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/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34
  35 #include <linux/mmc/card.h>
  36 #include <linux/mmc/host.h>
  37 #include <linux/mmc/mmc.h>
  38 #include <linux/mmc/sd.h>
  39
  40 #include <asm/system.h>
  41 #include <asm/uaccess.h>
  42
  43 #include "queue.h"
  44
  45 MODULE_ALIAS("mmc:block");
  46 #ifdef MODULE_PARAM_PREFIX
  47 #undef MODULE_PARAM_PREFIX
  48 #endif
  49 #define MODULE_PARAM_PREFIX "mmcblk."
  50
  51 static DEFINE_MUTEX(block_mutex);
  52
  53 /*
  54  * The defaults come from config options but can be overriden by module
  55  * or bootarg options.
  56  */
  57 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  58
  59 /*
  60  * We've only got one major, so number of mmcblk devices is
  61  * limited to 256 / number of minors per device.
  62  */
  63 static int max_devices;
  64
  65 /* 256 minors, so at most 256 separate devices */
  66 static DECLARE_BITMAP(dev_use, 256);
  67
  68 /*
  69  * There is one mmc_blk_data per slot.
  70  */
  71 struct mmc_blk_data {
  72         spinlock_t      lock;
  73         struct gendisk  *disk;
  74         struct mmc_queue queue;
  75
  76         unsigned int    usage;
  77         unsigned int    read_only;
  78 };
  79
  80 static DEFINE_MUTEX(open_lock);
  81
  82 module_param(perdev_minors, int, 0444);
  83 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
  84
  85 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
  86 {
  87         struct mmc_blk_data *md;
  88
  89         mutex_lock(&open_lock);
  90         md = disk->private_data;
  91         if (md && md->usage == 0)
  92                 md = NULL;
  93         if (md)
  94                 md->usage++;
  95         mutex_unlock(&open_lock);
  96
  97         return md;
  98 }
  99
 100 static void mmc_blk_put(struct mmc_blk_data *md)
 101 {
 102         mutex_lock(&open_lock);
 103         md->usage--;
 104         if (md->usage == 0) {
 105                 int devmaj = MAJOR(disk_devt(md->disk));
 106                 int devidx = MINOR(disk_devt(md->disk)) / perdev_minors;
 107
 108                 if (!devmaj)
 109                         devidx = md->disk->first_minor / perdev_minors;
 110
 111                 blk_cleanup_queue(md->queue.queue);
 112
 113                 __clear_bit(devidx, dev_use);
 114
 115                 put_disk(md->disk);
 116                 kfree(md);
 117         }
 118         mutex_unlock(&open_lock);
 119 }
 120
 121 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 122 {
 123         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 124         int ret = -ENXIO;
 125
 126         mutex_lock(&block_mutex);
 127         if (md) {
 128                 if (md->usage == 2)
 129                         check_disk_change(bdev);
 130                 ret = 0;
 131
 132                 if ((mode & FMODE_WRITE) && md->read_only) {
 133                         mmc_blk_put(md);
 134                         ret = -EROFS;
 135                 }
 136         }
 137         mutex_unlock(&block_mutex);
 138
 139         return ret;
 140 }
 141
 142 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
 143 {
 144         struct mmc_blk_data *md = disk->private_data;
 145
 146         mutex_lock(&block_mutex);
 147         mmc_blk_put(md);
 148         mutex_unlock(&block_mutex);
 149         return 0;
 150 }
 151
 152 static int
 153 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 154 {
 155         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 156         geo->heads = 4;
 157         geo->sectors = 16;
 158         return 0;
 159 }
 160
 161 static const struct block_device_operations mmc_bdops = {
 162         .open                   = mmc_blk_open,
 163         .release                = mmc_blk_release,
 164         .getgeo                 = mmc_blk_getgeo,
 165         .owner                  = THIS_MODULE,
 166 };
 167
 168 struct mmc_blk_request {
 169         struct mmc_request      mrq;
 170         struct mmc_command      cmd;
 171         struct mmc_command      stop;
 172         struct mmc_data         data;
 173 };
 174
