aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/firewire-cdev.h
blob: 8b9b27373219366a8bbcc53b4c991bb6f3fbc957 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
/*
 * Char device interface.
 *
 * Copyright (C) 2005-2006  Kristian Hoegsberg <krh@bitplanet.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef _LINUX_FIREWIRE_CDEV_H
#define _LINUX_FIREWIRE_CDEV_H

#include <linux/ioctl.h>
#include <linux/types.h>
#include <linux/firewire-constants.h>

#define FW_CDEV_EVENT_BUS_RESET			0x00
#define FW_CDEV_EVENT_RESPONSE			0x01
#define FW_CDEV_EVENT_REQUEST			0x02
#define FW_CDEV_EVENT_ISO_INTERRUPT		0x03
#define FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED	0x04
#define FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED	0x05

/* available since kernel version 2.6.36 */
#define FW_CDEV_EVENT_REQUEST2			0x06

/**
 * struct fw_cdev_event_common - Common part of all fw_cdev_event_ types
 * @closure:	For arbitrary use by userspace
 * @type:	Discriminates the fw_cdev_event_ types
 *
 * This struct may be used to access generic members of all fw_cdev_event_
 * types regardless of the specific type.
 *
 * Data passed in the @closure field for a request will be returned in the
 * corresponding event.  It is big enough to hold a pointer on all platforms.
 * The ioctl used to set @closure depends on the @type of event.
 */
struct fw_cdev_event_common {
	__u64 closure;
	__u32 type;
};

/**
 * struct fw_cdev_event_bus_reset - Sent when a bus reset occurred
 * @closure:	See &fw_cdev_event_common; set by %FW_CDEV_IOC_GET_INFO ioctl
 * @type:	See &fw_cdev_event_common; always %FW_CDEV_EVENT_BUS_RESET
 * @node_id:       New node ID of this node
 * @local_node_id: Node ID of the local node, i.e. of the controller
 * @bm_node_id:    Node ID of the bus manager
 * @irm_node_id:   Node ID of the iso resource manager
 * @root_node_id:  Node ID of the root node
 * @generation:    New bus generation
 *
 * This event is sent when the bus the device belongs to goes through a bus
 * reset.  It provides information about the new bus configuration, such as
 * new node ID for this device, new root ID, and others.
 */
struct fw_cdev_event_bus_reset {
	__u64 closure;
	__u32 type;
	__u32 node_id;
	__u32 local_node_id;
	__u32 bm_node_id;
	__u32 irm_node_id;
	__u32 root_node_id;
	__u32 generation;
};

/**
 * struct fw_cdev_event_response - Sent when a response packet was received
 * @closure:	See &fw_cdev_event_common;
 *		set by %FW_CDEV_IOC_SEND_REQUEST ioctl
 * @type:	See &fw_cdev_event_common; always %FW_CDEV_EVENT_RESPONSE
 * @rcode:	Response code returned by the remote node
 * @length:	Data length, i.e. the response's payload size in bytes
 * @data:	Payload data, if any
 *
 * This event is sent when the stack receives a response to an outgoing request
 * sent by %FW_CDEV_IOC_SEND_REQUEST ioctl.  The payload data for responses
 * carrying data (read and lock responses) follows immediately and can be
 * accessed through the @data field.
 */
struct fw_cdev_event_response {
	__u64 closure;
	__u32 type;
	__u32 rcode;
	__u32 length;
	__u32 data[0];
};

/**
 * struct fw_cdev_event_request - Old version of &fw_cdev_event_request2
 * @closure:	See &fw_cdev_event_common; set by %FW_CDEV_IOC_ALLOCATE ioctl
 * @type:	See &fw_cdev_event_common; always %FW_CDEV_EVENT_REQUEST
 * @tcode:	See &fw_cdev_event_request2
 * @offset:	See &fw_cdev_event_request2
 * @handle:	See &fw_cdev_event_request2
 * @length:	See &fw_cdev_event_request2
 * @data:	See &fw_cdev_event_request2
 *
 * This event is sent instead of &fw_cdev_event_request2 if the kernel or
 * the client implements ABI version <= 3.
 *
 * Unlike &fw_cdev_event_request2, the sender identity cannot be established,
 * broadcast write requests cannot be distinguished from unicast writes, and
 * @tcode of lock requests is %TCODE_LOCK_REQUEST.
 *
 * Requests to the FCP_REQUEST or FCP_RESPONSE register are responded to as
 * with &fw_cdev_event_request2, except in kernel 2.6.32 and older which send
 * the response packet of the client's %FW_CDEV_IOC_SEND_RESPONSE ioctl.
 */
struct fw_cdev_event_request {
	__u64 closure;
	__u32 type;
	__u32 tcode;
	__u64 offset;
	__u32 handle;
	__u32 length;
	__u32 data[0];
};

