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 static void mmc_select_card_type(struct mmc_card *card)
 239 {
 240         struct mmc_host *host = card->host;
 241         u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK;
 242         unsigned int caps = host->caps, caps2 = host->caps2;
 243         unsigned int hs_max_dtr = 0;
 244
 245         if (card_type & EXT_CSD_CARD_TYPE_26)
 246                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
 247
 248         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 249                         card_type & EXT_CSD_CARD_TYPE_52)
 250                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
 251
 252         if ((caps & MMC_CAP_1_8V_DDR &&
 253                         card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) ||
 254             (caps & MMC_CAP_1_2V_DDR &&
 255                         card_type & EXT_CSD_CARD_TYPE_DDR_1_2V))
 256                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 257
 258         if ((caps2 & MMC_CAP2_HS200_1_8V_SDR &&
 259                         card_type & EXT_CSD_CARD_TYPE_SDR_1_8V) ||
 260             (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
 261                         card_type & EXT_CSD_CARD_TYPE_SDR_1_2V))
 262                 hs_max_dtr = MMC_HS200_MAX_DTR;
 263
 264         card->ext_csd.hs_max_dtr = hs_max_dtr;
 265         card->ext_csd.card_type = card_type;
 266 }
 267
 268 /*
 269  * Decode extended CSD.
 270  */
 271 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 272 {
 273         int err = 0, idx;
 274         unsigned int part_size;
 275         u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
 276
 277         BUG_ON(!card);
 278
 279         if (!ext_csd)
 280                 return 0;
 281
 282         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 283         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 284         if (card->csd.structure == 3) {
 285                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 286                         pr_err("%s: unrecognised EXT_CSD structure "
 287                                 "version %d\n", mmc_hostname(card->host),
 288                                         card->ext_csd.raw_ext_csd_structure);
 289                         err = -EINVAL;
 290                         goto out;
 291                 }
 292         }
 293
 294         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 295         if (card->ext_csd.rev > 6) {
 296                 pr_err("%s: unrecognised EXT_CSD revision %d\n",
 297                         mmc_hostname(card->host), card->ext_csd.rev);
 298                 err = -EINVAL;
 299                 goto out;
 300         }
 301
 302         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 303         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 304         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 305         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 306         if (card->ext_csd.rev >= 2) {
 307                 card->ext_csd.sectors =
 308                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 309                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 310                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 311                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 312
 313                 /* Cards with density > 2GiB are sector addressed */
 314                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 315                         mmc_card_set_blockaddr(card);
 316         }
 317
 318         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 319         mmc_select_card_type(card);
 320
 321         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 322         card->ext_csd.raw_erase_timeout_mult =
 323                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 324         card->ext_csd.raw_hc_erase_grp_size =
 325                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 326         if (card->ext_csd.rev >= 3) {
 327                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 328                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 329
 330                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 331                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 332
 333                 /* Sleep / awake timeout in 100ns units */
 334                 if (sa_shift > 0 && sa_shift <= 0x17)
 335                         card->ext_csd.sa_timeout =
 336                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 337                 card->ext_csd.erase_group_def =
 338                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 339                 card->ext_csd.hc_erase_timeout = 300 *
 340                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 341                 card->ext_csd.hc_erase_size =
 342                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 343
 344                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 345
 346                 /*
 347                  * There are two boot regions of equal size, defined in
 348                  * multiples of 128K.
 349                  */
 350                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 351                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 352                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 353                                 mmc_part_add(card, part_size,
 354                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 355                                         "boot%d", idx, true,
 356                                         MMC_BLK_DATA_AREA_BOOT);
 357                         }
 358                 }
 359         }
 360
 361         card->ext_csd.raw_hc_erase_gap_size =
 362                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 363         card->ext_csd.raw_sec_trim_mult =
 364                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 365         card->ext_csd.raw_sec_erase_mult =
 366                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 367         card->ext_csd.raw_sec_feature_support =
 368                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 369         card->ext_csd.raw_trim_mult =
 370                 ext_csd[EXT_CSD_TRIM_MULT];
 371         if (card->ext_csd.rev >= 4) {
 372                 /*
 373                  * Enhanced area feature support -- check whether the eMMC
 374                  * card has the Enhanced area enabled.  If so, export enhanced
 375                  * area offset and size to user by adding sysfs interface.
 376                  */
 377                 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 378                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 379                     (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 380                         hc_erase_grp_sz =
 381                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 382                         hc_wp_grp_sz =
 383                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 384
 385                         card->ext_csd.enhanced_area_en = 1;
 386                         /*
 387                          * calculate the enhanced data area offset, in bytes
 388                          */
 389                         card->ext_csd.enhanced_area_offset =
 390                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
 391                                 (ext_csd[137] << 8) + ext_csd[136];
 392                         if (mmc_card_blockaddr(card))
 393                                 card->ext_csd.enhanced_area_offset <<= 9;
 394                         /*
 395                          * calculate the enhanced data area size, in kilobytes
 396                          */
 397                         card->ext_csd.enhanced_area_size =
 398                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 399                                 ext_csd[140];
 400                         card->ext_csd.enhanced_area_size *=
 401                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 402                         card->ext_csd.enhanced_area_size <<= 9;
 403                 } else {
 404                         /*
 405                          * If the enhanced area is not enabled, disable these
 406                          * device attributes.
