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
 524 out:
 525         return err;
 526 }
 527
 528 static inline void mmc_free_ext_csd(u8 *ext_csd)
 529 {
 530         kfree(ext_csd);
 531 }
 532
 533
 534 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 535 {
 536         u8 *bw_ext_csd;
 537         int err;
 538
 539         if (bus_width == MMC_BUS_WIDTH_1)
 540                 return 0;
 541
 542         err = mmc_get_ext_csd(card, &bw_ext_csd);
 543
 544         if (err || bw_ext_csd == NULL) {
 545                 if (bus_width != MMC_BUS_WIDTH_1)
 546                         err = -EINVAL;
 547                 goto out;
 548         }
 549
 550         if (bus_width == MMC_BUS_WIDTH_1)
 551                 goto out;
 552
 553         /* only compare read only fields */
 554         err = !((card->ext_csd.raw_partition_support ==
 555                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 556                 (card->ext_csd.raw_erased_mem_count ==
 557                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 558                 (card->ext_csd.rev ==
 559                         bw_ext_csd[EXT_CSD_REV]) &&
 560                 (card->ext_csd.raw_ext_csd_structure ==
 561                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 562                 (card->ext_csd.raw_card_type ==
 563                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 564                 (card->ext_csd.raw_s_a_timeout ==
 565                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 566                 (card->ext_csd.raw_hc_erase_gap_size ==
 567                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 568                 (card->ext_csd.raw_erase_timeout_mult ==
 569                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 570                 (card->ext_csd.raw_hc_erase_grp_size ==
 571                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 572                 (card->ext_csd.raw_sec_trim_mult ==
 573                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 574                 (card->ext_csd.raw_sec_erase_mult ==
 575                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 576                 (card->ext_csd.raw_sec_feature_support ==
 577                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 578                 (card->ext_csd.raw_trim_mult ==
 579                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 580                 (card->ext_csd.raw_sectors[0] ==
 581                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 582                 (card->ext_csd.raw_sectors[1] ==
 583                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 584                 (card->ext_csd.raw_sectors[2] ==
 585                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 586                 (card->ext_csd.raw_sectors[3] ==
 587                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
 588         if (err)
 589                 err = -EINVAL;
 590
 591 out:
 592         mmc_free_ext_csd(bw_ext_csd);
 593         return err;
 594 }
 595
 596 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 597         card->raw_cid[2], card->raw_cid[3]);
 598 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 599         card->raw_csd[2], card->raw_csd[3]);
 600 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 601 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 602 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 603 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 604 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 605 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 606 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 607 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 608 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 609 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 610                 card->ext_csd.enhanced_area_offset);
 611 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 612
 613 static struct attribute *mmc_std_attrs[] = {
 614         &dev_attr_cid.attr,
 615         &dev_attr_csd.attr,
 616         &dev_attr_date.attr,
 617         &dev_attr_erase_size.attr,
 618         &dev_attr_preferred_erase_size.attr,
 619         &dev_attr_fwrev.attr,
 620         &dev_attr_hwrev.attr,
 621         &dev_attr_manfid.attr,
 622         &dev_attr_name.attr,
 623         &dev_attr_oemid.attr,
 624         &dev_attr_serial.attr,
 625         &dev_attr_enhanced_area_offset.attr,
 626         &dev_attr_enhanced_area_size.attr,
 627         NULL,
 628 };
 629
 630 static struct attribute_group mmc_std_attr_group = {
 631         .attrs = mmc_std_attrs,
 632 };
 633
 634 static const struct attribute_group *mmc_attr_groups[] = {
 635         &mmc_std_attr_group,
 636         NULL,
 637 };
 638
 639 static struct device_type mmc_type = {
 640         .groups = mmc_attr_groups,
 641 };
 642
 643 /*
 644  * Select the PowerClass for the current bus width
 645  * If power class is defined for 4/8 bit bus in the
 646  * extended CSD register, select it by executing the
 647  * mmc_switch command.
