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
  24 static const unsigned int tran_exp[] = {
  25         10000,          100000,         1000000,        10000000,
  26         0,              0,              0,              0
  27 };
  28
  29 static const unsigned char tran_mant[] = {
  30         0,      10,     12,     13,     15,     20,     25,     30,
  31         35,     40,     45,     50,     55,     60,     70,     80,
  32 };
  33
  34 static const unsigned int tacc_exp[] = {
  35         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  36 };
  37
  38 static const unsigned int tacc_mant[] = {
  39         0,      10,     12,     13,     15,     20,     25,     30,
  40         35,     40,     45,     50,     55,     60,     70,     80,
  41 };
  42
  43 #define UNSTUFF_BITS(resp,start,size)                                   \
  44         ({                                                              \
  45                 const int __size = size;                                \
  46                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  47                 const int __off = 3 - ((start) / 32);                   \
  48                 const int __shft = (start) & 31;                        \
  49                 u32 __res;                                              \
  50                                                                         \
  51                 __res = resp[__off] >> __shft;                          \
  52                 if (__size + __shft > 32)                               \
  53                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  54                 __res & __mask;                                         \
  55         })
  56
  57 /*
  58  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  59  */
  60 static int mmc_decode_cid(struct mmc_card *card)
  61 {
  62         u32 *resp = card->raw_cid;
  63
  64         /*
  65          * The selection of the format here is based upon published
  66          * specs from sandisk and from what people have reported.
  67          */
  68         switch (card->csd.mmca_vsn) {
  69         case 0: /* MMC v1.0 - v1.2 */
  70         case 1: /* MMC v1.4 */
  71                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  72                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  73                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  74                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  75                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  76                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  77                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  78                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  79                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  80                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  81                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  82                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  83                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  84                 break;
  85
  86         case 2: /* MMC v2.0 - v2.2 */
  87         case 3: /* MMC v3.1 - v3.3 */
  88         case 4: /* MMC v4 */
  89                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
  90                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
  91                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  92                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  93                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  94                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  95                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  96                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  97                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
  98                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  99                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 100                 break;
 101
 102         default:
 103                 printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
 104                         mmc_hostname(card->host), card->csd.mmca_vsn);
 105                 return -EINVAL;
 106         }
 107
 108         return 0;
 109 }
 110
 111 static void mmc_set_erase_size(struct mmc_card *card)
 112 {
 113         if (card->ext_csd.erase_group_def & 1)
 114                 card->erase_size = card->ext_csd.hc_erase_size;
 115         else
 116                 card->erase_size = card->csd.erase_size;
 117
 118         mmc_init_erase(card);
 119 }
 120
 121 /*
 122  * Given a 128-bit response, decode to our card CSD structure.
 123  */
 124 static int mmc_decode_csd(struct mmc_card *card)
 125 {
 126         struct mmc_csd *csd = &card->csd;
 127         unsigned int e, m, a, b;
 128         u32 *resp = card->raw_csd;
 129
 130         /*
 131          * We only understand CSD structure v1.1 and v1.2.
 132          * v1.2 has extra information in bits 15, 11 and 10.
 133          * We also support eMMC v4.4 & v4.41.
 134          */
 135         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 136         if (csd->structure == 0) {
 137                 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
 138                         mmc_hostname(card->host), csd->structure);
 139                 return -EINVAL;
 140         }
 141
 142         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 143         m = UNSTUFF_BITS(resp, 115, 4);
 144         e = UNSTUFF_BITS(resp, 112, 3);
 145         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 146         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 147
 148         m = UNSTUFF_BITS(resp, 99, 4);
 149         e = UNSTUFF_BITS(resp, 96, 3);
 150         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 151         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 152
 153         e = UNSTUFF_BITS(resp, 47, 3);
 154         m = UNSTUFF_BITS(resp, 62, 12);
 155         csd->capacity     = (1 + m) << (e + 2);
 156
 157         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 158         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 159         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 160         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 161         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 162         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 163         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 164
 165         if (csd->write_blkbits >= 9) {
 166                 a = UNSTUFF_BITS(resp, 42, 5);
 167                 b = UNSTUFF_BITS(resp, 37, 5);
 168                 csd->erase_size = (a + 1) * (b + 1);
 169                 csd->erase_size <<= csd->write_blkbits - 9;
 170         }
 171
 172         return 0;
 173 }
 174
 175 /*
 176  * Read and decode extended CSD.