 407                          */
 408                         card->ext_csd.enhanced_area_offset = -EINVAL;
 409                         card->ext_csd.enhanced_area_size = -EINVAL;
 410                 }
 411
 412                 /*
 413                  * General purpose partition feature support --
 414                  * If ext_csd has the size of general purpose partitions,
 415                  * set size, part_cfg, partition name in mmc_part.
 416                  */
 417                 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 418                         EXT_CSD_PART_SUPPORT_PART_EN) {
 419                         if (card->ext_csd.enhanced_area_en != 1) {
 420                                 hc_erase_grp_sz =
 421                                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 422                                 hc_wp_grp_sz =
 423                                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 424
 425                                 card->ext_csd.enhanced_area_en = 1;
 426                         }
 427
 428                         for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 429                                 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 430                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 431                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 432                                         continue;
 433                                 part_size =
 434                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 435                                         << 16) +
 436                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 437                                         << 8) +
 438                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 439                                 part_size *= (size_t)(hc_erase_grp_sz *
 440                                         hc_wp_grp_sz);
 441                                 mmc_part_add(card, part_size << 19,
 442                                         EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 443                                         "gp%d", idx, false,
 444                                         MMC_BLK_DATA_AREA_GP);
 445                         }
 446                 }
 447                 card->ext_csd.sec_trim_mult =
 448                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 449                 card->ext_csd.sec_erase_mult =
 450                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 451                 card->ext_csd.sec_feature_support =
 452                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 453                 card->ext_csd.trim_timeout = 300 *
 454                         ext_csd[EXT_CSD_TRIM_MULT];
 455
 456                 /*
 457                  * Note that the call to mmc_part_add above defaults to read
 458                  * only. If this default assumption is changed, the call must
 459                  * take into account the value of boot_locked below.
 460                  */
 461                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 462                 card->ext_csd.boot_ro_lockable = true;
 463         }
 464
 465         if (card->ext_csd.rev >= 5) {
 466                 /* check whether the eMMC card supports HPI */
 467                 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
 468                         card->ext_csd.hpi = 1;
 469                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 470                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 471                         else
 472                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 473                         /*
 474                          * Indicate the maximum timeout to close
 475                          * a command interrupted by HPI
 476                          */
 477                         card->ext_csd.out_of_int_time =
 478                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 479                 }
 480
 481                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 482                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 483         }
 484
 485         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 486         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 487                 card->erased_byte = 0xFF;
 488         else
 489                 card->erased_byte = 0x0;
 490
 491         /* eMMC v4.5 or later */
 492         if (card->ext_csd.rev >= 6) {
 493                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 494
 495                 card->ext_csd.generic_cmd6_time = 10 *
 496                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 497                 card->ext_csd.power_off_longtime = 10 *
 498                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 499
 500                 card->ext_csd.cache_size =
 501                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 502                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 503                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 504                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 505
 506                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 507                         card->ext_csd.data_sector_size = 4096;
 508                 else
 509                         card->ext_csd.data_sector_size = 512;
 510
 511                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 512                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 513                         card->ext_csd.data_tag_unit_size =
 514                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 515                         (card->ext_csd.data_sector_size);
 516                 } else {
 517                         card->ext_csd.data_tag_unit_size = 0;
 518                 }
 519         } else {
 520                 card->ext_csd.data_sector_size = 512;
 521         }
 522
 523 out:
 524         return err;
 525 }
 526
 527 static inline void mmc_free_ext_csd(u8 *ext_csd)
 528 {
 529         kfree(ext_csd);
 530 }
 531
 532
 533 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 534 {
 535         u8 *bw_ext_csd;
 536         int err;
 537
 538         if (bus_width == MMC_BUS_WIDTH_1)
 539                 return 0;
 540
 541         err = mmc_get_ext_csd(card, &bw_ext_csd);
 542
 543         if (err || bw_ext_csd == NULL) {
 544                 err = -EINVAL;
 545                 goto out;
 546         }
 547
 548         /* only compare read only fields */
 549         err = !((card->ext_csd.raw_partition_support ==
 550                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 551                 (card->ext_csd.raw_erased_mem_count ==
 552                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 553                 (card->ext_csd.rev ==
 554                         bw_ext_csd[EXT_CSD_REV]) &&
 555                 (card->ext_csd.raw_ext_csd_structure ==
 556                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 557                 (card->ext_csd.raw_card_type ==
