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 0 //[xjh] not printk,save time
 239         if (err)
 240                 printk(KERN_ERR "%s: error %d sending status comand",
 241                        req->rq_disk->disk_name, err);
 242         #endif
 243         return cmd.resp[0];
 244 }
 245
 246 static int
 247 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
 248 {
 249         struct mmc_command cmd;
 250         int err;
 251
 252         /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
 253         if (mmc_card_blockaddr(card))
 254                 return 0;
 255
 256         mmc_claim_host(card->host);
 257         cmd.opcode = MMC_SET_BLOCKLEN;
 258         cmd.arg = 512;
 259         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 260         err = mmc_wait_for_cmd(card->host, &cmd, 5);
 261         mmc_release_host(card->host);
 262
 263         if (err) {
 264                 printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
 265                         md->disk->disk_name, cmd.arg, err);
 266                 return -EINVAL;
 267         }
 268
 269         return 0;
 270 }
 271
 272
 273 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 274 {
 275         struct mmc_blk_data *md = mq->data;
 276         struct mmc_card *card = md->queue.card;
 277         struct mmc_blk_request brq;
 278         int ret = 1, disable_multi = 0;
 279
 280 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 281         if (mmc_bus_needs_resume(card->host)) {
 282                 mmc_resume_bus(card->host);
 283                 mmc_blk_set_blksize(md, card);
 284         }
 285 #endif
 286
 287         mmc_claim_host(card->host);
 288
 289         do {
 290                 struct mmc_command cmd;
 291                 u32 readcmd, writecmd, status = 0;
 292
 293                 memset(&brq, 0, sizeof(struct mmc_blk_request));
 294                 brq.mrq.cmd = &brq.cmd;
 295                 brq.mrq.data = &brq.data;
 296
 297                 brq.cmd.arg = blk_rq_pos(req);
 298                 if (!mmc_card_blockaddr(card))
 299                         brq.cmd.arg <<= 9;
 300                 brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 301                 brq.data.blksz = 512;
 302                 brq.stop.opcode = MMC_STOP_TRANSMISSION;
 303                 brq.stop.arg = 0;
 304                 brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 305                 brq.data.blocks = blk_rq_sectors(req);
 306
 307                 /*
 308                  * The block layer doesn't support all sector count
 309                  * restrictions, so we need to be prepared for too big
 310                  * requests.
 311                  */
 312                 if (brq.data.blocks > card->host->max_blk_count)
 313                         brq.data.blocks = card->host->max_blk_count;
 314
 315                 /*
 316                  * After a read error, we redo the request one sector at a time
 317                  * in order to accurately determine which sectors can be read
 318                  * successfully.
 319                  */
 320                 if (disable_multi && brq.data.blocks > 1)
 321                         brq.data.blocks = 1;
 322
 323                 if (brq.data.blocks > 1) {
 324                         /* SPI multiblock writes terminate using a special
 325                          * token, not a STOP_TRANSMISSION request.
 326                          */
 327                         if (!mmc_host_is_spi(card->host)
 328                                         || rq_data_dir(req) == READ)
 329                                 brq.mrq.stop = &brq.stop;
 330                         readcmd = MMC_READ_MULTIPLE_BLOCK;
 331                         writecmd = MMC_WRITE_MULTIPLE_BLOCK;
 332                 } else {
 333                         brq.mrq.stop = NULL;
 334                         readcmd = MMC_READ_SINGLE_BLOCK;
 335                         writecmd = MMC_WRITE_BLOCK;
 336                 }
 337
 338                 if (rq_data_dir(req) == READ) {
 339                         brq.cmd.opcode = readcmd;
 340                         brq.data.flags |= MMC_DATA_READ;
 341                 } else {
 342                         brq.cmd.opcode = writecmd;
 343                         brq.data.flags |= MMC_DATA_WRITE;
 344                 }
 345
 346                 mmc_set_data_timeout(&brq.data, card);
 347
 348                 brq.data.sg = mq->sg;
 349                 brq.data.sg_len = mmc_queue_map_sg(mq);
 350
 351                 /*
 352                  * Adjust the sg list so it is the same size as the
 353                  * request.
