1 /*
2  * Char device interface.
3  *
4  * Copyright (C) 2005-2007  Kristian Hoegsberg <krh@bitplanet.net>
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice (including the next
14  * paragraph) shall be included in all copies or substantial portions of the
15  * Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23  * DEALINGS IN THE SOFTWARE.
24  */
25 
26 #ifndef _LINUX_FIREWIRE_CDEV_H
27 #define _LINUX_FIREWIRE_CDEV_H
28 
29 #include <linux/ioctl.h>
30 #include <linux/types.h>
31 #include <linux/firewire-constants.h>
32 
33 /* available since kernel version 2.6.22 */
34 #define FW_CDEV_EVENT_BUS_RESET				0x00
35 #define FW_CDEV_EVENT_RESPONSE				0x01
36 #define FW_CDEV_EVENT_REQUEST				0x02
37 #define FW_CDEV_EVENT_ISO_INTERRUPT			0x03
38 
39 /* available since kernel version 2.6.30 */
40 #define FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED		0x04
41 #define FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED		0x05
42 
43 /* available since kernel version 2.6.36 */
44 #define FW_CDEV_EVENT_REQUEST2				0x06
45 #define FW_CDEV_EVENT_PHY_PACKET_SENT			0x07
46 #define FW_CDEV_EVENT_PHY_PACKET_RECEIVED		0x08
47 #define FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL	0x09
48 
49 /**
50  * struct fw_cdev_event_common - Common part of all fw_cdev_event_ types
51  * @closure:	For arbitrary use by userspace
52  * @type:	Discriminates the fw_cdev_event_ types
53  *
54  * This struct may be used to access generic members of all fw_cdev_event_
55  * types regardless of the specific type.
56  *
57  * Data passed in the @closure field for a request will be returned in the
58  * corresponding event.  It is big enough to hold a pointer on all platforms.
59  * The ioctl used to set @closure depends on the @type of event.
60  */
61 struct fw_cdev_event_common {
62 	__u64 closure;
63 	__u32 type;
64 };
65 
66 /**
67  * struct fw_cdev_event_bus_reset - Sent when a bus reset occurred
68  * @closure:	See &fw_cdev_event_common; set by %FW_CDEV_IOC_GET_INFO ioctl
69  * @type:	See &fw_cdev_event_common; always %FW_CDEV_EVENT_BUS_RESET
70  * @node_id:       New node ID of this node
71  * @local_node_id: Node ID of the local node, i.e. of the controller
72  * @bm_node_id:    Node ID of the bus manager
73  * @irm_node_id:   Node ID of the iso resource manager
74  * @root_node_id:  Node ID of the root node
75  * @generation:    New bus generation
76  *
77  * This event is sent when the bus the device belongs to goes through a bus
78  * reset.  It provides information about the new bus configuration, such as
79  * new node ID for this device, new root ID, and others.
80  *
81  * If @bm_node_id is 0xffff right after bus reset it can be reread by an
82  * %FW_CDEV_IOC_GET_INFO ioctl after bus manager selection was finished.
83  * Kernels with ABI version < 4 do not set @bm_node_id.
84  */
85 struct fw_cdev_event_bus_reset {
86 	__u64 closure;
87 	__u32 type;
88 	__u32 node_id;
89 	__u32 local_node_id;
90 	__u32 bm_node_id;
91 	__u32 irm_node_id;
92 	__u32 root_node_id;
93 	__u32 generation;
94 };
95 
96 /**
97  * struct fw_cdev_event_response - Sent when a response packet was received
98  * @closure:	See &fw_cdev_event_common; set by %FW_CDEV_IOC_SEND_REQUEST
99  *		or %FW_CDEV_IOC_SEND_BROADCAST_REQUEST
100  *		or %FW_CDEV_IOC_SEND_STREAM_PACKET ioctl
101  * @type:	See &fw_cdev_event_common; always %FW_CDEV_EVENT_RESPONSE
102  * @rcode:	Response code returned by the remote node
103  * @length:	Data length, i.e. the response's payload size in bytes
104  * @data:	Payload data, if any
105  *
106  * This event is sent when the stack receives a response to an outgoing request
107  * sent by %FW_CDEV_IOC_SEND_REQUEST ioctl.  The payload data for responses
108  * carrying data (read and lock responses) follows immediately and can be
109  * accessed through the @data field.
110  *
111  * The event is also generated after conclusions of transactions that do not
112  * involve response packets.  This includes unified write transactions,
113  * broadcast write transactions, and transmission of asynchronous stream
114  * packets.  @rcode indicates success or failure of such transmissions.
115  */
116 struct fw_cdev_event_response {
117 	__u64 closure;
118 	__u32 type;
119 	__u32 rcode;
120 	__u32 length;
121 	__u32 data[0];
122 };
123 
124 /**
125  * struct fw_cdev_event_request - Old version of &fw_cdev_event_request2
126  * @type:	See &fw_cdev_event_common; always %FW_CDEV_EVENT_REQUEST
127  *
128  * This event is sent instead of &fw_cdev_event_request2 if the kernel or
129  * the client implements ABI version <= 3.  &fw_cdev_event_request lacks
130  * essential information; use &fw_cdev_event_request2 instead.
131  */
132 struct fw_cdev_event_request {
133 	__u64 closure;
134 	__u32 type;
135 	__u32 tcode;
136 	__u64 offset;
137 	__u32 handle;
138 	__u32 length;
139 	__u32 data[0];
140 };
141 
142 /**
143  * struct fw_cdev_event_request2 - Sent on incoming request to an address region
144  * @closure:	See &fw_cdev_event_common; set by %FW_CDEV_IOC_ALLOCATE ioctl
145  * @type:	See &fw_cdev_event_common; always %FW_CDEV_EVENT_REQUEST2
146  * @tcode:	Transaction code of the incoming request
147  * @offset:	The offset into the 48-bit per-node address space
148  * @source_node_id: Sender node ID
149  * @destination_node_id: Destination node ID
150  * @card:	The index of the card from which the request came
151  * @generation:	Bus generation in which the request is valid
152  * @handle:	Reference to the kernel-side pending request
153  * @length:	Data length, i.e. the request's payload size in bytes
154  * @data:	Incoming data, if any
155  *
156  * This event is sent when the stack receives an incoming request to an address
157  * region registered using the %FW_CDEV_IOC_ALLOCATE ioctl.  The request is
158  * guaranteed to be completely contained in the specified region.  Userspace is
159  * responsible for sending the response by %FW_CDEV_IOC_SEND_RESPONSE ioctl,
160  * using the same @handle.
