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/vio.h>
  46 #include <asm/scatterlist.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 struct viocdlpevent {
  60         struct HvLpEvent        event;
  61         u32                     reserved;
  62         u16                     version;
  63         u16                     sub_result;
  64         u16                     disk;
  65         u16                     flags;
  66         u32                     token;
  67         u64                     offset;         /* On open, max number of disks */
  68         u64                     len;            /* On open, size of the disk */
  69         u32                     block_size;     /* Only set on open */
  70         u32                     media_size;     /* Only set on open */
  71 };
  72
  73 enum viocdsubtype {
  74         viocdopen = 0x0001,
  75         viocdclose = 0x0002,
  76         viocdread = 0x0003,
  77         viocdwrite = 0x0004,
  78         viocdlockdoor = 0x0005,
  79         viocdgetinfo = 0x0006,
  80         viocdcheck = 0x0007
  81 };
  82
  83 /*
  84  * Should probably make this a module parameter....sigh
  85  */
  86 #define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
  87
  88 static const struct vio_error_entry viocd_err_table[] = {
  89         {0x0201, EINVAL, "Invalid Range"},
  90         {0x0202, EINVAL, "Invalid Token"},
  91         {0x0203, EIO, "DMA Error"},
  92         {0x0204, EIO, "Use Error"},
  93         {0x0205, EIO, "Release Error"},
  94         {0x0206, EINVAL, "Invalid CD"},
  95         {0x020C, EROFS, "Read Only Device"},
  96         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
  97         {0x020E, EIO, "Optical System Error (Varied Off?)"},
  98         {0x02FF, EIO, "Internal Error"},
  99         {0x3010, EIO, "Changed Volume"},
 100         {0xC100, EIO, "Optical System Error"},
 101         {0x0000, 0, NULL},
 102 };
 103
 104 /*
 105  * This is the structure we use to exchange info between driver and interrupt
 106  * handler
 107  */
 108 struct viocd_waitevent {
 109         struct completion       com;
 110         int                     rc;
 111         u16                     sub_result;
 112         int                     changed;
 113 };
 114
 115 /* this is a lookup table for the true capabilities of a device */
 116 struct capability_entry {
 117         char    *type;
 118         int     capability;
 119 };
 120
 121 static struct capability_entry capability_table[] __initdata = {
 122         { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 123         { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 124         { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 125         { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 126         { "6321", CDC_LOCK },
 127         { "632B", 0 },
 128         { NULL  , CDC_LOCK },
 129 };
 130
 131 /* These are our internal structures for keeping track of devices */
 132 static int viocd_numdev;
 133
 134 struct cdrom_info {
 135         char    rsrcname[10];
 136         char    type[4];
 137         char    model[3];
 138 };
 139
 140 struct disk_info {
 141         struct gendisk                  *viocd_disk;
 142         struct cdrom_device_info        viocd_info;
 143         struct device                   *dev;
 144         struct cdrom_info               unitinfo;
 145 };
 146 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 147
 148 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
 149
 150 static spinlock_t viocd_reqlock;
 151
 152 #define MAX_CD_REQ      1
 153
 154 /* procfs support */
 155 static int proc_viocd_show(struct seq_file *m, void *v)
 156 {
 157         int i;
 158
 159         for (i = 0; i < viocd_numdev; i++) {
 160                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
 161                                 "type %4.4s, model %3.3s\n",
 162                                 i, viocd_diskinfo[i].unitinfo.rsrcname,
 163                                 viocd_diskinfo[i].unitinfo.type,
 164                                 viocd_diskinfo[i].unitinfo.model);
 165         }
 166         return 0;
 167 }
 168
 169 static int proc_viocd_open(struct inode *inode, struct file *file)
 170 {
 171         return single_open(file, proc_viocd_show, NULL);
 172 }
 173
 174 static const struct file_operations proc_viocd_operations = {
 175         .open           = proc_viocd_open,
 176         .read           = seq_read,
 177         .llseek         = seq_lseek,
 178         .release        = single_release,
 179 };
 180
 181 static int viocd_blk_open(struct inode *inode, struct file *file)
 182 {
 183         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 184         return cdrom_open(&di->viocd_info, inode, file);
 185 }
 186
 187 static int viocd_blk_release(struct inode *inode, struct file *file)
 188 {
 189         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 190         return cdrom_release(&di->viocd_info, file);
 191 }
 192
 193 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