 558                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 559                 (card->ext_csd.raw_s_a_timeout ==
 560                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 561                 (card->ext_csd.raw_hc_erase_gap_size ==
 562                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 563                 (card->ext_csd.raw_erase_timeout_mult ==
 564                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 565                 (card->ext_csd.raw_hc_erase_grp_size ==
 566                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 567                 (card->ext_csd.raw_sec_trim_mult ==
 568                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 569                 (card->ext_csd.raw_sec_erase_mult ==
 570                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 571                 (card->ext_csd.raw_sec_feature_support ==
 572                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 573                 (card->ext_csd.raw_trim_mult ==
 574                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 575                 (card->ext_csd.raw_sectors[0] ==
 576                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 577                 (card->ext_csd.raw_sectors[1] ==
 578                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 579                 (card->ext_csd.raw_sectors[2] ==
 580                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 581                 (card->ext_csd.raw_sectors[3] ==
 582                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
 583         if (err)
 584                 err = -EINVAL;
 585
 586 out:
 587         mmc_free_ext_csd(bw_ext_csd);
 588         return err;
 589 }
 590
 591 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 592         card->raw_cid[2], card->raw_cid[3]);
 593 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 594         card->raw_csd[2], card->raw_csd[3]);
 595 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 596 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 597 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 598 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 599 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 600 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 601 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 602 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 603 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 604 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 605                 card->ext_csd.enhanced_area_offset);
 606 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 607
 608 static struct attribute *mmc_std_attrs[] = {
 609         &dev_attr_cid.attr,
 610         &dev_attr_csd.attr,
 611         &dev_attr_date.attr,
 612         &dev_attr_erase_size.attr,
 613         &dev_attr_preferred_erase_size.attr,
 614         &dev_attr_fwrev.attr,
 615         &dev_attr_hwrev.attr,
 616         &dev_attr_manfid.attr,
 617         &dev_attr_name.attr,
 618         &dev_attr_oemid.attr,
 619         &dev_attr_serial.attr,
 620         &dev_attr_enhanced_area_offset.attr,
 621         &dev_attr_enhanced_area_size.attr,
 622         NULL,
 623 };
 624
 625 static struct attribute_group mmc_std_attr_group = {
 626         .attrs = mmc_std_attrs,
 627 };
 628
 629 static const struct attribute_group *mmc_attr_groups[] = {
 630         &mmc_std_attr_group,
 631         NULL,
 632 };
 633
 634 static struct device_type mmc_type = {
 635         .groups = mmc_attr_groups,
 636 };
 637
 638 /*
 639  * Select the PowerClass for the current bus width
 640  * If power class is defined for 4/8 bit bus in the
 641  * extended CSD register, select it by executing the
 642  * mmc_switch command.
 643  */
 644 static int mmc_select_powerclass(struct mmc_card *card,
 645                 unsigned int bus_width, u8 *ext_csd)
 646 {
 647         int err = 0;
 648         unsigned int pwrclass_val;
 649         unsigned int index = 0;
 650         struct mmc_host *host;
 651
 652         BUG_ON(!card);
 653
 654         host = card->host;
 655         BUG_ON(!host);
 656
 657         if (ext_csd == NULL)
 658                 return 0;
 659
 660         /* Power class selection is supported for versions >= 4.0 */
 661         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 662                 return 0;
 663
 664         /* Power class values are defined only for 4/8 bit bus */
 665         if (bus_width == EXT_CSD_BUS_WIDTH_1)
 666                 return 0;
 667
 668         switch (1 << host->ios.vdd) {
 669         case MMC_VDD_165_195:
 670                 if (host->ios.clock <= 26000000)
 671                         index = EXT_CSD_PWR_CL_26_195;
 672                 else if (host->ios.clock <= 52000000)
 673                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 674                                 EXT_CSD_PWR_CL_52_195 :
 675                                 EXT_CSD_PWR_CL_DDR_52_195;
 676                 else if (host->ios.clock <= 200000000)
 677                         index = EXT_CSD_PWR_CL_200_195;
 678                 break;
 679         case MMC_VDD_27_28:
 680         case MMC_VDD_28_29:
 681         case MMC_VDD_29_30:
 682         case MMC_VDD_30_31:
 683         case MMC_VDD_31_32:
 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         if (err)
 721                 pr_err("%s: power class selection for ext_csd_bus_width %d"
 722                        " failed\n", mmc_hostname(card->host), bus_width);
 723
 724         return err;
 725 }
 726
 727 /*
 728  * Selects the desired buswidth and switch to the HS200 mode
 729  * if bus width set without error
 730  */
 731 static int mmc_select_hs200(struct mmc_card *card)
 732 {
 733         int idx, err = -EINVAL;
 734         struct mmc_host *host;
 735         static unsigned ext_csd_bits[] = {
 736                 EXT_CSD_BUS_WIDTH_4,
 737                 EXT_CSD_BUS_WIDTH_8,
 738         };
 739         static unsigned bus_widths[] = {
 740                 MMC_BUS_WIDTH_4,
 741                 MMC_BUS_WIDTH_8,
 742         };
 743
 744         BUG_ON(!card);
 745
 746         host = card->host;
 747
 748         if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
 749                         host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
 750                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0);
 751
 752         if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V &&
 753                         host->caps2 & MMC_CAP2_HS200_1_8V_SDR)
 754                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 0);
 755
 756         /* If fails try again during next card power cycle */
 757         if (err)
 758                 goto err;
 759
 760         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0;
 761
 762         /*
 763          * Unlike SD, MMC cards dont have a configuration register to notify
 764          * supported bus width. So bus test command should be run to identify
 765          * the supported bus width or compare the ext csd values of current
 766          * bus width and ext csd values of 1 bit mode read earlier.
