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.prv           = UNSTUFF_BITS(resp, 48, 8);
 100                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 101                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 102                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 103                 break;
 104
 105         default:
 106                 pr_err("%s: card has unknown MMCA version %d\n",
 107                         mmc_hostname(card->host), card->csd.mmca_vsn);
 108                 return -EINVAL;
 109         }
 110
 111         return 0;
 112 }
 113
 114 static void mmc_set_erase_size(struct mmc_card *card)
 115 {
 116         if (card->ext_csd.erase_group_def & 1)
 117                 card->erase_size = card->ext_csd.hc_erase_size;
 118         else
 119                 card->erase_size = card->csd.erase_size;
 120
 121         mmc_init_erase(card);
 122 }
 123
 124 /*
 125  * Given a 128-bit response, decode to our card CSD structure.
 126  */
 127 static int mmc_decode_csd(struct mmc_card *card)
 128 {
 129         struct mmc_csd *csd = &card->csd;
 130         unsigned int e, m, a, b;
 131         u32 *resp = card->raw_csd;
 132
 133         /*
 134          * We only understand CSD structure v1.1 and v1.2.
 135          * v1.2 has extra information in bits 15, 11 and 10.
 136          * We also support eMMC v4.4 & v4.41.
 137          */
 138         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 139         if (csd->structure == 0) {
 140                 pr_err("%s: unrecognised CSD structure version %d\n",
 141                         mmc_hostname(card->host), csd->structure);
 142                 return -EINVAL;
 143         }
 144
 145         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 146         m = UNSTUFF_BITS(resp, 115, 4);
 147         e = UNSTUFF_BITS(resp, 112, 3);
 148         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 149         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 150
 151         m = UNSTUFF_BITS(resp, 99, 4);
 152         e = UNSTUFF_BITS(resp, 96, 3);
 153         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 154         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 155
 156         e = UNSTUFF_BITS(resp, 47, 3);
 157         m = UNSTUFF_BITS(resp, 62, 12);
 158         csd->capacity     = (1 + m) << (e + 2);
 159
 160         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 161         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 162         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 163         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 164         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 165         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 166         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 167
 168         if (csd->write_blkbits >= 9) {
 169                 a = UNSTUFF_BITS(resp, 42, 5);
 170                 b = UNSTUFF_BITS(resp, 37, 5);
 171                 csd->erase_size = (a + 1) * (b + 1);
 172                 csd->erase_size <<= csd->write_blkbits - 9;
 173         }
 174
 175         return 0;
 176 }
 177
 178 /*
 179  * Read extended CSD.
 180  */
 181 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
 182 {
 183         int err;
 184         u8 *ext_csd;
 185
 186         BUG_ON(!card);
 187         BUG_ON(!new_ext_csd);
 188
 189         *new_ext_csd = NULL;
 190
 191         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 192                 return 0;
 193
 194         /*
 195          * As the ext_csd is so large and mostly unused, we don't store the
 196          * raw block in mmc_card.
 197          */
 198         ext_csd = kmalloc(512, GFP_KERNEL);
 199         if (!ext_csd) {
 200                 pr_err("%s: could not allocate a buffer to "
 201                         "receive the ext_csd.\n", mmc_hostname(card->host));
 202                 return -ENOMEM;
 203         }
 204
 205         err = mmc_send_ext_csd(card, ext_csd);
 206         if (err) {
 207                 kfree(ext_csd);
 208                 *new_ext_csd = NULL;
 209
 210                 /* If the host or the card can't do the switch,
 211                  * fail more gracefully. */
 212                 if ((err != -EINVAL)
 213                  && (err != -ENOSYS)
 214                  && (err != -EFAULT))
 215                         return err;
 216
 217                 /*
 218                  * High capacity cards should have this "magic" size
 219                  * stored in their CSD.
 220                  */
 221                 if (card->csd.capacity == (4096 * 512)) {
 222                         pr_err("%s: unable to read EXT_CSD "
 223                                 "on a possible high capacity card. "
 224                                 "Card will be ignored.\n",
 225                                 mmc_hostname(card->host));
 226                 } else {
 227                         pr_warning("%s: unable to read "
 228                                 "EXT_CSD, performance might "
 229                                 "suffer.\n",
 230                                 mmc_hostname(card->host));
 231                         err = 0;
 232                 }
 233         } else
 234                 *new_ext_csd = ext_csd;
 235
 236         return err;
 237 }
 238
 239 static void mmc_select_card_type(struct mmc_card *card)
 240 {
 241         struct mmc_host *host = card->host;
 242         u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK;
 243         u32 caps = host->caps, caps2 = host->caps2;
 244         unsigned int hs_max_dtr = 0;
 245
 246         if (card_type & EXT_CSD_CARD_TYPE_26)
 247                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
 248
 249         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 250                         card_type & EXT_CSD_CARD_TYPE_52)
 251                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
 252
 253         if ((caps & MMC_CAP_1_8V_DDR &&
 254                         card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) ||
 255             (caps & MMC_CAP_1_2V_DDR &&
 256                         card_type & EXT_CSD_CARD_TYPE_DDR_1_2V))
 257                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 258
 259         if ((caps2 & MMC_CAP2_HS200_1_8V_SDR &&
 260                         card_type & EXT_CSD_CARD_TYPE_SDR_1_8V) ||
 261             (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
 262                         card_type & EXT_CSD_CARD_TYPE_SDR_1_2V))
 263                 hs_max_dtr = MMC_HS200_MAX_DTR;
 264
 265         card->ext_csd.hs_max_dtr = hs_max_dtr;
 266         card->ext_csd.card_type = card_type;
 267 }
 268
 269 /*
 270  * Decode extended CSD.