 177  */
 178 static int mmc_read_ext_csd(struct mmc_card *card)
 179 {
 180         int err;
 181         u8 *ext_csd;
 182
 183         BUG_ON(!card);
 184
 185         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 186                 return 0;
 187
 188         /*
 189          * As the ext_csd is so large and mostly unused, we don't store the
 190          * raw block in mmc_card.
 191          */
 192         ext_csd = kmalloc(512, GFP_KERNEL);
 193         if (!ext_csd) {
 194                 printk(KERN_ERR "%s: could not allocate a buffer to "
 195                         "receive the ext_csd.\n", mmc_hostname(card->host));
 196                 return -ENOMEM;
 197         }
 198
 199         err = mmc_send_ext_csd(card, ext_csd);
 200         if (err) {
 201                 /* If the host or the card can't do the switch,
 202                  * fail more gracefully. */
 203                 if ((err != -EINVAL)
 204                  && (err != -ENOSYS)
 205                  && (err != -EFAULT))
 206                         goto out;
 207
 208                 /*
 209                  * High capacity cards should have this "magic" size
 210                  * stored in their CSD.
 211                  */
 212                 if (card->csd.capacity == (4096 * 512)) {
 213                         printk(KERN_ERR "%s: unable to read EXT_CSD "
 214                                 "on a possible high capacity card. "
 215                                 "Card will be ignored.\n",
 216                                 mmc_hostname(card->host));
 217                 } else {
 218                         printk(KERN_WARNING "%s: unable to read "
 219                                 "EXT_CSD, performance might "
 220                                 "suffer.\n",
 221                                 mmc_hostname(card->host));
 222                         err = 0;
 223                 }
 224
 225                 goto out;
 226         }
 227
 228         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 229         if (card->csd.structure == 3) {
 230                 int ext_csd_struct = ext_csd[EXT_CSD_STRUCTURE];
 231                 if (ext_csd_struct > 2) {
 232                         printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
 233                                 "version %d\n", mmc_hostname(card->host),
 234                                         ext_csd_struct);
 235                         err = -EINVAL;
 236                         goto out;
 237                 }
 238         }
 239
 240         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 241         if (card->ext_csd.rev > 5) {
 242                 printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
 243                         mmc_hostname(card->host), card->ext_csd.rev);
 244                 err = -EINVAL;
 245                 goto out;
 246         }
 247
 248         if (card->ext_csd.rev >= 2) {
 249                 card->ext_csd.sectors =
 250                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 251                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 252                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 253                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 254
 255                 /* Cards with density > 2GiB are sector addressed */
 256                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 257                         mmc_card_set_blockaddr(card);
 258         }
 259
 260         switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
 261         case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
 262              EXT_CSD_CARD_TYPE_26:
 263                 card->ext_csd.hs_max_dtr = 52000000;
 264                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
 265                 break;
 266         case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
 267              EXT_CSD_CARD_TYPE_26:
 268                 card->ext_csd.hs_max_dtr = 52000000;
 269                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
 270                 break;
 271         case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
 272              EXT_CSD_CARD_TYPE_26:
 273                 card->ext_csd.hs_max_dtr = 52000000;
 274                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
 275                 break;
 276         case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
 277                 card->ext_csd.hs_max_dtr = 52000000;
 278                 break;
 279         case EXT_CSD_CARD_TYPE_26:
 280                 card->ext_csd.hs_max_dtr = 26000000;
 281                 break;
 282         default:
 283                 /* MMC v4 spec says this cannot happen */
 284                 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
 285                         "support any high-speed modes.\n",
 286                         mmc_hostname(card->host));
 287         }
 288
 289         if (card->ext_csd.rev >= 3) {
