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         return err;
 721 }
 722
 723 /*
 724  * Selects the desired buswidth and switch to the HS200 mode
 725  * if bus width set without error
 726  */
 727 static int mmc_select_hs200(struct mmc_card *card)
 728 {
 729         int idx, err = -EINVAL;
 730         struct mmc_host *host;
 731         static unsigned ext_csd_bits[] = {
 732                 EXT_CSD_BUS_WIDTH_4,
 733                 EXT_CSD_BUS_WIDTH_8,
 734         };
 735         static unsigned bus_widths[] = {
 736                 MMC_BUS_WIDTH_4,
 737                 MMC_BUS_WIDTH_8,
 738         };
 739
 740         BUG_ON(!card);
 741
 742         host = card->host;
 743
 744         if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
 745                         host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
 746                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0);
 747
 748         if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V &&
 749                         host->caps2 & MMC_CAP2_HS200_1_8V_SDR)
 750                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 0);
 751
 752         /* If fails try again during next card power cycle */
 753         if (err)
 754                 goto err;
 755
 756         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0;
 757
 758         /*
 759          * Unlike SD, MMC cards dont have a configuration register to notify
 760          * supported bus width. So bus test command should be run to identify
 761          * the supported bus width or compare the ext csd values of current
 762          * bus width and ext csd values of 1 bit mode read earlier.
 763          */
 764         for (; idx >= 0; idx--) {
 765
 766                 /*
 767                  * Host is capable of 8bit transfer, then switch
 768                  * the device to work in 8bit transfer mode. If the
 769                  * mmc switch command returns error then switch to
 770                  * 4bit transfer mode. On success set the corresponding
 771                  * bus width on the host.
 772                  */
 773                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 774                                  EXT_CSD_BUS_WIDTH,
 775                                  ext_csd_bits[idx],
 776                                  card->ext_csd.generic_cmd6_time);
 777                 if (err)
 778                         continue;
 779
 780                 mmc_set_bus_width(card->host, bus_widths[idx]);
 781
 782                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 783                         err = mmc_compare_ext_csds(card, bus_widths[idx]);
 784                 else
 785                         err = mmc_bus_test(card, bus_widths[idx]);
 786                 if (!err)
 787                         break;
 788         }
 789
 790         /* switch to HS200 mode if bus width set successfully */
 791         if (!err)
 792                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 793                                  EXT_CSD_HS_TIMING, 2, 0);
 794 err:
 795         return err;
 796 }
 797
 798 /*
 799  * Handle the detection and initialisation of a card.
 800  *
 801  * In the case of a resume, "oldcard" will contain the card
 802  * we're trying to reinitialise.
 803  */
 804 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 805         struct mmc_card *oldcard)
 806 {
 807         struct mmc_card *card;
 808         int err, ddr = 0;
 809         u32 cid[4];
 810         unsigned int max_dtr;
 811         u32 rocr;
 812         u8 *ext_csd = NULL;
 813
 814         BUG_ON(!host);
 815         WARN_ON(!host->claimed);
 816
 817         /* Set correct bus mode for MMC before attempting init */
 818         if (!mmc_host_is_spi(host))
 819                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 820
 821         /* Initialization should be done at 3.3 V I/O voltage. */
 822         mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
 823
 824         /*
 825          * Since we're changing the OCR value, we seem to
 826          * need to tell some cards to go back to the idle
 827          * state.  We wait 1ms to give cards time to
 828          * respond.
 829          * mmc_go_idle is needed for eMMC that are asleep
 830          */
 831         mmc_go_idle(host);
 832
 833         /* The extra bit indicates that we support high capacity */
 834         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 835         if (err)
 836                 goto err;
 837
 838         /*
 839          * For SPI, enable CRC as appropriate.
 840          */
 841         if (mmc_host_is_spi(host)) {
 842                 err = mmc_spi_set_crc(host, use_spi_crc);
 843                 if (err)
 844                         goto err;
 845         }
 846
 847         /*
 848          * Fetch CID from card.
