drivers/mmc/core/mmc.c

   1 /*
   2  *  linux/drivers/mmc/core/mmc.c
   3  *
   4  *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
   5  *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
   6  *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/slab.h>
  15 #include <linux/stat.h>
  16
  17 #include <linux/mmc/host.h>
  18 #include <linux/mmc/card.h>
  19 #include <linux/mmc/mmc.h>
  20
  21 #include "core.h"
  22 #include "bus.h"
  23 #include "mmc_ops.h"
  24 #include "sd_ops.h"
  25
  26 static const unsigned int tran_exp[] = {
  27         10000,          100000,         1000000,        10000000,
  28         0,              0,              0,              0
  29 };
  30
  31 static const unsigned char tran_mant[] = {
  32         0,      10,     12,     13,     15,     20,     25,     30,
  33         35,     40,     45,     50,     55,     60,     70,     80,
  34 };
  35
  36 static const unsigned int tacc_exp[] = {
  37         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  38 };
  39
  40 static const unsigned int tacc_mant[] = {
  41         0,      10,     12,     13,     15,     20,     25,     30,
  42         35,     40,     45,     50,     55,     60,     70,     80,
  43 };
  44
  45 #define UNSTUFF_BITS(resp,start,size)                                   \
  46         ({                                                              \
  47                 const int __size = size;                                \
  48                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  49                 const int __off = 3 - ((start) / 32);                   \
  50                 const int __shft = (start) & 31;                        \
  51                 u32 __res;                                              \
  52                                                                         \
  53                 __res = resp[__off] >> __shft;                          \
  54                 if (__size + __shft > 32)                               \
  55                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  56                 __res & __mask;                                         \
  57         })
  58
  59 /*
  60  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  61  */
  62 static int mmc_decode_cid(struct mmc_card *card)
  63 {
  64         u32 *resp = card->raw_cid;
  65
  66         /*
  67          * The selection of the format here is based upon published
  68          * specs from sandisk and from what people have reported.
  69          */
  70         switch (card->csd.mmca_vsn) {
  71         case 0: /* MMC v1.0 - v1.2 */
  72         case 1: /* MMC v1.4 */
  73                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  74                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  75                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  76                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  77                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  78                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  79                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  80                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  81                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  82                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  83                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  84                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  85                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  86                 break;
  87
  88         case 2: /* MMC v2.0 - v2.2 */
  89         case 3: /* MMC v3.1 - v3.3 */
  90         case 4: /* MMC v4 */
  91                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
  92                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
  93                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  94                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  95                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  96                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  97                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  98                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  99                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 100                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 101                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 102                 break;
 103
 104         default:
 105                 pr_err("%s: card has unknown MMCA version %d\n",
 106                         mmc_hostname(card->host), card->csd.mmca_vsn);
 107                 return -EINVAL;
 108         }
 109
 110         return 0;
 111 }
 112
 113 static void mmc_set_erase_size(struct mmc_card *card)
 114 {
 115         if (card->ext_csd.erase_group_def & 1)
 116                 card->erase_size = card->ext_csd.hc_erase_size;
 117         else
 118                 card->erase_size = card->csd.erase_size;
 119
 120         mmc_init_erase(card);
 121 }
 122
 123 /*
 124  * Given a 128-bit response, decode to our card CSD structure.
 125  */
 126 static int mmc_decode_csd(struct mmc_card *card)
 127 {
 128         struct mmc_csd *csd = &card->csd;
 129         unsigned int e, m, a, b;
 130         u32 *resp = card->raw_csd;
 131
 132         /*
 133          * We only understand CSD structure v1.1 and v1.2.
 134          * v1.2 has extra information in bits 15, 11 and 10.
 135          * We also support eMMC v4.4 & v4.41.
 136          */
 137         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 138         if (csd->structure == 0) {
 139                 pr_err("%s: unrecognised CSD structure version %d\n",
 140                         mmc_hostname(card->host), csd->structure);
 141                 return -EINVAL;
 142         }
 143
 144         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 145         m = UNSTUFF_BITS(resp, 115, 4);
 146         e = UNSTUFF_BITS(resp, 112, 3);
 147         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 148         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 149
 150         m = UNSTUFF_BITS(resp, 99, 4);
 151         e = UNSTUFF_BITS(resp, 96, 3);
 152         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 153         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 154
 155         e = UNSTUFF_BITS(resp, 47, 3);
 156         m = UNSTUFF_BITS(resp, 62, 12);
 157         csd->capacity     = (1 + m) << (e + 2);
 158
 159         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 160         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 161         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 162         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 163         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 164         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 165         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 166
 167         if (csd->write_blkbits >= 9) {
 168                 a = UNSTUFF_BITS(resp, 42, 5);
 169                 b = UNSTUFF_BITS(resp, 37, 5);
 170                 csd->erase_size = (a + 1) * (b + 1);
 171                 csd->erase_size <<= csd->write_blkbits - 9;
 172         }
 173
 174         return 0;
 175 }
 176
 177 /*
 178  * Read extended CSD.
 179  */
 180 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
 181 {
 182         int err;
 183         u8 *ext_csd;
 184
 185         BUG_ON(!card);
 186         BUG_ON(!new_ext_csd);
 187
 188         *new_ext_csd = NULL;
 189
 190         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 191                 return 0;
 192
 193         /*
 194          * As the ext_csd is so large and mostly unused, we don't store the
 195          * raw block in mmc_card.
 196          */
 197         ext_csd = kmalloc(512, GFP_KERNEL);
 198         if (!ext_csd) {
 199                 pr_err("%s: could not allocate a buffer to "
 200                         "receive the ext_csd.\n", mmc_hostname(card->host));
 201                 return -ENOMEM;
 202         }
 203
 204         err = mmc_send_ext_csd(card, ext_csd);
 205         if (err) {
 206                 kfree(ext_csd);
 207                 *new_ext_csd = NULL;
 208
 209                 /* If the host or the card can't do the switch,
 210                  * fail more gracefully. */
 211                 if ((err != -EINVAL)
 212                  && (err != -ENOSYS)
 213                  && (err != -EFAULT))
 214                         return err;
 215
 216                 /*
 217                  * High capacity cards should have this "magic" size
 218                  * stored in their CSD.