 354                  */
 355                 if (brq.data.blocks != blk_rq_sectors(req)) {
 356                         int i, data_size = brq.data.blocks << 9;
 357                         struct scatterlist *sg;
 358
 359                         for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
 360                                 data_size -= sg->length;
 361                                 if (data_size <= 0) {
 362                                         sg->length += data_size;
 363                                         i++;
 364                                         break;
 365                                 }
 366                         }
 367                         brq.data.sg_len = i;
 368                 }
 369
 370                 mmc_queue_bounce_pre(mq);
 371
 372                 mmc_wait_for_req(card->host, &brq.mrq);
 373
 374                 mmc_queue_bounce_post(mq);
 375
 376                 /*
 377                  * Check for errors here, but don't jump to cmd_err
 378                  * until later as we need to wait for the card to leave
 379                  * programming mode even when things go wrong.
 380                  */
 381                 #if 1/*[xjh] do not retry with cmd17*/
 382                 if (brq.cmd.error || brq.data.error || brq.stop.error) {
 383
 384                         if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
 385                                 /* Redo read one sector at a time */
 386                                 printk(KERN_WARNING "%s: retrying using single "
 387                                        "block read\n", req->rq_disk->disk_name);
 388                                 disable_multi = 1;
 389                                 continue;
 390                         }
 391
 392                         status = get_card_status(card, req);
 393                 } else if (disable_multi == 1) {
 394                         disable_multi = 0;
 395                 }
 396                 #endif
 397
 398                 #if 0 //[xjh] not printk,save time
 399                 if (brq.cmd.error) {
 400                         printk(KERN_ERR "%s: error %d sending read/write "
 401                                "command, response %#x, card status %#x\n",
 402                                req->rq_disk->disk_name, brq.cmd.error,
 403                                brq.cmd.resp[0], status);
 404                 }
 405
 406                 if (brq.data.error) {
 407                         if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
 408                                 /* 'Stop' response contains card status */
 409                                 status = brq.mrq.stop->resp[0];
 410                         printk(KERN_ERR "%s: error %d transferring data,"
 411                                " sector %u, nr %u, card status %#x\n",
 412                                req->rq_disk->disk_name, brq.data.error,
 413                                (unsigned)blk_rq_pos(req),
 414                                (unsigned)blk_rq_sectors(req), status);
 415                 }
 416
 417                 if (brq.stop.error) {
 418                         printk(KERN_ERR "%s: error %d sending stop command, "
 419                                "response %#x, card status %#x\n",
 420                                req->rq_disk->disk_name, brq.stop.error,
 421                                brq.stop.resp[0], status);
 422                 }
 423                 #endif
 424
 425                 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
 426                         do {
 427                                 int err;
 428
 429                                 cmd.opcode = MMC_SEND_STATUS;
 430                                 cmd.arg = card->rca << 16;
 431                                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 432                                 err = mmc_wait_for_cmd(card->host, &cmd, 5);
 433                                 if (err) {
 434                                         printk(KERN_ERR "%s: error %d requesting status\n",
 435                                                req->rq_disk->disk_name, err);
 436                                         goto cmd_err;
 437                                 }
 438                                 /*
 439                                  * Some cards mishandle the status bits,
 440                                  * so make sure to check both the busy
 441                                  * indication and the card state.
 442                                  */
 443                         } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
 444                                 (R1_CURRENT_STATE(cmd.resp[0]) == 7));
 445
 446 #if 0
 447                         if (cmd.resp[0] & ~0x00000900)
 448                                 printk(KERN_ERR "%s: status = %08x\n",
 449                                        req->rq_disk->disk_name, cmd.resp[0]);
 450                         if (mmc_decode_status(cmd.resp))
 451                                 goto cmd_err;
 452 #endif
 453                 }
 454
 455                 if (brq.cmd.error || brq.stop.error || brq.data.error) {
 456                         #if 1/*[xjh] do not retry with cmd17*/
 457                         if (rq_data_dir(req) == READ) {
 458                                 /*
 459                                  * After an error, we redo I/O one sector at a
 460                                  * time, so we only reach here after trying to
 461                                  * read a single sector.
