Linux-2.6.12-rc2
[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
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 spinlock_t viocd_reqlock;
158
159 #define MAX_CD_REQ      1
160
161 /* procfs support */
162 static int proc_viocd_show(struct seq_file *m, void *v)
163 {
164         int i;
165
166         for (i = 0; i < viocd_numdev; i++) {
167                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
168                                 "type %4.4s, model %3.3s\n",
169                                 i, viocd_unitinfo[i].rsrcname,
170                                 viocd_unitinfo[i].type,
171                                 viocd_unitinfo[i].model);
172         }
173         return 0;
174 }
175
176 static int proc_viocd_open(struct inode *inode, struct file *file)
177 {
178         return single_open(file, proc_viocd_show, NULL);
179 }
180
181 static struct file_operations proc_viocd_operations = {
182         .open           = proc_viocd_open,
183         .read           = seq_read,
184         .llseek         = seq_lseek,
185         .release        = single_release,
186 };
187
188 static int viocd_blk_open(struct inode *inode, struct file *file)
189 {
190         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
191         return cdrom_open(&di->viocd_info, inode, file);
192 }
193
194 static int viocd_blk_release(struct inode *inode, struct file *file)
195 {
196         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
197         return cdrom_release(&di->viocd_info, file);
198 }
199
200 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
201                 unsigned cmd, unsigned long arg)
202 {
203         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
204         return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
205 }
206
207 static int viocd_blk_media_changed(struct gendisk *disk)
208 {
209         struct disk_info *di = disk->private_data;
210         return cdrom_media_changed(&di->viocd_info);
211 }
212
213 struct block_device_operations viocd_fops = {
214         .owner =                THIS_MODULE,
215         .open =                 viocd_blk_open,
216         .release =              viocd_blk_release,
217         .ioctl =                viocd_blk_ioctl,
218         .media_changed =        viocd_blk_media_changed,
219 };
220
221 /* Get info on CD devices from OS/400 */
222 static void __init get_viocd_info(void)
223 {
224         HvLpEvent_Rc hvrc;
225         int i;
226         struct viocd_waitevent we;
227
228         viocd_unitinfo = dma_alloc_coherent(iSeries_vio_dev,
229                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
230                         &unitinfo_dmaaddr, GFP_ATOMIC);
231         if (viocd_unitinfo == NULL) {
232                 printk(VIOCD_KERN_WARNING "error allocating unitinfo\n");
233                 return;
234         }
235
236         memset(viocd_unitinfo, 0, sizeof(*viocd_unitinfo) * VIOCD_MAX_CD);
237
238         init_completion(&we.com);
239
240         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
241                         HvLpEvent_Type_VirtualIo,
242                         viomajorsubtype_cdio | viocdgetinfo,
243                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
244                         viopath_sourceinst(viopath_hostLp),
245                         viopath_targetinst(viopath_hostLp),
246                         (u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
247                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD, 0);
248         if (hvrc != HvLpEvent_Rc_Good) {
249                 printk(VIOCD_KERN_WARNING "cdrom error sending event. rc %d\n",
250                                 (int)hvrc);
251                 goto error_ret;
252         }
253
254         wait_for_completion(&we.com);
255
256         if (we.rc) {
257                 const struct vio_error_entry *err =
258                         vio_lookup_rc(viocd_err_table, we.sub_result);
259                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on getinfo: %s\n",
260                                 we.rc, we.sub_result, err->msg);
261                 goto error_ret;
262         }
263
264         for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++)
265                 viocd_numdev++;
266
267 error_ret:
268         if (viocd_numdev == 0) {
269                 dma_free_coherent(iSeries_vio_dev,
270                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
271                                 viocd_unitinfo, unitinfo_dmaaddr);
272                 viocd_unitinfo = NULL;
273         }
274 }
275
276 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
277 {
278         struct disk_info *diskinfo = cdi->handle;
279         int device_no = DEVICE_NR(diskinfo);
280         HvLpEvent_Rc hvrc;
281         struct viocd_waitevent we;
282
283         init_completion(&we.com);
284         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
285                         HvLpEvent_Type_VirtualIo,
286                         viomajorsubtype_cdio | viocdopen,
