drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/errno.h>
  27 #include <linux/hdreg.h>
  28 #include <linux/kdev_t.h>
  29 #include <linux/blkdev.h>
  30 #include <linux/mutex.h>
  31 #include <linux/scatterlist.h>
  32 #include <linux/string_helpers.h>
  33
  34 #include <linux/mmc/card.h>
  35 #include <linux/mmc/host.h>
  36 #include <linux/mmc/mmc.h>
  37 #include <linux/mmc/sd.h>
  38
  39 #include <asm/system.h>
  40 #include <asm/uaccess.h>
  41
  42 #include "queue.h"
  43
  44 MODULE_ALIAS("mmc:block");
  45
  46 /*
  47  * max 8 partitions per card
  48  */
  49 #define MMC_SHIFT       3
  50 #define MMC_NUM_MINORS  (256 >> MMC_SHIFT)
  51
  52 static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS);
  53
  54 /*
  55  * There is one mmc_blk_data per slot.
  56  */
  57 struct mmc_blk_data {
  58         spinlock_t      lock;
  59         struct gendisk  *disk;
  60         struct mmc_queue queue;
  61
  62         unsigned int    usage;
  63         unsigned int    read_only;
  64 };
  65
  66 static DEFINE_MUTEX(open_lock);
  67
  68 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
  69 {
  70         struct mmc_blk_data *md;
  71
  72         mutex_lock(&open_lock);
  73         md = disk->private_data;
  74         if (md && md->usage == 0)
  75                 md = NULL;
  76         if (md)
  77                 md->usage++;
  78         mutex_unlock(&open_lock);
  79
  80         return md;
  81 }
  82
  83 static void mmc_blk_put(struct mmc_blk_data *md)
  84 {
  85         mutex_lock(&open_lock);
  86         md->usage--;
  87         if (md->usage == 0) {
  88                 int devmaj = MAJOR(disk_devt(md->disk));
  89                 int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT;
  90
  91                 if (!devmaj)
  92                         devidx = md->disk->first_minor >> MMC_SHIFT;
  93
  94                 blk_cleanup_queue(md->queue.queue);
  95
  96                 __clear_bit(devidx, dev_use);
  97
  98                 put_disk(md->disk);
  99                 kfree(md);
 100         }
 101         mutex_unlock(&open_lock);
 102 }
 103
 104 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 105 {
 106         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 107         int ret = -ENXIO;
 108
 109         if (md) {
 110                 if (md->usage == 2)
 111                         check_disk_change(bdev);
 112                 ret = 0;
 113
 114                 if ((mode & FMODE_WRITE) && md->read_only) {
 115                         mmc_blk_put(md);
 116                         ret = -EROFS;
 117                 }
 118         }
 119
 120         return ret;
 121 }
 122
 123 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
 124 {
 125         struct mmc_blk_data *md = disk->private_data;
 126
 127         mmc_blk_put(md);
 128         return 0;
 129 }
 130
 131 static int
 132 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 133 {
 134         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 135         geo->heads = 4;
 136         geo->sectors = 16;
 137         return 0;
 138 }
 139
 140 static const struct block_device_operations mmc_bdops = {
 141         .open                   = mmc_blk_open,
 142         .release                = mmc_blk_release,
 143         .getgeo                 = mmc_blk_getgeo,
 144         .owner                  = THIS_MODULE,
 145 };
 146
 147 struct mmc_blk_request {
 148         struct mmc_request      mrq;
 149         struct mmc_command      cmd;
 150         struct mmc_command      stop;
 151         struct mmc_data         data;
 152 };
 153
 154 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 155 {
 156         int err;
 157         u32 result;
 158         __be32 *blocks;
 159
 160         struct mmc_request mrq;
 161         struct mmc_command cmd;
 162         struct mmc_data data;
 163         unsigned int timeout_us;
 164
 165         struct scatterlist sg;
 166
 167         memset(&cmd, 0, sizeof(struct mmc_command));
 168
 169         cmd.opcode = MMC_APP_CMD;
 170         cmd.arg = card->rca << 16;
 171         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 172
 173         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 174         if (err)
 175                 return (u32)-1;
 176         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 177                 return (u32)-1;
 178
 179         memset(&cmd, 0, sizeof(struct mmc_command));
 180
 181         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 182         cmd.arg = 0;
 183         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 184
 185         memset(&data, 0, sizeof(struct mmc_data));
 186
 187         data.timeout_ns = card->csd.tacc_ns * 100;
 188         data.timeout_clks = card->csd.tacc_clks * 100;
 189