 271  */
 272 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 273 {
 274         int err = 0, idx;
 275         unsigned int part_size;
 276         u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
 277
 278         BUG_ON(!card);
 279
 280         if (!ext_csd)
 281                 return 0;
 282
 283         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 284         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 285         if (card->csd.structure == 3) {
 286                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 287                         pr_err("%s: unrecognised EXT_CSD structure "
 288                                 "version %d\n", mmc_hostname(card->host),
 289                                         card->ext_csd.raw_ext_csd_structure);
 290                         err = -EINVAL;
 291                         goto out;
 292                 }
 293         }
 294
 295         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 296         if (card->ext_csd.rev > 6) {
 297                 pr_err("%s: unrecognised EXT_CSD revision %d\n",
 298                         mmc_hostname(card->host), card->ext_csd.rev);
 299                 err = -EINVAL;
 300                 goto out;
 301         }
 302
 303         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 304         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 305         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 306         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 307         if (card->ext_csd.rev >= 2) {
 308                 card->ext_csd.sectors =
 309                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 310                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 311                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 312                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 313
 314                 /* Cards with density > 2GiB are sector addressed */
 315                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 316                         mmc_card_set_blockaddr(card);
 317         }
 318
 319         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 320         mmc_select_card_type(card);
 321
 322         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 323         card->ext_csd.raw_erase_timeout_mult =
 324                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 325         card->ext_csd.raw_hc_erase_grp_size =
 326                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 327         if (card->ext_csd.rev >= 3) {
 328                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 329                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 330
 331                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 332                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 333
 334                 /* Sleep / awake timeout in 100ns units */
 335                 if (sa_shift > 0 && sa_shift <= 0x17)
 336                         card->ext_csd.sa_timeout =
 337                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 338                 card->ext_csd.erase_group_def =
 339                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 340                 card->ext_csd.hc_erase_timeout = 300 *
 341                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 342                 card->ext_csd.hc_erase_size =
 343                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 344
 345                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 346
 347                 /*
 348                  * There are two boot regions of equal size, defined in
 349                  * multiples of 128K.
 350                  */
 351                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 352                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 353                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 354                                 mmc_part_add(card, part_size,
 355                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 356                                         "boot%d", idx, true,
 357                                         MMC_BLK_DATA_AREA_BOOT);
 358                         }
 359                 }
 360         }
 361
 362         card->ext_csd.raw_hc_erase_gap_size =
 363                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 364         card->ext_csd.raw_sec_trim_mult =
 365                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 366         card->ext_csd.raw_sec_erase_mult =
 367                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 368         card->ext_csd.raw_sec_feature_support =
 369                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 370         card->ext_csd.raw_trim_mult =
 371                 ext_csd[EXT_CSD_TRIM_MULT];
 372         card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 373         if (card->ext_csd.rev >= 4) {
 374                 /*
 375                  * Enhanced area feature support -- check whether the eMMC
 376                  * card has the Enhanced area enabled.  If so, export enhanced
 377                  * area offset and size to user by adding sysfs interface.
 378                  */
 379                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 380                     (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 381                         hc_erase_grp_sz =
 382                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 383                         hc_wp_grp_sz =
 384                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 385
 386                         card->ext_csd.enhanced_area_en = 1;
 387                         /*
 388                          * calculate the enhanced data area offset, in bytes
 389                          */
 390                         card->ext_csd.enhanced_area_offset =
 391                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
 392                                 (ext_csd[137] << 8) + ext_csd[136];
 393                         if (mmc_card_blockaddr(card))
 394                                 card->ext_csd.enhanced_area_offset <<= 9;
 395                         /*
 396                          * calculate the enhanced data area size, in kilobytes
 397                          */
 398                         card->ext_csd.enhanced_area_size =
 399                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 400                                 ext_csd[140];
 401                         card->ext_csd.enhanced_area_size *=
 402                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 403                         card->ext_csd.enhanced_area_size <<= 9;
 404                 } else {
 405                         /*
 406                          * If the enhanced area is not enabled, disable these
 407                          * device attributes.
 408                          */
 409                         card->ext_csd.enhanced_area_offset = -EINVAL;
 410                         card->ext_csd.enhanced_area_size = -EINVAL;
 411                 }
 412
 413                 /*
 414                  * General purpose partition feature support --
 415                  * If ext_csd has the size of general purpose partitions,
 416                  * set size, part_cfg, partition name in mmc_part.
 417                  */
 418                 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 419                         EXT_CSD_PART_SUPPORT_PART_EN) {
 420                         if (card->ext_csd.enhanced_area_en != 1) {
 421                                 hc_erase_grp_sz =
 422                                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 423                                 hc_wp_grp_sz =
 424                                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 425
 426                                 card->ext_csd.enhanced_area_en = 1;
 427                         }
 428
 429                         for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 430                                 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 431                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 432                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 433                                         continue;
 434                                 part_size =
 435                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 436                                         << 16) +
 437                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 438                                         << 8) +
 439                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 440                                 part_size *= (size_t)(hc_erase_grp_sz *
 441                                         hc_wp_grp_sz);
 442                                 mmc_part_add(card, part_size << 19,
 443                                         EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 444                                         "gp%d", idx, false,
 445                                         MMC_BLK_DATA_AREA_GP);
 446                         }
 447                 }
 448                 card->ext_csd.sec_trim_mult =
 449                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 450                 card->ext_csd.sec_erase_mult =
 451                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 452                 card->ext_csd.sec_feature_support =
 453                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 454                 card->ext_csd.trim_timeout = 300 *
 455                         ext_csd[EXT_CSD_TRIM_MULT];
 456
 457                 /*
 458                  * Note that the call to mmc_part_add above defaults to read
 459                  * only. If this default assumption is changed, the call must
 460                  * take into account the value of boot_locked below.