 648  */
 649 static int mmc_select_powerclass(struct mmc_card *card,
 650                 unsigned int bus_width, u8 *ext_csd)
 651 {
 652         int err = 0;
 653         unsigned int pwrclass_val;
 654         unsigned int index = 0;
 655         struct mmc_host *host;
 656
 657         BUG_ON(!card);
 658
 659         host = card->host;
 660         BUG_ON(!host);
 661
 662         if (ext_csd == NULL)
 663                 return 0;
 664
 665         /* Power class selection is supported for versions >= 4.0 */
 666         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 667                 return 0;
 668
 669         /* Power class values are defined only for 4/8 bit bus */
 670         if (bus_width == EXT_CSD_BUS_WIDTH_1)
 671                 return 0;
 672
 673         switch (1 << host->ios.vdd) {
 674         case MMC_VDD_165_195:
 675                 if (host->ios.clock <= 26000000)
 676                         index = EXT_CSD_PWR_CL_26_195;
 677                 else if (host->ios.clock <= 52000000)
 678                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 679                                 EXT_CSD_PWR_CL_52_195 :
 680                                 EXT_CSD_PWR_CL_DDR_52_195;
 681                 else if (host->ios.clock <= 200000000)
 682                         index = EXT_CSD_PWR_CL_200_195;
 683                 break;
 684         case MMC_VDD_32_33:
 685         case MMC_VDD_33_34:
 686         case MMC_VDD_34_35:
 687         case MMC_VDD_35_36:
 688                 if (host->ios.clock <= 26000000)
 689                         index = EXT_CSD_PWR_CL_26_360;
 690                 else if (host->ios.clock <= 52000000)
 691                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 692                                 EXT_CSD_PWR_CL_52_360 :
 693                                 EXT_CSD_PWR_CL_DDR_52_360;
 694                 else if (host->ios.clock <= 200000000)
 695                         index = EXT_CSD_PWR_CL_200_360;
 696                 break;
 697         default:
 698                 pr_warning("%s: Voltage range not supported "
 699                            "for power class.\n", mmc_hostname(host));
 700                 return -EINVAL;
 701         }
 702
 703         pwrclass_val = ext_csd[index];
 704
 705         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 706                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 707                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 708         else
 709                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 710                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 711
 712         /* If the power class is different from the default value */
 713         if (pwrclass_val > 0) {
 714                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 715                                  EXT_CSD_POWER_CLASS,
 716                                  pwrclass_val,
 717                                  card->ext_csd.generic_cmd6_time);
 718         }
 719
 720         return err;
 721 }
 722
 723 /*
 724  * Selects the desired buswidth and switch to the HS200 mode
 725  * if bus width set without error
 726  */
 727 static int mmc_select_hs200(struct mmc_card *card)
 728 {
 729         int idx, err = 0;
 730         struct mmc_host *host;
 731         static unsigned ext_csd_bits[] = {
 732                 EXT_CSD_BUS_WIDTH_4,
 733                 EXT_CSD_BUS_WIDTH_8,
 734         };
 735         static unsigned bus_widths[] = {
 736                 MMC_BUS_WIDTH_4,
 737                 MMC_BUS_WIDTH_8,
 738         };
 739
 740         BUG_ON(!card);
 741
 742         host = card->host;
 743
 744         if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
 745             host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
 746                 if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0))
 747                         err = mmc_set_signal_voltage(host,
 748                                                      MMC_SIGNAL_VOLTAGE_180, 0);
 749
 750         /* If fails try again during next card power cycle */
 751         if (err)
 752                 goto err;
 753
 754         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0;
 755
 756         /*
 757          * Unlike SD, MMC cards dont have a configuration register to notify
 758          * supported bus width. So bus test command should be run to identify
 759          * the supported bus width or compare the ext csd values of current
 760          * bus width and ext csd values of 1 bit mode read earlier.