 190         timeout_us = data.timeout_ns / 1000;
 191         timeout_us += data.timeout_clks * 1000 /
 192                 (card->host->ios.clock / 1000);
 193
 194         if (timeout_us > 100000) {
 195                 data.timeout_ns = 100000000;
 196                 data.timeout_clks = 0;
 197         }
 198
 199         data.blksz = 4;
 200         data.blocks = 1;
 201         data.flags = MMC_DATA_READ;
 202         data.sg = &sg;
 203         data.sg_len = 1;
 204
 205         memset(&mrq, 0, sizeof(struct mmc_request));
 206
 207         mrq.cmd = &cmd;
 208         mrq.data = &data;
 209
 210         blocks = kmalloc(4, GFP_KERNEL);
 211         if (!blocks)
 212                 return (u32)-1;
 213
 214         sg_init_one(&sg, blocks, 4);
 215
 216         mmc_wait_for_req(card->host, &mrq);
 217
 218         result = ntohl(*blocks);
 219         kfree(blocks);
 220
 221         if (cmd.error || data.error)
 222                 result = (u32)-1;
 223
 224         return result;
 225 }
 226
 227 static u32 get_card_status(struct mmc_card *card, struct request *req)
 228 {
 229         struct mmc_command cmd;
 230         int err;
 231
 232         memset(&cmd, 0, sizeof(struct mmc_command));
 233         cmd.opcode = MMC_SEND_STATUS;
 234         if (!mmc_host_is_spi(card->host))
 235                 cmd.arg = card->rca << 16;
 236         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 237         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 238         if (err)
 239                 printk(KERN_ERR "%s: error %d sending status comand",
 240                        req->rq_disk->disk_name, err);
 241         return cmd.resp[0];
 242 }
 243
 244 static int
 245 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
 246 {
 247         struct mmc_command cmd;
 248         int err;
 249
 250         /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
 251         if (mmc_card_blockaddr(card))
 252                 return 0;
 253
 254         mmc_claim_host(card->host);
 255         cmd.opcode = MMC_SET_BLOCKLEN;
 256         cmd.arg = 512;
 257         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 258         err = mmc_wait_for_cmd(card->host, &cmd, 5);
 259         mmc_release_host(card->host);
 260
 261         if (err) {
 262                 printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
 263                         md->disk->disk_name, cmd.arg, err);
 264                 return -EINVAL;
 265         }
 266
 267         return 0;
 268 }
 269
 270
 271 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 272 {
 273         struct mmc_blk_data *md = mq->data;
 274         struct mmc_card *card = md->queue.card;
 275         struct mmc_blk_request brq;
 276         int ret = 1, disable_multi = 0;
 277
 278 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 279         if (mmc_bus_needs_resume(card->host)) {
 280                 mmc_resume_bus(card->host);
 281                 mmc_blk_set_blksize(md, card);
 282         }
 283 #endif
 284
 285         mmc_claim_host(card->host);
 286
 287         do {
 288                 struct mmc_command cmd;
 289                 u32 readcmd, writecmd, status = 0;
 290
 291                 memset(&brq, 0, sizeof(struct mmc_blk_request));
 292                 brq.mrq.cmd = &brq.cmd;
 293                 brq.mrq.data = &brq.data;
 294
 295                 brq.cmd.arg = blk_rq_pos(req);
 296                 if (!mmc_card_blockaddr(card))
 297                         brq.cmd.arg <<= 9;
 298                 brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 299                 brq.data.blksz = 512;
 300                 brq.stop.opcode = MMC_STOP_TRANSMISSION;
 301                 brq.stop.arg = 0;
 302                 brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 303                 brq.data.blocks = blk_rq_sectors(req);
 304
 305                 /*
 306                  * The block layer doesn't support all sector count
 307                  * restrictions, so we need to be prepared for too big
 308                  * requests.
 309                  */
 310                 if (brq.data.blocks > card->host->max_blk_count)
 311                         brq.data.blocks = card->host->max_blk_count;
 312
 313                 /*
 314                  * After a read error, we redo the request one sector at a time
 315                  * in order to accurately determine which sectors can be read
 316                  * successfully.
 317                  */
 318                 if (disable_multi && brq.data.blocks > 1)
 319                         brq.data.blocks = 1;
 320
 321                 if (brq.data.blocks > 1) {
 322                         /* SPI multiblock writes terminate using a special
 323                          * token, not a STOP_TRANSMISSION request.