 194                 unsigned cmd, unsigned long arg)
 195 {
 196         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 197         return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
 198 }
 199
 200 static int viocd_blk_media_changed(struct gendisk *disk)
 201 {
 202         struct disk_info *di = disk->private_data;
 203         return cdrom_media_changed(&di->viocd_info);
 204 }
 205
 206 struct block_device_operations viocd_fops = {
 207         .owner =                THIS_MODULE,
 208         .open =                 viocd_blk_open,
 209         .release =              viocd_blk_release,
 210         .ioctl =                viocd_blk_ioctl,
 211         .media_changed =        viocd_blk_media_changed,
 212 };
 213
 214 /* Get info on CD devices from OS/400 */
 215 static void __init get_viocd_info(void)
 216 {
 217         HvLpEvent_Rc hvrc;
 218         int i;
 219         struct viocd_waitevent we;
 220         struct cdrom_info *viocd_unitinfo;
 221         dma_addr_t unitinfo_dmaaddr;
 222
 223         viocd_unitinfo = iseries_hv_alloc(
 224                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 225                         &unitinfo_dmaaddr, GFP_ATOMIC);
 226         if (viocd_unitinfo == NULL) {
 227                 printk(VIOCD_KERN_WARNING "error allocating unitinfo\n");
 228                 return;
 229         }
 230
 231         memset(viocd_unitinfo, 0, sizeof(*viocd_unitinfo) * VIOCD_MAX_CD);
 232
 233         init_completion(&we.com);
 234
 235         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 236                         HvLpEvent_Type_VirtualIo,
 237                         viomajorsubtype_cdio | viocdgetinfo,
 238                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 239                         viopath_sourceinst(viopath_hostLp),
 240                         viopath_targetinst(viopath_hostLp),
 241                         (u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
 242                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD, 0);
 243         if (hvrc != HvLpEvent_Rc_Good) {
 244                 printk(VIOCD_KERN_WARNING "cdrom error sending event. rc %d\n",
 245                                 (int)hvrc);
 246                 goto error_ret;
 247         }
 248
 249         wait_for_completion(&we.com);
 250
 251         if (we.rc) {
 252                 const struct vio_error_entry *err =
 253                         vio_lookup_rc(viocd_err_table, we.sub_result);
 254                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on getinfo: %s\n",
 255                                 we.rc, we.sub_result, err->msg);
 256                 goto error_ret;
 257         }
 258
 259         for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++) {
 260                 viocd_diskinfo[viocd_numdev].unitinfo = viocd_unitinfo[i];
 261                 viocd_numdev++;
 262         }
 263
 264 error_ret:
 265         iseries_hv_free(sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 266                         viocd_unitinfo, unitinfo_dmaaddr);
 267 }
 268
 269 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 270 {
 271         struct disk_info *diskinfo = cdi->handle;
 272         int device_no = DEVICE_NR(diskinfo);
 273         HvLpEvent_Rc hvrc;
 274         struct viocd_waitevent we;
 275
 276         init_completion(&we.com);
 277         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 278                         HvLpEvent_Type_VirtualIo,
 279                         viomajorsubtype_cdio | viocdopen,
 280                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 281                         viopath_sourceinst(viopath_hostLp),
 282                         viopath_targetinst(viopath_hostLp),
 283                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 284                         0, 0, 0);
 285         if (hvrc != 0) {
 286                 printk(VIOCD_KERN_WARNING
 287                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 288                                 (int)hvrc);
 289                 return -EIO;
 290         }
 291
 292         wait_for_completion(&we.com);
 293
 294         if (we.rc) {
 295                 const struct vio_error_entry *err =
 296                         vio_lookup_rc(viocd_err_table, we.sub_result);
 297                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
 298                                 we.rc, we.sub_result, err->msg);
 299                 return -err->errno;
 300         }
 301
 302         return 0;
 303 }
 304
 305 static void viocd_release(struct cdrom_device_info *cdi)
 306 {
 307         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 308         HvLpEvent_Rc hvrc;
 309
 310         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 311                         HvLpEvent_Type_VirtualIo,
 312                         viomajorsubtype_cdio | viocdclose,
 313                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 314                         viopath_sourceinst(viopath_hostLp),