 462                                  */
 463                                 spin_lock_irq(&md->lock);
 464                                 ret = __blk_end_request(req, -EIO, brq.data.blksz);
 465                                 spin_unlock_irq(&md->lock);
 466                                 continue;
 467                         }
 468                         #endif
 469                         goto cmd_err;
 470                 }
 471
 472                 /*
 473                  * A block was successfully transferred.
 474                  */
 475                 spin_lock_irq(&md->lock);
 476                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 477                 spin_unlock_irq(&md->lock);
 478         } while (ret);
 479
 480         mmc_release_host(card->host);
 481
 482         return 1;
 483
 484  cmd_err:
 485         /*
 486          * If this is an SD card and we're writing, we can first
 487          * mark the known good sectors as ok.
 488          *
 489          * If the card is not SD, we can still ok written sectors
 490          * as reported by the controller (which might be less than
 491          * the real number of written sectors, but never more).
 492          */
 493         if (mmc_card_sd(card)) {
 494                 u32 blocks;
 495
 496                 blocks = mmc_sd_num_wr_blocks(card);
 497                 if (blocks != (u32)-1) {
 498                         spin_lock_irq(&md->lock);
 499                         ret = __blk_end_request(req, 0, blocks << 9);
 500                         spin_unlock_irq(&md->lock);
 501                 }
 502         } else {
 503                 spin_lock_irq(&md->lock);
 504                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 505                 spin_unlock_irq(&md->lock);
 506         }
 507
 508         mmc_release_host(card->host);
 509
 510         spin_lock_irq(&md->lock);
 511         while (ret)
 512                 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
 513         spin_unlock_irq(&md->lock);
 514
 515         return 0;
 516 }
 517
 518
 519 static inline int mmc_blk_readonly(struct mmc_card *card)
 520 {
 521         return mmc_card_readonly(card) ||
 522                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
 523 }
 524
 525 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
 526 {
 527         struct mmc_blk_data *md;
 528         int devidx, ret;
 529
 530         devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
 531         if (devidx >= MMC_NUM_MINORS)
 532                 return ERR_PTR(-ENOSPC);
 533         __set_bit(devidx, dev_use);
 534
 535         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
 536         if (!md) {
 537                 ret = -ENOMEM;
 538                 goto out;
 539         }
 540
 541
 542         /*
 543          * Set the read-only status based on the supported commands
 544          * and the write protect switch.
 545          */
 546         md->read_only = mmc_blk_readonly(card);
 547
 548         md->disk = alloc_disk(1 << MMC_SHIFT);
 549         if (md->disk == NULL) {
 550                 ret = -ENOMEM;
 551                 goto err_kfree;
 552         }
 553
 554         spin_lock_init(&md->lock);
 555         md->usage = 1;
 556
 557         ret = mmc_init_queue(&md->queue, card, &md->lock);
 558         if (ret)
 559                 goto err_putdisk;
 560
 561         md->queue.issue_fn = mmc_blk_issue_rq;
 562         md->queue.data = md;
 563
 564         md->disk->major = MMC_BLOCK_MAJOR;
 565         md->disk->first_minor = devidx << MMC_SHIFT;
 566         md->disk->fops = &mmc_bdops;
 567         md->disk->private_data = md;
 568         md->disk->queue = md->queue.queue;
 569         md->disk->driverfs_dev = &card->dev;
 570
 571         /*
 572          * As discussed on lkml, GENHD_FL_REMOVABLE should:
 573          *
 574          * - be set for removable media with permanent block devices
 575          * - be unset for removable block devices with permanent media
 576          *
 577          * Since MMC block devices clearly fall under the second
 578          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
 579          * should use the block device creation/destruction hotplug
 580          * messages to tell when the card is present.
 581          */
 582
 583         sprintf(md->disk->disk_name, "mmcblk%d", devidx);
 584
 585         blk_queue_logical_block_size(md->queue.queue, 512);
 586
 587         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
 588                 /*
 589                  * The EXT_CSD sector count is in number or 512 byte
 590                  * sectors.
