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[POWERPC] iSeries: Simplify viocd initialisation
[wandboard.git] / drivers / cdrom / viocd.c
blobb88fdebe77f66b9dbdfacfa957945d7ab962055b
1 /* -*- linux-c -*-
2 * drivers/cdrom/viocd.c
3 *
4 * iSeries Virtual CD Rom
5 *
6 * Authors: Dave Boutcher <boutcher@us.ibm.com>
7 * Ryan Arnold <ryanarn@us.ibm.com>
8 * Colin Devilbiss <devilbis@us.ibm.com>
9 * Stephen Rothwell <sfr@au1.ibm.com>
10 *
11 * (C) Copyright 2000-2004 IBM Corporation
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of the
16 * License, or (at your option) anyu later version.
17 *
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software Foundation,
25 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 *
27 * This routine provides access to CD ROM drives owned and managed by an
28 * OS/400 partition running on the same box as this Linux partition.
29 *
30 * All operations are performed by sending messages back and forth to
31 * the OS/400 partition.
32 */
33
34 #include <linux/major.h>
35 #include <linux/blkdev.h>
36 #include <linux/cdrom.h>
37 #include <linux/errno.h>
38 #include <linux/init.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/module.h>
41 #include <linux/completion.h>
42 #include <linux/proc_fs.h>
43 #include <linux/seq_file.h>
44
45 #include <asm/vio.h>
46 #include <asm/scatterlist.h>
47 #include <asm/iseries/hv_types.h>
48 #include <asm/iseries/hv_lp_event.h>
49 #include <asm/iseries/vio.h>
50 #include <asm/firmware.h>
51
52 #define VIOCD_DEVICE "iseries/vcd"
53
54 #define VIOCD_VERS "1.06"
55
56 #define VIOCD_KERN_WARNING KERN_WARNING "viocd: "
57 #define VIOCD_KERN_INFO KERN_INFO "viocd: "
58
59 struct viocdlpevent {
60 struct HvLpEvent event;
61 u32 reserved;
62 u16 version;
63 u16 sub_result;
64 u16 disk;
65 u16 flags;
66 u32 token;
67 u64 offset; /* On open, max number of disks */
68 u64 len; /* On open, size of the disk */
69 u32 block_size; /* Only set on open */
70 u32 media_size; /* Only set on open */
71 };
72
73 enum viocdsubtype {
74 viocdopen = 0x0001,
75 viocdclose = 0x0002,
76 viocdread = 0x0003,
77 viocdwrite = 0x0004,
78 viocdlockdoor = 0x0005,
79 viocdgetinfo = 0x0006,
80 viocdcheck = 0x0007
81 };
82
83 /*
84 * Should probably make this a module parameter....sigh
85 */
86 #define VIOCD_MAX_CD HVMAXARCHITECTEDVIRTUALCDROMS
87
88 static const struct vio_error_entry viocd_err_table[] = {
89 {0x0201, EINVAL, "Invalid Range"},
90 {0x0202, EINVAL, "Invalid Token"},
91 {0x0203, EIO, "DMA Error"},
92 {0x0204, EIO, "Use Error"},
93 {0x0205, EIO, "Release Error"},
94 {0x0206, EINVAL, "Invalid CD"},
95 {0x020C, EROFS, "Read Only Device"},
96 {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
97 {0x020E, EIO, "Optical System Error (Varied Off?)"},
98 {0x02FF, EIO, "Internal Error"},
99 {0x3010, EIO, "Changed Volume"},
100 {0xC100, EIO, "Optical System Error"},
101 {0x0000, 0, NULL},
102 };
103
104 /*
105 * This is the structure we use to exchange info between driver and interrupt
106 * handler
107 */
108 struct viocd_waitevent {
109 struct completion com;
110 int rc;
111 u16 sub_result;
112 int changed;
113 };
114
115 /* this is a lookup table for the true capabilities of a device */
116 struct capability_entry {
117 char *type;
118 int capability;
119 };
120
121 static struct capability_entry capability_table[] __initdata = {
122 { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
123 { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
124 { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
125 { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
126 { "6321", CDC_LOCK },
127 { "632B", 0 },
128 { NULL , CDC_LOCK },
129 };
130