 315                         viopath_targetinst(viopath_hostLp), 0,
 316                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 317         if (hvrc != 0)
 318                 printk(VIOCD_KERN_WARNING
 319                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 320                                 (int)hvrc);
 321 }
 322
 323 /* Send a read or write request to OS/400 */
 324 static int send_request(struct request *req)
 325 {
 326         HvLpEvent_Rc hvrc;
 327         struct disk_info *diskinfo = req->rq_disk->private_data;
 328         u64 len;
 329         dma_addr_t dmaaddr;
 330         int direction;
 331         u16 cmd;
 332         struct scatterlist sg;
 333
 334         BUG_ON(req->nr_phys_segments > 1);
 335
 336         if (rq_data_dir(req) == READ) {
 337                 direction = DMA_FROM_DEVICE;
 338                 cmd = viomajorsubtype_cdio | viocdread;
 339         } else {
 340                 direction = DMA_TO_DEVICE;
 341                 cmd = viomajorsubtype_cdio | viocdwrite;
 342         }
 343
 344         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 345                 printk(VIOCD_KERN_WARNING
 346                                 "error setting up scatter/gather list\n");
 347                 return -1;
 348         }
 349
 350         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 351                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
 352                 return -1;
 353         }
 354         dmaaddr = sg_dma_address(&sg);
 355         len = sg_dma_len(&sg);
 356
 357         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 358                         HvLpEvent_Type_VirtualIo, cmd,
 359                         HvLpEvent_AckInd_DoAck,
 360                         HvLpEvent_AckType_ImmediateAck,
 361                         viopath_sourceinst(viopath_hostLp),
 362                         viopath_targetinst(viopath_hostLp),
 363                         (u64)req, VIOVERSION << 16,
 364                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 365                         (u64)req->sector * 512, len, 0);
 366         if (hvrc != HvLpEvent_Rc_Good) {
 367                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
 368                 return -1;
 369         }
 370
 371         return 0;
 372 }
 373
 374 static void viocd_end_request(struct request *req, int uptodate)
 375 {
 376         int nsectors = req->hard_nr_sectors;
 377
 378         /*
 379          * Make sure it's fully ended, and ensure that we process
 380          * at least one sector.
 381          */
 382         if (blk_pc_request(req))
 383                 nsectors = (req->data_len + 511) >> 9;
 384         if (!nsectors)
 385                 nsectors = 1;
 386
 387         if (end_that_request_first(req, uptodate, nsectors))
 388                 BUG();
 389         add_disk_randomness(req->rq_disk);
 390         blkdev_dequeue_request(req);
 391         end_that_request_last(req, uptodate);
 392 }
 393
 394 static int rwreq;
 395
 396 static void do_viocd_request(struct request_queue *q)
 397 {
 398         struct request *req;
 399
 400         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
 401                 if (!blk_fs_request(req))
 402                         viocd_end_request(req, 0);
 403                 else if (send_request(req) < 0) {
 404                         printk(VIOCD_KERN_WARNING
 405                                         "unable to send message to OS/400!");
 406                         viocd_end_request(req, 0);
 407                 } else
 408                         rwreq++;
 409         }
 410 }
 411
 412 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 413 {
 414         struct viocd_waitevent we;
 415         HvLpEvent_Rc hvrc;
 416         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 417
 418         init_completion(&we.com);
 419
 420         /* Send the open event to OS/400 */
 421         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 422                         HvLpEvent_Type_VirtualIo,
 423                         viomajorsubtype_cdio | viocdcheck,
 424                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 425                         viopath_sourceinst(viopath_hostLp),
 426                         viopath_targetinst(viopath_hostLp),
 427                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 428                         0, 0, 0);
 429         if (hvrc != 0) {
 430                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 431                                 (int)hvrc);
 432                 return -EIO;
 433         }
 434
 435         wait_for_completion(&we.com);
 436
 437         /* Check the return code.  If bad, assume no change */
 438         if (we.rc) {
 439                 const struct vio_error_entry *err =
 440                         vio_lookup_rc(viocd_err_table, we.sub_result);
 441                 printk(VIOCD_KERN_WARNING
