cac06bc1754b327f7e88605c4f1ed838d8187966
[linux-2.6.git] / drivers / cdrom / viocd.c
1 /* -*- linux-c -*-
2  *  drivers/cdrom/viocd.c
3  *
4  *  iSeries Virtual CD Rom
5  *
6  *  Authors: Dave Boutcher <boutcher@us.ibm.com>
7  *           Ryan Arnold <ryanarn@us.ibm.com>
8  *           Colin Devilbiss <devilbis@us.ibm.com>
9  *           Stephen Rothwell <sfr@au1.ibm.com>
10  *
11  * (C) Copyright 2000-2004 IBM Corporation
12  *
13  * This program is free software;  you can redistribute it and/or
14  * modify it under the terms of the GNU General Public License as
15  * published by the Free Software Foundation; either version 2 of the
16  * License, or (at your option) anyu later version.
17  *
18  * This program is distributed in the hope that it will be useful, but
19  * WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
21  * General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software Foundation,
25  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26  *
27  * This routine provides access to CD ROM drives owned and managed by an
28  * OS/400 partition running on the same box as this Linux partition.
29  *
30  * All operations are performed by sending messages back and forth to
31  * the OS/400 partition.
32  */
33
34 #include <linux/major.h>
35 #include <linux/blkdev.h>
36 #include <linux/cdrom.h>
37 #include <linux/errno.h>
38 #include <linux/init.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/module.h>
41 #include <linux/completion.h>
42 #include <linux/proc_fs.h>
43 #include <linux/seq_file.h>
44 #include <linux/scatterlist.h>
45
46 #include <asm/vio.h>
47 #include <asm/iseries/hv_types.h>
48 #include <asm/iseries/hv_lp_event.h>
49 #include <asm/iseries/vio.h>
50 #include <asm/firmware.h>
51
52 #define VIOCD_DEVICE                    "iseries/vcd"
53
54 #define VIOCD_VERS "1.06"
55
56 #define VIOCD_KERN_WARNING              KERN_WARNING "viocd: "
57 #define VIOCD_KERN_INFO                 KERN_INFO "viocd: "
58
59 /*
60  * Should probably make this a module parameter....sigh
61  */
62 #define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
63
64 static const struct vio_error_entry viocd_err_table[] = {
65         {0x0201, EINVAL, "Invalid Range"},
66         {0x0202, EINVAL, "Invalid Token"},
67         {0x0203, EIO, "DMA Error"},
68         {0x0204, EIO, "Use Error"},
69         {0x0205, EIO, "Release Error"},
70         {0x0206, EINVAL, "Invalid CD"},
71         {0x020C, EROFS, "Read Only Device"},
72         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
73         {0x020E, EIO, "Optical System Error (Varied Off?)"},
74         {0x02FF, EIO, "Internal Error"},
75         {0x3010, EIO, "Changed Volume"},
76         {0xC100, EIO, "Optical System Error"},
77         {0x0000, 0, NULL},
78 };
79
80 /*
81  * This is the structure we use to exchange info between driver and interrupt
82  * handler
83  */
84 struct viocd_waitevent {
85         struct completion       com;
86         int                     rc;
87         u16                     sub_result;
88         int                     changed;
89 };
90
91 /* this is a lookup table for the true capabilities of a device */
92 struct capability_entry {
93         char    *type;
94         int     capability;
95 };
96
97 static struct capability_entry capability_table[] __initdata = {
98         { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
99         { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
100         { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
101         { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
102         { "6321", CDC_LOCK },
103         { "632B", 0 },
104         { NULL  , CDC_LOCK },
105 };
106
107 /* These are our internal structures for keeping track of devices */
108 static int viocd_numdev;
109
110 struct disk_info {
111         struct gendisk                  *viocd_disk;
112         struct cdrom_device_info        viocd_info;
113         struct device                   *dev;
114         const char                      *rsrcname;
115         const char                      *type;
116         const char                      *model;
117 };
118 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
119
120 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
121
122 static spinlock_t viocd_reqlock;
123
124 #define MAX_CD_REQ      1
125
126 /* procfs support */
127 static int proc_viocd_show(struct seq_file *m, void *v)
128 {
129         int i;
130
131         for (i = 0; i < viocd_numdev; i++) {
132                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
133                                 "type %4.4s, model %3.3s\n",
134                                 i, viocd_diskinfo[i].rsrcname,
135                                 viocd_diskinfo[i].type,
136                                 viocd_diskinfo[i].model);
137         }
138         return 0;
139 }
140
141 static int proc_viocd_open(struct inode *inode, struct file *file)
142 {
143         return single_open(file, proc_viocd_show, NULL);
144 }
145
146 static const struct file_operations proc_viocd_operations = {
147         .open           = proc_viocd_open,
148         .read           = seq_read,
149         .llseek         = seq_lseek,
150         .release        = single_release,
151 };
152
153 static int viocd_blk_open(struct inode *inode, struct file *file)
154 {
155         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
156         return cdrom_open(&di->viocd_info, inode, file);
157 }
158