161  *
162  * The payload data for requests carrying data (write and lock requests)
163  * follows immediately and can be accessed through the @data field.
164  *
165  * Unlike &fw_cdev_event_request, @tcode of lock requests is one of the
166  * firewire-core specific %TCODE_LOCK_MASK_SWAP...%TCODE_LOCK_VENDOR_DEPENDENT,
167  * i.e. encodes the extended transaction code.
168  *
169  * @card may differ from &fw_cdev_get_info.card because requests are received
170  * from all cards of the Linux host.  @source_node_id, @destination_node_id, and
171  * @generation pertain to that card.  Destination node ID and bus generation may
172  * therefore differ from the corresponding fields of the last
173  * &fw_cdev_event_bus_reset.
174  *
175  * @destination_node_id may also differ from the current node ID because of a
176  * non-local bus ID part or in case of a broadcast write request.  Note, a
177  * client must call an %FW_CDEV_IOC_SEND_RESPONSE ioctl even in case of a
178  * broadcast write request; the kernel will then release the kernel-side pending
179  * request but will not actually send a response packet.
180  *
181  * In case of a write request to FCP_REQUEST or FCP_RESPONSE, the kernel already
182  * sent a write response immediately after the request was received; in this
183  * case the client must still call an %FW_CDEV_IOC_SEND_RESPONSE ioctl to
184  * release the kernel-side pending request, though another response won't be
185  * sent.
186  *
187  * If the client subsequently needs to initiate requests to the sender node of
188  * an &fw_cdev_event_request2, it needs to use a device file with matching
189  * card index, node ID, and generation for outbound requests.
190  */
191 struct fw_cdev_event_request2 {
192 	__u64 closure;
193 	__u32 type;
194 	__u32 tcode;
195 	__u64 offset;
196 	__u32 source_node_id;
197 	__u32 destination_node_id;
198 	__u32 card;
199 	__u32 generation;
200 	__u32 handle;
201 	__u32 length;
202 	__u32 data[0];
203 };
204 
205 /**
206  * struct fw_cdev_event_iso_interrupt - Sent when an iso packet was completed
207  * @closure:	See &fw_cdev_event_common;
208  *		set by %FW_CDEV_CREATE_ISO_CONTEXT ioctl
209  * @type:	See &fw_cdev_event_common; always %FW_CDEV_EVENT_ISO_INTERRUPT
210  * @cycle:	Cycle counter of the last completed packet
211  * @header_length: Total length of following headers, in bytes
212  * @header:	Stripped headers, if any
213  *
214  * This event is sent when the controller has completed an &fw_cdev_iso_packet
215  * with the %FW_CDEV_ISO_INTERRUPT bit set, when explicitly requested with
216  * %FW_CDEV_IOC_FLUSH_ISO, or when there have been so many completed packets
217  * without the interrupt bit set that the kernel's internal buffer for @header
218  * is about to overflow.  (In the last case, ABI versions < 5 drop header data
219  * up to the next interrupt packet.)
220  *
221  * Isochronous transmit events (context type %FW_CDEV_ISO_CONTEXT_TRANSMIT):
222  *
223  * In version 3 and some implementations of version 2 of the ABI, &header_length
224  * is a multiple of 4 and &header contains timestamps of all packets up until
225  * the interrupt packet.  The format of the timestamps is as described below for
226  * isochronous reception.  In version 1 of the ABI, &header_length was 0.
227  *
228  * Isochronous receive events (context type %FW_CDEV_ISO_CONTEXT_RECEIVE):
229  *
230  * The headers stripped of all packets up until and including the interrupt
231  * packet are returned in the @header field.  The amount of header data per
232  * packet is as specified at iso context creation by
233  * &fw_cdev_create_iso_context.header_size.
234  *
235  * Hence, _interrupt.header_length / _context.header_size is the number of
236  * packets received in this interrupt event.  The client can now iterate
237  * through the mmap()'ed DMA buffer according to this number of packets and
238  * to the buffer sizes as the client specified in &fw_cdev_queue_iso.
239  *
240  * Since version 2 of this ABI, the portion for each packet in _interrupt.header
241  * consists of the 1394 isochronous packet header, followed by a timestamp
242  * quadlet if &fw_cdev_create_iso_context.header_size > 4, followed by quadlets
243  * from the packet payload if &fw_cdev_create_iso_context.header_size > 8.
244  *
245  * Format of 1394 iso packet header:  16 bits data_length, 2 bits tag, 6 bits
246  * channel, 4 bits tcode, 4 bits sy, in big endian byte order.
247  * data_length is the actual received size of the packet without the four
248  * 1394 iso packet header bytes.
249  *
250  * Format of timestamp:  16 bits invalid, 3 bits cycleSeconds, 13 bits
251  * cycleCount, in big endian byte order.
252  *
253  * In version 1 of the ABI, no timestamp quadlet was inserted; instead, payload
254  * data followed directly after the 1394 is header if header_size > 4.
255  * Behaviour of ver. 1 of this ABI is no longer available since ABI ver. 2.
256  */
257 struct fw_cdev_event_iso_interrupt {
258 	__u64 closure;
259 	__u32 type;
260 	__u32 cycle;
261 	__u32 header_length;
262 	__u32 header[0];
263 };
264 
265 /**
266  * struct fw_cdev_event_iso_interrupt_mc - An iso buffer chunk was completed
267  * @closure:	See &fw_cdev_event_common;
268  *		set by %FW_CDEV_CREATE_ISO_CONTEXT ioctl
269  * @type:	%FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL
270  * @completed:	Offset into the receive buffer; data before this offset is valid
271  *
272  * This event is sent in multichannel contexts (context type
273  * %FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL) for &fw_cdev_iso_packet buffer
274  * chunks that have been completely filled and that have the
275  * %FW_CDEV_ISO_INTERRUPT bit set, or when explicitly requested with
276  * %FW_CDEV_IOC_FLUSH_ISO.
