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         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 251         if (card->csd.structure == 3) {
 252                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 253                         printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
 254                                 "version %d\n", mmc_hostname(card->host),
 255                                         card->ext_csd.raw_ext_csd_structure);
 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 > 6) {
 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         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 270         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 271         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 272         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 273         if (card->ext_csd.rev >= 2) {
 274                 card->ext_csd.sectors =
 275                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 276                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 277                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 278                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 279
 280                 /* Cards with density > 2GiB are sector addressed */
 281                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 282                         mmc_card_set_blockaddr(card);
 283         }
 284         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 285         switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
 286         case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
 287              EXT_CSD_CARD_TYPE_26:
 288                 card->ext_csd.hs_max_dtr = 52000000;
 289                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
 290                 break;
 291         case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
 292              EXT_CSD_CARD_TYPE_26:
 293                 card->ext_csd.hs_max_dtr = 52000000;
 294                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
 295                 break;
 296         case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
 297              EXT_CSD_CARD_TYPE_26:
 298                 card->ext_csd.hs_max_dtr = 52000000;
 299                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
 300                 break;
 301         case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
 302                 card->ext_csd.hs_max_dtr = 52000000;
 303                 break;
 304         case EXT_CSD_CARD_TYPE_26:
 305                 card->ext_csd.hs_max_dtr = 26000000;
 306                 break;
 307         default:
 308                 /* MMC v4 spec says this cannot happen */
 309                 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
 310                         "support any high-speed modes.\n",
 311                         mmc_hostname(card->host));
 312         }
 313
 314         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 315         card->ext_csd.raw_erase_timeout_mult =
 316                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 317         card->ext_csd.raw_hc_erase_grp_size =
 318                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 319         if (card->ext_csd.rev >= 3) {
 320                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 321                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 322
 323                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 324                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 325
 326                 /* Sleep / awake timeout in 100ns units */
 327                 if (sa_shift > 0 && sa_shift <= 0x17)
 328                         card->ext_csd.sa_timeout =
 329                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 330                 card->ext_csd.erase_group_def =
 331                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 332                 card->ext_csd.hc_erase_timeout = 300 *
 333                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 334                 card->ext_csd.hc_erase_size =
 335                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 336
 337                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 338
 339                 /*
 340                  * There are two boot regions of equal size, defined in
 341                  * multiples of 128K.
 342                  */
 343                 card->ext_csd.boot_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 344         }
 345
 346         card->ext_csd.raw_hc_erase_gap_size =
 347                 ext_csd[EXT_CSD_PARTITION_ATTRIBUTE];
 348         card->ext_csd.raw_sec_trim_mult =
 349                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 350         card->ext_csd.raw_sec_erase_mult =
 351                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 352         card->ext_csd.raw_sec_feature_support =
 353                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 354         card->ext_csd.raw_trim_mult =
 355                 ext_csd[EXT_CSD_TRIM_MULT];
 356         if (card->ext_csd.rev >= 4) {
 357                 /*
 358                  * Enhanced area feature support -- check whether the eMMC
 359                  * card has the Enhanced area enabled.  If so, export enhanced
 360                  * area offset and size to user by adding sysfs interface.
 361                  */
 362                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 363                     (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 364                         u8 hc_erase_grp_sz =
 365                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 366                         u8 hc_wp_grp_sz =
 367                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 368
 369                         card->ext_csd.enhanced_area_en = 1;
 370                         /*
 371                          * calculate the enhanced data area offset, in bytes
 372                          */
 373                         card->ext_csd.enhanced_area_offset =
 374                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
 375                                 (ext_csd[137] << 8) + ext_csd[136];
 376                         if (mmc_card_blockaddr(card))
 377                                 card->ext_csd.enhanced_area_offset <<= 9;
 378                         /*
 379                          * calculate the enhanced data area size, in kilobytes
 380                          */
 381                         card->ext_csd.enhanced_area_size =
 382                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 383                                 ext_csd[140];
 384                         card->ext_csd.enhanced_area_size *=
 385                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 386                         card->ext_csd.enhanced_area_size <<= 9;
 387                 } else {
 388                         /*
 389                          * If the enhanced area is not enabled, disable these
 390                          * device attributes.
