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
  45 #include <asm/bug.h>
  46
  47 #include <asm/vio.h>
  48 #include <asm/scatterlist.h>
  49 #include <asm/iSeries/HvTypes.h>
  50 #include <asm/iSeries/HvLpEvent.h>
  51 #include <asm/iSeries/vio.h>
  52
  53 #define VIOCD_DEVICE                    "iseries/vcd"
  54 #define VIOCD_DEVICE_DEVFS              "iseries/vcd"
  55
  56 #define VIOCD_VERS "1.06"
  57
  58 #define VIOCD_KERN_WARNING              KERN_WARNING "viocd: "
  59 #define VIOCD_KERN_INFO                 KERN_INFO "viocd: "
  60
  61 struct viocdlpevent {
  62         struct HvLpEvent        event;
  63         u32                     reserved;
  64         u16                     version;
  65         u16                     sub_result;
  66         u16                     disk;
  67         u16                     flags;
  68         u32                     token;
  69         u64                     offset;         /* On open, max number of disks */
  70         u64                     len;            /* On open, size of the disk */
  71         u32                     block_size;     /* Only set on open */
  72         u32                     media_size;     /* Only set on open */
  73 };
  74
  75 enum viocdsubtype {
  76         viocdopen = 0x0001,
  77         viocdclose = 0x0002,
  78         viocdread = 0x0003,
  79         viocdwrite = 0x0004,
  80         viocdlockdoor = 0x0005,
  81         viocdgetinfo = 0x0006,
  82         viocdcheck = 0x0007
  83 };
  84
  85 /*
  86  * Should probably make this a module parameter....sigh
  87  */
  88 #define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
  89
  90 static const struct vio_error_entry viocd_err_table[] = {
  91         {0x0201, EINVAL, "Invalid Range"},
  92         {0x0202, EINVAL, "Invalid Token"},
  93         {0x0203, EIO, "DMA Error"},
  94         {0x0204, EIO, "Use Error"},
  95         {0x0205, EIO, "Release Error"},
  96         {0x0206, EINVAL, "Invalid CD"},
  97         {0x020C, EROFS, "Read Only Device"},
  98         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
  99         {0x020E, EIO, "Optical System Error (Varied Off?)"},
 100         {0x02FF, EIO, "Internal Error"},
 101         {0x3010, EIO, "Changed Volume"},
 102         {0xC100, EIO, "Optical System Error"},
 103         {0x0000, 0, NULL},
 104 };
 105
 106 /*
 107  * This is the structure we use to exchange info between driver and interrupt
 108  * handler
 109  */
 110 struct viocd_waitevent {
 111         struct completion       com;
 112         int                     rc;
 113         u16                     sub_result;
 114         int                     changed;
 115 };
 116
 117 /* this is a lookup table for the true capabilities of a device */
 118 struct capability_entry {
 119         char    *type;
 120         int     capability;
 121 };
 122
 123 static struct capability_entry capability_table[] __initdata = {
 124         { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 125         { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 126         { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 127         { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 128         { "6321", CDC_LOCK },
 129         { "632B", 0 },
 130         { NULL  , CDC_LOCK },
 131 };
 132
 133 /* These are our internal structures for keeping track of devices */
 134 static int viocd_numdev;
 135
 136 struct cdrom_info {
 137         char    rsrcname[10];
 138         char    type[4];
 139         char    model[3];
 140 };
 141 /*
 142  * This needs to be allocated since it is passed to the
 143  * Hypervisor and we may be a module.