 849          */
 850         if (mmc_host_is_spi(host))
 851                 err = mmc_send_cid(host, cid);
 852         else
 853                 err = mmc_all_send_cid(host, cid);
 854         if (err)
 855                 goto err;
 856
 857         if (oldcard) {
 858                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 859                         err = -ENOENT;
 860                         goto err;
 861                 }
 862
 863                 card = oldcard;
 864         } else {
 865                 /*
 866                  * Allocate card structure.
 867                  */
 868                 card = mmc_alloc_card(host, &mmc_type);
 869                 if (IS_ERR(card)) {
 870                         err = PTR_ERR(card);
 871                         goto err;
 872                 }
 873
 874                 card->type = MMC_TYPE_MMC;
 875                 card->rca = 1;
 876                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 877         }
 878
 879         /*
 880          * For native busses:  set card RCA and quit open drain mode.
 881          */
 882         if (!mmc_host_is_spi(host)) {
 883                 err = mmc_set_relative_addr(card);
 884                 if (err)
 885                         goto free_card;
 886
 887                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 888         }
 889
 890         if (!oldcard) {
 891                 /*
 892                  * Fetch CSD from card.
 893                  */
 894                 err = mmc_send_csd(card, card->raw_csd);
 895                 if (err)
 896                         goto free_card;
 897
 898                 err = mmc_decode_csd(card);
 899                 if (err)
 900                         goto free_card;
 901                 err = mmc_decode_cid(card);
 902                 if (err)
 903                         goto free_card;
 904         }
 905
 906         /*
 907          * Select card, as all following commands rely on that.
 908          */
 909         if (!mmc_host_is_spi(host)) {
 910                 err = mmc_select_card(card);
 911                 if (err)
 912                         goto free_card;
 913         }
 914
 915         if (!oldcard) {
 916                 /*
 917                  * Fetch and process extended CSD.
 918                  */
 919
 920                 err = mmc_get_ext_csd(card, &ext_csd);
 921                 if (err)
 922                         goto free_card;
 923                 err = mmc_read_ext_csd(card, ext_csd);
 924                 if (err)
 925                         goto free_card;
 926
 927                 /* If doing byte addressing, check if required to do sector
 928                  * addressing.  Handle the case of <2GB cards needing sector
 929                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 930                  * ocr register has bit 30 set for sector addressing.
 931                  */
 932                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 933                         mmc_card_set_blockaddr(card);
 934
 935                 /* Erase size depends on CSD and Extended CSD */
 936                 mmc_set_erase_size(card);
 937         }
 938
 939         /*
 940          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 941          * bit.  This bit will be lost every time after a reset or power off.
 942          */
 943         if (card->ext_csd.enhanced_area_en ||
 944             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
 945                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 946                                  EXT_CSD_ERASE_GROUP_DEF, 1,
 947                                  card->ext_csd.generic_cmd6_time);
 948
 949                 if (err && err != -EBADMSG)
 950                         goto free_card;
 951
 952                 if (err) {
 953                         err = 0;
 954                         /*
 955                          * Just disable enhanced area off & sz
 956                          * will try to enable ERASE_GROUP_DEF
 957                          * during next time reinit
 958                          */
 959                         card->ext_csd.enhanced_area_offset = -EINVAL;
 960                         card->ext_csd.enhanced_area_size = -EINVAL;
 961                 } else {
 962                         card->ext_csd.erase_group_def = 1;
 963                         /*
 964                          * enable ERASE_GRP_DEF successfully.
