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   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         .owner          = THIS_MODULE,
 148         .open           = proc_viocd_open,
 149         .read           = seq_read,
 150         .llseek         = seq_lseek,
 151         .release        = single_release,
 152 };
 153
 154 static int viocd_blk_open(struct inode *inode, struct file *file)
 155 {
 156         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 157         return cdrom_open(&di->viocd_info, inode, file);
 158 }
 159
 160 static int viocd_blk_release(struct inode *inode, struct file *file)
 161 {
 162         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 163         return cdrom_release(&di->viocd_info, file);
 164 }
 165
 166 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
 167                 unsigned cmd, unsigned long arg)
 168 {
 169         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 170         return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
 171 }
 172
 173 static int viocd_blk_media_changed(struct gendisk *disk)
 174 {
 175         struct disk_info *di = disk->private_data;
 176         return cdrom_media_changed(&di->viocd_info);
 177 }
 178
 179 struct block_device_operations viocd_fops = {
 180         .owner =                THIS_MODULE,
 181         .open =                 viocd_blk_open,
 182         .release =              viocd_blk_release,
 183         .ioctl =                viocd_blk_ioctl,
 184         .media_changed =        viocd_blk_media_changed,
 185 };
 186
 187 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 188 {
 189         struct disk_info *diskinfo = cdi->handle;
 190         int device_no = DEVICE_NR(diskinfo);
 191         HvLpEvent_Rc hvrc;
 192         struct viocd_waitevent we;
 193
 194         init_completion(&we.com);
 195         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 196                         HvLpEvent_Type_VirtualIo,
 197                         viomajorsubtype_cdio | viocdopen,
 198                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 199                         viopath_sourceinst(viopath_hostLp),
 200                         viopath_targetinst(viopath_hostLp),
 201                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 202                         0, 0, 0);
 203         if (hvrc != 0) {
 204                 printk(VIOCD_KERN_WARNING
 205                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 206                                 (int)hvrc);
 207                 return -EIO;
 208         }
 209
 210         wait_for_completion(&we.com);
 211
 212         if (we.rc) {
 213                 const struct vio_error_entry *err =
 214                         vio_lookup_rc(viocd_err_table, we.sub_result);
 215                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
 216                                 we.rc, we.sub_result, err->msg);
 217                 return -err->errno;
 218         }
 219
 220         return 0;
 221 }
 222
 223 static void viocd_release(struct cdrom_device_info *cdi)
 224 {
 225         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 226         HvLpEvent_Rc hvrc;
 227
 228         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 229                         HvLpEvent_Type_VirtualIo,
 230                         viomajorsubtype_cdio | viocdclose,
 231                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 232                         viopath_sourceinst(viopath_hostLp),
 233                         viopath_targetinst(viopath_hostLp), 0,
 234                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 235         if (hvrc != 0)
 236                 printk(VIOCD_KERN_WARNING
 237                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 238                                 (int)hvrc);
 239 }
 240
 241 /* Send a read or write request to OS/400 */
 242 static int send_request(struct request *req)
 243 {
 244         HvLpEvent_Rc hvrc;
 245         struct disk_info *diskinfo = req->rq_disk->private_data;
 246         u64 len;
 247         dma_addr_t dmaaddr;
 248         int direction;
 249         u16 cmd;
 250         struct scatterlist sg;
 251
 252         BUG_ON(req->nr_phys_segments > 1);
 253
 254         if (rq_data_dir(req) == READ) {
 255                 direction = DMA_FROM_DEVICE;
 256                 cmd = viomajorsubtype_cdio | viocdread;
 257         } else {
 258                 direction = DMA_TO_DEVICE;
 259                 cmd = viomajorsubtype_cdio | viocdwrite;
 260         }
 261
 262         sg_init_table(&sg, 1);
 263         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 264                 printk(VIOCD_KERN_WARNING
 265                                 "error setting up scatter/gather list\n");
 266                 return -1;
 267         }
 268
 269         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 270                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
 271                 return -1;
 272         }
 273         dmaaddr = sg_dma_address(&sg);
 274         len = sg_dma_len(&sg);
 275
 276         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 277                         HvLpEvent_Type_VirtualIo, cmd,
 278                         HvLpEvent_AckInd_DoAck,
 279                         HvLpEvent_AckType_ImmediateAck,
 280                         viopath_sourceinst(viopath_hostLp),
 281                         viopath_targetinst(viopath_hostLp),
 282                         (u64)req, VIOVERSION << 16,
 283                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 284                         (u64)req->sector * 512, len, 0);
 285         if (hvrc != HvLpEvent_Rc_Good) {
 286                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
 287                 return -1;
 288         }
 289
 290         return 0;
 291 }
 292
 293 static void viocd_end_request(struct request *req, int error)
 294 {
 295         int nsectors = req->hard_nr_sectors;
 296
 297         /*
 298          * Make sure it's fully ended, and ensure that we process
 299          * at least one sector.
