drivers/cdrom/viocd.c

   1 /* -*- linux-c -*-
   2  *  drivers/cdrom/viocd.c
   3  *
   4  *  iSeries Virtual CD Rom
   5  *
   6  *  Authors: Dave Boutcher <boutcher@us.ibm.com>
   7  *           Ryan Arnold <ryanarn@us.ibm.com>
   8  *           Colin Devilbiss <devilbis@us.ibm.com>
   9  *           Stephen Rothwell <sfr@au1.ibm.com>
  10  *
  11  * (C) Copyright 2000-2004 IBM Corporation
  12  *
  13  * This program is free software;  you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License as
  15  * published by the Free Software Foundation; either version 2 of the
  16  * License, or (at your option) anyu later version.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software Foundation,
  25  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  *
  27  * This routine provides access to CD ROM drives owned and managed by an
  28  * OS/400 partition running on the same box as this Linux partition.
  29  *
  30  * All operations are performed by sending messages back and forth to
  31  * the OS/400 partition.
  32  */
  33
  34 #include <linux/major.h>
  35 #include <linux/blkdev.h>
  36 #include <linux/cdrom.h>
  37 #include <linux/errno.h>
  38 #include <linux/init.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/module.h>
  41 #include <linux/completion.h>
  42 #include <linux/proc_fs.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/scatterlist.h>
  45
  46 #include <asm/vio.h>
  47 #include <asm/iseries/hv_types.h>
  48 #include <asm/iseries/hv_lp_event.h>
  49 #include <asm/iseries/vio.h>
  50 #include <asm/firmware.h>
  51
  52 #define VIOCD_DEVICE                    "iseries/vcd"
  53
  54 #define VIOCD_VERS "1.06"
  55
  56 #define VIOCD_KERN_WARNING              KERN_WARNING "viocd: "
  57 #define VIOCD_KERN_INFO                 KERN_INFO "viocd: "
  58
  59 /*
  60  * Should probably make this a module parameter....sigh
  61  */
  62 #define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
  63
  64 static const struct vio_error_entry viocd_err_table[] = {
  65         {0x0201, EINVAL, "Invalid Range"},
  66         {0x0202, EINVAL, "Invalid Token"},
  67         {0x0203, EIO, "DMA Error"},
  68         {0x0204, EIO, "Use Error"},
  69         {0x0205, EIO, "Release Error"},
  70         {0x0206, EINVAL, "Invalid CD"},
  71         {0x020C, EROFS, "Read Only Device"},
  72         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
  73         {0x020E, EIO, "Optical System Error (Varied Off?)"},
  74         {0x02FF, EIO, "Internal Error"},
  75         {0x3010, EIO, "Changed Volume"},
  76         {0xC100, EIO, "Optical System Error"},
  77         {0x0000, 0, NULL},
  78 };
  79
  80 /*
  81  * This is the structure we use to exchange info between driver and interrupt
  82  * handler
  83  */
  84 struct viocd_waitevent {
  85         struct completion       com;
  86         int                     rc;
  87         u16                     sub_result;
  88         int                     changed;
  89 };
  90
  91 /* this is a lookup table for the true capabilities of a device */
  92 struct capability_entry {
  93         char    *type;
  94         int     capability;
  95 };
  96
  97 static struct capability_entry capability_table[] __initdata = {
  98         { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
  99         { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 100         { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 101         { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 102         { "6321", CDC_LOCK },
 103         { "632B", 0 },
 104         { NULL  , CDC_LOCK },
 105 };
 106
 107 /* These are our internal structures for keeping track of devices */
 108 static int viocd_numdev;
 109
 110 struct disk_info {
 111         struct gendisk                  *viocd_disk;
 112         struct cdrom_device_info        viocd_info;
 113         struct device                   *dev;
 114         const char                      *rsrcname;
 115         const char                      *type;
 116         const char                      *model;
 117 };
 118 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 119
 120 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
 121
 122 static spinlock_t viocd_reqlock;
 123
 124 #define MAX_CD_REQ      1
 125
 126 /* procfs support */
 127 static int proc_viocd_show(struct seq_file *m, void *v)
 128 {
 129         int i;
 130
 131         for (i = 0; i < viocd_numdev; i++) {
 132                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
 133                                 "type %4.4s, model %3.3s\n",
 134                                 i, viocd_diskinfo[i].rsrcname,
 135                                 viocd_diskinfo[i].type,
 136                                 viocd_diskinfo[i].model);
 137         }