159 static int viocd_blk_release(struct inode *inode, struct file *file)
160 {
161         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
162         return cdrom_release(&di->viocd_info, file);
163 }
164
165 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
166                 unsigned cmd, unsigned long arg)
167 {
168         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
169         return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
170 }
171
172 static int viocd_blk_media_changed(struct gendisk *disk)
173 {
174         struct disk_info *di = disk->private_data;
175         return cdrom_media_changed(&di->viocd_info);
176 }
177
178 struct block_device_operations viocd_fops = {
179         .owner =                THIS_MODULE,
180         .open =                 viocd_blk_open,
181         .release =              viocd_blk_release,
182         .ioctl =                viocd_blk_ioctl,
183         .media_changed =        viocd_blk_media_changed,
184 };
185
186 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
187 {
188         struct disk_info *diskinfo = cdi->handle;
189         int device_no = DEVICE_NR(diskinfo);
190         HvLpEvent_Rc hvrc;
191         struct viocd_waitevent we;
192
193         init_completion(&we.com);
194         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
195                         HvLpEvent_Type_VirtualIo,
196                         viomajorsubtype_cdio | viocdopen,
197                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
198                         viopath_sourceinst(viopath_hostLp),
199                         viopath_targetinst(viopath_hostLp),
200                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
201                         0, 0, 0);
202         if (hvrc != 0) {
203                 printk(VIOCD_KERN_WARNING
204                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
205                                 (int)hvrc);
206                 return -EIO;
207         }
208
209         wait_for_completion(&we.com);
210
211         if (we.rc) {
212                 const struct vio_error_entry *err =
213                         vio_lookup_rc(viocd_err_table, we.sub_result);
214                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
215                                 we.rc, we.sub_result, err->msg);
216                 return -err->errno;
217         }
218
219         return 0;
220 }
221
222 static void viocd_release(struct cdrom_device_info *cdi)
223 {
224         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
225         HvLpEvent_Rc hvrc;
226
227         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
228                         HvLpEvent_Type_VirtualIo,
229                         viomajorsubtype_cdio | viocdclose,
230                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
231                         viopath_sourceinst(viopath_hostLp),
232                         viopath_targetinst(viopath_hostLp), 0,
233                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
234         if (hvrc != 0)
235                 printk(VIOCD_KERN_WARNING
236                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
237                                 (int)hvrc);
238 }
239
240 /* Send a read or write request to OS/400 */
241 static int send_request(struct request *req)
242 {
243         HvLpEvent_Rc hvrc;
244         struct disk_info *diskinfo = req->rq_disk->private_data;
245         u64 len;
246         dma_addr_t dmaaddr;
247         int direction;
248         u16 cmd;
249         struct scatterlist sg;
250
251         BUG_ON(req->nr_phys_segments > 1);
252
253         if (rq_data_dir(req) == READ) {
254                 direction = DMA_FROM_DEVICE;
255                 cmd = viomajorsubtype_cdio | viocdread;
256         } else {
257                 direction = DMA_TO_DEVICE;
258                 cmd = viomajorsubtype_cdio | viocdwrite;
259         }
260
261         sg_init_table(&sg, 1);
262         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
263                 printk(VIOCD_KERN_WARNING
264                                 "error setting up scatter/gather list\n");
265                 return -1;
266         }
267
268         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
269                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
270                 return -1;
271         }
272         dmaaddr = sg_dma_address(&sg);
273         len = sg_dma_len(&sg);
274
275         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
276                         HvLpEvent_Type_VirtualIo, cmd,
277                         HvLpEvent_AckInd_DoAck,
278                         HvLpEvent_AckType_ImmediateAck,
279                         viopath_sourceinst(viopath_hostLp),
280                         viopath_targetinst(viopath_hostLp),
281                         (u64)req, VIOVERSION << 16,
282                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
283                         (u64)req->sector * 512, len, 0);
284         if (hvrc != HvLpEvent_Rc_Good) {
285                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
286                 return -1;
287         }
288
289         return 0;
290 }
291
292 static void viocd_end_request(struct request *req, int error)
293 {
294         int nsectors = req->hard_nr_sectors;
295
296         /*
297          * Make sure it's fully ended, and ensure that we process
298          * at least one sector.