287                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
288                         viopath_sourceinst(viopath_hostLp),
289                         viopath_targetinst(viopath_hostLp),
290                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
291                         0, 0, 0);
292         if (hvrc != 0) {
293                 printk(VIOCD_KERN_WARNING
294                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
295                                 (int)hvrc);
296                 return -EIO;
297         }
298
299         wait_for_completion(&we.com);
300
301         if (we.rc) {
302                 const struct vio_error_entry *err =
303                         vio_lookup_rc(viocd_err_table, we.sub_result);
304                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
305                                 we.rc, we.sub_result, err->msg);
306                 return -err->errno;
307         }
308
309         return 0;
310 }
311
312 static void viocd_release(struct cdrom_device_info *cdi)
313 {
314         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
315         HvLpEvent_Rc hvrc;
316
317         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
318                         HvLpEvent_Type_VirtualIo,
319                         viomajorsubtype_cdio | viocdclose,
320                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
321                         viopath_sourceinst(viopath_hostLp),
322                         viopath_targetinst(viopath_hostLp), 0,
323                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
324         if (hvrc != 0)
325                 printk(VIOCD_KERN_WARNING
326                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
327                                 (int)hvrc);
328 }
329
330 /* Send a read or write request to OS/400 */
331 static int send_request(struct request *req)
332 {
333         HvLpEvent_Rc hvrc;
334         struct disk_info *diskinfo = req->rq_disk->private_data;
335         u64 len;
336         dma_addr_t dmaaddr;
337         int direction;
338         u16 cmd;
339         struct scatterlist sg;
340
341         BUG_ON(req->nr_phys_segments > 1);
342
343         if (rq_data_dir(req) == READ) {
344                 direction = DMA_FROM_DEVICE;
345                 cmd = viomajorsubtype_cdio | viocdread;
346         } else {
347                 direction = DMA_TO_DEVICE;
348                 cmd = viomajorsubtype_cdio | viocdwrite;
349         }
350
351         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
352                 printk(VIOCD_KERN_WARNING
353                                 "error setting up scatter/gather list\n");
354                 return -1;
355         }
356
357         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
358                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
359                 return -1;
360         }
361         dmaaddr = sg_dma_address(&sg);
362         len = sg_dma_len(&sg);
363
364         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
365                         HvLpEvent_Type_VirtualIo, cmd,
366                         HvLpEvent_AckInd_DoAck,
367                         HvLpEvent_AckType_ImmediateAck,
368                         viopath_sourceinst(viopath_hostLp),
369                         viopath_targetinst(viopath_hostLp),
370                         (u64)req, VIOVERSION << 16,
371                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
372                         (u64)req->sector * 512, len, 0);
373         if (hvrc != HvLpEvent_Rc_Good) {
374                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
375                 return -1;
376         }
377
378         return 0;
379 }
380
381
382 static int rwreq;
383
384 static void do_viocd_request(request_queue_t *q)
385 {
386         struct request *req;
387
388         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
389                 if (!blk_fs_request(req))
390                         end_request(req, 0);
391                 else if (send_request(req) < 0) {
392                         printk(VIOCD_KERN_WARNING
393                                         "unable to send message to OS/400!");
394                         end_request(req, 0);
395                 } else
396                         rwreq++;
397         }
398 }
399
400 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
401 {
402         struct viocd_waitevent we;
403         HvLpEvent_Rc hvrc;
404         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
405
406         init_completion(&we.com);
407
408         /* Send the open event to OS/400 */
409         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
410                         HvLpEvent_Type_VirtualIo,
411                         viomajorsubtype_cdio | viocdcheck,
412                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
413                         viopath_sourceinst(viopath_hostLp),
414                         viopath_targetinst(viopath_hostLp),