 461                  */
 462                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 463                 card->ext_csd.boot_ro_lockable = true;
 464         }
 465
 466         if (card->ext_csd.rev >= 5) {
 467                 /* check whether the eMMC card supports BKOPS */
 468                 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
 469                         card->ext_csd.bkops = 1;
 470                         card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN];
 471                         card->ext_csd.raw_bkops_status =
 472                                 ext_csd[EXT_CSD_BKOPS_STATUS];
 473                         if (!card->ext_csd.bkops_en)
 474                                 pr_info("%s: BKOPS_EN bit is not set\n",
 475                                         mmc_hostname(card->host));
 476                 }
 477
 478                 /* check whether the eMMC card supports HPI */
 479                 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
 480                         card->ext_csd.hpi = 1;
 481                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 482                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 483                         else
 484                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 485                         /*
 486                          * Indicate the maximum timeout to close
 487                          * a command interrupted by HPI
 488                          */
 489                         card->ext_csd.out_of_int_time =
 490                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 491                 }
 492
 493                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 494                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 495
 496                 /*
 497                  * RPMB regions are defined in multiples of 128K.
 498                  */
 499                 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
 500                 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
 501                         mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
 502                                 EXT_CSD_PART_CONFIG_ACC_RPMB,
 503                                 "rpmb", 0, false,
 504                                 MMC_BLK_DATA_AREA_RPMB);
 505                 }
 506         }
 507
 508         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 509         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 510                 card->erased_byte = 0xFF;
 511         else
 512                 card->erased_byte = 0x0;
 513
 514         /* eMMC v4.5 or later */
 515         if (card->ext_csd.rev >= 6) {
 516                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 517
 518                 card->ext_csd.generic_cmd6_time = 10 *
 519                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 520                 card->ext_csd.power_off_longtime = 10 *
 521                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 522
 523                 card->ext_csd.cache_size =
 524                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 525                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 526                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 527                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 528
 529                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 530                         card->ext_csd.data_sector_size = 4096;
 531                 else
 532                         card->ext_csd.data_sector_size = 512;
 533
 534                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 535                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 536                         card->ext_csd.data_tag_unit_size =
 537                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 538                         (card->ext_csd.data_sector_size);
 539                 } else {
 540                         card->ext_csd.data_tag_unit_size = 0;
 541                 }
 542
 543                 card->ext_csd.max_packed_writes =
 544                         ext_csd[EXT_CSD_MAX_PACKED_WRITES];
 545                 card->ext_csd.max_packed_reads =
 546                         ext_csd[EXT_CSD_MAX_PACKED_READS];
 547         } else {
 548                 card->ext_csd.data_sector_size = 512;
 549         }
 550
 551 out:
 552         return err;
 553 }
 554
 555 static inline void mmc_free_ext_csd(u8 *ext_csd)
 556 {
 557         kfree(ext_csd);
 558 }
 559
 560
 561 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 562 {
 563         u8 *bw_ext_csd;
 564         int err;
 565
 566         if (bus_width == MMC_BUS_WIDTH_1)
 567                 return 0;
 568
 569         err = mmc_get_ext_csd(card, &bw_ext_csd);
 570
 571         if (err || bw_ext_csd == NULL) {
 572                 err = -EINVAL;
 573                 goto out;
 574         }
 575
 576         /* only compare read only fields */
 577         err = !((card->ext_csd.raw_partition_support ==
 578                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 579                 (card->ext_csd.raw_erased_mem_count ==
 580                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 581                 (card->ext_csd.rev ==
 582                         bw_ext_csd[EXT_CSD_REV]) &&
 583                 (card->ext_csd.raw_ext_csd_structure ==
 584                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 585                 (card->ext_csd.raw_card_type ==
 586                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 587                 (card->ext_csd.raw_s_a_timeout ==
 588                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 589                 (card->ext_csd.raw_hc_erase_gap_size ==
 590                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 591                 (card->ext_csd.raw_erase_timeout_mult ==
 592                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 593                 (card->ext_csd.raw_hc_erase_grp_size ==
 594                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 595                 (card->ext_csd.raw_sec_trim_mult ==
 596                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 597                 (card->ext_csd.raw_sec_erase_mult ==
 598                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 599                 (card->ext_csd.raw_sec_feature_support ==
 600                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 601                 (card->ext_csd.raw_trim_mult ==
 602                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 603                 (card->ext_csd.raw_sectors[0] ==
 604                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 605                 (card->ext_csd.raw_sectors[1] ==
 606                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 607                 (card->ext_csd.raw_sectors[2] ==
 608                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 609                 (card->ext_csd.raw_sectors[3] ==
 610                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
 611         if (err)
 612                 err = -EINVAL;
 613
 614 out:
 615         mmc_free_ext_csd(bw_ext_csd);
 616         return err;
 617 }
 618
 619 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 620         card->raw_cid[2], card->raw_cid[3]);
 621 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 622         card->raw_csd[2], card->raw_csd[3]);
 623 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 624 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 625 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 626 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 627 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 628 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 629 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 630 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 631 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
 632 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 633 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 634                 card->ext_csd.enhanced_area_offset);
 635 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 636 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
 637 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
 638
 639 static struct attribute *mmc_std_attrs[] = {
 640         &dev_attr_cid.attr,
 641         &dev_attr_csd.attr,
 642         &dev_attr_date.attr,
 643         &dev_attr_erase_size.attr,
 644         &dev_attr_preferred_erase_size.attr,
 645         &dev_attr_fwrev.attr,
 646         &dev_attr_hwrev.attr,
 647         &dev_attr_manfid.attr,
 648         &dev_attr_name.attr,
 649         &dev_attr_oemid.attr,
 650         &dev_attr_prv.attr,
 651         &dev_attr_serial.attr,
 652         &dev_attr_enhanced_area_offset.attr,
 653         &dev_attr_enhanced_area_size.attr,
 654         &dev_attr_raw_rpmb_size_mult.attr,
 655         &dev_attr_rel_sectors.attr,
 656         NULL,
 657 };
 658
 659 static struct attribute_group mmc_std_attr_group = {
 660         .attrs = mmc_std_attrs,
 661 };
 662
 663 static const struct attribute_group *mmc_attr_groups[] = {
 664         &mmc_std_attr_group,
 665         NULL,
 666 };
 667
 668 static struct device_type mmc_type = {
 669         .groups = mmc_attr_groups,
 670 };
 671
 672 /*
 673  * Select the PowerClass for the current bus width
 674  * If power class is defined for 4/8 bit bus in the
 675  * extended CSD register, select it by executing the
 676  * mmc_switch command.