 300          */
 301         if (blk_pc_request(req))
 302                 nsectors = (req->data_len + 511) >> 9;
 303         if (!nsectors)
 304                 nsectors = 1;
 305
 306         if (__blk_end_request(req, error, nsectors << 9))
 307                 BUG();
 308 }
 309
 310 static int rwreq;
 311
 312 static void do_viocd_request(struct request_queue *q)
 313 {
 314         struct request *req;
 315
 316         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
 317                 if (!blk_fs_request(req))
 318                         viocd_end_request(req, -EIO);
 319                 else if (send_request(req) < 0) {
 320                         printk(VIOCD_KERN_WARNING
 321                                         "unable to send message to OS/400!");
 322                         viocd_end_request(req, -EIO);
 323                 } else
 324                         rwreq++;
 325         }
 326 }
 327
 328 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 329 {
 330         struct viocd_waitevent we;
 331         HvLpEvent_Rc hvrc;
 332         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 333
 334         init_completion(&we.com);
 335
 336         /* Send the open event to OS/400 */
 337         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 338                         HvLpEvent_Type_VirtualIo,
 339                         viomajorsubtype_cdio | viocdcheck,
 340                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 341                         viopath_sourceinst(viopath_hostLp),
 342                         viopath_targetinst(viopath_hostLp),
 343                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 344                         0, 0, 0);
 345         if (hvrc != 0) {
 346                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 347                                 (int)hvrc);
 348                 return -EIO;
 349         }
 350
 351         wait_for_completion(&we.com);
 352
 353         /* Check the return code.  If bad, assume no change */
 354         if (we.rc) {
 355                 const struct vio_error_entry *err =
 356                         vio_lookup_rc(viocd_err_table, we.sub_result);
 357                 printk(VIOCD_KERN_WARNING
 358                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 359                                 we.rc, we.sub_result, err->msg);
 360                 return 0;
 361         }
 362
 363         return we.changed;
 364 }
 365
 366 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 367 {
 368         HvLpEvent_Rc hvrc;
 369         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 370         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 371         u64 flags = !!locking;
 372         struct viocd_waitevent we;
 373
 374         init_completion(&we.com);
 375
 376         /* Send the lockdoor event to OS/400 */
 377         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 378                         HvLpEvent_Type_VirtualIo,
 379                         viomajorsubtype_cdio | viocdlockdoor,
 380                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 381                         viopath_sourceinst(viopath_hostLp),
 382                         viopath_targetinst(viopath_hostLp),
 383                         (u64)&we, VIOVERSION << 16,
 384                         (device_no << 48) | (flags << 32), 0, 0, 0);
 385         if (hvrc != 0) {
 386                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 387                                 (int)hvrc);
 388                 return -EIO;
 389         }
 390
 391         wait_for_completion(&we.com);
 392
 393         if (we.rc != 0)
 394                 return -EIO;
 395         return 0;
 396 }
 397
 398 static int viocd_packet(struct cdrom_device_info *cdi,
 399                 struct packet_command *cgc)
 400 {
 401         unsigned int buflen = cgc->buflen;
 402         int ret = -EIO;
 403
 404         switch (cgc->cmd[0]) {
 405         case GPCMD_READ_DISC_INFO:
 406                 {
 407                         disc_information *di = (disc_information *)cgc->buffer;
 408
 409                         if (buflen >= 2) {
 410                                 di->disc_information_length = cpu_to_be16(1);
 411                                 ret = 0;
 412                         }
 413                         if (buflen >= 3)
 414                                 di->erasable =
 415                                         (cdi->ops->capability & ~cdi->mask
 416                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
 417                 }
 418                 break;
 419         case GPCMD_GET_CONFIGURATION:
 420                 if (cgc->cmd[3] == CDF_RWRT) {
 421                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
 422
 423                         if ((buflen >=
 424                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
 425                             (cdi->ops->capability & ~cdi->mask
 426                              & (CDC_DVD_RAM | CDC_RAM))) {
 427                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
 428                                 rfd->curr = 1;
 429                                 ret = 0;
 430                         }
 431                 }
 432                 break;
 433         default:
 434                 if (cgc->sense) {
 435                         /* indicate Unknown code */
 436                         cgc->sense->sense_key = 0x05;
 437                         cgc->sense->asc = 0x20;
 438                         cgc->sense->ascq = 0x00;
 439                 }
 440                 break;
 441         }
 442
 443         cgc->stat = ret;
 444         return ret;
 445 }
 446
 447 static void restart_all_queues(int first_index)