 761          */
 762         for (; idx >= 0; idx--) {
 763
 764                 /*
 765                  * Host is capable of 8bit transfer, then switch
 766                  * the device to work in 8bit transfer mode. If the
 767                  * mmc switch command returns error then switch to
 768                  * 4bit transfer mode. On success set the corresponding
 769                  * bus width on the host.
 770                  */
 771                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 772                                  EXT_CSD_BUS_WIDTH,
 773                                  ext_csd_bits[idx],
 774                                  card->ext_csd.generic_cmd6_time);
 775                 if (err)
 776                         continue;
 777
 778                 mmc_set_bus_width(card->host, bus_widths[idx]);
 779
 780                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 781                         err = mmc_compare_ext_csds(card, bus_widths[idx]);
 782                 else
 783                         err = mmc_bus_test(card, bus_widths[idx]);
 784                 if (!err)
 785                         break;
 786         }
 787
 788         /* switch to HS200 mode if bus width set successfully */
 789         if (!err)
 790                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 791                                  EXT_CSD_HS_TIMING, 2, 0);
 792 err:
 793         return err;
 794 }
 795
 796 /*
 797  * Handle the detection and initialisation of a card.
 798  *
 799  * In the case of a resume, "oldcard" will contain the card
 800  * we're trying to reinitialise.
 801  */
 802 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 803         struct mmc_card *oldcard)
 804 {
 805         struct mmc_card *card;
 806         int err, ddr = 0;
 807         u32 cid[4];
 808         unsigned int max_dtr;
 809         u32 rocr;
 810         u8 *ext_csd = NULL;
 811
 812         BUG_ON(!host);
 813         WARN_ON(!host->claimed);
 814
 815         /* Set correct bus mode for MMC before attempting init */
 816         if (!mmc_host_is_spi(host))
 817                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 818
 819         /* Initialization should be done at 3.3 V I/O voltage. */
 820         mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
 821
 822         /*
 823          * Since we're changing the OCR value, we seem to
 824          * need to tell some cards to go back to the idle
 825          * state.  We wait 1ms to give cards time to
 826          * respond.
 827          * mmc_go_idle is needed for eMMC that are asleep
 828          */
 829         mmc_go_idle(host);
 830
 831         /* The extra bit indicates that we support high capacity */
 832         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 833         if (err)
 834                 goto err;
 835
 836         /*
 837          * For SPI, enable CRC as appropriate.
 838          */
 839         if (mmc_host_is_spi(host)) {
 840                 err = mmc_spi_set_crc(host, use_spi_crc);
 841                 if (err)
 842                         goto err;
 843         }
 844
 845         /*
 846          * Fetch CID from card.
 847          */
 848         if (mmc_host_is_spi(host))
 849                 err = mmc_send_cid(host, cid);
 850         else
 851                 err = mmc_all_send_cid(host, cid);
 852         if (err)
 853                 goto err;
 854
 855         if (oldcard) {
 856                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 857                         err = -ENOENT;
 858                         goto err;
 859                 }
 860
 861                 card = oldcard;
 862         } else {
 863                 /*
 864                  * Allocate card structure.
 865                  */
 866                 card = mmc_alloc_card(host, &mmc_type);
 867                 if (IS_ERR(card)) {
 868                         err = PTR_ERR(card);
 869                         goto err;
 870                 }
 871
 872                 card->type = MMC_TYPE_MMC;
 873                 card->rca = 1;
 874                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 875         }
 876
 877         /*
 878          * For native busses:  set card RCA and quit open drain mode.
 879          */
 880         if (!mmc_host_is_spi(host)) {
 881                 err = mmc_set_relative_addr(card);
 882                 if (err)
 883                         goto free_card;
 884
 885                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 886         }
 887
 888         if (!oldcard) {
 889                 /*
 890                  * Fetch CSD from card.
 891                  */
 892                 err = mmc_send_csd(card, card->raw_csd);
 893                 if (err)
 894                         goto free_card;
 895
 896                 err = mmc_decode_csd(card);
 897                 if (err)
 898                         goto free_card;
 899                 err = mmc_decode_cid(card);
 900                 if (err)
 901                         goto free_card;
 902         }
 903
 904         /*
 905          * Select card, as all following commands rely on that.