 965                          * This will affect the erase size, so
 966                          * here need to reset erase size
 967                          */
 968                         mmc_set_erase_size(card);
 969                 }
 970         }
 971
 972         /*
 973          * Ensure eMMC user default partition is enabled
 974          */
 975         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
 976                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 977                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
 978                                  card->ext_csd.part_config,
 979                                  card->ext_csd.part_time);
 980                 if (err && err != -EBADMSG)
 981                         goto free_card;
 982         }
 983
 984         /*
 985          * If the host supports the power_off_notify capability then
 986          * set the notification byte in the ext_csd register of device
 987          */
 988         if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
 989             (card->ext_csd.rev >= 6)) {
 990                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 991                                  EXT_CSD_POWER_OFF_NOTIFICATION,
 992                                  EXT_CSD_POWER_ON,
 993                                  card->ext_csd.generic_cmd6_time);
 994                 if (err && err != -EBADMSG)
 995                         goto free_card;
 996
 997                 /*
 998                  * The err can be -EBADMSG or 0,
 999                  * so check for success and update the flag
1000                  */
1001                 if (!err)
1002                         card->poweroff_notify_state = MMC_POWERED_ON;
1003         }
1004
1005         /*
1006          * Activate high speed (if supported)
1007          */
1008         if (card->ext_csd.hs_max_dtr != 0) {
1009                 err = 0;
1010                 if (card->ext_csd.hs_max_dtr > 52000000 &&
1011                     host->caps2 & MMC_CAP2_HS200)
1012                         err = mmc_select_hs200(card);
1013                 else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
1014                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1015                                          EXT_CSD_HS_TIMING, 1,
1016                                          card->ext_csd.generic_cmd6_time);
1017
1018                 if (err && err != -EBADMSG)
1019                         goto free_card;
1020
1021                 if (err) {
1022                         pr_warning("%s: switch to highspeed failed\n",
1023                                mmc_hostname(card->host));
1024                         err = 0;
1025                 } else {
1026                         if (card->ext_csd.hs_max_dtr > 52000000 &&
1027                             host->caps2 & MMC_CAP2_HS200) {
1028                                 mmc_card_set_hs200(card);
1029                                 mmc_set_timing(card->host,
1030                                                MMC_TIMING_MMC_HS200);
1031                         } else {
1032                                 mmc_card_set_highspeed(card);
1033                                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1034                         }
1035                 }
1036         }
1037
1038         /*
1039          * Compute bus speed.
1040          */
1041         max_dtr = (unsigned int)-1;
1042
1043         if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
1044                 if (max_dtr > card->ext_csd.hs_max_dtr)
1045                         max_dtr = card->ext_csd.hs_max_dtr;
1046         } else if (max_dtr > card->csd.max_dtr) {
1047                 max_dtr = card->csd.max_dtr;
1048         }
1049
1050         mmc_set_clock(host, max_dtr);
1051
1052         /*
1053          * Indicate DDR mode (if supported).
1054          */
1055         if (mmc_card_highspeed(card)) {
1056                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
1057                         && ((host->caps & (MMC_CAP_1_8V_DDR |
1058                              MMC_CAP_UHS_DDR50))
1059                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
1060                                 ddr = MMC_1_8V_DDR_MODE;
1061                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1062                         && ((host->caps & (MMC_CAP_1_2V_DDR |
1063                              MMC_CAP_UHS_DDR50))
1064                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
1065                                 ddr = MMC_1_2V_DDR_MODE;
1066         }
1067
1068         /*
1069          * Indicate HS200 SDR mode (if supported).
1070          */
1071         if (mmc_card_hs200(card)) {
1072                 u32 ext_csd_bits;
1073                 u32 bus_width = card->host->ios.bus_width;
1074
1075                 /*
1076                  * For devices supporting HS200 mode, the bus width has
1077                  * to be set before executing the tuning function. If
1078                  * set before tuning, then device will respond with CRC
1079                  * errors for responses on CMD line. So for HS200 the
1080                  * sequence will be
1081                  * 1. set bus width 4bit / 8 bit (1 bit not supported)
1082                  * 2. switch to HS200 mode
1083                  * 3. set the clock to > 52Mhz <=200MHz and
1084                  * 4. execute tuning for HS200
1085                  */
1086                 if ((host->caps2 & MMC_CAP2_HS200) &&
1087                     card->host->ops->execute_tuning) {
1088                         mmc_host_clk_hold(card->host);
1089                         err = card->host->ops->execute_tuning(card->host,
1090                                 MMC_SEND_TUNING_BLOCK_HS200);
1091                         mmc_host_clk_release(card->host);
1092                 }
1093                 if (err) {
1094                         pr_warning("%s: tuning execution failed\n",
1095                                    mmc_hostname(card->host));
1096                         goto err;
1097                 }
1098
1099                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1100                                 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
1101                 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
1102                 if (err)
1103                         pr_warning("%s: power class selection to bus width %d"
1104                                    " failed\n", mmc_hostname(card->host),
1105                                    1 << bus_width);
1106         }
1107
1108         /*
1109          * Activate wide bus and DDR (if supported).
