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                 printk(KERN_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                 printk(KERN_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                 printk(KERN_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                         printk(KERN_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                         printk(KERN_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;
 243
 244         BUG_ON(!card);
 245
 246         if (!ext_csd)
 247                 return 0;
 248
 249         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 250         if (card->csd.structure == 3) {
 251                 int ext_csd_struct = ext_csd[EXT_CSD_STRUCTURE];
 252                 if (ext_csd_struct > 2) {
 253                         printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
 254                                 "version %d\n", mmc_hostname(card->host),
 255                                         ext_csd_struct);
 256                         err = -EINVAL;
 257                         goto out;
 258                 }
 259         }
 260
 261         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 262         if (card->ext_csd.rev > 5) {
 263                 printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
 264                         mmc_hostname(card->host), card->ext_csd.rev);
 265                 err = -EINVAL;
 266                 goto out;
 267         }
 268
 269         if (card->ext_csd.rev >= 2) {
 270                 card->ext_csd.sectors =
 271                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 272                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 273                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 274                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 275
 276                 /* Cards with density > 2GiB are sector addressed */
 277                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 278                         mmc_card_set_blockaddr(card);
 279         }
 280
 281         switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
 282         case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
 283              EXT_CSD_CARD_TYPE_26:
 284                 card->ext_csd.hs_max_dtr = 52000000;
 285                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
 286                 break;
 287         case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
 288              EXT_CSD_CARD_TYPE_26:
 289                 card->ext_csd.hs_max_dtr = 52000000;
 290                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
 291                 break;
 292         case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
 293              EXT_CSD_CARD_TYPE_26:
 294                 card->ext_csd.hs_max_dtr = 52000000;
 295                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
 296                 break;
 297         case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
 298                 card->ext_csd.hs_max_dtr = 52000000;
 299                 break;
 300         case EXT_CSD_CARD_TYPE_26:
 301                 card->ext_csd.hs_max_dtr = 26000000;
 302                 break;
 303         default:
 304                 /* MMC v4 spec says this cannot happen */
 305                 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
 306                         "support any high-speed modes.\n",
 307                         mmc_hostname(card->host));
 308         }
 309
 310         if (card->ext_csd.rev >= 3) {
 311                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 312                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 313
 314                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 315                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 316
 317                 /* Sleep / awake timeout in 100ns units */
 318                 if (sa_shift > 0 && sa_shift <= 0x17)
 319                         card->ext_csd.sa_timeout =
 320                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 321                 card->ext_csd.erase_group_def =
 322                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 323                 card->ext_csd.hc_erase_timeout = 300 *
 324                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 325                 card->ext_csd.hc_erase_size =
 326                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 327
 328                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 329
 330                 /*
 331                  * There are two boot regions of equal size, defined in
 332                  * multiples of 128K.
 333                  */
 334                 card->ext_csd.boot_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 335         }
 336
 337         if (card->ext_csd.rev >= 4) {
 338                 /*
 339                  * Enhanced area feature support -- check whether the eMMC
 340                  * card has the Enhanced area enabled.  If so, export enhanced
 341                  * area offset and size to user by adding sysfs interface.
 342                  */
 343                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 344                                 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 345                         u8 hc_erase_grp_sz =
 346                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 347                         u8 hc_wp_grp_sz =
 348                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 349
 350                         card->ext_csd.enhanced_area_en = 1;
 351                         /*
 352                          * calculate the enhanced data area offset, in bytes
 353                          */
 354                         card->ext_csd.enhanced_area_offset =
 355                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
 356                                 (ext_csd[137] << 8) + ext_csd[136];
 357                         if (mmc_card_blockaddr(card))
 358                                 card->ext_csd.enhanced_area_offset <<= 9;
 359                         /*
 360                          * calculate the enhanced data area size, in kilobytes
 361                          */
 362                         card->ext_csd.enhanced_area_size =
 363                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 364                                 ext_csd[140];
 365                         card->ext_csd.enhanced_area_size *=
 366                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 367                         card->ext_csd.enhanced_area_size <<= 9;
 368                 } else {
 369                         /*
 370                          * If the enhanced area is not enabled, disable these
 371                          * device attributes.