131 /* These are our internal structures for keeping track of devices */
132 static int viocd_numdev;
133
134 struct cdrom_info {
135 char rsrcname[10];
136 char type[4];
137 char model[3];
138 };
139
140 struct disk_info {
141 struct gendisk *viocd_disk;
142 struct cdrom_device_info viocd_info;
143 struct device *dev;
144 struct cdrom_info unitinfo;
145 };
146 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
147
148 #define DEVICE_NR(di) ((di) - &viocd_diskinfo[0])
149
150 static spinlock_t viocd_reqlock;
151
152 #define MAX_CD_REQ 1
153
154 /* procfs support */
155 static int proc_viocd_show(struct seq_file *m, void *v)
156 {
157 int i;
158
159 for (i = 0; i < viocd_numdev; i++) {
160 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
161 "type %4.4s, model %3.3s\n",
162 i, viocd_diskinfo[i].unitinfo.rsrcname,
163 viocd_diskinfo[i].unitinfo.type,
164 viocd_diskinfo[i].unitinfo.model);
165 }
166 return 0;
167 }
168
169 static int proc_viocd_open(struct inode *inode, struct file *file)
170 {
171 return single_open(file, proc_viocd_show, NULL);
172 }
173
174 static const struct file_operations proc_viocd_operations = {
175 .open = proc_viocd_open,
176 .read = seq_read,
177 .llseek = seq_lseek,
178 .release = single_release,
179 };
180
181 static int viocd_blk_open(struct inode *inode, struct file *file)
182 {
183 struct disk_info *di = inode->i_bdev->bd_disk->private_data;
184 return cdrom_open(&di->viocd_info, inode, file);
185 }
186
187 static int viocd_blk_release(struct inode *inode, struct file *file)
188 {
189 struct disk_info *di = inode->i_bdev->bd_disk->private_data;
190 return cdrom_release(&di->viocd_info, file);
191 }
192
193 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
194 unsigned cmd, unsigned long arg)
195 {
196 struct disk_info *di = inode->i_bdev->bd_disk->private_data;
197 return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
198 }
199
200 static int viocd_blk_media_changed(struct gendisk *disk)
201 {
202 struct disk_info *di = disk->private_data;
203 return cdrom_media_changed(&di->viocd_info);
204 }
205
206 struct block_device_operations viocd_fops = {
207 .owner = THIS_MODULE,
208 .open = viocd_blk_open,
209 .release = viocd_blk_release,
210 .ioctl = viocd_blk_ioctl,
211 .media_changed = viocd_blk_media_changed,
212 };
213
214 /* Get info on CD devices from OS/400 */
215 static void __init get_viocd_info(void)
216 {
217 HvLpEvent_Rc hvrc;
218 int i;
219 struct viocd_waitevent we;
220 struct cdrom_info *viocd_unitinfo;
221 dma_addr_t unitinfo_dmaaddr;
222
223 viocd_unitinfo = dma_alloc_coherent(iSeries_vio_dev,
224 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
225 &unitinfo_dmaaddr, GFP_ATOMIC);
226 if (viocd_unitinfo == NULL) {
227 printk(VIOCD_KERN_WARNING "error allocating unitinfo\n");
228 return;
229 }
230
231 memset(viocd_unitinfo, 0, sizeof(*viocd_unitinfo) * VIOCD_MAX_CD);
232
233 init_completion(&we.com);
234
235 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
236 HvLpEvent_Type_VirtualIo,
237 viomajorsubtype_cdio | viocdgetinfo,
238 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
239 viopath_sourceinst(viopath_hostLp),
240 viopath_targetinst(viopath_hostLp),
241 (u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
242 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD, 0);
243 if (hvrc != HvLpEvent_Rc_Good) {
244 printk(VIOCD_KERN_WARNING "cdrom error sending event. rc %d\n",
245 (int)hvrc);
246 goto error_ret;
247 }
248
249 wait_for_completion(&we.com);
250
251 if (we.rc) {
252 const struct vio_error_entry *err =
253 vio_lookup_rc(viocd_err_table, we.sub_result);
254 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on getinfo: %s\n",
