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 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
  47 static DEFINE_MUTEX(block_mutex); //added by xbw at 2011-04-21
  48 #endif
  49
  50 /*
  51  * max 8 partitions per card
  52  */
  53 #define MMC_SHIFT       3
  54 #define MMC_NUM_MINORS  (256 >> MMC_SHIFT)
  55
  56 static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS);
  57
  58 /*
  59  * There is one mmc_blk_data per slot.
  60  */
  61 struct mmc_blk_data {
  62         spinlock_t      lock;
  63         struct gendisk  *disk;
  64         struct mmc_queue queue;
  65
  66         unsigned int    usage;
  67         unsigned int    read_only;
  68 };
  69
  70 static DEFINE_MUTEX(open_lock);
  71
  72 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
  73 {
  74         struct mmc_blk_data *md;
  75
  76         mutex_lock(&open_lock);
  77         md = disk->private_data;
  78         if (md && md->usage == 0)
  79                 md = NULL;
  80         if (md)
  81                 md->usage++;
  82         mutex_unlock(&open_lock);
  83
  84         return md;
  85 }
  86
  87 static void mmc_blk_put(struct mmc_blk_data *md)
  88 {
  89         mutex_lock(&open_lock);
  90         md->usage--;
  91         if (md->usage == 0) {
  92                 int devmaj = MAJOR(disk_devt(md->disk));
  93                 int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT;
  94
  95                 if (!devmaj)
  96                         devidx = md->disk->first_minor >> MMC_SHIFT;
  97
  98                 blk_cleanup_queue(md->queue.queue);
  99
 100                 __clear_bit(devidx, dev_use);
 101
 102                 put_disk(md->disk);
 103                 kfree(md);
 104         }
 105         mutex_unlock(&open_lock);
 106 }
 107
 108 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 109 {
 110         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 111         int ret = -ENXIO;
 112
 113 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
 114         mutex_lock(&block_mutex); //added by xbw at 2011-04-21
 115 #endif
 116
 117         if (md) {
 118                 if (md->usage == 2)
 119                         check_disk_change(bdev);
 120                 ret = 0;
 121
 122                 if ((mode & FMODE_WRITE) && md->read_only) {
 123                         mmc_blk_put(md);
 124                         ret = -EROFS;
 125                 }
 126         }
 127 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
 128         mutex_unlock(&block_mutex);
 129 #endif
 130
 131         return ret;
 132 }
 133
 134 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
 135 {
 136         struct mmc_blk_data *md = disk->private_data;
 137
 138 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
 139         mutex_lock(&block_mutex); //added by xbw at 2011-04-21
 140 #endif
 141
 142         mmc_blk_put(md);
 143
 144 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
 145         mutex_unlock(&block_mutex);
 146 #endif
 147
 148         return 0;
 149 }
 150
 151 static int
 152 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 153 {
 154         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 155         geo->heads = 4;
 156         geo->sectors = 16;
 157         return 0;
 158 }
 159
 160 static const struct block_device_operations mmc_bdops = {
 161         .open                   = mmc_blk_open,
 162         .release                = mmc_blk_release,
 163         .getgeo                 = mmc_blk_getgeo,
 164         .owner                  = THIS_MODULE,
 165 };
 166
 167 struct mmc_blk_request {
 168         struct mmc_request      mrq;
 169         struct mmc_command      cmd;
 170         struct mmc_command      stop;
 171         struct mmc_data         data;
 172 };
 173
 174 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 175 {
 176         int err;
 177         u32 result;
 178         __be32 *blocks;
 179
 180         struct mmc_request mrq;
 181         struct mmc_command cmd;
 182         struct mmc_data data;
 183         unsigned int timeout_us;
 184
 185         struct scatterlist sg;
 186
 187         memset(&cmd, 0, sizeof(struct mmc_command));
 188
 189         cmd.opcode = MMC_APP_CMD;
 190         cmd.arg = card->rca << 16;
 191         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 192
 193         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 194         if (err)
 195                 return (u32)-1;
 196         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 197                 return (u32)-1;
 198
 199         memset(&cmd, 0, sizeof(struct mmc_command));
 200
 201         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 202         cmd.arg = 0;
 203         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 204
 205         memset(&data, 0, sizeof(struct mmc_data));