299          */
300         if (blk_pc_request(req))
301                 nsectors = (req->data_len + 511) >> 9;
302         if (!nsectors)
303                 nsectors = 1;
304
305         if (__blk_end_request(req, error, nsectors << 9))
306                 BUG();
307 }
308
309 static int rwreq;
310
311 static void do_viocd_request(struct request_queue *q)
312 {
313         struct request *req;
314
315         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
316                 if (!blk_fs_request(req))
317                         viocd_end_request(req, -EIO);
318                 else if (send_request(req) < 0) {
319                         printk(VIOCD_KERN_WARNING
320                                         "unable to send message to OS/400!");
321                         viocd_end_request(req, -EIO);
322                 } else
323                         rwreq++;
324         }
325 }
326
327 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
328 {
329         struct viocd_waitevent we;
330         HvLpEvent_Rc hvrc;
331         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
332
333         init_completion(&we.com);
334
335         /* Send the open event to OS/400 */
336         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
337                         HvLpEvent_Type_VirtualIo,
338                         viomajorsubtype_cdio | viocdcheck,
339                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
340                         viopath_sourceinst(viopath_hostLp),
341                         viopath_targetinst(viopath_hostLp),
342                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
343                         0, 0, 0);
344         if (hvrc != 0) {
345                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
346                                 (int)hvrc);
347                 return -EIO;
348         }
349
350         wait_for_completion(&we.com);
351
352         /* Check the return code.  If bad, assume no change */
353         if (we.rc) {
354                 const struct vio_error_entry *err =
355                         vio_lookup_rc(viocd_err_table, we.sub_result);
356                 printk(VIOCD_KERN_WARNING
357                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
358                                 we.rc, we.sub_result, err->msg);
359                 return 0;
360         }
361
362         return we.changed;
363 }
364
365 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
366 {
367         HvLpEvent_Rc hvrc;
368         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
369         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
370         u64 flags = !!locking;
371         struct viocd_waitevent we;
372
373         init_completion(&we.com);
374
375         /* Send the lockdoor event to OS/400 */
376         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
377                         HvLpEvent_Type_VirtualIo,
378                         viomajorsubtype_cdio | viocdlockdoor,
379                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
380                         viopath_sourceinst(viopath_hostLp),
381                         viopath_targetinst(viopath_hostLp),
382                         (u64)&we, VIOVERSION << 16,
383                         (device_no << 48) | (flags << 32), 0, 0, 0);
384         if (hvrc != 0) {
385                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
386                                 (int)hvrc);
387                 return -EIO;
388         }
389
390         wait_for_completion(&we.com);
391
392         if (we.rc != 0)
393                 return -EIO;
394         return 0;
395 }
396
397 static int viocd_packet(struct cdrom_device_info *cdi,
398                 struct packet_command *cgc)
399 {
400         unsigned int buflen = cgc->buflen;
401         int ret = -EIO;
402
403         switch (cgc->cmd[0]) {
404         case GPCMD_READ_DISC_INFO:
405                 {
406                         disc_information *di = (disc_information *)cgc->buffer;
407
408                         if (buflen >= 2) {
409                                 di->disc_information_length = cpu_to_be16(1);
410                                 ret = 0;
411                         }
412                         if (buflen >= 3)
413                                 di->erasable =
414                                         (cdi->ops->capability & ~cdi->mask
415                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
416                 }
417                 break;
418         case GPCMD_GET_CONFIGURATION:
419                 if (cgc->cmd[3] == CDF_RWRT) {
420                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
421
422                         if ((buflen >=
423                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
424                             (cdi->ops->capability & ~cdi->mask
425                              & (CDC_DVD_RAM | CDC_RAM))) {
426                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
427                                 rfd->curr = 1;
428                                 ret = 0;
429                         }
430                 }
431                 break;
432         default:
433                 if (cgc->sense) {
434                         /* indicate Unknown code */
435                         cgc->sense->sense_key = 0x05;
436                         cgc->sense->asc = 0x20;
437                         cgc->sense->ascq = 0x00;
438                 }
439                 break;
440         }
441
442         cgc->stat = ret;
443         return ret;
444 }
445
446 static void restart_all_queues(int first_index)
447 {
448         int i;
449
450         for (i = first_index + 1; i < viocd_numdev; i++)