255 we.rc, we.sub_result, err->msg);
256 goto error_ret;
257 }
258
259 for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++) {
260 viocd_diskinfo[viocd_numdev].unitinfo = viocd_unitinfo[i];
261 viocd_numdev++;
262 }
263
264 error_ret:
265 dma_free_coherent(iSeries_vio_dev,
266 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
267 viocd_unitinfo, unitinfo_dmaaddr);
268 }
269
270 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
271 {
272 struct disk_info *diskinfo = cdi->handle;
273 int device_no = DEVICE_NR(diskinfo);
274 HvLpEvent_Rc hvrc;
275 struct viocd_waitevent we;
276
277 init_completion(&we.com);
278 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
279 HvLpEvent_Type_VirtualIo,
280 viomajorsubtype_cdio | viocdopen,
281 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
282 viopath_sourceinst(viopath_hostLp),
283 viopath_targetinst(viopath_hostLp),
284 (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
285 0, 0, 0);
286 if (hvrc != 0) {
287 printk(VIOCD_KERN_WARNING
288 "bad rc on HvCallEvent_signalLpEventFast %d\n",
289 (int)hvrc);
290 return -EIO;
291 }
292
293 wait_for_completion(&we.com);
294
295 if (we.rc) {
296 const struct vio_error_entry *err =
297 vio_lookup_rc(viocd_err_table, we.sub_result);
298 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
299 we.rc, we.sub_result, err->msg);
300 return -err->errno;
301 }
302
303 return 0;
304 }
305
306 static void viocd_release(struct cdrom_device_info *cdi)
307 {
308 int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
309 HvLpEvent_Rc hvrc;
310
311 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
312 HvLpEvent_Type_VirtualIo,
313 viomajorsubtype_cdio | viocdclose,
314 HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
315 viopath_sourceinst(viopath_hostLp),
316 viopath_targetinst(viopath_hostLp), 0,
317 VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
318 if (hvrc != 0)
319 printk(VIOCD_KERN_WARNING
320 "bad rc on HvCallEvent_signalLpEventFast %d\n",
321 (int)hvrc);
322 }
323
324 /* Send a read or write request to OS/400 */
325 static int send_request(struct request *req)
326 {
327 HvLpEvent_Rc hvrc;
328 struct disk_info *diskinfo = req->rq_disk->private_data;
329 u64 len;
330 dma_addr_t dmaaddr;
331 int direction;
332 u16 cmd;
333 struct scatterlist sg;
334
335 BUG_ON(req->nr_phys_segments > 1);
336
337 if (rq_data_dir(req) == READ) {
338 direction = DMA_FROM_DEVICE;
339 cmd = viomajorsubtype_cdio | viocdread;
340 } else {
341 direction = DMA_TO_DEVICE;
342 cmd = viomajorsubtype_cdio | viocdwrite;
343 }
344
345 if (blk_rq_map_sg(req->q, req, &sg) == 0) {
346 printk(VIOCD_KERN_WARNING
347 "error setting up scatter/gather list\n");
348 return -1;
349 }
350
351 if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
352 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
353 return -1;
354 }
355 dmaaddr = sg_dma_address(&sg);
356 len = sg_dma_len(&sg);
357
358 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
359 HvLpEvent_Type_VirtualIo, cmd,
360 HvLpEvent_AckInd_DoAck,
361 HvLpEvent_AckType_ImmediateAck,
362 viopath_sourceinst(viopath_hostLp),
363 viopath_targetinst(viopath_hostLp),
364 (u64)req, VIOVERSION << 16,
365 ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
366 (u64)req->sector * 512, len, 0);
367 if (hvrc != HvLpEvent_Rc_Good) {
368 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
369 return -1;
370 }
371
372 return 0;
373 }
374
375 static void viocd_end_request(struct request *req, int uptodate)
376 {
377 int nsectors = req->hard_nr_sectors;
378
379 /*
380 * Make sure it's fully ended, and ensure that we process
381 * at least one sector.