277  *
278  * The buffer is continuously filled with the following data, per packet:
279  *  - the 1394 iso packet header as described at &fw_cdev_event_iso_interrupt,
280  *    but in little endian byte order,
281  *  - packet payload (as many bytes as specified in the data_length field of
282  *    the 1394 iso packet header) in big endian byte order,
283  *  - 0...3 padding bytes as needed to align the following trailer quadlet,
284  *  - trailer quadlet, containing the reception timestamp as described at
285  *    &fw_cdev_event_iso_interrupt, but in little endian byte order.
286  *
287  * Hence the per-packet size is data_length (rounded up to a multiple of 4) + 8.
288  * When processing the data, stop before a packet that would cross the
289  * @completed offset.
290  *
291  * A packet near the end of a buffer chunk will typically spill over into the
292  * next queued buffer chunk.  It is the responsibility of the client to check
293  * for this condition, assemble a broken-up packet from its parts, and not to
294  * re-queue any buffer chunks in which as yet unread packet parts reside.
295  */
296 struct fw_cdev_event_iso_interrupt_mc {
297 	__u64 closure;
298 	__u32 type;
299 	__u32 completed;
300 };
301 
302 /**
303  * struct fw_cdev_event_iso_resource - Iso resources were allocated or freed
304  * @closure:	See &fw_cdev_event_common;
305  *		set by %FW_CDEV_IOC_(DE)ALLOCATE_ISO_RESOURCE(_ONCE) ioctl
306  * @type:	%FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
307  *		%FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
308  * @handle:	Reference by which an allocated resource can be deallocated
309  * @channel:	Isochronous channel which was (de)allocated, if any
310  * @bandwidth:	Bandwidth allocation units which were (de)allocated, if any
311  *
312  * An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event is sent after an isochronous
313  * resource was allocated at the IRM.  The client has to check @channel and
314  * @bandwidth for whether the allocation actually succeeded.
315  *
316  * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event is sent after an isochronous
317  * resource was deallocated at the IRM.  It is also sent when automatic
318  * reallocation after a bus reset failed.
319  *
320  * @channel is <0 if no channel was (de)allocated or if reallocation failed.
321  * @bandwidth is 0 if no bandwidth was (de)allocated or if reallocation failed.
322  */
323 struct fw_cdev_event_iso_resource {
324 	__u64 closure;
325 	__u32 type;
326 	__u32 handle;
327 	__s32 channel;
328 	__s32 bandwidth;
329 };
330 
331 /**
332  * struct fw_cdev_event_phy_packet - A PHY packet was transmitted or received
333  * @closure:	See &fw_cdev_event_common; set by %FW_CDEV_IOC_SEND_PHY_PACKET
334  *		or %FW_CDEV_IOC_RECEIVE_PHY_PACKETS ioctl
335  * @type:	%FW_CDEV_EVENT_PHY_PACKET_SENT or %..._RECEIVED
336  * @rcode:	%RCODE_..., indicates success or failure of transmission
337  * @length:	Data length in bytes
338  * @data:	Incoming data
339  *
340  * If @type is %FW_CDEV_EVENT_PHY_PACKET_SENT, @length is 0 and @data empty,
341  * except in case of a ping packet:  Then, @length is 4, and @data[0] is the
342  * ping time in 49.152MHz clocks if @rcode is %RCODE_COMPLETE.
343  *
344  * If @type is %FW_CDEV_EVENT_PHY_PACKET_RECEIVED, @length is 8 and @data
345  * consists of the two PHY packet quadlets, in host byte order.
346  */
347 struct fw_cdev_event_phy_packet {
348 	__u64 closure;
349 	__u32 type;
350 	__u32 rcode;
351 	__u32 length;
352 	__u32 data[0];
353 };
354 
355 /**
356  * union fw_cdev_event - Convenience union of fw_cdev_event_ types
357  * @common:		Valid for all types
358  * @bus_reset:		Valid if @common.type == %FW_CDEV_EVENT_BUS_RESET
359  * @response:		Valid if @common.type == %FW_CDEV_EVENT_RESPONSE
360  * @request:		Valid if @common.type == %FW_CDEV_EVENT_REQUEST
361  * @request2:		Valid if @common.type == %FW_CDEV_EVENT_REQUEST2
362  * @iso_interrupt:	Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT
363  * @iso_interrupt_mc:	Valid if @common.type ==
364  *				%FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL
365  * @iso_resource:	Valid if @common.type ==
366  *				%FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
367  *				%FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
368  * @phy_packet:		Valid if @common.type ==
369  *				%FW_CDEV_EVENT_PHY_PACKET_SENT or
370  *				%FW_CDEV_EVENT_PHY_PACKET_RECEIVED
371  *
372  * Convenience union for userspace use.  Events could be read(2) into an
373  * appropriately aligned char buffer and then cast to this union for further
374  * processing.  Note that for a request, response or iso_interrupt event,
375  * the data[] or header[] may make the size of the full event larger than
376  * sizeof(union fw_cdev_event).  Also note that if you attempt to read(2)
377  * an event into a buffer that is not large enough for it, the data that does
378  * not fit will be discarded so that the next read(2) will return a new event.