 391                          */
 392                         card->ext_csd.enhanced_area_offset = -EINVAL;
 393                         card->ext_csd.enhanced_area_size = -EINVAL;
 394                 }
 395                 card->ext_csd.sec_trim_mult =
 396                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 397                 card->ext_csd.sec_erase_mult =
 398                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 399                 card->ext_csd.sec_feature_support =
 400                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 401                 card->ext_csd.trim_timeout = 300 *
 402                         ext_csd[EXT_CSD_TRIM_MULT];
 403         }
 404
 405         if (card->ext_csd.rev >= 5)
 406                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 407
 408         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 409                 card->erased_byte = 0xFF;
 410         else
 411                 card->erased_byte = 0x0;
 412
 413 out:
 414         return err;
 415 }
 416
 417 static inline void mmc_free_ext_csd(u8 *ext_csd)
 418 {
 419         kfree(ext_csd);
 420 }
 421
 422
 423 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 424 {
 425         u8 *bw_ext_csd;
 426         int err;
 427
 428         if (bus_width == MMC_BUS_WIDTH_1)
 429                 return 0;
 430
 431         err = mmc_get_ext_csd(card, &bw_ext_csd);
 432
 433         if (err || bw_ext_csd == NULL) {
 434                 if (bus_width != MMC_BUS_WIDTH_1)
 435                         err = -EINVAL;
 436                 goto out;
 437         }
 438
 439         if (bus_width == MMC_BUS_WIDTH_1)
 440                 goto out;
 441
 442         /* only compare read only fields */
 443         err = (!(card->ext_csd.raw_partition_support ==
 444                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 445                 (card->ext_csd.raw_erased_mem_count ==
 446                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 447                 (card->ext_csd.rev ==
 448                         bw_ext_csd[EXT_CSD_REV]) &&
 449                 (card->ext_csd.raw_ext_csd_structure ==
 450                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 451                 (card->ext_csd.raw_card_type ==
 452                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 453                 (card->ext_csd.raw_s_a_timeout ==
 454                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 455                 (card->ext_csd.raw_hc_erase_gap_size ==
 456                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 457                 (card->ext_csd.raw_erase_timeout_mult ==
 458                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 459                 (card->ext_csd.raw_hc_erase_grp_size ==
 460                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 461                 (card->ext_csd.raw_sec_trim_mult ==
 462                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 463                 (card->ext_csd.raw_sec_erase_mult ==
 464                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 465                 (card->ext_csd.raw_sec_feature_support ==
 466                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 467                 (card->ext_csd.raw_trim_mult ==
 468                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 469                 (card->ext_csd.raw_sectors[0] ==
 470                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 471                 (card->ext_csd.raw_sectors[1] ==
 472                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 473                 (card->ext_csd.raw_sectors[2] ==
 474                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 475                 (card->ext_csd.raw_sectors[3] ==
 476                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
 477         if (err)
 478                 err = -EINVAL;
 479
 480 out:
 481         mmc_free_ext_csd(bw_ext_csd);
 482         return err;
 483 }
 484
 485 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 486         card->raw_cid[2], card->raw_cid[3]);
 487 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 488         card->raw_csd[2], card->raw_csd[3]);
 489 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 490 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 491 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 492 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 493 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 494 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 495 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 496 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 497 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 498 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 499                 card->ext_csd.enhanced_area_offset);
 500 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 501
 502 static struct attribute *mmc_std_attrs[] = {
 503         &dev_attr_cid.attr,
 504         &dev_attr_csd.attr,
 505         &dev_attr_date.attr,
 506         &dev_attr_erase_size.attr,
 507         &dev_attr_preferred_erase_size.attr,
 508         &dev_attr_fwrev.attr,
 509         &dev_attr_hwrev.attr,
 510         &dev_attr_manfid.attr,
 511         &dev_attr_name.attr,
 512         &dev_attr_oemid.attr,
 513         &dev_attr_serial.attr,
 514         &dev_attr_enhanced_area_offset.attr,
 515         &dev_attr_enhanced_area_size.attr,
 516         NULL,
 517 };
 518
 519 static struct attribute_group mmc_std_attr_group = {
 520         .attrs = mmc_std_attrs,
 521 };
 522
 523 static const struct attribute_group *mmc_attr_groups[] = {
 524         &mmc_std_attr_group,
 525         NULL,
 526 };
 527
 528 static struct device_type mmc_type = {
 529         .groups = mmc_attr_groups,
 530 };
 531
 532 /*
 533  * Handle the detection and initialisation of a card.