 442                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 443                                 we.rc, we.sub_result, err->msg);
 444                 return 0;
 445         }
 446
 447         return we.changed;
 448 }
 449
 450 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 451 {
 452         HvLpEvent_Rc hvrc;
 453         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 454         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 455         u64 flags = !!locking;
 456         struct viocd_waitevent we;
 457
 458         init_completion(&we.com);
 459
 460         /* Send the lockdoor event to OS/400 */
 461         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 462                         HvLpEvent_Type_VirtualIo,
 463                         viomajorsubtype_cdio | viocdlockdoor,
 464                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 465                         viopath_sourceinst(viopath_hostLp),
 466                         viopath_targetinst(viopath_hostLp),
 467                         (u64)&we, VIOVERSION << 16,
 468                         (device_no << 48) | (flags << 32), 0, 0, 0);
 469         if (hvrc != 0) {
 470                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 471                                 (int)hvrc);
 472                 return -EIO;
 473         }
 474
 475         wait_for_completion(&we.com);
 476
 477         if (we.rc != 0)
 478                 return -EIO;
 479         return 0;
 480 }
 481
 482 static int viocd_packet(struct cdrom_device_info *cdi,
 483                 struct packet_command *cgc)
 484 {
 485         unsigned int buflen = cgc->buflen;
 486         int ret = -EIO;
 487
 488         switch (cgc->cmd[0]) {
 489         case GPCMD_READ_DISC_INFO:
 490                 {
 491                         disc_information *di = (disc_information *)cgc->buffer;
 492
 493                         if (buflen >= 2) {
 494                                 di->disc_information_length = cpu_to_be16(1);
 495                                 ret = 0;
 496                         }
 497                         if (buflen >= 3)
 498                                 di->erasable =
 499                                         (cdi->ops->capability & ~cdi->mask
 500                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
 501                 }
 502                 break;
 503         case GPCMD_GET_CONFIGURATION:
 504                 if (cgc->cmd[3] == CDF_RWRT) {
 505                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
 506
 507                         if ((buflen >=
 508                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
 509                             (cdi->ops->capability & ~cdi->mask
 510                              & (CDC_DVD_RAM | CDC_RAM))) {
 511                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
 512                                 rfd->curr = 1;
 513                                 ret = 0;
 514                         }
 515                 }
 516                 break;
 517         default:
 518                 if (cgc->sense) {
 519                         /* indicate Unknown code */
 520                         cgc->sense->sense_key = 0x05;
 521                         cgc->sense->asc = 0x20;
 522                         cgc->sense->ascq = 0x00;
 523                 }
 524                 break;
 525         }
 526
 527         cgc->stat = ret;
 528         return ret;
 529 }
 530
 531 static void restart_all_queues(int first_index)
 532 {
 533         int i;
 534
 535         for (i = first_index + 1; i < viocd_numdev; i++)
 536                 if (viocd_diskinfo[i].viocd_disk)
 537                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 538         for (i = 0; i <= first_index; i++)
 539                 if (viocd_diskinfo[i].viocd_disk)
 540                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 541 }
 542
 543 /* This routine handles incoming CD LP events */
 544 static void vio_handle_cd_event(struct HvLpEvent *event)
 545 {
 546         struct viocdlpevent *bevent;
 547         struct viocd_waitevent *pwe;
 548         struct disk_info *di;
 549         unsigned long flags;
 550         struct request *req;
 551
 552
 553         if (event == NULL)
 554                 /* Notification that a partition went away! */
 555                 return;
 556         /* First, we should NEVER get an int here...only acks */
 557         if (hvlpevent_is_int(event)) {
 558                 printk(VIOCD_KERN_WARNING
 559                                 "Yikes! got an int in viocd event handler!\n");
 560                 if (hvlpevent_need_ack(event)) {
 561                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 562                         HvCallEvent_ackLpEvent(event);
 563                 }
 564         }
 565
 566         bevent = (struct viocdlpevent *)event;
 567
 568         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 569         case viocdopen:
 570                 if (event->xRc == 0) {
