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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / cdrom / viocd.c
blobfcca26c89bbccfa5803680bc0b5b5d417ced3b44
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");
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