 324                          */
 325                         if (!mmc_host_is_spi(card->host)
 326                                         || rq_data_dir(req) == READ)
 327                                 brq.mrq.stop = &brq.stop;
 328                         readcmd = MMC_READ_MULTIPLE_BLOCK;
 329                         writecmd = MMC_WRITE_MULTIPLE_BLOCK;
 330                 } else {
 331                         brq.mrq.stop = NULL;
 332                         readcmd = MMC_READ_SINGLE_BLOCK;
 333                         writecmd = MMC_WRITE_BLOCK;
 334                 }
 335
 336                 if (rq_data_dir(req) == READ) {
 337                         brq.cmd.opcode = readcmd;
 338                         brq.data.flags |= MMC_DATA_READ;
 339                 } else {
 340                         brq.cmd.opcode = writecmd;
 341                         brq.data.flags |= MMC_DATA_WRITE;
 342                 }
 343
 344                 mmc_set_data_timeout(&brq.data, card);
 345
 346                 brq.data.sg = mq->sg;
 347                 brq.data.sg_len = mmc_queue_map_sg(mq);
 348
 349                 /*
 350                  * Adjust the sg list so it is the same size as the
 351                  * request.
 352                  */
 353                 if (brq.data.blocks != blk_rq_sectors(req)) {
 354                         int i, data_size = brq.data.blocks << 9;
 355                         struct scatterlist *sg;
 356
 357                         for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
 358                                 data_size -= sg->length;
 359                                 if (data_size <= 0) {
 360                                         sg->length += data_size;
 361                                         i++;
 362                                         break;
 363                                 }
 364                         }
 365                         brq.data.sg_len = i;
 366                 }
 367
 368                 mmc_queue_bounce_pre(mq);
 369
 370                 mmc_wait_for_req(card->host, &brq.mrq);
 371
 372                 mmc_queue_bounce_post(mq);
 373
 374                 /*
 375                  * Check for errors here, but don't jump to cmd_err
 376                  * until later as we need to wait for the card to leave
 377                  * programming mode even when things go wrong.
 378                  */
 379                 if (brq.cmd.error || brq.data.error || brq.stop.error) {
 380                         if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
 381                                 /* Redo read one sector at a time */
 382                                 printk(KERN_WARNING "%s: retrying using single "
 383                                        "block read\n", req->rq_disk->disk_name);
 384                                 disable_multi = 1;
 385                                 continue;
 386                         }
 387                         status = get_card_status(card, req);
 388                 } else if (disable_multi == 1) {
 389                         disable_multi = 0;
 390                 }
 391
 392                 if (brq.cmd.error) {
 393                         printk(KERN_ERR "%s: error %d sending read/write "
 394                                "command, response %#x, card status %#x\n",
 395                                req->rq_disk->disk_name, brq.cmd.error,
 396                                brq.cmd.resp[0], status);
 397                 }
 398
 399                 if (brq.data.error) {
 400                         if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
 401                                 /* 'Stop' response contains card status */
 402                                 status = brq.mrq.stop->resp[0];
 403                         printk(KERN_ERR "%s: error %d transferring data,"
 404                                " sector %u, nr %u, card status %#x\n",
 405                                req->rq_disk->disk_name, brq.data.error,
 406                                (unsigned)blk_rq_pos(req),
 407                                (unsigned)blk_rq_sectors(req), status);
 408                 }
 409
 410                 if (brq.stop.error) {
 411                         printk(KERN_ERR "%s: error %d sending stop command, "
 412                                "response %#x, card status %#x\n",
 413                                req->rq_disk->disk_name, brq.stop.error,
 414                                brq.stop.resp[0], status);
 415                 }
 416
 417                 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
 418                         do {
 419                                 int err;
 420
 421                                 cmd.opcode = MMC_SEND_STATUS;
 422                                 cmd.arg = card->rca << 16;
 423                                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 424                                 err = mmc_wait_for_cmd(card->host, &cmd, 5);
 425                                 if (err) {
 426                                         printk(KERN_ERR "%s: error %d requesting status\n",
 427                                                req->rq_disk->disk_name, err);
 428                                         goto cmd_err;
 429                                 }
 430                                 /*
 431                                  * Some cards mishandle the status bits,
 432                                  * so make sure to check both the busy
 433                                  * indication and the card state.