 144  */
 145 static struct cdrom_info *viocd_unitinfo;
 146 static dma_addr_t unitinfo_dmaaddr;
 147
 148 struct disk_info {
 149         struct gendisk                  *viocd_disk;
 150         struct cdrom_device_info        viocd_info;
 151         struct device                   *dev;
 152 };
 153 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 154
 155 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
 156
 157 static request_queue_t *viocd_queue;
 158 static spinlock_t viocd_reqlock;
 159
 160 #define MAX_CD_REQ      1
 161
 162 /* procfs support */
 163 static int proc_viocd_show(struct seq_file *m, void *v)
 164 {
 165         int i;
 166
 167         for (i = 0; i < viocd_numdev; i++) {
 168                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
 169                                 "type %4.4s, model %3.3s\n",
 170                                 i, viocd_unitinfo[i].rsrcname,
 171                                 viocd_unitinfo[i].type,
 172                                 viocd_unitinfo[i].model);
 173         }
 174         return 0;
 175 }
 176
 177 static int proc_viocd_open(struct inode *inode, struct file *file)
 178 {
 179         return single_open(file, proc_viocd_show, NULL);
 180 }
 181
 182 static struct file_operations proc_viocd_operations = {
 183         .open           = proc_viocd_open,
 184         .read           = seq_read,
 185         .llseek         = seq_lseek,
 186         .release        = single_release,
 187 };
 188
 189 static int viocd_blk_open(struct inode *inode, struct file *file)
 190 {
 191         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 192         return cdrom_open(&di->viocd_info, inode, file);
 193 }
 194
 195 static int viocd_blk_release(struct inode *inode, struct file *file)
 196 {
 197         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 198         return cdrom_release(&di->viocd_info, file);
 199 }
 200
 201 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
 202                 unsigned cmd, unsigned long arg)
 203 {
 204         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 205         return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
 206 }
 207
 208 static int viocd_blk_media_changed(struct gendisk *disk)
 209 {
 210         struct disk_info *di = disk->private_data;
 211         return cdrom_media_changed(&di->viocd_info);
 212 }
 213
 214 struct block_device_operations viocd_fops = {
 215         .owner =                THIS_MODULE,
 216         .open =                 viocd_blk_open,
 217         .release =              viocd_blk_release,
 218         .ioctl =                viocd_blk_ioctl,
 219         .media_changed =        viocd_blk_media_changed,
 220 };
 221
 222 /* Get info on CD devices from OS/400 */
 223 static void __init get_viocd_info(void)
 224 {
 225         HvLpEvent_Rc hvrc;
 226         int i;
 227         struct viocd_waitevent we;
 228
 229         viocd_unitinfo = dma_alloc_coherent(iSeries_vio_dev,
 230                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 231                         &unitinfo_dmaaddr, GFP_ATOMIC);
 232         if (viocd_unitinfo == NULL) {
 233                 printk(VIOCD_KERN_WARNING "error allocating unitinfo\n");
 234                 return;
 235         }
 236
 237         memset(viocd_unitinfo, 0, sizeof(*viocd_unitinfo) * VIOCD_MAX_CD);
 238
 239         init_completion(&we.com);
 240
 241         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 242                         HvLpEvent_Type_VirtualIo,
 243                         viomajorsubtype_cdio | viocdgetinfo,
 244                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 245                         viopath_sourceinst(viopath_hostLp),
 246                         viopath_targetinst(viopath_hostLp),
 247                         (u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
 248                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD, 0);
 249         if (hvrc != HvLpEvent_Rc_Good) {
 250                 printk(VIOCD_KERN_WARNING "cdrom error sending event. rc %d\n",
 251                                 (int)hvrc);
 252                 goto error_ret;
 253         }
 254
 255         wait_for_completion(&we.com);
 256
 257         if (we.rc) {
 258                 const struct vio_error_entry *err =
 259                         vio_lookup_rc(viocd_err_table, we.sub_result);
 260                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on getinfo: %s\n",
 261                                 we.rc, we.sub_result, err->msg);
 262                 goto error_ret;
 263         }
 264
 265         for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++)
 266                 viocd_numdev++;
 267
 268 error_ret:
 269         if (viocd_numdev == 0) {
 270                 dma_free_coherent(iSeries_vio_dev,
 271                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 272                                 viocd_unitinfo, unitinfo_dmaaddr);
 273                 viocd_unitinfo = NULL;
 274         }
 275 }
 276
 277 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 278 {
 279         struct disk_info *diskinfo = cdi->handle;
 280         int device_no = DEVICE_NR(diskinfo);
 281         HvLpEvent_Rc hvrc;
 282         struct viocd_waitevent we;
 283
 284         init_completion(&we.com);
 285         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 286                         HvLpEvent_Type_VirtualIo,