 906          */
 907         if (!mmc_host_is_spi(host)) {
 908                 err = mmc_select_card(card);
 909                 if (err)
 910                         goto free_card;
 911         }
 912
 913         if (!oldcard) {
 914                 /*
 915                  * Fetch and process extended CSD.
 916                  */
 917
 918                 err = mmc_get_ext_csd(card, &ext_csd);
 919                 if (err)
 920                         goto free_card;
 921                 err = mmc_read_ext_csd(card, ext_csd);
 922                 if (err)
 923                         goto free_card;
 924
 925                 /* If doing byte addressing, check if required to do sector
 926                  * addressing.  Handle the case of <2GB cards needing sector
 927                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 928                  * ocr register has bit 30 set for sector addressing.
 929                  */
 930                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 931                         mmc_card_set_blockaddr(card);
 932
 933                 /* Erase size depends on CSD and Extended CSD */
 934                 mmc_set_erase_size(card);
 935         }
 936
 937         /*
 938          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 939          * bit.  This bit will be lost every time after a reset or power off.
 940          */
 941         if (card->ext_csd.enhanced_area_en) {
 942                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 943                                  EXT_CSD_ERASE_GROUP_DEF, 1,
 944                                  card->ext_csd.generic_cmd6_time);
 945
 946                 if (err && err != -EBADMSG)
 947                         goto free_card;
 948
 949                 if (err) {
 950                         err = 0;
 951                         /*
 952                          * Just disable enhanced area off & sz
 953                          * will try to enable ERASE_GROUP_DEF
 954                          * during next time reinit
 955                          */
 956                         card->ext_csd.enhanced_area_offset = -EINVAL;
 957                         card->ext_csd.enhanced_area_size = -EINVAL;
 958                 } else {
 959                         card->ext_csd.erase_group_def = 1;
 960                         /*
 961                          * enable ERASE_GRP_DEF successfully.
 962                          * This will affect the erase size, so
 963                          * here need to reset erase size
 964                          */
 965                         mmc_set_erase_size(card);
 966                 }
 967         }
 968
 969         /*
 970          * Ensure eMMC user default partition is enabled
 971          */
 972         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
 973                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 974                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
 975                                  card->ext_csd.part_config,
 976                                  card->ext_csd.part_time);
 977                 if (err && err != -EBADMSG)
 978                         goto free_card;
 979         }
 980
 981         /*
 982          * If the host supports the power_off_notify capability then
 983          * set the notification byte in the ext_csd register of device
 984          */
 985         if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
 986             (card->ext_csd.rev >= 6)) {
 987                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 988                                  EXT_CSD_POWER_OFF_NOTIFICATION,
 989                                  EXT_CSD_POWER_ON,
 990                                  card->ext_csd.generic_cmd6_time);
 991                 if (err && err != -EBADMSG)
 992                         goto free_card;
 993
 994                 /*
 995                  * The err can be -EBADMSG or 0,
 996                  * so check for success and update the flag
 997                  */
 998                 if (!err)
 999                         card->poweroff_notify_state = MMC_POWERED_ON;
1000         }
1001
1002         /*
1003          * Activate high speed (if supported)
1004          */
1005         if (card->ext_csd.hs_max_dtr != 0) {
1006                 err = 0;
1007                 if (card->ext_csd.hs_max_dtr > 52000000 &&
1008                     host->caps2 & MMC_CAP2_HS200)
1009                         err = mmc_select_hs200(card);
1010                 else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
1011                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1012                                          EXT_CSD_HS_TIMING, 1,
1013                                          card->ext_csd.generic_cmd6_time);
1014
1015                 if (err && err != -EBADMSG)
1016                         goto free_card;
1017
1018                 if (err) {
1019                         pr_warning("%s: switch to highspeed failed\n",
1020                                mmc_hostname(card->host));
1021                         err = 0;
1022                 } else {
1023                         if (card->ext_csd.hs_max_dtr > 52000000 &&
1024                             host->caps2 & MMC_CAP2_HS200) {
1025                                 mmc_card_set_hs200(card);
1026                                 mmc_set_timing(card->host,
1027                                                MMC_TIMING_MMC_HS200);
1028                         } else {
1029                                 mmc_card_set_highspeed(card);
1030                                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1031                         }
1032                 }
1033         }
1034
1035         /*
1036          * Enable HPI feature (if supported)
1037          */
1038         if (card->ext_csd.hpi) {
1039                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1040                         EXT_CSD_HPI_MGMT, 1, 0);
1041                 if (err && err != -EBADMSG)
1042                         goto free_card;
1043                 if (err) {
1044                         pr_warning("%s: Enabling HPI failed\n",
1045                                    mmc_hostname(card->host));
1046                         err = 0;
1047                 } else
1048                         card->ext_csd.hpi_en = 1;
1049         }
1050
1051         /*
1052          * Compute bus speed.