 206
 207         data.timeout_ns = card->csd.tacc_ns * 100;
 208         data.timeout_clks = card->csd.tacc_clks * 100;
 209
 210         timeout_us = data.timeout_ns / 1000;
 211         timeout_us += data.timeout_clks * 1000 /
 212                 (card->host->ios.clock / 1000);
 213
 214         if (timeout_us > 100000) {
 215                 data.timeout_ns = 100000000;
 216                 data.timeout_clks = 0;
 217         }
 218
 219         data.blksz = 4;
 220         data.blocks = 1;
 221         data.flags = MMC_DATA_READ;
 222         data.sg = &sg;
 223         data.sg_len = 1;
 224
 225         memset(&mrq, 0, sizeof(struct mmc_request));
 226
 227         mrq.cmd = &cmd;
 228         mrq.data = &data;
 229
 230         blocks = kmalloc(4, GFP_KERNEL);
 231         if (!blocks)
 232                 return (u32)-1;
 233
 234         sg_init_one(&sg, blocks, 4);
 235
 236         mmc_wait_for_req(card->host, &mrq);
 237
 238         result = ntohl(*blocks);
 239         kfree(blocks);
 240
 241         if (cmd.error || data.error)
 242                 result = (u32)-1;
 243
 244         return result;
 245 }
 246
 247 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD) //Deleted by xbw@2011-03-21
 248 //static u32 get_card_status(struct mmc_card *card, struct request *req)
 249 //{
 250 //   return 0;
 251 //}
 252
 253 #else
 254 static u32 get_card_status(struct mmc_card *card, struct request *req)
 255 {
 256         struct mmc_command cmd;
 257         int err;
 258
 259         memset(&cmd, 0, sizeof(struct mmc_command));
 260         cmd.opcode = MMC_SEND_STATUS;
 261         if (!mmc_host_is_spi(card->host))
 262                 cmd.arg = card->rca << 16;
 263         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 264         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 265         if (err)
 266                 printk(KERN_DEBUG "%s: error %d sending status comand",
 267                        req->rq_disk->disk_name, err);
 268         return cmd.resp[0];
 269 }
 270 #endif
 271
 272 static int
 273 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
 274 {
 275         struct mmc_command cmd;
 276         int err;
 277
 278         /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
 279         if (mmc_card_blockaddr(card))
 280                 return 0;
 281
 282         mmc_claim_host(card->host);
 283         cmd.opcode = MMC_SET_BLOCKLEN;
 284         cmd.arg = 512;
 285         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 286         err = mmc_wait_for_cmd(card->host, &cmd, 5);
 287         mmc_release_host(card->host);
 288
 289         if (err) {
 290                 printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
 291                         md->disk->disk_name, cmd.arg, err);
 292                 return -EINVAL;
 293         }
 294
 295         return 0;
 296 }
 297
 298
 299 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 300 {
 301         struct mmc_blk_data *md = mq->data;
 302         struct mmc_card *card = md->queue.card;
 303         struct mmc_blk_request brq;
 304         int ret = 1, disable_multi = 0;
 305
 306 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 307         if (mmc_bus_needs_resume(card->host)) {
 308                 mmc_resume_bus(card->host);
 309                 mmc_blk_set_blksize(md, card);
 310         }
 311 #endif
 312
 313         mmc_claim_host(card->host);
 314
 315         do {
 316             #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
 317                 //struct mmc_command cmd;//Deleted by xbw@2011-03-21
 318                 #else
 319                 struct mmc_command cmd;
 320                 #endif
 321
 322                 u32 readcmd, writecmd, status = 0;
 323
 324                 memset(&brq, 0, sizeof(struct mmc_blk_request));
 325                 brq.mrq.cmd = &brq.cmd;
 326                 brq.mrq.data = &brq.data;
 327
 328                 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
 329                 brq.cmd.retries = 2; //suppot retry read-write; added by xbw@2011-03-21
 330         #endif
 331
 332                 brq.cmd.arg = blk_rq_pos(req);
 333                 if (!mmc_card_blockaddr(card))
 334                         brq.cmd.arg <<= 9;
 335                 brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 336                 brq.data.blksz = 512;
 337                 brq.stop.opcode = MMC_STOP_TRANSMISSION;
 338                 brq.stop.arg = 0;
 339                 brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 340                 brq.data.blocks = blk_rq_sectors(req);
 341
 342                 /*
 343                  * The block layer doesn't support all sector count
 344                  * restrictions, so we need to be prepared for too big
 345                  * requests.
