drivers/mmc.old/mmc_block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  *
   6  * Use consistent with the GNU GPL is permitted,
   7  * provided that this copyright notice is
   8  * preserved in its entirety in all copies and derived works.
   9  *
  10  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  11  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  12  * FITNESS FOR ANY PARTICULAR PURPOSE.
  13  *
  14  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  15  *
  16  * Author:  Andrew Christian
  17  *          28 May 2002
  18  */
  19 #include <linux/moduleparam.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22
  23 #include <linux/sched.h>
  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/devfs_fs_kernel.h>
  31
  32 #include <linux/mmc/card.h>
  33 #include <linux/mmc/protocol.h>
  34
  35 #include <asm/system.h>
  36 #include <asm/uaccess.h>
  37
  38 #include "mmc_queue.h"
  39
  40 #if ( defined CONFIG_ARCH_W341 ) || (defined CONFIG_ARCH_W345 ) || ( defined CONFIG_ARCH_W345_IMP1 )
  41 #include <asm/arch/gpio.h>
  42 #endif
  43 /*
  44  * max 8 partitions per card
  45  */
  46 #define MMC_SHIFT       3
  47
  48 #if 0   // mask by Victor Yu. 11-28-2005
  49 static int major;
  50 #else
  51 static int major=121;
  52 #endif
  53
  54 #if ( defined CONFIG_ARCH_W341 ) || (defined CONFIG_ARCH_W345 ) || (defined CONFIG_ARCH_W345_IMP1 )
  55 #define SD_LED ( 1 << 19 )
  56 #endif
  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    block_bits;
  68 };
  69
  70 static DECLARE_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         down(&open_lock);
  77         md = disk->private_data;
  78         if (md && md->usage == 0)
  79                 md = NULL;
  80         if (md)
  81                 md->usage++;
  82         up(&open_lock);
  83
  84         return md;
  85 }
  86
  87 static void mmc_blk_put(struct mmc_blk_data *md)
  88 {
  89         down(&open_lock);
  90         md->usage--;
  91         if (md->usage == 0) {
  92                 put_disk(md->disk);
  93                 mmc_cleanup_queue(&md->queue);
  94                 kfree(md);
  95         }
  96         up(&open_lock);
  97 }
  98
  99 static int mmc_blk_open(struct inode *inode, struct file *filp)
 100 {
 101         struct mmc_blk_data *md;
 102         int ret = -ENXIO;
 103
 104         md = mmc_blk_get(inode->i_bdev->bd_disk);
 105         if (md) {
 106                 if (md->usage == 2)
 107                         check_disk_change(inode->i_bdev);
 108                 ret = 0;
 109
 110                 if ((filp->f_mode & FMODE_WRITE) &&
 111                         mmc_card_readonly(md->queue.card))
 112                         ret = -EROFS;
 113         }
 114
 115         return ret;
 116 }
 117
 118 static int mmc_blk_release(struct inode *inode, struct file *filp)
 119 {
 120         struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data;
 121
 122         mmc_blk_put(md);
 123         return 0;
 124 }
 125
 126 static int
 127 mmc_blk_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
 128 {
 129         struct block_device *bdev = inode->i_bdev;
 130
 131         if (cmd == HDIO_GETGEO) {
 132                 struct hd_geometry geo;
 133
 134                 memset(&geo, 0, sizeof(struct hd_geometry));
 135
 136                 geo.cylinders   = get_capacity(bdev->bd_disk) / (4 * 16);
 137                 geo.heads       = 4;
 138                 geo.sectors     = 16;
 139                 geo.start       = get_start_sect(bdev);
 140
 141                 return copy_to_user((void __user *)arg, &geo, sizeof(geo))
 142                         ? -EFAULT : 0;
 143         }
 144
 145         return -ENOTTY;
 146 }
 147
 148 static struct block_device_operations mmc_bdops = {
 149         .open                   = mmc_blk_open,
 150         .release                = mmc_blk_release,
 151         .ioctl                  = mmc_blk_ioctl,
 152         .owner                  = THIS_MODULE,
 153 };
 154
 155 struct mmc_blk_request {
 156         struct mmc_request      mrq;
 157         struct mmc_command      cmd;
 158         struct mmc_command      stop;
 159         struct mmc_data         data;
 160 };
 161
 162 static int mmc_blk_prep_rq(struct mmc_queue *mq, struct request *req)
 163 {
 164         struct mmc_blk_data *md = mq->data;
 165         int stat = BLKPREP_OK;
 166
 167         /*
 168          * If we have no device, we haven't finished initialising.