/**
 * struct fw_cdev_event_request2 - Sent on incoming request to an address region
 * @closure:	See &fw_cdev_event_common; set by %FW_CDEV_IOC_ALLOCATE ioctl
 * @type:	See &fw_cdev_event_common; always %FW_CDEV_EVENT_REQUEST2
 * @tcode:	Transaction code of the incoming request
 * @offset:	The offset into the 48-bit per-node address space
 * @source_node_id: Sender node ID
 * @destination_node_id: Destination node ID
 * @card:	The index of the card from which the request came
 * @generation:	Bus generation in which the request is valid
 * @handle:	Reference to the kernel-side pending request
 * @length:	Data length, i.e. the request's payload size in bytes
 * @data:	Incoming data, if any
 *
 * This event is sent when the stack receives an incoming request to an address
 * region registered using the %FW_CDEV_IOC_ALLOCATE ioctl.  The request is
 * guaranteed to be completely contained in the specified region.  Userspace is
 * responsible for sending the response by %FW_CDEV_IOC_SEND_RESPONSE ioctl,
 * using the same @handle.
 *
 * The payload data for requests carrying data (write and lock requests)
 * follows immediately and can be accessed through the @data field.
 *
 * Unlike &fw_cdev_event_request, @tcode of lock requests is one of the
 * firewire-core specific %TCODE_LOCK_MASK_SWAP...%TCODE_LOCK_VENDOR_DEPENDENT,
 * i.e. encodes the extended transaction code.
 *
 * @card may differ from &fw_cdev_get_info.card because requests are received
 * from all cards of the Linux host.  @source_node_id, @destination_node_id, and
 * @generation pertain to that card.  Destination node ID and bus generation may
 * therefore differ from the corresponding fields of the last
 * &fw_cdev_event_bus_reset.
 *
 * @destination_node_id may also differ from the current node ID because of a
 * non-local bus ID part or in case of a broadcast write request.  Note, a
 * client must call an %FW_CDEV_IOC_SEND_RESPONSE ioctl even in case of a
 * broadcast write request; the kernel will then release the kernel-side pending
 * request but will not actually send a response packet.
 *
 * In case of a write request to FCP_REQUEST or FCP_RESPONSE, the kernel already
 * sent a write response immediately after the request was received; in this
 * case the client must still call an %FW_CDEV_IOC_SEND_RESPONSE ioctl to
 * release the kernel-side pending request, though another response won't be
 * sent.
 *
 * If the client subsequently needs to initiate requests to the sender node of
 * an &fw_cdev_event_request2, it needs to use a device file with matching
 * card index, node ID, and generation for outbound requests.
 */
struct fw_cdev_event_request2 {
	__u64 closure;
	__u32 type;
	__u32 tcode;
	__u64 offset;
	__u32 source_node_id;
	__u32 destination_node_id;
	__u32 card;
	__u32 generation;
	__u32 handle;
	__u32 length;
	__u32 data[0];
};