 372                          */
 373                         card->ext_csd.enhanced_area_offset = -EINVAL;
 374                         card->ext_csd.enhanced_area_size = -EINVAL;
 375                 }
 376                 card->ext_csd.sec_trim_mult =
 377                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 378                 card->ext_csd.sec_erase_mult =
 379                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 380                 card->ext_csd.sec_feature_support =
 381                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 382                 card->ext_csd.trim_timeout = 300 *
 383                         ext_csd[EXT_CSD_TRIM_MULT];
 384         }
 385
 386         if (card->ext_csd.rev >= 5)
 387                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 388
 389         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 390                 card->erased_byte = 0xFF;
 391         else
 392                 card->erased_byte = 0x0;
 393
 394 out:
 395         return err;
 396 }
 397
 398 static inline void mmc_free_ext_csd(u8 *ext_csd)
 399 {
 400         kfree(ext_csd);
 401 }
 402
 403
 404 static int mmc_compare_ext_csds(struct mmc_card *card, u8 *ext_csd,
 405                         unsigned bus_width)
 406 {
 407         u8 *bw_ext_csd;
 408         int err;
 409
 410         err = mmc_get_ext_csd(card, &bw_ext_csd);
 411         if (err)
 412                 return err;
 413
 414         if ((ext_csd == NULL || bw_ext_csd == NULL)) {
 415                 if (bus_width != MMC_BUS_WIDTH_1)
 416                         err = -EINVAL;
 417                 goto out;
 418         }
 419
 420         if (bus_width == MMC_BUS_WIDTH_1)
 421                 goto out;
 422
 423         /* only compare read only fields */
 424         err = (!(ext_csd[EXT_CSD_PARTITION_SUPPORT] ==
 425                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 426                 (ext_csd[EXT_CSD_ERASED_MEM_CONT] ==
 427                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 428                 (ext_csd[EXT_CSD_REV] ==
 429                         bw_ext_csd[EXT_CSD_REV]) &&
 430                 (ext_csd[EXT_CSD_STRUCTURE] ==
 431                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 432                 (ext_csd[EXT_CSD_CARD_TYPE] ==
 433                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 434                 (ext_csd[EXT_CSD_S_A_TIMEOUT] ==
 435                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 436                 (ext_csd[EXT_CSD_HC_WP_GRP_SIZE] ==
 437                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 438                 (ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT] ==
 439                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 440                 (ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] ==
 441                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 442                 (ext_csd[EXT_CSD_SEC_TRIM_MULT] ==
 443                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 444                 (ext_csd[EXT_CSD_SEC_ERASE_MULT] ==
 445                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 446                 (ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT] ==
 447                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 448                 (ext_csd[EXT_CSD_TRIM_MULT] ==
 449                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 450                 memcmp(&ext_csd[EXT_CSD_SEC_CNT],
 451                        &bw_ext_csd[EXT_CSD_SEC_CNT],
 452                        4) != 0);
 453         if (err)
 454                 err = -EINVAL;
 455
 456 out:
 457         mmc_free_ext_csd(bw_ext_csd);
 458         return err;
 459 }
 460
 461 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 462         card->raw_cid[2], card->raw_cid[3]);
 463 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 464         card->raw_csd[2], card->raw_csd[3]);
 465 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 466 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 467 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 468 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 469 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 470 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 471 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 472 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 473 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 474 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 475                 card->ext_csd.enhanced_area_offset);
 476 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 477
 478 static struct attribute *mmc_std_attrs[] = {
 479         &dev_attr_cid.attr,
 480         &dev_attr_csd.attr,
 481         &dev_attr_date.attr,
 482         &dev_attr_erase_size.attr,
 483         &dev_attr_preferred_erase_size.attr,
 484         &dev_attr_fwrev.attr,
 485         &dev_attr_hwrev.attr,
 486         &dev_attr_manfid.attr,
 487         &dev_attr_name.attr,
 488         &dev_attr_oemid.attr,
 489         &dev_attr_serial.attr,
 490         &dev_attr_enhanced_area_offset.attr,
 491         &dev_attr_enhanced_area_size.attr,
 492         NULL,
 493 };
 494
 495 static struct attribute_group mmc_std_attr_group = {
 496         .attrs = mmc_std_attrs,
 497 };
 498
 499 static const struct attribute_group *mmc_attr_groups[] = {
 500         &mmc_std_attr_group,
 501         NULL,
 502 };
 503
 504 static struct device_type mmc_type = {
 505         .groups = mmc_attr_groups,
 506 };
 507
 508 /*
 509  * Handle the detection and initialisation of a card.