415                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
416                         0, 0, 0);
417         if (hvrc != 0) {
418                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
419                                 (int)hvrc);
420                 return -EIO;
421         }
422
423         wait_for_completion(&we.com);
424
425         /* Check the return code.  If bad, assume no change */
426         if (we.rc) {
427                 const struct vio_error_entry *err =
428                         vio_lookup_rc(viocd_err_table, we.sub_result);
429                 printk(VIOCD_KERN_WARNING
430                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
431                                 we.rc, we.sub_result, err->msg);
432                 return 0;
433         }
434
435         return we.changed;
436 }
437
438 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
439 {
440         HvLpEvent_Rc hvrc;
441         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
442         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
443         u64 flags = !!locking;
444         struct viocd_waitevent we;
445
446         init_completion(&we.com);
447
448         /* Send the lockdoor event to OS/400 */
449         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
450                         HvLpEvent_Type_VirtualIo,
451                         viomajorsubtype_cdio | viocdlockdoor,
452                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
453                         viopath_sourceinst(viopath_hostLp),
454                         viopath_targetinst(viopath_hostLp),
455                         (u64)&we, VIOVERSION << 16,
456                         (device_no << 48) | (flags << 32), 0, 0, 0);
457         if (hvrc != 0) {
458                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
459                                 (int)hvrc);
460                 return -EIO;
461         }
462
463         wait_for_completion(&we.com);
464
465         if (we.rc != 0)
466                 return -EIO;
467         return 0;
468 }
469
470 static int viocd_packet(struct cdrom_device_info *cdi,
471                 struct packet_command *cgc)
472 {
473         unsigned int buflen = cgc->buflen;
474         int ret = -EIO;
475
476         switch (cgc->cmd[0]) {
477         case GPCMD_READ_DISC_INFO:
478                 {
479                         disc_information *di = (disc_information *)cgc->buffer;
480
481                         if (buflen >= 2) {
482                                 di->disc_information_length = cpu_to_be16(1);
483                                 ret = 0;
484                         }
485                         if (buflen >= 3)
486                                 di->erasable =
487                                         (cdi->ops->capability & ~cdi->mask
488                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
489                 }
490                 break;
491         default:
492                 if (cgc->sense) {
493                         /* indicate Unknown code */
494                         cgc->sense->sense_key = 0x05;
495                         cgc->sense->asc = 0x20;
496                         cgc->sense->ascq = 0x00;
497                 }
498                 break;
499         }
500
501         cgc->stat = ret;
502         return ret;
503 }
504
505 static void restart_all_queues(int first_index)
506 {
507         int i;
508
509         for (i = first_index + 1; i < viocd_numdev; i++)
510                 if (viocd_diskinfo[i].viocd_disk)
511                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
512         for (i = 0; i <= first_index; i++)
513                 if (viocd_diskinfo[i].viocd_disk)
514                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
515 }
516
517 /* This routine handles incoming CD LP events */
518 static void vio_handle_cd_event(struct HvLpEvent *event)
519 {
520         struct viocdlpevent *bevent;
521         struct viocd_waitevent *pwe;
522         struct disk_info *di;
523         unsigned long flags;
524         struct request *req;
525
526
527         if (event == NULL)
528                 /* Notification that a partition went away! */
529                 return;
530         /* First, we should NEVER get an int here...only acks */
531         if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
532                 printk(VIOCD_KERN_WARNING
533                                 "Yikes! got an int in viocd event handler!\n");
534                 if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
535                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
536                         HvCallEvent_ackLpEvent(event);
537                 }
538         }
539
540         bevent = (struct viocdlpevent *)event;
541
542         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
543         case viocdopen:
544                 if (event->xRc == 0) {
545                         di = &viocd_diskinfo[bevent->disk];
