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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 | #define FW_CDEV_EVENT_BUS_RESET 0x00 |
34 | #define FW_CDEV_EVENT_RESPONSE 0x01 |
35 | #define FW_CDEV_EVENT_REQUEST 0x02 |
36 | #define FW_CDEV_EVENT_ISO_INTERRUPT 0x03 |
37 | #define FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED 0x04 |
38 | #define FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED 0x05 |
39 | |
40 | /** |
41 | * struct fw_cdev_event_common - Common part of all fw_cdev_event_ types |
42 | * @closure: For arbitrary use by userspace |
43 | * @type: Discriminates the fw_cdev_event_ types |
44 | * |
45 | * This struct may be used to access generic members of all fw_cdev_event_ |
46 | * types regardless of the specific type. |
47 | * |
48 | * Data passed in the @closure field for a request will be returned in the |
49 | * corresponding event. It is big enough to hold a pointer on all platforms. |
50 | * The ioctl used to set @closure depends on the @type of event. |
51 | */ |
52 | struct fw_cdev_event_common { |
53 | __u64 closure; |
54 | __u32 type; |
55 | }; |
56 | |
57 | /** |
58 | * struct fw_cdev_event_bus_reset - Sent when a bus reset occurred |
59 | * @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_GET_INFO ioctl |
60 | * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_BUS_RESET |
61 | * @node_id: New node ID of this node |
62 | * @local_node_id: Node ID of the local node, i.e. of the controller |
63 | * @bm_node_id: Node ID of the bus manager |
64 | * @irm_node_id: Node ID of the iso resource manager |
65 | * @root_node_id: Node ID of the root node |
66 | * @generation: New bus generation |
67 | * |
68 | * This event is sent when the bus the device belongs to goes through a bus |
69 | * reset. It provides information about the new bus configuration, such as |
70 | * new node ID for this device, new root ID, and others. |
71 | */ |
72 | struct fw_cdev_event_bus_reset { |
73 | __u64 closure; |
74 | __u32 type; |
75 | __u32 node_id; |
76 | __u32 local_node_id; |
77 | __u32 bm_node_id; |
78 | __u32 irm_node_id; |
79 | __u32 root_node_id; |
80 | __u32 generation; |
81 | }; |
82 | |
83 | /** |
84 | * struct fw_cdev_event_response - Sent when a response packet was received |
85 | * @closure: See &fw_cdev_event_common; |
86 | * set by %FW_CDEV_IOC_SEND_REQUEST ioctl |
87 | * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_RESPONSE |
88 | * @rcode: Response code returned by the remote node |
89 | * @length: Data length, i.e. the response's payload size in bytes |
90 | * @data: Payload data, if any |
91 | * |
92 | * This event is sent when the stack receives a response to an outgoing request |
93 | * sent by %FW_CDEV_IOC_SEND_REQUEST ioctl. The payload data for responses |
94 | * carrying data (read and lock responses) follows immediately and can be |
95 | * accessed through the @data field. |
96 | */ |
97 | struct fw_cdev_event_response { |
98 | __u64 closure; |
99 | __u32 type; |
100 | __u32 rcode; |
101 | __u32 length; |
102 | __u32 data[0]; |
103 | }; |
104 | |
105 | /** |
106 | * struct fw_cdev_event_request - Sent on incoming request to an address region |
107 | * @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_ALLOCATE ioctl |
108 | * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_REQUEST |
109 | * @tcode: Transaction code of the incoming request |
110 | * @offset: The offset into the 48-bit per-node address space |
111 | * @handle: Reference to the kernel-side pending request |
112 | * @length: Data length, i.e. the request's payload size in bytes |
113 | * @data: Incoming data, if any |
114 | * |
115 | * This event is sent when the stack receives an incoming request to an address |
116 | * region registered using the %FW_CDEV_IOC_ALLOCATE ioctl. The request is |
117 | * guaranteed to be completely contained in the specified region. Userspace is |
118 | * responsible for sending the response by %FW_CDEV_IOC_SEND_RESPONSE ioctl, |
119 | * using the same @handle. |
120 | * |