 138         return 0;
 139 }
 140
 141 static int proc_viocd_open(struct inode *inode, struct file *file)
 142 {
 143         return single_open(file, proc_viocd_show, NULL);
 144 }
 145
 146 static const struct file_operations proc_viocd_operations = {
 147         .open           = proc_viocd_open,
 148         .read           = seq_read,
 149         .llseek         = seq_lseek,
 150         .release        = single_release,
 151 };
 152
 153 static int viocd_blk_open(struct inode *inode, struct file *file)
 154 {
 155         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 156         return cdrom_open(&di->viocd_info, inode, file);
 157 }
 158
 159 static int viocd_blk_release(struct inode *inode, struct file *file)
 160 {
 161         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 162         return cdrom_release(&di->viocd_info, file);
 163 }
 164
 165 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
 166                 unsigned cmd, unsigned long arg)
 167 {
 168         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 169         return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
 170 }
 171
 172 static int viocd_blk_media_changed(struct gendisk *disk)
 173 {
 174         struct disk_info *di = disk->private_data;
 175         return cdrom_media_changed(&di->viocd_info);
 176 }
 177
 178 struct block_device_operations viocd_fops = {
 179         .owner =                THIS_MODULE,
 180         .open =                 viocd_blk_open,
 181         .release =              viocd_blk_release,
 182         .ioctl =                viocd_blk_ioctl,
 183         .media_changed =        viocd_blk_media_changed,
 184 };
 185
 186 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 187 {
 188         struct disk_info *diskinfo = cdi->handle;
 189         int device_no = DEVICE_NR(diskinfo);
 190         HvLpEvent_Rc hvrc;
 191         struct viocd_waitevent we;
 192
 193         init_completion(&we.com);
 194         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 195                         HvLpEvent_Type_VirtualIo,
 196                         viomajorsubtype_cdio | viocdopen,
 197                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 198                         viopath_sourceinst(viopath_hostLp),
 199                         viopath_targetinst(viopath_hostLp),
 200                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 201                         0, 0, 0);
 202         if (hvrc != 0) {
 203                 printk(VIOCD_KERN_WARNING
 204                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 205                                 (int)hvrc);
 206                 return -EIO;
 207         }
 208
 209         wait_for_completion(&we.com);
 210
 211         if (we.rc) {
 212                 const struct vio_error_entry *err =
 213                         vio_lookup_rc(viocd_err_table, we.sub_result);
 214                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
 215                                 we.rc, we.sub_result, err->msg);
 216                 return -err->errno;
 217         }
 218
 219         return 0;
 220 }
 221
 222 static void viocd_release(struct cdrom_device_info *cdi)
 223 {
 224         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 225         HvLpEvent_Rc hvrc;
 226
 227         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 228                         HvLpEvent_Type_VirtualIo,
 229                         viomajorsubtype_cdio | viocdclose,
 230                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 231                         viopath_sourceinst(viopath_hostLp),
 232                         viopath_targetinst(viopath_hostLp), 0,
 233                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 234         if (hvrc != 0)
 235                 printk(VIOCD_KERN_WARNING
 236                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 237                                 (int)hvrc);
 238 }
 239
 240 /* Send a read or write request to OS/400 */
 241 static int send_request(struct request *req)
 242 {
 243         HvLpEvent_Rc hvrc;
 244         struct disk_info *diskinfo = req->rq_disk->private_data;
 245         u64 len;
 246         dma_addr_t dmaaddr;
 247         int direction;
 248         u16 cmd;
 249         struct scatterlist sg;
 250
 251         BUG_ON(req->nr_phys_segments > 1);
 252
 253         if (rq_data_dir(req) == READ) {
 254                 direction = DMA_FROM_DEVICE;
 255                 cmd = viomajorsubtype_cdio | viocdread;
 256         } else {
 257                 direction = DMA_TO_DEVICE;
 258                 cmd = viomajorsubtype_cdio | viocdwrite;
 259         }
 260
 261         sg_init_table(&sg, 1);
 262         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 263                 printk(VIOCD_KERN_WARNING