1110          */
1111         if (!mmc_card_hs200(card) &&
1112             (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
1113             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
1114                 static unsigned ext_csd_bits[][2] = {
1115                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
1116                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
1117                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
1118                 };
1119                 static unsigned bus_widths[] = {
1120                         MMC_BUS_WIDTH_8,
1121                         MMC_BUS_WIDTH_4,
1122                         MMC_BUS_WIDTH_1
1123                 };
1124                 unsigned idx, bus_width = 0;
1125
1126                 if (host->caps & MMC_CAP_8_BIT_DATA)
1127                         idx = 0;
1128                 else
1129                         idx = 1;
1130                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1131                         bus_width = bus_widths[idx];
1132                         if (bus_width == MMC_BUS_WIDTH_1)
1133                                 ddr = 0; /* no DDR for 1-bit width */
1134                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
1135                                                     ext_csd);
1136                         if (err)
1137                                 pr_warning("%s: power class selection to "
1138                                            "bus width %d failed\n",
1139                                            mmc_hostname(card->host),
1140                                            1 << bus_width);
1141
1142                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1143                                          EXT_CSD_BUS_WIDTH,
1144                                          ext_csd_bits[idx][0],
1145                                          card->ext_csd.generic_cmd6_time);
1146                         if (!err) {
1147                                 mmc_set_bus_width(card->host, bus_width);
1148
1149                                 /*
1150                                  * If controller can't handle bus width test,
1151                                  * compare ext_csd previously read in 1 bit mode
1152                                  * against ext_csd at new bus width
1153                                  */
1154                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1155                                         err = mmc_compare_ext_csds(card,
1156                                                 bus_width);
1157                                 else
1158                                         err = mmc_bus_test(card, bus_width);
1159                                 if (!err)
1160                                         break;
1161                         }
1162                 }
1163
1164                 if (!err && ddr) {
1165                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1166                                                     ext_csd);
1167                         if (err)
1168                                 pr_warning("%s: power class selection to "
1169                                            "bus width %d ddr %d failed\n",
1170                                            mmc_hostname(card->host),
1171                                            1 << bus_width, ddr);
1172
1173                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1174                                          EXT_CSD_BUS_WIDTH,
1175                                          ext_csd_bits[idx][1],
1176                                          card->ext_csd.generic_cmd6_time);
1177                 }
1178                 if (err) {
1179                         pr_warning("%s: switch to bus width %d ddr %d "
1180                                 "failed\n", mmc_hostname(card->host),
1181                                 1 << bus_width, ddr);
1182                         goto free_card;
1183                 } else if (ddr) {
1184                         /*
1185                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1186                          * signaling.
1187                          *
1188                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1189                          *
1190                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1191                          * in the JEDEC spec for DDR.
1192                          *
1193                          * Do not force change in vccq since we are obviously
1194                          * working and no change to vccq is needed.
1195                          *
1196                          * WARNING: eMMC rules are NOT the same as SD DDR
1197                          */
1198                         if (ddr == MMC_1_2V_DDR_MODE) {
1199                                 err = mmc_set_signal_voltage(host,
1200                                         MMC_SIGNAL_VOLTAGE_120, 0);
1201                                 if (err)
1202                                         goto err;
1203                         }
1204                         mmc_card_set_ddr_mode(card);
1205                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1206                         mmc_set_bus_width(card->host, bus_width);
1207                 }
1208         }
1209
1210         /*
1211          * Enable HPI feature (if supported)
1212          */
1213         if (card->ext_csd.hpi) {
1214                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1215                                 EXT_CSD_HPI_MGMT, 1,
1216                                 card->ext_csd.generic_cmd6_time);
1217                 if (err && err != -EBADMSG)
1218                         goto free_card;
1219                 if (err) {
1220                         pr_warning("%s: Enabling HPI failed\n",
1221                                    mmc_hostname(card->host));
1222                         err = 0;
1223                 } else
1224                         card->ext_csd.hpi_en = 1;
1225         }
1226
1227         /*
1228          * If cache size is higher than 0, this indicates
1229          * the existence of cache and it can be turned on.