121 | * The payload data for requests carrying data (write and lock requests) |
122 | * follows immediately and can be accessed through the @data field. |
123 | */ |
124 | struct fw_cdev_event_request { |
125 | __u64 closure; |
126 | __u32 type; |
127 | __u32 tcode; |
128 | __u64 offset; |
129 | __u32 handle; |
130 | __u32 length; |
131 | __u32 data[0]; |
132 | }; |
133 | |
134 | /** |
135 | * struct fw_cdev_event_iso_interrupt - Sent when an iso packet was completed |
136 | * @closure: See &fw_cdev_event_common; |
137 | * set by %FW_CDEV_CREATE_ISO_CONTEXT ioctl |
138 | * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_ISO_INTERRUPT |
139 | * @cycle: Cycle counter of the interrupt packet |
140 | * @header_length: Total length of following headers, in bytes |
141 | * @header: Stripped headers, if any |
142 | * |
143 | * This event is sent when the controller has completed an &fw_cdev_iso_packet |
144 | * with the %FW_CDEV_ISO_INTERRUPT bit set. In the receive case, the headers |
145 | * stripped of all packets up until and including the interrupt packet are |
146 | * returned in the @header field. The amount of header data per packet is as |
147 | * specified at iso context creation by &fw_cdev_create_iso_context.header_size. |
148 | * |
149 | * In version 1 of this ABI, header data consisted of the 1394 isochronous |
150 | * packet header, followed by quadlets from the packet payload if |
151 | * &fw_cdev_create_iso_context.header_size > 4. |
152 | * |
153 | * In version 2 of this ABI, header data consist of the 1394 isochronous |
154 | * packet header, followed by a timestamp quadlet if |
155 | * &fw_cdev_create_iso_context.header_size > 4, followed by quadlets from the |
156 | * packet payload if &fw_cdev_create_iso_context.header_size > 8. |
157 | * |
158 | * Behaviour of ver. 1 of this ABI is no longer available since ABI ver. 2. |
159 | * |
160 | * Format of 1394 iso packet header: 16 bits len, 2 bits tag, 6 bits channel, |
161 | * 4 bits tcode, 4 bits sy, in big endian byte order. Format of timestamp: |
162 | * 16 bits invalid, 3 bits cycleSeconds, 13 bits cycleCount, in big endian byte |
163 | * order. |
164 | */ |
165 | struct fw_cdev_event_iso_interrupt { |
166 | __u64 closure; |
167 | __u32 type; |
168 | __u32 cycle; |
169 | __u32 header_length; |
170 | __u32 header[0]; |
171 | }; |
172 | |
173 | /** |
174 | * struct fw_cdev_event_iso_resource - Iso resources were allocated or freed |
175 | * @closure: See &fw_cdev_event_common; |
176 | * set by %FW_CDEV_IOC_(DE)ALLOCATE_ISO_RESOURCE(_ONCE) ioctl |
177 | * @type: %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or |
178 | * %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED |
179 | * @handle: Reference by which an allocated resource can be deallocated |
180 | * @channel: Isochronous channel which was (de)allocated, if any |
181 | * @bandwidth: Bandwidth allocation units which were (de)allocated, if any |
182 | * |
183 | * An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event is sent after an isochronous |
184 | * resource was allocated at the IRM. The client has to check @channel and |
185 | * @bandwidth for whether the allocation actually succeeded. |
186 | * |
187 | * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event is sent after an isochronous |
188 | * resource was deallocated at the IRM. It is also sent when automatic |
189 | * reallocation after a bus reset failed. |
190 | * |
191 | * @channel is <0 if no channel was (de)allocated or if reallocation failed. |
192 | * @bandwidth is 0 if no bandwidth was (de)allocated or if reallocation failed. |
193 | */ |
194 | struct fw_cdev_event_iso_resource { |
195 | __u64 closure; |
196 | __u32 type; |
197 | __u32 handle; |
198 | __s32 channel; |
199 | __s32 bandwidth; |
200 | }; |
201 | |
202 | /** |
203 | * union fw_cdev_event - Convenience union of fw_cdev_event_ types |
204 | * @common: Valid for all types |
205 | * @bus_reset: Valid if @common.type == %FW_CDEV_EVENT_BUS_RESET |
206 | * @response: Valid if @common.type == %FW_CDEV_EVENT_RESPONSE |