379  */
380 union fw_cdev_event {
381 	struct fw_cdev_event_common		common;
382 	struct fw_cdev_event_bus_reset		bus_reset;
383 	struct fw_cdev_event_response		response;
384 	struct fw_cdev_event_request		request;
385 	struct fw_cdev_event_request2		request2;		/* added in 2.6.36 */
386 	struct fw_cdev_event_iso_interrupt	iso_interrupt;
387 	struct fw_cdev_event_iso_interrupt_mc	iso_interrupt_mc;	/* added in 2.6.36 */
388 	struct fw_cdev_event_iso_resource	iso_resource;		/* added in 2.6.30 */
389 	struct fw_cdev_event_phy_packet		phy_packet;		/* added in 2.6.36 */
390 };
391 
392 /* available since kernel version 2.6.22 */
393 #define FW_CDEV_IOC_GET_INFO           _IOWR('#', 0x00, struct fw_cdev_get_info)
394 #define FW_CDEV_IOC_SEND_REQUEST        _IOW('#', 0x01, struct fw_cdev_send_request)
395 #define FW_CDEV_IOC_ALLOCATE           _IOWR('#', 0x02, struct fw_cdev_allocate)
396 #define FW_CDEV_IOC_DEALLOCATE          _IOW('#', 0x03, struct fw_cdev_deallocate)
397 #define FW_CDEV_IOC_SEND_RESPONSE       _IOW('#', 0x04, struct fw_cdev_send_response)
398 #define FW_CDEV_IOC_INITIATE_BUS_RESET  _IOW('#', 0x05, struct fw_cdev_initiate_bus_reset)
399 #define FW_CDEV_IOC_ADD_DESCRIPTOR     _IOWR('#', 0x06, struct fw_cdev_add_descriptor)
400 #define FW_CDEV_IOC_REMOVE_DESCRIPTOR   _IOW('#', 0x07, struct fw_cdev_remove_descriptor)
401 #define FW_CDEV_IOC_CREATE_ISO_CONTEXT _IOWR('#', 0x08, struct fw_cdev_create_iso_context)
402 #define FW_CDEV_IOC_QUEUE_ISO          _IOWR('#', 0x09, struct fw_cdev_queue_iso)
403 #define FW_CDEV_IOC_START_ISO           _IOW('#', 0x0a, struct fw_cdev_start_iso)
404 #define FW_CDEV_IOC_STOP_ISO            _IOW('#', 0x0b, struct fw_cdev_stop_iso)
405 
406 /* available since kernel version 2.6.24 */
407 #define FW_CDEV_IOC_GET_CYCLE_TIMER     _IOR('#', 0x0c, struct fw_cdev_get_cycle_timer)
408 
409 /* available since kernel version 2.6.30 */
410 #define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE       _IOWR('#', 0x0d, struct fw_cdev_allocate_iso_resource)
411 #define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE      _IOW('#', 0x0e, struct fw_cdev_deallocate)
412 #define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE   _IOW('#', 0x0f, struct fw_cdev_allocate_iso_resource)
413 #define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x10, struct fw_cdev_allocate_iso_resource)
414 #define FW_CDEV_IOC_GET_SPEED                     _IO('#', 0x11) /* returns speed code */
415 #define FW_CDEV_IOC_SEND_BROADCAST_REQUEST       _IOW('#', 0x12, struct fw_cdev_send_request)
416 #define FW_CDEV_IOC_SEND_STREAM_PACKET           _IOW('#', 0x13, struct fw_cdev_send_stream_packet)
417 
418 /* available since kernel version 2.6.34 */
419 #define FW_CDEV_IOC_GET_CYCLE_TIMER2   _IOWR('#', 0x14, struct fw_cdev_get_cycle_timer2)
420 
421 /* available since kernel version 2.6.36 */
422 #define FW_CDEV_IOC_SEND_PHY_PACKET    _IOWR('#', 0x15, struct fw_cdev_send_phy_packet)
423 #define FW_CDEV_IOC_RECEIVE_PHY_PACKETS _IOW('#', 0x16, struct fw_cdev_receive_phy_packets)
424 #define FW_CDEV_IOC_SET_ISO_CHANNELS    _IOW('#', 0x17, struct fw_cdev_set_iso_channels)
425 
426 /* available since kernel version 3.4 */
427 #define FW_CDEV_IOC_FLUSH_ISO           _IOW('#', 0x18, struct fw_cdev_flush_iso)
428 
429 /*
430  * ABI version history
431  *  1  (2.6.22)  - initial version
432  *     (2.6.24)  - added %FW_CDEV_IOC_GET_CYCLE_TIMER
433  *  2  (2.6.30)  - changed &fw_cdev_event_iso_interrupt.header if
434  *                 &fw_cdev_create_iso_context.header_size is 8 or more
435  *               - added %FW_CDEV_IOC_*_ISO_RESOURCE*,
436  *                 %FW_CDEV_IOC_GET_SPEED, %FW_CDEV_IOC_SEND_BROADCAST_REQUEST,
437  *                 %FW_CDEV_IOC_SEND_STREAM_PACKET
438  *     (2.6.32)  - added time stamp to xmit &fw_cdev_event_iso_interrupt
439  *     (2.6.33)  - IR has always packet-per-buffer semantics now, not one of
440  *                 dual-buffer or packet-per-buffer depending on hardware
441  *               - shared use and auto-response for FCP registers
442  *  3  (2.6.34)  - made &fw_cdev_get_cycle_timer reliable
443  *               - added %FW_CDEV_IOC_GET_CYCLE_TIMER2
444  *  4  (2.6.36)  - added %FW_CDEV_EVENT_REQUEST2, %FW_CDEV_EVENT_PHY_PACKET_*,
445  *                 and &fw_cdev_allocate.region_end
446  *               - implemented &fw_cdev_event_bus_reset.bm_node_id
447  *               - added %FW_CDEV_IOC_SEND_PHY_PACKET, _RECEIVE_PHY_PACKETS
448  *               - added %FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL,
449  *                 %FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL, and
450  *                 %FW_CDEV_IOC_SET_ISO_CHANNELS
451  *  5  (3.4)     - send %FW_CDEV_EVENT_ISO_INTERRUPT events when needed to
452  *                 avoid dropping data
453  *               - added %FW_CDEV_IOC_FLUSH_ISO
454  */
455 
456 /**
457  * struct fw_cdev_get_info - General purpose information ioctl
458  * @version:	The version field is just a running serial number.  Both an
459  *		input parameter (ABI version implemented by the client) and
460  *		output parameter (ABI version implemented by the kernel).
461  *		A client shall fill in the ABI @version for which the client
462  *		was implemented.  This is necessary for forward compatibility.
463  * @rom_length:	If @rom is non-zero, up to @rom_length bytes of Configuration
464  *		ROM will be copied into that user space address.  In either
465  *		case, @rom_length is updated with the actual length of the
466  *		Configuration ROM.
467  * @rom:	If non-zero, address of a buffer to be filled by a copy of the
468  *		device's Configuration ROM
469  * @bus_reset:	If non-zero, address of a buffer to be filled by a
470  *		&struct fw_cdev_event_bus_reset with the current state
471  *		of the bus.  This does not cause a bus reset to happen.