 510  *
 511  * In the case of a resume, "oldcard" will contain the card
 512  * we're trying to reinitialise.
 513  */
 514 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 515         struct mmc_card *oldcard)
 516 {
 517         struct mmc_card *card;
 518         int err, ddr = 0;
 519         u32 cid[4];
 520         unsigned int max_dtr;
 521         u32 rocr;
 522         u8 *ext_csd = NULL;
 523
 524         BUG_ON(!host);
 525         WARN_ON(!host->claimed);
 526
 527         /*
 528          * Since we're changing the OCR value, we seem to
 529          * need to tell some cards to go back to the idle
 530          * state.  We wait 1ms to give cards time to
 531          * respond.
 532          */
 533         mmc_go_idle(host);
 534
 535         /* The extra bit indicates that we support high capacity */
 536         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 537         if (err)
 538                 goto err;
 539
 540         /*
 541          * For SPI, enable CRC as appropriate.
 542          */
 543         if (mmc_host_is_spi(host)) {
 544                 err = mmc_spi_set_crc(host, use_spi_crc);
 545                 if (err)
 546                         goto err;
 547         }
 548
 549         /*
 550          * Fetch CID from card.
 551          */
 552         if (mmc_host_is_spi(host))
 553                 err = mmc_send_cid(host, cid);
 554         else
 555                 err = mmc_all_send_cid(host, cid);
 556         if (err)
 557                 goto err;
 558
 559         if (oldcard) {
 560                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 561                         err = -ENOENT;
 562                         goto err;
 563                 }
 564
 565                 card = oldcard;
 566         } else {
 567                 /*
 568                  * Allocate card structure.
 569                  */
 570                 card = mmc_alloc_card(host, &mmc_type);
 571                 if (IS_ERR(card)) {
 572                         err = PTR_ERR(card);
 573                         goto err;
 574                 }
 575
 576                 card->type = MMC_TYPE_MMC;
 577                 card->rca = 1;
 578                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 579         }
 580
 581         /*
 582          * For native busses:  set card RCA and quit open drain mode.
 583          */
 584         if (!mmc_host_is_spi(host)) {
 585                 err = mmc_set_relative_addr(card);
 586                 if (err)
 587                         goto free_card;
 588
 589                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 590         }
 591
 592         if (!oldcard) {
 593                 /*
 594                  * Fetch CSD from card.
 595                  */
 596                 err = mmc_send_csd(card, card->raw_csd);
 597                 if (err)
 598                         goto free_card;
 599
 600                 err = mmc_decode_csd(card);
 601                 if (err)
 602                         goto free_card;
 603                 err = mmc_decode_cid(card);
 604                 if (err)
 605                         goto free_card;
 606         }
 607
 608         /*
 609          * Select card, as all following commands rely on that.
 610          */
 611         if (!mmc_host_is_spi(host)) {
 612                 err = mmc_select_card(card);
 613                 if (err)
 614                         goto free_card;
 615         }
 616
 617         if (!oldcard) {
 618                 /*
 619                  * Fetch and process extended CSD.
 620                  */
 621
 622                 err = mmc_get_ext_csd(card, &ext_csd);
 623                 if (err)
 624                         goto free_card;
 625                 err = mmc_read_ext_csd(card, ext_csd);
 626                 if (err)
 627                         goto free_card;
 628
 629                 /* If doing byte addressing, check if required to do sector
 630                  * addressing.  Handle the case of <2GB cards needing sector
 631                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 632                  * ocr register has bit 30 set for sector addressing.
 633                  */
 634                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 635                         mmc_card_set_blockaddr(card);
 636
 637                 /* Erase size depends on CSD and Extended CSD */
 638                 mmc_set_erase_size(card);
 639         }
 640
 641         /*
 642          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 643          * bit.  This bit will be lost every time after a reset or power off.