 290                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 291
 292                 /* Sleep / awake timeout in 100ns units */
 293                 if (sa_shift > 0 && sa_shift <= 0x17)
 294                         card->ext_csd.sa_timeout =
 295                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 296                 card->ext_csd.erase_group_def =
 297                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 298                 card->ext_csd.hc_erase_timeout = 300 *
 299                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 300                 card->ext_csd.hc_erase_size =
 301                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 302         }
 303
 304         if (card->ext_csd.rev >= 4) {
 305                 card->ext_csd.sec_trim_mult =
 306                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 307                 card->ext_csd.sec_erase_mult =
 308                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 309                 card->ext_csd.sec_feature_support =
 310                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 311                 card->ext_csd.trim_timeout = 300 *
 312                         ext_csd[EXT_CSD_TRIM_MULT];
 313         }
 314
 315         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 316                 card->erased_byte = 0xFF;
 317         else
 318                 card->erased_byte = 0x0;
 319
 320 out:
 321         kfree(ext_csd);
 322
 323         return err;
 324 }
 325
 326 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 327         card->raw_cid[2], card->raw_cid[3]);
 328 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 329         card->raw_csd[2], card->raw_csd[3]);
 330 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 331 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 332 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 333 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 334 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 335 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 336 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 337 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 338 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 339
 340 static struct attribute *mmc_std_attrs[] = {
 341         &dev_attr_cid.attr,
 342         &dev_attr_csd.attr,
 343         &dev_attr_date.attr,
 344         &dev_attr_erase_size.attr,
 345         &dev_attr_preferred_erase_size.attr,
 346         &dev_attr_fwrev.attr,
 347         &dev_attr_hwrev.attr,
 348         &dev_attr_manfid.attr,
 349         &dev_attr_name.attr,
 350         &dev_attr_oemid.attr,
 351         &dev_attr_serial.attr,
 352         NULL,
 353 };
 354
 355 static struct attribute_group mmc_std_attr_group = {
 356         .attrs = mmc_std_attrs,
 357 };
 358
 359 static const struct attribute_group *mmc_attr_groups[] = {
 360         &mmc_std_attr_group,
 361         NULL,
 362 };
 363
 364 static struct device_type mmc_type = {
 365         .groups = mmc_attr_groups,
 366 };
 367
 368 /*
 369  * Handle the detection and initialisation of a card.
 370  *
 371  * In the case of a resume, "oldcard" will contain the card
 372  * we're trying to reinitialise.
 373  */
 374 static int mmc_init_card(struct mmc_host *host, u32 ocr,
 375         struct mmc_card *oldcard)
 376 {
 377         struct mmc_card *card;
 378         int err, ddr = 0;
 379         u32 cid[4];
 380         unsigned int max_dtr;
 381
 382         BUG_ON(!host);
 383         WARN_ON(!host->claimed);
 384
 385         /*
 386          * Since we're changing the OCR value, we seem to
 387          * need to tell some cards to go back to the idle
 388          * state.  We wait 1ms to give cards time to
 389          * respond.
 390          */
 391         mmc_go_idle(host);
 392
 393         /* The extra bit indicates that we support high capacity */
 394         err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
 395         if (err)
 396                 goto err;
 397
 398         /*
 399          * For SPI, enable CRC as appropriate.
 400          */
 401         if (mmc_host_is_spi(host)) {
 402                 err = mmc_spi_set_crc(host, use_spi_crc);
 403                 if (err)
 404                         goto err;
 405         }
 406
 407         /*
 408          * Fetch CID from card.
 409          */
 410         if (mmc_host_is_spi(host))
 411                 err = mmc_send_cid(host, cid);
 412         else
 413                 err = mmc_all_send_cid(host, cid);
 414         if (err)
 415                 goto err;
 416
 417         if (oldcard) {
 418                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 419                         err = -ENOENT;
 420                         goto err;
 421                 }
 422
 423                 card = oldcard;
 424         } else {
 425                 /*
 426                  * Allocate card structure.