 767          */
 768         for (; idx >= 0; idx--) {
 769
 770                 /*
 771                  * Host is capable of 8bit transfer, then switch
 772                  * the device to work in 8bit transfer mode. If the
 773                  * mmc switch command returns error then switch to
 774                  * 4bit transfer mode. On success set the corresponding
 775                  * bus width on the host.
 776                  */
 777                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 778                                  EXT_CSD_BUS_WIDTH,
 779                                  ext_csd_bits[idx],
 780                                  card->ext_csd.generic_cmd6_time);
 781                 if (err)
 782                         continue;
 783
 784                 mmc_set_bus_width(card->host, bus_widths[idx]);
 785
 786                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 787                         err = mmc_compare_ext_csds(card, bus_widths[idx]);
 788                 else
 789                         err = mmc_bus_test(card, bus_widths[idx]);
 790                 if (!err)
 791                         break;
 792         }
 793
 794         /* switch to HS200 mode if bus width set successfully */
 795         if (!err)
 796                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 797                                  EXT_CSD_HS_TIMING, 2, 0);
 798 err:
 799         return err;
 800 }
 801
 802 /*
 803  * Handle the detection and initialisation of a card.
 804  *
 805  * In the case of a resume, "oldcard" will contain the card
 806  * we're trying to reinitialise.
 807  */
 808 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 809         struct mmc_card *oldcard)
 810 {
 811         struct mmc_card *card;
 812         int err, ddr = 0;
 813         u32 cid[4];
 814         unsigned int max_dtr;
 815         u32 rocr;
 816         u8 *ext_csd = NULL;
 817
 818         BUG_ON(!host);
 819         WARN_ON(!host->claimed);
 820
 821         /* Set correct bus mode for MMC before attempting init */
 822         if (!mmc_host_is_spi(host))
 823                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 824
 825         /* Initialization should be done at 3.3 V I/O voltage. */
 826         mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
 827
 828         /*
 829          * Since we're changing the OCR value, we seem to
 830          * need to tell some cards to go back to the idle
 831          * state.  We wait 1ms to give cards time to
 832          * respond.
 833          * mmc_go_idle is needed for eMMC that are asleep
 834          */
 835         mmc_go_idle(host);
 836
 837         /* The extra bit indicates that we support high capacity */
 838         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 839         if (err)
 840                 goto err;
 841
 842         /*
 843          * For SPI, enable CRC as appropriate.
 844          */
 845         if (mmc_host_is_spi(host)) {
 846                 err = mmc_spi_set_crc(host, use_spi_crc);
 847                 if (err)
 848                         goto err;
 849         }
 850
 851         /*
 852          * Fetch CID from card.
 853          */
 854         if (mmc_host_is_spi(host))
 855                 err = mmc_send_cid(host, cid);
 856         else
 857                 err = mmc_all_send_cid(host, cid);
 858         if (err)
 859                 goto err;
 860
 861         if (oldcard) {
 862                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 863                         err = -ENOENT;
 864                         goto err;
 865                 }
 866
 867                 card = oldcard;
 868         } else {
 869                 /*
 870                  * Allocate card structure.
 871                  */
 872                 card = mmc_alloc_card(host, &mmc_type);
 873                 if (IS_ERR(card)) {
 874                         err = PTR_ERR(card);
 875                         goto err;
 876                 }
 877
 878                 card->type = MMC_TYPE_MMC;
 879                 card->rca = 1;
 880                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 881         }
 882
 883         /*
 884          * For native busses:  set card RCA and quit open drain mode.
 885          */
 886         if (!mmc_host_is_spi(host)) {
 887                 err = mmc_set_relative_addr(card);
 888                 if (err)
 889                         goto free_card;
 890
 891                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 892         }
 893
 894         if (!oldcard) {
 895                 /*
 896                  * Fetch CSD from card.