 175 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 176 {
 177         int err;
 178         u32 result;
 179         __be32 *blocks;
 180
 181         struct mmc_request mrq;
 182         struct mmc_command cmd;
 183         struct mmc_data data;
 184         unsigned int timeout_us;
 185
 186         struct scatterlist sg;
 187
 188         memset(&cmd, 0, sizeof(struct mmc_command));
 189
 190         cmd.opcode = MMC_APP_CMD;
 191         cmd.arg = card->rca << 16;
 192         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 193
 194         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 195         if (err)
 196                 return (u32)-1;
 197         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 198                 return (u32)-1;
 199
 200         memset(&cmd, 0, sizeof(struct mmc_command));
 201
 202         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 203         cmd.arg = 0;
 204         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 205
 206         memset(&data, 0, sizeof(struct mmc_data));
 207
 208         data.timeout_ns = card->csd.tacc_ns * 100;
 209         data.timeout_clks = card->csd.tacc_clks * 100;
 210
 211         timeout_us = data.timeout_ns / 1000;
 212         timeout_us += data.timeout_clks * 1000 /
 213                 (card->host->ios.clock / 1000);
 214
 215         if (timeout_us > 100000) {
 216                 data.timeout_ns = 100000000;
 217                 data.timeout_clks = 0;
 218         }
 219
 220         data.blksz = 4;
 221         data.blocks = 1;
 222         data.flags = MMC_DATA_READ;
 223         data.sg = &sg;
 224         data.sg_len = 1;
 225
 226         memset(&mrq, 0, sizeof(struct mmc_request));
 227
 228         mrq.cmd = &cmd;
 229         mrq.data = &data;
 230
 231         blocks = kmalloc(4, GFP_KERNEL);
 232         if (!blocks)
 233                 return (u32)-1;
 234
 235         sg_init_one(&sg, blocks, 4);
 236
 237         mmc_wait_for_req(card->host, &mrq);
 238
 239         result = ntohl(*blocks);
 240         kfree(blocks);
 241
 242         if (cmd.error || data.error)
 243                 result = (u32)-1;
 244
 245         return result;
 246 }
 247
 248 static u32 get_card_status(struct mmc_card *card, struct request *req)
 249 {
 250         struct mmc_command cmd;
 251         int err;
 252
 253         memset(&cmd, 0, sizeof(struct mmc_command));
 254         cmd.opcode = MMC_SEND_STATUS;
 255         if (!mmc_host_is_spi(card->host))
 256                 cmd.arg = card->rca << 16;
 257         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 258         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 259         if (err)
 260                 printk(KERN_ERR "%s: error %d sending status command",
 261                        req->rq_disk->disk_name, err);
 262         return cmd.resp[0];
 263 }
 264
 265 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
 266 {
 267         struct mmc_blk_data *md = mq->data;
 268         struct mmc_card *card = md->queue.card;
 269         unsigned int from, nr, arg;
 270         int err = 0;
 271
 272         mmc_claim_host(card->host);
 273
 274         if (!mmc_can_erase(card)) {
 275                 err = -EOPNOTSUPP;
 276                 goto out;
 277         }
 278
 279         from = blk_rq_pos(req);
 280         nr = blk_rq_sectors(req);
 281
 282         if (mmc_can_trim(card))
 283                 arg = MMC_TRIM_ARG;
 284         else
 285                 arg = MMC_ERASE_ARG;
 286
 287         err = mmc_erase(card, from, nr, arg);
 288 out:
 289         spin_lock_irq(&md->lock);
 290         __blk_end_request(req, err, blk_rq_bytes(req));
 291         spin_unlock_irq(&md->lock);
 292
 293         mmc_release_host(card->host);
 294
 295         return err ? 0 : 1;
 296 }
 297
 298 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
 299                                        struct request *req)
 300 {
 301         struct mmc_blk_data *md = mq->data;
 302         struct mmc_card *card = md->queue.card;
 303         unsigned int from, nr, arg;
 304         int err = 0;
 305
 306         mmc_claim_host(card->host);