 571                         di = &viocd_diskinfo[bevent->disk];
 572                         blk_queue_hardsect_size(di->viocd_disk->queue,
 573                                         bevent->block_size);
 574                         set_capacity(di->viocd_disk,
 575                                         bevent->media_size *
 576                                         bevent->block_size / 512);
 577                 }
 578                 /* FALLTHROUGH !! */
 579         case viocdgetinfo:
 580         case viocdlockdoor:
 581                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 582 return_complete:
 583                 pwe->rc = event->xRc;
 584                 pwe->sub_result = bevent->sub_result;
 585                 complete(&pwe->com);
 586                 break;
 587
 588         case viocdcheck:
 589                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 590                 pwe->changed = bevent->flags;
 591                 goto return_complete;
 592
 593         case viocdclose:
 594                 break;
 595
 596         case viocdwrite:
 597         case viocdread:
 598                 /*
 599                  * Since this is running in interrupt mode, we need to
 600                  * make sure we're not stepping on any global I/O operations
 601                  */
 602                 di = &viocd_diskinfo[bevent->disk];
 603                 spin_lock_irqsave(&viocd_reqlock, flags);
 604                 dma_unmap_single(di->dev, bevent->token, bevent->len,
 605                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 606                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 607                 req = (struct request *)bevent->event.xCorrelationToken;
 608                 rwreq--;
 609
 610                 if (event->xRc != HvLpEvent_Rc_Good) {
 611                         const struct vio_error_entry *err =
 612                                 vio_lookup_rc(viocd_err_table,
 613                                                 bevent->sub_result);
 614                         printk(VIOCD_KERN_WARNING "request %p failed "
 615                                         "with rc %d:0x%04X: %s\n",
 616                                         req, event->xRc,
 617                                         bevent->sub_result, err->msg);
 618                         viocd_end_request(req, 0);
 619                 } else
 620                         viocd_end_request(req, 1);
 621
 622                 /* restart handling of incoming requests */
 623                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 624                 restart_all_queues(bevent->disk);
 625                 break;
 626
 627         default:
 628                 printk(VIOCD_KERN_WARNING
 629                                 "message with invalid subtype %0x04X!\n",
 630                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 631                 if (hvlpevent_need_ack(event)) {
 632                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 633                         HvCallEvent_ackLpEvent(event);
 634                 }
 635         }
 636 }
 637
 638 static struct cdrom_device_ops viocd_dops = {
 639         .open = viocd_open,
 640         .release = viocd_release,
 641         .media_changed = viocd_media_changed,
 642         .lock_door = viocd_lock_door,
 643         .generic_packet = viocd_packet,
 644         .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
 645 };
 646
 647 static int __init find_capability(const char *type)
 648 {
 649         struct capability_entry *entry;
 650
 651         for(entry = capability_table; entry->type; ++entry)
 652                 if(!strncmp(entry->type, type, 4))
 653                         break;
 654         return entry->capability;
 655 }
 656
 657 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 658 {
 659         struct gendisk *gendisk;
 660         int deviceno;
 661         struct disk_info *d;
 662         struct cdrom_device_info *c;
 663         struct cdrom_info *ci;
 664         struct request_queue *q;
 665
 666         deviceno = vdev->unit_address;
 667         if (deviceno >= viocd_numdev)
 668                 return -ENODEV;
 669
 670         d = &viocd_diskinfo[deviceno];
 671         c = &d->viocd_info;
 672         ci = &d->unitinfo;
 673
 674         c->ops = &viocd_dops;
 675         c->speed = 4;
 676         c->capacity = 1;
 677         c->handle = d;
 678         c->mask = ~find_capability(ci->type);
 679         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 680
 681         if (register_cdrom(c) != 0) {
 682                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
 683                                 c->name);
 684                 goto out;
 685         }
 686         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
 687                         "type %4.4s, model %3.3s\n",
 688                         c->name, ci->rsrcname, ci->type, ci->model);
 689         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