 897                  */
 898                 err = mmc_send_csd(card, card->raw_csd);
 899                 if (err)
 900                         goto free_card;
 901
 902                 err = mmc_decode_csd(card);
 903                 if (err)
 904                         goto free_card;
 905                 err = mmc_decode_cid(card);
 906                 if (err)
 907                         goto free_card;
 908         }
 909
 910         /*
 911          * Select card, as all following commands rely on that.
 912          */
 913         if (!mmc_host_is_spi(host)) {
 914                 err = mmc_select_card(card);
 915                 if (err)
 916                         goto free_card;
 917         }
 918
 919         if (!oldcard) {
 920                 /*
 921                  * Fetch and process extended CSD.
 922                  */
 923
 924                 err = mmc_get_ext_csd(card, &ext_csd);
 925                 if (err)
 926                         goto free_card;
 927                 err = mmc_read_ext_csd(card, ext_csd);
 928                 if (err)
 929                         goto free_card;
 930
 931                 /* If doing byte addressing, check if required to do sector
 932                  * addressing.  Handle the case of <2GB cards needing sector
 933                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 934                  * ocr register has bit 30 set for sector addressing.
 935                  */
 936                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 937                         mmc_card_set_blockaddr(card);
 938
 939                 /* Erase size depends on CSD and Extended CSD */
 940                 mmc_set_erase_size(card);
 941         }
 942
 943         /*
 944          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 945          * bit.  This bit will be lost every time after a reset or power off.
 946          */
 947         if (card->ext_csd.enhanced_area_en ||
 948             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
 949                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 950                                  EXT_CSD_ERASE_GROUP_DEF, 1,
 951                                  card->ext_csd.generic_cmd6_time);
 952
 953                 if (err && err != -EBADMSG)
 954                         goto free_card;
 955
 956                 if (err) {
 957                         err = 0;
 958                         /*
 959                          * Just disable enhanced area off & sz
 960                          * will try to enable ERASE_GROUP_DEF
 961                          * during next time reinit
 962                          */
 963                         card->ext_csd.enhanced_area_offset = -EINVAL;
 964                         card->ext_csd.enhanced_area_size = -EINVAL;
 965                 } else {
 966                         card->ext_csd.erase_group_def = 1;
 967                         /*
 968                          * enable ERASE_GRP_DEF successfully.
 969                          * This will affect the erase size, so
 970                          * here need to reset erase size
 971                          */
 972                         mmc_set_erase_size(card);
 973                 }
 974         }
 975
 976         /*
 977          * Ensure eMMC user default partition is enabled
 978          */
 979         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
 980                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 981                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
 982                                  card->ext_csd.part_config,
 983                                  card->ext_csd.part_time);
 984                 if (err && err != -EBADMSG)
 985                         goto free_card;
 986         }
 987
 988         /*
 989          * If the host supports the power_off_notify capability then
 990          * set the notification byte in the ext_csd register of device
 991          */
 992         if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
 993             (card->ext_csd.rev >= 6)) {
 994                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 995                                  EXT_CSD_POWER_OFF_NOTIFICATION,
 996                                  EXT_CSD_POWER_ON,
 997                                  card->ext_csd.generic_cmd6_time);
 998                 if (err && err != -EBADMSG)
 999                         goto free_card;
1000
1001                 /*
1002                  * The err can be -EBADMSG or 0,
1003                  * so check for success and update the flag
1004                  */
1005                 if (!err)
1006                         card->poweroff_notify_state = MMC_POWERED_ON;
1007         }
1008
1009         /*
1010          * Activate high speed (if supported)
1011          */
1012         if (card->ext_csd.hs_max_dtr != 0) {
1013                 err = 0;
1014                 if (card->ext_csd.hs_max_dtr > 52000000 &&
1015                     host->caps2 & MMC_CAP2_HS200)
1016                         err = mmc_select_hs200(card);
1017                 else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
1018                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1019                                          EXT_CSD_HS_TIMING, 1,
1020                                          card->ext_csd.generic_cmd6_time);
1021
1022                 if (err && err != -EBADMSG)
1023                         goto free_card;
1024
1025                 if (err) {
1026                         pr_warning("%s: switch to highspeed failed\n",
1027                                mmc_hostname(card->host));
1028                         err = 0;
1029                 } else {
1030                         if (card->ext_csd.hs_max_dtr > 52000000 &&
1031                             host->caps2 & MMC_CAP2_HS200) {
1032                                 mmc_card_set_hs200(card);
1033                                 mmc_set_timing(card->host,
1034                                                MMC_TIMING_MMC_HS200);
1035                         } else {
1036                                 mmc_card_set_highspeed(card);
1037                                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1038                         }
1039                 }
1040         }
1041
1042         /*
1043          * Compute bus speed.
1044          */
1045         max_dtr = (unsigned int)-1;
1046
1047         if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
1048                 if (max_dtr > card->ext_csd.hs_max_dtr)
1049                         max_dtr = card->ext_csd.hs_max_dtr;
1050         } else if (max_dtr > card->csd.max_dtr) {
1051                 max_dtr = card->csd.max_dtr;
1052         }
1053
1054         mmc_set_clock(host, max_dtr);
1055
1056         /*
1057          * Indicate DDR mode (if supported).
