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