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Merge branch 'firewire-kernel-streaming' of git://git.alsa-project.org/alsa-kprivate
[firewire-audio.git] / drivers / s390 / block / dasd_fba.c
blobbe89b3a893da4c91aa84cf509a1ab1717b3adfc0
1 /*
2 * File...........: linux/drivers/s390/block/dasd_fba.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Bugreports.to..: <Linux390@de.ibm.com>
5 * Copyright IBM Corp. 1999, 2009
6 */
7
8 #define KMSG_COMPONENT "dasd-fba"
9
10 #include <linux/stddef.h>
11 #include <linux/kernel.h>
12 #include <asm/debug.h>
13
14 #include <linux/slab.h>
15 #include <linux/hdreg.h> /* HDIO_GETGEO */
16 #include <linux/bio.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19
20 #include <asm/idals.h>
21 #include <asm/ebcdic.h>
22 #include <asm/io.h>
23 #include <asm/ccwdev.h>
24
25 #include "dasd_int.h"
26 #include "dasd_fba.h"
27
28 #ifdef PRINTK_HEADER
29 #undef PRINTK_HEADER
30 #endif /* PRINTK_HEADER */
31 #define PRINTK_HEADER "dasd(fba):"
32
33 #define DASD_FBA_CCW_WRITE 0x41
34 #define DASD_FBA_CCW_READ 0x42
35 #define DASD_FBA_CCW_LOCATE 0x43
36 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
37
38 MODULE_LICENSE("GPL");
39
40 static struct dasd_discipline dasd_fba_discipline;
41
42 struct dasd_fba_private {
43 struct dasd_fba_characteristics rdc_data;
44 };
45
46 static struct ccw_device_id dasd_fba_ids[] = {
47 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
48 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
49 { /* end of list */ },
50 };
51
52 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
53
54 static struct ccw_driver dasd_fba_driver; /* see below */
55 static int
56 dasd_fba_probe(struct ccw_device *cdev)
57 {
58 return dasd_generic_probe(cdev, &dasd_fba_discipline);
59 }
60
61 static int
62 dasd_fba_set_online(struct ccw_device *cdev)
63 {
64 return dasd_generic_set_online(cdev, &dasd_fba_discipline);
65 }
66
67 static struct ccw_driver dasd_fba_driver = {
68 .name = "dasd-fba",
69 .owner = THIS_MODULE,
70 .ids = dasd_fba_ids,
71 .probe = dasd_fba_probe,
72 .remove = dasd_generic_remove,
73 .set_offline = dasd_generic_set_offline,
74 .set_online = dasd_fba_set_online,
75 .notify = dasd_generic_notify,
76 .path_event = dasd_generic_path_event,
77 .freeze = dasd_generic_pm_freeze,
78 .thaw = dasd_generic_restore_device,
79 .restore = dasd_generic_restore_device,
80 };
81
82 static void
83 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
84 int blksize, int beg, int nr)
85 {
86 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
87 ccw->flags = 0;
88 ccw->count = 16;
89 ccw->cda = (__u32) __pa(data);
90 memset(data, 0, sizeof (struct DE_fba_data));
91 if (rw == WRITE)
92 (data->mask).perm = 0x0;
93 else if (rw == READ)
94 (data->mask).perm = 0x1;
95 else
96 data->mask.perm = 0x2;
97 data->blk_size = blksize;
98 data->ext_loc = beg;
99 data->ext_end = nr - 1;
100 }
101
102 static void
103 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
104 int block_nr, int block_ct)
105 {
106 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
107 ccw->flags = 0;
108 ccw->count = 8;
109 ccw->cda = (__u32) __pa(data);
110 memset(data, 0, sizeof (struct LO_fba_data));
111 if (rw == WRITE)
112 data->operation.cmd = 0x5;
113 else if (rw == READ)
114 data->operation.cmd = 0x6;
115 else
116 data->operation.cmd = 0x8;
117 data->blk_nr = block_nr;
118 data->blk_ct = block_ct;
119 }
120
121 static int
122 dasd_fba_check_characteristics(struct dasd_device *device)
123 {
124 struct dasd_block *block;
125 struct dasd_fba_private *private;
126 struct ccw_device *cdev = device->cdev;
127 int rc;
128 int readonly;
129
130 private = (struct dasd_fba_private *) device->private;
131 if (!private) {
132 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
133 if (!private) {