 677  */
 678 static int mmc_select_powerclass(struct mmc_card *card,
 679                 unsigned int bus_width, u8 *ext_csd)
 680 {
 681         int err = 0;
 682         unsigned int pwrclass_val;
 683         unsigned int index = 0;
 684         struct mmc_host *host;
 685
 686         BUG_ON(!card);
 687
 688         host = card->host;
 689         BUG_ON(!host);
 690
 691         if (ext_csd == NULL)
 692                 return 0;
 693
 694         /* Power class selection is supported for versions >= 4.0 */
 695         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 696                 return 0;
 697
 698         /* Power class values are defined only for 4/8 bit bus */
 699         if (bus_width == EXT_CSD_BUS_WIDTH_1)
 700                 return 0;
 701
 702         switch (1 << host->ios.vdd) {
 703         case MMC_VDD_165_195:
 704                 if (host->ios.clock <= 26000000)
 705                         index = EXT_CSD_PWR_CL_26_195;
 706                 else if (host->ios.clock <= 52000000)
 707                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 708                                 EXT_CSD_PWR_CL_52_195 :
 709                                 EXT_CSD_PWR_CL_DDR_52_195;
 710                 else if (host->ios.clock <= 200000000)
 711                         index = EXT_CSD_PWR_CL_200_195;
 712                 break;
 713         case MMC_VDD_27_28:
 714         case MMC_VDD_28_29:
 715         case MMC_VDD_29_30:
 716         case MMC_VDD_30_31:
 717         case MMC_VDD_31_32:
 718         case MMC_VDD_32_33:
 719         case MMC_VDD_33_34:
 720         case MMC_VDD_34_35:
 721         case MMC_VDD_35_36:
 722                 if (host->ios.clock <= 26000000)
 723                         index = EXT_CSD_PWR_CL_26_360;
 724                 else if (host->ios.clock <= 52000000)
 725                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 726                                 EXT_CSD_PWR_CL_52_360 :
 727                                 EXT_CSD_PWR_CL_DDR_52_360;
 728                 else if (host->ios.clock <= 200000000)
 729                         index = EXT_CSD_PWR_CL_200_360;
 730                 break;
 731         default:
 732                 pr_warning("%s: Voltage range not supported "
 733                            "for power class.\n", mmc_hostname(host));
 734                 return -EINVAL;
 735         }
 736
 737         pwrclass_val = ext_csd[index];
 738
 739         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 740                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 741                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 742         else
 743                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 744                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 745
 746         /* If the power class is different from the default value */
 747         if (pwrclass_val > 0) {
 748                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 749                                  EXT_CSD_POWER_CLASS,
 750                                  pwrclass_val,
 751                                  card->ext_csd.generic_cmd6_time);
 752         }
 753
 754         return err;
 755 }
 756
 757 /*
 758  * Selects the desired buswidth and switch to the HS200 mode
 759  * if bus width set without error
 760  */
 761 static int mmc_select_hs200(struct mmc_card *card)
 762 {
 763         int idx, err = -EINVAL;
 764         struct mmc_host *host;
 765         static unsigned ext_csd_bits[] = {
 766                 EXT_CSD_BUS_WIDTH_4,
 767                 EXT_CSD_BUS_WIDTH_8,
 768         };
 769         static unsigned bus_widths[] = {
 770                 MMC_BUS_WIDTH_4,
 771                 MMC_BUS_WIDTH_8,
 772         };
 773
 774         BUG_ON(!card);
 775
 776         host = card->host;
 777
 778         if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
 779                         host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
 780                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
 781
 782         if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V &&
 783                         host->caps2 & MMC_CAP2_HS200_1_8V_SDR)
 784                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
 785
 786         /* If fails try again during next card power cycle */
 787         if (err)
 788                 goto err;
 789
 790         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0;
 791
 792         /*
 793          * Unlike SD, MMC cards dont have a configuration register to notify
 794          * supported bus width. So bus test command should be run to identify
 795          * the supported bus width or compare the ext csd values of current
 796          * bus width and ext csd values of 1 bit mode read earlier.
 797          */
 798         for (; idx >= 0; idx--) {
 799
 800                 /*
 801                  * Host is capable of 8bit transfer, then switch
 802                  * the device to work in 8bit transfer mode. If the
 803                  * mmc switch command returns error then switch to
 804                  * 4bit transfer mode. On success set the corresponding
 805                  * bus width on the host.
 806                  */
 807                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 808                                  EXT_CSD_BUS_WIDTH,
 809                                  ext_csd_bits[idx],
 810                                  card->ext_csd.generic_cmd6_time);
 811                 if (err)
 812                         continue;
 813
 814                 mmc_set_bus_width(card->host, bus_widths[idx]);
 815
 816                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 817                         err = mmc_compare_ext_csds(card, bus_widths[idx]);
 818                 else
 819                         err = mmc_bus_test(card, bus_widths[idx]);
 820                 if (!err)
 821                         break;
 822         }
 823
 824         /* switch to HS200 mode if bus width set successfully */
 825         if (!err)
 826                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 827                                  EXT_CSD_HS_TIMING, 2, 0);
 828 err:
 829         return err;
 830 }
 831
 832 /*
 833  * Handle the detection and initialisation of a card.
 834  *
 835  * In the case of a resume, "oldcard" will contain the card
 836  * we're trying to reinitialise.