472  * @bus_reset_closure: Value of &closure in this and subsequent bus reset events
473  * @card:	The index of the card this device belongs to
474  *
475  * The %FW_CDEV_IOC_GET_INFO ioctl is usually the very first one which a client
476  * performs right after it opened a /dev/fw* file.
477  *
478  * As a side effect, reception of %FW_CDEV_EVENT_BUS_RESET events to be read(2)
479  * is started by this ioctl.
480  */
481 struct fw_cdev_get_info {
482 	__u32 version;
483 	__u32 rom_length;
484 	__u64 rom;
485 	__u64 bus_reset;
486 	__u64 bus_reset_closure;
487 	__u32 card;
488 };
489 
490 /**
491  * struct fw_cdev_send_request - Send an asynchronous request packet
492  * @tcode:	Transaction code of the request
493  * @length:	Length of outgoing payload, in bytes
494  * @offset:	48-bit offset at destination node
495  * @closure:	Passed back to userspace in the response event
496  * @data:	Userspace pointer to payload
497  * @generation:	The bus generation where packet is valid
498  *
499  * Send a request to the device.  This ioctl implements all outgoing requests.
500  * Both quadlet and block request specify the payload as a pointer to the data
501  * in the @data field.  Once the transaction completes, the kernel writes an
502  * &fw_cdev_event_response event back.  The @closure field is passed back to
503  * user space in the response event.
504  */
505 struct fw_cdev_send_request {
506 	__u32 tcode;
507 	__u32 length;
508 	__u64 offset;
509 	__u64 closure;
510 	__u64 data;
511 	__u32 generation;
512 };
513 
514 /**
515  * struct fw_cdev_send_response - Send an asynchronous response packet
516  * @rcode:	Response code as determined by the userspace handler
517  * @length:	Length of outgoing payload, in bytes
518  * @data:	Userspace pointer to payload
519  * @handle:	The handle from the &fw_cdev_event_request
520  *
521  * Send a response to an incoming request.  By setting up an address range using
522  * the %FW_CDEV_IOC_ALLOCATE ioctl, userspace can listen for incoming requests.  An
523  * incoming request will generate an %FW_CDEV_EVENT_REQUEST, and userspace must
524  * send a reply using this ioctl.  The event has a handle to the kernel-side
525  * pending transaction, which should be used with this ioctl.
526  */
527 struct fw_cdev_send_response {
528 	__u32 rcode;
529 	__u32 length;
530 	__u64 data;
531 	__u32 handle;
532 };
533 
534 /**
535  * struct fw_cdev_allocate - Allocate a CSR in an address range
536  * @offset:	Start offset of the address range
537  * @closure:	To be passed back to userspace in request events
538  * @length:	Length of the CSR, in bytes
539  * @handle:	Handle to the allocation, written by the kernel
540  * @region_end:	First address above the address range (added in ABI v4, 2.6.36)
541  *
542  * Allocate an address range in the 48-bit address space on the local node
543  * (the controller).  This allows userspace to listen for requests with an
544  * offset within that address range.  Every time when the kernel receives a
545  * request within the range, an &fw_cdev_event_request2 event will be emitted.
546  * (If the kernel or the client implements ABI version <= 3, an
547  * &fw_cdev_event_request will be generated instead.)
548  *
549  * The @closure field is passed back to userspace in these request events.
550  * The @handle field is an out parameter, returning a handle to the allocated
551  * range to be used for later deallocation of the range.
552  *
553  * The address range is allocated on all local nodes.  The address allocation
554  * is exclusive except for the FCP command and response registers.  If an
555  * exclusive address region is already in use, the ioctl fails with errno set
556  * to %EBUSY.
557  *
558  * If kernel and client implement ABI version >= 4, the kernel looks up a free
559  * spot of size @length inside [@offset..@region_end) and, if found, writes
560  * the start address of the new CSR back in @offset.  I.e. @offset is an
561  * in and out parameter.  If this automatic placement of a CSR in a bigger
562  * address range is not desired, the client simply needs to set @region_end
563  * = @offset + @length.
564  *
565  * If the kernel or the client implements ABI version <= 3, @region_end is
566  * ignored and effectively assumed to be @offset + @length.
567  *
568  * @region_end is only present in a kernel header >= 2.6.36.  If necessary,
569  * this can for example be tested by #ifdef FW_CDEV_EVENT_REQUEST2.
570  */
571 struct fw_cdev_allocate {
572 	__u64 offset;
573 	__u64 closure;
574 	__u32 length;
575 	__u32 handle;
576 	__u64 region_end;	/* available since kernel version 2.6.36 */
577 };
578 
579 /**
580  * struct fw_cdev_deallocate - Free a CSR address range or isochronous resource
581  * @handle:	Handle to the address range or iso resource, as returned by the
582  *		kernel when the range or resource was allocated
583  */
584 struct fw_cdev_deallocate {
585 	__u32 handle;
586 };
587 
588 #define FW_CDEV_LONG_RESET	0
589 #define FW_CDEV_SHORT_RESET	1
590 
591 /**
592  * struct fw_cdev_initiate_bus_reset - Initiate a bus reset
593  * @type:	%FW_CDEV_SHORT_RESET or %FW_CDEV_LONG_RESET
594  *
595  * Initiate a bus reset for the bus this device is on.  The bus reset can be
596  * either the original (long) bus reset or the arbitrated (short) bus reset
597  * introduced in 1394a-2000.
598  *
599  * The ioctl returns immediately.  A subsequent &fw_cdev_event_bus_reset
600  * indicates when the reset actually happened.  Since ABI v4, this may be
601  * considerably later than the ioctl because the kernel ensures a grace period
602  * between subsequent bus resets as per IEEE 1394 bus management specification.
603  */
604 struct fw_cdev_initiate_bus_reset {
605 	__u32 type;
606 };
607 
608 /**
609  * struct fw_cdev_add_descriptor - Add contents to the local node's config ROM
610  * @immediate:	If non-zero, immediate key to insert before pointer
611  * @key:	Upper 8 bits of root directory pointer
612  * @data:	Userspace pointer to contents of descriptor block
613  * @length:	Length of descriptor block data, in quadlets
614  * @handle:	Handle to the descriptor, written by the kernel
615  *
616  * Add a descriptor block and optionally a preceding immediate key to the local
617  * node's Configuration ROM.