 219                  */
 220                 if (card->csd.capacity == (4096 * 512)) {
 221                         pr_err("%s: unable to read EXT_CSD "
 222                                 "on a possible high capacity card. "
 223                                 "Card will be ignored.\n",
 224                                 mmc_hostname(card->host));
 225                 } else {
 226                         pr_warning("%s: unable to read "
 227                                 "EXT_CSD, performance might "
 228                                 "suffer.\n",
 229                                 mmc_hostname(card->host));
 230                         err = 0;
 231                 }
 232         } else
 233                 *new_ext_csd = ext_csd;
 234
 235         return err;
 236 }
 237
 238 /*
 239  * Decode extended CSD.
 240  */
 241 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 242 {
 243         int err = 0, idx;
 244         unsigned int part_size;
 245         u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
 246
 247         BUG_ON(!card);
 248
 249         if (!ext_csd)
 250                 return 0;
 251
 252         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 253         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 254         if (card->csd.structure == 3) {
 255                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 256                         pr_err("%s: unrecognised EXT_CSD structure "
 257                                 "version %d\n", mmc_hostname(card->host),
 258                                         card->ext_csd.raw_ext_csd_structure);
 259                         err = -EINVAL;
 260                         goto out;
 261                 }
 262         }
 263
 264         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 265         if (card->ext_csd.rev > 6) {
 266                 pr_err("%s: unrecognised EXT_CSD revision %d\n",
 267                         mmc_hostname(card->host), card->ext_csd.rev);
 268                 err = -EINVAL;
 269                 goto out;
 270         }
 271
 272         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 273         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 274         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 275         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 276         if (card->ext_csd.rev >= 2) {
 277                 card->ext_csd.sectors =
 278                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 279                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 280                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 281                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 282
 283                 /* Cards with density > 2GiB are sector addressed */
 284                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 285                         mmc_card_set_blockaddr(card);
 286         }
 287         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 288         switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
 289         case EXT_CSD_CARD_TYPE_SDR_ALL:
 290         case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_8V:
 291         case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_2V:
 292         case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_52:
 293                 card->ext_csd.hs_max_dtr = 200000000;
 294                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_200;
 295                 break;
 296         case EXT_CSD_CARD_TYPE_SDR_1_2V_ALL:
 297         case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_8V:
 298         case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_2V:
 299         case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_52:
 300                 card->ext_csd.hs_max_dtr = 200000000;
 301                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_2V;
 302                 break;
 303         case EXT_CSD_CARD_TYPE_SDR_1_8V_ALL:
 304         case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_8V:
 305         case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_2V:
 306         case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_52:
 307                 card->ext_csd.hs_max_dtr = 200000000;
 308                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_8V;
 309                 break;
 310         case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
 311              EXT_CSD_CARD_TYPE_26:
 312                 card->ext_csd.hs_max_dtr = 52000000;
 313                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
 314                 break;
 315         case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
 316              EXT_CSD_CARD_TYPE_26:
 317                 card->ext_csd.hs_max_dtr = 52000000;
 318                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
 319                 break;
 320         case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
 321              EXT_CSD_CARD_TYPE_26:
 322                 card->ext_csd.hs_max_dtr = 52000000;
 323                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
 324                 break;
 325         case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
 326                 card->ext_csd.hs_max_dtr = 52000000;
 327                 break;
 328         case EXT_CSD_CARD_TYPE_26:
 329                 card->ext_csd.hs_max_dtr = 26000000;
 330                 break;
 331         default:
 332                 /* MMC v4 spec says this cannot happen */
 333                 pr_warning("%s: card is mmc v4 but doesn't "
 334                         "support any high-speed modes.\n",
 335                         mmc_hostname(card->host));
 336         }
 337
 338         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 339         card->ext_csd.raw_erase_timeout_mult =
 340                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 341         card->ext_csd.raw_hc_erase_grp_size =
 342                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 343         if (card->ext_csd.rev >= 3) {
 344                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 345                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 346
 347                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 348                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 349
 350                 /* Sleep / awake timeout in 100ns units */
 351                 if (sa_shift > 0 && sa_shift <= 0x17)
 352                         card->ext_csd.sa_timeout =
 353                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 354                 card->ext_csd.erase_group_def =
 355                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 356                 card->ext_csd.hc_erase_timeout = 300 *
 357                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 358                 card->ext_csd.hc_erase_size =
 359                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 360
 361                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 362
 363                 /*
 364                  * There are two boot regions of equal size, defined in
 365                  * multiples of 128K.
 366                  */
 367                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 368                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 369                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 370                                 mmc_part_add(card, part_size,
 371                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 372                                         "boot%d", idx, true,
 373                                         MMC_BLK_DATA_AREA_BOOT);
 374                         }
 375                 }
 376         }
 377
 378         card->ext_csd.raw_hc_erase_gap_size =
 379                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 380         card->ext_csd.raw_sec_trim_mult =
 381                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 382         card->ext_csd.raw_sec_erase_mult =
 383                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 384         card->ext_csd.raw_sec_feature_support =
 385                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 386         card->ext_csd.raw_trim_mult =
 387                 ext_csd[EXT_CSD_TRIM_MULT];
 388         if (card->ext_csd.rev >= 4) {
 389                 /*
 390                  * Enhanced area feature support -- check whether the eMMC
 391                  * card has the Enhanced area enabled.  If so, export enhanced
 392                  * area offset and size to user by adding sysfs interface.