/**
 * struct fw_cdev_event_iso_interrupt - Sent when an iso packet was completed
 * @closure:	See &fw_cdev_event_common;
 *		set by %FW_CDEV_CREATE_ISO_CONTEXT ioctl
 * @type:	See &fw_cdev_event_common; always %FW_CDEV_EVENT_ISO_INTERRUPT
 * @cycle:	Cycle counter of the interrupt packet
 * @header_length: Total length of following headers, in bytes
 * @header:	Stripped headers, if any
 *
 * This event is sent when the controller has completed an &fw_cdev_iso_packet
 * with the %FW_CDEV_ISO_INTERRUPT bit set.
 *
 * Isochronous transmit events:
 *
 * In version 1 of the ABI, &header_length is 0.  In version 3 and some
 * implementations of version 2 of the ABI, &header_length is a multiple of 4
 * and &header contains timestamps of all packets up until the interrupt packet.
 * The format of the timestamps is as described below for isochronous reception.
 *
 * Isochronous receive events:
 *
 * The headers stripped of all packets up until and including the interrupt
 * packet are returned in the @header field.  The amount of header data per
 * packet is as specified at iso context creation by
 * &fw_cdev_create_iso_context.header_size.
 *
 * In version 1 of this ABI, header data consisted of the 1394 isochronous
 * packet header, followed by quadlets from the packet payload if
 * &fw_cdev_create_iso_context.header_size > 4.
 *
 * In version 2 of this ABI, header data consist of the 1394 isochronous
 * packet header, followed by a timestamp quadlet if
 * &fw_cdev_create_iso_context.header_size > 4, followed by quadlets from the
 * packet payload if &fw_cdev_create_iso_context.header_size > 8.
 *
 * Behaviour of ver. 1 of this ABI is no longer available since ABI ver. 2.
 *
 * Format of 1394 iso packet header: 16 bits len, 2 bits tag, 6 bits channel,
 * 4 bits tcode, 4 bits sy, in big endian byte order.  Format of timestamp:
 * 16 bits invalid, 3 bits cycleSeconds, 13 bits cycleCount, in big endian byte
 * order.
 */
struct fw_cdev_event_iso_interrupt {
	__u64 closure;
	__u32 type;
	__u32 cycle;
	__u32 header_length;
	__u32 header[0];
};

/**
 * struct fw_cdev_event_iso_resource - Iso resources were allocated or freed
 * @closure:	See &fw_cdev_event_common;
 *		set by %FW_CDEV_IOC_(DE)ALLOCATE_ISO_RESOURCE(_ONCE) ioctl
 * @type:	%FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
 *		%FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
 * @handle:	Reference by which an allocated resource can be deallocated
 * @channel:	Isochronous channel which was (de)allocated, if any
 * @bandwidth:	Bandwidth allocation units which were (de)allocated, if any
 *
 * An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event is sent after an isochronous
 * resource was allocated at the IRM.  The client has to check @channel and
 * @bandwidth for whether the allocation actually succeeded.
 *
 * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event is sent after an isochronous
 * resource was deallocated at the IRM.  It is also sent when automatic
 * reallocation after a bus reset failed.
 *
 * @channel is <0 if no channel was (de)allocated or if reallocation failed.
 * @bandwidth is 0 if no bandwidth was (de)allocated or if reallocation failed.
 */
struct fw_cdev_event_iso_resource {
	__u64 closure;
	__u32 type;
	__u32 handle;
	__s32 channel;
	__s32 bandwidth;
};

/**
 * union fw_cdev_event - Convenience union of fw_cdev_event_ types
 * @common:        Valid for all types
 * @bus_reset:     Valid if @common.type == %FW_CDEV_EVENT_BUS_RESET
 * @response:      Valid if @common.type == %FW_CDEV_EVENT_RESPONSE
 * @request:       Valid if @common.type == %FW_CDEV_EVENT_REQUEST
 * @request2:      Valid if @common.type == %FW_CDEV_EVENT_REQUEST2
 * @iso_interrupt: Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT
 * @iso_resource:  Valid if @common.type ==
 *				%FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
 *				%FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
 *
 * Convenience union for userspace use.  Events could be read(2) into an
 * appropriately aligned char buffer and then cast to this union for further
 * processing.  Note that for a request, response or iso_interrupt event,
 * the data[] or header[] may make the size of the full event larger than
 * sizeof(union fw_cdev_event).  Also note that if you attempt to read(2)
 * an event into a buffer that is not large enough for it, the data that does
 * not fit will be discarded so that the next read(2) will return a new event.
 */
union fw_cdev_event {
	struct fw_cdev_event_common		common;
	struct fw_cdev_event_bus_reset		bus_reset;
	struct fw_cdev_event_response		response;
	struct fw_cdev_event_request		request;
	struct fw_cdev_event_request2		request2;     /* added in 2.6.36 */
	struct fw_cdev_event_iso_interrupt	iso_interrupt;
	struct fw_cdev_event_iso_resource	iso_resource; /* added in 2.6.30 */
};