546                         blk_queue_hardsect_size(di->viocd_disk->queue,
547                                         bevent->block_size);
548                         set_capacity(di->viocd_disk,
549                                         bevent->media_size *
550                                         bevent->block_size / 512);
551                 }
552                 /* FALLTHROUGH !! */
553         case viocdgetinfo:
554         case viocdlockdoor:
555                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
556 return_complete:
557                 pwe->rc = event->xRc;
558                 pwe->sub_result = bevent->sub_result;
559                 complete(&pwe->com);
560                 break;
561
562         case viocdcheck:
563                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
564                 pwe->changed = bevent->flags;
565                 goto return_complete;
566
567         case viocdclose:
568                 break;
569
570         case viocdwrite:
571         case viocdread:
572                 /*
573                  * Since this is running in interrupt mode, we need to
574                  * make sure we're not stepping on any global I/O operations
575                  */
576                 di = &viocd_diskinfo[bevent->disk];
577                 spin_lock_irqsave(&viocd_reqlock, flags);
578                 dma_unmap_single(di->dev, bevent->token, bevent->len,
579                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
580                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
581                 req = (struct request *)bevent->event.xCorrelationToken;
582                 rwreq--;
583
584                 if (event->xRc != HvLpEvent_Rc_Good) {
585                         const struct vio_error_entry *err =
586                                 vio_lookup_rc(viocd_err_table,
587                                                 bevent->sub_result);
588                         printk(VIOCD_KERN_WARNING "request %p failed "
589                                         "with rc %d:0x%04X: %s\n",
590                                         req, event->xRc,
591                                         bevent->sub_result, err->msg);
592                         end_request(req, 0);
593                 } else
594                         end_request(req, 1);
595
596                 /* restart handling of incoming requests */
597                 spin_unlock_irqrestore(&viocd_reqlock, flags);
598                 restart_all_queues(bevent->disk);
599                 break;
600
601         default:
602                 printk(VIOCD_KERN_WARNING
603                                 "message with invalid subtype %0x04X!\n",
604                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
605                 if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
606                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
607                         HvCallEvent_ackLpEvent(event);
608                 }
609         }
610 }
611
612 static struct cdrom_device_ops viocd_dops = {
613         .open = viocd_open,
614         .release = viocd_release,
615         .media_changed = viocd_media_changed,
616         .lock_door = viocd_lock_door,
617         .generic_packet = viocd_packet,
618         .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
619 };
620
621 static int __init find_capability(const char *type)
622 {
623         struct capability_entry *entry;
624
625         for(entry = capability_table; entry->type; ++entry)
626                 if(!strncmp(entry->type, type, 4))
627                         break;
628         return entry->capability;
629 }
630
631 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
632 {
633         struct gendisk *gendisk;
634         int deviceno;
635         struct disk_info *d;
636         struct cdrom_device_info *c;
637         struct cdrom_info *ci;
638         struct request_queue *q;
639
640         deviceno = vdev->unit_address;
641         if (deviceno >= viocd_numdev)
642                 return -ENODEV;
643
644         d = &viocd_diskinfo[deviceno];
645         c = &d->viocd_info;
646         ci = &viocd_unitinfo[deviceno];
647
648         c->ops = &viocd_dops;
649         c->speed = 4;
650         c->capacity = 1;
651         c->handle = d;
652         c->mask = ~find_capability(ci->type);
653         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
654
655         if (register_cdrom(c) != 0) {
656                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
657                                 c->name);
658                 goto out;
659         }
660         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
661                         "type %4.4s, model %3.3s\n",
662                         c->name, ci->rsrcname, ci->type, ci->model);
663         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
664         if (q == NULL) {
665                 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
666                                 c->name);
667                 goto out_unregister_cdrom;