 393                  */
 394                 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 395                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 396                     (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 397                         hc_erase_grp_sz =
 398                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 399                         hc_wp_grp_sz =
 400                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 401
 402                         card->ext_csd.enhanced_area_en = 1;
 403                         /*
 404                          * calculate the enhanced data area offset, in bytes
 405                          */
 406                         card->ext_csd.enhanced_area_offset =
 407                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
 408                                 (ext_csd[137] << 8) + ext_csd[136];
 409                         if (mmc_card_blockaddr(card))
 410                                 card->ext_csd.enhanced_area_offset <<= 9;
 411                         /*
 412                          * calculate the enhanced data area size, in kilobytes
 413                          */
 414                         card->ext_csd.enhanced_area_size =
 415                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 416                                 ext_csd[140];
 417                         card->ext_csd.enhanced_area_size *=
 418                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 419                         card->ext_csd.enhanced_area_size <<= 9;
 420                 } else {
 421                         /*
 422                          * If the enhanced area is not enabled, disable these
 423                          * device attributes.
 424                          */
 425                         card->ext_csd.enhanced_area_offset = -EINVAL;
 426                         card->ext_csd.enhanced_area_size = -EINVAL;
 427                 }
 428
 429                 /*
 430                  * General purpose partition feature support --
 431                  * If ext_csd has the size of general purpose partitions,
 432                  * set size, part_cfg, partition name in mmc_part.
 433                  */
 434                 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 435                         EXT_CSD_PART_SUPPORT_PART_EN) {
 436                         if (card->ext_csd.enhanced_area_en != 1) {
 437                                 hc_erase_grp_sz =
 438                                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 439                                 hc_wp_grp_sz =
 440                                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 441
 442                                 card->ext_csd.enhanced_area_en = 1;
 443                         }
 444
 445                         for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 446                                 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 447                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 448                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 449                                         continue;
 450                                 part_size =
 451                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 452                                         << 16) +
 453                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 454                                         << 8) +
 455                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 456                                 part_size *= (size_t)(hc_erase_grp_sz *
 457                                         hc_wp_grp_sz);
 458                                 mmc_part_add(card, part_size << 19,
 459                                         EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 460                                         "gp%d", idx, false,
 461                                         MMC_BLK_DATA_AREA_GP);
 462                         }
 463                 }
 464                 card->ext_csd.sec_trim_mult =
 465                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 466                 card->ext_csd.sec_erase_mult =
 467                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 468                 card->ext_csd.sec_feature_support =
 469                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 470                 card->ext_csd.trim_timeout = 300 *
 471                         ext_csd[EXT_CSD_TRIM_MULT];
 472
 473                 /*
 474                  * Note that the call to mmc_part_add above defaults to read
 475                  * only. If this default assumption is changed, the call must
 476                  * take into account the value of boot_locked below.
 477                  */
 478                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 479                 card->ext_csd.boot_ro_lockable = true;
 480         }
 481
 482         if (card->ext_csd.rev >= 5) {
 483                 /* check whether the eMMC card supports HPI */
 484                 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
 485                         card->ext_csd.hpi = 1;
 486                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 487                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 488                         else
 489                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 490                         /*
 491                          * Indicate the maximum timeout to close
 492                          * a command interrupted by HPI
 493                          */
 494                         card->ext_csd.out_of_int_time =
 495                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 496                 }
 497
 498                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 499                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 500         }
 501
 502         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 503         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 504                 card->erased_byte = 0xFF;
 505         else
 506                 card->erased_byte = 0x0;
 507
 508         /* eMMC v4.5 or later */
 509         if (card->ext_csd.rev >= 6) {
 510                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 511
 512                 card->ext_csd.generic_cmd6_time = 10 *
 513                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 514                 card->ext_csd.power_off_longtime = 10 *
 515                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 516
 517                 card->ext_csd.cache_size =
 518                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 519                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 520                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 521                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 522
 523                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 524                         card->ext_csd.data_sector_size = 4096;
 525                 else
 526                         card->ext_csd.data_sector_size = 512;
 527
 528                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 529                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 530                         card->ext_csd.data_tag_unit_size =
 531                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 532                         (card->ext_csd.data_sector_size);
 533                 } else {
 534                         card->ext_csd.data_tag_unit_size = 0;
 535                 }
 536         }
 537
 538 out:
 539         return err;
 540 }
 541
 542 static inline void mmc_free_ext_csd(u8 *ext_csd)
 543 {
 544         kfree(ext_csd);
 545 }
 546
 547
 548 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 549 {
 550         u8 *bw_ext_csd;
 551         int err;
 552
 553         if (bus_width == MMC_BUS_WIDTH_1)
 554                 return 0;
 555
 556         err = mmc_get_ext_csd(card, &bw_ext_csd);
 557
 558         if (err || bw_ext_csd == NULL) {
 559                 if (bus_width != MMC_BUS_WIDTH_1)
 560                         err = -EINVAL;
 561                 goto out;
 562         }
 563
 564         if (bus_width == MMC_BUS_WIDTH_1)
 565                 goto out;
 566
 567         /* only compare read only fields */
 568         err = !((card->ext_csd.raw_partition_support ==
 569                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 570                 (card->ext_csd.raw_erased_mem_count ==