 346                  */
 347                 if (brq.data.blocks > card->host->max_blk_count)
 348                         brq.data.blocks = card->host->max_blk_count;
 349
 350                 /*
 351                  * After a read error, we redo the request one sector at a time
 352                  * in order to accurately determine which sectors can be read
 353                  * successfully.
 354                  */
 355                 if (disable_multi && brq.data.blocks > 1)
 356                         brq.data.blocks = 1;
 357
 358                 if (brq.data.blocks > 1) {
 359                         /* SPI multiblock writes terminate using a special
 360                          * token, not a STOP_TRANSMISSION request.
 361                          */
 362                         if (!mmc_host_is_spi(card->host)
 363                                         || rq_data_dir(req) == READ)
 364                                 brq.mrq.stop = &brq.stop;
 365                         readcmd = MMC_READ_MULTIPLE_BLOCK;
 366                         writecmd = MMC_WRITE_MULTIPLE_BLOCK;
 367                 } else {
 368                         brq.mrq.stop = NULL;
 369                         readcmd = MMC_READ_SINGLE_BLOCK;
 370                         writecmd = MMC_WRITE_BLOCK;
 371                 }
 372
 373                 if (rq_data_dir(req) == READ) {
 374                         brq.cmd.opcode = readcmd;
 375                         brq.data.flags |= MMC_DATA_READ;
 376                 } else {
 377                         brq.cmd.opcode = writecmd;
 378                         brq.data.flags |= MMC_DATA_WRITE;
 379                 }
 380
 381                 mmc_set_data_timeout(&brq.data, card);
 382
 383                 brq.data.sg = mq->sg;
 384                 brq.data.sg_len = mmc_queue_map_sg(mq);
 385
 386                 /*
 387                  * Adjust the sg list so it is the same size as the
 388                  * request.
 389                  */
 390                 if (brq.data.blocks != blk_rq_sectors(req)) {
 391                         int i, data_size = brq.data.blocks << 9;
 392                         struct scatterlist *sg;
 393
 394                         for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
 395                                 data_size -= sg->length;
 396                                 if (data_size <= 0) {
 397                                         sg->length += data_size;
 398                                         i++;
 399                                         break;
 400                                 }
 401                         }
 402                         brq.data.sg_len = i;
 403                 }
 404
 405                 mmc_queue_bounce_pre(mq);
 406
 407                 mmc_wait_for_req(card->host, &brq.mrq);
 408
 409                 mmc_queue_bounce_post(mq);
 410
 411         #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
 412         //not turn CMD18 to CMD17. deleted by xbw at 2011-04-21
 413
 414         #else
 415
 416                 /*
 417                  * Check for errors here, but don't jump to cmd_err
 418                  * until later as we need to wait for the card to leave
 419                  * programming mode even when things go wrong.
