summaryrefslogtreecommitdiff
path: root/include/linux/firewire-cdev.h
blob: 0f0e271f97fa1f0fa7248cafc9c579e8be20fe00 (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
/*
 * 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

/**
 * 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 - 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_REQUEST
 * @tcode:	Transaction code of the incoming request
 * @offset:	The offset into the 48-bit per-node address space
 * @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.
 */
struct fw_cdev_event_request {
	__u64 closure;
	__u32 type;
	__u32 tcode;
	__u64 offset;
	__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.  In the receive case, the headers
 * stripped of all packets up until and including the interrupt packet are
 * returned in the @header field.
 */
struct fw_cdev_event_iso_interrupt {
	__u64 closure;
	__u32 type;
	__u32 cycle;
	__u32 header_length;
	__u32 header[0];
};

/**
 * 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
 * @iso_interrupt: Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT
 *
 * Convenience union for userspace use.  Events could be read(2) into a char
 * buffer and then cast to this union for further processing.
 */
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_iso_interrupt iso_interrupt;
};

#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)
#define FW_CDEV_IOC_GET_CYCLE_TIMER	_IOR('#', 0x0c, struct fw_cdev_get_cycle_timer)

/* FW_CDEV_VERSION History
 *
 * 1	Feb 18, 2007:  Initial version.
 */
#define FW_CDEV_VERSION		1

/**
 * struct fw_cdev_get_info - General purpose information ioctl
 * @version:	The version field is just a running serial number.
 *		We never break backwards compatibility, but may add more
 *		structs 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
 *		local node'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_request 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.
 */
struct fw_cdev_allocate {
	__u64 offset;
	__u64 closure;
	__u32 length;
	__u32 handle;
};

/**
 * struct fw_cdev_deallocate - Free an address range allocation
 * @handle:	Handle to the address range, as returned by the kernel when the
 *		range 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 bytes
 * @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.
 *
 * 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.
 */
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
 * node's configuration ROM.
 */
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 to transmit at
 * @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.
 */
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.  The sy and tag fields are
 * specified by IEEE 1394a and IEC 61883.
 *
 * FIXME - finish this documentation
 */
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 the 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:  isochronous cycle timer, as per OHCI 1.1 clause 5.13
 *
 * The %FW_CDEV_IOC_GET_CYCLE_TIMER ioctl reads the isochronous cycle timer
 * and also the system clock.  This allows to express the receive time of an
 * isochronous packet as a system time with microsecond accuracy.
 */
struct fw_cdev_get_cycle_timer {
	__u64 local_time;
	__u32 cycle_timer;
};

#endif /* _LINUX_FIREWIRE_CDEV_H */