/* available since kernel version 2.6.22 */
#define FW_CDEV_IOC_GET_INFO           _IOWR('#', 0x00, struct fw_cdev_get_info)
#define FW_CDEV_IOC_SEND_REQUEST        _IOW('#', 0x01, struct fw_cdev_send_request)
#define FW_CDEV_IOC_ALLOCATE           _IOWR('#', 0x02, struct fw_cdev_allocate)
#define FW_CDEV_IOC_DEALLOCATE          _IOW('#', 0x03, struct fw_cdev_deallocate)
#define FW_CDEV_IOC_SEND_RESPONSE       _IOW('#', 0x04, struct fw_cdev_send_response)
#define FW_CDEV_IOC_INITIATE_BUS_RESET  _IOW('#', 0x05, struct fw_cdev_initiate_bus_reset)
#define FW_CDEV_IOC_ADD_DESCRIPTOR     _IOWR('#', 0x06, struct fw_cdev_add_descriptor)
#define FW_CDEV_IOC_REMOVE_DESCRIPTOR   _IOW('#', 0x07, struct fw_cdev_remove_descriptor)
#define FW_CDEV_IOC_CREATE_ISO_CONTEXT _IOWR('#', 0x08, struct fw_cdev_create_iso_context)
#define FW_CDEV_IOC_QUEUE_ISO          _IOWR('#', 0x09, struct fw_cdev_queue_iso)
#define FW_CDEV_IOC_START_ISO           _IOW('#', 0x0a, struct fw_cdev_start_iso)
#define FW_CDEV_IOC_STOP_ISO            _IOW('#', 0x0b, struct fw_cdev_stop_iso)

/* available since kernel version 2.6.24 */
#define FW_CDEV_IOC_GET_CYCLE_TIMER     _IOR('#', 0x0c, struct fw_cdev_get_cycle_timer)

/* available since kernel version 2.6.30 */
#define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE       _IOWR('#', 0x0d, struct fw_cdev_allocate_iso_resource)
#define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE      _IOW('#', 0x0e, struct fw_cdev_deallocate)
#define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE   _IOW('#', 0x0f, struct fw_cdev_allocate_iso_resource)
#define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x10, struct fw_cdev_allocate_iso_resource)
#define FW_CDEV_IOC_GET_SPEED                     _IO('#', 0x11) /* returns speed code */
#define FW_CDEV_IOC_SEND_BROADCAST_REQUEST       _IOW('#', 0x12, struct fw_cdev_send_request)
#define FW_CDEV_IOC_SEND_STREAM_PACKET           _IOW('#', 0x13, struct fw_cdev_send_stream_packet)

/* available since kernel version 2.6.34 */
#define FW_CDEV_IOC_GET_CYCLE_TIMER2   _IOWR('#', 0x14, struct fw_cdev_get_cycle_timer2)

/*
 * ABI version history
 *  1  (2.6.22)  - initial version
 *     (2.6.24)  - added %FW_CDEV_IOC_GET_CYCLE_TIMER
 *  2  (2.6.30)  - changed &fw_cdev_event_iso_interrupt.header if
 *                 &fw_cdev_create_iso_context.header_size is 8 or more
 *               - added %FW_CDEV_IOC_*_ISO_RESOURCE*,
 *                 %FW_CDEV_IOC_GET_SPEED, %FW_CDEV_IOC_SEND_BROADCAST_REQUEST,
 *                 %FW_CDEV_IOC_SEND_STREAM_PACKET
 *     (2.6.32)  - added time stamp to xmit &fw_cdev_event_iso_interrupt
 *     (2.6.33)  - IR has always packet-per-buffer semantics now, not one of
 *                 dual-buffer or packet-per-buffer depending on hardware
 *               - shared use and auto-response for FCP registers
 *  3  (2.6.34)  - made &fw_cdev_get_cycle_timer reliable
 *               - added %FW_CDEV_IOC_GET_CYCLE_TIMER2
 *  4  (2.6.36)  - added %FW_CDEV_EVENT_REQUEST2
 */
#define FW_CDEV_VERSION 3 /* Meaningless; don't use this macro. */