1230          */
1231         if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1232                         card->ext_csd.cache_size > 0) {
1233                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1234                                 EXT_CSD_CACHE_CTRL, 1,
1235                                 card->ext_csd.generic_cmd6_time);
1236                 if (err && err != -EBADMSG)
1237                         goto free_card;
1238
1239                 /*
1240                  * Only if no error, cache is turned on successfully.
1241                  */
1242                 if (err) {
1243                         pr_warning("%s: Cache is supported, "
1244                                         "but failed to turn on (%d)\n",
1245                                         mmc_hostname(card->host), err);
1246                         card->ext_csd.cache_ctrl = 0;
1247                         err = 0;
1248                 } else {
1249                         card->ext_csd.cache_ctrl = 1;
1250                 }
1251         }
1252
1253         if (!oldcard)
1254                 host->card = card;
1255
1256         mmc_free_ext_csd(ext_csd);
1257         return 0;
1258
1259 free_card:
1260         if (!oldcard)
1261                 mmc_remove_card(card);
1262 err:
1263         mmc_free_ext_csd(ext_csd);
1264
1265         return err;
1266 }
1267
1268 /*
1269  * Host is being removed. Free up the current card.
1270  */
1271 static void mmc_remove(struct mmc_host *host)
1272 {
1273         BUG_ON(!host);
1274         BUG_ON(!host->card);
1275
1276         mmc_remove_card(host->card);
1277         host->card = NULL;
1278 }
1279
1280 /*
1281  * Card detection - card is alive.
1282  */
1283 static int mmc_alive(struct mmc_host *host)
1284 {
1285         return mmc_send_status(host->card, NULL);
1286 }
1287
1288 /*
1289  * Card detection callback from host.
1290  */
1291 static void mmc_detect(struct mmc_host *host)
1292 {
1293         int err;
1294
1295         BUG_ON(!host);
1296         BUG_ON(!host->card);
1297
1298         mmc_claim_host(host);
1299
1300         /*
1301          * Just check if our card has been removed.
1302          */
1303         err = _mmc_detect_card_removed(host);
1304
1305         mmc_release_host(host);
1306
1307         if (err) {
1308                 mmc_remove(host);
1309
1310                 mmc_claim_host(host);
1311                 mmc_detach_bus(host);
1312                 mmc_power_off(host);
1313                 mmc_release_host(host);
1314         }
1315 }
1316
1317 /*
1318  * Suspend callback from host.
1319  */
1320 static int mmc_suspend(struct mmc_host *host)
1321 {
1322         int err = 0;
1323
1324         BUG_ON(!host);
1325         BUG_ON(!host->card);
1326
1327         mmc_claim_host(host);
1328         if (mmc_card_can_sleep(host)) {
1329                 err = mmc_card_sleep(host);
1330                 if (!err)
1331                         mmc_card_set_sleep(host->card);
1332         } else if (!mmc_host_is_spi(host))
1333                 err = mmc_deselect_cards(host);
1334         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1335         mmc_release_host(host);
1336
1337         return err;
1338 }
1339
1340 /*
1341  * Resume callback from host.
1342  *
1343  * This function tries to determine if the same card is still present
1344  * and, if so, restore all state to it.