 571                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 572                 (card->ext_csd.rev ==
 573                         bw_ext_csd[EXT_CSD_REV]) &&
 574                 (card->ext_csd.raw_ext_csd_structure ==
 575                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 576                 (card->ext_csd.raw_card_type ==
 577                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 578                 (card->ext_csd.raw_s_a_timeout ==
 579                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 580                 (card->ext_csd.raw_hc_erase_gap_size ==
 581                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 582                 (card->ext_csd.raw_erase_timeout_mult ==
 583                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 584                 (card->ext_csd.raw_hc_erase_grp_size ==
 585                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 586                 (card->ext_csd.raw_sec_trim_mult ==
 587                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 588                 (card->ext_csd.raw_sec_erase_mult ==
 589                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 590                 (card->ext_csd.raw_sec_feature_support ==
 591                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 592                 (card->ext_csd.raw_trim_mult ==
 593                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 594                 (card->ext_csd.raw_sectors[0] ==
 595                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 596                 (card->ext_csd.raw_sectors[1] ==
 597                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 598                 (card->ext_csd.raw_sectors[2] ==
 599                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 600                 (card->ext_csd.raw_sectors[3] ==
 601                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
 602         if (err)
 603                 err = -EINVAL;
 604
 605 out:
 606         mmc_free_ext_csd(bw_ext_csd);
 607         return err;
 608 }
 609
 610 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 611         card->raw_cid[2], card->raw_cid[3]);
 612 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 613         card->raw_csd[2], card->raw_csd[3]);
 614 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 615 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 616 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 617 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 618 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 619 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 620 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 621 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 622 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 623 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 624                 card->ext_csd.enhanced_area_offset);
 625 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 626
 627 static struct attribute *mmc_std_attrs[] = {
 628         &dev_attr_cid.attr,
 629         &dev_attr_csd.attr,
 630         &dev_attr_date.attr,
 631         &dev_attr_erase_size.attr,
 632         &dev_attr_preferred_erase_size.attr,
 633         &dev_attr_fwrev.attr,
 634         &dev_attr_hwrev.attr,
 635         &dev_attr_manfid.attr,
 636         &dev_attr_name.attr,
 637         &dev_attr_oemid.attr,
 638         &dev_attr_serial.attr,
 639         &dev_attr_enhanced_area_offset.attr,
 640         &dev_attr_enhanced_area_size.attr,
 641         NULL,
 642 };
 643
 644 static struct attribute_group mmc_std_attr_group = {
 645         .attrs = mmc_std_attrs,
 646 };
 647
 648 static const struct attribute_group *mmc_attr_groups[] = {
 649         &mmc_std_attr_group,
 650         NULL,
 651 };
 652
 653 static struct device_type mmc_type = {
 654         .groups = mmc_attr_groups,
 655 };
 656
 657 /*
 658  * Select the PowerClass for the current bus width
 659  * If power class is defined for 4/8 bit bus in the
 660  * extended CSD register, select it by executing the
 661  * mmc_switch command.
 662  */
 663 static int mmc_select_powerclass(struct mmc_card *card,
 664                 unsigned int bus_width, u8 *ext_csd)
 665 {
 666         int err = 0;
 667         unsigned int pwrclass_val;
 668         unsigned int index = 0;
 669         struct mmc_host *host;
 670
 671         BUG_ON(!card);
 672
 673         host = card->host;
 674         BUG_ON(!host);
 675
 676         if (ext_csd == NULL)
 677                 return 0;
 678
 679         /* Power class selection is supported for versions >= 4.0 */
 680         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 681                 return 0;
 682
 683         /* Power class values are defined only for 4/8 bit bus */
 684         if (bus_width == EXT_CSD_BUS_WIDTH_1)
 685                 return 0;
 686
 687         switch (1 << host->ios.vdd) {
 688         case MMC_VDD_165_195:
 689                 if (host->ios.clock <= 26000000)
 690                         index = EXT_CSD_PWR_CL_26_195;
 691                 else if (host->ios.clock <= 52000000)
 692                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 693                                 EXT_CSD_PWR_CL_52_195 :
 694                                 EXT_CSD_PWR_CL_DDR_52_195;
 695                 else if (host->ios.clock <= 200000000)
 696                         index = EXT_CSD_PWR_CL_200_195;
 697                 break;
 698         case MMC_VDD_32_33:
 699         case MMC_VDD_33_34:
 700         case MMC_VDD_34_35:
 701         case MMC_VDD_35_36:
 702                 if (host->ios.clock <= 26000000)
 703                         index = EXT_CSD_PWR_CL_26_360;
 704                 else if (host->ios.clock <= 52000000)
 705                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 706                                 EXT_CSD_PWR_CL_52_360 :
 707                                 EXT_CSD_PWR_CL_DDR_52_360;
 708                 else if (host->ios.clock <= 200000000)
 709                         index = EXT_CSD_PWR_CL_200_360;
 710                 break;
 711         default:
 712                 pr_warning("%s: Voltage range not supported "
 713                            "for power class.\n", mmc_hostname(host));
 714                 return -EINVAL;
 715         }
 716
 717         pwrclass_val = ext_csd[index];
 718
 719         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 720                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 721                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 722         else
 723                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 724                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 725
 726         /* If the power class is different from the default value */
 727         if (pwrclass_val > 0) {
 728                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 729                                  EXT_CSD_POWER_CLASS,
 730                                  pwrclass_val,
 731                                  card->ext_csd.generic_cmd6_time);
 732         }
 733
 734         return err;
 735 }
 736
 737 /*
 738  * Selects the desired buswidth and switch to the HS200 mode
 739  * if bus width set without error
 740  */
 741 static int mmc_select_hs200(struct mmc_card *card)
 742 {
 743         int idx, err = 0;
 744         struct mmc_host *host;
 745         static unsigned ext_csd_bits[] = {
 746                 EXT_CSD_BUS_WIDTH_4,
 747                 EXT_CSD_BUS_WIDTH_8,
 748         };
 749         static unsigned bus_widths[] = {
 750                 MMC_BUS_WIDTH_4,
 751                 MMC_BUS_WIDTH_8,
 752         };
 753
 754         BUG_ON(!card);
 755
 756         host = card->host;
 757
 758         if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
 759             host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
 760                 if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0))
 761                         err = mmc_set_signal_voltage(host,
 762                                                      MMC_SIGNAL_VOLTAGE_180, 0);
 763
 764         /* If fails try again during next card power cycle */
 765         if (err)
 766                 goto err;
 767
 768         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0;
 769
 770         /*
 771          * Unlike SD, MMC cards dont have a configuration register to notify
 772          * supported bus width. So bus test command should be run to identify
 773          * the supported bus width or compare the ext csd values of current
 774          * bus width and ext csd values of 1 bit mode read earlier.