 534  *
 535  * In the case of a resume, "oldcard" will contain the card
 536  * we're trying to reinitialise.
 537  */
 538 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 539         struct mmc_card *oldcard)
 540 {
 541         struct mmc_card *card;
 542         int err, ddr = 0;
 543         u32 cid[4];
 544         unsigned int max_dtr;
 545         u32 rocr;
 546         u8 *ext_csd = NULL;
 547
 548         BUG_ON(!host);
 549         WARN_ON(!host->claimed);
 550
 551         /* Set correct bus mode for MMC before attempting init */
 552         if (!mmc_host_is_spi(host))
 553                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 554
 555         /*
 556          * Since we're changing the OCR value, we seem to
 557          * need to tell some cards to go back to the idle
 558          * state.  We wait 1ms to give cards time to
 559          * respond.
 560          * mmc_go_idle is needed for eMMC that are asleep
 561          */
 562         mmc_go_idle(host);
 563
 564         /* The extra bit indicates that we support high capacity */
 565         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 566         if (err)
 567                 goto err;
 568
 569         /*
 570          * For SPI, enable CRC as appropriate.
 571          */
 572         if (mmc_host_is_spi(host)) {
 573                 err = mmc_spi_set_crc(host, use_spi_crc);
 574                 if (err)
 575                         goto err;
 576         }
 577
 578         /*
 579          * Fetch CID from card.
 580          */
 581         if (mmc_host_is_spi(host))
 582                 err = mmc_send_cid(host, cid);
 583         else
 584                 err = mmc_all_send_cid(host, cid);
 585         if (err)
 586                 goto err;
 587
 588         if (oldcard) {
 589                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 590                         err = -ENOENT;
 591                         goto err;
 592                 }
 593
 594                 card = oldcard;
 595         } else {
 596                 /*
 597                  * Allocate card structure.
 598                  */
 599                 card = mmc_alloc_card(host, &mmc_type);
 600                 if (IS_ERR(card)) {
 601                         err = PTR_ERR(card);
 602                         goto err;
 603                 }
 604
 605                 card->type = MMC_TYPE_MMC;
 606                 card->rca = 1;
 607                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 608         }
 609
 610         /*
 611          * For native busses:  set card RCA and quit open drain mode.
 612          */
 613         if (!mmc_host_is_spi(host)) {
 614                 err = mmc_set_relative_addr(card);
 615                 if (err)
 616                         goto free_card;
 617
 618                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 619         }
 620
 621         if (!oldcard) {
 622                 /*
 623                  * Fetch CSD from card.
 624                  */
 625                 err = mmc_send_csd(card, card->raw_csd);
 626                 if (err)
 627                         goto free_card;
 628
 629                 err = mmc_decode_csd(card);
 630                 if (err)
 631                         goto free_card;
 632                 err = mmc_decode_cid(card);
 633                 if (err)
 634                         goto free_card;
 635         }
 636
 637         /*
 638          * Select card, as all following commands rely on that.
 639          */
 640         if (!mmc_host_is_spi(host)) {
 641                 err = mmc_select_card(card);
 642                 if (err)
 643                         goto free_card;
 644         }
 645
 646         if (!oldcard) {
 647                 /*
 648                  * Fetch and process extended CSD.
 649                  */
 650
 651                 err = mmc_get_ext_csd(card, &ext_csd);
 652                 if (err)
 653                         goto free_card;
 654                 err = mmc_read_ext_csd(card, ext_csd);
 655                 if (err)
 656                         goto free_card;
 657
 658                 /* If doing byte addressing, check if required to do sector
 659                  * addressing.  Handle the case of <2GB cards needing sector
 660                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 661                  * ocr register has bit 30 set for sector addressing.
 662                  */
 663                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 664                         mmc_card_set_blockaddr(card);
 665
 666                 /* Erase size depends on CSD and Extended CSD */
 667                 mmc_set_erase_size(card);
 668         }
 669
 670         /*
 671          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 672          * bit.  This bit will be lost every time after a reset or power off.