 169          */
 170         if (!md || !mq->card) {
 171                 printk(KERN_ERR "%s: killing request - no device/host\n",
 172                        req->rq_disk->disk_name);
 173                 stat = BLKPREP_KILL;
 174         }
 175
 176         return stat;
 177 }
 178
 179 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 180 {
 181         struct mmc_blk_data *md = mq->data;
 182         struct mmc_card *card = md->queue.card;
 183         int ret;
 184
 185         if (mmc_card_claim_host(card))
 186                 goto cmd_err;
 187
 188         do {
 189                 struct mmc_blk_request brq;
 190                 struct mmc_command cmd;
 191
 192                 memset(&brq, 0, sizeof(struct mmc_blk_request));
 193                 brq.mrq.cmd = &brq.cmd;
 194                 brq.mrq.data = &brq.data;
 195
 196                 brq.cmd.arg = req->sector << 9;
 197                 brq.cmd.flags = MMC_RSP_R1;
 198                 brq.data.timeout_ns = card->csd.tacc_ns * 10;
 199                 brq.data.timeout_clks = card->csd.tacc_clks * 10;
 200                 brq.data.blksz_bits = md->block_bits;
 201                 brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
 202                 brq.stop.opcode = MMC_STOP_TRANSMISSION;
 203                 brq.stop.arg = 0;
 204                 brq.stop.flags = MMC_RSP_R1B;
 205
 206                 if (rq_data_dir(req) == READ) {
 207                         brq.cmd.opcode = brq.data.blocks > 1 ? MMC_READ_MULTIPLE_BLOCK : MMC_READ_SINGLE_BLOCK;
 208                         brq.data.flags |= MMC_DATA_READ;
 209                 } else {
 210                         brq.cmd.opcode = MMC_WRITE_BLOCK;
 211                         brq.cmd.flags = MMC_RSP_R1B;
 212                         brq.data.flags |= MMC_DATA_WRITE;
 213                         brq.data.blocks = 1;
 214                 }
 215                 brq.mrq.stop = brq.data.blocks > 1 ? &brq.stop : NULL;
 216
 217                 brq.data.sg = mq->sg;
 218                 brq.data.sg_len = blk_rq_map_sg(req->q, req, brq.data.sg);
 219
 220                 mmc_wait_for_req(card->host, &brq.mrq);
 221                 if (brq.cmd.error) {
 222                         printk(KERN_ERR "%s: error %d sending read/write command\n",
 223                                req->rq_disk->disk_name, brq.cmd.error);
 224                         goto cmd_err;
 225                 }
 226
 227                 if (brq.data.error) {
 228                         printk(KERN_ERR "%s: error %d transferring data\n",
 229                                req->rq_disk->disk_name, brq.data.error);
 230                         goto cmd_err;
 231                 }
 232
 233                 if (brq.stop.error) {
 234                         printk(KERN_ERR "%s: error %d sending stop command\n",
 235                                req->rq_disk->disk_name, brq.stop.error);
 236                         goto cmd_err;
 237                 }
 238
 239                 do {
 240                         int err;
 241
 242                         cmd.opcode = MMC_SEND_STATUS;
 243                         cmd.arg = card->rca << 16;
 244                         cmd.flags = MMC_RSP_R1;
 245                         err = mmc_wait_for_cmd(card->host, &cmd, 5);
 246                         if (err) {
 247                                 printk(KERN_ERR "%s: error %d requesting status\n",
 248                                        req->rq_disk->disk_name, err);
 249                                 goto cmd_err;
 250                         }
 251                 } while (!(cmd.resp[0] & R1_READY_FOR_DATA));
 252
 253 #if 0
 254                 if (cmd.resp[0] & ~0x00000900)
 255                         printk(KERN_ERR "%s: status = %08x\n",
 256                                req->rq_disk->disk_name, cmd.resp[0]);
 257                 if (mmc_decode_status(cmd.resp))
 258                         goto cmd_err;
 259 #endif
 260
 261                 /*
 262                  * A block was successfully transferred.