 434                                  */
 435                         } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
 436                                 (R1_CURRENT_STATE(cmd.resp[0]) == 7));
 437
 438 #if 0
 439                         if (cmd.resp[0] & ~0x00000900)
 440                                 printk(KERN_ERR "%s: status = %08x\n",
 441                                        req->rq_disk->disk_name, cmd.resp[0]);
 442                         if (mmc_decode_status(cmd.resp))
 443                                 goto cmd_err;
 444 #endif
 445                 }
 446
 447                 if (brq.cmd.error || brq.stop.error || brq.data.error) {
 448                         if (rq_data_dir(req) == READ) {
 449                                 /*
 450                                  * After an error, we redo I/O one sector at a
 451                                  * time, so we only reach here after trying to
 452                                  * read a single sector.
 453                                  */
 454                                 spin_lock_irq(&md->lock);
 455                                 ret = __blk_end_request(req, -EIO, brq.data.blksz);
 456                                 spin_unlock_irq(&md->lock);
 457                                 continue;
 458                         }
 459                         goto cmd_err;
 460                 }
 461
 462                 /*
 463                  * A block was successfully transferred.
 464                  */
 465                 spin_lock_irq(&md->lock);
 466                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 467                 spin_unlock_irq(&md->lock);
 468         } while (ret);
 469
 470         mmc_release_host(card->host);
 471
 472         return 1;
 473
 474  cmd_err:
 475         /*
 476          * If this is an SD card and we're writing, we can first
 477          * mark the known good sectors as ok.
 478          *
 479          * If the card is not SD, we can still ok written sectors
 480          * as reported by the controller (which might be less than
 481          * the real number of written sectors, but never more).
 482          */
 483         if (mmc_card_sd(card)) {
 484                 u32 blocks;
 485
 486                 blocks = mmc_sd_num_wr_blocks(card);
 487                 if (blocks != (u32)-1) {
 488                         spin_lock_irq(&md->lock);
 489                         ret = __blk_end_request(req, 0, blocks << 9);
 490                         spin_unlock_irq(&md->lock);
 491                 }
 492         } else {
 493                 spin_lock_irq(&md->lock);
 494                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 495                 spin_unlock_irq(&md->lock);
 496         }
 497
 498         mmc_release_host(card->host);
 499
 500         spin_lock_irq(&md->lock);
 501         while (ret)
 502                 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
 503         spin_unlock_irq(&md->lock);
 504
 505         return 0;
 506 }
 507
 508
 509 static inline int mmc_blk_readonly(struct mmc_card *card)
 510 {
 511         return mmc_card_readonly(card) ||
 512                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
 513 }
 514
 515 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
 516 {
 517         struct mmc_blk_data *md;
 518         int devidx, ret;
 519
 520         devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
 521         if (devidx >= MMC_NUM_MINORS)
 522                 return ERR_PTR(-ENOSPC);
 523         __set_bit(devidx, dev_use);
 524
 525         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
 526         if (!md) {
 527                 ret = -ENOMEM;
 528                 goto out;
 529         }
 530
 531
 532         /*
 533          * Set the read-only status based on the supported commands
 534          * and the write protect switch.
 535          */
 536         md->read_only = mmc_blk_readonly(card);
 537
 538         md->disk = alloc_disk(1 << MMC_SHIFT);
 539         if (md->disk == NULL) {
 540                 ret = -ENOMEM;
 541                 goto err_kfree;
 542         }
 543
 544         spin_lock_init(&md->lock);
 545         md->usage = 1;
 546
 547         ret = mmc_init_queue(&md->queue, card, &md->lock);
 548         if (ret)
 549                 goto err_putdisk;
 550
 551         md->queue.issue_fn = mmc_blk_issue_rq;
 552         md->queue.data = md;
 553
 554         md->disk->major = MMC_BLOCK_MAJOR;
 555         md->disk->first_minor = devidx << MMC_SHIFT;
 556         md->disk->fops = &mmc_bdops;
 557         md->disk->private_data = md;
 558         md->disk->queue = md->queue.queue;
 559         md->disk->driverfs_dev = &card->dev;
 560
 561         /*
 562          * As discussed on lkml, GENHD_FL_REMOVABLE should:
 563          *
 564          * - be set for removable media with permanent block devices
 565          * - be unset for removable block devices with permanent media
 566          *
 567          * Since MMC block devices clearly fall under the second
 568          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
 569          * should use the block device creation/destruction hotplug
 570          * messages to tell when the card is present.