 420                  */
 421                 if (brq.cmd.error || brq.data.error || brq.stop.error) {
 422                         if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
 423                                 /* Redo read one sector at a time */
 424                                 printk(KERN_DEBUG "%s: retrying using single "
 425                                        "block read\n", req->rq_disk->disk_name);
 426                                 disable_multi = 1;
 427                                 continue;
 428                         }
 429                         status = get_card_status(card, req);
 430                 } else if (disable_multi == 1) {
 431                         disable_multi = 0;
 432                 }
 433         #endif
 434
 435                 if (brq.cmd.error) {
 436                         printk(KERN_DEBUG "%s: error %d sending read/write "
 437                                "command, response %#x, card status %#x\n",
 438                                req->rq_disk->disk_name, brq.cmd.error,
 439                                brq.cmd.resp[0], status);
 440                 }
 441
 442                 if (brq.data.error) {
 443                         if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
 444                                 /* 'Stop' response contains card status */
 445                                 status = brq.mrq.stop->resp[0];
 446                         printk(KERN_DEBUG "%s: error %d transferring data,"
 447                                " sector %u, nr %u, card status %#x\n",
 448                                req->rq_disk->disk_name, brq.data.error,
 449                                (unsigned)blk_rq_pos(req),
 450                                (unsigned)blk_rq_sectors(req), status);
 451                 }
 452
 453                 if (brq.stop.error) {
 454                         printk(KERN_DEBUG "%s: error %d sending stop command, "
 455                                "response %#x, card status %#x\n",
 456                                req->rq_disk->disk_name, brq.stop.error,
 457                                brq.stop.resp[0], status);
 458                 }
 459
 460  #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
 461  //Deleted by xbw@2011-03-21
 462
 463  #else
 464                 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
 465                         do {
 466                                 int err;
 467
 468                                 cmd.opcode = MMC_SEND_STATUS;
 469                                 cmd.arg = card->rca << 16;
 470                                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 471                                 err = mmc_wait_for_cmd(card->host, &cmd, 5);
 472                                 if (err) {
 473                                         printk(KERN_DEBUG "%s: error %d requesting status\n",
 474                                                req->rq_disk->disk_name, err);
 475                                         goto cmd_err;
 476                                 }
 477                                 /*
 478                                  * Some cards mishandle the status bits,
 479                                  * so make sure to check both the busy
 480                                  * indication and the card state.
 481                                  */
 482                         } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
 483                                 (R1_CURRENT_STATE(cmd.resp[0]) == 7));
 484
 485 #if 0
 486                         if (cmd.resp[0] & ~0x00000900)
 487                                 printk(KERN_ERR "%s: status = %08x\n",
 488                                        req->rq_disk->disk_name, cmd.resp[0]);
 489                         if (mmc_decode_status(cmd.resp))
 490                                 goto cmd_err;
 491 #endif
 492                 }
 493 #endif
 494
 495                 if (brq.cmd.error || brq.stop.error || brq.data.error) {
 496                         if (rq_data_dir(req) == READ) {
 497                                 /*
 498                                  * After an error, we redo I/O one sector at a
 499                                  * time, so we only reach here after trying to
 500                                  * read a single sector.
 501                                  */
 502                                 spin_lock_irq(&md->lock);
 503                                 ret = __blk_end_request(req, -EIO, brq.data.blksz);
 504                                 spin_unlock_irq(&md->lock);
 505                                 continue;
 506                         }
 507                         goto cmd_err;
 508                 }
 509
 510                 /*
 511                  * A block was successfully transferred.
 512                  */
 513                 spin_lock_irq(&md->lock);
 514                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 515                 spin_unlock_irq(&md->lock);
 516         } while (ret);
 517
 518         mmc_release_host(card->host);
 519
 520         return 1;
 521
 522  cmd_err:
 523         /*
 524          * If this is an SD card and we're writing, we can first
 525          * mark the known good sectors as ok.