 264                                 "error setting up scatter/gather list\n");
 265                 return -1;
 266         }
 267
 268         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 269                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
 270                 return -1;
 271         }
 272         dmaaddr = sg_dma_address(&sg);
 273         len = sg_dma_len(&sg);
 274
 275         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 276                         HvLpEvent_Type_VirtualIo, cmd,
 277                         HvLpEvent_AckInd_DoAck,
 278                         HvLpEvent_AckType_ImmediateAck,
 279                         viopath_sourceinst(viopath_hostLp),
 280                         viopath_targetinst(viopath_hostLp),
 281                         (u64)req, VIOVERSION << 16,
 282                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 283                         (u64)req->sector * 512, len, 0);
 284         if (hvrc != HvLpEvent_Rc_Good) {
 285                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
 286                 return -1;
 287         }
 288
 289         return 0;
 290 }
 291
 292 static void viocd_end_request(struct request *req, int error)
 293 {
 294         int nsectors = req->hard_nr_sectors;
 295
 296         /*
 297          * Make sure it's fully ended, and ensure that we process
 298          * at least one sector.
 299          */
 300         if (blk_pc_request(req))
 301                 nsectors = (req->data_len + 511) >> 9;
 302         if (!nsectors)
 303                 nsectors = 1;
 304
 305         if (__blk_end_request(req, error, nsectors << 9))
 306                 BUG();
 307 }
 308
 309 static int rwreq;
 310
 311 static void do_viocd_request(struct request_queue *q)
 312 {
 313         struct request *req;
 314
 315         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
 316                 if (!blk_fs_request(req))
 317                         viocd_end_request(req, -EIO);
 318                 else if (send_request(req) < 0) {
 319                         printk(VIOCD_KERN_WARNING
 320                                         "unable to send message to OS/400!");
 321                         viocd_end_request(req, -EIO);
 322                 } else
 323                         rwreq++;
 324         }
 325 }
 326
 327 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 328 {
 329         struct viocd_waitevent we;
 330         HvLpEvent_Rc hvrc;
 331         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 332
 333         init_completion(&we.com);
 334
 335         /* Send the open event to OS/400 */
 336         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 337                         HvLpEvent_Type_VirtualIo,
 338                         viomajorsubtype_cdio | viocdcheck,
 339                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 340                         viopath_sourceinst(viopath_hostLp),
 341                         viopath_targetinst(viopath_hostLp),
 342                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 343                         0, 0, 0);
 344         if (hvrc != 0) {
 345                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 346                                 (int)hvrc);
 347                 return -EIO;
 348         }
 349
 350         wait_for_completion(&we.com);
 351
 352         /* Check the return code.  If bad, assume no change */
 353         if (we.rc) {
 354                 const struct vio_error_entry *err =
 355                         vio_lookup_rc(viocd_err_table, we.sub_result);
 356                 printk(VIOCD_KERN_WARNING
 357                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 358                                 we.rc, we.sub_result, err->msg);
 359                 return 0;
 360         }
 361
 362         return we.changed;
 363 }
 364
 365 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 366 {
 367         HvLpEvent_Rc hvrc;
 368         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 369         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 370         u64 flags = !!locking;
 371         struct viocd_waitevent we;
 372
 373         init_completion(&we.com);
 374
 375         /* Send the lockdoor event to OS/400 */
 376         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 377                         HvLpEvent_Type_VirtualIo,
 378                         viomajorsubtype_cdio | viocdlockdoor,
 379                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 380                         viopath_sourceinst(viopath_hostLp),
 381                         viopath_targetinst(viopath_hostLp),
 382                         (u64)&we, VIOVERSION << 16,