1058          */
1059         if (mmc_card_highspeed(card)) {
1060                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
1061                         && ((host->caps & (MMC_CAP_1_8V_DDR |
1062                              MMC_CAP_UHS_DDR50))
1063                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
1064                                 ddr = MMC_1_8V_DDR_MODE;
1065                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1066                         && ((host->caps & (MMC_CAP_1_2V_DDR |
1067                              MMC_CAP_UHS_DDR50))
1068                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
1069                                 ddr = MMC_1_2V_DDR_MODE;
1070         }
1071
1072         /*
1073          * Indicate HS200 SDR mode (if supported).
1074          */
1075         if (mmc_card_hs200(card)) {
1076                 u32 ext_csd_bits;
1077                 u32 bus_width = card->host->ios.bus_width;
1078
1079                 /*
1080                  * For devices supporting HS200 mode, the bus width has
1081                  * to be set before executing the tuning function. If
1082                  * set before tuning, then device will respond with CRC
1083                  * errors for responses on CMD line. So for HS200 the
1084                  * sequence will be
1085                  * 1. set bus width 4bit / 8 bit (1 bit not supported)
1086                  * 2. switch to HS200 mode
1087                  * 3. set the clock to > 52Mhz <=200MHz and
1088                  * 4. execute tuning for HS200
1089                  */
1090                 if ((host->caps2 & MMC_CAP2_HS200) &&
1091                     card->host->ops->execute_tuning) {
1092                         mmc_host_clk_hold(card->host);
1093                         err = card->host->ops->execute_tuning(card->host,
1094                                 MMC_SEND_TUNING_BLOCK_HS200);
1095                         mmc_host_clk_release(card->host);
1096                 }
1097                 if (err) {
1098                         pr_warning("%s: tuning execution failed\n",
1099                                    mmc_hostname(card->host));
1100                         goto err;
1101                 }
1102
1103                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1104                                 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
1105                 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
1106                 if (err)
1107                         goto err;
1108         }
1109
1110         /*
1111          * Activate wide bus and DDR (if supported).
1112          */
1113         if (!mmc_card_hs200(card) &&
1114             (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
1115             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
1116                 static unsigned ext_csd_bits[][2] = {
1117                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
1118                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
1119                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
1120                 };
1121                 static unsigned bus_widths[] = {
1122                         MMC_BUS_WIDTH_8,
1123                         MMC_BUS_WIDTH_4,
1124                         MMC_BUS_WIDTH_1
1125                 };
1126                 unsigned idx, bus_width = 0;
1127
1128                 if (host->caps & MMC_CAP_8_BIT_DATA)
1129                         idx = 0;
1130                 else
1131                         idx = 1;
1132                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1133                         bus_width = bus_widths[idx];
1134                         if (bus_width == MMC_BUS_WIDTH_1)
1135                                 ddr = 0; /* no DDR for 1-bit width */
1136                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
1137                                                     ext_csd);
1138                         if (err)
1139                                 goto err;
1140
1141                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1142                                          EXT_CSD_BUS_WIDTH,
1143                                          ext_csd_bits[idx][0],
1144                                          card->ext_csd.generic_cmd6_time);
1145                         if (!err) {
1146                                 mmc_set_bus_width(card->host, bus_width);
1147
1148                                 /*
1149                                  * If controller can't handle bus width test,
1150                                  * compare ext_csd previously read in 1 bit mode
1151                                  * against ext_csd at new bus width
1152                                  */
1153                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1154                                         err = mmc_compare_ext_csds(card,
1155                                                 bus_width);
1156                                 else
1157                                         err = mmc_bus_test(card, bus_width);
1158                                 if (!err)
1159                                         break;
1160                         }
1161                 }
1162
1163                 if (!err && ddr) {
1164                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1165                                                     ext_csd);
1166                         if (err)
1167                                 goto err;
1168
1169                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1170                                          EXT_CSD_BUS_WIDTH,
1171                                          ext_csd_bits[idx][1],
1172                                          card->ext_csd.generic_cmd6_time);
1173                 }
1174                 if (err) {
1175                         pr_warning("%s: switch to bus width %d ddr %d "
1176                                 "failed\n", mmc_hostname(card->host),
1177                                 1 << bus_width, ddr);
1178                         goto free_card;
1179                 } else if (ddr) {
1180                         /*
1181                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1182                          * signaling.
1183                          *
1184                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1185                          *
1186                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1187                          * in the JEDEC spec for DDR.
1188                          *
1189                          * Do not force change in vccq since we are obviously
1190                          * working and no change to vccq is needed.