 526          *
 527          * If the card is not SD, we can still ok written sectors
 528          * as reported by the controller (which might be less than
 529          * the real number of written sectors, but never more).
 530          */
 531         if (mmc_card_sd(card)) {
 532                 u32 blocks;
 533
 534                 blocks = mmc_sd_num_wr_blocks(card);
 535                 if (blocks != (u32)-1) {
 536                         spin_lock_irq(&md->lock);
 537                         ret = __blk_end_request(req, 0, blocks << 9);
 538                         spin_unlock_irq(&md->lock);
 539                 }
 540         } else {
 541                 spin_lock_irq(&md->lock);
 542                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 543                 spin_unlock_irq(&md->lock);
 544         }
 545
 546         mmc_release_host(card->host);
 547
 548         spin_lock_irq(&md->lock);
 549         while (ret)
 550                 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
 551         spin_unlock_irq(&md->lock);
 552
 553         return 0;
 554 }
 555
 556
 557 static inline int mmc_blk_readonly(struct mmc_card *card)
 558 {
 559         return mmc_card_readonly(card) ||
 560                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
 561 }
 562
 563 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
 564 {
 565         struct mmc_blk_data *md;
 566         int devidx, ret;
 567
 568         devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
 569         if (devidx >= MMC_NUM_MINORS)
 570                 return ERR_PTR(-ENOSPC);
 571         __set_bit(devidx, dev_use);
 572
 573         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
 574         if (!md) {
 575                 ret = -ENOMEM;
 576                 goto out;
 577         }
 578
 579
 580         /*
 581          * Set the read-only status based on the supported commands
 582          * and the write protect switch.
 583          */
 584         md->read_only = mmc_blk_readonly(card);
 585
 586         md->disk = alloc_disk(1 << MMC_SHIFT);
 587         if (md->disk == NULL) {
 588                 ret = -ENOMEM;
 589                 goto err_kfree;
 590         }
 591
 592         spin_lock_init(&md->lock);
 593         md->usage = 1;
 594
 595         ret = mmc_init_queue(&md->queue, card, &md->lock);
 596         if (ret)
 597                 goto err_putdisk;
 598
 599         md->queue.issue_fn = mmc_blk_issue_rq;
 600         md->queue.data = md;
 601
 602         md->disk->major = MMC_BLOCK_MAJOR;
 603         md->disk->first_minor = devidx << MMC_SHIFT;
 604         md->disk->fops = &mmc_bdops;
 605         md->disk->private_data = md;
 606         md->disk->queue = md->queue.queue;
 607         md->disk->driverfs_dev = &card->dev;
 608
 609         /*
 610          * As discussed on lkml, GENHD_FL_REMOVABLE should:
 611          *
 612          * - be set for removable media with permanent block devices
 613          * - be unset for removable block devices with permanent media
 614          *
 615          * Since MMC block devices clearly fall under the second
 616          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
 617          * should use the block device creation/destruction hotplug
 618          * messages to tell when the card is present.
 619          */
 620
 621         sprintf(md->disk->disk_name, "mmcblk%d", devidx);
 622
 623 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
 624         printk("%s..%d **** devidx=%d, dev_use[0]=%lu, disk_name=%s *** ==xbw[%s]==\n",\
 625             __FUNCTION__,__LINE__, devidx, dev_use[0], md->disk->disk_name,mmc_hostname(card->host));
 626 #endif
 627
 628         blk_queue_logical_block_size(md->queue.queue, 512);
 629
 630         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
 631                 /*
 632                  * The EXT_CSD sector count is in number or 512 byte
 633                  * sectors.
 634                  */
 635                 set_capacity(md->disk, card->ext_csd.sectors);
 636         } else {
 637                 /*
 638                  * The CSD capacity field is in units of read_blkbits.
 639                  * set_capacity takes units of 512 bytes.