1053          */
1054         max_dtr = (unsigned int)-1;
1055
1056         if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
1057                 if (max_dtr > card->ext_csd.hs_max_dtr)
1058                         max_dtr = card->ext_csd.hs_max_dtr;
1059         } else if (max_dtr > card->csd.max_dtr) {
1060                 max_dtr = card->csd.max_dtr;
1061         }
1062
1063         mmc_set_clock(host, max_dtr);
1064
1065         /*
1066          * Indicate DDR mode (if supported).
1067          */
1068         if (mmc_card_highspeed(card)) {
1069                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
1070                         && ((host->caps & (MMC_CAP_1_8V_DDR |
1071                              MMC_CAP_UHS_DDR50))
1072                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
1073                                 ddr = MMC_1_8V_DDR_MODE;
1074                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1075                         && ((host->caps & (MMC_CAP_1_2V_DDR |
1076                              MMC_CAP_UHS_DDR50))
1077                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
1078                                 ddr = MMC_1_2V_DDR_MODE;
1079         }
1080
1081         /*
1082          * Indicate HS200 SDR mode (if supported).
1083          */
1084         if (mmc_card_hs200(card)) {
1085                 u32 ext_csd_bits;
1086                 u32 bus_width = card->host->ios.bus_width;
1087
1088                 /*
1089                  * For devices supporting HS200 mode, the bus width has
1090                  * to be set before executing the tuning function. If
1091                  * set before tuning, then device will respond with CRC
1092                  * errors for responses on CMD line. So for HS200 the
1093                  * sequence will be
1094                  * 1. set bus width 4bit / 8 bit (1 bit not supported)
1095                  * 2. switch to HS200 mode
1096                  * 3. set the clock to > 52Mhz <=200MHz and
1097                  * 4. execute tuning for HS200
1098                  */
1099                 if ((host->caps2 & MMC_CAP2_HS200) &&
1100                     card->host->ops->execute_tuning)
1101                         err = card->host->ops->execute_tuning(card->host,
1102                                 MMC_SEND_TUNING_BLOCK_HS200);
1103                 if (err) {
1104                         pr_warning("%s: tuning execution failed\n",
1105                                    mmc_hostname(card->host));
1106                         goto err;
1107                 }
1108
1109                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1110                                 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
1111                 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
1112                 if (err) {
1113                         pr_err("%s: power class selection to bus width %d failed\n",
1114                                 mmc_hostname(card->host), 1 << bus_width);
1115                         goto err;
1116                 }
1117         }
1118
1119         /*
1120          * Activate wide bus and DDR (if supported).