 383                         (device_no << 48) | (flags << 32), 0, 0, 0);
 384         if (hvrc != 0) {
 385                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 386                                 (int)hvrc);
 387                 return -EIO;
 388         }
 389
 390         wait_for_completion(&we.com);
 391
 392         if (we.rc != 0)
 393                 return -EIO;
 394         return 0;
 395 }
 396
 397 static int viocd_packet(struct cdrom_device_info *cdi,
 398                 struct packet_command *cgc)
 399 {
 400         unsigned int buflen = cgc->buflen;
 401         int ret = -EIO;
 402
 403         switch (cgc->cmd[0]) {
 404         case GPCMD_READ_DISC_INFO:
 405                 {
 406                         disc_information *di = (disc_information *)cgc->buffer;
 407
 408                         if (buflen >= 2) {
 409                                 di->disc_information_length = cpu_to_be16(1);
 410                                 ret = 0;
 411                         }
 412                         if (buflen >= 3)
 413                                 di->erasable =
 414                                         (cdi->ops->capability & ~cdi->mask
 415                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
 416                 }
 417                 break;
 418         case GPCMD_GET_CONFIGURATION:
 419                 if (cgc->cmd[3] == CDF_RWRT) {
 420                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
 421
 422                         if ((buflen >=
 423                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
 424                             (cdi->ops->capability & ~cdi->mask
 425                              & (CDC_DVD_RAM | CDC_RAM))) {
 426                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
 427                                 rfd->curr = 1;
 428                                 ret = 0;
 429                         }
 430                 }
 431                 break;
 432         default:
 433                 if (cgc->sense) {
 434                         /* indicate Unknown code */
 435                         cgc->sense->sense_key = 0x05;
 436                         cgc->sense->asc = 0x20;
 437                         cgc->sense->ascq = 0x00;
 438                 }
 439                 break;
 440         }
 441
 442         cgc->stat = ret;
 443         return ret;
 444 }
 445
 446 static void restart_all_queues(int first_index)
 447 {
 448         int i;
 449
 450         for (i = first_index + 1; i < viocd_numdev; i++)
 451                 if (viocd_diskinfo[i].viocd_disk)
 452                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 453         for (i = 0; i <= first_index; i++)
 454                 if (viocd_diskinfo[i].viocd_disk)
 455                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 456 }
 457
 458 /* This routine handles incoming CD LP events */
 459 static void vio_handle_cd_event(struct HvLpEvent *event)
 460 {
 461         struct viocdlpevent *bevent;
 462         struct viocd_waitevent *pwe;
 463         struct disk_info *di;
 464         unsigned long flags;
 465         struct request *req;
 466
 467
 468         if (event == NULL)
 469                 /* Notification that a partition went away! */
 470                 return;
 471         /* First, we should NEVER get an int here...only acks */
 472         if (hvlpevent_is_int(event)) {
 473                 printk(VIOCD_KERN_WARNING
 474                                 "Yikes! got an int in viocd event handler!\n");
 475                 if (hvlpevent_need_ack(event)) {
 476                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 477                         HvCallEvent_ackLpEvent(event);
 478                 }
 479         }
 480
 481         bevent = (struct viocdlpevent *)event;
 482
 483         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 484         case viocdopen:
 485                 if (event->xRc == 0) {
 486                         di = &viocd_diskinfo[bevent->disk];
 487                         blk_queue_hardsect_size(di->viocd_disk->queue,
 488                                         bevent->block_size);
 489                         set_capacity(di->viocd_disk,
 490                                         bevent->media_size *
 491                                         bevent->block_size / 512);
 492                 }
 493                 /* FALLTHROUGH !! */
 494         case viocdlockdoor:
 495                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 496 return_complete:
 497                 pwe->rc = event->xRc;
 498                 pwe->sub_result = bevent->sub_result;
 499                 complete(&pwe->com);
 500                 break;
 501
 502         case viocdcheck:
 503                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 504                 pwe->changed = bevent->flags;
 505                 goto return_complete;
 506
 507         case viocdclose:
 508                 break;
 509
 510         case viocdwrite:
 511         case viocdread:
 512                 /*
 513                  * Since this is running in interrupt mode, we need to
 514                  * make sure we're not stepping on any global I/O operations
 515                  */
 516                 di = &viocd_diskinfo[bevent->disk];
 517                 spin_lock_irqsave(&viocd_reqlock, flags);
 518                 dma_unmap_single(di->dev, bevent->token, bevent->len,
 519                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 520                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 521                 req = (struct request *)bevent->event.xCorrelationToken;
 522                 rwreq--;
 523
 524                 if (event->xRc != HvLpEvent_Rc_Good) {
 525                         const struct vio_error_entry *err =
 526                                 vio_lookup_rc(viocd_err_table,
 527                                                 bevent->sub_result);
 528                         printk(VIOCD_KERN_WARNING "request %p failed "
 529                                         "with rc %d:0x%04X: %s\n",
 530                                         req, event->xRc,
 531                                         bevent->sub_result, err->msg);
 532                         viocd_end_request(req, -EIO);
 533                 } else
 534                         viocd_end_request(req, 0);
 535
 536                 /* restart handling of incoming requests */
 537                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 538                 restart_all_queues(bevent->disk);
 539                 break;
 540
 541         default:
 542                 printk(VIOCD_KERN_WARNING
 543                                 "message with invalid subtype %0x04X!\n",
 544                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 545                 if (hvlpevent_need_ack(event)) {
 546                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 547                         HvCallEvent_ackLpEvent(event);
 548                 }
 549         }
 550 }
 551
 552 static struct cdrom_device_ops viocd_dops = {
 553         .open = viocd_open,
 554         .release = viocd_release,
 555         .media_changed = viocd_media_changed,
 556         .lock_door = viocd_lock_door,
 557         .generic_packet = viocd_packet,
 558         .capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_GENERIC_PACKET | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_RAM
 559 };
 560
 561 static int __init find_capability(const char *type)
 562 {
 563         struct capability_entry *entry;
 564
 565         for(entry = capability_table; entry->type; ++entry)
 566                 if(!strncmp(entry->type, type, 4))
 567                         break;
 568         return entry->capability;
 569 }
 570
 571 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 572 {
 573         struct gendisk *gendisk;
 574         int deviceno;
 575         struct disk_info *d;
 576         struct cdrom_device_info *c;
 577         struct request_queue *q;
 578         struct device_node *node = vdev->dev.archdata.of_node;
 579
 580         deviceno = vdev->unit_address;
 581         if (deviceno > VIOCD_MAX_CD)
 582                 return -ENODEV;
 583         if (!node)
 584                 return -ENODEV;
 585
 586         if (deviceno >= viocd_numdev)
 587                 viocd_numdev = deviceno + 1;
 588
 589         d = &viocd_diskinfo[deviceno];
 590         d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
 591         d->type = of_get_property(node, "linux,vio_type", NULL);
 592         d->model = of_get_property(node, "linux,vio_model", NULL);
 593
 594         c = &d->viocd_info;
 595
 596         c->ops = &viocd_dops;
 597         c->speed = 4;
 598         c->capacity = 1;
 599         c->handle = d;
 600         c->mask = ~find_capability(d->type);
 601         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 602
 603         if (register_cdrom(c) != 0) {
 604                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
 605                                 c->name);
 606                 goto out;
 607         }
 608         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
 609                         "type %4.4s, model %3.3s\n",
 610                         c->name, d->rsrcname, d->type, d->model);
 611         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
 612         if (q == NULL) {
 613                 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
 614                                 c->name);
 615                 goto out_unregister_cdrom;