207 | * @request: Valid if @common.type == %FW_CDEV_EVENT_REQUEST |
208 | * @iso_interrupt: Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT |
209 | * @iso_resource: Valid if @common.type == |
210 | * %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or |
211 | * %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED |
212 | * |
213 | * Convenience union for userspace use. Events could be read(2) into an |
214 | * appropriately aligned char buffer and then cast to this union for further |
215 | * processing. Note that for a request, response or iso_interrupt event, |
216 | * the data[] or header[] may make the size of the full event larger than |
217 | * sizeof(union fw_cdev_event). Also note that if you attempt to read(2) |
218 | * an event into a buffer that is not large enough for it, the data that does |
219 | * not fit will be discarded so that the next read(2) will return a new event. |
220 | */ |
221 | union fw_cdev_event { |
222 | struct fw_cdev_event_common common; |
223 | struct fw_cdev_event_bus_reset bus_reset; |
224 | struct fw_cdev_event_response response; |
225 | struct fw_cdev_event_request request; |
226 | struct fw_cdev_event_iso_interrupt iso_interrupt; |
227 | struct fw_cdev_event_iso_resource iso_resource; |
228 | }; |
229 | |
230 | /* available since kernel version 2.6.22 */ |
231 | #define FW_CDEV_IOC_GET_INFO _IOWR('#', 0x00, struct fw_cdev_get_info) |
232 | #define FW_CDEV_IOC_SEND_REQUEST _IOW('#', 0x01, struct fw_cdev_send_request) |
233 | #define FW_CDEV_IOC_ALLOCATE _IOWR('#', 0x02, struct fw_cdev_allocate) |
234 | #define FW_CDEV_IOC_DEALLOCATE _IOW('#', 0x03, struct fw_cdev_deallocate) |
235 | #define FW_CDEV_IOC_SEND_RESPONSE _IOW('#', 0x04, struct fw_cdev_send_response) |
236 | #define FW_CDEV_IOC_INITIATE_BUS_RESET _IOW('#', 0x05, struct fw_cdev_initiate_bus_reset) |
237 | #define FW_CDEV_IOC_ADD_DESCRIPTOR _IOWR('#', 0x06, struct fw_cdev_add_descriptor) |
238 | #define FW_CDEV_IOC_REMOVE_DESCRIPTOR _IOW('#', 0x07, struct fw_cdev_remove_descriptor) |
239 | #define FW_CDEV_IOC_CREATE_ISO_CONTEXT _IOWR('#', 0x08, struct fw_cdev_create_iso_context) |
240 | #define FW_CDEV_IOC_QUEUE_ISO _IOWR('#', 0x09, struct fw_cdev_queue_iso) |
241 | #define FW_CDEV_IOC_START_ISO _IOW('#', 0x0a, struct fw_cdev_start_iso) |
242 | #define FW_CDEV_IOC_STOP_ISO _IOW('#', 0x0b, struct fw_cdev_stop_iso) |
243 | |
244 | /* available since kernel version 2.6.24 */ |
245 | #define FW_CDEV_IOC_GET_CYCLE_TIMER _IOR('#', 0x0c, struct fw_cdev_get_cycle_timer) |
246 | |
247 | /* available since kernel version 2.6.30 */ |
248 | #define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE _IOWR('#', 0x0d, struct fw_cdev_allocate_iso_resource) |
249 | #define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE _IOW('#', 0x0e, struct fw_cdev_deallocate) |
250 | #define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x0f, struct fw_cdev_allocate_iso_resource) |
251 | #define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x10, struct fw_cdev_allocate_iso_resource) |
252 | #define FW_CDEV_IOC_GET_SPEED _IO('#', 0x11) /* returns speed code */ |
253 | #define FW_CDEV_IOC_SEND_BROADCAST_REQUEST _IOW('#', 0x12, struct fw_cdev_send_request) |
254 | #define FW_CDEV_IOC_SEND_STREAM_PACKET _IOW('#', 0x13, struct fw_cdev_send_stream_packet) |
255 | |
256 | /* available since kernel version 2.6.34 */ |
257 | #define FW_CDEV_IOC_GET_CYCLE_TIMER2 _IOWR('#', 0x14, struct fw_cdev_get_cycle_timer2) |
258 | |
259 | /* |
260 | * FW_CDEV_VERSION History |
261 | * 1 (2.6.22) - initial version |
262 | * 2 (2.6.30) - changed &fw_cdev_event_iso_interrupt.header if |
263 | * &fw_cdev_create_iso_context.header_size is 8 or more |
264 | * (2.6.32) - added time stamp to xmit &fw_cdev_event_iso_interrupt |
265 | * (2.6.33) - IR has always packet-per-buffer semantics now, not one of |
266 | * dual-buffer or packet-per-buffer depending on hardware |
267 | * 3 (2.6.34) - made &fw_cdev_get_cycle_timer reliable |
268 | */ |
269 | #define FW_CDEV_VERSION 3 |
270 | |
271 | /** |