1121          */
1122         if (!mmc_card_hs200(card) &&
1123             (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
1124             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
1125                 static unsigned ext_csd_bits[][2] = {
1126                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
1127                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
1128                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
1129                 };
1130                 static unsigned bus_widths[] = {
1131                         MMC_BUS_WIDTH_8,
1132                         MMC_BUS_WIDTH_4,
1133                         MMC_BUS_WIDTH_1
1134                 };
1135                 unsigned idx, bus_width = 0;
1136
1137                 if (host->caps & MMC_CAP_8_BIT_DATA)
1138                         idx = 0;
1139                 else
1140                         idx = 1;
1141                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1142                         bus_width = bus_widths[idx];
1143                         if (bus_width == MMC_BUS_WIDTH_1)
1144                                 ddr = 0; /* no DDR for 1-bit width */
1145                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
1146                                                     ext_csd);
1147                         if (err)
1148                                 pr_err("%s: power class selection to "
1149                                        "bus width %d failed\n",
1150                                        mmc_hostname(card->host),
1151                                        1 << bus_width);
1152
1153                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1154                                          EXT_CSD_BUS_WIDTH,
1155                                          ext_csd_bits[idx][0],
1156                                          card->ext_csd.generic_cmd6_time);
1157                         if (!err) {
1158                                 mmc_set_bus_width(card->host, bus_width);
1159
1160                                 /*
1161                                  * If controller can't handle bus width test,
1162                                  * compare ext_csd previously read in 1 bit mode
1163                                  * against ext_csd at new bus width
1164                                  */
1165                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1166                                         err = mmc_compare_ext_csds(card,
1167                                                 bus_width);
1168                                 else
1169                                         err = mmc_bus_test(card, bus_width);
1170                                 if (!err)
1171                                         break;
1172                         }
1173                 }
1174
1175                 if (!err && ddr) {
1176                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1177                                                     ext_csd);
1178                         if (err)
1179                                 pr_err("%s: power class selection to "
1180                                        "bus width %d ddr %d failed\n",
1181                                        mmc_hostname(card->host),
1182                                        1 << bus_width, ddr);
1183
1184                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1185                                          EXT_CSD_BUS_WIDTH,
1186                                          ext_csd_bits[idx][1],
1187                                          card->ext_csd.generic_cmd6_time);
1188                 }
1189                 if (err) {
1190                         pr_warning("%s: switch to bus width %d ddr %d "
1191                                 "failed\n", mmc_hostname(card->host),
1192                                 1 << bus_width, ddr);
1193                         goto free_card;
1194                 } else if (ddr) {
1195                         /*
1196                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1197                          * signaling.
1198                          *
1199                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1200                          *
1201                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1202                          * in the JEDEC spec for DDR.
1203                          *
1204                          * Do not force change in vccq since we are obviously
1205                          * working and no change to vccq is needed.
1206                          *
1207                          * WARNING: eMMC rules are NOT the same as SD DDR
1208                          */
1209                         if (ddr == MMC_1_2V_DDR_MODE) {
1210                                 err = mmc_set_signal_voltage(host,
1211                                         MMC_SIGNAL_VOLTAGE_120, 0);
1212                                 if (err)
1213                                         goto err;
1214                         }
1215                         mmc_card_set_ddr_mode(card);
1216                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1217                         mmc_set_bus_width(card->host, bus_width);
1218                 }
1219         }
1220
1221         /*
1222          * If cache size is higher than 0, this indicates
1223          * the existence of cache and it can be turned on.
1224          */
1225         if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1226                         card->ext_csd.cache_size > 0) {
1227                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1228                                 EXT_CSD_CACHE_CTRL, 1,
1229                                 card->ext_csd.generic_cmd6_time);
1230                 if (err && err != -EBADMSG)
1231                         goto free_card;
1232
1233                 /*
1234                  * Only if no error, cache is turned on successfully.