 307
 308         if (!mmc_can_secure_erase_trim(card)) {
 309                 err = -EOPNOTSUPP;
 310                 goto out;
 311         }
 312
 313         from = blk_rq_pos(req);
 314         nr = blk_rq_sectors(req);
 315
 316         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
 317                 arg = MMC_SECURE_TRIM1_ARG;
 318         else
 319                 arg = MMC_SECURE_ERASE_ARG;
 320
 321         err = mmc_erase(card, from, nr, arg);
 322         if (!err && arg == MMC_SECURE_TRIM1_ARG)
 323                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
 324 out:
 325         spin_lock_irq(&md->lock);
 326         __blk_end_request(req, err, blk_rq_bytes(req));
 327         spin_unlock_irq(&md->lock);
 328
 329         mmc_release_host(card->host);
 330
 331         return err ? 0 : 1;
 332 }
 333
 334 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
 335 {
 336         struct mmc_blk_data *md = mq->data;
 337         struct mmc_card *card = md->queue.card;
 338         struct mmc_blk_request brq;
 339         int ret = 1, disable_multi = 0;
 340
 341         mmc_claim_host(card->host);
 342
 343         do {
 344                 struct mmc_command cmd;
 345                 u32 readcmd, writecmd, status = 0;
 346
 347                 memset(&brq, 0, sizeof(struct mmc_blk_request));
 348                 brq.mrq.cmd = &brq.cmd;
 349                 brq.mrq.data = &brq.data;
 350
 351                 brq.cmd.arg = blk_rq_pos(req);
 352                 if (!mmc_card_blockaddr(card))
 353                         brq.cmd.arg <<= 9;
 354                 brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 355                 brq.data.blksz = 512;
 356                 brq.stop.opcode = MMC_STOP_TRANSMISSION;
 357                 brq.stop.arg = 0;
 358                 brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 359                 brq.data.blocks = blk_rq_sectors(req);
 360
 361                 /*
 362                  * The block layer doesn't support all sector count
 363                  * restrictions, so we need to be prepared for too big
 364                  * requests.
 365                  */
 366                 if (brq.data.blocks > card->host->max_blk_count)
 367                         brq.data.blocks = card->host->max_blk_count;
 368
 369                 /*
 370                  * After a read error, we redo the request one sector at a time
 371                  * in order to accurately determine which sectors can be read
 372                  * successfully.
 373                  */
 374                 if (disable_multi && brq.data.blocks > 1)
 375                         brq.data.blocks = 1;
 376
 377                 if (brq.data.blocks > 1) {
 378                         /* SPI multiblock writes terminate using a special
 379                          * token, not a STOP_TRANSMISSION request.
 380                          */
 381                         if (!mmc_host_is_spi(card->host)
 382                                         || rq_data_dir(req) == READ)
 383                                 brq.mrq.stop = &brq.stop;
 384                         readcmd = MMC_READ_MULTIPLE_BLOCK;
 385                         writecmd = MMC_WRITE_MULTIPLE_BLOCK;
 386                 } else {
 387                         brq.mrq.stop = NULL;
 388                         readcmd = MMC_READ_SINGLE_BLOCK;
 389                         writecmd = MMC_WRITE_BLOCK;
 390                 }
 391                 if (rq_data_dir(req) == READ) {
 392                         brq.cmd.opcode = readcmd;
 393                         brq.data.flags |= MMC_DATA_READ;
 394                 } else {
 395                         brq.cmd.opcode = writecmd;
 396                         brq.data.flags |= MMC_DATA_WRITE;
 397                 }
 398
 399                 mmc_set_data_timeout(&brq.data, card);
 400
 401                 brq.data.sg = mq->sg;
 402                 brq.data.sg_len = mmc_queue_map_sg(mq);
 403
 404                 /*
 405                  * Adjust the sg list so it is the same size as the
 406                  * request.
