drivers/mmc/core/mmc.c

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