134 dev_warn(&device->cdev->dev,
135 "Allocating memory for private DASD "
136 "data failed\n");
137 return -ENOMEM;
138 }
139 device->private = (void *) private;
140 } else {
141 memset(private, 0, sizeof(*private));
142 }
143 block = dasd_alloc_block();
144 if (IS_ERR(block)) {
145 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
146 "dasd block structure");
147 device->private = NULL;
148 kfree(private);
149 return PTR_ERR(block);
150 }
151 device->block = block;
152 block->base = device;
153
154 /* Read Device Characteristics */
155 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
156 &private->rdc_data, 32);
157 if (rc) {
158 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
159 "characteristics returned error %d", rc);
160 device->block = NULL;
161 dasd_free_block(block);
162 device->private = NULL;
163 kfree(private);
164 return rc;
165 }
166
167 device->default_expires = DASD_EXPIRES;
168 device->path_data.opm = LPM_ANYPATH;
169
170 readonly = dasd_device_is_ro(device);
171 if (readonly)
172 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
173
174 dev_info(&device->cdev->dev,
175 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
176 "and %d B/blk%s\n",
177 cdev->id.dev_type,
178 cdev->id.dev_model,
179 cdev->id.cu_type,
180 cdev->id.cu_model,
181 ((private->rdc_data.blk_bdsa *
182 (private->rdc_data.blk_size >> 9)) >> 11),
183 private->rdc_data.blk_size,
184 readonly ? ", read-only device" : "");
185 return 0;
186 }
187
188 static int dasd_fba_do_analysis(struct dasd_block *block)
189 {
190 struct dasd_fba_private *private;
191 int sb, rc;
192
193 private = (struct dasd_fba_private *) block->base->private;
194 rc = dasd_check_blocksize(private->rdc_data.blk_size);
195 if (rc) {
196 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
197 private->rdc_data.blk_size);
198 return rc;
199 }
200 block->blocks = private->rdc_data.blk_bdsa;
201 block->bp_block = private->rdc_data.blk_size;
202 block->s2b_shift = 0; /* bits to shift 512 to get a block */
203 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
204 block->s2b_shift++;
205 return 0;
206 }
207
208 static int dasd_fba_fill_geometry(struct dasd_block *block,
209 struct hd_geometry *geo)
210 {
211 if (dasd_check_blocksize(block->bp_block) != 0)
212 return -EINVAL;
213 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
214 geo->heads = 16;
215 geo->sectors = 128 >> block->s2b_shift;
216 return 0;
217 }
218
219 static dasd_erp_fn_t
220 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
221 {
222 return dasd_default_erp_action;
223 }
224
225 static dasd_erp_fn_t
226 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
227 {
228 if (cqr->function == dasd_default_erp_action)
229 return dasd_default_erp_postaction;
230
231 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
232 cqr->function);
233 return NULL;
234 }
235
236 static void dasd_fba_check_for_device_change(struct dasd_device *device,
237 struct dasd_ccw_req *cqr,
238 struct irb *irb)
239 {
240 char mask;
241
242 /* first of all check for state change pending interrupt */
243 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
244 if ((irb->scsw.cmd.dstat & mask) == mask)
245 dasd_generic_handle_state_change(device);
246 };
247
248 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
249 struct dasd_block *block,
250 struct request *req)
251 {
252 struct dasd_fba_private *private;
253 unsigned long *idaws;
254 struct LO_fba_data *LO_data;
255 struct dasd_ccw_req *cqr;
256 struct ccw1 *ccw;
257 struct req_iterator iter;
258 struct bio_vec *bv;
259 char *dst;
260 int count, cidaw, cplength, datasize;
261 sector_t recid, first_rec, last_rec;
262 unsigned int blksize, off;
263 unsigned char cmd;
264
265 private = (struct dasd_fba_private *) block->base->private;
266 if (rq_data_dir(req) == READ) {