272 | * struct fw_cdev_get_info - General purpose information ioctl |
273 | * @version: The version field is just a running serial number. |
274 | * We never break backwards compatibility, but may add more |
275 | * structs and ioctls in later revisions. |
276 | * @rom_length: If @rom is non-zero, at most rom_length bytes of configuration |
277 | * ROM will be copied into that user space address. In either |
278 | * case, @rom_length is updated with the actual length of the |
279 | * configuration ROM. |
280 | * @rom: If non-zero, address of a buffer to be filled by a copy of the |
281 | * device's configuration ROM |
282 | * @bus_reset: If non-zero, address of a buffer to be filled by a |
283 | * &struct fw_cdev_event_bus_reset with the current state |
284 | * of the bus. This does not cause a bus reset to happen. |
285 | * @bus_reset_closure: Value of &closure in this and subsequent bus reset events |
286 | * @card: The index of the card this device belongs to |
287 | */ |
288 | struct fw_cdev_get_info { |
289 | __u32 version; |
290 | __u32 rom_length; |
291 | __u64 rom; |
292 | __u64 bus_reset; |
293 | __u64 bus_reset_closure; |
294 | __u32 card; |
295 | }; |
296 | |
297 | /** |
298 | * struct fw_cdev_send_request - Send an asynchronous request packet |
299 | * @tcode: Transaction code of the request |
300 | * @length: Length of outgoing payload, in bytes |
301 | * @offset: 48-bit offset at destination node |
302 | * @closure: Passed back to userspace in the response event |
303 | * @data: Userspace pointer to payload |
304 | * @generation: The bus generation where packet is valid |
305 | * |
306 | * Send a request to the device. This ioctl implements all outgoing requests. |
307 | * Both quadlet and block request specify the payload as a pointer to the data |
308 | * in the @data field. Once the transaction completes, the kernel writes an |
309 | * &fw_cdev_event_response event back. The @closure field is passed back to |
310 | * user space in the response event. |
311 | */ |
312 | struct fw_cdev_send_request { |
313 | __u32 tcode; |
314 | __u32 length; |
315 | __u64 offset; |
316 | __u64 closure; |
317 | __u64 data; |
318 | __u32 generation; |
319 | }; |
320 | |
321 | /** |
322 | * struct fw_cdev_send_response - Send an asynchronous response packet |
323 | * @rcode: Response code as determined by the userspace handler |
324 | * @length: Length of outgoing payload, in bytes |
325 | * @data: Userspace pointer to payload |
326 | * @handle: The handle from the &fw_cdev_event_request |
327 | * |
328 | * Send a response to an incoming request. By setting up an address range using |
329 | * the %FW_CDEV_IOC_ALLOCATE ioctl, userspace can listen for incoming requests. An |
330 | * incoming request will generate an %FW_CDEV_EVENT_REQUEST, and userspace must |
331 | * send a reply using this ioctl. The event has a handle to the kernel-side |
332 | * pending transaction, which should be used with this ioctl. |
333 | */ |
334 | struct fw_cdev_send_response { |
335 | __u32 rcode; |
336 | __u32 length; |
337 | __u64 data; |
338 | __u32 handle; |
339 | }; |
340 | |
341 | /** |
342 | * struct fw_cdev_allocate - Allocate a CSR address range |
343 | * @offset: Start offset of the address range |
344 | * @closure: To be passed back to userspace in request events |
345 | * @length: Length of the address range, in bytes |
346 | * @handle: Handle to the allocation, written by the kernel |
347 | * |
348 | * Allocate an address range in the 48-bit address space on the local node |
349 | * (the controller). This allows userspace to listen for requests with an |
350 | * offset within that address range. When the kernel receives a request |
351 | * within the range, an &fw_cdev_event_request event will be written back. |
352 | * The @closure field is passed back to userspace in the response event. |
353 | * The @handle field is an out parameter, returning a handle to the allocated |
354 | * range to be used for later deallocation of the range. |
355 | * |
356 | * The address range is allocated on all local nodes. The address allocation |