 640                  */
 641                 set_capacity(md->disk,
 642                         card->csd.capacity << (card->csd.read_blkbits - 9));
 643         }
 644         return md;
 645
 646  err_putdisk:
 647         put_disk(md->disk);
 648  err_kfree:
 649         kfree(md);
 650  out:
 651         return ERR_PTR(ret);
 652 }
 653
 654 static int mmc_blk_probe(struct mmc_card *card)
 655 {
 656         struct mmc_blk_data *md;
 657         int err;
 658
 659         char cap_str[10];
 660
 661         /*
 662          * Check that the card supports the command class(es) we need.
 663          */
 664         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
 665                 return -ENODEV;
 666
 667         md = mmc_blk_alloc(card);
 668         if (IS_ERR(md))
 669                 return PTR_ERR(md);
 670
 671         err = mmc_blk_set_blksize(md, card);
 672         if (err)
 673                 goto out;
 674
 675         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
 676                         cap_str, sizeof(cap_str));
 677         printk(KERN_INFO "%s: %s %s %s %s\n",
 678                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
 679                 cap_str, md->read_only ? "(ro)" : "");
 680
 681         mmc_set_drvdata(card, md);
 682 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 683         mmc_set_bus_resume_policy(card->host, 1);
 684 #endif
 685         add_disk(md->disk);
 686         return 0;
 687
 688  out:
 689         mmc_cleanup_queue(&md->queue);
 690         mmc_blk_put(md);
 691
 692         return err;
 693 }
 694
 695 static void mmc_blk_remove(struct mmc_card *card)
 696 {
 697         struct mmc_blk_data *md = mmc_get_drvdata(card);
 698
 699         if (md) {
 700                 /* Stop new requests from getting into the queue */
 701                 del_gendisk(md->disk);
 702
 703                 /* Then flush out any already in there */
 704                 mmc_cleanup_queue(&md->queue);
 705
 706                 mmc_blk_put(md);
 707         }
 708         mmc_set_drvdata(card, NULL);
 709 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 710         mmc_set_bus_resume_policy(card->host, 0);
 711 #endif
 712 }
 713
 714 #ifdef CONFIG_PM
 715 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
 716 {
 717         struct mmc_blk_data *md = mmc_get_drvdata(card);
 718
 719         if (md) {
 720                 mmc_queue_suspend(&md->queue);
 721         }
 722         return 0;
 723 }
 724
 725 static int mmc_blk_resume(struct mmc_card *card)
 726 {
 727         struct mmc_blk_data *md = mmc_get_drvdata(card);
 728
 729         if (md) {
 730 #ifndef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 731                 mmc_blk_set_blksize(md, card);
 732 #endif
 733                 mmc_queue_resume(&md->queue);
 734         }
 735         return 0;
 736 }
 737 #else
 738 #define mmc_blk_suspend NULL
 739 #define mmc_blk_resume  NULL
 740 #endif
 741
 742 static struct mmc_driver mmc_driver = {
 743         .drv            = {
 744                 .name   = "mmcblk",
 745         },
 746         .probe          = mmc_blk_probe,
 747         .remove         = mmc_blk_remove,
 748         .suspend        = mmc_blk_suspend,
 749         .resume         = mmc_blk_resume,
 750 };
 751
 752 static int __init mmc_blk_init(void)
 753 {
 754         int res;
 755
 756         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
 757         if (res)
 758                 goto out;
 759
 760         res = mmc_register_driver(&mmc_driver);
 761         if (res)
 762                 goto out2;
 763
 764         return 0;
 765  out2:
 766         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 767  out:
 768         return res;
 769 }
 770
 771 static void __exit mmc_blk_exit(void)
 772 {
 773         mmc_unregister_driver(&mmc_driver);
 774         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 775 }
 776
 777 module_init(mmc_blk_init);
 778 module_exit(mmc_blk_exit);
 779
 780 MODULE_LICENSE("GPL");
 781 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
 782