267 cmd = DASD_FBA_CCW_READ;
268 } else if (rq_data_dir(req) == WRITE) {
269 cmd = DASD_FBA_CCW_WRITE;
270 } else
271 return ERR_PTR(-EINVAL);
272 blksize = block->bp_block;
273 /* Calculate record id of first and last block. */
274 first_rec = blk_rq_pos(req) >> block->s2b_shift;
275 last_rec =
276 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
277 /* Check struct bio and count the number of blocks for the request. */
278 count = 0;
279 cidaw = 0;
280 rq_for_each_segment(bv, req, iter) {
281 if (bv->bv_len & (blksize - 1))
282 /* Fba can only do full blocks. */
283 return ERR_PTR(-EINVAL);
284 count += bv->bv_len >> (block->s2b_shift + 9);
285 #if defined(CONFIG_64BIT)
286 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
287 cidaw += bv->bv_len / blksize;
288 #endif
289 }
290 /* Paranoia. */
291 if (count != last_rec - first_rec + 1)
292 return ERR_PTR(-EINVAL);
293 /* 1x define extent + 1x locate record + number of blocks */
294 cplength = 2 + count;
295 /* 1x define extent + 1x locate record */
296 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
297 cidaw * sizeof(unsigned long);
298 /*
299 * Find out number of additional locate record ccws if the device
300 * can't do data chaining.
301 */
302 if (private->rdc_data.mode.bits.data_chain == 0) {
303 cplength += count - 1;
304 datasize += (count - 1)*sizeof(struct LO_fba_data);
305 }
306 /* Allocate the ccw request. */
307 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
308 if (IS_ERR(cqr))
309 return cqr;
310 ccw = cqr->cpaddr;
311 /* First ccw is define extent. */
312 define_extent(ccw++, cqr->data, rq_data_dir(req),
313 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
314 /* Build locate_record + read/write ccws. */
315 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
316 LO_data = (struct LO_fba_data *) (idaws + cidaw);
317 /* Locate record for all blocks for smart devices. */
318 if (private->rdc_data.mode.bits.data_chain != 0) {
319 ccw[-1].flags |= CCW_FLAG_CC;
320 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
321 }
322 recid = first_rec;
323 rq_for_each_segment(bv, req, iter) {
324 dst = page_address(bv->bv_page) + bv->bv_offset;
325 if (dasd_page_cache) {
326 char *copy = kmem_cache_alloc(dasd_page_cache,
327 GFP_DMA | __GFP_NOWARN);
328 if (copy && rq_data_dir(req) == WRITE)
329 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
330 if (copy)
331 dst = copy + bv->bv_offset;
332 }
333 for (off = 0; off < bv->bv_len; off += blksize) {
334 /* Locate record for stupid devices. */
335 if (private->rdc_data.mode.bits.data_chain == 0) {
336 ccw[-1].flags |= CCW_FLAG_CC;
337 locate_record(ccw, LO_data++,
338 rq_data_dir(req),
339 recid - first_rec, 1);
340 ccw->flags = CCW_FLAG_CC;
341 ccw++;
342 } else {
343 if (recid > first_rec)
344 ccw[-1].flags |= CCW_FLAG_DC;
345 else
346 ccw[-1].flags |= CCW_FLAG_CC;
347 }
348 ccw->cmd_code = cmd;
349 ccw->count = block->bp_block;
350 if (idal_is_needed(dst, blksize)) {
351 ccw->cda = (__u32)(addr_t) idaws;
352 ccw->flags = CCW_FLAG_IDA;
353 idaws = idal_create_words(idaws, dst, blksize);
354 } else {
355 ccw->cda = (__u32)(addr_t) dst;
356 ccw->flags = 0;
357 }
358 ccw++;
359 dst += blksize;
360 recid++;
361 }
362 }
363 if (blk_noretry_request(req) ||
364 block->base->features & DASD_FEATURE_FAILFAST)
365 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
366 cqr->startdev = memdev;
367 cqr->memdev = memdev;
368 cqr->block = block;
369 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
370 cqr->retries = 32;
371 cqr->buildclk = get_clock();
372 cqr->status = DASD_CQR_FILLED;
373 return cqr;
374 }
375
376 static int
377 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
378 {
379 struct dasd_fba_private *private;
380 struct ccw1 *ccw;
381 struct req_iterator iter;
382 struct bio_vec *bv;