 263                  */
 264                 spin_lock_irq(&md->lock);
 265                 ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
 266                 if (!ret) {
 267                         /*
 268                          * The whole request completed successfully.
 269                          */
 270                         add_disk_randomness(req->rq_disk);
 271                         blkdev_dequeue_request(req);
 272                         end_that_request_last(req);
 273                 }
 274                 spin_unlock_irq(&md->lock);
 275         } while (ret);
 276
 277         mmc_card_release_host(card);
 278
 279         return 1;
 280
 281  cmd_err:
 282         mmc_card_release_host(card);
 283
 284         /*
 285          * This is a little draconian, but until we get proper
 286          * error handling sorted out here, its the best we can
 287          * do - especially as some hosts have no idea how much
 288          * data was transferred before the error occurred.
 289          */
 290         spin_lock_irq(&md->lock);
 291         do {
 292                 ret = end_that_request_chunk(req, 0,
 293                                 req->current_nr_sectors << 9);
 294         } while (ret);
 295
 296         add_disk_randomness(req->rq_disk);
 297         blkdev_dequeue_request(req);
 298         end_that_request_last(req);
 299         spin_unlock_irq(&md->lock);
 300
 301         return 0;
 302 }
 303
 304 #define MMC_NUM_MINORS  (256 >> MMC_SHIFT)
 305
 306 static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];
 307
 308 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
 309 {
 310         struct mmc_blk_data *md;
 311         int devidx, ret;
 312
 313         devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
 314         if (devidx >= MMC_NUM_MINORS)
 315                 return ERR_PTR(-ENOSPC);
 316         __set_bit(devidx, dev_use);
 317
 318         md = kmalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
 319         if (md) {
 320                 memset(md, 0, sizeof(struct mmc_blk_data));
 321
 322                 md->disk = alloc_disk(1 << MMC_SHIFT);
 323                 if (md->disk == NULL) {
 324                         kfree(md);
 325                         md = ERR_PTR(-ENOMEM);
 326                         goto out;
 327                 }
 328
 329                 spin_lock_init(&md->lock);
 330                 md->usage = 1;
 331
 332                 ret = mmc_init_queue(&md->queue, card, &md->lock);
 333                 if (ret) {
 334                         put_disk(md->disk);
 335                         kfree(md);
 336                         md = ERR_PTR(ret);
 337                         goto out;
 338                 }
 339                 md->queue.prep_fn = mmc_blk_prep_rq;
 340                 md->queue.issue_fn = mmc_blk_issue_rq;
 341                 md->queue.data = md;
 342
 343                 md->disk->major = major;
 344                 md->disk->first_minor = devidx << MMC_SHIFT;
 345                 md->disk->fops = &mmc_bdops;
 346                 md->disk->private_data = md;
 347                 md->disk->queue = md->queue.queue;
 348                 md->disk->driverfs_dev = &card->dev;
 349
 350                 /*
 351                  * As discussed on lkml, GENHD_FL_REMOVABLE should:
 352                  *
 353                  * - be set for removable media with permanent block devices
 354                  * - be unset for removable block devices with permanent media
 355                  *
 356                  * Since MMC block devices clearly fall under the second
 357                  * case, we do not set GENHD_FL_REMOVABLE.  Userspace
 358                  * should use the block device creation/destruction hotplug
 359                  * messages to tell when the card is present.