/**
 * struct fw_cdev_get_info - General purpose information ioctl
 * @version:	The version field is just a running serial number.  Both an
 *		input parameter (ABI version implemented by the client) and
 *		output parameter (ABI version implemented by the kernel).
 *		A client must not fill in an %FW_CDEV_VERSION defined from an
 *		included kernel header file but the actual version for which
 *		the client was implemented.  This is necessary for forward
 *		compatibility.  We never break backwards compatibility, but
 *		may add more structs, events, and ioctls in later revisions.
 * @rom_length:	If @rom is non-zero, at most rom_length bytes of configuration
 *		ROM will be copied into that user space address.  In either
 *		case, @rom_length is updated with the actual length of the
 *		configuration ROM.
 * @rom:	If non-zero, address of a buffer to be filled by a copy of the
 *		device's configuration ROM
 * @bus_reset:	If non-zero, address of a buffer to be filled by a
 *		&struct fw_cdev_event_bus_reset with the current state
 *		of the bus.  This does not cause a bus reset to happen.
 * @bus_reset_closure: Value of &closure in this and subsequent bus reset events
 * @card:	The index of the card this device belongs to
 */
struct fw_cdev_get_info {
	__u32 version;
	__u32 rom_length;
	__u64 rom;
	__u64 bus_reset;
	__u64 bus_reset_closure;
	__u32 card;
};

/**
 * struct fw_cdev_send_request - Send an asynchronous request packet
 * @tcode:	Transaction code of the request
 * @length:	Length of outgoing payload, in bytes
 * @offset:	48-bit offset at destination node
 * @closure:	Passed back to userspace in the response event
 * @data:	Userspace pointer to payload
 * @generation:	The bus generation where packet is valid
 *
 * Send a request to the device.  This ioctl implements all outgoing requests.
 * Both quadlet and block request specify the payload as a pointer to the data
 * in the @data field.  Once the transaction completes, the kernel writes an
 * &fw_cdev_event_response event back.  The @closure field is passed back to
 * user space in the response event.
 */
struct fw_cdev_send_request {
	__u32 tcode;
	__u32 length;
	__u64 offset;
	__u64 closure;
	__u64 data;
	__u32 generation;
};

/**
 * struct fw_cdev_send_response - Send an asynchronous response packet
 * @rcode:	Response code as determined by the userspace handler
 * @length:	Length of outgoing payload, in bytes
 * @data:	Userspace pointer to payload
 * @handle:	The handle from the &fw_cdev_event_request
 *
 * Send a response to an incoming request.  By setting up an address range using
 * the %FW_CDEV_IOC_ALLOCATE ioctl, userspace can listen for incoming requests.  An
 * incoming request will generate an %FW_CDEV_EVENT_REQUEST, and userspace must
 * send a reply using this ioctl.  The event has a handle to the kernel-side
 * pending transaction, which should be used with this ioctl.
 */
struct fw_cdev_send_response {
	__u32 rcode;
	__u32 length;
	__u64 data;
	__u32 handle;
};

/**
 * struct fw_cdev_allocate - Allocate a CSR address range
 * @offset:	Start offset of the address range
 * @closure:	To be passed back to userspace in request events
 * @length:	Length of the address range, in bytes
 * @handle:	Handle to the allocation, written by the kernel
 *
 * Allocate an address range in the 48-bit address space on the local node
 * (the controller).  This allows userspace to listen for requests with an
 * offset within that address range.  When the kernel receives a request
 * within the range, an &fw_cdev_event_request event will be written back.
 * The @closure field is passed back to userspace in the response event.
 * The @handle field is an out parameter, returning a handle to the allocated
 * range to be used for later deallocation of the range.
 *
 * The address range is allocated on all local nodes.  The address allocation
 * is exclusive except for the FCP command and response registers.
 */
struct fw_cdev_allocate {
	__u64 offset;
	__u64 closure;
	__u32 length;
	__u32 handle;
};

/**
 * struct fw_cdev_deallocate - Free a CSR address range or isochronous resource
 * @handle:	Handle to the address range or iso resource, as returned by the
 *		kernel when the range or resource was allocated
 */
struct fw_cdev_deallocate {
	__u32 handle;
};

#define FW_CDEV_LONG_RESET	0
#define FW_CDEV_SHORT_RESET	1

/**
 * struct fw_cdev_initiate_bus_reset - Initiate a bus reset
 * @type:	%FW_CDEV_SHORT_RESET or %FW_CDEV_LONG_RESET
 *
 * Initiate a bus reset for the bus this device is on.  The bus reset can be
 * either the original (long) bus reset or the arbitrated (short) bus reset
 * introduced in 1394a-2000.
 */
struct fw_cdev_initiate_bus_reset {
	__u32 type;	/* FW_CDEV_SHORT_RESET or FW_CDEV_LONG_RESET */
};