 427                  */
 428                 card = mmc_alloc_card(host, &mmc_type);
 429                 if (IS_ERR(card)) {
 430                         err = PTR_ERR(card);
 431                         goto err;
 432                 }
 433
 434                 card->type = MMC_TYPE_MMC;
 435                 card->rca = 1;
 436                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 437         }
 438
 439         /*
 440          * For native busses:  set card RCA and quit open drain mode.
 441          */
 442         if (!mmc_host_is_spi(host)) {
 443                 err = mmc_set_relative_addr(card);
 444                 if (err)
 445                         goto free_card;
 446
 447                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 448         }
 449
 450         if (!oldcard) {
 451                 /*
 452                  * Fetch CSD from card.
 453                  */
 454                 err = mmc_send_csd(card, card->raw_csd);
 455                 if (err)
 456                         goto free_card;
 457
 458                 err = mmc_decode_csd(card);
 459                 if (err)
 460                         goto free_card;
 461                 err = mmc_decode_cid(card);
 462                 if (err)
 463                         goto free_card;
 464         }
 465
 466         /*
 467          * Select card, as all following commands rely on that.
 468          */
 469         if (!mmc_host_is_spi(host)) {
 470                 err = mmc_select_card(card);
 471                 if (err)
 472                         goto free_card;
 473         }
 474
 475         if (!oldcard) {
 476                 /*
 477                  * Fetch and process extended CSD.
 478                  */
 479                 err = mmc_read_ext_csd(card);
 480                 if (err)
 481                         goto free_card;
 482                 /* Erase size depends on CSD and Extended CSD */
 483                 mmc_set_erase_size(card);
 484         }
 485
 486         /*
 487          * Activate high speed (if supported)
 488          */
 489         if ((card->ext_csd.hs_max_dtr != 0) &&
 490                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
 491                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 492                         EXT_CSD_HS_TIMING, 1);
 493                 if (err && err != -EBADMSG)
 494                         goto free_card;
 495
 496                 if (err) {
 497                         printk(KERN_WARNING "%s: switch to highspeed failed\n",
 498                                mmc_hostname(card->host));
 499                         err = 0;
 500                 } else {
 501                         mmc_card_set_highspeed(card);
 502                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
 503                 }
 504         }
 505
 506         /*
 507          * Compute bus speed.
 508          */
 509         max_dtr = (unsigned int)-1;
 510
 511         if (mmc_card_highspeed(card)) {
 512                 if (max_dtr > card->ext_csd.hs_max_dtr)
 513                         max_dtr = card->ext_csd.hs_max_dtr;
 514         } else if (max_dtr > card->csd.max_dtr) {
 515                 max_dtr = card->csd.max_dtr;
 516         }
 517
 518         mmc_set_clock(host, max_dtr);
 519
 520         /*
 521          * Indicate DDR mode (if supported).
 522          */
 523         if (mmc_card_highspeed(card)) {
 524                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
 525                         && (host->caps & (MMC_CAP_1_8V_DDR)))
 526                                 ddr = MMC_1_8V_DDR_MODE;
 527                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
 528                         && (host->caps & (MMC_CAP_1_2V_DDR)))
 529                                 ddr = MMC_1_2V_DDR_MODE;
 530         }
 531
 532         /*
 533          * Activate wide bus and DDR (if supported).
 534          */
 535         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
 536             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
 537                 static unsigned ext_csd_bits[][2] = {
 538                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
 539                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
 540                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
 541                 };
 542                 static unsigned bus_widths[] = {
 543                         MMC_BUS_WIDTH_8,
 544                         MMC_BUS_WIDTH_4,
 545                         MMC_BUS_WIDTH_1
 546                 };
 547                 unsigned idx, bus_width = 0;
 548
 549                 if (host->caps & MMC_CAP_8_BIT_DATA)
 550                         idx = 0;
 551                 else
 552                         idx = 1;
 553                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 554                         bus_width = bus_widths[idx];
 555                         if (bus_width == MMC_BUS_WIDTH_1)
 556                                 ddr = 0; /* no DDR for 1-bit width */
 557                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 558                                          EXT_CSD_BUS_WIDTH,
 559                                          ext_csd_bits[idx][0]);
 560                         if (!err) {
 561                                 mmc_set_bus_width_ddr(card->host,
 562                                                       bus_width, MMC_SDR_MODE);
 563                                 /*
 564                                  * If controller can't handle bus width test,
 565                                  * use the highest bus width to maintain
 566                                  * compatibility with previous MMC behavior.