 775          */
 776         for (; idx >= 0; idx--) {
 777
 778                 /*
 779                  * Host is capable of 8bit transfer, then switch
 780                  * the device to work in 8bit transfer mode. If the
 781                  * mmc switch command returns error then switch to
 782                  * 4bit transfer mode. On success set the corresponding
 783                  * bus width on the host.
 784                  */
 785                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 786                                  EXT_CSD_BUS_WIDTH,
 787                                  ext_csd_bits[idx],
 788                                  card->ext_csd.generic_cmd6_time);
 789                 if (err)
 790                         continue;
 791
 792                 mmc_set_bus_width(card->host, bus_widths[idx]);
 793
 794                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 795                         err = mmc_compare_ext_csds(card, bus_widths[idx]);
 796                 else
 797                         err = mmc_bus_test(card, bus_widths[idx]);
 798                 if (!err)
 799                         break;
 800         }
 801
 802         /* switch to HS200 mode if bus width set successfully */
 803         if (!err)
 804                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 805                                  EXT_CSD_HS_TIMING, 2, 0);
 806 err:
 807         return err;
 808 }
 809
 810 /*
 811  * Handle the detection and initialisation of a card.
 812  *
 813  * In the case of a resume, "oldcard" will contain the card
 814  * we're trying to reinitialise.
 815  */
 816 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 817         struct mmc_card *oldcard)
 818 {
 819         struct mmc_card *card;
 820         int err, ddr = 0;
 821         u32 cid[4];
 822         unsigned int max_dtr;
 823         u32 rocr;
 824         u8 *ext_csd = NULL;
 825
 826         BUG_ON(!host);
 827         WARN_ON(!host->claimed);
 828
 829         /* Set correct bus mode for MMC before attempting init */
 830         if (!mmc_host_is_spi(host))
 831                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 832
 833         /* Initialization should be done at 3.3 V I/O voltage. */
 834         mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
 835
 836         /*
 837          * Since we're changing the OCR value, we seem to
 838          * need to tell some cards to go back to the idle
 839          * state.  We wait 1ms to give cards time to
 840          * respond.
 841          * mmc_go_idle is needed for eMMC that are asleep
 842          */
 843         mmc_go_idle(host);
 844
 845         /* The extra bit indicates that we support high capacity */
 846         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 847         if (err)
 848                 goto err;
 849
 850         /*
 851          * For SPI, enable CRC as appropriate.
 852          */
 853         if (mmc_host_is_spi(host)) {
 854                 err = mmc_spi_set_crc(host, use_spi_crc);
 855                 if (err)
 856                         goto err;
 857         }
 858
 859         /*
 860          * Fetch CID from card.
 861          */
 862         if (mmc_host_is_spi(host))
 863                 err = mmc_send_cid(host, cid);
 864         else
 865                 err = mmc_all_send_cid(host, cid);
 866         if (err)
 867                 goto err;
 868
 869         if (oldcard) {
 870                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 871                         err = -ENOENT;
 872                         goto err;
 873                 }
 874
 875                 card = oldcard;
 876         } else {
 877                 /*
 878                  * Allocate card structure.
 879                  */
 880                 card = mmc_alloc_card(host, &mmc_type);
 881                 if (IS_ERR(card)) {
 882                         err = PTR_ERR(card);
 883                         goto err;
 884                 }
 885
 886                 card->type = MMC_TYPE_MMC;
 887                 card->rca = 1;
 888                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 889         }
 890
 891         /*
 892          * For native busses:  set card RCA and quit open drain mode.
 893          */
 894         if (!mmc_host_is_spi(host)) {
 895                 err = mmc_set_relative_addr(card);
 896                 if (err)
 897                         goto free_card;
 898
 899                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 900         }
 901
 902         if (!oldcard) {
 903                 /*
 904                  * Fetch CSD from card.
 905                  */
 906                 err = mmc_send_csd(card, card->raw_csd);
 907                 if (err)
 908                         goto free_card;
 909
 910                 err = mmc_decode_csd(card);
 911                 if (err)
 912                         goto free_card;
 913                 err = mmc_decode_cid(card);
 914                 if (err)
 915                         goto free_card;
 916         }
 917
 918         /*
 919          * Select card, as all following commands rely on that.
 920          */
 921         if (!mmc_host_is_spi(host)) {
 922                 err = mmc_select_card(card);
 923                 if (err)
 924                         goto free_card;
 925         }
 926
 927         if (!oldcard) {
 928                 /*
 929                  * Fetch and process extended CSD.
 930                  */
 931
 932                 err = mmc_get_ext_csd(card, &ext_csd);
 933                 if (err)
 934                         goto free_card;
 935                 err = mmc_read_ext_csd(card, ext_csd);
 936                 if (err)
 937                         goto free_card;
 938
 939                 /* If doing byte addressing, check if required to do sector
 940                  * addressing.  Handle the case of <2GB cards needing sector
 941                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 942                  * ocr register has bit 30 set for sector addressing.
 943                  */
 944                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 945                         mmc_card_set_blockaddr(card);
 946
 947                 /* Erase size depends on CSD and Extended CSD */
 948                 mmc_set_erase_size(card);
 949         }
 950
 951         /*
 952          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 953          * bit.  This bit will be lost every time after a reset or power off.
 954          */
 955         if (card->ext_csd.enhanced_area_en) {
 956                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 957                                  EXT_CSD_ERASE_GROUP_DEF, 1,
 958                                  card->ext_csd.generic_cmd6_time);
 959
 960                 if (err && err != -EBADMSG)
 961                         goto free_card;
 962
 963                 if (err) {
 964                         err = 0;
 965                         /*
 966                          * Just disable enhanced area off & sz
 967                          * will try to enable ERASE_GROUP_DEF
 968                          * during next time reinit
 969                          */
 970                         card->ext_csd.enhanced_area_offset = -EINVAL;
 971                         card->ext_csd.enhanced_area_size = -EINVAL;
 972                 } else {
 973                         card->ext_csd.erase_group_def = 1;
 974                         /*
 975                          * enable ERASE_GRP_DEF successfully.