 673          */
 674         if (card->ext_csd.enhanced_area_en) {
 675                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 676                                  EXT_CSD_ERASE_GROUP_DEF, 1, 0);
 677
 678                 if (err && err != -EBADMSG)
 679                         goto free_card;
 680
 681                 if (err) {
 682                         err = 0;
 683                         /*
 684                          * Just disable enhanced area off & sz
 685                          * will try to enable ERASE_GROUP_DEF
 686                          * during next time reinit
 687                          */
 688                         card->ext_csd.enhanced_area_offset = -EINVAL;
 689                         card->ext_csd.enhanced_area_size = -EINVAL;
 690                 } else {
 691                         card->ext_csd.erase_group_def = 1;
 692                         /*
 693                          * enable ERASE_GRP_DEF successfully.
 694                          * This will affect the erase size, so
 695                          * here need to reset erase size
 696                          */
 697                         mmc_set_erase_size(card);
 698                 }
 699         }
 700
 701         /*
 702          * Ensure eMMC user default partition is enabled
 703          */
 704         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
 705                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 706                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
 707                                  card->ext_csd.part_config,
 708                                  card->ext_csd.part_time);
 709                 if (err && err != -EBADMSG)
 710                         goto free_card;
 711         }
 712
 713         /*
 714          * Activate high speed (if supported)
 715          */
 716         if ((card->ext_csd.hs_max_dtr != 0) &&
 717                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
 718                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 719                                  EXT_CSD_HS_TIMING, 1, 0);
 720                 if (err && err != -EBADMSG)
 721                         goto free_card;
 722
 723                 if (err) {
 724                         printk(KERN_WARNING "%s: switch to highspeed failed\n",
 725                                mmc_hostname(card->host));
 726                         err = 0;
 727                 } else {
 728                         mmc_card_set_highspeed(card);
 729                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
 730                 }
 731         }
 732
 733         /*
 734          * Compute bus speed.
 735          */
 736         max_dtr = (unsigned int)-1;
 737
 738         if (mmc_card_highspeed(card)) {
 739                 if (max_dtr > card->ext_csd.hs_max_dtr)
 740                         max_dtr = card->ext_csd.hs_max_dtr;
 741         } else if (max_dtr > card->csd.max_dtr) {
 742                 max_dtr = card->csd.max_dtr;
 743         }
 744
 745         mmc_set_clock(host, max_dtr);
 746
 747         /*
 748          * Indicate DDR mode (if supported).
 749          */
 750         if (mmc_card_highspeed(card)) {
 751                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
 752                         && ((host->caps & (MMC_CAP_1_8V_DDR |
 753                              MMC_CAP_UHS_DDR50))
 754                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
 755                                 ddr = MMC_1_8V_DDR_MODE;
 756                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
 757                         && ((host->caps & (MMC_CAP_1_2V_DDR |
 758                              MMC_CAP_UHS_DDR50))
 759                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
 760                                 ddr = MMC_1_2V_DDR_MODE;
 761         }
 762
 763         /*
 764          * Activate wide bus and DDR (if supported).
 765          */
 766         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
 767             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
 768                 static unsigned ext_csd_bits[][2] = {
 769                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
 770                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
 771                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
 772                 };
 773                 static unsigned bus_widths[] = {
 774                         MMC_BUS_WIDTH_8,
 775                         MMC_BUS_WIDTH_4,
 776                         MMC_BUS_WIDTH_1
 777                 };
 778                 unsigned idx, bus_width = 0;
 779
 780                 if (host->caps & MMC_CAP_8_BIT_DATA)
 781                         idx = 0;
 782                 else
 783                         idx = 1;
 784                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 785                         bus_width = bus_widths[idx];
 786                         if (bus_width == MMC_BUS_WIDTH_1)
 787                                 ddr = 0; /* no DDR for 1-bit width */
 788                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 789                                          EXT_CSD_BUS_WIDTH,
 790                                          ext_csd_bits[idx][0],
 791                                          0);
 792                         if (!err) {
 793                                 mmc_set_bus_width(card->host, bus_width);
 794
 795                                 /*
 796                                  * If controller can't handle bus width test,
 797                                  * compare ext_csd previously read in 1 bit mode
 798                                  * against ext_csd at new bus width
 799                                  */
 800                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 801                                         err = mmc_compare_ext_csds(card,
 802                                                 bus_width);
 803                                 else
 804                                         err = mmc_bus_test(card, bus_width);
 805                                 if (!err)
 806                                         break;
 807                         }
 808                 }
 809
 810                 if (!err && ddr) {
 811                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 812                                          EXT_CSD_BUS_WIDTH,
 813                                          ext_csd_bits[idx][1],
 814                                          0);
 815                 }
 816                 if (err) {
 817                         printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
 818                                 "failed\n", mmc_hostname(card->host),
 819                                 1 << bus_width, ddr);
 820                         goto free_card;
 821                 } else if (ddr) {
 822                         /*
 823                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
 824                          * signaling.