 837  */
 838 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 839         struct mmc_card *oldcard)
 840 {
 841         struct mmc_card *card;
 842         int err, ddr = 0;
 843         u32 cid[4];
 844         unsigned int max_dtr;
 845         u32 rocr;
 846         u8 *ext_csd = NULL;
 847
 848         BUG_ON(!host);
 849         WARN_ON(!host->claimed);
 850
 851         /* Set correct bus mode for MMC before attempting init */
 852         if (!mmc_host_is_spi(host))
 853                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 854
 855         /*
 856          * Since we're changing the OCR value, we seem to
 857          * need to tell some cards to go back to the idle
 858          * state.  We wait 1ms to give cards time to
 859          * respond.
 860          * mmc_go_idle is needed for eMMC that are asleep
 861          */
 862         mmc_go_idle(host);
 863
 864         /* The extra bit indicates that we support high capacity */
 865         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 866         if (err)
 867                 goto err;
 868
 869         /*
 870          * For SPI, enable CRC as appropriate.
 871          */
 872         if (mmc_host_is_spi(host)) {
 873                 err = mmc_spi_set_crc(host, use_spi_crc);
 874                 if (err)
 875                         goto err;
 876         }
 877
 878         /*
 879          * Fetch CID from card.
 880          */
 881         if (mmc_host_is_spi(host))
 882                 err = mmc_send_cid(host, cid);
 883         else
 884                 err = mmc_all_send_cid(host, cid);
 885         if (err)
 886                 goto err;
 887
 888         if (oldcard) {
 889                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 890                         err = -ENOENT;
 891                         goto err;
 892                 }
 893
 894                 card = oldcard;
 895         } else {
 896                 /*
 897                  * Allocate card structure.
 898                  */
 899                 card = mmc_alloc_card(host, &mmc_type);
 900                 if (IS_ERR(card)) {
 901                         err = PTR_ERR(card);
 902                         goto err;
 903                 }
 904
 905                 card->type = MMC_TYPE_MMC;
 906                 card->rca = 1;
 907                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 908         }
 909
 910         /*
 911          * For native busses:  set card RCA and quit open drain mode.
 912          */
 913         if (!mmc_host_is_spi(host)) {
 914                 err = mmc_set_relative_addr(card);
 915                 if (err)
 916                         goto free_card;
 917
 918                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 919         }
 920
 921         if (!oldcard) {
 922                 /*
 923                  * Fetch CSD from card.
 924                  */
 925                 err = mmc_send_csd(card, card->raw_csd);
 926                 if (err)
 927                         goto free_card;
 928
 929                 err = mmc_decode_csd(card);
 930                 if (err)
 931                         goto free_card;
 932                 err = mmc_decode_cid(card);
 933                 if (err)
 934                         goto free_card;
 935         }
 936
 937         /*
 938          * Select card, as all following commands rely on that.
 939          */
 940         if (!mmc_host_is_spi(host)) {
 941                 err = mmc_select_card(card);
 942                 if (err)
 943                         goto free_card;
 944         }
 945
 946         if (!oldcard) {
 947                 /*
 948                  * Fetch and process extended CSD.
 949                  */
 950
 951                 err = mmc_get_ext_csd(card, &ext_csd);
 952                 if (err)
 953                         goto free_card;
 954                 err = mmc_read_ext_csd(card, ext_csd);
 955                 if (err)
 956                         goto free_card;
 957
 958                 /* If doing byte addressing, check if required to do sector
 959                  * addressing.  Handle the case of <2GB cards needing sector
 960                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 961                  * ocr register has bit 30 set for sector addressing.
 962                  */
 963                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 964                         mmc_card_set_blockaddr(card);
 965
 966                 /* Erase size depends on CSD and Extended CSD */
 967                 mmc_set_erase_size(card);
 968         }
 969
 970         /*
 971          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 972          * bit.  This bit will be lost every time after a reset or power off.
 973          */
 974         if (card->ext_csd.enhanced_area_en ||
 975             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
 976                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 977                                  EXT_CSD_ERASE_GROUP_DEF, 1,
 978                                  card->ext_csd.generic_cmd6_time);
 979
 980                 if (err && err != -EBADMSG)
 981                         goto free_card;
 982
 983                 if (err) {
 984                         err = 0;
 985                         /*
 986                          * Just disable enhanced area off & sz
 987                          * will try to enable ERASE_GROUP_DEF
 988                          * during next time reinit
 989                          */
 990                         card->ext_csd.enhanced_area_offset = -EINVAL;
 991                         card->ext_csd.enhanced_area_size = -EINVAL;
 992                 } else {
 993                         card->ext_csd.erase_group_def = 1;
 994                         /*
 995                          * enable ERASE_GRP_DEF successfully.
 996                          * This will affect the erase size, so
 997                          * here need to reset erase size
 998                          */
 999                         mmc_set_erase_size(card);
1000                 }
1001         }
1002
1003         /*
1004          * Ensure eMMC user default partition is enabled
1005          */
1006         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1007                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1008                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1009                                  card->ext_csd.part_config,
1010                                  card->ext_csd.part_time);
1011                 if (err && err != -EBADMSG)
1012                         goto free_card;
1013         }
1014
1015         /*
1016          * If the host supports the power_off_notify capability then
1017          * set the notification byte in the ext_csd register of device
1018          */
1019         if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
1020             (card->ext_csd.rev >= 6)) {
1021                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1022                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1023                                  EXT_CSD_POWER_ON,
1024                                  card->ext_csd.generic_cmd6_time);
1025                 if (err && err != -EBADMSG)
1026                         goto free_card;
1027
1028                 /*
1029                  * The err can be -EBADMSG or 0,
1030                  * so check for success and update the flag
1031                  */
1032                 if (!err)
1033                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1034         }
1035
1036         /*
1037          * Activate high speed (if supported)
1038          */
1039         if (card->ext_csd.hs_max_dtr != 0) {
1040                 err = 0;
1041                 if (card->ext_csd.hs_max_dtr > 52000000 &&
1042                     host->caps2 & MMC_CAP2_HS200)
1043                         err = mmc_select_hs200(card);
1044                 else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
1045                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1046                                          EXT_CSD_HS_TIMING, 1,
1047                                          card->ext_csd.generic_cmd6_time);
1048
1049                 if (err && err != -EBADMSG)
1050                         goto free_card;
1051
1052                 if (err) {
1053                         pr_warning("%s: switch to highspeed failed\n",
1054                                mmc_hostname(card->host));
1055                         err = 0;
1056                 } else {
1057                         if (card->ext_csd.hs_max_dtr > 52000000 &&
1058                             host->caps2 & MMC_CAP2_HS200) {
1059                                 mmc_card_set_hs200(card);
1060                                 mmc_set_timing(card->host,
1061                                                MMC_TIMING_MMC_HS200);
1062                         } else {
1063                                 mmc_card_set_highspeed(card);
1064                                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1065                         }
1066                 }
1067         }
1068
1069         /*
1070          * Compute bus speed.