357 | * is exclusive except for the FCP command and response registers. |
358 | */ |
359 | struct fw_cdev_allocate { |
360 | __u64 offset; |
361 | __u64 closure; |
362 | __u32 length; |
363 | __u32 handle; |
364 | }; |
365 | |
366 | /** |
367 | * struct fw_cdev_deallocate - Free a CSR address range or isochronous resource |
368 | * @handle: Handle to the address range or iso resource, as returned by the |
369 | * kernel when the range or resource was allocated |
370 | */ |
371 | struct fw_cdev_deallocate { |
372 | __u32 handle; |
373 | }; |
374 | |
375 | #define FW_CDEV_LONG_RESET 0 |
376 | #define FW_CDEV_SHORT_RESET 1 |
377 | |
378 | /** |
379 | * struct fw_cdev_initiate_bus_reset - Initiate a bus reset |
380 | * @type: %FW_CDEV_SHORT_RESET or %FW_CDEV_LONG_RESET |
381 | * |
382 | * Initiate a bus reset for the bus this device is on. The bus reset can be |
383 | * either the original (long) bus reset or the arbitrated (short) bus reset |
384 | * introduced in 1394a-2000. |
385 | */ |
386 | struct fw_cdev_initiate_bus_reset { |
387 | __u32 type; /* FW_CDEV_SHORT_RESET or FW_CDEV_LONG_RESET */ |
388 | }; |
389 | |
390 | /** |
391 | * struct fw_cdev_add_descriptor - Add contents to the local node's config ROM |
392 | * @immediate: If non-zero, immediate key to insert before pointer |
393 | * @key: Upper 8 bits of root directory pointer |
394 | * @data: Userspace pointer to contents of descriptor block |
395 | * @length: Length of descriptor block data, in quadlets |
396 | * @handle: Handle to the descriptor, written by the kernel |
397 | * |
398 | * Add a descriptor block and optionally a preceding immediate key to the local |
399 | * node's configuration ROM. |
400 | * |
401 | * The @key field specifies the upper 8 bits of the descriptor root directory |
402 | * pointer and the @data and @length fields specify the contents. The @key |
403 | * should be of the form 0xXX000000. The offset part of the root directory entry |
404 | * will be filled in by the kernel. |
405 | * |
406 | * If not 0, the @immediate field specifies an immediate key which will be |
407 | * inserted before the root directory pointer. |
408 | * |
409 | * @immediate, @key, and @data array elements are CPU-endian quadlets. |
410 | * |
411 | * If successful, the kernel adds the descriptor and writes back a handle to the |
412 | * kernel-side object to be used for later removal of the descriptor block and |
413 | * immediate key. |
414 | * |
415 | * This ioctl affects the configuration ROMs of all local nodes. |
416 | * The ioctl only succeeds on device files which represent a local node. |
417 | */ |
418 | struct fw_cdev_add_descriptor { |
419 | __u32 immediate; |
420 | __u32 key; |
421 | __u64 data; |
422 | __u32 length; |
423 | __u32 handle; |
424 | }; |
425 | |
426 | /** |
427 | * struct fw_cdev_remove_descriptor - Remove contents from the configuration ROM |
428 | * @handle: Handle to the descriptor, as returned by the kernel when the |
429 | * descriptor was added |
430 | * |
431 | * Remove a descriptor block and accompanying immediate key from the local |
432 | * nodes' configuration ROMs. |
433 | */ |
434 | struct fw_cdev_remove_descriptor { |
435 | __u32 handle; |
436 | }; |
437 | |
438 | #define FW_CDEV_ISO_CONTEXT_TRANSMIT 0 |
439 | #define FW_CDEV_ISO_CONTEXT_RECEIVE 1 |
440 | |
441 | /** |
442 | * struct fw_cdev_create_iso_context - Create a context for isochronous IO |
443 | * @type: %FW_CDEV_ISO_CONTEXT_TRANSMIT or %FW_CDEV_ISO_CONTEXT_RECEIVE |
444 | * @header_size: Header size to strip for receive contexts |
445 | * @channel: Channel to bind to |
446 | * @speed: Speed for transmit contexts |
447 | * @closure: To be returned in &fw_cdev_event_iso_interrupt |
448 | * @handle: Handle to context, written back by kernel |
449 | * |
450 | * Prior to sending or receiving isochronous I/O, a context must be created. |
451 | * The context records information about the transmit or receive configuration |
452 | * and typically maps to an underlying hardware resource. A context is set up |