 690         if (q == NULL) {
 691                 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
 692                                 c->name);
 693                 goto out_unregister_cdrom;
 694         }
 695         gendisk = alloc_disk(1);
 696         if (gendisk == NULL) {
 697                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
 698                                 c->name);
 699                 goto out_cleanup_queue;
 700         }
 701         gendisk->major = VIOCD_MAJOR;
 702         gendisk->first_minor = deviceno;
 703         strncpy(gendisk->disk_name, c->name,
 704                         sizeof(gendisk->disk_name));
 705         blk_queue_max_hw_segments(q, 1);
 706         blk_queue_max_phys_segments(q, 1);
 707         blk_queue_max_sectors(q, 4096 / 512);
 708         gendisk->queue = q;
 709         gendisk->fops = &viocd_fops;
 710         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 711         set_capacity(gendisk, 0);
 712         gendisk->private_data = d;
 713         d->viocd_disk = gendisk;
 714         d->dev = &vdev->dev;
 715         gendisk->driverfs_dev = d->dev;
 716         add_disk(gendisk);
 717         return 0;
 718
 719 out_cleanup_queue:
 720         blk_cleanup_queue(q);
 721 out_unregister_cdrom:
 722         unregister_cdrom(c);
 723 out:
 724         return -ENODEV;
 725 }
 726
 727 static int viocd_remove(struct vio_dev *vdev)
 728 {
 729         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 730
 731         if (unregister_cdrom(&d->viocd_info) != 0)
 732                 printk(VIOCD_KERN_WARNING
 733                                 "Cannot unregister viocd CD-ROM %s!\n",
 734                                 d->viocd_info.name);
 735         del_gendisk(d->viocd_disk);
 736         blk_cleanup_queue(d->viocd_disk->queue);
 737         put_disk(d->viocd_disk);
 738         return 0;
 739 }
 740
 741 /**
 742  * viocd_device_table: Used by vio.c to match devices that we
 743  * support.
 744  */
 745 static struct vio_device_id viocd_device_table[] __devinitdata = {
 746         { "block", "IBM,iSeries-viocd" },
 747         { "", "" }
 748 };
 749 MODULE_DEVICE_TABLE(vio, viocd_device_table);
 750
 751 static struct vio_driver viocd_driver = {
 752         .id_table = viocd_device_table,
 753         .probe = viocd_probe,
 754         .remove = viocd_remove,
 755         .driver = {
 756                 .name = "viocd",
 757                 .owner = THIS_MODULE,
 758         }
 759 };
 760
 761 static int __init viocd_init(void)
 762 {
 763         struct proc_dir_entry *e;
 764         int ret = 0;
 765
 766         if (!firmware_has_feature(FW_FEATURE_ISERIES))
 767                 return -ENODEV;
 768
 769         if (viopath_hostLp == HvLpIndexInvalid) {
 770                 vio_set_hostlp();
 771                 /* If we don't have a host, bail out */
 772                 if (viopath_hostLp == HvLpIndexInvalid)
 773                         return -ENODEV;
 774         }
 775
 776         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
 777                         viopath_hostLp);
 778
 779         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 780                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
 781                                 VIOCD_MAJOR, VIOCD_DEVICE);
 782                 return -EIO;
 783         }
 784
 785         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 786                         MAX_CD_REQ + 2);
 787         if (ret) {
 788                 printk(VIOCD_KERN_WARNING
 789                                 "error opening path to host partition %d\n",
 790                                 viopath_hostLp);
 791                 goto out_unregister;
 792         }
 793
 794         /* Initialize our request handler */
 795         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 796
 797         get_viocd_info();
 798
 799         spin_lock_init(&viocd_reqlock);
 800
 801         ret = vio_register_driver(&viocd_driver);
 802         if (ret)
 803                 goto out_free_info;
 804
 805         e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
 806         if (e) {
 807                 e->owner = THIS_MODULE;
 808                 e->proc_fops = &proc_viocd_operations;
 809         }
 810
 811         return 0;
 812
 813 out_free_info:
 814         vio_clearHandler(viomajorsubtype_cdio);
 815         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 816 out_unregister:
 817         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 818         return ret;
 819 }
 820
 821 static void __exit viocd_exit(void)
 822 {
 823         remove_proc_entry("iSeries/viocd", NULL);
 824         vio_unregister_driver(&viocd_driver);
 825         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 826         vio_clearHandler(viomajorsubtype_cdio);
 827         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 828 }
 829
 830 module_init(viocd_init);
 831 module_exit(viocd_exit);
 832 MODULE_LICENSE("GPL");