 644          */
 645         if (card->ext_csd.enhanced_area_en) {
 646                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 647                                  EXT_CSD_ERASE_GROUP_DEF, 1, 0);
 648
 649                 if (err && err != -EBADMSG)
 650                         goto free_card;
 651
 652                 if (err) {
 653                         err = 0;
 654                         /*
 655                          * Just disable enhanced area off & sz
 656                          * will try to enable ERASE_GROUP_DEF
 657                          * during next time reinit
 658                          */
 659                         card->ext_csd.enhanced_area_offset = -EINVAL;
 660                         card->ext_csd.enhanced_area_size = -EINVAL;
 661                 } else {
 662                         card->ext_csd.erase_group_def = 1;
 663                         /*
 664                          * enable ERASE_GRP_DEF successfully.
 665                          * This will affect the erase size, so
 666                          * here need to reset erase size
 667                          */
 668                         mmc_set_erase_size(card);
 669                 }
 670         }
 671
 672         /*
 673          * Ensure eMMC user default partition is enabled
 674          */
 675         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
 676                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 677                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
 678                                  card->ext_csd.part_config,
 679                                  card->ext_csd.part_time);
 680                 if (err && err != -EBADMSG)
 681                         goto free_card;
 682         }
 683
 684         /*
 685          * Activate high speed (if supported)
 686          */
 687         if ((card->ext_csd.hs_max_dtr != 0) &&
 688                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
 689                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 690                                  EXT_CSD_HS_TIMING, 1, 0);
 691                 if (err && err != -EBADMSG)
 692                         goto free_card;
 693
 694                 if (err) {
 695                         printk(KERN_WARNING "%s: switch to highspeed failed\n",
 696                                mmc_hostname(card->host));
 697                         err = 0;
 698                 } else {
 699                         mmc_card_set_highspeed(card);
 700                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
 701                 }
 702         }
 703
 704         /*
 705          * Compute bus speed.
 706          */
 707         max_dtr = (unsigned int)-1;
 708
 709         if (mmc_card_highspeed(card)) {
 710                 if (max_dtr > card->ext_csd.hs_max_dtr)
 711                         max_dtr = card->ext_csd.hs_max_dtr;
 712         } else if (max_dtr > card->csd.max_dtr) {
 713                 max_dtr = card->csd.max_dtr;
 714         }
 715
 716         mmc_set_clock(host, max_dtr);
 717
 718         /*
 719          * Indicate DDR mode (if supported).
 720          */
 721         if (mmc_card_highspeed(card)) {
 722                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
 723                         && ((host->caps & (MMC_CAP_1_8V_DDR |
 724                              MMC_CAP_UHS_DDR50))
 725                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
 726                                 ddr = MMC_1_8V_DDR_MODE;
 727                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
 728                         && ((host->caps & (MMC_CAP_1_2V_DDR |
 729                              MMC_CAP_UHS_DDR50))
 730                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
 731                                 ddr = MMC_1_2V_DDR_MODE;
 732         }
 733
 734         /*
 735          * Activate wide bus and DDR (if supported).
 736          */
 737         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
 738             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
 739                 static unsigned ext_csd_bits[][2] = {
 740                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
 741                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
 742                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
 743                 };
 744                 static unsigned bus_widths[] = {
 745                         MMC_BUS_WIDTH_8,
 746                         MMC_BUS_WIDTH_4,
 747                         MMC_BUS_WIDTH_1
 748                 };
 749                 unsigned idx, bus_width = 0;
 750
 751                 if (host->caps & MMC_CAP_8_BIT_DATA)
 752                         idx = 0;
 753                 else
 754                         idx = 1;
 755                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 756                         bus_width = bus_widths[idx];
 757                         if (bus_width == MMC_BUS_WIDTH_1)
 758                                 ddr = 0; /* no DDR for 1-bit width */
 759                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 760                                          EXT_CSD_BUS_WIDTH,
 761                                          ext_csd_bits[idx][0],
 762                                          0);
 763                         if (!err) {
 764                                 mmc_set_bus_width(card->host, bus_width);
 765
 766                                 /*
 767                                  * If controller can't handle bus width test,
 768                                  * compare ext_csd previously read in 1 bit mode
 769                                  * against ext_csd at new bus width
 770                                  */
 771                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 772                                         err = mmc_compare_ext_csds(card,
 773                                                 ext_csd,
 774                                                 bus_width);
 775                                 else
 776                                         err = mmc_bus_test(card, bus_width);
 777                                 if (!err)
 778                                         break;
 779                         }
 780                 }
 781
 782                 if (!err && ddr) {
 783                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 784                                          EXT_CSD_BUS_WIDTH,
 785                                          ext_csd_bits[idx][1],
 786                                          0);
 787                 }
 788                 if (err) {
 789                         printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
 790                                 "failed\n", mmc_hostname(card->host),
 791                                 1 << bus_width, ddr);
 792                         goto free_card;
 793                 } else if (ddr) {
 794                         /*
 795                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
 796                          * signaling.