1191                          *
1192                          * WARNING: eMMC rules are NOT the same as SD DDR
1193                          */
1194                         if (ddr == MMC_1_2V_DDR_MODE) {
1195                                 err = mmc_set_signal_voltage(host,
1196                                         MMC_SIGNAL_VOLTAGE_120, 0);
1197                                 if (err)
1198                                         goto err;
1199                         }
1200                         mmc_card_set_ddr_mode(card);
1201                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1202                         mmc_set_bus_width(card->host, bus_width);
1203                 }
1204         }
1205
1206         /*
1207          * Enable HPI feature (if supported)
1208          */
1209         if (card->ext_csd.hpi) {
1210                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1211                                 EXT_CSD_HPI_MGMT, 1,
1212                                 card->ext_csd.generic_cmd6_time);
1213                 if (err && err != -EBADMSG)
1214                         goto free_card;
1215                 if (err) {
1216                         pr_warning("%s: Enabling HPI failed\n",
1217                                    mmc_hostname(card->host));
1218                         err = 0;
1219                 } else
1220                         card->ext_csd.hpi_en = 1;
1221         }
1222
1223         /*
1224          * If cache size is higher than 0, this indicates
1225          * the existence of cache and it can be turned on.
1226          */
1227         if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1228                         card->ext_csd.cache_size > 0) {
1229                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1230                                 EXT_CSD_CACHE_CTRL, 1,
1231                                 card->ext_csd.generic_cmd6_time);
1232                 if (err && err != -EBADMSG)
1233                         goto free_card;
1234
1235                 /*
1236                  * Only if no error, cache is turned on successfully.
1237                  */
1238                 if (err) {
1239                         pr_warning("%s: Cache is supported, "
1240                                         "but failed to turn on (%d)\n",
1241                                         mmc_hostname(card->host), err);
1242                         card->ext_csd.cache_ctrl = 0;
1243                         err = 0;
1244                 } else {
1245                         card->ext_csd.cache_ctrl = 1;
1246                 }
1247         }
1248
1249         if (!oldcard)
1250                 host->card = card;
1251
1252         mmc_free_ext_csd(ext_csd);
1253         return 0;
1254
1255 free_card:
1256         if (!oldcard)
1257                 mmc_remove_card(card);
1258 err:
1259         mmc_free_ext_csd(ext_csd);
1260
1261         return err;
1262 }
1263
1264 /*
1265  * Host is being removed. Free up the current card.
1266  */
1267 static void mmc_remove(struct mmc_host *host)
1268 {
1269         BUG_ON(!host);
1270         BUG_ON(!host->card);
1271
1272         mmc_remove_card(host->card);
1273         host->card = NULL;
1274 }
1275
1276 /*
1277  * Card detection - card is alive.
1278  */
1279 static int mmc_alive(struct mmc_host *host)
1280 {
1281         return mmc_send_status(host->card, NULL);
1282 }
1283
1284 /*
1285  * Card detection callback from host.
1286  */
1287 static void mmc_detect(struct mmc_host *host)
1288 {
1289         int err;
1290
1291         BUG_ON(!host);
1292         BUG_ON(!host->card);
1293
1294         mmc_claim_host(host);
1295
1296         /*
1297          * Just check if our card has been removed.
1298          */
1299         err = _mmc_detect_card_removed(host);
1300
1301         mmc_release_host(host);
1302
1303         if (err) {
1304                 mmc_remove(host);
1305
1306                 mmc_claim_host(host);
1307                 mmc_detach_bus(host);
1308                 mmc_power_off(host);
1309                 mmc_release_host(host);
1310         }
1311 }
1312
1313 /*
1314  * Suspend callback from host.
1315  */
1316 static int mmc_suspend(struct mmc_host *host)
1317 {
1318         int err = 0;
1319
1320         BUG_ON(!host);
1321         BUG_ON(!host->card);
1322
1323         mmc_claim_host(host);
1324         if (mmc_card_can_sleep(host)) {
1325                 err = mmc_card_sleep(host);
1326                 if (!err)
1327                         mmc_card_set_sleep(host->card);
1328         } else if (!mmc_host_is_spi(host))
1329                 mmc_deselect_cards(host);
1330         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1331         mmc_release_host(host);
1332
1333         return err;
1334 }
1335
1336 /*
1337  * Resume callback from host.
1338  *
1339  * This function tries to determine if the same card is still present
1340  * and, if so, restore all state to it.
