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/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/smp_lock.h>
  33 #include <linux/scatterlist.h>
  34 #include <linux/string_helpers.h>
  35
  36 #include <linux/mmc/card.h>
  37 #include <linux/mmc/host.h>
  38 #include <linux/mmc/mmc.h>
  39 #include <linux/mmc/sd.h>
  40
  41 #include <asm/system.h>
  42 #include <asm/uaccess.h>
  43
  44 #include "queue.h"
  45
  46 MODULE_ALIAS("mmc:block");
  47
  48 /*
  49  * max 8 partitions per card
  50  */
  51 #define MMC_SHIFT       3
  52 #define MMC_NUM_MINORS  (256 >> MMC_SHIFT)
  53
  54 static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS);
  55
  56 /*
  57  * There is one mmc_blk_data per slot.
  58  */
  59 struct mmc_blk_data {
  60         spinlock_t      lock;
  61         struct gendisk  *disk;
  62         struct mmc_queue queue;
  63
  64         unsigned int    usage;
  65         unsigned int    read_only;
  66 };
  67
  68 static DEFINE_MUTEX(open_lock);
  69
  70 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
  71 {
  72         struct mmc_blk_data *md;
  73
  74         mutex_lock(&open_lock);
  75         md = disk->private_data;
  76         if (md && md->usage == 0)
  77                 md = NULL;
  78         if (md)
  79                 md->usage++;
  80         mutex_unlock(&open_lock);
  81
  82         return md;
  83 }
  84
  85 static void mmc_blk_put(struct mmc_blk_data *md)
  86 {
  87         mutex_lock(&open_lock);
  88         md->usage--;
  89         if (md->usage == 0) {
  90                 int devmaj = MAJOR(disk_devt(md->disk));
  91                 int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT;
  92
  93                 if (!devmaj)
  94                         devidx = md->disk->first_minor >> MMC_SHIFT;
  95
  96                 blk_cleanup_queue(md->queue.queue);
  97
  98                 __clear_bit(devidx, dev_use);
  99
 100                 put_disk(md->disk);
 101                 kfree(md);
 102         }
 103         mutex_unlock(&open_lock);
 104 }
 105
 106 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 107 {
 108         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 109         int ret = -ENXIO;
 110
 111         lock_kernel();
 112         if (md) {
 113                 if (md->usage == 2)
 114                         check_disk_change(bdev);
 115                 ret = 0;
 116
 117                 if ((mode & FMODE_WRITE) && md->read_only) {
 118                         mmc_blk_put(md);
 119                         ret = -EROFS;
 120                 }
 121         }
 122         unlock_kernel();
 123
 124         return ret;
 125 }
 126
 127 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
 128 {
 129         struct mmc_blk_data *md = disk->private_data;
 130
 131         lock_kernel();
 132         mmc_blk_put(md);
 133         unlock_kernel();
 134         return 0;
 135 }
 136
 137 static int
 138 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 139 {
 140         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 141         geo->heads = 4;
 142         geo->sectors = 16;
 143         return 0;
 144 }
 145
 146 static const struct block_device_operations mmc_bdops = {
 147         .open                   = mmc_blk_open,
 148         .release                = mmc_blk_release,
 149         .getgeo                 = mmc_blk_getgeo,
 150         .owner                  = THIS_MODULE,
 151 };
 152
 153 struct mmc_blk_request {
 154         struct mmc_request      mrq;
 155         struct mmc_command      cmd;
 156         struct mmc_command      stop;
 157         struct mmc_data         data;
 158 };
 159
 160 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 161 {
 162         int err;
 163         u32 result;
 164         __be32 *blocks;
 165
 166         struct mmc_request mrq;
 167         struct mmc_command cmd;
 168         struct mmc_data data;
 169         unsigned int timeout_us;
 170
 171         struct scatterlist sg;
 172
 173         memset(&cmd, 0, sizeof(struct mmc_command));
 174
 175         cmd.opcode = MMC_APP_CMD;
 176         cmd.arg = card->rca << 16;
 177         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 178
 179         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 180         if (err)
 181                 return (u32)-1;
 182         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 183                 return (u32)-1;