383 char *dst, *cda;
384 unsigned int blksize, off;
385 int status;
386
387 if (!dasd_page_cache)
388 goto out;
389 private = (struct dasd_fba_private *) cqr->block->base->private;
390 blksize = cqr->block->bp_block;
391 ccw = cqr->cpaddr;
392 /* Skip over define extent & locate record. */
393 ccw++;
394 if (private->rdc_data.mode.bits.data_chain != 0)
395 ccw++;
396 rq_for_each_segment(bv, req, iter) {
397 dst = page_address(bv->bv_page) + bv->bv_offset;
398 for (off = 0; off < bv->bv_len; off += blksize) {
399 /* Skip locate record. */
400 if (private->rdc_data.mode.bits.data_chain == 0)
401 ccw++;
402 if (dst) {
403 if (ccw->flags & CCW_FLAG_IDA)
404 cda = *((char **)((addr_t) ccw->cda));
405 else
406 cda = (char *)((addr_t) ccw->cda);
407 if (dst != cda) {
408 if (rq_data_dir(req) == READ)
409 memcpy(dst, cda, bv->bv_len);
410 kmem_cache_free(dasd_page_cache,
411 (void *)((addr_t)cda & PAGE_MASK));
412 }
413 dst = NULL;
414 }
415 ccw++;
416 }
417 }
418 out:
419 status = cqr->status == DASD_CQR_DONE;
420 dasd_sfree_request(cqr, cqr->memdev);
421 return status;
422 }
423
424 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
425 {
426 cqr->status = DASD_CQR_FILLED;
427 };
428
429 static int
430 dasd_fba_fill_info(struct dasd_device * device,
431 struct dasd_information2_t * info)
432 {
433 info->label_block = 1;
434 info->FBA_layout = 1;
435 info->format = DASD_FORMAT_LDL;
436 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
437 memcpy(info->characteristics,
438 &((struct dasd_fba_private *) device->private)->rdc_data,
439 sizeof (struct dasd_fba_characteristics));
440 info->confdata_size = 0;
441 return 0;
442 }
443
444 static void
445 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
446 char *reason)
447 {
448 u64 *sense;
449
450 sense = (u64 *) dasd_get_sense(irb);
451 if (sense) {
452 DBF_DEV_EVENT(DBF_EMERG, device,
453 "%s: %s %02x%02x%02x %016llx %016llx %016llx "
454 "%016llx", reason,
455 scsw_is_tm(&irb->scsw) ? "t" : "c",
456 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
457 scsw_dstat(&irb->scsw), sense[0], sense[1],
458 sense[2], sense[3]);
459 } else {
460 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
461 "SORRY - NO VALID SENSE AVAILABLE\n");
462 }
463 }
464
465
466 static void
467 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
468 struct irb *irb)
469 {
470 char *page;
471 struct ccw1 *act, *end, *last;
472 int len, sl, sct, count;
473
474 page = (char *) get_zeroed_page(GFP_ATOMIC);
475 if (page == NULL) {
476 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
477 "No memory to dump sense data");
478 return;
479 }
480 len = sprintf(page, KERN_ERR PRINTK_HEADER
481 " I/O status report for device %s:\n",
482 dev_name(&device->cdev->dev));
483 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
484 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
485 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
486 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
487 " device %s: Failing CCW: %p\n",
488 dev_name(&device->cdev->dev),
489 (void *) (addr_t) irb->scsw.cmd.cpa);
490 if (irb->esw.esw0.erw.cons) {
491 for (sl = 0; sl < 4; sl++) {
492 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
493 " Sense(hex) %2d-%2d:",
494 (8 * sl), ((8 * sl) + 7));
495
496 for (sct = 0; sct < 8; sct++) {
497 len += sprintf(page + len, " %02x",
498 irb->ecw[8 * sl + sct]);
499 }
500 len += sprintf(page + len, "\n");
501 }
502 } else {
503 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
504 " SORRY - NO VALID SENSE AVAILABLE\n");
505 }
506 printk(KERN_ERR "%s", page);
507
508 /* dump the Channel Program */
509 /* print first CCWs (maximum 8) */
510 act = req->cpaddr;
511 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
512 end = min(act + 8, last);
513 len = sprintf(page, KERN_ERR PRINTK_HEADER