 825                          *
 826                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
 827                          *
 828                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
 829                          * in the JEDEC spec for DDR.
 830                          *
 831                          * Do not force change in vccq since we are obviously
 832                          * working and no change to vccq is needed.
 833                          *
 834                          * WARNING: eMMC rules are NOT the same as SD DDR
 835                          */
 836                         if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
 837                                 err = mmc_set_signal_voltage(host,
 838                                         MMC_SIGNAL_VOLTAGE_120, 0);
 839                                 if (err)
 840                                         goto err;
 841                         }
 842                         mmc_card_set_ddr_mode(card);
 843                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
 844                         mmc_set_bus_width(card->host, bus_width);
 845                 }
 846         }
 847
 848         if (!oldcard)
 849                 host->card = card;
 850
 851         mmc_free_ext_csd(ext_csd);
 852         return 0;
 853
 854 free_card:
 855         if (!oldcard)
 856                 mmc_remove_card(card);
 857 err:
 858         mmc_free_ext_csd(ext_csd);
 859
 860         return err;
 861 }
 862
 863 /*
 864  * Host is being removed. Free up the current card.
 865  */
 866 static void mmc_remove(struct mmc_host *host)
 867 {
 868         BUG_ON(!host);
 869         BUG_ON(!host->card);
 870
 871         mmc_remove_card(host->card);
 872         host->card = NULL;
 873 }
 874
 875 /*
 876  * Card detection callback from host.
 877  */
 878 static void mmc_detect(struct mmc_host *host)
 879 {
 880         int err;
 881
 882         BUG_ON(!host);
 883         BUG_ON(!host->card);
 884
 885         mmc_claim_host(host);
 886
 887         /*
 888          * Just check if our card has been removed.
 889          */
 890         err = mmc_send_status(host->card, NULL);
 891
 892         mmc_release_host(host);
 893
 894         if (err) {
 895                 mmc_remove(host);
 896
 897                 mmc_claim_host(host);
 898                 mmc_detach_bus(host);
 899                 mmc_power_off(host);
 900                 mmc_release_host(host);
 901         }
 902 }
 903
 904 /*
 905  * Suspend callback from host.
 906  */
 907 static int mmc_suspend(struct mmc_host *host)
 908 {
 909         int err = 0;
 910
 911         BUG_ON(!host);
 912         BUG_ON(!host->card);
 913
 914         mmc_claim_host(host);
 915         if (mmc_card_can_sleep(host))
 916                 err = mmc_card_sleep(host);
 917         else if (!mmc_host_is_spi(host))
 918                 mmc_deselect_cards(host);
 919         host->card->state &= ~MMC_STATE_HIGHSPEED;
 920         mmc_release_host(host);
 921
 922         return err;
 923 }
 924
 925 /*
 926  * Resume callback from host.
 927  *
 928  * This function tries to determine if the same card is still present
 929  * and, if so, restore all state to it.