382 */
383 if (blk_pc_request(req))
384 nsectors = (req->data_len + 511) >> 9;
385 if (!nsectors)
386 nsectors = 1;
387
388 if (end_that_request_first(req, uptodate, nsectors))
389 BUG();
390 add_disk_randomness(req->rq_disk);
391 blkdev_dequeue_request(req);
392 end_that_request_last(req, uptodate);
393 }
394
395 static int rwreq;
396
397 static void do_viocd_request(struct request_queue *q)
398 {
399 struct request *req;
400
401 while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
402 if (!blk_fs_request(req))
403 viocd_end_request(req, 0);
404 else if (send_request(req) < 0) {
405 printk(VIOCD_KERN_WARNING
406 "unable to send message to OS/400!");
407 viocd_end_request(req, 0);
408 } else
409 rwreq++;
410 }
411 }
412
413 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
414 {
415 struct viocd_waitevent we;
416 HvLpEvent_Rc hvrc;
417 int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
418
419 init_completion(&we.com);
420
421 /* Send the open event to OS/400 */
422 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
423 HvLpEvent_Type_VirtualIo,
424 viomajorsubtype_cdio | viocdcheck,
425 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
426 viopath_sourceinst(viopath_hostLp),
427 viopath_targetinst(viopath_hostLp),
428 (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
429 0, 0, 0);
430 if (hvrc != 0) {
431 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
432 (int)hvrc);
433 return -EIO;
434 }
435
436 wait_for_completion(&we.com);
437
438 /* Check the return code. If bad, assume no change */
439 if (we.rc) {
440 const struct vio_error_entry *err =
441 vio_lookup_rc(viocd_err_table, we.sub_result);
442 printk(VIOCD_KERN_WARNING
443 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
444 we.rc, we.sub_result, err->msg);
445 return 0;
446 }
447
448 return we.changed;
449 }
450
451 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
452 {
453 HvLpEvent_Rc hvrc;
454 u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
455 /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
456 u64 flags = !!locking;
457 struct viocd_waitevent we;
458
459 init_completion(&we.com);
460
461 /* Send the lockdoor event to OS/400 */
462 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
463 HvLpEvent_Type_VirtualIo,
464 viomajorsubtype_cdio | viocdlockdoor,
465 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
466 viopath_sourceinst(viopath_hostLp),
467 viopath_targetinst(viopath_hostLp),
468 (u64)&we, VIOVERSION << 16,
469 (device_no << 48) | (flags << 32), 0, 0, 0);
470 if (hvrc != 0) {
471 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
472 (int)hvrc);
473 return -EIO;
474 }
475
476 wait_for_completion(&we.com);
477
478 if (we.rc != 0)
479 return -EIO;
480 return 0;
481 }
482
483 static int viocd_packet(struct cdrom_device_info *cdi,
484 struct packet_command *cgc)
485 {
486 unsigned int buflen = cgc->buflen;
487 int ret = -EIO;
488
489 switch (cgc->cmd[0]) {
490 case GPCMD_READ_DISC_INFO:
491 {
492 disc_information *di = (disc_information *)cgc->buffer;
493
494 if (buflen >= 2) {
495 di->disc_information_length = cpu_to_be16(1);
496 ret = 0;
497 }
498 if (buflen >= 3)
499 di->erasable =
500 (cdi->ops->capability & ~cdi->mask
501 & (CDC_DVD_RAM | CDC_RAM)) != 0;
502 }
503 break;
504 case GPCMD_GET_CONFIGURATION:
505 if (cgc->cmd[3] == CDF_RWRT) {
506 struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
507
508 if ((buflen >=
509 (sizeof(struct feature_header) + sizeof(*rfd))) &&
510 (cdi->ops->capability & ~cdi->mask
511 & (CDC_DVD_RAM | CDC_RAM))) {
512 rfd->feature_code = cpu_to_be16(CDF_RWRT);
513 rfd->curr = 1;
514 ret = 0;
515 }
516 }
517 break;
518 default:
519 if (cgc->sense) {
520 /* indicate Unknown code */
521 cgc->sense->sense_key = 0x05;
522 cgc->sense->asc = 0x20;
523 cgc->sense->ascq = 0x00;
524 }
525 break;
526 }
527
528 cgc->stat = ret;
529 return ret;
530 }
531
532 static void restart_all_queues(int first_index)
533 {
534 int i;
535
536 for (i = first_index + 1; i < viocd_numdev; i++)
537 if (viocd_diskinfo[i].viocd_disk)
538 blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