 448 {
 449         int i;
 450
 451         for (i = first_index + 1; i < viocd_numdev; i++)
 452                 if (viocd_diskinfo[i].viocd_disk)
 453                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 454         for (i = 0; i <= first_index; i++)
 455                 if (viocd_diskinfo[i].viocd_disk)
 456                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 457 }
 458
 459 /* This routine handles incoming CD LP events */
 460 static void vio_handle_cd_event(struct HvLpEvent *event)
 461 {
 462         struct viocdlpevent *bevent;
 463         struct viocd_waitevent *pwe;
 464         struct disk_info *di;
 465         unsigned long flags;
 466         struct request *req;
 467
 468
 469         if (event == NULL)
 470                 /* Notification that a partition went away! */
 471                 return;
 472         /* First, we should NEVER get an int here...only acks */
 473         if (hvlpevent_is_int(event)) {
 474                 printk(VIOCD_KERN_WARNING
 475                                 "Yikes! got an int in viocd event handler!\n");
 476                 if (hvlpevent_need_ack(event)) {
 477                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 478                         HvCallEvent_ackLpEvent(event);
 479                 }
 480         }
 481
 482         bevent = (struct viocdlpevent *)event;
 483
 484         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 485         case viocdopen:
 486                 if (event->xRc == 0) {
 487                         di = &viocd_diskinfo[bevent->disk];
 488                         blk_queue_hardsect_size(di->viocd_disk->queue,
 489                                         bevent->block_size);
 490                         set_capacity(di->viocd_disk,
 491                                         bevent->media_size *
 492                                         bevent->block_size / 512);
 493                 }
 494                 /* FALLTHROUGH !! */
 495         case viocdlockdoor:
 496                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 497 return_complete:
 498                 pwe->rc = event->xRc;
 499                 pwe->sub_result = bevent->sub_result;
 500                 complete(&pwe->com);
 501                 break;
 502
 503         case viocdcheck:
 504                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 505                 pwe->changed = bevent->flags;
 506                 goto return_complete;
 507
 508         case viocdclose:
 509                 break;
 510
 511         case viocdwrite:
 512         case viocdread:
 513                 /*
 514                  * Since this is running in interrupt mode, we need to
 515                  * make sure we're not stepping on any global I/O operations
 516                  */
 517                 di = &viocd_diskinfo[bevent->disk];
 518                 spin_lock_irqsave(&viocd_reqlock, flags);
 519                 dma_unmap_single(di->dev, bevent->token, bevent->len,
 520                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 521                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 522                 req = (struct request *)bevent->event.xCorrelationToken;
 523                 rwreq--;
 524
 525                 if (event->xRc != HvLpEvent_Rc_Good) {
 526                         const struct vio_error_entry *err =
 527                                 vio_lookup_rc(viocd_err_table,
 528                                                 bevent->sub_result);
 529                         printk(VIOCD_KERN_WARNING "request %p failed "
 530                                         "with rc %d:0x%04X: %s\n",
 531                                         req, event->xRc,
 532                                         bevent->sub_result, err->msg);
 533                         viocd_end_request(req, -EIO);
 534                 } else
 535                         viocd_end_request(req, 0);
 536
 537                 /* restart handling of incoming requests */
 538                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 539                 restart_all_queues(bevent->disk);
 540                 break;
 541
 542         default:
 543                 printk(VIOCD_KERN_WARNING
 544                                 "message with invalid subtype %0x04X!\n",
 545                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 546                 if (hvlpevent_need_ack(event)) {
 547                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 548                         HvCallEvent_ackLpEvent(event);
 549                 }
 550         }
 551 }
 552
 553 static struct cdrom_device_ops viocd_dops = {
 554         .open = viocd_open,
 555         .release = viocd_release,
 556         .media_changed = viocd_media_changed,
 557         .lock_door = viocd_lock_door,
 558         .generic_packet = viocd_packet,
 559         .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
 560 };
 561
 562 static int find_capability(const char *type)
 563 {
 564         struct capability_entry *entry;
 565
 566         for(entry = capability_table; entry->type; ++entry)
 567                 if(!strncmp(entry->type, type, 4))
 568                         break;
 569         return entry->capability;
 570 }
 571
 572 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 573 {
 574         struct gendisk *gendisk;
 575         int deviceno;
 576         struct disk_info *d;
 577         struct cdrom_device_info *c;
 578         struct request_queue *q;
 579         struct device_node *node = vdev->dev.archdata.of_node;
 580
 581         deviceno = vdev->unit_address;
 582         if (deviceno > VIOCD_MAX_CD)
 583                 return -ENODEV;
 584         if (!node)
 585                 return -ENODEV;