 930  */
 931 static int mmc_resume(struct mmc_host *host)
 932 {
 933         int err;
 934
 935         BUG_ON(!host);
 936         BUG_ON(!host->card);
 937
 938         mmc_claim_host(host);
 939         err = mmc_init_card(host, host->ocr, host->card);
 940         mmc_release_host(host);
 941
 942         return err;
 943 }
 944
 945 static int mmc_power_restore(struct mmc_host *host)
 946 {
 947         int ret;
 948
 949         host->card->state &= ~MMC_STATE_HIGHSPEED;
 950         mmc_claim_host(host);
 951         ret = mmc_init_card(host, host->ocr, host->card);
 952         mmc_release_host(host);
 953
 954         return ret;
 955 }
 956
 957 static int mmc_sleep(struct mmc_host *host)
 958 {
 959         struct mmc_card *card = host->card;
 960         int err = -ENOSYS;
 961
 962         if (card && card->ext_csd.rev >= 3) {
 963                 err = mmc_card_sleepawake(host, 1);
 964                 if (err < 0)
 965                         pr_debug("%s: Error %d while putting card into sleep",
 966                                  mmc_hostname(host), err);
 967         }
 968
 969         return err;
 970 }
 971
 972 static int mmc_awake(struct mmc_host *host)
 973 {
 974         struct mmc_card *card = host->card;
 975         int err = -ENOSYS;
 976
 977         if (card && card->ext_csd.rev >= 3) {
 978                 err = mmc_card_sleepawake(host, 0);
 979                 if (err < 0)
 980                         pr_debug("%s: Error %d while awaking sleeping card",
 981                                  mmc_hostname(host), err);
 982         }
 983
 984         return err;
 985 }
 986
 987 static const struct mmc_bus_ops mmc_ops = {
 988         .awake = mmc_awake,
 989         .sleep = mmc_sleep,
 990         .remove = mmc_remove,
 991         .detect = mmc_detect,
 992         .suspend = NULL,
 993         .resume = NULL,
 994         .power_restore = mmc_power_restore,
 995 };
 996
 997 static const struct mmc_bus_ops mmc_ops_unsafe = {
 998         .awake = mmc_awake,
 999         .sleep = mmc_sleep,
1000         .remove = mmc_remove,
1001         .detect = mmc_detect,
1002         .suspend = mmc_suspend,
1003         .resume = mmc_resume,
1004         .power_restore = mmc_power_restore,
1005 };
1006
1007 static void mmc_attach_bus_ops(struct mmc_host *host)
1008 {
1009         const struct mmc_bus_ops *bus_ops;
1010
1011         if (!mmc_card_is_removable(host))
1012                 bus_ops = &mmc_ops_unsafe;
1013         else
1014                 bus_ops = &mmc_ops;
1015         mmc_attach_bus(host, bus_ops);
1016 }
1017
1018 /*
1019  * Starting point for MMC card init.
1020  */
1021 int mmc_attach_mmc(struct mmc_host *host)
1022 {
1023         int err;
1024         u32 ocr;
1025
1026         BUG_ON(!host);
1027         WARN_ON(!host->claimed);
1028
1029         /* Set correct bus mode for MMC before attempting attach */
1030         if (!mmc_host_is_spi(host))
1031                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1032
1033         err = mmc_send_op_cond(host, 0, &ocr);
1034         if (err)
1035                 return err;
1036
1037         mmc_attach_bus_ops(host);
1038         if (host->ocr_avail_mmc)
1039                 host->ocr_avail = host->ocr_avail_mmc;
1040
1041         /*
1042          * We need to get OCR a different way for SPI.
1043          */
1044         if (mmc_host_is_spi(host)) {
1045                 err = mmc_spi_read_ocr(host, 1, &ocr);
1046                 if (err)
1047                         goto err;
1048         }
1049
1050         /*
1051          * Sanity check the voltages that the card claims to
1052          * support.
1053          */
1054         if (ocr & 0x7F) {
1055                 printk(KERN_WARNING "%s: card claims to support voltages "
1056                        "below the defined range. These will be ignored.\n",
1057                        mmc_hostname(host));
1058                 ocr &= ~0x7F;
1059         }
1060
1061         host->ocr = mmc_select_voltage(host, ocr);
1062
1063         /*
1064          * Can we support the voltage of the card?
1065          */
1066         if (!host->ocr) {
1067                 err = -EINVAL;
1068                 goto err;
1069         }
1070
1071         /*
1072          * Detect and init the card.
1073          */
1074         err = mmc_init_card(host, host->ocr, NULL);
1075         if (err)
1076                 goto err;
1077
1078         mmc_release_host(host);
1079         err = mmc_add_card(host->card);
1080         mmc_claim_host(host);
1081         if (err)
1082                 goto remove_card;
1083
1084         return 0;
1085
1086 remove_card:
1087         mmc_release_host(host);
1088         mmc_remove_card(host->card);
1089         mmc_claim_host(host);
1090         host->card = NULL;
1091 err:
1092         mmc_detach_bus(host);
1093
1094         printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
1095                 mmc_hostname(host), err);
1096
1097         return err;
1098 }