 567                                  */
 568                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 569                                         break;
 570                                 err = mmc_bus_test(card, bus_width);
 571                                 if (!err)
 572                                         break;
 573                         }
 574                 }
 575
 576                 if (!err && ddr) {
 577                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 578                                         EXT_CSD_BUS_WIDTH,
 579                                         ext_csd_bits[idx][1]);
 580                 }
 581                 if (err) {
 582                         printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
 583                                 "failed\n", mmc_hostname(card->host),
 584                                 1 << bus_width, ddr);
 585                         goto free_card;
 586                 } else if (ddr) {
 587                         mmc_card_set_ddr_mode(card);
 588                         mmc_set_bus_width_ddr(card->host, bus_width, ddr);
 589                 }
 590         }
 591
 592         if (!oldcard)
 593                 host->card = card;
 594
 595         return 0;
 596
 597 free_card:
 598         if (!oldcard)
 599                 mmc_remove_card(card);
 600 err:
 601
 602         return err;
 603 }
 604
 605 /*
 606  * Host is being removed. Free up the current card.
 607  */
 608 static void mmc_remove(struct mmc_host *host)
 609 {
 610         BUG_ON(!host);
 611         BUG_ON(!host->card);
 612
 613         mmc_remove_card(host->card);
 614         host->card = NULL;
 615 }
 616
 617 /*
 618  * Card detection callback from host.
 619  */
 620 static void mmc_detect(struct mmc_host *host)
 621 {
 622         int err;
 623
 624         BUG_ON(!host);
 625         BUG_ON(!host->card);
 626
 627         mmc_claim_host(host);
 628
 629         /*
 630          * Just check if our card has been removed.
 631          */
 632         err = mmc_send_status(host->card, NULL);
 633
 634         mmc_release_host(host);
 635
 636         if (err) {
 637                 mmc_remove(host);
 638
 639                 mmc_claim_host(host);
 640                 mmc_detach_bus(host);
 641                 mmc_release_host(host);
 642         }
 643 }
 644
 645 /*
 646  * Suspend callback from host.
 647  */
 648 static int mmc_suspend(struct mmc_host *host)
 649 {
 650         BUG_ON(!host);
 651         BUG_ON(!host->card);
 652
 653         mmc_claim_host(host);
 654         if (!mmc_host_is_spi(host))
 655                 mmc_deselect_cards(host);
 656         host->card->state &= ~MMC_STATE_HIGHSPEED;
 657         mmc_release_host(host);
 658
 659         return 0;
 660 }
 661
 662 /*
 663  * Resume callback from host.
 664  *
 665  * This function tries to determine if the same card is still present
 666  * and, if so, restore all state to it.