/**
 * struct fw_cdev_add_descriptor - Add contents to the local node's config ROM
 * @immediate:	If non-zero, immediate key to insert before pointer
 * @key:	Upper 8 bits of root directory pointer
 * @data:	Userspace pointer to contents of descriptor block
 * @length:	Length of descriptor block data, in quadlets
 * @handle:	Handle to the descriptor, written by the kernel
 *
 * Add a descriptor block and optionally a preceding immediate key to the local
 * node's configuration ROM.
 *
 * The @key field specifies the upper 8 bits of the descriptor root directory
 * pointer and the @data and @length fields specify the contents. The @key
 * should be of the form 0xXX000000. The offset part of the root directory entry
 * will be filled in by the kernel.
 *
 * If not 0, the @immediate field specifies an immediate key which will be
 * inserted before the root directory pointer.
 *
 * @immediate, @key, and @data array elements are CPU-endian quadlets.
 *
 * If successful, the kernel adds the descriptor and writes back a handle to the
 * kernel-side object to be used for later removal of the descriptor block and
 * immediate key.
 *
 * This ioctl affects the configuration ROMs of all local nodes.
 * The ioctl only succeeds on device files which represent a local node.
 */
struct fw_cdev_add_descriptor {
	__u32 immediate;
	__u32 key;
	__u64 data;
	__u32 length;
	__u32 handle;
};

/**
 * struct fw_cdev_remove_descriptor - Remove contents from the configuration ROM
 * @handle:	Handle to the descriptor, as returned by the kernel when the
 *		descriptor was added
 *
 * Remove a descriptor block and accompanying immediate key from the local
 * nodes' configuration ROMs.
 */
struct fw_cdev_remove_descriptor {
	__u32 handle;
};

#define FW_CDEV_ISO_CONTEXT_TRANSMIT	0
#define FW_CDEV_ISO_CONTEXT_RECEIVE	1

/**
 * struct fw_cdev_create_iso_context - Create a context for isochronous IO
 * @type:	%FW_CDEV_ISO_CONTEXT_TRANSMIT or %FW_CDEV_ISO_CONTEXT_RECEIVE
 * @header_size: Header size to strip for receive contexts
 * @channel:	Channel to bind to
 * @speed:	Speed for transmit contexts
 * @closure:	To be returned in &fw_cdev_event_iso_interrupt
 * @handle:	Handle to context, written back by kernel
 *
 * Prior to sending or receiving isochronous I/O, a context must be created.
 * The context records information about the transmit or receive configuration
 * and typically maps to an underlying hardware resource.  A context is set up
 * for either sending or receiving.  It is bound to a specific isochronous
 * channel.
 *
 * If a context was successfully created, the kernel writes back a handle to the
 * context, which must be passed in for subsequent operations on that context.
 *
 * For receive contexts, @header_size must be at least 4 and must be a multiple
 * of 4.
 *
 * Note that the effect of a @header_size > 4 depends on
 * &fw_cdev_get_info.version, as documented at &fw_cdev_event_iso_interrupt.
 */
struct fw_cdev_create_iso_context {
	__u32 type;
	__u32 header_size;
	__u32 channel;
	__u32 speed;
	__u64 closure;
	__u32 handle;
};

#define FW_CDEV_ISO_PAYLOAD_LENGTH(v)	(v)
#define FW_CDEV_ISO_INTERRUPT		(1 << 16)
#define FW_CDEV_ISO_SKIP		(1 << 17)
#define FW_CDEV_ISO_SYNC		(1 << 17)
#define FW_CDEV_ISO_TAG(v)		((v) << 18)
#define FW_CDEV_ISO_SY(v)		((v) << 20)
#define FW_CDEV_ISO_HEADER_LENGTH(v)	((v) << 24)