 976                          * This will affect the erase size, so
 977                          * here need to reset erase size
 978                          */
 979                         mmc_set_erase_size(card);
 980                 }
 981         }
 982
 983         /*
 984          * Ensure eMMC user default partition is enabled
 985          */
 986         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
 987                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 988                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
 989                                  card->ext_csd.part_config,
 990                                  card->ext_csd.part_time);
 991                 if (err && err != -EBADMSG)
 992                         goto free_card;
 993         }
 994
 995         /*
 996          * If the host supports the power_off_notify capability then
 997          * set the notification byte in the ext_csd register of device
 998          */
 999         if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
1000             (card->ext_csd.rev >= 6)) {
1001                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1002                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1003                                  EXT_CSD_POWER_ON,
1004                                  card->ext_csd.generic_cmd6_time);
1005                 if (err && err != -EBADMSG)
1006                         goto free_card;
1007
1008                 /*
1009                  * The err can be -EBADMSG or 0,
1010                  * so check for success and update the flag
1011                  */
1012                 if (!err)
1013                         card->poweroff_notify_state = MMC_POWERED_ON;
1014         }
1015
1016         /*
1017          * Activate high speed (if supported)
1018          */
1019         if (card->ext_csd.hs_max_dtr != 0) {
1020                 err = 0;
1021                 if (card->ext_csd.hs_max_dtr > 52000000 &&
1022                     host->caps2 & MMC_CAP2_HS200)
1023                         err = mmc_select_hs200(card);
1024                 else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
1025                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1026                                          EXT_CSD_HS_TIMING, 1,
1027                                          card->ext_csd.generic_cmd6_time);
1028
1029                 if (err && err != -EBADMSG)
1030                         goto free_card;
1031
1032                 if (err) {
1033                         pr_warning("%s: switch to highspeed failed\n",
1034                                mmc_hostname(card->host));
1035                         err = 0;
1036                 } else {
1037                         if (card->ext_csd.hs_max_dtr > 52000000 &&
1038                             host->caps2 & MMC_CAP2_HS200) {
1039                                 mmc_card_set_hs200(card);
1040                                 mmc_set_timing(card->host,
1041                                                MMC_TIMING_MMC_HS200);
1042                         } else {
1043                                 mmc_card_set_highspeed(card);
1044                                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1045                         }
1046                 }
1047         }
1048
1049         /*
1050          * Compute bus speed.
1051          */
1052         max_dtr = (unsigned int)-1;
1053
1054         if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
1055                 if (max_dtr > card->ext_csd.hs_max_dtr)
1056                         max_dtr = card->ext_csd.hs_max_dtr;
1057         } else if (max_dtr > card->csd.max_dtr) {
1058                 max_dtr = card->csd.max_dtr;
1059         }
1060
1061         mmc_set_clock(host, max_dtr);
1062
1063         /*
1064          * Indicate DDR mode (if supported).
1065          */
1066         if (mmc_card_highspeed(card)) {
1067                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
1068                         && ((host->caps & (MMC_CAP_1_8V_DDR |
1069                              MMC_CAP_UHS_DDR50))
1070                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
1071                                 ddr = MMC_1_8V_DDR_MODE;
1072                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1073                         && ((host->caps & (MMC_CAP_1_2V_DDR |
1074                              MMC_CAP_UHS_DDR50))
1075                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
1076                                 ddr = MMC_1_2V_DDR_MODE;
1077         }
1078
1079         /*
1080          * Indicate HS200 SDR mode (if supported).
1081          */
1082         if (mmc_card_hs200(card)) {
1083                 u32 ext_csd_bits;
1084                 u32 bus_width = card->host->ios.bus_width;
1085
1086                 /*
1087                  * For devices supporting HS200 mode, the bus width has
1088                  * to be set before executing the tuning function. If
1089                  * set before tuning, then device will respond with CRC
1090                  * errors for responses on CMD line. So for HS200 the
1091                  * sequence will be
1092                  * 1. set bus width 4bit / 8 bit (1 bit not supported)
1093                  * 2. switch to HS200 mode
1094                  * 3. set the clock to > 52Mhz <=200MHz and
1095                  * 4. execute tuning for HS200
1096                  */
1097                 if ((host->caps2 & MMC_CAP2_HS200) &&
1098                     card->host->ops->execute_tuning) {
1099                         mmc_host_clk_hold(card->host);
1100                         err = card->host->ops->execute_tuning(card->host,
1101                                 MMC_SEND_TUNING_BLOCK_HS200);
1102                         mmc_host_clk_release(card->host);
1103                 }
1104                 if (err) {
1105                         pr_warning("%s: tuning execution failed\n",
1106                                    mmc_hostname(card->host));
1107                         goto err;
1108                 }
1109
1110                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1111                                 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
1112                 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
1113                 if (err) {
1114                         pr_err("%s: power class selection to bus width %d failed\n",
1115                                 mmc_hostname(card->host), 1 << bus_width);
1116                         goto err;
1117                 }
1118         }
1119
1120         /*
1121          * Activate wide bus and DDR (if supported).