 287                         viomajorsubtype_cdio | viocdopen,
 288                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 289                         viopath_sourceinst(viopath_hostLp),
 290                         viopath_targetinst(viopath_hostLp),
 291                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 292                         0, 0, 0);
 293         if (hvrc != 0) {
 294                 printk(VIOCD_KERN_WARNING
 295                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 296                                 (int)hvrc);
 297                 return -EIO;
 298         }
 299
 300         wait_for_completion(&we.com);
 301
 302         if (we.rc) {
 303                 const struct vio_error_entry *err =
 304                         vio_lookup_rc(viocd_err_table, we.sub_result);
 305                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
 306                                 we.rc, we.sub_result, err->msg);
 307                 return -err->errno;
 308         }
 309
 310         return 0;
 311 }
 312
 313 static void viocd_release(struct cdrom_device_info *cdi)
 314 {
 315         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 316         HvLpEvent_Rc hvrc;
 317
 318         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 319                         HvLpEvent_Type_VirtualIo,
 320                         viomajorsubtype_cdio | viocdclose,
 321                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 322                         viopath_sourceinst(viopath_hostLp),
 323                         viopath_targetinst(viopath_hostLp), 0,
 324                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 325         if (hvrc != 0)
 326                 printk(VIOCD_KERN_WARNING
 327                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 328                                 (int)hvrc);
 329 }
 330
 331 /* Send a read or write request to OS/400 */
 332 static int send_request(struct request *req)
 333 {
 334         HvLpEvent_Rc hvrc;
 335         struct disk_info *diskinfo = req->rq_disk->private_data;
 336         u64 len;
 337         dma_addr_t dmaaddr;
 338         int direction;
 339         u16 cmd;
 340         struct scatterlist sg;
 341
 342         BUG_ON(req->nr_phys_segments > 1);
 343
 344         if (rq_data_dir(req) == READ) {
 345                 direction = DMA_FROM_DEVICE;
 346                 cmd = viomajorsubtype_cdio | viocdread;
 347         } else {
 348                 direction = DMA_TO_DEVICE;
 349                 cmd = viomajorsubtype_cdio | viocdwrite;
 350         }
 351
 352         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 353                 printk(VIOCD_KERN_WARNING
 354                                 "error setting up scatter/gather list\n");
 355                 return -1;
 356         }
 357
 358         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 359                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
 360                 return -1;
 361         }
 362         dmaaddr = sg_dma_address(&sg);
 363         len = sg_dma_len(&sg);
 364
 365         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 366                         HvLpEvent_Type_VirtualIo, cmd,
 367                         HvLpEvent_AckInd_DoAck,
 368                         HvLpEvent_AckType_ImmediateAck,
 369                         viopath_sourceinst(viopath_hostLp),
 370                         viopath_targetinst(viopath_hostLp),
 371                         (u64)req, VIOVERSION << 16,
 372                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 373                         (u64)req->sector * 512, len, 0);
 374         if (hvrc != HvLpEvent_Rc_Good) {
 375                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
 376                 return -1;
 377         }
 378
 379         return 0;
 380 }
 381
 382
 383 static int rwreq;
 384
 385 static void do_viocd_request(request_queue_t *q)
 386 {
 387         struct request *req;
 388
 389         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
 390                 if (!blk_fs_request(req))
 391                         end_request(req, 0);
 392                 else if (send_request(req) < 0) {
 393                         printk(VIOCD_KERN_WARNING
 394                                         "unable to send message to OS/400!");
 395                         end_request(req, 0);
 396                 } else
 397                         rwreq++;
 398         }
 399 }
 400
 401 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 402 {
 403         struct viocd_waitevent we;
 404         HvLpEvent_Rc hvrc;
 405         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 406
 407         init_completion(&we.com);
 408
 409         /* Send the open event to OS/400 */
 410         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 411                         HvLpEvent_Type_VirtualIo,
 412                         viomajorsubtype_cdio | viocdcheck,
 413                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 414                         viopath_sourceinst(viopath_hostLp),
 415                         viopath_targetinst(viopath_hostLp),
 416                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 417                         0, 0, 0);
 418         if (hvrc != 0) {
 419                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 420                                 (int)hvrc);
 421                 return -EIO;