1235                  */
1236                 if (err) {
1237                         pr_warning("%s: Cache is supported, "
1238                                         "but failed to turn on (%d)\n",
1239                                         mmc_hostname(card->host), err);
1240                         card->ext_csd.cache_ctrl = 0;
1241                         err = 0;
1242                 } else {
1243                         card->ext_csd.cache_ctrl = 1;
1244                 }
1245         }
1246
1247         if (!oldcard)
1248                 host->card = card;
1249
1250         mmc_free_ext_csd(ext_csd);
1251         return 0;
1252
1253 free_card:
1254         if (!oldcard)
1255                 mmc_remove_card(card);
1256 err:
1257         mmc_free_ext_csd(ext_csd);
1258
1259         return err;
1260 }
1261
1262 /*
1263  * Host is being removed. Free up the current card.
1264  */
1265 static void mmc_remove(struct mmc_host *host)
1266 {
1267         BUG_ON(!host);
1268         BUG_ON(!host->card);
1269
1270         mmc_remove_card(host->card);
1271         host->card = NULL;
1272 }
1273
1274 /*
1275  * Card detection - card is alive.
1276  */
1277 static int mmc_alive(struct mmc_host *host)
1278 {
1279         return mmc_send_status(host->card, NULL);
1280 }
1281
1282 /*
1283  * Card detection callback from host.
1284  */
1285 static void mmc_detect(struct mmc_host *host)
1286 {
1287         int err;
1288
1289         BUG_ON(!host);
1290         BUG_ON(!host->card);
1291
1292         mmc_claim_host(host);
1293
1294         /*
1295          * Just check if our card has been removed.
1296          */
1297         err = _mmc_detect_card_removed(host);
1298
1299         mmc_release_host(host);
1300
1301         if (err) {
1302                 mmc_remove(host);
1303
1304                 mmc_claim_host(host);
1305                 mmc_detach_bus(host);
1306                 mmc_power_off(host);
1307                 mmc_release_host(host);
1308         }
1309 }
1310
1311 /*
1312  * Suspend callback from host.
1313  */
1314 static int mmc_suspend(struct mmc_host *host)
1315 {
1316         int err = 0;
1317
1318         BUG_ON(!host);
1319         BUG_ON(!host->card);
1320
1321         mmc_claim_host(host);
1322         if (mmc_card_can_sleep(host)) {
1323                 err = mmc_card_sleep(host);
1324                 if (!err)
1325                         mmc_card_set_sleep(host->card);
1326         } else if (!mmc_host_is_spi(host))
1327                 mmc_deselect_cards(host);
1328         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1329         mmc_release_host(host);
1330
1331         return err;
1332 }
1333
1334 /*
1335  * Resume callback from host.
1336  *
1337  * This function tries to determine if the same card is still present
1338  * and, if so, restore all state to it.
1339  */
1340 static int mmc_resume(struct mmc_host *host)
1341 {
1342         int err;
1343
1344         BUG_ON(!host);
1345         BUG_ON(!host->card);
1346
1347         mmc_claim_host(host);
1348         if (mmc_card_is_sleep(host->card)) {
1349                 err = mmc_card_awake(host);
1350                 mmc_card_clr_sleep(host->card);
1351         } else
1352                 err = mmc_init_card(host, host->ocr, host->card);
1353         mmc_release_host(host);
1354
1355         return err;
1356 }
1357
1358 static int mmc_power_restore(struct mmc_host *host)
1359 {
1360         int ret;
1361
1362         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1363         mmc_card_clr_sleep(host->card);
1364         mmc_claim_host(host);
1365         ret = mmc_init_card(host, host->ocr, host->card);
1366         mmc_release_host(host);
1367
1368         return ret;
1369 }
1370
1371 static int mmc_sleep(struct mmc_host *host)
1372 {
1373         struct mmc_card *card = host->card;
1374         int err = -ENOSYS;
1375
1376         if (card && card->ext_csd.rev >= 3) {
1377                 err = mmc_card_sleepawake(host, 1);
1378                 if (err < 0)
1379                         pr_debug("%s: Error %d while putting card into sleep",