539 for (i = 0; i <= first_index; i++)
540 if (viocd_diskinfo[i].viocd_disk)
541 blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
542 }
543
544 /* This routine handles incoming CD LP events */
545 static void vio_handle_cd_event(struct HvLpEvent *event)
546 {
547 struct viocdlpevent *bevent;
548 struct viocd_waitevent *pwe;
549 struct disk_info *di;
550 unsigned long flags;
551 struct request *req;
552
553
554 if (event == NULL)
555 /* Notification that a partition went away! */
556 return;
557 /* First, we should NEVER get an int here...only acks */
558 if (hvlpevent_is_int(event)) {
559 printk(VIOCD_KERN_WARNING
560 "Yikes! got an int in viocd event handler!\n");
561 if (hvlpevent_need_ack(event)) {
562 event->xRc = HvLpEvent_Rc_InvalidSubtype;
563 HvCallEvent_ackLpEvent(event);
564 }
565 }
566
567 bevent = (struct viocdlpevent *)event;
568
569 switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
570 case viocdopen:
571 if (event->xRc == 0) {
572 di = &viocd_diskinfo[bevent->disk];
573 blk_queue_hardsect_size(di->viocd_disk->queue,
574 bevent->block_size);
575 set_capacity(di->viocd_disk,
576 bevent->media_size *
577 bevent->block_size / 512);
578 }
579 /* FALLTHROUGH !! */
580 case viocdgetinfo:
581 case viocdlockdoor:
582 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
583 return_complete:
584 pwe->rc = event->xRc;
585 pwe->sub_result = bevent->sub_result;
586 complete(&pwe->com);
587 break;
588
589 case viocdcheck:
590 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
591 pwe->changed = bevent->flags;
592 goto return_complete;
593
594 case viocdclose:
595 break;
596
597 case viocdwrite:
598 case viocdread:
599 /*
600 * Since this is running in interrupt mode, we need to
601 * make sure we're not stepping on any global I/O operations
602 */
603 di = &viocd_diskinfo[bevent->disk];
604 spin_lock_irqsave(&viocd_reqlock, flags);
605 dma_unmap_single(di->dev, bevent->token, bevent->len,
606 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
607 ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
608 req = (struct request *)bevent->event.xCorrelationToken;
609 rwreq--;
610
611 if (event->xRc != HvLpEvent_Rc_Good) {
612 const struct vio_error_entry *err =
613 vio_lookup_rc(viocd_err_table,
614 bevent->sub_result);
615 printk(VIOCD_KERN_WARNING "request %p failed "
616 "with rc %d:0x%04X: %s\n",
617 req, event->xRc,
618 bevent->sub_result, err->msg);
619 viocd_end_request(req, 0);
620 } else
621 viocd_end_request(req, 1);
622
623 /* restart handling of incoming requests */
624 spin_unlock_irqrestore(&viocd_reqlock, flags);
625 restart_all_queues(bevent->disk);
626 break;
627
628 default:
629 printk(VIOCD_KERN_WARNING
630 "message with invalid subtype %0x04X!\n",
631 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
632 if (hvlpevent_need_ack(event)) {
633 event->xRc = HvLpEvent_Rc_InvalidSubtype;
634 HvCallEvent_ackLpEvent(event);
635 }
636 }
637 }
638
639 static struct cdrom_device_ops viocd_dops = {
640 .open = viocd_open,
641 .release = viocd_release,
642 .media_changed = viocd_media_changed,
643 .lock_door = viocd_lock_door,
644 .generic_packet = viocd_packet,
645 .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
646 };
647
648 static int __init find_capability(const char *type)
649 {
650 struct capability_entry *entry;
651
652 for(entry = capability_table; entry->type; ++entry)
653 if(!strncmp(entry->type, type, 4))
654 break;
655 return entry->capability;
656 }
657
658 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
659 {
660 struct gendisk *gendisk;
661 int deviceno;
662 struct disk_info *d;
663 struct cdrom_device_info *c;
664 struct cdrom_info *ci;
665 struct request_queue *q;
666
667 deviceno = vdev->unit_address;
668 if (deviceno >= viocd_numdev)
669 return -ENODEV;
670
671 d = &viocd_diskinfo[deviceno];
672 c = &d->viocd_info;
673 ci = &d->unitinfo;
674
675 c->ops = &viocd_dops;
676 c->speed = 4;
677 c->capacity = 1;
678 c->handle = d;
679 c->mask = ~find_capability(ci->type);
680 sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
681
682 if (register_cdrom(c) != 0) {