 797                          *
 798                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
 799                          *
 800                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
 801                          * in the JEDEC spec for DDR.
 802                          *
 803                          * Do not force change in vccq since we are obviously
 804                          * working and no change to vccq is needed.
 805                          *
 806                          * WARNING: eMMC rules are NOT the same as SD DDR
 807                          */
 808                         if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
 809                                 err = mmc_set_signal_voltage(host,
 810                                         MMC_SIGNAL_VOLTAGE_120, 0);
 811                                 if (err)
 812                                         goto err;
 813                         }
 814                         mmc_card_set_ddr_mode(card);
 815                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
 816                         mmc_set_bus_width(card->host, bus_width);
 817                 }
 818         }
 819
 820         if (!oldcard)
 821                 host->card = card;
 822
 823         mmc_free_ext_csd(ext_csd);
 824         return 0;
 825
 826 free_card:
 827         if (!oldcard)
 828                 mmc_remove_card(card);
 829 err:
 830         mmc_free_ext_csd(ext_csd);
 831
 832         return err;
 833 }
 834
 835 /*
 836  * Host is being removed. Free up the current card.
 837  */
 838 static void mmc_remove(struct mmc_host *host)
 839 {
 840         BUG_ON(!host);
 841         BUG_ON(!host->card);
 842
 843         mmc_remove_card(host->card);
 844         host->card = NULL;
 845 }
 846
 847 /*
 848  * Card detection callback from host.
 849  */
 850 static void mmc_detect(struct mmc_host *host)
 851 {
 852         int err;
 853
 854         BUG_ON(!host);
 855         BUG_ON(!host->card);
 856
 857         mmc_claim_host(host);
 858
 859         /*
 860          * Just check if our card has been removed.
 861          */
 862         err = mmc_send_status(host->card, NULL);
 863
 864         mmc_release_host(host);
 865
 866         if (err) {
 867                 mmc_remove(host);
 868
 869                 mmc_claim_host(host);
 870                 mmc_detach_bus(host);
 871                 mmc_release_host(host);
 872         }
 873 }
 874
 875 /*
 876  * Suspend callback from host.
 877  */
 878 static int mmc_suspend(struct mmc_host *host)
 879 {
 880         BUG_ON(!host);
 881         BUG_ON(!host->card);
 882
 883         mmc_claim_host(host);
 884         if (!mmc_host_is_spi(host))
 885                 mmc_deselect_cards(host);
 886         host->card->state &= ~MMC_STATE_HIGHSPEED;
 887         mmc_release_host(host);
 888
 889         return 0;
 890 }
 891
 892 /*
 893  * Resume callback from host.
 894  *
 895  * This function tries to determine if the same card is still present
 896  * and, if so, restore all state to it.