 184
 185         memset(&cmd, 0, sizeof(struct mmc_command));
 186
 187         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 188         cmd.arg = 0;
 189         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 190
 191         memset(&data, 0, sizeof(struct mmc_data));
 192
 193         data.timeout_ns = card->csd.tacc_ns * 100;
 194         data.timeout_clks = card->csd.tacc_clks * 100;
 195
 196         timeout_us = data.timeout_ns / 1000;
 197         timeout_us += data.timeout_clks * 1000 /
 198                 (card->host->ios.clock / 1000);
 199
 200         if (timeout_us > 100000) {
 201                 data.timeout_ns = 100000000;
 202                 data.timeout_clks = 0;
 203         }
 204
 205         data.blksz = 4;
 206         data.blocks = 1;
 207         data.flags = MMC_DATA_READ;
 208         data.sg = &sg;
 209         data.sg_len = 1;
 210
 211         memset(&mrq, 0, sizeof(struct mmc_request));
 212
 213         mrq.cmd = &cmd;
 214         mrq.data = &data;
 215
 216         blocks = kmalloc(4, GFP_KERNEL);
 217         if (!blocks)
 218                 return (u32)-1;
 219
 220         sg_init_one(&sg, blocks, 4);
 221
 222         mmc_wait_for_req(card->host, &mrq);
 223
 224         result = ntohl(*blocks);
 225         kfree(blocks);
 226
 227         if (cmd.error || data.error)
 228                 result = (u32)-1;
 229
 230         return result;
 231 }
 232
 233 static u32 get_card_status(struct mmc_card *card, struct request *req)
 234 {
 235         struct mmc_command cmd;
 236         int err;
 237
 238         memset(&cmd, 0, sizeof(struct mmc_command));
 239         cmd.opcode = MMC_SEND_STATUS;
 240         if (!mmc_host_is_spi(card->host))
 241                 cmd.arg = card->rca << 16;
 242         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 243         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 244         if (err)
 245                 printk(KERN_ERR "%s: error %d sending status comand",
 246                        req->rq_disk->disk_name, err);
 247         return cmd.resp[0];
 248 }
 249
 250 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
 251 {
 252         struct mmc_blk_data *md = mq->data;
 253         struct mmc_card *card = md->queue.card;
 254         unsigned int from, nr, arg;
 255         int err = 0;
 256
 257         mmc_claim_host(card->host);
 258
 259         if (!mmc_can_erase(card)) {
 260                 err = -EOPNOTSUPP;
 261                 goto out;
 262         }
 263
 264         from = blk_rq_pos(req);
 265         nr = blk_rq_sectors(req);
 266
 267         if (mmc_can_trim(card))
 268                 arg = MMC_TRIM_ARG;
 269         else
 270                 arg = MMC_ERASE_ARG;
 271
 272         err = mmc_erase(card, from, nr, arg);
 273 out:
 274         spin_lock_irq(&md->lock);
 275         __blk_end_request(req, err, blk_rq_bytes(req));
 276         spin_unlock_irq(&md->lock);
 277
 278         mmc_release_host(card->host);
 279
 280         return err ? 0 : 1;
 281 }
 282
 283 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
 284 {
 285         struct mmc_blk_data *md = mq->data;
 286         struct mmc_card *card = md->queue.card;
 287         struct mmc_blk_request brq;
 288         int ret = 1, disable_multi = 0;
 289
 290         mmc_claim_host(card->host);
 291
 292         do {
 293                 struct mmc_command cmd;
 294                 u32 readcmd, writecmd, status = 0;
 295
 296                 memset(&brq, 0, sizeof(struct mmc_blk_request));
 297                 brq.mrq.cmd = &brq.cmd;
 298                 brq.mrq.data = &brq.data;
 299
 300                 brq.cmd.arg = blk_rq_pos(req);
 301                 if (!mmc_card_blockaddr(card))
 302                         brq.cmd.arg <<= 9;
 303                 brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 304                 brq.data.blksz = 512;
 305                 brq.stop.opcode = MMC_STOP_TRANSMISSION;
 306                 brq.stop.arg = 0;
 307                 brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 308                 brq.data.blocks = blk_rq_sectors(req);
 309
 310                 /*
 311                  * The block layer doesn't support all sector count
 312                  * restrictions, so we need to be prepared for too big
 313                  * requests.