 360                  */
 361
 362                 sprintf(md->disk->disk_name, "mmcblk%d", devidx);
 363                 sprintf(md->disk->devfs_name, "mmc/blk%d", devidx);
 364
 365                 md->block_bits = card->csd.read_blkbits;
 366
 367                 blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);
 368                 set_capacity(md->disk, card->csd.capacity);
 369         }
 370  out:
 371         return md;
 372 }
 373
 374 static int
 375 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
 376 {
 377         struct mmc_command cmd;
 378         int err;
 379
 380         mmc_card_claim_host(card);
 381         cmd.opcode = MMC_SET_BLOCKLEN;
 382         cmd.arg = 1 << card->csd.read_blkbits;
 383         cmd.flags = MMC_RSP_R1;
 384         err = mmc_wait_for_cmd(card->host, &cmd, 5);
 385         mmc_card_release_host(card);
 386
 387         if (err) {
 388                 printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
 389                         md->disk->disk_name, cmd.arg, err);
 390                 return -EINVAL;
 391         }
 392
 393         return 0;
 394 }
 395
 396 #if 1   // add by Victor Yu. 12-15-2005
 397 #include        <linux/kmod.h>
 398 static void     mountsd(char *action)
 399 {
 400         char    *argv[2], **envp, *buf, *scratch;
 401         int     i=0;
 402
 403         if ( in_interrupt() )
 404                 return;
 405         if ( !current->fs->root )
 406                 return;
 407         if ( !(envp=(char **)kmalloc(10*sizeof(char *), GFP_KERNEL)) )
 408                 return;
 409         if ( !(buf=kmalloc(256, GFP_KERNEL)) )
 410                 return;
 411         argv[0] = "/bin/sdpnp";
 412         argv[1] = 0;
 413         envp[i++] = "HOME=/";
 414         envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 415         scratch = buf;
 416         envp[i++] = scratch;
 417         scratch += sprintf(scratch, "ACTION=%s", action) + 1;
 418         envp[i++] = 0;
 419         call_usermodehelper(argv[0], argv, envp, 0);
 420         kfree(envp);
 421         kfree(buf);
 422 }
 423 #endif  // 12-15-2005
 424
 425 static int mmc_blk_probe(struct mmc_card *card)
 426 {
 427         struct mmc_blk_data *md;
 428         int err;
 429
 430         /*
 431          * Check that the card supports the command class(es) we need.
 432          */
 433         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
 434                 return -ENODEV;
 435
 436         if (card->csd.read_blkbits < 9) {
 437                 printk(KERN_WARNING "%s: read blocksize too small (%u)\n",
 438                         mmc_card_id(card), 1 << card->csd.read_blkbits);
 439                 return -ENODEV;
 440         }
 441
 442         md = mmc_blk_alloc(card);
 443         if (IS_ERR(md))
 444                 return PTR_ERR(md);
 445
 446         err = mmc_blk_set_blksize(md, card);
 447         if (err)
 448                 goto out;
 449
 450         printk(KERN_INFO "%s: %s %s %dKiB %s\n",
 451                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
 452                 (card->csd.capacity << card->csd.read_blkbits) / 1024,
 453                 mmc_card_readonly(card)?"(ro)":"");
 454
 455         mmc_set_drvdata(card, md);
 456         add_disk(md->disk);
 457 #if 1   // add by Victor Yu. 12-15-2005
 458         mountsd("add");
 459 #if ( defined CONFIG_ARCH_W341 ) || ( defined CONFIG_ARCH_W345 ) || (defined CONFIG_ARCH_W345_IMP1 )
 460         mcpu_gpio_inout( SD_LED , MCPU_GPIO_OUTPUT );
 461         mcpu_gpio_set( SD_LED , MCPU_GPIO_LOW );
 462 #endif
 463
 464 #endif  // 12-15-2005
 465         return 0;
 466
 467  out:
 468         mmc_blk_put(md);
 469
 470         return err;
 471 }
 472
 473 static void mmc_blk_remove(struct mmc_card *card)
 474 {
 475         struct mmc_blk_data *md = mmc_get_drvdata(card);
 476
 477         if (md) {
 478                 int devidx;
 479
 480 #if 1   // add by Victor Yu. 12-15-2005
 481                 mountsd("remove");
 482 #if ( defined CONFIG_ARCH_W341 ) || ( defined CONFIG_ARCH_W345 ) || (defined CONFIG_ARCH_W345_IMP1 )
 483         mcpu_gpio_inout( SD_LED , MCPU_GPIO_OUTPUT );
 484         mcpu_gpio_set( SD_LED , MCPU_GPIO_HIGH );
 485 #endif
 486
 487 #endif  // 12-15-2005
 488                 del_gendisk(md->disk);
 489
 490                 /*
 491                  * I think this is needed.