 422         }
 423
 424         wait_for_completion(&we.com);
 425
 426         /* Check the return code.  If bad, assume no change */
 427         if (we.rc) {
 428                 const struct vio_error_entry *err =
 429                         vio_lookup_rc(viocd_err_table, we.sub_result);
 430                 printk(VIOCD_KERN_WARNING
 431                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 432                                 we.rc, we.sub_result, err->msg);
 433                 return 0;
 434         }
 435
 436         return we.changed;
 437 }
 438
 439 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 440 {
 441         HvLpEvent_Rc hvrc;
 442         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 443         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 444         u64 flags = !!locking;
 445         struct viocd_waitevent we;
 446
 447         init_completion(&we.com);
 448
 449         /* Send the lockdoor event to OS/400 */
 450         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 451                         HvLpEvent_Type_VirtualIo,
 452                         viomajorsubtype_cdio | viocdlockdoor,
 453                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 454                         viopath_sourceinst(viopath_hostLp),
 455                         viopath_targetinst(viopath_hostLp),
 456                         (u64)&we, VIOVERSION << 16,
 457                         (device_no << 48) | (flags << 32), 0, 0, 0);
 458         if (hvrc != 0) {
 459                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 460                                 (int)hvrc);
 461                 return -EIO;
 462         }
 463
 464         wait_for_completion(&we.com);
 465
 466         if (we.rc != 0)
 467                 return -EIO;
 468         return 0;
 469 }
 470
 471 static int viocd_packet(struct cdrom_device_info *cdi,
 472                 struct packet_command *cgc)
 473 {
 474         unsigned int buflen = cgc->buflen;
 475         int ret = -EIO;
 476
 477         switch (cgc->cmd[0]) {
 478         case GPCMD_READ_DISC_INFO:
 479                 {
 480                         disc_information *di = (disc_information *)cgc->buffer;
 481
 482                         if (buflen >= 2) {
 483                                 di->disc_information_length = cpu_to_be16(1);
 484                                 ret = 0;
 485                         }
 486                         if (buflen >= 3)
 487                                 di->erasable =
 488                                         (cdi->ops->capability & ~cdi->mask
 489                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
 490                 }
 491                 break;
 492         default:
 493                 if (cgc->sense) {
 494                         /* indicate Unknown code */
 495                         cgc->sense->sense_key = 0x05;
 496                         cgc->sense->asc = 0x20;
 497                         cgc->sense->ascq = 0x00;
 498                 }
 499                 break;
 500         }
 501
 502         cgc->stat = ret;
 503         return ret;
 504 }
 505
 506 /* This routine handles incoming CD LP events */
 507 static void vio_handle_cd_event(struct HvLpEvent *event)
 508 {
 509         struct viocdlpevent *bevent;
 510         struct viocd_waitevent *pwe;
 511         struct disk_info *di;
 512         unsigned long flags;
 513         struct request *req;
 514
 515
 516         if (event == NULL)
 517                 /* Notification that a partition went away! */
 518                 return;
 519         /* First, we should NEVER get an int here...only acks */
 520         if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
 521                 printk(VIOCD_KERN_WARNING
 522                                 "Yikes! got an int in viocd event handler!\n");
 523                 if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
 524                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 525                         HvCallEvent_ackLpEvent(event);
 526                 }
 527         }
 528
 529         bevent = (struct viocdlpevent *)event;
 530
 531         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 532         case viocdopen:
 533                 if (event->xRc == 0) {
 534                         di = &viocd_diskinfo[bevent->disk];
 535                         blk_queue_hardsect_size(viocd_queue,
 536                                         bevent->block_size);
 537                         set_capacity(di->viocd_disk,
 538                                         bevent->media_size *
 539                                         bevent->block_size / 512);
 540                 }
 541                 /* FALLTHROUGH !! */
 542         case viocdgetinfo:
 543         case viocdlockdoor:
 544                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 545 return_complete:
 546                 pwe->rc = event->xRc;
 547                 pwe->sub_result = bevent->sub_result;
 548                 complete(&pwe->com);
 549                 break;
 550
 551         case viocdcheck:
 552                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 553                 pwe->changed = bevent->flags;
 554                 goto return_complete;
 555
 556         case viocdclose:
 557                 break;
 558
 559         case viocdwrite:
 560         case viocdread:
 561                 /*
