2 * Char device interface.
4 * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 #ifndef _LINUX_FIREWIRE_CDEV_H
22 #define _LINUX_FIREWIRE_CDEV_H
24 #include <linux/ioctl.h>
25 #include <linux/types.h>
26 #include <linux/firewire-constants.h>
28 #define FW_CDEV_EVENT_BUS_RESET 0x00
29 #define FW_CDEV_EVENT_RESPONSE 0x01
30 #define FW_CDEV_EVENT_REQUEST 0x02
31 #define FW_CDEV_EVENT_ISO_INTERRUPT 0x03
32 #define FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED 0x04
33 #define FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED 0x05
36 * struct fw_cdev_event_common - Common part of all fw_cdev_event_ types
37 * @closure: For arbitrary use by userspace
38 * @type: Discriminates the fw_cdev_event_ types
40 * This struct may be used to access generic members of all fw_cdev_event_
41 * types regardless of the specific type.
43 * Data passed in the @closure field for a request will be returned in the
44 * corresponding event. It is big enough to hold a pointer on all platforms.
45 * The ioctl used to set @closure depends on the @type of event.
47 struct fw_cdev_event_common {
53 * struct fw_cdev_event_bus_reset - Sent when a bus reset occurred
54 * @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_GET_INFO ioctl
55 * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_BUS_RESET
56 * @node_id: New node ID of this node
57 * @local_node_id: Node ID of the local node, i.e. of the controller
58 * @bm_node_id: Node ID of the bus manager
59 * @irm_node_id: Node ID of the iso resource manager
60 * @root_node_id: Node ID of the root node
61 * @generation: New bus generation
63 * This event is sent when the bus the device belongs to goes through a bus
64 * reset. It provides information about the new bus configuration, such as
65 * new node ID for this device, new root ID, and others.
67 struct fw_cdev_event_bus_reset {
79 * struct fw_cdev_event_response - Sent when a response packet was received
80 * @closure: See &fw_cdev_event_common;
81 * set by %FW_CDEV_IOC_SEND_REQUEST ioctl
82 * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_RESPONSE
83 * @rcode: Response code returned by the remote node
84 * @length: Data length, i.e. the response's payload size in bytes
85 * @data: Payload data, if any
87 * This event is sent when the stack receives a response to an outgoing request
88 * sent by %FW_CDEV_IOC_SEND_REQUEST ioctl. The payload data for responses
89 * carrying data (read and lock responses) follows immediately and can be
90 * accessed through the @data field.
92 struct fw_cdev_event_response {
101 * struct fw_cdev_event_request - Sent on incoming request to an address region
102 * @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_ALLOCATE ioctl
103 * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_REQUEST
104 * @tcode: Transaction code of the incoming request
105 * @offset: The offset into the 48-bit per-node address space
106 * @handle: Reference to the kernel-side pending request
107 * @length: Data length, i.e. the request's payload size in bytes
108 * @data: Incoming data, if any
110 * This event is sent when the stack receives an incoming request to an address
111 * region registered using the %FW_CDEV_IOC_ALLOCATE ioctl. The request is
112 * guaranteed to be completely contained in the specified region. Userspace is
113 * responsible for sending the response by %FW_CDEV_IOC_SEND_RESPONSE ioctl,
114 * using the same @handle.
116 * The payload data for requests carrying data (write and lock requests)
117 * follows immediately and can be accessed through the @data field.
119 struct fw_cdev_event_request {
130 * struct fw_cdev_event_iso_interrupt - Sent when an iso packet was completed
131 * @closure: See &fw_cdev_event_common;
132 * set by %FW_CDEV_CREATE_ISO_CONTEXT ioctl
133 * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_ISO_INTERRUPT
134 * @cycle: Cycle counter of the interrupt packet
135 * @header_length: Total length of following headers, in bytes
136 * @header: Stripped headers, if any
138 * This event is sent when the controller has completed an &fw_cdev_iso_packet
139 * with the %FW_CDEV_ISO_INTERRUPT bit set. In the receive case, the headers
140 * stripped of all packets up until and including the interrupt packet are
141 * returned in the @header field.
143 struct fw_cdev_event_iso_interrupt {
152 * struct fw_cdev_event_iso_resource - Iso resources were allocated or freed
153 * @closure: See &fw_cdev_event_common;
154 * set by %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctl
155 * @type: %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
156 * %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
157 * @handle: Reference by which an allocated resource can be deallocated
158 * @channel: Isochronous channel which was (de)allocated, if any
159 * @bandwidth: Bandwidth allocation units which were (de)allocated, if any
160 * @channels_available: Last known availability of channels
161 * @bandwidth_available: Last known availability of bandwidth
163 * An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event is sent after an isochronous
164 * resource was allocated at the IRM. The client has to check @channel and
165 * @bandwidth for whether the allocation actually succeeded.