 667  */
 668 static int mmc_resume(struct mmc_host *host)
 669 {
 670         int err;
 671
 672         BUG_ON(!host);
 673         BUG_ON(!host->card);
 674
 675         mmc_claim_host(host);
 676         err = mmc_init_card(host, host->ocr, host->card);
 677         mmc_release_host(host);
 678
 679         return err;
 680 }
 681
 682 static int mmc_power_restore(struct mmc_host *host)
 683 {
 684         int ret;
 685
 686         host->card->state &= ~MMC_STATE_HIGHSPEED;
 687         mmc_claim_host(host);
 688         ret = mmc_init_card(host, host->ocr, host->card);
 689         mmc_release_host(host);
 690
 691         return ret;
 692 }
 693
 694 static int mmc_sleep(struct mmc_host *host)
 695 {
 696         struct mmc_card *card = host->card;
 697         int err = -ENOSYS;
 698
 699         if (card && card->ext_csd.rev >= 3) {
 700                 err = mmc_card_sleepawake(host, 1);
 701                 if (err < 0)
 702                         pr_debug("%s: Error %d while putting card into sleep",
 703                                  mmc_hostname(host), err);
 704         }
 705
 706         return err;
 707 }
 708
 709 static int mmc_awake(struct mmc_host *host)
 710 {
 711         struct mmc_card *card = host->card;
 712         int err = -ENOSYS;
 713
 714         if (card && card->ext_csd.rev >= 3) {
 715                 err = mmc_card_sleepawake(host, 0);
 716                 if (err < 0)
 717                         pr_debug("%s: Error %d while awaking sleeping card",
 718                                  mmc_hostname(host), err);
 719         }
 720
 721         return err;
 722 }
 723
 724 static const struct mmc_bus_ops mmc_ops = {
 725         .awake = mmc_awake,
 726         .sleep = mmc_sleep,
 727         .remove = mmc_remove,
 728         .detect = mmc_detect,
 729         .suspend = NULL,
 730         .resume = NULL,
 731         .power_restore = mmc_power_restore,
 732 };
 733
 734 static const struct mmc_bus_ops mmc_ops_unsafe = {
 735         .awake = mmc_awake,
 736         .sleep = mmc_sleep,
 737         .remove = mmc_remove,
 738         .detect = mmc_detect,
 739         .suspend = mmc_suspend,
 740         .resume = mmc_resume,
 741         .power_restore = mmc_power_restore,
 742 };
 743
 744 static void mmc_attach_bus_ops(struct mmc_host *host)
 745 {
 746         const struct mmc_bus_ops *bus_ops;
 747
 748         if (!mmc_card_is_removable(host))
 749                 bus_ops = &mmc_ops_unsafe;
 750         else
 751                 bus_ops = &mmc_ops;
 752         mmc_attach_bus(host, bus_ops);
 753 }
 754
 755 /*
 756  * Starting point for MMC card init.
 757  */
 758 int mmc_attach_mmc(struct mmc_host *host)
 759 {
 760         int err;
 761         u32 ocr;
 762
 763         BUG_ON(!host);
 764         WARN_ON(!host->claimed);
 765
 766         err = mmc_send_op_cond(host, 0, &ocr);
 767         if (err)
 768                 return err;
 769
 770         mmc_attach_bus_ops(host);
 771         if (host->ocr_avail_mmc)
 772                 host->ocr_avail = host->ocr_avail_mmc;
 773
 774         /*
 775          * We need to get OCR a different way for SPI.
 776          */
 777         if (mmc_host_is_spi(host)) {
 778                 err = mmc_spi_read_ocr(host, 1, &ocr);
 779                 if (err)
 780                         goto err;
 781         }
 782
 783         /*
 784          * Sanity check the voltages that the card claims to
 785          * support.
 786          */
 787         if (ocr & 0x7F) {
 788                 printk(KERN_WARNING "%s: card claims to support voltages "
 789                        "below the defined range. These will be ignored.\n",
 790                        mmc_hostname(host));
 791                 ocr &= ~0x7F;
 792         }
 793
 794         host->ocr = mmc_select_voltage(host, ocr);
 795
 796         /*
 797          * Can we support the voltage of the card?
 798          */
 799         if (!host->ocr) {
 800                 err = -EINVAL;
 801                 goto err;
 802         }
 803
 804         /*
 805          * Detect and init the card.
 806          */
 807         err = mmc_init_card(host, host->ocr, NULL);
 808         if (err)
 809                 goto err;
 810
 811         mmc_release_host(host);
 812         err = mmc_add_card(host->card);
 813         mmc_claim_host(host);
 814         if (err)
 815                 goto remove_card;
 816
 817         return 0;
 818
 819 remove_card:
 820         mmc_release_host(host);
 821         mmc_remove_card(host->card);
 822         mmc_claim_host(host);
 823         host->card = NULL;
 824 err:
 825         mmc_detach_bus(host);
 826
 827         printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
 828                 mmc_hostname(host), err);
 829
 830         return err;
 831 }