618  *
619  * The @key field specifies the upper 8 bits of the descriptor root directory
620  * pointer and the @data and @length fields specify the contents. The @key
621  * should be of the form 0xXX000000. The offset part of the root directory entry
622  * will be filled in by the kernel.
623  *
624  * If not 0, the @immediate field specifies an immediate key which will be
625  * inserted before the root directory pointer.
626  *
627  * @immediate, @key, and @data array elements are CPU-endian quadlets.
628  *
629  * If successful, the kernel adds the descriptor and writes back a @handle to
630  * the kernel-side object to be used for later removal of the descriptor block
631  * and immediate key.  The kernel will also generate a bus reset to signal the
632  * change of the Configuration ROM to other nodes.
633  *
634  * This ioctl affects the Configuration ROMs of all local nodes.
635  * The ioctl only succeeds on device files which represent a local node.
636  */
637 struct fw_cdev_add_descriptor {
638 	__u32 immediate;
639 	__u32 key;
640 	__u64 data;
641 	__u32 length;
642 	__u32 handle;
643 };
644 
645 /**
646  * struct fw_cdev_remove_descriptor - Remove contents from the Configuration ROM
647  * @handle:	Handle to the descriptor, as returned by the kernel when the
648  *		descriptor was added
649  *
650  * Remove a descriptor block and accompanying immediate key from the local
651  * nodes' Configuration ROMs.  The kernel will also generate a bus reset to
652  * signal the change of the Configuration ROM to other nodes.
653  */
654 struct fw_cdev_remove_descriptor {
655 	__u32 handle;
656 };
657 
658 #define FW_CDEV_ISO_CONTEXT_TRANSMIT			0
659 #define FW_CDEV_ISO_CONTEXT_RECEIVE			1
660 #define FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL	2 /* added in 2.6.36 */
661 
662 /**
663  * struct fw_cdev_create_iso_context - Create a context for isochronous I/O
664  * @type:	%FW_CDEV_ISO_CONTEXT_TRANSMIT or %FW_CDEV_ISO_CONTEXT_RECEIVE or
665  *		%FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL
666  * @header_size: Header size to strip in single-channel reception
667  * @channel:	Channel to bind to in single-channel reception or transmission
668  * @speed:	Transmission speed
669  * @closure:	To be returned in &fw_cdev_event_iso_interrupt or
670  *		&fw_cdev_event_iso_interrupt_multichannel
671  * @handle:	Handle to context, written back by kernel
672  *
673  * Prior to sending or receiving isochronous I/O, a context must be created.
674  * The context records information about the transmit or receive configuration
675  * and typically maps to an underlying hardware resource.  A context is set up
676  * for either sending or receiving.  It is bound to a specific isochronous
677  * @channel.
678  *
679  * In case of multichannel reception, @header_size and @channel are ignored
680  * and the channels are selected by %FW_CDEV_IOC_SET_ISO_CHANNELS.
681  *
682  * For %FW_CDEV_ISO_CONTEXT_RECEIVE contexts, @header_size must be at least 4
683  * and must be a multiple of 4.  It is ignored in other context types.
684  *
685  * @speed is ignored in receive context types.
686  *
687  * If a context was successfully created, the kernel writes back a handle to the
688  * context, which must be passed in for subsequent operations on that context.
689  *
690  * Limitations:
691  * No more than one iso context can be created per fd.
692  * The total number of contexts that all userspace and kernelspace drivers can
693  * create on a card at a time is a hardware limit, typically 4 or 8 contexts per
694  * direction, and of them at most one multichannel receive context.
695  */
696 struct fw_cdev_create_iso_context {
697 	__u32 type;
698 	__u32 header_size;
699 	__u32 channel;
700 	__u32 speed;
701 	__u64 closure;
702 	__u32 handle;
703 };
704 
705 /**
706  * struct fw_cdev_set_iso_channels - Select channels in multichannel reception
707  * @channels:	Bitmask of channels to listen to
708  * @handle:	Handle of the mutichannel receive context
709  *
710  * @channels is the bitwise or of 1ULL << n for each channel n to listen to.
711  *
712  * The ioctl fails with errno %EBUSY if there is already another receive context
713  * on a channel in @channels.  In that case, the bitmask of all unoccupied
714  * channels is returned in @channels.
715  */
716 struct fw_cdev_set_iso_channels {
717 	__u64 channels;
718 	__u32 handle;
719 };
720 
721 #define FW_CDEV_ISO_PAYLOAD_LENGTH(v)	(v)
722 #define FW_CDEV_ISO_INTERRUPT		(1 << 16)
723 #define FW_CDEV_ISO_SKIP		(1 << 17)
724 #define FW_CDEV_ISO_SYNC		(1 << 17)
725 #define FW_CDEV_ISO_TAG(v)		((v) << 18)
726 #define FW_CDEV_ISO_SY(v)		((v) << 20)
727 #define FW_CDEV_ISO_HEADER_LENGTH(v)	((v) << 24)
728 
729 /**
730  * struct fw_cdev_iso_packet - Isochronous packet
731  * @control:	Contains the header length (8 uppermost bits),
732  *		the sy field (4 bits), the tag field (2 bits), a sync flag
733  *		or a skip flag (1 bit), an interrupt flag (1 bit), and the
734  *		payload length (16 lowermost bits)
735  * @header:	Header and payload in case of a transmit context.
736  *
737  * &struct fw_cdev_iso_packet is used to describe isochronous packet queues.
738  * Use the FW_CDEV_ISO_ macros to fill in @control.
739  * The @header array is empty in case of receive contexts.
740  *
741  * Context type %FW_CDEV_ISO_CONTEXT_TRANSMIT:
742  *
743  * @control.HEADER_LENGTH must be a multiple of 4.  It specifies the numbers of
744  * bytes in @header that will be prepended to the packet's payload.  These bytes
745  * are copied into the kernel and will not be accessed after the ioctl has
746  * returned.
747  *
748  * The @control.SY and TAG fields are copied to the iso packet header.  These
749  * fields are specified by IEEE 1394a and IEC 61883-1.
750  *
751  * The @control.SKIP flag specifies that no packet is to be sent in a frame.
752  * When using this, all other fields except @control.INTERRUPT must be zero.