/**
 * struct fw_cdev_iso_packet - Isochronous packet
 * @control:	Contains the header length (8 uppermost bits), the sy field
 *		(4 bits), the tag field (2 bits), a sync flag (1 bit),
 *		a skip flag (1 bit), an interrupt flag (1 bit), and the
 *		payload length (16 lowermost bits)
 * @header:	Header and payload
 *
 * &struct fw_cdev_iso_packet is used to describe isochronous packet queues.
 *
 * Use the FW_CDEV_ISO_ macros to fill in @control.
 *
 * For transmit packets, the header length must be a multiple of 4 and specifies
 * the numbers of bytes in @header that will be prepended to the packet's
 * payload; these bytes are copied into the kernel and will not be accessed
 * after the ioctl has returned.  The sy and tag fields are copied to the iso
 * packet header (these fields are specified by IEEE 1394a and IEC 61883-1).
 * The skip flag specifies that no packet is to be sent in a frame; when using
 * this, all other fields except the interrupt flag must be zero.
 *
 * For receive packets, the header length must be a multiple of the context's
 * header size; if the header length is larger than the context's header size,
 * multiple packets are queued for this entry.  The sy and tag fields are
 * ignored.  If the sync flag is set, the context drops all packets until
 * a packet with a matching sy field is received (the sync value to wait for is
 * specified in the &fw_cdev_start_iso structure).  The payload length defines
 * how many payload bytes can be received for one packet (in addition to payload
 * quadlets that have been defined as headers and are stripped and returned in
 * the &fw_cdev_event_iso_interrupt structure).  If more bytes are received, the
 * additional bytes are dropped.  If less bytes are received, the remaining
 * bytes in this part of the payload buffer will not be written to, not even by
 * the next packet, i.e., packets received in consecutive frames will not
 * necessarily be consecutive in memory.  If an entry has queued multiple
 * packets, the payload length is divided equally among them.
 *
 * When a packet with the interrupt flag set has been completed, the
 * &fw_cdev_event_iso_interrupt event will be sent.  An entry that has queued
 * multiple receive packets is completed when its last packet is completed.
 */
struct fw_cdev_iso_packet {
	__u32 control;
	__u32 header[0];
};

/**
 * struct fw_cdev_queue_iso - Queue isochronous packets for I/O
 * @packets:	Userspace pointer to packet data
 * @data:	Pointer into mmap()'ed payload buffer
 * @size:	Size of packet data in bytes
 * @handle:	Isochronous context handle
 *
 * Queue a number of isochronous packets for reception or transmission.
 * This ioctl takes a pointer to an array of &fw_cdev_iso_packet structs,
 * which describe how to transmit from or receive into a contiguous region
 * of a mmap()'ed payload buffer.  As part of transmit packet descriptors,
 * a series of headers can be supplied, which will be prepended to the
 * payload during DMA.
 *
 * The kernel may or may not queue all packets, but will write back updated
 * values of the @packets, @data and @size fields, so the ioctl can be
 * resubmitted easily.
 */
struct fw_cdev_queue_iso {
	__u64 packets;
	__u64 data;
	__u32 size;
	__u32 handle;
};

#define FW_CDEV_ISO_CONTEXT_MATCH_TAG0		 1
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG1		 2
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG2		 4
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG3		 8
#define FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS	15

/**
 * struct fw_cdev_start_iso - Start an isochronous transmission or reception
 * @cycle:	Cycle in which to start I/O.  If @cycle is greater than or
 *		equal to 0, the I/O will start on that cycle.
 * @sync:	Determines the value to wait for for receive packets that have
 *		the %FW_CDEV_ISO_SYNC bit set
 * @tags:	Tag filter bit mask.  Only valid for isochronous reception.
 *		Determines the tag values for which packets will be accepted.
 *		Use FW_CDEV_ISO_CONTEXT_MATCH_ macros to set @tags.
 * @handle:	Isochronous context handle within which to transmit or receive
 */
struct fw_cdev_start_iso {
	__s32 cycle;
	__u32 sync;
	__u32 tags;
	__u32 handle;
};

/**
 * struct fw_cdev_stop_iso - Stop an isochronous transmission or reception
 * @handle:	Handle of isochronous context to stop
 */
struct fw_cdev_stop_iso {
	__u32 handle;
};

/**
 * struct fw_cdev_get_cycle_timer - read cycle timer register
 * @local_time:   system time, in microseconds since the Epoch
 * @cycle_timer:  Cycle Time register contents
 *
 * The %FW_CDEV_IOC_GET_CYCLE_TIMER ioctl reads the isochronous cycle timer
 * and also the system clock (%CLOCK_REALTIME).  This allows to express the
 * receive time of an isochronous packet as a system time.
 *
 * @cycle_timer consists of 7 bits cycleSeconds, 13 bits cycleCount, and
 * 12 bits cycleOffset, in host byte order.  Cf. the Cycle Time register
 * per IEEE 1394 or Isochronous Cycle Timer register per OHCI-1394.
 *
 * In version 1 and 2 of the ABI, this ioctl returned unreliable (non-
 * monotonic) @cycle_timer values on certain controllers.
 */
struct fw_cdev_get_cycle_timer {
	__u64 local_time;
	__u32 cycle_timer;
};