1380                                  mmc_hostname(host), err);
1381         }
1382
1383         return err;
1384 }
1385
1386 static int mmc_awake(struct mmc_host *host)
1387 {
1388         struct mmc_card *card = host->card;
1389         int err = -ENOSYS;
1390
1391         if (card && card->ext_csd.rev >= 3) {
1392                 err = mmc_card_sleepawake(host, 0);
1393                 if (err < 0)
1394                         pr_debug("%s: Error %d while awaking sleeping card",
1395                                  mmc_hostname(host), err);
1396         }
1397
1398         return err;
1399 }
1400
1401 static const struct mmc_bus_ops mmc_ops = {
1402         .awake = mmc_awake,
1403         .sleep = mmc_sleep,
1404         .remove = mmc_remove,
1405         .detect = mmc_detect,
1406         .suspend = NULL,
1407         .resume = NULL,
1408         .power_restore = mmc_power_restore,
1409         .alive = mmc_alive,
1410 };
1411
1412 static const struct mmc_bus_ops mmc_ops_unsafe = {
1413         .awake = mmc_awake,
1414         .sleep = mmc_sleep,
1415         .remove = mmc_remove,
1416         .detect = mmc_detect,
1417         .suspend = mmc_suspend,
1418         .resume = mmc_resume,
1419         .power_restore = mmc_power_restore,
1420         .alive = mmc_alive,
1421 };
1422
1423 static void mmc_attach_bus_ops(struct mmc_host *host)
1424 {
1425         const struct mmc_bus_ops *bus_ops;
1426
1427         if (!mmc_card_is_removable(host))
1428                 bus_ops = &mmc_ops_unsafe;
1429         else
1430                 bus_ops = &mmc_ops;
1431         mmc_attach_bus(host, bus_ops);
1432 }
1433
1434 /*
1435  * Starting point for MMC card init.
1436  */
1437 int mmc_attach_mmc(struct mmc_host *host)
1438 {
1439         int err;
1440         u32 ocr;
1441
1442         BUG_ON(!host);
1443         WARN_ON(!host->claimed);
1444
1445         /* Set correct bus mode for MMC before attempting attach */
1446         if (!mmc_host_is_spi(host))
1447                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1448
1449         err = mmc_send_op_cond(host, 0, &ocr);
1450         if (err)
1451                 return err;
1452
1453         mmc_attach_bus_ops(host);
1454         if (host->ocr_avail_mmc)
1455                 host->ocr_avail = host->ocr_avail_mmc;
1456
1457         /*
1458          * We need to get OCR a different way for SPI.
1459          */
1460         if (mmc_host_is_spi(host)) {
1461                 err = mmc_spi_read_ocr(host, 1, &ocr);
1462                 if (err)
1463                         goto err;
1464         }
1465
1466         /*
1467          * Sanity check the voltages that the card claims to
1468          * support.
1469          */
1470         if (ocr & 0x7F) {
1471                 pr_warning("%s: card claims to support voltages "
1472                        "below the defined range. These will be ignored.\n",
1473                        mmc_hostname(host));
1474                 ocr &= ~0x7F;
1475         }
1476
1477         host->ocr = mmc_select_voltage(host, ocr);
1478
1479         /*
1480          * Can we support the voltage of the card?
1481          */
1482         if (!host->ocr) {
1483                 err = -EINVAL;
1484                 goto err;
1485         }
1486
1487         /*
1488          * Detect and init the card.
1489          */
1490         err = mmc_init_card(host, host->ocr, NULL);
1491         if (err)
1492                 goto err;
1493
1494         mmc_release_host(host);
1495         err = mmc_add_card(host->card);
1496         mmc_claim_host(host);
1497         if (err)
1498                 goto remove_card;
1499
1500         return 0;
1501
1502 remove_card:
1503         mmc_release_host(host);
1504         mmc_remove_card(host->card);
1505         mmc_claim_host(host);
1506         host->card = NULL;
1507 err:
1508         mmc_detach_bus(host);
1509
1510         pr_err("%s: error %d whilst initialising MMC card\n",
1511                 mmc_hostname(host), err);
1512
1513         return err;
1514 }