1122          */
1123         if (!mmc_card_hs200(card) &&
1124             (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
1125             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
1126                 static unsigned ext_csd_bits[][2] = {
1127                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
1128                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
1129                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
1130                 };
1131                 static unsigned bus_widths[] = {
1132                         MMC_BUS_WIDTH_8,
1133                         MMC_BUS_WIDTH_4,
1134                         MMC_BUS_WIDTH_1
1135                 };
1136                 unsigned idx, bus_width = 0;
1137
1138                 if (host->caps & MMC_CAP_8_BIT_DATA)
1139                         idx = 0;
1140                 else
1141                         idx = 1;
1142                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1143                         bus_width = bus_widths[idx];
1144                         if (bus_width == MMC_BUS_WIDTH_1)
1145                                 ddr = 0; /* no DDR for 1-bit width */
1146                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
1147                                                     ext_csd);
1148                         if (err)
1149                                 pr_err("%s: power class selection to "
1150                                        "bus width %d failed\n",
1151                                        mmc_hostname(card->host),
1152                                        1 << bus_width);
1153
1154                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1155                                          EXT_CSD_BUS_WIDTH,
1156                                          ext_csd_bits[idx][0],
1157                                          card->ext_csd.generic_cmd6_time);
1158                         if (!err) {
1159                                 mmc_set_bus_width(card->host, bus_width);
1160
1161                                 /*
1162                                  * If controller can't handle bus width test,
1163                                  * compare ext_csd previously read in 1 bit mode
1164                                  * against ext_csd at new bus width
1165                                  */
1166                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1167                                         err = mmc_compare_ext_csds(card,
1168                                                 bus_width);
1169                                 else
1170                                         err = mmc_bus_test(card, bus_width);
1171                                 if (!err)
1172                                         break;
1173                         }
1174                 }
1175
1176                 if (!err && ddr) {
1177                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1178                                                     ext_csd);
1179                         if (err)
1180                                 pr_err("%s: power class selection to "
1181                                        "bus width %d ddr %d failed\n",
1182                                        mmc_hostname(card->host),
1183                                        1 << bus_width, ddr);
1184
1185                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1186                                          EXT_CSD_BUS_WIDTH,
1187                                          ext_csd_bits[idx][1],
1188                                          card->ext_csd.generic_cmd6_time);
1189                 }
1190                 if (err) {
1191                         pr_warning("%s: switch to bus width %d ddr %d "
1192                                 "failed\n", mmc_hostname(card->host),
1193                                 1 << bus_width, ddr);
1194                         goto free_card;
1195                 } else if (ddr) {
1196                         /*
1197                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1198                          * signaling.
1199                          *
1200                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1201                          *
1202                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1203                          * in the JEDEC spec for DDR.
1204                          *
1205                          * Do not force change in vccq since we are obviously
1206                          * working and no change to vccq is needed.
1207                          *
1208                          * WARNING: eMMC rules are NOT the same as SD DDR
1209                          */
1210                         if (ddr == MMC_1_2V_DDR_MODE) {
1211                                 err = mmc_set_signal_voltage(host,
1212                                         MMC_SIGNAL_VOLTAGE_120, 0);
1213                                 if (err)
1214                                         goto err;
1215                         }
1216                         mmc_card_set_ddr_mode(card);
1217                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1218                         mmc_set_bus_width(card->host, bus_width);
1219                 }
1220         }
1221
1222         /*
1223          * Enable HPI feature (if supported)
1224          */
1225         if (card->ext_csd.hpi) {
1226                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1227                                 EXT_CSD_HPI_MGMT, 1,
1228                                 card->ext_csd.generic_cmd6_time);
1229                 if (err && err != -EBADMSG)
1230                         goto free_card;
1231                 if (err) {
1232                         pr_warning("%s: Enabling HPI failed\n",
1233                                    mmc_hostname(card->host));
1234                         err = 0;
1235                 } else
1236                         card->ext_csd.hpi_en = 1;
1237         }
1238
1239         /*
1240          * If cache size is higher than 0, this indicates
1241          * the existence of cache and it can be turned on.
1242          */
1243         if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1244                         card->ext_csd.cache_size > 0) {
1245                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1246                                 EXT_CSD_CACHE_CTRL, 1,
1247                                 card->ext_csd.generic_cmd6_time);
1248                 if (err && err != -EBADMSG)
1249                         goto free_card;
1250
1251                 /*
1252                  * Only if no error, cache is turned on successfully.
1253                  */
1254                 if (err) {
1255                         pr_warning("%s: Cache is supported, "
1256                                         "but failed to turn on (%d)\n",
1257                                         mmc_hostname(card->host), err);
1258                         card->ext_csd.cache_ctrl = 0;
1259                         err = 0;
1260                 } else {
1261                         card->ext_csd.cache_ctrl = 1;
1262                 }
1263         }
1264
1265         if (!oldcard)
1266                 host->card = card;
1267
1268         mmc_free_ext_csd(ext_csd);
1269         return 0;
1270
1271 free_card:
1272         if (!oldcard)
1273                 mmc_remove_card(card);
1274 err:
1275         mmc_free_ext_csd(ext_csd);
1276
1277         return err;
1278 }
1279
1280 /*
1281  * Host is being removed. Free up the current card.
1282  */
1283 static void mmc_remove(struct mmc_host *host)
1284 {
1285         BUG_ON(!host);
1286         BUG_ON(!host->card);
1287
1288         mmc_remove_card(host->card);
1289         host->card = NULL;
1290 }
1291
1292 /*
1293  * Card detection - card is alive.
1294  */
1295 static int mmc_alive(struct mmc_host *host)
1296 {
1297         return mmc_send_status(host->card, NULL);
1298 }
1299
1300 /*
1301  * Card detection callback from host.
1302  */
1303 static void mmc_detect(struct mmc_host *host)
1304 {
1305         int err;
1306
1307         BUG_ON(!host);
1308         BUG_ON(!host->card);
1309
1310         mmc_claim_host(host);
1311
1312         /*
1313          * Just check if our card has been removed.
1314          */
1315         err = _mmc_detect_card_removed(host);
1316
1317         mmc_release_host(host);
1318
1319         if (err) {
1320                 mmc_remove(host);
1321
1322                 mmc_claim_host(host);
1323                 mmc_detach_bus(host);
1324                 mmc_power_off(host);
1325                 mmc_release_host(host);
1326         }
1327 }
1328
1329 /*
1330  * Suspend callback from host.