668         }
669         gendisk = alloc_disk(1);
670         if (gendisk == NULL) {
671                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
672                                 c->name);
673                 goto out_cleanup_queue;
674         }
675         gendisk->major = VIOCD_MAJOR;
676         gendisk->first_minor = deviceno;
677         strncpy(gendisk->disk_name, c->name,
678                         sizeof(gendisk->disk_name));
679         snprintf(gendisk->devfs_name, sizeof(gendisk->devfs_name),
680                         VIOCD_DEVICE_DEVFS "%d", deviceno);
681         blk_queue_max_hw_segments(q, 1);
682         blk_queue_max_phys_segments(q, 1);
683         blk_queue_max_sectors(q, 4096 / 512);
684         gendisk->queue = q;
685         gendisk->fops = &viocd_fops;
686         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
687         set_capacity(gendisk, 0);
688         gendisk->private_data = d;
689         d->viocd_disk = gendisk;
690         d->dev = &vdev->dev;
691         gendisk->driverfs_dev = d->dev;
692         add_disk(gendisk);
693         return 0;
694
695 out_cleanup_queue:
696         blk_cleanup_queue(q);
697 out_unregister_cdrom:
698         unregister_cdrom(c);
699 out:
700         return -ENODEV;
701 }
702
703 static int viocd_remove(struct vio_dev *vdev)
704 {
705         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
706
707         if (unregister_cdrom(&d->viocd_info) != 0)
708                 printk(VIOCD_KERN_WARNING
709                                 "Cannot unregister viocd CD-ROM %s!\n",
710                                 d->viocd_info.name);
711         del_gendisk(d->viocd_disk);
712         blk_cleanup_queue(d->viocd_disk->queue);
713         put_disk(d->viocd_disk);
714         return 0;
715 }
716
717 /**
718  * viocd_device_table: Used by vio.c to match devices that we
719  * support.
720  */
721 static struct vio_device_id viocd_device_table[] __devinitdata = {
722         { "viocd", "" },
723         { 0, }
724 };
725
726 MODULE_DEVICE_TABLE(vio, viocd_device_table);
727 static struct vio_driver viocd_driver = {
728         .name = "viocd",
729         .id_table = viocd_device_table,
730         .probe = viocd_probe,
731         .remove = viocd_remove
732 };
733
734 static int __init viocd_init(void)
735 {
736         struct proc_dir_entry *e;
737         int ret = 0;
738
739         if (viopath_hostLp == HvLpIndexInvalid) {
740                 vio_set_hostlp();
741                 /* If we don't have a host, bail out */
742                 if (viopath_hostLp == HvLpIndexInvalid)
743                         return -ENODEV;
744         }
745
746         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
747                         viopath_hostLp);
748
749         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
750                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
751                                 VIOCD_MAJOR, VIOCD_DEVICE);
752                 return -EIO;
753         }
754
755         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
756                         MAX_CD_REQ + 2);
757         if (ret) {
758                 printk(VIOCD_KERN_WARNING
759                                 "error opening path to host partition %d\n",
760                                 viopath_hostLp);
761                 goto out_unregister;
762         }
763
764         /* Initialize our request handler */
765         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
766
767         get_viocd_info();
768
769         spin_lock_init(&viocd_reqlock);
770
771         ret = vio_register_driver(&viocd_driver);
772         if (ret)
773                 goto out_free_info;
774
775         e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
776         if (e) {
777                 e->owner = THIS_MODULE;
778                 e->proc_fops = &proc_viocd_operations;
779         }
780
781         return 0;
782
783 out_free_info:
784         dma_free_coherent(iSeries_vio_dev,
785                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
786                         viocd_unitinfo, unitinfo_dmaaddr);
787         vio_clearHandler(viomajorsubtype_cdio);
788         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
789 out_unregister:
790         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
791         return ret;
792 }
793
794 static void __exit viocd_exit(void)
795 {
796         remove_proc_entry("iSeries/viocd", NULL);
797         vio_unregister_driver(&viocd_driver);
798         if (viocd_unitinfo != NULL)
799                 dma_free_coherent(iSeries_vio_dev,
800                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
801                                 viocd_unitinfo, unitinfo_dmaaddr);
802         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
803         vio_clearHandler(viomajorsubtype_cdio);
804         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
805 }
806
807 module_init(viocd_init);
808 module_exit(viocd_exit);
809 MODULE_LICENSE("GPL");