1071          */
1072         max_dtr = (unsigned int)-1;
1073
1074         if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
1075                 if (max_dtr > card->ext_csd.hs_max_dtr)
1076                         max_dtr = card->ext_csd.hs_max_dtr;
1077                 if (mmc_card_highspeed(card) && (max_dtr > 52000000))
1078                         max_dtr = 52000000;
1079         } else if (max_dtr > card->csd.max_dtr) {
1080                 max_dtr = card->csd.max_dtr;
1081         }
1082
1083         mmc_set_clock(host, max_dtr);
1084
1085         /*
1086          * Indicate DDR mode (if supported).
1087          */
1088         if (mmc_card_highspeed(card)) {
1089                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
1090                         && ((host->caps & (MMC_CAP_1_8V_DDR |
1091                              MMC_CAP_UHS_DDR50))
1092                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
1093                                 ddr = MMC_1_8V_DDR_MODE;
1094                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1095                         && ((host->caps & (MMC_CAP_1_2V_DDR |
1096                              MMC_CAP_UHS_DDR50))
1097                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
1098                                 ddr = MMC_1_2V_DDR_MODE;
1099         }
1100
1101         /*
1102          * Indicate HS200 SDR mode (if supported).
1103          */
1104         if (mmc_card_hs200(card)) {
1105                 u32 ext_csd_bits;
1106                 u32 bus_width = card->host->ios.bus_width;
1107
1108                 /*
1109                  * For devices supporting HS200 mode, the bus width has
1110                  * to be set before executing the tuning function. If
1111                  * set before tuning, then device will respond with CRC
1112                  * errors for responses on CMD line. So for HS200 the
1113                  * sequence will be
1114                  * 1. set bus width 4bit / 8 bit (1 bit not supported)
1115                  * 2. switch to HS200 mode
1116                  * 3. set the clock to > 52Mhz <=200MHz and
1117                  * 4. execute tuning for HS200
1118                  */
1119                 if ((host->caps2 & MMC_CAP2_HS200) &&
1120                     card->host->ops->execute_tuning) {
1121                         mmc_host_clk_hold(card->host);
1122                         err = card->host->ops->execute_tuning(card->host,
1123                                 MMC_SEND_TUNING_BLOCK_HS200);
1124                         mmc_host_clk_release(card->host);
1125                 }
1126                 if (err) {
1127                         pr_warning("%s: tuning execution failed\n",
1128                                    mmc_hostname(card->host));
1129                         goto err;
1130                 }
1131
1132                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1133                                 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
1134                 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
1135                 if (err)
1136                         pr_warning("%s: power class selection to bus width %d"
1137                                    " failed\n", mmc_hostname(card->host),
1138                                    1 << bus_width);
1139         }
1140
1141         /*
1142          * Activate wide bus and DDR (if supported).
1143          */
1144         if (!mmc_card_hs200(card) &&
1145             (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
1146             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
1147                 static unsigned ext_csd_bits[][2] = {
1148                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
1149                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
1150                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
1151                 };
1152                 static unsigned bus_widths[] = {
1153                         MMC_BUS_WIDTH_8,
1154                         MMC_BUS_WIDTH_4,
1155                         MMC_BUS_WIDTH_1
1156                 };
1157                 unsigned idx, bus_width = 0;
1158
1159                 if (host->caps & MMC_CAP_8_BIT_DATA)
1160                         idx = 0;
1161                 else
1162                         idx = 1;
1163                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1164                         bus_width = bus_widths[idx];
1165                         if (bus_width == MMC_BUS_WIDTH_1)
1166                                 ddr = 0; /* no DDR for 1-bit width */
1167                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
1168                                                     ext_csd);
1169                         if (err)
1170                                 pr_warning("%s: power class selection to "
1171                                            "bus width %d failed\n",
1172                                            mmc_hostname(card->host),
1173                                            1 << bus_width);
1174
1175                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1176                                          EXT_CSD_BUS_WIDTH,
1177                                          ext_csd_bits[idx][0],
1178                                          card->ext_csd.generic_cmd6_time);
1179                         if (!err) {
1180                                 mmc_set_bus_width(card->host, bus_width);
1181
1182                                 /*
1183                                  * If controller can't handle bus width test,
1184                                  * compare ext_csd previously read in 1 bit mode
1185                                  * against ext_csd at new bus width
1186                                  */
1187                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1188                                         err = mmc_compare_ext_csds(card,
1189                                                 bus_width);
1190                                 else
1191                                         err = mmc_bus_test(card, bus_width);
1192                                 if (!err)
1193                                         break;
1194                         }
1195                 }
1196
1197                 if (!err && ddr) {
1198                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1199                                                     ext_csd);
1200                         if (err)
1201                                 pr_warning("%s: power class selection to "
1202                                            "bus width %d ddr %d failed\n",
1203                                            mmc_hostname(card->host),
1204                                            1 << bus_width, ddr);
1205
1206                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1207                                          EXT_CSD_BUS_WIDTH,
1208                                          ext_csd_bits[idx][1],
1209                                          card->ext_csd.generic_cmd6_time);
1210                 }
1211                 if (err) {
1212                         pr_warning("%s: switch to bus width %d ddr %d "
1213                                 "failed\n", mmc_hostname(card->host),
1214                                 1 << bus_width, ddr);
1215                         goto free_card;
1216                 } else if (ddr) {
1217                         /*
1218                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1219                          * signaling.