 562                  * Since this is running in interrupt mode, we need to
 563                  * make sure we're not stepping on any global I/O operations
 564                  */
 565                 di = &viocd_diskinfo[bevent->disk];
 566                 spin_lock_irqsave(&viocd_reqlock, flags);
 567                 dma_unmap_single(di->dev, bevent->token, bevent->len,
 568                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 569                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 570                 req = (struct request *)bevent->event.xCorrelationToken;
 571                 rwreq--;
 572
 573                 if (event->xRc != HvLpEvent_Rc_Good) {
 574                         const struct vio_error_entry *err =
 575                                 vio_lookup_rc(viocd_err_table,
 576                                                 bevent->sub_result);
 577                         printk(VIOCD_KERN_WARNING "request %p failed "
 578                                         "with rc %d:0x%04X: %s\n",
 579                                         req, event->xRc,
 580                                         bevent->sub_result, err->msg);
 581                         end_request(req, 0);
 582                 } else
 583                         end_request(req, 1);
 584
 585                 /* restart handling of incoming requests */
 586                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 587                 blk_run_queue(viocd_queue);
 588                 break;
 589
 590         default:
 591                 printk(VIOCD_KERN_WARNING
 592                                 "message with invalid subtype %0x04X!\n",
 593                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 594                 if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
 595                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 596                         HvCallEvent_ackLpEvent(event);
 597                 }
 598         }
 599 }
 600
 601 static struct cdrom_device_ops viocd_dops = {
 602         .open = viocd_open,
 603         .release = viocd_release,
 604         .media_changed = viocd_media_changed,
 605         .lock_door = viocd_lock_door,
 606         .generic_packet = viocd_packet,
 607         .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_IOCTLS | CDC_DRIVE_STATUS | CDC_GENERIC_PACKET | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_RAM
 608 };
 609
 610 static int __init find_capability(const char *type)
 611 {
 612         struct capability_entry *entry;
 613
 614         for(entry = capability_table; entry->type; ++entry)
 615                 if(!strncmp(entry->type, type, 4))
 616                         break;
 617         return entry->capability;
 618 }
 619
 620 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 621 {
 622         struct gendisk *gendisk;
 623         int deviceno;
 624         struct disk_info *d;
 625         struct cdrom_device_info *c;
 626         struct cdrom_info *ci;
 627
 628         deviceno = vdev->unit_address;
 629         if (deviceno >= viocd_numdev)
 630                 return -ENODEV;
 631
 632         d = &viocd_diskinfo[deviceno];
 633         c = &d->viocd_info;
 634         ci = &viocd_unitinfo[deviceno];
 635
 636         c->ops = &viocd_dops;
 637         c->speed = 4;
 638         c->capacity = 1;
 639         c->handle = d;
 640         c->mask = ~find_capability(ci->type);
 641         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 642
 643         if (register_cdrom(c) != 0) {
 644                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
 645                                 c->name);
 646                 return 0;
 647         }
 648         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
 649                         "type %4.4s, model %3.3s\n",
 650                         c->name, ci->rsrcname, ci->type, ci->model);
 651         gendisk = alloc_disk(1);
 652         if (gendisk == NULL) {
 653                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
 654                                 c->name);
 655                 unregister_cdrom(c);
 656                 return 0;
 657         }
 658         gendisk->major = VIOCD_MAJOR;
 659         gendisk->first_minor = deviceno;
 660         strncpy(gendisk->disk_name, c->name,
 661                         sizeof(gendisk->disk_name));
 662         snprintf(gendisk->devfs_name, sizeof(gendisk->devfs_name),
 663                         VIOCD_DEVICE_DEVFS "%d", deviceno);
 664         gendisk->queue = viocd_queue;
 665         gendisk->fops = &viocd_fops;
 666         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 667         set_capacity(gendisk, 0);
 668         gendisk->private_data = d;
 669         d->viocd_disk = gendisk;
 670         d->dev = &vdev->dev;
 671         gendisk->driverfs_dev = d->dev;
 672         add_disk(gendisk);
 673
 674         return 0;
 675 }
 676
 677 static int viocd_remove(struct vio_dev *vdev)
 678 {
 679         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 680
 681         if (unregister_cdrom(&d->viocd_info) != 0)
 682                 printk(VIOCD_KERN_WARNING
 683                                 "Cannot unregister viocd CD-ROM %s!\n",
 684                                 d->viocd_info.name);
 685         del_gendisk(d->viocd_disk);
 686         put_disk(d->viocd_disk);
 687         return 0;
 688 }
 689
 690 /**
 691  * viocd_device_table: Used by vio.c to match devices that we
 692  * support.