 407                  */
 408                 if (brq.data.blocks != blk_rq_sectors(req)) {
 409                         int i, data_size = brq.data.blocks << 9;
 410                         struct scatterlist *sg;
 411
 412                         for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
 413                                 data_size -= sg->length;
 414                                 if (data_size <= 0) {
 415                                         sg->length += data_size;
 416                                         i++;
 417                                         break;
 418                                 }
 419                         }
 420                         brq.data.sg_len = i;
 421                 }
 422
 423                 mmc_queue_bounce_pre(mq);
 424
 425                 mmc_wait_for_req(card->host, &brq.mrq);
 426
 427                 mmc_queue_bounce_post(mq);
 428
 429                 /*
 430                  * Check for errors here, but don't jump to cmd_err
 431                  * until later as we need to wait for the card to leave
 432                  * programming mode even when things go wrong.
 433                  */
 434                 if (brq.cmd.error || brq.data.error || brq.stop.error) {
 435                         if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
 436                                 /* Redo read one sector at a time */
 437                                 printk(KERN_WARNING "%s: retrying using single "
 438                                        "block read\n", req->rq_disk->disk_name);
 439                                 disable_multi = 1;
 440                                 continue;
 441                         }
 442                         status = get_card_status(card, req);
 443                 }
 444
 445                 if (brq.cmd.error) {
 446                         printk(KERN_ERR "%s: error %d sending read/write "
 447                                "command, response %#x, card status %#x\n",
 448                                req->rq_disk->disk_name, brq.cmd.error,
 449                                brq.cmd.resp[0], status);
 450                 }
 451
 452                 if (brq.data.error) {
 453                         if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
 454                                 /* 'Stop' response contains card status */
 455                                 status = brq.mrq.stop->resp[0];
 456                         printk(KERN_ERR "%s: error %d transferring data,"
 457                                " sector %u, nr %u, card status %#x\n",
 458                                req->rq_disk->disk_name, brq.data.error,
 459                                (unsigned)blk_rq_pos(req),
 460                                (unsigned)blk_rq_sectors(req), status);
 461                 }
 462
 463                 if (brq.stop.error) {
 464                         printk(KERN_ERR "%s: error %d sending stop command, "
 465                                "response %#x, card status %#x\n",
 466                                req->rq_disk->disk_name, brq.stop.error,
 467                                brq.stop.resp[0], status);
 468                 }
 469
 470                 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
 471                         do {
 472                                 int err;
 473
 474                                 cmd.opcode = MMC_SEND_STATUS;
 475                                 cmd.arg = card->rca << 16;
 476                                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 477                                 err = mmc_wait_for_cmd(card->host, &cmd, 5);
 478                                 if (err) {
 479                                         printk(KERN_ERR "%s: error %d requesting status\n",
 480                                                req->rq_disk->disk_name, err);
 481                                         goto cmd_err;
 482                                 }
 483                                 /*
 484                                  * Some cards mishandle the status bits,
 485                                  * so make sure to check both the busy
 486                                  * indication and the card state.
 487                                  */
 488                         } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
 489                                 (R1_CURRENT_STATE(cmd.resp[0]) == 7));
 490
 491 #if 0
 492                         if (cmd.resp[0] & ~0x00000900)
 493                                 printk(KERN_ERR "%s: status = %08x\n",
 494                                        req->rq_disk->disk_name, cmd.resp[0]);
 495                         if (mmc_decode_status(cmd.resp))
 496                                 goto cmd_err;
 497 #endif
 498                 }
 499
 500                 if (brq.cmd.error || brq.stop.error || brq.data.error) {
 501                         if (rq_data_dir(req) == READ) {
 502                                 /*
 503                                  * After an error, we redo I/O one sector at a
 504                                  * time, so we only reach here after trying to
 505                                  * read a single sector.
 506                                  */
 507                                 spin_lock_irq(&md->lock);
 508                                 ret = __blk_end_request(req, -EIO, brq.data.blksz);
 509                                 spin_unlock_irq(&md->lock);
 510                                 continue;
 511                         }
 512                         goto cmd_err;
 513                 }
 514
 515                 /*
 516                  * A block was successfully transferred.
 517                  */
 518                 spin_lock_irq(&md->lock);
 519                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 520                 spin_unlock_irq(&md->lock);
 521         } while (ret);
 522
 523         mmc_release_host(card->host);
 524
 525         return 1;
 526
 527  cmd_err:
 528         /*
 529          * If this is an SD card and we're writing, we can first
 530          * mark the known good sectors as ok.