1345  */
1346 static int mmc_resume(struct mmc_host *host)
1347 {
1348         int err;
1349
1350         BUG_ON(!host);
1351         BUG_ON(!host->card);
1352
1353         mmc_claim_host(host);
1354         if (mmc_card_is_sleep(host->card)) {
1355                 err = mmc_card_awake(host);
1356                 mmc_card_clr_sleep(host->card);
1357         } else
1358                 err = mmc_init_card(host, host->ocr, host->card);
1359         mmc_release_host(host);
1360
1361         return err;
1362 }
1363
1364 static int mmc_power_restore(struct mmc_host *host)
1365 {
1366         int ret;
1367
1368         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1369         mmc_card_clr_sleep(host->card);
1370         mmc_claim_host(host);
1371         ret = mmc_init_card(host, host->ocr, host->card);
1372         mmc_release_host(host);
1373
1374         return ret;
1375 }
1376
1377 static int mmc_sleep(struct mmc_host *host)
1378 {
1379         struct mmc_card *card = host->card;
1380         int err = -ENOSYS;
1381
1382         if (card && card->ext_csd.rev >= 3) {
1383                 err = mmc_card_sleepawake(host, 1);
1384                 if (err < 0)
1385                         pr_debug("%s: Error %d while putting card into sleep",
1386                                  mmc_hostname(host), err);
1387         }
1388
1389         return err;
1390 }
1391
1392 static int mmc_awake(struct mmc_host *host)
1393 {
1394         struct mmc_card *card = host->card;
1395         int err = -ENOSYS;
1396
1397         if (card && card->ext_csd.rev >= 3) {
1398                 err = mmc_card_sleepawake(host, 0);
1399                 if (err < 0)
1400                         pr_debug("%s: Error %d while awaking sleeping card",
1401                                  mmc_hostname(host), err);
1402         }
1403
1404         return err;
1405 }
1406
1407 static const struct mmc_bus_ops mmc_ops = {
1408         .awake = mmc_awake,
1409         .sleep = mmc_sleep,
1410         .remove = mmc_remove,
1411         .detect = mmc_detect,
1412         .suspend = NULL,
1413         .resume = NULL,
1414         .power_restore = mmc_power_restore,
1415         .alive = mmc_alive,
1416 };
1417
1418 static const struct mmc_bus_ops mmc_ops_unsafe = {
1419         .awake = mmc_awake,
1420         .sleep = mmc_sleep,
1421         .remove = mmc_remove,
1422         .detect = mmc_detect,
1423         .suspend = mmc_suspend,
1424         .resume = mmc_resume,
1425         .power_restore = mmc_power_restore,
1426         .alive = mmc_alive,
1427 };
1428
1429 static void mmc_attach_bus_ops(struct mmc_host *host)
1430 {
1431         const struct mmc_bus_ops *bus_ops;
1432
1433         if (!mmc_card_is_removable(host))
1434                 bus_ops = &mmc_ops_unsafe;
1435         else
1436                 bus_ops = &mmc_ops;
1437         mmc_attach_bus(host, bus_ops);
1438 }
1439
1440 /*
1441  * Starting point for MMC card init.
1442  */
1443 int mmc_attach_mmc(struct mmc_host *host)
1444 {
1445         int err;
1446         u32 ocr;
1447
1448         BUG_ON(!host);
1449         WARN_ON(!host->claimed);
1450
1451         /* Set correct bus mode for MMC before attempting attach */
1452         if (!mmc_host_is_spi(host))
1453                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1454
1455         err = mmc_send_op_cond(host, 0, &ocr);
1456         if (err)
1457                 return err;
1458
1459         mmc_attach_bus_ops(host);
1460         if (host->ocr_avail_mmc)
1461                 host->ocr_avail = host->ocr_avail_mmc;
1462
1463         /*
1464          * We need to get OCR a different way for SPI.
1465          */
1466         if (mmc_host_is_spi(host)) {
1467                 err = mmc_spi_read_ocr(host, 1, &ocr);
1468                 if (err)
1469                         goto err;
1470         }
1471
1472         /*
1473          * Sanity check the voltages that the card claims to
1474          * support.
1475          */
1476         if (ocr & 0x7F) {
1477                 pr_warning("%s: card claims to support voltages "
1478                        "below the defined range. These will be ignored.\n",
1479                        mmc_hostname(host));
1480                 ocr &= ~0x7F;
1481         }
1482
1483         host->ocr = mmc_select_voltage(host, ocr);
1484
1485         /*
1486          * Can we support the voltage of the card?
1487          */
1488         if (!host->ocr) {
1489                 err = -EINVAL;
1490                 goto err;
1491         }
1492
1493         /*
1494          * Detect and init the card.
1495          */
1496         err = mmc_init_card(host, host->ocr, NULL);
1497         if (err)
1498                 goto err;
1499
1500         mmc_release_host(host);
1501         err = mmc_add_card(host->card);
1502         mmc_claim_host(host);
1503         if (err)
1504                 goto remove_card;
1505
1506         return 0;
1507
1508 remove_card:
1509         mmc_release_host(host);
1510         mmc_remove_card(host->card);
1511         mmc_claim_host(host);
1512         host->card = NULL;
1513 err:
1514         mmc_detach_bus(host);
1515
1516         pr_err("%s: error %d whilst initialising MMC card\n",
1517                 mmc_hostname(host), err);
1518
1519         return err;
1520 }