 571          */
 572
 573         sprintf(md->disk->disk_name, "mmcblk%d", devidx);
 574
 575         blk_queue_logical_block_size(md->queue.queue, 512);
 576
 577         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
 578                 /*
 579                  * The EXT_CSD sector count is in number or 512 byte
 580                  * sectors.
 581                  */
 582                 set_capacity(md->disk, card->ext_csd.sectors);
 583         } else {
 584                 /*
 585                  * The CSD capacity field is in units of read_blkbits.
 586                  * set_capacity takes units of 512 bytes.
 587                  */
 588                 set_capacity(md->disk,
 589                         card->csd.capacity << (card->csd.read_blkbits - 9));
 590         }
 591         return md;
 592
 593  err_putdisk:
 594         put_disk(md->disk);
 595  err_kfree:
 596         kfree(md);
 597  out:
 598         return ERR_PTR(ret);
 599 }
 600
 601 static int mmc_blk_probe(struct mmc_card *card)
 602 {
 603         struct mmc_blk_data *md;
 604         int err;
 605
 606         char cap_str[10];
 607
 608         /*
 609          * Check that the card supports the command class(es) we need.
 610          */
 611         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
 612                 return -ENODEV;
 613
 614         md = mmc_blk_alloc(card);
 615         if (IS_ERR(md))
 616                 return PTR_ERR(md);
 617
 618         err = mmc_blk_set_blksize(md, card);
 619         if (err)
 620                 goto out;
 621
 622         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
 623                         cap_str, sizeof(cap_str));
 624         printk(KERN_INFO "%s: %s %s %s %s\n",
 625                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
 626                 cap_str, md->read_only ? "(ro)" : "");
 627
 628         mmc_set_drvdata(card, md);
 629 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 630         mmc_set_bus_resume_policy(card->host, 1);
 631 #endif
 632         add_disk(md->disk);
 633         return 0;
 634
 635  out:
 636         mmc_cleanup_queue(&md->queue);
 637         mmc_blk_put(md);
 638
 639         return err;
 640 }
 641
 642 static void mmc_blk_remove(struct mmc_card *card)
 643 {
 644         struct mmc_blk_data *md = mmc_get_drvdata(card);
 645
 646         if (md) {
 647                 /* Stop new requests from getting into the queue */
 648                 del_gendisk(md->disk);
 649
 650                 /* Then flush out any already in there */
 651                 mmc_cleanup_queue(&md->queue);
 652
 653                 mmc_blk_put(md);
 654         }
 655         mmc_set_drvdata(card, NULL);
 656 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 657         mmc_set_bus_resume_policy(card->host, 0);
 658 #endif
 659 }
 660
 661 #ifdef CONFIG_PM
 662 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
 663 {
 664         struct mmc_blk_data *md = mmc_get_drvdata(card);
 665
 666         if (md) {
 667                 mmc_queue_suspend(&md->queue);
 668         }
 669         return 0;
 670 }
 671
 672 static int mmc_blk_resume(struct mmc_card *card)
 673 {
 674         struct mmc_blk_data *md = mmc_get_drvdata(card);
 675
 676         if (md) {
 677 #ifndef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 678                 mmc_blk_set_blksize(md, card);
 679 #endif
 680                 mmc_queue_resume(&md->queue);
 681         }
 682         return 0;
 683 }
 684 #else
 685 #define mmc_blk_suspend NULL
 686 #define mmc_blk_resume  NULL
 687 #endif
 688
 689 static struct mmc_driver mmc_driver = {
 690         .drv            = {
 691                 .name   = "mmcblk",
 692         },
 693         .probe          = mmc_blk_probe,
 694         .remove         = mmc_blk_remove,
 695         .suspend        = mmc_blk_suspend,
 696         .resume         = mmc_blk_resume,
 697 };
 698
 699 static int __init mmc_blk_init(void)
 700 {
 701         int res;
 702
 703         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
 704         if (res)
 705                 goto out;
 706
 707         res = mmc_register_driver(&mmc_driver);
 708         if (res)
 709                 goto out2;
 710
 711         return 0;
 712  out2:
 713         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 714  out:
 715         return res;
 716 }
 717
 718 static void __exit mmc_blk_exit(void)
 719 {
 720         mmc_unregister_driver(&mmc_driver);
 721         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 722 }
 723
 724 module_init(mmc_blk_init);
 725 module_exit(mmc_blk_exit);
 726
 727 MODULE_LICENSE("GPL");
 728 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
 729