 531          *
 532          * If the card is not SD, we can still ok written sectors
 533          * as reported by the controller (which might be less than
 534          * the real number of written sectors, but never more).
 535          */
 536         if (mmc_card_sd(card)) {
 537                 u32 blocks;
 538
 539                 blocks = mmc_sd_num_wr_blocks(card);
 540                 if (blocks != (u32)-1) {
 541                         spin_lock_irq(&md->lock);
 542                         ret = __blk_end_request(req, 0, blocks << 9);
 543                         spin_unlock_irq(&md->lock);
 544                 }
 545         } else {
 546                 spin_lock_irq(&md->lock);
 547                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 548                 spin_unlock_irq(&md->lock);
 549         }
 550
 551         mmc_release_host(card->host);
 552
 553         spin_lock_irq(&md->lock);
 554         while (ret)
 555                 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
 556         spin_unlock_irq(&md->lock);
 557
 558         return 0;
 559 }
 560
 561 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 562 {
 563         if (req->cmd_flags & REQ_DISCARD) {
 564                 if (req->cmd_flags & REQ_SECURE)
 565                         return mmc_blk_issue_secdiscard_rq(mq, req);
 566                 else
 567                         return mmc_blk_issue_discard_rq(mq, req);
 568         } else {
 569                 return mmc_blk_issue_rw_rq(mq, req);
 570         }
 571 }
 572
 573 static inline int mmc_blk_readonly(struct mmc_card *card)
 574 {
 575         return mmc_card_readonly(card) ||
 576                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
 577 }
 578
 579 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
 580 {
 581         struct mmc_blk_data *md;
 582         int devidx, ret;
 583
 584         devidx = find_first_zero_bit(dev_use, max_devices);
 585         if (devidx >= max_devices)
 586                 return ERR_PTR(-ENOSPC);
 587         __set_bit(devidx, dev_use);
 588
 589         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
 590         if (!md) {
 591                 ret = -ENOMEM;
 592                 goto out;
 593         }
 594
 595
 596         /*
 597          * Set the read-only status based on the supported commands
 598          * and the write protect switch.
 599          */
 600         md->read_only = mmc_blk_readonly(card);
 601
 602         md->disk = alloc_disk(perdev_minors);
 603         if (md->disk == NULL) {
 604                 ret = -ENOMEM;
 605                 goto err_kfree;
 606         }
 607
 608         spin_lock_init(&md->lock);
 609         md->usage = 1;
 610
 611         ret = mmc_init_queue(&md->queue, card, &md->lock);
 612         if (ret)
 613                 goto err_putdisk;
 614
 615         md->queue.issue_fn = mmc_blk_issue_rq;
 616         md->queue.data = md;
 617
 618         md->disk->major = MMC_BLOCK_MAJOR;
 619         md->disk->first_minor = devidx * perdev_minors;
 620         md->disk->fops = &mmc_bdops;
 621         md->disk->private_data = md;
 622         md->disk->queue = md->queue.queue;
 623         md->disk->driverfs_dev = &card->dev;
 624
 625         /*
 626          * As discussed on lkml, GENHD_FL_REMOVABLE should:
 627          *
 628          * - be set for removable media with permanent block devices
 629          * - be unset for removable block devices with permanent media
 630          *
 631          * Since MMC block devices clearly fall under the second
 632          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
 633          * should use the block device creation/destruction hotplug
 634          * messages to tell when the card is present.
 635          */
 636
 637         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
 638                 "mmcblk%d", devidx);
 639
 640         blk_queue_logical_block_size(md->queue.queue, 512);
 641
 642         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
 643                 /*
 644                  * The EXT_CSD sector count is in number or 512 byte
 645                  * sectors.
 646                  */
 647                 set_capacity(md->disk, card->ext_csd.sectors);
 648         } else {
 649                 /*
 650                  * The CSD capacity field is in units of read_blkbits.
 651                  * set_capacity takes units of 512 bytes.
