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