 693  */
 694 static struct vio_device_id viocd_device_table[] __devinitdata = {
 695         { "viocd", "" },
 696         { 0, }
 697 };
 698
 699 MODULE_DEVICE_TABLE(vio, viocd_device_table);
 700 static struct vio_driver viocd_driver = {
 701         .name = "viocd",
 702         .id_table = viocd_device_table,
 703         .probe = viocd_probe,
 704         .remove = viocd_remove
 705 };
 706
 707 static int __init viocd_init(void)
 708 {
 709         struct proc_dir_entry *e;
 710         int ret = 0;
 711
 712         if (viopath_hostLp == HvLpIndexInvalid) {
 713                 vio_set_hostlp();
 714                 /* If we don't have a host, bail out */
 715                 if (viopath_hostLp == HvLpIndexInvalid)
 716                         return -ENODEV;
 717         }
 718
 719         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
 720                         viopath_hostLp);
 721
 722         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 723                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
 724                                 VIOCD_MAJOR, VIOCD_DEVICE);
 725                 return -EIO;
 726         }
 727
 728         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 729                         MAX_CD_REQ + 2);
 730         if (ret) {
 731                 printk(VIOCD_KERN_WARNING
 732                                 "error opening path to host partition %d\n",
 733                                 viopath_hostLp);
 734                 goto out_unregister;
 735         }
 736
 737         /* Initialize our request handler */
 738         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 739
 740         get_viocd_info();
 741         if (viocd_numdev == 0)
 742                 goto out_undo_vio;
 743
 744         spin_lock_init(&viocd_reqlock);
 745         viocd_queue = blk_init_queue(do_viocd_request, &viocd_reqlock);
 746         if (viocd_queue == NULL) {
 747                 ret = -ENOMEM;
 748                 goto out_free_info;
 749         }
 750         blk_queue_max_hw_segments(viocd_queue, 1);
 751         blk_queue_max_phys_segments(viocd_queue, 1);
 752         blk_queue_max_sectors(viocd_queue, 4096 / 512);
 753
 754         ret = vio_register_driver(&viocd_driver);
 755         if (ret)
 756                 goto out_cleanup_queue;
 757
 758         e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
 759         if (e) {
 760                 e->owner = THIS_MODULE;
 761                 e->proc_fops = &proc_viocd_operations;
 762         }
 763
 764         return 0;
 765
 766 out_cleanup_queue:
 767         blk_cleanup_queue(viocd_queue);
 768 out_free_info:
 769         dma_free_coherent(iSeries_vio_dev,
 770                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 771                         viocd_unitinfo, unitinfo_dmaaddr);
 772 out_undo_vio:
 773         vio_clearHandler(viomajorsubtype_cdio);
 774         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 775 out_unregister:
 776         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 777         return ret;
 778 }
 779
 780 static void __exit viocd_exit(void)
 781 {
 782         remove_proc_entry("iSeries/viocd", NULL);
 783         vio_unregister_driver(&viocd_driver);
 784         blk_cleanup_queue(viocd_queue);
 785         if (viocd_unitinfo != NULL)
 786                 dma_free_coherent(iSeries_vio_dev,
 787                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 788                                 viocd_unitinfo, unitinfo_dmaaddr);
 789         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 790         vio_clearHandler(viomajorsubtype_cdio);
 791         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 792 }
 793
 794 module_init(viocd_init);
 795 module_exit(viocd_exit);
 796 MODULE_LICENSE("GPL");