 616         }
 617         gendisk = alloc_disk(1);
 618         if (gendisk == NULL) {
 619                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
 620                                 c->name);
 621                 goto out_cleanup_queue;
 622         }
 623         gendisk->major = VIOCD_MAJOR;
 624         gendisk->first_minor = deviceno;
 625         strncpy(gendisk->disk_name, c->name,
 626                         sizeof(gendisk->disk_name));
 627         blk_queue_max_hw_segments(q, 1);
 628         blk_queue_max_phys_segments(q, 1);
 629         blk_queue_max_sectors(q, 4096 / 512);
 630         gendisk->queue = q;
 631         gendisk->fops = &viocd_fops;
 632         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 633         set_capacity(gendisk, 0);
 634         gendisk->private_data = d;
 635         d->viocd_disk = gendisk;
 636         d->dev = &vdev->dev;
 637         gendisk->driverfs_dev = d->dev;
 638         add_disk(gendisk);
 639         return 0;
 640
 641 out_cleanup_queue:
 642         blk_cleanup_queue(q);
 643 out_unregister_cdrom:
 644         unregister_cdrom(c);
 645 out:
 646         return -ENODEV;
 647 }
 648
 649 static int viocd_remove(struct vio_dev *vdev)
 650 {
 651         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 652
 653         if (unregister_cdrom(&d->viocd_info) != 0)
 654                 printk(VIOCD_KERN_WARNING
 655                                 "Cannot unregister viocd CD-ROM %s!\n",
 656                                 d->viocd_info.name);
 657         del_gendisk(d->viocd_disk);
 658         blk_cleanup_queue(d->viocd_disk->queue);
 659         put_disk(d->viocd_disk);
 660         return 0;
 661 }
 662
 663 /**
 664  * viocd_device_table: Used by vio.c to match devices that we
 665  * support.
 666  */
 667 static struct vio_device_id viocd_device_table[] __devinitdata = {
 668         { "block", "IBM,iSeries-viocd" },
 669         { "", "" }
 670 };
 671 MODULE_DEVICE_TABLE(vio, viocd_device_table);
 672
 673 static struct vio_driver viocd_driver = {
 674         .id_table = viocd_device_table,
 675         .probe = viocd_probe,
 676         .remove = viocd_remove,
 677         .driver = {
 678                 .name = "viocd",
 679                 .owner = THIS_MODULE,
 680         }
 681 };
 682
 683 static int __init viocd_init(void)
 684 {
 685         struct proc_dir_entry *e;
 686         int ret = 0;
 687
 688         if (!firmware_has_feature(FW_FEATURE_ISERIES))
 689                 return -ENODEV;
 690
 691         if (viopath_hostLp == HvLpIndexInvalid) {
 692                 vio_set_hostlp();
 693                 /* If we don't have a host, bail out */
 694                 if (viopath_hostLp == HvLpIndexInvalid)
 695                         return -ENODEV;
 696         }
 697
 698         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
 699                         viopath_hostLp);
 700
 701         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 702                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
 703                                 VIOCD_MAJOR, VIOCD_DEVICE);
 704                 return -EIO;
 705         }
 706
 707         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 708                         MAX_CD_REQ + 2);
 709         if (ret) {
 710                 printk(VIOCD_KERN_WARNING
 711                                 "error opening path to host partition %d\n",
 712                                 viopath_hostLp);
 713                 goto out_unregister;
 714         }
 715
 716         /* Initialize our request handler */
 717         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 718
 719         spin_lock_init(&viocd_reqlock);
 720
 721         ret = vio_register_driver(&viocd_driver);
 722         if (ret)
 723                 goto out_free_info;
 724
 725         e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
 726         if (e) {
 727                 e->owner = THIS_MODULE;
 728                 e->proc_fops = &proc_viocd_operations;
 729         }
 730
 731         return 0;
 732
 733 out_free_info:
 734         vio_clearHandler(viomajorsubtype_cdio);
 735         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 736 out_unregister:
 737         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 738         return ret;
 739 }
 740
 741 static void __exit viocd_exit(void)
 742 {
 743         remove_proc_entry("iSeries/viocd", NULL);
 744         vio_unregister_driver(&viocd_driver);
 745         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 746         vio_clearHandler(viomajorsubtype_cdio);
 747         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 748 }
 749
 750 module_init(viocd_init);
 751 module_exit(viocd_exit);
 752 MODULE_LICENSE("GPL");