453 | * for either sending or receiving. It is bound to a specific isochronous |
454 | * channel. |
455 | * |
456 | * If a context was successfully created, the kernel writes back a handle to the |
457 | * context, which must be passed in for subsequent operations on that context. |
458 | * |
459 | * For receive contexts, @header_size must be at least 4 and must be a multiple |
460 | * of 4. |
461 | * |
462 | * Note that the effect of a @header_size > 4 depends on |
463 | * &fw_cdev_get_info.version, as documented at &fw_cdev_event_iso_interrupt. |
464 | */ |
465 | struct fw_cdev_create_iso_context { |
466 | __u32 type; |
467 | __u32 header_size; |
468 | __u32 channel; |
469 | __u32 speed; |
470 | __u64 closure; |
471 | __u32 handle; |
472 | }; |
473 | |
474 | #define FW_CDEV_ISO_PAYLOAD_LENGTH(v) (v) |
475 | #define FW_CDEV_ISO_INTERRUPT (1 << 16) |
476 | #define FW_CDEV_ISO_SKIP (1 << 17) |
477 | #define FW_CDEV_ISO_SYNC (1 << 17) |
478 | #define FW_CDEV_ISO_TAG(v) ((v) << 18) |
479 | #define FW_CDEV_ISO_SY(v) ((v) << 20) |
480 | #define FW_CDEV_ISO_HEADER_LENGTH(v) ((v) << 24) |
481 | |
482 | /** |
483 | * struct fw_cdev_iso_packet - Isochronous packet |
484 | * @control: Contains the header length (8 uppermost bits), the sy field |
485 | * (4 bits), the tag field (2 bits), a sync flag (1 bit), |
486 | * a skip flag (1 bit), an interrupt flag (1 bit), and the |
487 | * payload length (16 lowermost bits) |
488 | * @header: Header and payload |
489 | * |
490 | * &struct fw_cdev_iso_packet is used to describe isochronous packet queues. |
491 | * |
492 | * Use the FW_CDEV_ISO_ macros to fill in @control. |
493 | * |
494 | * For transmit packets, the header length must be a multiple of 4 and specifies |
495 | * the numbers of bytes in @header that will be prepended to the packet's |
496 | * payload; these bytes are copied into the kernel and will not be accessed |
497 | * after the ioctl has returned. The sy and tag fields are copied to the iso |
498 | * packet header (these fields are specified by IEEE 1394a and IEC 61883-1). |
499 | * The skip flag specifies that no packet is to be sent in a frame; when using |
500 | * this, all other fields except the interrupt flag must be zero. |
501 | * |
502 | * For receive packets, the header length must be a multiple of the context's |
503 | * header size; if the header length is larger than the context's header size, |
504 | * multiple packets are queued for this entry. The sy and tag fields are |
505 | * ignored. If the sync flag is set, the context drops all packets until |
506 | * a packet with a matching sy field is received (the sync value to wait for is |
507 | * specified in the &fw_cdev_start_iso structure). The payload length defines |
508 | * how many payload bytes can be received for one packet (in addition to payload |
509 | * quadlets that have been defined as headers and are stripped and returned in |
510 | * the &fw_cdev_event_iso_interrupt structure). If more bytes are received, the |
511 | * additional bytes are dropped. If less bytes are received, the remaining |
512 | * bytes in this part of the payload buffer will not be written to, not even by |
513 | * the next packet, i.e., packets received in consecutive frames will not |
514 | * necessarily be consecutive in memory. If an entry has queued multiple |
515 | * packets, the payload length is divided equally among them. |
516 | * |
517 | * When a packet with the interrupt flag set has been completed, the |
518 | * &fw_cdev_event_iso_interrupt event will be sent. An entry that has queued |
519 | * multiple receive packets is completed when its last packet is completed. |
520 | */ |
521 | struct fw_cdev_iso_packet { |
522 | __u32 control; |
523 | __u32 header[0]; |
524 | }; |
525 | |
526 | /** |
527 | * struct fw_cdev_queue_iso - Queue isochronous packets for I/O |
528 | * @packets: Userspace pointer to packet data |
529 | * @data: Pointer into mmap()'ed payload buffer |
530 | * @size: Size of packet data in bytes |
