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