 652                  */
 653                 set_capacity(md->disk,
 654                         card->csd.capacity << (card->csd.read_blkbits - 9));
 655         }
 656         return md;
 657
 658  err_putdisk:
 659         put_disk(md->disk);
 660  err_kfree:
 661         kfree(md);
 662  out:
 663         return ERR_PTR(ret);
 664 }
 665
 666 static int
 667 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
 668 {
 669         int err;
 670
 671         mmc_claim_host(card->host);
 672         err = mmc_set_blocklen(card, 512);
 673         mmc_release_host(card->host);
 674
 675         if (err) {
 676                 printk(KERN_ERR "%s: unable to set block size to 512: %d\n",
 677                         md->disk->disk_name, err);
 678                 return -EINVAL;
 679         }
 680
 681         return 0;
 682 }
 683
 684 static int mmc_blk_probe(struct mmc_card *card)
 685 {
 686         struct mmc_blk_data *md;
 687         int err;
 688         char cap_str[10];
 689
 690         /*
 691          * Check that the card supports the command class(es) we need.
 692          */
 693         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
 694                 return -ENODEV;
 695
 696         md = mmc_blk_alloc(card);
 697         if (IS_ERR(md))
 698                 return PTR_ERR(md);
 699
 700         err = mmc_blk_set_blksize(md, card);
 701         if (err)
 702                 goto out;
 703
 704         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
 705                         cap_str, sizeof(cap_str));
 706         printk(KERN_INFO "%s: %s %s %s %s\n",
 707                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
 708                 cap_str, md->read_only ? "(ro)" : "");
 709
 710         mmc_set_drvdata(card, md);
 711         add_disk(md->disk);
 712         return 0;
 713
 714  out:
 715         mmc_cleanup_queue(&md->queue);
 716         mmc_blk_put(md);
 717
 718         return err;
 719 }
 720
 721 static void mmc_blk_remove(struct mmc_card *card)
 722 {
 723         struct mmc_blk_data *md = mmc_get_drvdata(card);
 724
 725         if (md) {
 726                 /* Stop new requests from getting into the queue */
 727                 del_gendisk(md->disk);
 728
 729                 /* Then flush out any already in there */
 730                 mmc_cleanup_queue(&md->queue);
 731
 732                 mmc_blk_put(md);
 733         }
 734         mmc_set_drvdata(card, NULL);
 735 }
 736
 737 #ifdef CONFIG_PM
 738 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
 739 {
 740         struct mmc_blk_data *md = mmc_get_drvdata(card);
 741
 742         if (md) {
 743                 mmc_queue_suspend(&md->queue);
 744         }
 745         return 0;
 746 }
 747
 748 static int mmc_blk_resume(struct mmc_card *card)
 749 {
 750         struct mmc_blk_data *md = mmc_get_drvdata(card);
 751
 752         if (md) {
 753                 mmc_blk_set_blksize(md, card);
 754                 mmc_queue_resume(&md->queue);
 755         }
 756         return 0;
 757 }
 758 #else
 759 #define mmc_blk_suspend NULL
 760 #define mmc_blk_resume  NULL
 761 #endif
 762
 763 static struct mmc_driver mmc_driver = {
 764         .drv            = {
 765                 .name   = "mmcblk",
 766         },
 767         .probe          = mmc_blk_probe,
 768         .remove         = mmc_blk_remove,
 769         .suspend        = mmc_blk_suspend,
 770         .resume         = mmc_blk_resume,
 771 };
 772
 773 static int __init mmc_blk_init(void)
 774 {
 775         int res;
 776
 777         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
 778                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
 779
 780         max_devices = 256 / perdev_minors;
 781
 782         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
 783         if (res)
 784                 goto out;
 785
 786         res = mmc_register_driver(&mmc_driver);
 787         if (res)
 788                 goto out2;
 789
 790         return 0;
 791  out2:
 792         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 793  out:
 794         return res;
 795 }
 796
 797 static void __exit mmc_blk_exit(void)
 798 {
 799         mmc_unregister_driver(&mmc_driver);
 800         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 801 }
 802
 803 module_init(mmc_blk_init);
 804 module_exit(mmc_blk_exit);
 805
 806 MODULE_LICENSE("GPL");
 807 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
 808