 586
 587         if (deviceno >= viocd_numdev)
 588                 viocd_numdev = deviceno + 1;
 589
 590         d = &viocd_diskinfo[deviceno];
 591         d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
 592         d->type = of_get_property(node, "linux,vio_type", NULL);
 593         d->model = of_get_property(node, "linux,vio_model", NULL);
 594
 595         c = &d->viocd_info;
 596
 597         c->ops = &viocd_dops;
 598         c->speed = 4;
 599         c->capacity = 1;
 600         c->handle = d;
 601         c->mask = ~find_capability(d->type);
 602         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 603
 604         if (register_cdrom(c) != 0) {
 605                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
 606                                 c->name);
 607                 goto out;
 608         }
 609         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
 610                         "type %4.4s, model %3.3s\n",
 611                         c->name, d->rsrcname, d->type, d->model);
 612         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
 613         if (q == NULL) {
 614                 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
 615                                 c->name);
 616                 goto out_unregister_cdrom;
 617         }
 618         gendisk = alloc_disk(1);
 619         if (gendisk == NULL) {
 620                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
 621                                 c->name);
 622                 goto out_cleanup_queue;
 623         }
 624         gendisk->major = VIOCD_MAJOR;
 625         gendisk->first_minor = deviceno;
 626         strncpy(gendisk->disk_name, c->name,
 627                         sizeof(gendisk->disk_name));
 628         blk_queue_max_hw_segments(q, 1);
 629         blk_queue_max_phys_segments(q, 1);
 630         blk_queue_max_sectors(q, 4096 / 512);
 631         gendisk->queue = q;
 632         gendisk->fops = &viocd_fops;
 633         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 634         set_capacity(gendisk, 0);
 635         gendisk->private_data = d;
 636         d->viocd_disk = gendisk;
 637         d->dev = &vdev->dev;
 638         gendisk->driverfs_dev = d->dev;
 639         add_disk(gendisk);
 640         return 0;
 641
 642 out_cleanup_queue:
 643         blk_cleanup_queue(q);
 644 out_unregister_cdrom:
 645         unregister_cdrom(c);
 646 out:
 647         return -ENODEV;
 648 }
 649
 650 static int viocd_remove(struct vio_dev *vdev)
 651 {
 652         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 653
 654         unregister_cdrom(&d->viocd_info);
 655         del_gendisk(d->viocd_disk);
 656         blk_cleanup_queue(d->viocd_disk->queue);
 657         put_disk(d->viocd_disk);
 658         return 0;
 659 }
 660
 661 /**
 662  * viocd_device_table: Used by vio.c to match devices that we
 663  * support.
 664  */
 665 static struct vio_device_id viocd_device_table[] __devinitdata = {
 666         { "block", "IBM,iSeries-viocd" },
 667         { "", "" }
 668 };
 669 MODULE_DEVICE_TABLE(vio, viocd_device_table);
 670
 671 static struct vio_driver viocd_driver = {
 672         .id_table = viocd_device_table,
 673         .probe = viocd_probe,
 674         .remove = viocd_remove,
 675         .driver = {
 676                 .name = "viocd",
 677                 .owner = THIS_MODULE,
 678         }
 679 };
 680
 681 static int __init viocd_init(void)
 682 {
 683         int ret = 0;
 684
 685         if (!firmware_has_feature(FW_FEATURE_ISERIES))
 686                 return -ENODEV;
 687
 688         if (viopath_hostLp == HvLpIndexInvalid) {
 689                 vio_set_hostlp();
 690                 /* If we don't have a host, bail out */
 691                 if (viopath_hostLp == HvLpIndexInvalid)
 692                         return -ENODEV;
 693         }
 694
 695         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
 696                         viopath_hostLp);
 697
 698         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 699                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
 700                                 VIOCD_MAJOR, VIOCD_DEVICE);
 701                 return -EIO;
 702         }
 703
 704         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 705                         MAX_CD_REQ + 2);
 706         if (ret) {
 707                 printk(VIOCD_KERN_WARNING
 708                                 "error opening path to host partition %d\n",
 709                                 viopath_hostLp);
 710                 goto out_unregister;
 711         }
 712
 713         /* Initialize our request handler */
 714         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 715
 716         spin_lock_init(&viocd_reqlock);
 717
 718         ret = vio_register_driver(&viocd_driver);
 719         if (ret)
 720                 goto out_free_info;
 721
 722         proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
 723                     &proc_viocd_operations);
 724         return 0;
 725
 726 out_free_info:
 727         vio_clearHandler(viomajorsubtype_cdio);
 728         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 729 out_unregister:
 730         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 731         return ret;
 732 }
 733
 734 static void __exit viocd_exit(void)
 735 {
 736         remove_proc_entry("iSeries/viocd", NULL);
 737         vio_unregister_driver(&viocd_driver);
 738         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 739         vio_clearHandler(viomajorsubtype_cdio);
 740         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 741 }
 742
 743 module_init(viocd_init);
 744 module_exit(viocd_exit);
 745 MODULE_LICENSE("GPL");