1341  */
1342 static int mmc_resume(struct mmc_host *host)
1343 {
1344         int err;
1345
1346         BUG_ON(!host);
1347         BUG_ON(!host->card);
1348
1349         mmc_claim_host(host);
1350         if (mmc_card_is_sleep(host->card)) {
1351                 err = mmc_card_awake(host);
1352                 mmc_card_clr_sleep(host->card);
1353         } else
1354                 err = mmc_init_card(host, host->ocr, host->card);
1355         mmc_release_host(host);
1356
1357         return err;
1358 }
1359
1360 static int mmc_power_restore(struct mmc_host *host)
1361 {
1362         int ret;
1363
1364         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1365         mmc_card_clr_sleep(host->card);
1366         mmc_claim_host(host);
1367         ret = mmc_init_card(host, host->ocr, host->card);
1368         mmc_release_host(host);
1369
1370         return ret;
1371 }
1372
1373 static int mmc_sleep(struct mmc_host *host)
1374 {
1375         struct mmc_card *card = host->card;
1376         int err = -ENOSYS;
1377
1378         if (card && card->ext_csd.rev >= 3) {
1379                 err = mmc_card_sleepawake(host, 1);
1380                 if (err < 0)
1381                         pr_debug("%s: Error %d while putting card into sleep",
1382                                  mmc_hostname(host), err);
1383         }
1384
1385         return err;
1386 }
1387
1388 static int mmc_awake(struct mmc_host *host)
1389 {
1390         struct mmc_card *card = host->card;
1391         int err = -ENOSYS;
1392
1393         if (card && card->ext_csd.rev >= 3) {
1394                 err = mmc_card_sleepawake(host, 0);
1395                 if (err < 0)
1396                         pr_debug("%s: Error %d while awaking sleeping card",
1397                                  mmc_hostname(host), err);
1398         }
1399
1400         return err;
1401 }
1402
1403 static const struct mmc_bus_ops mmc_ops = {
1404         .awake = mmc_awake,
1405         .sleep = mmc_sleep,
1406         .remove = mmc_remove,
1407         .detect = mmc_detect,
1408         .suspend = NULL,
1409         .resume = NULL,
1410         .power_restore = mmc_power_restore,
1411         .alive = mmc_alive,
1412 };
1413
1414 static const struct mmc_bus_ops mmc_ops_unsafe = {
1415         .awake = mmc_awake,
1416         .sleep = mmc_sleep,
1417         .remove = mmc_remove,
1418         .detect = mmc_detect,
1419         .suspend = mmc_suspend,
1420         .resume = mmc_resume,
1421         .power_restore = mmc_power_restore,
1422         .alive = mmc_alive,
1423 };
1424
1425 static void mmc_attach_bus_ops(struct mmc_host *host)
1426 {
1427         const struct mmc_bus_ops *bus_ops;
1428
1429         if (!mmc_card_is_removable(host))
1430                 bus_ops = &mmc_ops_unsafe;
1431         else
1432                 bus_ops = &mmc_ops;
1433         mmc_attach_bus(host, bus_ops);
1434 }
1435
1436 /*
1437  * Starting point for MMC card init.
1438  */
1439 int mmc_attach_mmc(struct mmc_host *host)
1440 {
1441         int err;
1442         u32 ocr;
1443
1444         BUG_ON(!host);
1445         WARN_ON(!host->claimed);
1446
1447         /* Set correct bus mode for MMC before attempting attach */
1448         if (!mmc_host_is_spi(host))
1449                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1450
1451         err = mmc_send_op_cond(host, 0, &ocr);
1452         if (err)
1453                 return err;
1454
1455         mmc_attach_bus_ops(host);
1456         if (host->ocr_avail_mmc)
1457                 host->ocr_avail = host->ocr_avail_mmc;
1458
1459         /*
1460          * We need to get OCR a different way for SPI.
1461          */
1462         if (mmc_host_is_spi(host)) {
1463                 err = mmc_spi_read_ocr(host, 1, &ocr);
1464                 if (err)
1465                         goto err;
1466         }
1467
1468         /*
1469          * Sanity check the voltages that the card claims to
1470          * support.
1471          */
1472         if (ocr & 0x7F) {
1473                 pr_warning("%s: card claims to support voltages "
1474                        "below the defined range. These will be ignored.\n",
1475                        mmc_hostname(host));
1476                 ocr &= ~0x7F;
1477         }
1478
1479         host->ocr = mmc_select_voltage(host, ocr);
1480
1481         /*
1482          * Can we support the voltage of the card?
1483          */
1484         if (!host->ocr) {
1485                 err = -EINVAL;
1486                 goto err;
1487         }
1488
1489         /*
1490          * Detect and init the card.
1491          */
1492         err = mmc_init_card(host, host->ocr, NULL);
1493         if (err)
1494                 goto err;
1495
1496         mmc_release_host(host);
1497         err = mmc_add_card(host->card);
1498         mmc_claim_host(host);
1499         if (err)
1500                 goto remove_card;
1501
1502         return 0;
1503
1504 remove_card:
1505         mmc_release_host(host);
1506         mmc_remove_card(host->card);
1507         mmc_claim_host(host);
1508         host->card = NULL;
1509 err:
1510         mmc_detach_bus(host);
1511
1512         pr_err("%s: error %d whilst initialising MMC card\n",
1513                 mmc_hostname(host), err);
1514
1515         return err;
1516 }