451                 if (viocd_diskinfo[i].viocd_disk)
452                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
453         for (i = 0; i <= first_index; i++)
454                 if (viocd_diskinfo[i].viocd_disk)
455                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
456 }
457
458 /* This routine handles incoming CD LP events */
459 static void vio_handle_cd_event(struct HvLpEvent *event)
460 {
461         struct viocdlpevent *bevent;
462         struct viocd_waitevent *pwe;
463         struct disk_info *di;
464         unsigned long flags;
465         struct request *req;
466
467
468         if (event == NULL)
469                 /* Notification that a partition went away! */
470                 return;
471         /* First, we should NEVER get an int here...only acks */
472         if (hvlpevent_is_int(event)) {
473                 printk(VIOCD_KERN_WARNING
474                                 "Yikes! got an int in viocd event handler!\n");
475                 if (hvlpevent_need_ack(event)) {
476                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
477                         HvCallEvent_ackLpEvent(event);
478                 }
479         }
480
481         bevent = (struct viocdlpevent *)event;
482
483         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
484         case viocdopen:
485                 if (event->xRc == 0) {
486                         di = &viocd_diskinfo[bevent->disk];
487                         blk_queue_hardsect_size(di->viocd_disk->queue,
488                                         bevent->block_size);
489                         set_capacity(di->viocd_disk,
490                                         bevent->media_size *
491                                         bevent->block_size / 512);
492                 }
493                 /* FALLTHROUGH !! */
494         case viocdlockdoor:
495                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
496 return_complete:
497                 pwe->rc = event->xRc;
498                 pwe->sub_result = bevent->sub_result;
499                 complete(&pwe->com);
500                 break;
501
502         case viocdcheck:
503                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
504                 pwe->changed = bevent->flags;
505                 goto return_complete;
506
507         case viocdclose:
508                 break;
509
510         case viocdwrite:
511         case viocdread:
512                 /*
513                  * Since this is running in interrupt mode, we need to
514                  * make sure we're not stepping on any global I/O operations
515                  */
516                 di = &viocd_diskinfo[bevent->disk];
517                 spin_lock_irqsave(&viocd_reqlock, flags);
518                 dma_unmap_single(di->dev, bevent->token, bevent->len,
519                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
520                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
521                 req = (struct request *)bevent->event.xCorrelationToken;
522                 rwreq--;
523
524                 if (event->xRc != HvLpEvent_Rc_Good) {
525                         const struct vio_error_entry *err =
526                                 vio_lookup_rc(viocd_err_table,
527                                                 bevent->sub_result);
528                         printk(VIOCD_KERN_WARNING "request %p failed "
529                                         "with rc %d:0x%04X: %s\n",
530                                         req, event->xRc,
531                                         bevent->sub_result, err->msg);
532                         viocd_end_request(req, -EIO);
533                 } else
534                         viocd_end_request(req, 0);
535
536                 /* restart handling of incoming requests */
537                 spin_unlock_irqrestore(&viocd_reqlock, flags);
538                 restart_all_queues(bevent->disk);
539                 break;
540
541         default:
542                 printk(VIOCD_KERN_WARNING
543                                 "message with invalid subtype %0x04X!\n",
544                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
545                 if (hvlpevent_need_ack(event)) {
546                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
547                         HvCallEvent_ackLpEvent(event);
548                 }
549         }
550 }
551
552 static struct cdrom_device_ops viocd_dops = {
553         .open = viocd_open,
554         .release = viocd_release,
555         .media_changed = viocd_media_changed,
556         .lock_door = viocd_lock_door,
557         .generic_packet = viocd_packet,
558         .capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_GENERIC_PACKET | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_RAM
559 };
560
561 static int find_capability(const char *type)
562 {
563         struct capability_entry *entry;
564
565         for(entry = capability_table; entry->type; ++entry)
566                 if(!strncmp(entry->type, type, 4))
567                         break;
568         return entry->capability;
569 }
570
571 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
572 {
573         struct gendisk *gendisk;
574         int deviceno;
575         struct disk_info *d;
576         struct cdrom_device_info *c;
577         struct request_queue *q;
578         struct device_node *node = vdev->dev.archdata.of_node;
579
580         deviceno = vdev->unit_address;
581         if (deviceno > VIOCD_MAX_CD)
582                 return -ENODEV;
583         if (!node)
584                 return -ENODEV;
585
586         if (deviceno >= viocd_numdev)
587                 viocd_numdev = deviceno + 1;
588
589         d = &viocd_diskinfo[deviceno];