 314                  */
 315                 if (brq.data.blocks > card->host->max_blk_count)
 316                         brq.data.blocks = card->host->max_blk_count;
 317
 318                 /*
 319                  * After a read error, we redo the request one sector at a time
 320                  * in order to accurately determine which sectors can be read
 321                  * successfully.
 322                  */
 323                 if (disable_multi && brq.data.blocks > 1)
 324                         brq.data.blocks = 1;
 325
 326                 if (brq.data.blocks > 1) {
 327                         /* SPI multiblock writes terminate using a special
 328                          * token, not a STOP_TRANSMISSION request.
 329                          */
 330                         if (!mmc_host_is_spi(card->host)
 331                                         || rq_data_dir(req) == READ)
 332                                 brq.mrq.stop = &brq.stop;
 333                         readcmd = MMC_READ_MULTIPLE_BLOCK;
 334                         writecmd = MMC_WRITE_MULTIPLE_BLOCK;
 335                 } else {
 336                         brq.mrq.stop = NULL;
 337                         readcmd = MMC_READ_SINGLE_BLOCK;
 338                         writecmd = MMC_WRITE_BLOCK;
 339                 }
 340
 341                 if (rq_data_dir(req) == READ) {
 342                         brq.cmd.opcode = readcmd;
 343                         brq.data.flags |= MMC_DATA_READ;
 344                 } else {
 345                         brq.cmd.opcode = writecmd;
 346                         brq.data.flags |= MMC_DATA_WRITE;
 347                 }
 348
 349                 mmc_set_data_timeout(&brq.data, card);
 350
 351                 brq.data.sg = mq->sg;
 352                 brq.data.sg_len = mmc_queue_map_sg(mq);
 353
 354                 /*
 355                  * Adjust the sg list so it is the same size as the
 356                  * request.
 357                  */
 358                 if (brq.data.blocks != blk_rq_sectors(req)) {
 359                         int i, data_size = brq.data.blocks << 9;
 360                         struct scatterlist *sg;
 361
 362                         for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
 363                                 data_size -= sg->length;
 364                                 if (data_size <= 0) {
 365                                         sg->length += data_size;
 366                                         i++;
 367                                         break;
 368                                 }
 369                         }
 370                         brq.data.sg_len = i;
 371                 }
 372
 373                 mmc_queue_bounce_pre(mq);
 374
 375                 mmc_wait_for_req(card->host, &brq.mrq);
 376
 377                 mmc_queue_bounce_post(mq);
 378
 379                 /*
 380                  * Check for errors here, but don't jump to cmd_err
 381                  * until later as we need to wait for the card to leave
 382                  * programming mode even when things go wrong.