 591                  */
 592                 set_capacity(md->disk, card->ext_csd.sectors);
 593         } else {
 594                 /*
 595                  * The CSD capacity field is in units of read_blkbits.
 596                  * set_capacity takes units of 512 bytes.
 597                  */
 598                 set_capacity(md->disk,
 599                         card->csd.capacity << (card->csd.read_blkbits - 9));
 600         }
 601         return md;
 602
 603  err_putdisk:
 604         put_disk(md->disk);
 605  err_kfree:
 606         kfree(md);
 607  out:
 608         return ERR_PTR(ret);
 609 }
 610
 611 static int mmc_blk_probe(struct mmc_card *card)
 612 {
 613         struct mmc_blk_data *md;
 614         int err;
 615
 616         char cap_str[10];
 617
 618         /*
 619          * Check that the card supports the command class(es) we need.
 620          */
 621         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
 622                 return -ENODEV;
 623
 624         md = mmc_blk_alloc(card);
 625         if (IS_ERR(md))
 626                 return PTR_ERR(md);
 627
 628         err = mmc_blk_set_blksize(md, card);
 629         if (err)
 630                 goto out;
 631
 632         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
 633                         cap_str, sizeof(cap_str));
 634         printk(KERN_INFO "%s: %s %s %s %s\n",
 635                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
 636                 cap_str, md->read_only ? "(ro)" : "");
 637
 638         mmc_set_drvdata(card, md);
 639 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 640         mmc_set_bus_resume_policy(card->host, 1);
 641 #endif
 642         add_disk(md->disk);
 643         return 0;
 644
 645  out:
 646         mmc_cleanup_queue(&md->queue);
 647         mmc_blk_put(md);
 648
 649         return err;
 650 }
 651
 652 static void mmc_blk_remove(struct mmc_card *card)
 653 {
 654         struct mmc_blk_data *md = mmc_get_drvdata(card);
 655
 656         if (md) {
 657                 /* Stop new requests from getting into the queue */
 658                 del_gendisk(md->disk);
 659
 660                 /* Then flush out any already in there */
 661                 mmc_cleanup_queue(&md->queue);
 662
 663                 mmc_blk_put(md);
 664         }
 665         mmc_set_drvdata(card, NULL);
 666 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 667         mmc_set_bus_resume_policy(card->host, 0);
 668 #endif
 669 }
 670
 671 #ifdef CONFIG_PM
 672 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
 673 {
 674         struct mmc_blk_data *md = mmc_get_drvdata(card);
 675
 676         if (md) {
 677                 mmc_queue_suspend(&md->queue);
 678         }
 679         return 0;
 680 }
 681
 682 static int mmc_blk_resume(struct mmc_card *card)
 683 {
 684         struct mmc_blk_data *md = mmc_get_drvdata(card);
 685
 686         if (md) {
 687 #ifndef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 688                 mmc_blk_set_blksize(md, card);
 689 #endif
 690                 mmc_queue_resume(&md->queue);
 691         }
 692         return 0;
 693 }
 694 #else
 695 #define mmc_blk_suspend NULL
 696 #define mmc_blk_resume  NULL
 697 #endif
 698
 699 static struct mmc_driver mmc_driver = {
 700         .drv            = {
 701                 .name   = "mmcblk",
 702         },
 703         .probe          = mmc_blk_probe,
 704         .remove         = mmc_blk_remove,
 705         .suspend        = mmc_blk_suspend,
 706         .resume         = mmc_blk_resume,
 707 };
 708
 709 static int __init mmc_blk_init(void)
 710 {
 711         int res;
 712
 713         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
 714         if (res)
 715                 goto out;
 716
 717         res = mmc_register_driver(&mmc_driver);
 718         if (res)
 719                 goto out2;
 720
 721         return 0;
 722  out2:
 723         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 724  out:
 725         return res;
 726 }
 727
 728 static void __exit mmc_blk_exit(void)
 729 {
 730         mmc_unregister_driver(&mmc_driver);
 731         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 732 }
 733
 734 module_init(mmc_blk_init);
 735 module_exit(mmc_blk_exit);
 736
 737 MODULE_LICENSE("GPL");
 738 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
 739