590         d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
591         d->type = of_get_property(node, "linux,vio_type", NULL);
592         d->model = of_get_property(node, "linux,vio_model", NULL);
593
594         c = &d->viocd_info;
595
596         c->ops = &viocd_dops;
597         c->speed = 4;
598         c->capacity = 1;
599         c->handle = d;
600         c->mask = ~find_capability(d->type);
601         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
602
603         if (register_cdrom(c) != 0) {
604                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
605                                 c->name);
606                 goto out;
607         }
608         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
609                         "type %4.4s, model %3.3s\n",
610                         c->name, d->rsrcname, d->type, d->model);
611         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
612         if (q == NULL) {
613                 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
614                                 c->name);
615                 goto out_unregister_cdrom;
616         }
617         gendisk = alloc_disk(1);
618         if (gendisk == NULL) {
619                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
620                                 c->name);
621                 goto out_cleanup_queue;
622         }
623         gendisk->major = VIOCD_MAJOR;
624         gendisk->first_minor = deviceno;
625         strncpy(gendisk->disk_name, c->name,
626                         sizeof(gendisk->disk_name));
627         blk_queue_max_hw_segments(q, 1);
628         blk_queue_max_phys_segments(q, 1);
629         blk_queue_max_sectors(q, 4096 / 512);
630         gendisk->queue = q;
631         gendisk->fops = &viocd_fops;
632         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
633         set_capacity(gendisk, 0);
634         gendisk->private_data = d;
635         d->viocd_disk = gendisk;
636         d->dev = &vdev->dev;
637         gendisk->driverfs_dev = d->dev;
638         add_disk(gendisk);
639         return 0;
640
641 out_cleanup_queue:
642         blk_cleanup_queue(q);
643 out_unregister_cdrom:
644         unregister_cdrom(c);
645 out:
646         return -ENODEV;
647 }
648
649 static int viocd_remove(struct vio_dev *vdev)
650 {
651         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
652
653         if (unregister_cdrom(&d->viocd_info) != 0)
654                 printk(VIOCD_KERN_WARNING
655                                 "Cannot unregister viocd CD-ROM %s!\n",
656                                 d->viocd_info.name);
657         del_gendisk(d->viocd_disk);
658         blk_cleanup_queue(d->viocd_disk->queue);
659         put_disk(d->viocd_disk);
660         return 0;
661 }
662
663 /**
664  * viocd_device_table: Used by vio.c to match devices that we
665  * support.
666  */
667 static struct vio_device_id viocd_device_table[] __devinitdata = {
668         { "block", "IBM,iSeries-viocd" },
669         { "", "" }
670 };
671 MODULE_DEVICE_TABLE(vio, viocd_device_table);
672
673 static struct vio_driver viocd_driver = {
674         .id_table = viocd_device_table,
675         .probe = viocd_probe,
676         .remove = viocd_remove,
677         .driver = {
678                 .name = "viocd",
679                 .owner = THIS_MODULE,
680         }
681 };
682
683 static int __init viocd_init(void)
684 {
685         struct proc_dir_entry *e;
686         int ret = 0;
687
688         if (!firmware_has_feature(FW_FEATURE_ISERIES))
689                 return -ENODEV;
690
691         if (viopath_hostLp == HvLpIndexInvalid) {
692                 vio_set_hostlp();
693                 /* If we don't have a host, bail out */
694                 if (viopath_hostLp == HvLpIndexInvalid)
695                         return -ENODEV;
696         }
697
698         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
699                         viopath_hostLp);
700
701         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
702                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
703                                 VIOCD_MAJOR, VIOCD_DEVICE);
704                 return -EIO;
705         }
706
707         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
708                         MAX_CD_REQ + 2);
709         if (ret) {
710                 printk(VIOCD_KERN_WARNING
711                                 "error opening path to host partition %d\n",
712                                 viopath_hostLp);
713                 goto out_unregister;
714         }
715
716         /* Initialize our request handler */
717         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
718
719         spin_lock_init(&viocd_reqlock);
720
721         ret = vio_register_driver(&viocd_driver);
722         if (ret)
723                 goto out_free_info;
724
725         e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
726         if (e) {
727                 e->owner = THIS_MODULE;
728                 e->proc_fops = &proc_viocd_operations;
729         }
730
731         return 0;
732
733 out_free_info:
734         vio_clearHandler(viomajorsubtype_cdio);
735         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
736 out_unregister:
737         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
738         return ret;
739 }
740
741 static void __exit viocd_exit(void)
742 {
743         remove_proc_entry("iSeries/viocd", NULL);
744         vio_unregister_driver(&viocd_driver);
745         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
746         vio_clearHandler(viomajorsubtype_cdio);
747         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
748 }
749
750 module_init(viocd_init);
751 module_exit(viocd_exit);
752 MODULE_LICENSE("GPL");