 383                  */
 384                 if (brq.cmd.error || brq.data.error || brq.stop.error) {
 385                         if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
 386                                 /* Redo read one sector at a time */
 387                                 printk(KERN_WARNING "%s: retrying using single "
 388                                        "block read\n", req->rq_disk->disk_name);
 389                                 disable_multi = 1;
 390                                 continue;
 391                         }
 392                         status = get_card_status(card, req);
 393                 }
 394
 395                 if (brq.cmd.error) {
 396                         printk(KERN_ERR "%s: error %d sending read/write "
 397                                "command, response %#x, card status %#x\n",
 398                                req->rq_disk->disk_name, brq.cmd.error,
 399                                brq.cmd.resp[0], status);
 400                 }
 401
 402                 if (brq.data.error) {
 403                         if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
 404                                 /* 'Stop' response contains card status */
 405                                 status = brq.mrq.stop->resp[0];
 406                         printk(KERN_ERR "%s: error %d transferring data,"
 407                                " sector %u, nr %u, card status %#x\n",
 408                                req->rq_disk->disk_name, brq.data.error,
 409                                (unsigned)blk_rq_pos(req),
 410                                (unsigned)blk_rq_sectors(req), status);
 411                 }
 412
 413                 if (brq.stop.error) {
 414                         printk(KERN_ERR "%s: error %d sending stop command, "
 415                                "response %#x, card status %#x\n",
 416                                req->rq_disk->disk_name, brq.stop.error,
 417                                brq.stop.resp[0], status);
 418                 }
 419
 420                 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
 421                         do {
 422                                 int err;
 423
 424                                 cmd.opcode = MMC_SEND_STATUS;
 425                                 cmd.arg = card->rca << 16;
 426                                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 427                                 err = mmc_wait_for_cmd(card->host, &cmd, 5);
 428                                 if (err) {
 429                                         printk(KERN_ERR "%s: error %d requesting status\n",
 430                                                req->rq_disk->disk_name, err);
 431                                         goto cmd_err;
 432                                 }
 433                                 /*
 434                                  * Some cards mishandle the status bits,
 435                                  * so make sure to check both the busy
 436                                  * indication and the card state.
 437                                  */
 438                         } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
 439                                 (R1_CURRENT_STATE(cmd.resp[0]) == 7));
 440
 441 #if 0
 442                         if (cmd.resp[0] & ~0x00000900)
 443                                 printk(KERN_ERR "%s: status = %08x\n",
 444                                        req->rq_disk->disk_name, cmd.resp[0]);
 445                         if (mmc_decode_status(cmd.resp))
 446                                 goto cmd_err;
 447 #endif
 448                 }
 449
 450                 if (brq.cmd.error || brq.stop.error || brq.data.error) {
 451                         if (rq_data_dir(req) == READ) {
 452                                 /*
 453                                  * After an error, we redo I/O one sector at a
 454                                  * time, so we only reach here after trying to
 455                                  * read a single sector.
 456                                  */
 457                                 spin_lock_irq(&md->lock);
 458                                 ret = __blk_end_request(req, -EIO, brq.data.blksz);
 459                                 spin_unlock_irq(&md->lock);
 460                                 continue;
 461                         }
 462                         goto cmd_err;
 463                 }
 464
 465                 /*
 466                  * A block was successfully transferred.
 467                  */
 468                 spin_lock_irq(&md->lock);
 469                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 470                 spin_unlock_irq(&md->lock);
 471         } while (ret);
 472
 473         mmc_release_host(card->host);
 474
 475         return 1;
 476
 477  cmd_err:
 478         /*
 479          * If this is an SD card and we're writing, we can first
 480          * mark the known good sectors as ok.
 481          *
 482          * If the card is not SD, we can still ok written sectors
 483          * as reported by the controller (which might be less than
 484          * the real number of written sectors, but never more).
 485          */
 486         if (mmc_card_sd(card)) {
 487                 u32 blocks;
 488
 489                 blocks = mmc_sd_num_wr_blocks(card);
 490                 if (blocks != (u32)-1) {
 491                         spin_lock_irq(&md->lock);
 492                         ret = __blk_end_request(req, 0, blocks << 9);
 493                         spin_unlock_irq(&md->lock);
 494                 }
 495         } else {
 496                 spin_lock_irq(&md->lock);
 497                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 498                 spin_unlock_irq(&md->lock);
 499         }
 500
 501         mmc_release_host(card->host);
 502
 503         spin_lock_irq(&md->lock);
 504         while (ret)
 505                 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
 506         spin_unlock_irq(&md->lock);
 507
 508         return 0;
 509 }
 510
 511 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 512 {
 513         if (req->cmd_flags & REQ_DISCARD)
 514                 return mmc_blk_issue_discard_rq(mq, req);
 515         else
 516                 return mmc_blk_issue_rw_rq(mq, req);
 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
 612 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
 613 {
 614         struct mmc_command cmd;
 615         int err;
 616
 617         /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
 618         if (mmc_card_blockaddr(card))
 619                 return 0;
 620
 621         mmc_claim_host(card->host);
 622         cmd.opcode = MMC_SET_BLOCKLEN;
 623         cmd.arg = 512;
 624         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 625         err = mmc_wait_for_cmd(card->host, &cmd, 5);
 626         mmc_release_host(card->host);
 627
 628         if (err) {
 629                 printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
 630                         md->disk->disk_name, cmd.arg, err);
 631                 return -EINVAL;
 632         }
 633
 634         return 0;
 635 }
 636
 637 static int mmc_blk_probe(struct mmc_card *card)
 638 {
 639         struct mmc_blk_data *md;
 640         int err;
 641
 642         char cap_str[10];
 643
 644         /*
 645          * Check that the card supports the command class(es) we need.