531 | * @handle: Isochronous context handle |
532 | * |
533 | * Queue a number of isochronous packets for reception or transmission. |
534 | * This ioctl takes a pointer to an array of &fw_cdev_iso_packet structs, |
535 | * which describe how to transmit from or receive into a contiguous region |
536 | * of a mmap()'ed payload buffer. As part of transmit packet descriptors, |
537 | * a series of headers can be supplied, which will be prepended to the |
538 | * payload during DMA. |
539 | * |
540 | * The kernel may or may not queue all packets, but will write back updated |
541 | * values of the @packets, @data and @size fields, so the ioctl can be |
542 | * resubmitted easily. |
543 | */ |
544 | struct fw_cdev_queue_iso { |
545 | __u64 packets; |
546 | __u64 data; |
547 | __u32 size; |
548 | __u32 handle; |
549 | }; |
550 | |
551 | #define FW_CDEV_ISO_CONTEXT_MATCH_TAG0 1 |
552 | #define FW_CDEV_ISO_CONTEXT_MATCH_TAG1 2 |
553 | #define FW_CDEV_ISO_CONTEXT_MATCH_TAG2 4 |
554 | #define FW_CDEV_ISO_CONTEXT_MATCH_TAG3 8 |
555 | #define FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS 15 |
556 | |
557 | /** |
558 | * struct fw_cdev_start_iso - Start an isochronous transmission or reception |
559 | * @cycle: Cycle in which to start I/O. If @cycle is greater than or |
560 | * equal to 0, the I/O will start on that cycle. |
561 | * @sync: Determines the value to wait for for receive packets that have |
562 | * the %FW_CDEV_ISO_SYNC bit set |
563 | * @tags: Tag filter bit mask. Only valid for isochronous reception. |
564 | * Determines the tag values for which packets will be accepted. |
565 | * Use FW_CDEV_ISO_CONTEXT_MATCH_ macros to set @tags. |
566 | * @handle: Isochronous context handle within which to transmit or receive |
567 | */ |
568 | struct fw_cdev_start_iso { |
569 | __s32 cycle; |
570 | __u32 sync; |
571 | __u32 tags; |
572 | __u32 handle; |
573 | }; |
574 | |
575 | /** |
576 | * struct fw_cdev_stop_iso - Stop an isochronous transmission or reception |
577 | * @handle: Handle of isochronous context to stop |
578 | */ |
579 | struct fw_cdev_stop_iso { |
580 | __u32 handle; |
581 | }; |
582 | |
583 | /** |
584 | * struct fw_cdev_get_cycle_timer - read cycle timer register |
585 | * @local_time: system time, in microseconds since the Epoch |
586 | * @cycle_timer: Cycle Time register contents |
587 | * |
588 | * The %FW_CDEV_IOC_GET_CYCLE_TIMER ioctl reads the isochronous cycle timer |
589 | * and also the system clock (%CLOCK_REALTIME). This allows to express the |
590 | * receive time of an isochronous packet as a system time. |
591 | * |
592 | * @cycle_timer consists of 7 bits cycleSeconds, 13 bits cycleCount, and |
593 | * 12 bits cycleOffset, in host byte order. Cf. the Cycle Time register |
594 | * per IEEE 1394 or Isochronous Cycle Timer register per OHCI-1394. |
595 | * |
596 | * In version 1 and 2 of the ABI, this ioctl returned unreliable (non- |
597 | * monotonic) @cycle_timer values on certain controllers. |
598 | */ |
599 | struct fw_cdev_get_cycle_timer { |
600 | __u64 local_time; |
601 | __u32 cycle_timer; |
602 | }; |
603 | |
604 | /** |
605 | * struct fw_cdev_get_cycle_timer2 - read cycle timer register |
606 | * @tv_sec: system time, seconds |
607 | * @tv_nsec: system time, sub-seconds part in nanoseconds |
608 | * @clk_id: input parameter, clock from which to get the system time |
609 | * @cycle_timer: Cycle Time register contents |
610 | * |
611 | * The %FW_CDEV_IOC_GET_CYCLE_TIMER2 works like |
612 | * %FW_CDEV_IOC_GET_CYCLE_TIMER but lets you choose a clock like with POSIX' |
613 | * clock_gettime function. Supported @clk_id values are POSIX' %CLOCK_REALTIME |
614 | * and %CLOCK_MONOTONIC and Linux' %CLOCK_MONOTONIC_RAW. |
615 | */ |
616 | struct fw_cdev_get_cycle_timer2 { |
617 | __s64 tv_sec; |
618 | __s32 tv_nsec; |
619 | __s32 clk_id; |
620 | __u32 cycle_timer; |
621 | }; |
622 | |
623 | /** |
624 | * struct fw_cdev_allocate_iso_resource - (De)allocate a channel or bandwidth |
625 | * @closure: Passed back to userspace in correponding iso resource events |