1331  */
1332 static int mmc_suspend(struct mmc_host *host)
1333 {
1334         int err = 0;
1335
1336         BUG_ON(!host);
1337         BUG_ON(!host->card);
1338
1339         mmc_claim_host(host);
1340         if (mmc_card_can_sleep(host)) {
1341                 err = mmc_card_sleep(host);
1342                 if (!err)
1343                         mmc_card_set_sleep(host->card);
1344         } else if (!mmc_host_is_spi(host))
1345                 mmc_deselect_cards(host);
1346         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1347         mmc_release_host(host);
1348
1349         return err;
1350 }
1351
1352 /*
1353  * Resume callback from host.
1354  *
1355  * This function tries to determine if the same card is still present
1356  * and, if so, restore all state to it.
1357  */
1358 static int mmc_resume(struct mmc_host *host)
1359 {
1360         int err;
1361
1362         BUG_ON(!host);
1363         BUG_ON(!host->card);
1364
1365         mmc_claim_host(host);
1366         if (mmc_card_is_sleep(host->card)) {
1367                 err = mmc_card_awake(host);
1368                 mmc_card_clr_sleep(host->card);
1369         } else
1370                 err = mmc_init_card(host, host->ocr, host->card);
1371         mmc_release_host(host);
1372
1373         return err;
1374 }
1375
1376 static int mmc_power_restore(struct mmc_host *host)
1377 {
1378         int ret;
1379
1380         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1381         mmc_card_clr_sleep(host->card);
1382         mmc_claim_host(host);
1383         ret = mmc_init_card(host, host->ocr, host->card);
1384         mmc_release_host(host);
1385
1386         return ret;
1387 }
1388
1389 static int mmc_sleep(struct mmc_host *host)
1390 {
1391         struct mmc_card *card = host->card;
1392         int err = -ENOSYS;
1393
1394         if (card && card->ext_csd.rev >= 3) {
1395                 err = mmc_card_sleepawake(host, 1);
1396                 if (err < 0)
1397                         pr_debug("%s: Error %d while putting card into sleep",
1398                                  mmc_hostname(host), err);
1399         }
1400
1401         return err;
1402 }
1403
1404 static int mmc_awake(struct mmc_host *host)
1405 {
1406         struct mmc_card *card = host->card;
1407         int err = -ENOSYS;
1408
1409         if (card && card->ext_csd.rev >= 3) {
1410                 err = mmc_card_sleepawake(host, 0);
1411                 if (err < 0)
1412                         pr_debug("%s: Error %d while awaking sleeping card",
1413                                  mmc_hostname(host), err);
1414         }
1415
1416         return err;
1417 }
1418
1419 static const struct mmc_bus_ops mmc_ops = {
1420         .awake = mmc_awake,
1421         .sleep = mmc_sleep,
1422         .remove = mmc_remove,
1423         .detect = mmc_detect,
1424         .suspend = NULL,
1425         .resume = NULL,
1426         .power_restore = mmc_power_restore,
1427         .alive = mmc_alive,
1428 };
1429
1430 static const struct mmc_bus_ops mmc_ops_unsafe = {
1431         .awake = mmc_awake,
1432         .sleep = mmc_sleep,
1433         .remove = mmc_remove,
1434         .detect = mmc_detect,
1435         .suspend = mmc_suspend,
1436         .resume = mmc_resume,
1437         .power_restore = mmc_power_restore,
1438         .alive = mmc_alive,
1439 };
1440
1441 static void mmc_attach_bus_ops(struct mmc_host *host)
1442 {
1443         const struct mmc_bus_ops *bus_ops;
1444
1445         if (!mmc_card_is_removable(host))
1446                 bus_ops = &mmc_ops_unsafe;
1447         else
1448                 bus_ops = &mmc_ops;
1449         mmc_attach_bus(host, bus_ops);
1450 }
1451
1452 /*
1453  * Starting point for MMC card init.
1454  */
1455 int mmc_attach_mmc(struct mmc_host *host)
1456 {
1457         int err;
1458         u32 ocr;
1459
1460         BUG_ON(!host);
1461         WARN_ON(!host->claimed);
1462
1463         /* Set correct bus mode for MMC before attempting attach */
1464         if (!mmc_host_is_spi(host))
1465                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1466
1467         err = mmc_send_op_cond(host, 0, &ocr);
1468         if (err)
1469                 return err;
1470
1471         mmc_attach_bus_ops(host);
1472         if (host->ocr_avail_mmc)
1473                 host->ocr_avail = host->ocr_avail_mmc;
1474
1475         /*
1476          * We need to get OCR a different way for SPI.
1477          */
1478         if (mmc_host_is_spi(host)) {
1479                 err = mmc_spi_read_ocr(host, 1, &ocr);
1480                 if (err)
1481                         goto err;
1482         }
1483
1484         /*
1485          * Sanity check the voltages that the card claims to
1486          * support.
1487          */
1488         if (ocr & 0x7F) {
1489                 pr_warning("%s: card claims to support voltages "
1490                        "below the defined range. These will be ignored.\n",
1491                        mmc_hostname(host));
1492                 ocr &= ~0x7F;
1493         }
1494
1495         host->ocr = mmc_select_voltage(host, ocr);
1496
1497         /*
1498          * Can we support the voltage of the card?
1499          */
1500         if (!host->ocr) {
1501                 err = -EINVAL;
1502                 goto err;
1503         }
1504
1505         /*
1506          * Detect and init the card.
1507          */
1508         err = mmc_init_card(host, host->ocr, NULL);
1509         if (err)
1510                 goto err;
1511
1512         mmc_release_host(host);
1513         err = mmc_add_card(host->card);
1514         mmc_claim_host(host);
1515         if (err)
1516                 goto remove_card;
1517
1518         return 0;
1519
1520 remove_card:
1521         mmc_release_host(host);
1522         mmc_remove_card(host->card);
1523         mmc_claim_host(host);
1524         host->card = NULL;
1525 err:
1526         mmc_detach_bus(host);
1527
1528         pr_err("%s: error %d whilst initialising MMC card\n",
1529                 mmc_hostname(host), err);
1530
1531         return err;
1532 }