753  *
754  * When a packet with the @control.INTERRUPT flag set has been completed, an
755  * &fw_cdev_event_iso_interrupt event will be sent.
756  *
757  * Context type %FW_CDEV_ISO_CONTEXT_RECEIVE:
758  *
759  * @control.HEADER_LENGTH must be a multiple of the context's header_size.
760  * If the HEADER_LENGTH is larger than the context's header_size, multiple
761  * packets are queued for this entry.
762  *
763  * The @control.SY and TAG fields are ignored.
764  *
765  * If the @control.SYNC flag is set, the context drops all packets until a
766  * packet with a sy field is received which matches &fw_cdev_start_iso.sync.
767  *
768  * @control.PAYLOAD_LENGTH defines how many payload bytes can be received for
769  * one packet (in addition to payload quadlets that have been defined as headers
770  * and are stripped and returned in the &fw_cdev_event_iso_interrupt structure).
771  * If more bytes are received, the additional bytes are dropped.  If less bytes
772  * are received, the remaining bytes in this part of the payload buffer will not
773  * be written to, not even by the next packet.  I.e., packets received in
774  * consecutive frames will not necessarily be consecutive in memory.  If an
775  * entry has queued multiple packets, the PAYLOAD_LENGTH is divided equally
776  * among them.
777  *
778  * When a packet with the @control.INTERRUPT flag set has been completed, an
779  * &fw_cdev_event_iso_interrupt event will be sent.  An entry that has queued
780  * multiple receive packets is completed when its last packet is completed.
781  *
782  * Context type %FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
783  *
784  * Here, &fw_cdev_iso_packet would be more aptly named _iso_buffer_chunk since
785  * it specifies a chunk of the mmap()'ed buffer, while the number and alignment
786  * of packets to be placed into the buffer chunk is not known beforehand.
787  *
788  * @control.PAYLOAD_LENGTH is the size of the buffer chunk and specifies room
789  * for header, payload, padding, and trailer bytes of one or more packets.
790  * It must be a multiple of 4.
791  *
792  * @control.HEADER_LENGTH, TAG and SY are ignored.  SYNC is treated as described
793  * for single-channel reception.
794  *
795  * When a buffer chunk with the @control.INTERRUPT flag set has been filled
796  * entirely, an &fw_cdev_event_iso_interrupt_mc event will be sent.
797  */
798 struct fw_cdev_iso_packet {
799 	__u32 control;
800 	__u32 header[0];
801 };
802 
803 /**
804  * struct fw_cdev_queue_iso - Queue isochronous packets for I/O
805  * @packets:	Userspace pointer to an array of &fw_cdev_iso_packet
806  * @data:	Pointer into mmap()'ed payload buffer
807  * @size:	Size of the @packets array, in bytes
808  * @handle:	Isochronous context handle
809  *
810  * Queue a number of isochronous packets for reception or transmission.
811  * This ioctl takes a pointer to an array of &fw_cdev_iso_packet structs,
812  * which describe how to transmit from or receive into a contiguous region
813  * of a mmap()'ed payload buffer.  As part of transmit packet descriptors,
814  * a series of headers can be supplied, which will be prepended to the
815  * payload during DMA.
816  *
817  * The kernel may or may not queue all packets, but will write back updated
818  * values of the @packets, @data and @size fields, so the ioctl can be
819  * resubmitted easily.
820  *
821  * In case of a multichannel receive context, @data must be quadlet-aligned
822  * relative to the buffer start.
823  */
824 struct fw_cdev_queue_iso {
825 	__u64 packets;
826 	__u64 data;
827 	__u32 size;
828 	__u32 handle;
829 };
830 
831 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG0		 1
832 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG1		 2
833 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG2		 4
834 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG3		 8
835 #define FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS	15
836 
837 /**
838  * struct fw_cdev_start_iso - Start an isochronous transmission or reception
839  * @cycle:	Cycle in which to start I/O.  If @cycle is greater than or
840  *		equal to 0, the I/O will start on that cycle.
841  * @sync:	Determines the value to wait for for receive packets that have
842  *		the %FW_CDEV_ISO_SYNC bit set
843  * @tags:	Tag filter bit mask.  Only valid for isochronous reception.
844  *		Determines the tag values for which packets will be accepted.
845  *		Use FW_CDEV_ISO_CONTEXT_MATCH_ macros to set @tags.
846  * @handle:	Isochronous context handle within which to transmit or receive
847  */
848 struct fw_cdev_start_iso {
849 	__s32 cycle;
850 	__u32 sync;
851 	__u32 tags;
852 	__u32 handle;
853 };
854 
855 /**
856  * struct fw_cdev_stop_iso - Stop an isochronous transmission or reception
857  * @handle:	Handle of isochronous context to stop
858  */
859 struct fw_cdev_stop_iso {
860 	__u32 handle;
861 };
862 
863 /**
864  * struct fw_cdev_flush_iso - flush completed iso packets
865  * @handle:	handle of isochronous context to flush
866  *
867  * For %FW_CDEV_ISO_CONTEXT_TRANSMIT or %FW_CDEV_ISO_CONTEXT_RECEIVE contexts,
868  * report any completed packets.
869  *
870  * For %FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL contexts, report the current
871  * offset in the receive buffer, if it has changed; this is typically in the
872  * middle of some buffer chunk.
873  *
874  * Any %FW_CDEV_EVENT_ISO_INTERRUPT or %FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL
875  * events generated by this ioctl are sent synchronously, i.e., are available
876  * for reading from the file descriptor when this ioctl returns.
877  */
878 struct fw_cdev_flush_iso {
879 	__u32 handle;
880 };
881 
882 /**
883  * struct fw_cdev_get_cycle_timer - read cycle timer register
884  * @local_time:   system time, in microseconds since the Epoch
885  * @cycle_timer:  Cycle Time register contents
886  *
887  * Same as %FW_CDEV_IOC_GET_CYCLE_TIMER2, but fixed to use %CLOCK_REALTIME
888  * and only with microseconds resolution.
889  *
890  * In version 1 and 2 of the ABI, this ioctl returned unreliable (non-
891  * monotonic) @cycle_timer values on certain controllers.