514 " Related CP in req: %p\n", req);
515 while (act <= end) {
516 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
517 " CCW %p: %08X %08X DAT:",
518 act, ((int *) act)[0], ((int *) act)[1]);
519 for (count = 0; count < 32 && count < act->count;
520 count += sizeof(int))
521 len += sprintf(page + len, " %08X",
522 ((int *) (addr_t) act->cda)
523 [(count>>2)]);
524 len += sprintf(page + len, "\n");
525 act++;
526 }
527 printk(KERN_ERR "%s", page);
528
529
530 /* print failing CCW area */
531 len = 0;
532 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
533 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
534 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
535 }
536 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
537 while (act <= end) {
538 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
539 " CCW %p: %08X %08X DAT:",
540 act, ((int *) act)[0], ((int *) act)[1]);
541 for (count = 0; count < 32 && count < act->count;
542 count += sizeof(int))
543 len += sprintf(page + len, " %08X",
544 ((int *) (addr_t) act->cda)
545 [(count>>2)]);
546 len += sprintf(page + len, "\n");
547 act++;
548 }
549
550 /* print last CCWs */
551 if (act < last - 2) {
552 act = last - 2;
553 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
554 }
555 while (act <= last) {
556 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
557 " CCW %p: %08X %08X DAT:",
558 act, ((int *) act)[0], ((int *) act)[1]);
559 for (count = 0; count < 32 && count < act->count;
560 count += sizeof(int))
561 len += sprintf(page + len, " %08X",
562 ((int *) (addr_t) act->cda)
563 [(count>>2)]);
564 len += sprintf(page + len, "\n");
565 act++;
566 }
567 if (len > 0)
568 printk(KERN_ERR "%s", page);
569 free_page((unsigned long) page);
570 }
571
572 /*
573 * max_blocks is dependent on the amount of storage that is available
574 * in the static io buffer for each device. Currently each device has
575 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
576 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
577 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
578 * addition we have one define extent ccw + 16 bytes of data and a
579 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
580 * That makes:
581 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
582 * We want to fit two into the available memory so that we can immediately
583 * start the next request if one finishes off. That makes 100.1 blocks
584 * for one request. Give a little safety and the result is 96.
585 */
586 static struct dasd_discipline dasd_fba_discipline = {
587 .owner = THIS_MODULE,
588 .name = "FBA ",
589 .ebcname = "FBA ",
590 .max_blocks = 96,
591 .check_device = dasd_fba_check_characteristics,
592 .do_analysis = dasd_fba_do_analysis,
593 .verify_path = dasd_generic_verify_path,
594 .fill_geometry = dasd_fba_fill_geometry,
595 .start_IO = dasd_start_IO,
596 .term_IO = dasd_term_IO,
597 .handle_terminated_request = dasd_fba_handle_terminated_request,
598 .erp_action = dasd_fba_erp_action,
599 .erp_postaction = dasd_fba_erp_postaction,
600 .check_for_device_change = dasd_fba_check_for_device_change,
601 .build_cp = dasd_fba_build_cp,
602 .free_cp = dasd_fba_free_cp,
603 .dump_sense = dasd_fba_dump_sense,
604 .dump_sense_dbf = dasd_fba_dump_sense_dbf,
605 .fill_info = dasd_fba_fill_info,
606 };
607
608 static int __init
609 dasd_fba_init(void)
610 {
611 int ret;
612
613 ASCEBC(dasd_fba_discipline.ebcname, 4);
614 ret = ccw_driver_register(&dasd_fba_driver);
615 if (!ret)
616 wait_for_device_probe();
617
618 return ret;
619 }
620
621 static void __exit
622 dasd_fba_cleanup(void)
623 {
624 ccw_driver_unregister(&dasd_fba_driver);
625 }
626
627 module_init(dasd_fba_init);
628 module_exit(dasd_fba_cleanup);
AMDTP streaming driver for the Linux FireWire stack (Juju)