 897  */
 898 static int mmc_resume(struct mmc_host *host)
 899 {
 900         int err;
 901
 902         BUG_ON(!host);
 903         BUG_ON(!host->card);
 904
 905         mmc_claim_host(host);
 906         err = mmc_init_card(host, host->ocr, host->card);
 907         mmc_release_host(host);
 908
 909         return err;
 910 }
 911
 912 static int mmc_power_restore(struct mmc_host *host)
 913 {
 914         int ret;
 915
 916         host->card->state &= ~MMC_STATE_HIGHSPEED;
 917         mmc_claim_host(host);
 918         ret = mmc_init_card(host, host->ocr, host->card);
 919         mmc_release_host(host);
 920
 921         return ret;
 922 }
 923
 924 static int mmc_sleep(struct mmc_host *host)
 925 {
 926         struct mmc_card *card = host->card;
 927         int err = -ENOSYS;
 928
 929         if (card && card->ext_csd.rev >= 3) {
 930                 err = mmc_card_sleepawake(host, 1);
 931                 if (err < 0)
 932                         pr_debug("%s: Error %d while putting card into sleep",
 933                                  mmc_hostname(host), err);
 934         }
 935
 936         return err;
 937 }
 938
 939 static int mmc_awake(struct mmc_host *host)
 940 {
 941         struct mmc_card *card = host->card;
 942         int err = -ENOSYS;
 943
 944         if (card && card->ext_csd.rev >= 3) {
 945                 err = mmc_card_sleepawake(host, 0);
 946                 if (err < 0)
 947                         pr_debug("%s: Error %d while awaking sleeping card",
 948                                  mmc_hostname(host), err);
 949         }
 950
 951         return err;
 952 }
 953
 954 static const struct mmc_bus_ops mmc_ops = {
 955         .awake = mmc_awake,
 956         .sleep = mmc_sleep,
 957         .remove = mmc_remove,
 958         .detect = mmc_detect,
 959         .suspend = NULL,
 960         .resume = NULL,
 961         .power_restore = mmc_power_restore,
 962 };
 963
 964 static const struct mmc_bus_ops mmc_ops_unsafe = {
 965         .awake = mmc_awake,
 966         .sleep = mmc_sleep,
 967         .remove = mmc_remove,
 968         .detect = mmc_detect,
 969         .suspend = mmc_suspend,
 970         .resume = mmc_resume,
 971         .power_restore = mmc_power_restore,
 972 };
 973
 974 static void mmc_attach_bus_ops(struct mmc_host *host)
 975 {
 976         const struct mmc_bus_ops *bus_ops;
 977
 978         if (!mmc_card_is_removable(host))
 979                 bus_ops = &mmc_ops_unsafe;
 980         else
 981                 bus_ops = &mmc_ops;
 982         mmc_attach_bus(host, bus_ops);
 983 }
 984
 985 /*
 986  * Starting point for MMC card init.
 987  */
 988 int mmc_attach_mmc(struct mmc_host *host)
 989 {
 990         int err;
 991         u32 ocr;
 992
 993         BUG_ON(!host);
 994         WARN_ON(!host->claimed);
 995
 996         err = mmc_send_op_cond(host, 0, &ocr);
 997         if (err)
 998                 return err;
 999
1000         mmc_attach_bus_ops(host);
1001         if (host->ocr_avail_mmc)
1002                 host->ocr_avail = host->ocr_avail_mmc;
1003
1004         /*
1005          * We need to get OCR a different way for SPI.
1006          */
1007         if (mmc_host_is_spi(host)) {
1008                 err = mmc_spi_read_ocr(host, 1, &ocr);
1009                 if (err)
1010                         goto err;
1011         }
1012
1013         /*
1014          * Sanity check the voltages that the card claims to
1015          * support.
1016          */
1017         if (ocr & 0x7F) {
1018                 printk(KERN_WARNING "%s: card claims to support voltages "
1019                        "below the defined range. These will be ignored.\n",
1020                        mmc_hostname(host));
1021                 ocr &= ~0x7F;
1022         }
1023
1024         host->ocr = mmc_select_voltage(host, ocr);
1025
1026         /*
1027          * Can we support the voltage of the card?
1028          */
1029         if (!host->ocr) {
1030                 err = -EINVAL;
1031                 goto err;
1032         }
1033
1034         /*
1035          * Detect and init the card.
1036          */
1037         err = mmc_init_card(host, host->ocr, NULL);
1038         if (err)
1039                 goto err;
1040
1041         mmc_release_host(host);
1042         err = mmc_add_card(host->card);
1043         mmc_claim_host(host);
1044         if (err)
1045                 goto remove_card;
1046
1047         return 0;
1048
1049 remove_card:
1050         mmc_release_host(host);
1051         mmc_remove_card(host->card);
1052         mmc_claim_host(host);
1053         host->card = NULL;
1054 err:
1055         mmc_detach_bus(host);
1056
1057         printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
1058                 mmc_hostname(host), err);
1059
1060         return err;
1061 }