626 | * @channels: Isochronous channels of which one is to be (de)allocated |
627 | * @bandwidth: Isochronous bandwidth units to be (de)allocated |
628 | * @handle: Handle to the allocation, written by the kernel (only valid in |
629 | * case of %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctls) |
630 | * |
631 | * The %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctl initiates allocation of an |
632 | * isochronous channel and/or of isochronous bandwidth at the isochronous |
633 | * resource manager (IRM). Only one of the channels specified in @channels is |
634 | * allocated. An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED is sent after |
635 | * communication with the IRM, indicating success or failure in the event data. |
636 | * The kernel will automatically reallocate the resources after bus resets. |
637 | * Should a reallocation fail, an %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event |
638 | * will be sent. The kernel will also automatically deallocate the resources |
639 | * when the file descriptor is closed. |
640 | * |
641 | * The %FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE ioctl can be used to initiate |
642 | * deallocation of resources which were allocated as described above. |
643 | * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event concludes this operation. |
644 | * |
645 | * The %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE ioctl is a variant of allocation |
646 | * without automatic re- or deallocation. |
647 | * An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event concludes this operation, |
648 | * indicating success or failure in its data. |
649 | * |
650 | * The %FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE ioctl works like |
651 | * %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE except that resources are freed |
652 | * instead of allocated. |
653 | * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event concludes this operation. |
654 | * |
655 | * To summarize, %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE allocates iso resources |
656 | * for the lifetime of the fd or @handle. |
657 | * In contrast, %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE allocates iso resources |
658 | * for the duration of a bus generation. |
659 | * |
660 | * @channels is a host-endian bitfield with the least significant bit |
661 | * representing channel 0 and the most significant bit representing channel 63: |
662 | * 1ULL << c for each channel c that is a candidate for (de)allocation. |
663 | * |
664 | * @bandwidth is expressed in bandwidth allocation units, i.e. the time to send |
665 | * one quadlet of data (payload or header data) at speed S1600. |
666 | */ |
667 | struct fw_cdev_allocate_iso_resource { |
668 | __u64 closure; |
669 | __u64 channels; |
670 | __u32 bandwidth; |
671 | __u32 handle; |
672 | }; |
673 | |
674 | /** |
675 | * struct fw_cdev_send_stream_packet - send an asynchronous stream packet |
676 | * @length: Length of outgoing payload, in bytes |
677 | * @tag: Data format tag |
678 | * @channel: Isochronous channel to transmit to |
679 | * @sy: Synchronization code |
680 | * @closure: Passed back to userspace in the response event |
681 | * @data: Userspace pointer to payload |
682 | * @generation: The bus generation where packet is valid |
683 | * @speed: Speed to transmit at |
684 | * |
685 | * The %FW_CDEV_IOC_SEND_STREAM_PACKET ioctl sends an asynchronous stream packet |
686 | * to every device which is listening to the specified channel. The kernel |
687 | * writes an &fw_cdev_event_response event which indicates success or failure of |
688 | * the transmission. |
689 | */ |
690 | struct fw_cdev_send_stream_packet { |
691 | __u32 length; |
692 | __u32 tag; |
693 | __u32 channel; |
694 | __u32 sy; |
695 | __u64 closure; |
696 | __u64 data; |
697 | __u32 generation; |
698 | __u32 speed; |
699 | }; |
700 | |
701 | #endif /* _LINUX_FIREWIRE_CDEV_H */ |
702 |
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