1220                          *
1221                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1222                          *
1223                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1224                          * in the JEDEC spec for DDR.
1225                          *
1226                          * Do not force change in vccq since we are obviously
1227                          * working and no change to vccq is needed.
1228                          *
1229                          * WARNING: eMMC rules are NOT the same as SD DDR
1230                          */
1231                         if (ddr == MMC_1_2V_DDR_MODE) {
1232                                 err = __mmc_set_signal_voltage(host,
1233                                         MMC_SIGNAL_VOLTAGE_120);
1234                                 if (err)
1235                                         goto err;
1236                         }
1237                         mmc_card_set_ddr_mode(card);
1238                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1239                         mmc_set_bus_width(card->host, bus_width);
1240                 }
1241         }
1242
1243         /*
1244          * Enable HPI feature (if supported)
1245          */
1246         if (card->ext_csd.hpi) {
1247                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1248                                 EXT_CSD_HPI_MGMT, 1,
1249                                 card->ext_csd.generic_cmd6_time);
1250                 if (err && err != -EBADMSG)
1251                         goto free_card;
1252                 if (err) {
1253                         pr_warning("%s: Enabling HPI failed\n",
1254                                    mmc_hostname(card->host));
1255                         err = 0;
1256                 } else
1257                         card->ext_csd.hpi_en = 1;
1258         }
1259
1260         /*
1261          * If cache size is higher than 0, this indicates
1262          * the existence of cache and it can be turned on.
1263          */
1264         if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1265                         card->ext_csd.cache_size > 0) {
1266                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1267                                 EXT_CSD_CACHE_CTRL, 1,
1268                                 card->ext_csd.generic_cmd6_time);
1269                 if (err && err != -EBADMSG)
1270                         goto free_card;
1271
1272                 /*
1273                  * Only if no error, cache is turned on successfully.
1274                  */
1275                 if (err) {
1276                         pr_warning("%s: Cache is supported, "
1277                                         "but failed to turn on (%d)\n",
1278                                         mmc_hostname(card->host), err);
1279                         card->ext_csd.cache_ctrl = 0;
1280                         err = 0;
1281                 } else {
1282                         card->ext_csd.cache_ctrl = 1;
1283                 }
1284         }
1285
1286         /*
1287          * The mandatory minimum values are defined for packed command.
1288          * read: 5, write: 3
1289          */
1290         if (card->ext_csd.max_packed_writes >= 3 &&
1291             card->ext_csd.max_packed_reads >= 5 &&
1292             host->caps2 & MMC_CAP2_PACKED_CMD) {
1293                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1294                                 EXT_CSD_EXP_EVENTS_CTRL,
1295                                 EXT_CSD_PACKED_EVENT_EN,
1296                                 card->ext_csd.generic_cmd6_time);
1297                 if (err && err != -EBADMSG)
1298                         goto free_card;
1299                 if (err) {
1300                         pr_warn("%s: Enabling packed event failed\n",
1301                                 mmc_hostname(card->host));
1302                         card->ext_csd.packed_event_en = 0;
1303                         err = 0;
1304                 } else {
1305                         card->ext_csd.packed_event_en = 1;
1306                 }
1307         }
1308
1309         if (!oldcard)
1310                 host->card = card;
1311
1312         mmc_free_ext_csd(ext_csd);
1313         return 0;
1314
1315 free_card:
1316         if (!oldcard)
1317                 mmc_remove_card(card);
1318 err:
1319         mmc_free_ext_csd(ext_csd);
1320
1321         return err;
1322 }
1323
1324 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1325 {
1326         return card &&
1327                 mmc_card_mmc(card) &&
1328                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1329 }
1330
1331 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1332 {
1333         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1334         int err;
1335
1336         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1337         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1338                 timeout = card->ext_csd.power_off_longtime;
1339
1340         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1341                          EXT_CSD_POWER_OFF_NOTIFICATION,
1342                          notify_type, timeout);
1343         if (err)
1344                 pr_err("%s: Power Off Notification timed out, %u\n",
1345                        mmc_hostname(card->host), timeout);
1346
1347         /* Disable the power off notification after the switch operation. */
1348         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1349
1350         return err;
1351 }
1352
1353 /*
1354  * Host is being removed. Free up the current card.
1355  */
1356 static void mmc_remove(struct mmc_host *host)
1357 {
1358         BUG_ON(!host);
1359         BUG_ON(!host->card);
1360
1361         mmc_remove_card(host->card);
1362         host->card = NULL;
1363 }
1364
1365 /*
1366  * Card detection - card is alive.
1367  */
1368 static int mmc_alive(struct mmc_host *host)
1369 {
1370         return mmc_send_status(host->card, NULL);
1371 }
1372
1373 /*
1374  * Card detection callback from host.
1375  */
1376 static void mmc_detect(struct mmc_host *host)
1377 {
1378         int err;
1379
1380         BUG_ON(!host);
1381         BUG_ON(!host->card);
1382
1383         mmc_claim_host(host);
1384
1385         /*
1386          * Just check if our card has been removed.
1387          */
1388         err = _mmc_detect_card_removed(host);
1389
1390         mmc_release_host(host);
1391
1392         if (err) {
1393                 mmc_remove(host);
1394
1395                 mmc_claim_host(host);
1396                 mmc_detach_bus(host);
1397                 mmc_power_off(host);
1398                 mmc_release_host(host);
1399         }
1400 }
1401
1402 /*
1403  * Suspend callback from host.