892  */
893 struct fw_cdev_get_cycle_timer {
894 	__u64 local_time;
895 	__u32 cycle_timer;
896 };
897 
898 /**
899  * struct fw_cdev_get_cycle_timer2 - read cycle timer register
900  * @tv_sec:       system time, seconds
901  * @tv_nsec:      system time, sub-seconds part in nanoseconds
902  * @clk_id:       input parameter, clock from which to get the system time
903  * @cycle_timer:  Cycle Time register contents
904  *
905  * The %FW_CDEV_IOC_GET_CYCLE_TIMER2 ioctl reads the isochronous cycle timer
906  * and also the system clock.  This allows to correlate reception time of
907  * isochronous packets with system time.
908  *
909  * @clk_id lets you choose a clock like with POSIX' clock_gettime function.
910  * Supported @clk_id values are POSIX' %CLOCK_REALTIME and %CLOCK_MONOTONIC
911  * and Linux' %CLOCK_MONOTONIC_RAW.
912  *
913  * @cycle_timer consists of 7 bits cycleSeconds, 13 bits cycleCount, and
914  * 12 bits cycleOffset, in host byte order.  Cf. the Cycle Time register
915  * per IEEE 1394 or Isochronous Cycle Timer register per OHCI-1394.
916  */
917 struct fw_cdev_get_cycle_timer2 {
918 	__s64 tv_sec;
919 	__s32 tv_nsec;
920 	__s32 clk_id;
921 	__u32 cycle_timer;
922 };
923 
924 /**
925  * struct fw_cdev_allocate_iso_resource - (De)allocate a channel or bandwidth
926  * @closure:	Passed back to userspace in corresponding iso resource events
927  * @channels:	Isochronous channels of which one is to be (de)allocated
928  * @bandwidth:	Isochronous bandwidth units to be (de)allocated
929  * @handle:	Handle to the allocation, written by the kernel (only valid in
930  *		case of %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctls)
931  *
932  * The %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctl initiates allocation of an
933  * isochronous channel and/or of isochronous bandwidth at the isochronous
934  * resource manager (IRM).  Only one of the channels specified in @channels is
935  * allocated.  An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED is sent after
936  * communication with the IRM, indicating success or failure in the event data.
937  * The kernel will automatically reallocate the resources after bus resets.
938  * Should a reallocation fail, an %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event
939  * will be sent.  The kernel will also automatically deallocate the resources
940  * when the file descriptor is closed.
941  *
942  * The %FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE ioctl can be used to initiate
943  * deallocation of resources which were allocated as described above.
944  * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event concludes this operation.
945  *
946  * The %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE ioctl is a variant of allocation
947  * without automatic re- or deallocation.
948  * An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event concludes this operation,
949  * indicating success or failure in its data.
950  *
951  * The %FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE ioctl works like
952  * %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE except that resources are freed
953  * instead of allocated.
954  * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event concludes this operation.
955  *
956  * To summarize, %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE allocates iso resources
957  * for the lifetime of the fd or @handle.
958  * In contrast, %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE allocates iso resources
959  * for the duration of a bus generation.
960  *
961  * @channels is a host-endian bitfield with the least significant bit
962  * representing channel 0 and the most significant bit representing channel 63:
963  * 1ULL << c for each channel c that is a candidate for (de)allocation.
964  *
965  * @bandwidth is expressed in bandwidth allocation units, i.e. the time to send
966  * one quadlet of data (payload or header data) at speed S1600.
967  */
968 struct fw_cdev_allocate_iso_resource {
969 	__u64 closure;
970 	__u64 channels;
971 	__u32 bandwidth;
972 	__u32 handle;
973 };
974 
975 /**
976  * struct fw_cdev_send_stream_packet - send an asynchronous stream packet
977  * @length:	Length of outgoing payload, in bytes
978  * @tag:	Data format tag
979  * @channel:	Isochronous channel to transmit to
980  * @sy:		Synchronization code
981  * @closure:	Passed back to userspace in the response event
982  * @data:	Userspace pointer to payload
983  * @generation:	The bus generation where packet is valid
984  * @speed:	Speed to transmit at
985  *
986  * The %FW_CDEV_IOC_SEND_STREAM_PACKET ioctl sends an asynchronous stream packet
987  * to every device which is listening to the specified channel.  The kernel
988  * writes an &fw_cdev_event_response event which indicates success or failure of
989  * the transmission.
990  */
991 struct fw_cdev_send_stream_packet {
992 	__u32 length;
993 	__u32 tag;
994 	__u32 channel;
995 	__u32 sy;
996 	__u64 closure;
997 	__u64 data;
998 	__u32 generation;
999 	__u32 speed;
1000 };
1001 
1002 /**
1003  * struct fw_cdev_send_phy_packet - send a PHY packet
1004  * @closure:	Passed back to userspace in the PHY-packet-sent event
1005  * @data:	First and second quadlet of the PHY packet
1006  * @generation:	The bus generation where packet is valid
1007  *
1008  * The %FW_CDEV_IOC_SEND_PHY_PACKET ioctl sends a PHY packet to all nodes
1009  * on the same card as this device.  After transmission, an
1010  * %FW_CDEV_EVENT_PHY_PACKET_SENT event is generated.
1011  *
1012  * The payload @data[] shall be specified in host byte order.  Usually,
1013  * @data[1] needs to be the bitwise inverse of @data[0].  VersaPHY packets
1014  * are an exception to this rule.
1015  *
1016  * The ioctl is only permitted on device files which represent a local node.
1017  */
1018 struct fw_cdev_send_phy_packet {
1019 	__u64 closure;
1020 	__u32 data[2];
1021 	__u32 generation;
1022 };
1023 
1024 /**
1025  * struct fw_cdev_receive_phy_packets - start reception of PHY packets
1026  * @closure: Passed back to userspace in phy packet events
1027  *
1028  * This ioctl activates issuing of %FW_CDEV_EVENT_PHY_PACKET_RECEIVED due to
1029  * incoming PHY packets from any node on the same bus as the device.
1030  *
1031  * The ioctl is only permitted on device files which represent a local node.
1032  */
1033 struct fw_cdev_receive_phy_packets {
1034 	__u64 closure;
1035 };
1036 
1037 #define FW_CDEV_VERSION 3 /* Meaningless legacy macro; don't use it. */
1038 
1039 #endif /* _LINUX_FIREWIRE_CDEV_H */
1040