 492                  */
 493                 md->disk->queue = NULL;
 494
 495                 devidx = md->disk->first_minor >> MMC_SHIFT;
 496                 __clear_bit(devidx, dev_use);
 497
 498                 mmc_blk_put(md);
 499         }
 500         mmc_set_drvdata(card, NULL);
 501 }
 502
 503 #ifdef CONFIG_PM
 504 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
 505 {
 506         struct mmc_blk_data *md = mmc_get_drvdata(card);
 507
 508         if (md) {
 509                 mmc_queue_suspend(&md->queue);
 510         }
 511         return 0;
 512 }
 513
 514 static int mmc_blk_resume(struct mmc_card *card)
 515 {
 516         struct mmc_blk_data *md = mmc_get_drvdata(card);
 517
 518         if (md) {
 519                 mmc_blk_set_blksize(md, card);
 520                 mmc_queue_resume(&md->queue);
 521         }
 522         return 0;
 523 }
 524 #else
 525 #define mmc_blk_suspend NULL
 526 #define mmc_blk_resume  NULL
 527 #endif
 528
 529 static struct mmc_driver mmc_driver = {
 530         .drv            = {
 531                 .name   = "mmcblk",
 532         },
 533         .probe          = mmc_blk_probe,
 534         .remove         = mmc_blk_remove,
 535         .suspend        = mmc_blk_suspend,
 536         .resume         = mmc_blk_resume,
 537 };
 538
 539 static int __init mmc_blk_init(void)
 540 {
 541         int res = -ENOMEM;
 542
 543         res = register_blkdev(major, "mmc");
 544         if (res < 0) {
 545                 printk(KERN_WARNING "Unable to get major %d for MMC media: %d\n",
 546                        major, res);
 547                 goto out;
 548         }
 549         if (major == 0)
 550                 major = res;
 551
 552         devfs_mk_dir("mmc");
 553
 554 #if ( defined CONFIG_ARCH_W341 ) || ( defined CONFIG_ARCH_W345 ) || (defined CONFIG_ARCH_W345_IMP1 )
 555         mcpu_gpio_inout( SD_LED , MCPU_GPIO_OUTPUT );
 556         mcpu_gpio_set( SD_LED , MCPU_GPIO_HIGH );
 557 #endif
 558
 559         return mmc_register_driver(&mmc_driver);
 560
 561  out:
 562         return res;
 563 }
 564
 565 static void __exit mmc_blk_exit(void)
 566 {
 567         mmc_unregister_driver(&mmc_driver);
 568         devfs_remove("mmc");
 569         unregister_blkdev(major, "mmc");
 570 }
 571
 572 module_init(mmc_blk_init);
 573 module_exit(mmc_blk_exit);
 574
 575 MODULE_LICENSE("GPL");
 576 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
 577
 578 module_param(major, int, 0444);
 579 MODULE_PARM_DESC(major, "specify the major device number for MMC block driver");