/**
 * struct fw_cdev_get_cycle_timer2 - read cycle timer register
 * @tv_sec:       system time, seconds
 * @tv_nsec:      system time, sub-seconds part in nanoseconds
 * @clk_id:       input parameter, clock from which to get the system time
 * @cycle_timer:  Cycle Time register contents
 *
 * The %FW_CDEV_IOC_GET_CYCLE_TIMER2 works like
 * %FW_CDEV_IOC_GET_CYCLE_TIMER but lets you choose a clock like with POSIX'
 * clock_gettime function.  Supported @clk_id values are POSIX' %CLOCK_REALTIME
 * and %CLOCK_MONOTONIC and Linux' %CLOCK_MONOTONIC_RAW.
 */
struct fw_cdev_get_cycle_timer2 {
	__s64 tv_sec;
	__s32 tv_nsec;
	__s32 clk_id;
	__u32 cycle_timer;
};

/**
 * struct fw_cdev_allocate_iso_resource - (De)allocate a channel or bandwidth
 * @closure:	Passed back to userspace in correponding iso resource events
 * @channels:	Isochronous channels of which one is to be (de)allocated
 * @bandwidth:	Isochronous bandwidth units to be (de)allocated
 * @handle:	Handle to the allocation, written by the kernel (only valid in
 *		case of %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctls)
 *
 * The %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctl initiates allocation of an
 * isochronous channel and/or of isochronous bandwidth at the isochronous
 * resource manager (IRM).  Only one of the channels specified in @channels is
 * allocated.  An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED is sent after
 * communication with the IRM, indicating success or failure in the event data.
 * The kernel will automatically reallocate the resources after bus resets.
 * Should a reallocation fail, an %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event
 * will be sent.  The kernel will also automatically deallocate the resources
 * when the file descriptor is closed.
 *
 * The %FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE ioctl can be used to initiate
 * deallocation of resources which were allocated as described above.
 * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event concludes this operation.
 *
 * The %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE ioctl is a variant of allocation
 * without automatic re- or deallocation.
 * An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event concludes this operation,
 * indicating success or failure in its data.
 *
 * The %FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE ioctl works like
 * %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE except that resources are freed
 * instead of allocated.
 * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event concludes this operation.
 *
 * To summarize, %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE allocates iso resources
 * for the lifetime of the fd or @handle.
 * In contrast, %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE allocates iso resources
 * for the duration of a bus generation.
 *
 * @channels is a host-endian bitfield with the least significant bit
 * representing channel 0 and the most significant bit representing channel 63:
 * 1ULL << c for each channel c that is a candidate for (de)allocation.
 *
 * @bandwidth is expressed in bandwidth allocation units, i.e. the time to send
 * one quadlet of data (payload or header data) at speed S1600.
 */
struct fw_cdev_allocate_iso_resource {
	__u64 closure;
	__u64 channels;
	__u32 bandwidth;
	__u32 handle;
};

/**
 * struct fw_cdev_send_stream_packet - send an asynchronous stream packet
 * @length:	Length of outgoing payload, in bytes
 * @tag:	Data format tag
 * @channel:	Isochronous channel to transmit to
 * @sy:		Synchronization code
 * @closure:	Passed back to userspace in the response event
 * @data:	Userspace pointer to payload
 * @generation:	The bus generation where packet is valid
 * @speed:	Speed to transmit at
 *
 * The %FW_CDEV_IOC_SEND_STREAM_PACKET ioctl sends an asynchronous stream packet
 * to every device which is listening to the specified channel.  The kernel
 * writes an &fw_cdev_event_response event which indicates success or failure of
 * the transmission.
 */
struct fw_cdev_send_stream_packet {
	__u32 length;
	__u32 tag;
	__u32 channel;
	__u32 sy;
	__u64 closure;
	__u64 data;
	__u32 generation;
	__u32 speed;
};

#endif /* _LINUX_FIREWIRE_CDEV_H */

Privacy Policy