 646          */
 647         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
 648                 return -ENODEV;
 649
 650         md = mmc_blk_alloc(card);
 651         if (IS_ERR(md))
 652                 return PTR_ERR(md);
 653
 654         err = mmc_blk_set_blksize(md, card);
 655         if (err)
 656                 goto out;
 657
 658         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
 659                         cap_str, sizeof(cap_str));
 660         printk(KERN_INFO "%s: %s %s %s %s\n",
 661                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
 662                 cap_str, md->read_only ? "(ro)" : "");
 663
 664         mmc_set_drvdata(card, md);
 665         add_disk(md->disk);
 666         return 0;
 667
 668  out:
 669         mmc_cleanup_queue(&md->queue);
 670         mmc_blk_put(md);
 671
 672         return err;
 673 }
 674
 675 static void mmc_blk_remove(struct mmc_card *card)
 676 {
 677         struct mmc_blk_data *md = mmc_get_drvdata(card);
 678
 679         if (md) {
 680                 /* Stop new requests from getting into the queue */
 681                 del_gendisk(md->disk);
 682
 683                 /* Then flush out any already in there */
 684                 mmc_cleanup_queue(&md->queue);
 685
 686                 mmc_blk_put(md);
 687         }
 688         mmc_set_drvdata(card, NULL);
 689 }
 690
 691 #ifdef CONFIG_PM
 692 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
 693 {
 694         struct mmc_blk_data *md = mmc_get_drvdata(card);
 695
 696         if (md) {
 697                 mmc_queue_suspend(&md->queue);
 698         }
 699         return 0;
 700 }
 701
 702 static int mmc_blk_resume(struct mmc_card *card)
 703 {
 704         struct mmc_blk_data *md = mmc_get_drvdata(card);
 705
 706         if (md) {
 707                 mmc_blk_set_blksize(md, card);
 708                 mmc_queue_resume(&md->queue);
 709         }
 710         return 0;
 711 }
 712 #else
 713 #define mmc_blk_suspend NULL
 714 #define mmc_blk_resume  NULL
 715 #endif
 716
 717 static struct mmc_driver mmc_driver = {
 718         .drv            = {
 719                 .name   = "mmcblk",
 720         },
 721         .probe          = mmc_blk_probe,
 722         .remove         = mmc_blk_remove,
 723         .suspend        = mmc_blk_suspend,
 724         .resume         = mmc_blk_resume,
 725 };
 726
 727 static int __init mmc_blk_init(void)
 728 {
 729         int res;
 730
 731         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
 732         if (res)
 733                 goto out;
 734
 735         res = mmc_register_driver(&mmc_driver);
 736         if (res)
 737                 goto out2;
 738
 739         return 0;
 740  out2:
 741         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 742  out:
 743         return res;
 744 }
 745
 746 static void __exit mmc_blk_exit(void)
 747 {
 748         mmc_unregister_driver(&mmc_driver);
 749         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 750 }
 751
 752 module_init(mmc_blk_init);
 753 module_exit(mmc_blk_exit);
 754
 755 MODULE_LICENSE("GPL");
 756 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
 757