callback
1564  */
1565 static int mmc_shutdown(struct mmc_host *host)
1566 {
1567         int err = 0;
1568
1569         /*
1570          * In a specific case for poweroff notify, we need to resume the card
1571          * before we can shutdown it properly.
1572          */
1573         if (mmc_can_poweroff_notify(host->card) &&
1574                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
1575                 err = _mmc_resume(host);
1576
1577         if (!err)
1578                 err = _mmc_suspend(host, false);
1579
1580         return err;
1581 }
1582
1583 /*
1584  * Callback for resume.
1585  */
1586 static int mmc_resume(struct mmc_host *host)
1587 {
1588         int err = 0;
1589
1590         if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1591                 err = _mmc_resume(host);
1592                 pm_runtime_set_active(&host->card->dev);
1593                 pm_runtime_mark_last_busy(&host->card->dev);
1594         }
1595         pm_runtime_enable(&host->card->dev);
1596
1597         return err;
1598 }
1599
1600 /*
1601  * Callback for runtime_suspend.
1602  */
1603 static int mmc_runtime_suspend(struct mmc_host *host)
1604 {
1605         int err;
1606
1607         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1608                 return 0;
1609
1610         err = _mmc_suspend(host, true);
1611         if (err)
1612                 pr_err("%s: error %d doing aggessive suspend\n",
1613                         mmc_hostname(host), err);
1614
1615         return err;
1616 }
1617
1618 /*
1619  * Callback for runtime_resume.
1620  */
1621 static int mmc_runtime_resume(struct mmc_host *host)
1622 {
1623         int err;
1624
1625         if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1626                 return 0;
1627
1628         err = _mmc_resume(host);
1629         if (err)
1630                 pr_err("%s: error %d doing aggessive resume\n",
1631                         mmc_hostname(host), err);
1632
1633         return 0;
1634 }
1635
1636 static int mmc_power_restore(struct mmc_host *host)
1637 {
1638         int ret;
1639
1640         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1641         mmc_claim_host(host);
1642         ret = mmc_init_card(host, host->card->ocr, host->card);
1643         mmc_release_host(host);
1644
1645         return ret;
1646 }
1647
1648 static const struct mmc_bus_ops mmc_ops = {
1649         .remove = mmc_remove,
1650         .detect = mmc_detect,
1651         .suspend = mmc_suspend,
1652         .resume = mmc_resume,
1653         .runtime_suspend = mmc_runtime_suspend,
1654         .runtime_resume = mmc_runtime_resume,
1655         .power_restore = mmc_power_restore,
1656         .alive = mmc_alive,
1657         .shutdown = mmc_shutdown,
1658 };
1659
1660 /*
1661  * Starting point for MMC card init.
1662  */
1663 int mmc_attach_mmc(struct mmc_host *host)
1664 {
1665         int err;
1666         u32 ocr, rocr;
1667
1668         BUG_ON(!host);
1669         WARN_ON(!host->claimed);
1670
1671         /* Set correct bus mode for MMC before attempting attach */
1672         if (!mmc_host_is_spi(host))
1673                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1674
1675         err = mmc_send_op_cond(host, 0, &ocr);
1676         if (err)
1677                 return err;
1678
1679         mmc_attach_bus(host, &mmc_ops);
1680         if (host->ocr_avail_mmc)
1681                 host->ocr_avail = host->ocr_avail_mmc;
1682
1683         /*
1684          * We need to get OCR a different way for SPI.
1685          */
1686         if (mmc_host_is_spi(host)) {
1687                 err = mmc_spi_read_ocr(host, 1, &ocr);
1688                 if (err)
1689                         goto err;
1690         }
1691
1692         rocr = mmc_select_voltage(host, ocr);
1693
1694         /*
1695          * Can we support the voltage of the card?
1696          */
1697         if (!rocr) {
1698                 err = -EINVAL;
1699                 goto err;
1700         }
1701
1702         /*
1703          * Detect and init the card.
1704          */
1705         err = mmc_init_card(host, rocr, NULL);
1706         if (err)
1707                 goto err;
1708
1709         mmc_release_host(host);
1710         err = mmc_add_card(host->card);
1711         mmc_claim_host(host);
1712         if (err)
1713                 goto remove_card;
1714
1715         return 0;
1716
1717 remove_card:
1718         mmc_release_host(host);
1719         mmc_remove_card(host->card);
1720         mmc_claim_host(host);
1721         host->card = NULL;
1722 err:
1723         mmc_detach_bus(host);
1724
1725         pr_err("%s: error %d whilst initialising MMC card\n",
1726                 mmc_hostname(host), err);
1727
1728         return err;
1729 }