1404  */
1405 static int mmc_suspend(struct mmc_host *host)
1406 {
1407         int err = 0;
1408
1409         BUG_ON(!host);
1410         BUG_ON(!host->card);
1411
1412         mmc_claim_host(host);
1413
1414         err = mmc_cache_ctrl(host, 0);
1415         if (err)
1416                 goto out;
1417
1418         if (mmc_can_poweroff_notify(host->card))
1419                 err = mmc_poweroff_notify(host->card, EXT_CSD_POWER_OFF_SHORT);
1420         else if (mmc_card_can_sleep(host))
1421                 err = mmc_card_sleep(host);
1422         else if (!mmc_host_is_spi(host))
1423                 err = mmc_deselect_cards(host);
1424         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1425
1426 out:
1427         mmc_release_host(host);
1428         return err;
1429 }
1430
1431 /*
1432  * Resume callback from host.
1433  *
1434  * This function tries to determine if the same card is still present
1435  * and, if so, restore all state to it.
1436  */
1437 static int mmc_resume(struct mmc_host *host)
1438 {
1439         int err;
1440
1441         BUG_ON(!host);
1442         BUG_ON(!host->card);
1443
1444         mmc_claim_host(host);
1445         err = mmc_init_card(host, host->ocr, host->card);
1446         mmc_release_host(host);
1447
1448         return err;
1449 }
1450
1451 static int mmc_power_restore(struct mmc_host *host)
1452 {
1453         int ret;
1454
1455         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1456         mmc_claim_host(host);
1457         ret = mmc_init_card(host, host->ocr, host->card);
1458         mmc_release_host(host);
1459
1460         return ret;
1461 }
1462
1463 static int mmc_sleep(struct mmc_host *host)
1464 {
1465         struct mmc_card *card = host->card;
1466         int err = -ENOSYS;
1467
1468         if (card && card->ext_csd.rev >= 3) {
1469                 err = mmc_card_sleepawake(host, 1);
1470                 if (err < 0)
1471                         pr_debug("%s: Error %d while putting card into sleep",
1472                                  mmc_hostname(host), err);
1473         }
1474
1475         return err;
1476 }
1477
1478 static int mmc_awake(struct mmc_host *host)
1479 {
1480         struct mmc_card *card = host->card;
1481         int err = -ENOSYS;
1482
1483         if (card && card->ext_csd.rev >= 3) {
1484                 err = mmc_card_sleepawake(host, 0);
1485                 if (err < 0)
1486                         pr_debug("%s: Error %d while awaking sleeping card",
1487                                  mmc_hostname(host), err);
1488         }
1489
1490         return err;
1491 }
1492
1493 static const struct mmc_bus_ops mmc_ops = {
1494         .awake = mmc_awake,
1495         .sleep = mmc_sleep,
1496         .remove = mmc_remove,
1497         .detect = mmc_detect,
1498         .suspend = NULL,
1499         .resume = NULL,
1500         .power_restore = mmc_power_restore,
1501         .alive = mmc_alive,
1502 };
1503
1504 static const struct mmc_bus_ops mmc_ops_unsafe = {
1505         .awake = mmc_awake,
1506         .sleep = mmc_sleep,
1507         .remove = mmc_remove,
1508         .detect = mmc_detect,
1509         .suspend = mmc_suspend,
1510         .resume = mmc_resume,
1511         .power_restore = mmc_power_restore,
1512         .alive = mmc_alive,
1513 };
1514
1515 static void mmc_attach_bus_ops(struct mmc_host *host)
1516 {
1517         const struct mmc_bus_ops *bus_ops;
1518
1519         if (!mmc_card_is_removable(host))
1520                 bus_ops = &mmc_ops_unsafe;
1521         else
1522                 bus_ops = &mmc_ops;
1523         mmc_attach_bus(host, bus_ops);
1524 }
1525
1526 /*
1527  * Starting point for MMC card init.
1528  */
1529 int mmc_attach_mmc(struct mmc_host *host)
1530 {
1531         int err;
1532         u32 ocr;
1533
1534         BUG_ON(!host);
1535         WARN_ON(!host->claimed);
1536
1537         /* Set correct bus mode for MMC before attempting attach */
1538         if (!mmc_host_is_spi(host))
1539                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1540
1541         err = mmc_send_op_cond(host, 0, &ocr);
1542         if (err)
1543                 return err;
1544
1545         mmc_attach_bus_ops(host);
1546         if (host->ocr_avail_mmc)
1547                 host->ocr_avail = host->ocr_avail_mmc;
1548
1549         /*
1550          * We need to get OCR a different way for SPI.
1551          */
1552         if (mmc_host_is_spi(host)) {
1553                 err = mmc_spi_read_ocr(host, 1, &ocr);
1554                 if (err)
1555                         goto err;
1556         }
1557
1558         /*
1559          * Sanity check the voltages that the card claims to
1560          * support.
1561          */
1562         if (ocr & 0x7F) {
1563                 pr_warning("%s: card claims to support voltages "
1564                        "below the defined range. These will be ignored.\n",
1565                        mmc_hostname(host));
1566                 ocr &= ~0x7F;
1567         }
1568
1569         host->ocr = mmc_select_voltage(host, ocr);
1570
1571         /*
1572          * Can we support the voltage of the card?
1573          */
1574         if (!host->ocr) {
1575                 err = -EINVAL;
1576                 goto err;
1577         }
1578
1579         /*
1580          * Detect and init the card.
1581          */
1582         err = mmc_init_card(host, host->ocr, NULL);
1583         if (err)
1584                 goto err;
1585
1586         mmc_release_host(host);
1587         err = mmc_add_card(host->card);
1588         mmc_claim_host(host);
1589         if (err)
1590                 goto remove_card;
1591
1592         return 0;
1593
1594 remove_card:
1595         mmc_release_host(host);
1596         mmc_remove_card(host->card);
1597         mmc_claim_host(host);
1598         host->card = NULL;
1599 err:
1600         mmc_detach_bus(host);
1601
1602         pr_err("%s: error %d whilst initialising MMC card\n",
1603                 mmc_hostname(host), err);
1604
1605         return err;
1606 }