683 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
684 c->name);
685 goto out;
686 }
687 printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
688 "type %4.4s, model %3.3s\n",
689 c->name, ci->rsrcname, ci->type, ci->model);
690 q = blk_init_queue(do_viocd_request, &viocd_reqlock);
691 if (q == NULL) {
692 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
693 c->name);
694 goto out_unregister_cdrom;
695 }
696 gendisk = alloc_disk(1);
697 if (gendisk == NULL) {
698 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
699 c->name);
700 goto out_cleanup_queue;
701 }
702 gendisk->major = VIOCD_MAJOR;
703 gendisk->first_minor = deviceno;
704 strncpy(gendisk->disk_name, c->name,
705 sizeof(gendisk->disk_name));
706 blk_queue_max_hw_segments(q, 1);
707 blk_queue_max_phys_segments(q, 1);
708 blk_queue_max_sectors(q, 4096 / 512);
709 gendisk->queue = q;
710 gendisk->fops = &viocd_fops;
711 gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
712 set_capacity(gendisk, 0);
713 gendisk->private_data = d;
714 d->viocd_disk = gendisk;
715 d->dev = &vdev->dev;
716 gendisk->driverfs_dev = d->dev;
717 add_disk(gendisk);
718 return 0;
719
720 out_cleanup_queue:
721 blk_cleanup_queue(q);
722 out_unregister_cdrom:
723 unregister_cdrom(c);
724 out:
725 return -ENODEV;
726 }
727
728 static int viocd_remove(struct vio_dev *vdev)
729 {
730 struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
731
732 if (unregister_cdrom(&d->viocd_info) != 0)
733 printk(VIOCD_KERN_WARNING
734 "Cannot unregister viocd CD-ROM %s!\n",
735 d->viocd_info.name);
736 del_gendisk(d->viocd_disk);
737 blk_cleanup_queue(d->viocd_disk->queue);
738 put_disk(d->viocd_disk);
739 return 0;
740 }
741
742 /**
743 * viocd_device_table: Used by vio.c to match devices that we
744 * support.
745 */
746 static struct vio_device_id viocd_device_table[] __devinitdata = {
747 { "block", "IBM,iSeries-viocd" },
748 { "", "" }
749 };
750 MODULE_DEVICE_TABLE(vio, viocd_device_table);
751
752 static struct vio_driver viocd_driver = {
753 .id_table = viocd_device_table,
754 .probe = viocd_probe,
755 .remove = viocd_remove,
756 .driver = {
757 .name = "viocd",
758 .owner = THIS_MODULE,
759 }
760 };
761
762 static int __init viocd_init(void)
763 {
764 struct proc_dir_entry *e;
765 int ret = 0;
766
767 if (!firmware_has_feature(FW_FEATURE_ISERIES))
768 return -ENODEV;
769
770 if (viopath_hostLp == HvLpIndexInvalid) {
771 vio_set_hostlp();
772 /* If we don't have a host, bail out */
773 if (viopath_hostLp == HvLpIndexInvalid)
774 return -ENODEV;
775 }
776
777 printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
778 viopath_hostLp);
779
780 if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
781 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
782 VIOCD_MAJOR, VIOCD_DEVICE);
783 return -EIO;
784 }
785
786 ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
787 MAX_CD_REQ + 2);
788 if (ret) {
789 printk(VIOCD_KERN_WARNING
790 "error opening path to host partition %d\n",
791 viopath_hostLp);
792 goto out_unregister;
793 }
794
795 /* Initialize our request handler */
796 vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
797
798 get_viocd_info();
799
800 spin_lock_init(&viocd_reqlock);
801
802 ret = vio_register_driver(&viocd_driver);
803 if (ret)
804 goto out_free_info;
805
806 e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
807 if (e) {
808 e->owner = THIS_MODULE;
809 e->proc_fops = &proc_viocd_operations;
810 }
811
812 return 0;
813
814 out_free_info:
815 vio_clearHandler(viomajorsubtype_cdio);
816 viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
817 out_unregister:
818 unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
819 return ret;
820 }
821
822 static void __exit viocd_exit(void)
823 {
824 remove_proc_entry("iSeries/viocd", NULL);
825 vio_unregister_driver(&viocd_driver);
826 viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
827 vio_clearHandler(viomajorsubtype_cdio);
828 unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
829 }
830
831 module_init(viocd_init);
832 module_exit(viocd_exit);
833 MODULE_LICENSE("GPL");
WandBoard kernel