167 * @channel is <0 if no channel was allocated.
168 * @bandwidth is 0 if no bandwidth was allocated.
170 * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event is sent after an isochronous
171 * resource was deallocated at the IRM. It is also sent when automatic
172 * reallocation after a bus reset failed.
174 struct fw_cdev_event_iso_resource {
183 * union fw_cdev_event - Convenience union of fw_cdev_event_ types
184 * @common: Valid for all types
185 * @bus_reset: Valid if @common.type == %FW_CDEV_EVENT_BUS_RESET
186 * @response: Valid if @common.type == %FW_CDEV_EVENT_RESPONSE
187 * @request: Valid if @common.type == %FW_CDEV_EVENT_REQUEST
188 * @iso_interrupt: Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT
189 * @iso_resource: Valid if @common.type ==
190 * %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
191 * %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
193 * Convenience union for userspace use. Events could be read(2) into an
194 * appropriately aligned char buffer and then cast to this union for further
195 * processing. Note that for a request, response or iso_interrupt event,
196 * the data[] or header[] may make the size of the full event larger than
197 * sizeof(union fw_cdev_event). Also note that if you attempt to read(2)
198 * an event into a buffer that is not large enough for it, the data that does
199 * not fit will be discarded so that the next read(2) will return a new event.
201 union fw_cdev_event {
202 struct fw_cdev_event_common common;
203 struct fw_cdev_event_bus_reset bus_reset;
204 struct fw_cdev_event_response response;
205 struct fw_cdev_event_request request;
206 struct fw_cdev_event_iso_interrupt iso_interrupt;
207 struct fw_cdev_event_iso_resource iso_resource;
210 /* available since kernel version 2.6.22 */
211 #define FW_CDEV_IOC_GET_INFO _IOWR('#', 0x00, struct fw_cdev_get_info)
212 #define FW_CDEV_IOC_SEND_REQUEST _IOW('#', 0x01, struct fw_cdev_send_request)
213 #define FW_CDEV_IOC_ALLOCATE _IOWR('#', 0x02, struct fw_cdev_allocate)
214 #define FW_CDEV_IOC_DEALLOCATE _IOW('#', 0x03, struct fw_cdev_deallocate)
215 #define FW_CDEV_IOC_SEND_RESPONSE _IOW('#', 0x04, struct fw_cdev_send_response)
216 #define FW_CDEV_IOC_INITIATE_BUS_RESET _IOW('#', 0x05, struct fw_cdev_initiate_bus_reset)
217 #define FW_CDEV_IOC_ADD_DESCRIPTOR _IOWR('#', 0x06, struct fw_cdev_add_descriptor)
218 #define FW_CDEV_IOC_REMOVE_DESCRIPTOR _IOW('#', 0x07, struct fw_cdev_remove_descriptor)
219 #define FW_CDEV_IOC_CREATE_ISO_CONTEXT _IOWR('#', 0x08, struct fw_cdev_create_iso_context)
220 #define FW_CDEV_IOC_QUEUE_ISO _IOWR('#', 0x09, struct fw_cdev_queue_iso)
221 #define FW_CDEV_IOC_START_ISO _IOW('#', 0x0a, struct fw_cdev_start_iso)
222 #define FW_CDEV_IOC_STOP_ISO _IOW('#', 0x0b, struct fw_cdev_stop_iso)
224 /* available since kernel version 2.6.24 */
225 #define FW_CDEV_IOC_GET_CYCLE_TIMER _IOR('#', 0x0c, struct fw_cdev_get_cycle_timer)
227 /* available since kernel version 2.6.30 */
228 #define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE _IOWR('#', 0x0d, struct fw_cdev_allocate_iso_resource)
229 #define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE _IOW('#', 0x0e, struct fw_cdev_deallocate)
231 /* FW_CDEV_VERSION History
233 * 1 Feb 18, 2007: Initial version.
235 #define FW_CDEV_VERSION 1
238 * struct fw_cdev_get_info - General purpose information ioctl
239 * @version: The version field is just a running serial number.
240 * We never break backwards compatibility, but may add more
241 * structs and ioctls in later revisions.
242 * @rom_length: If @rom is non-zero, at most rom_length bytes of configuration
243 * ROM will be copied into that user space address. In either
244 * case, @rom_length is updated with the actual length of the
246 * @rom: If non-zero, address of a buffer to be filled by a copy of the
247 * device's configuration ROM
248 * @bus_reset: If non-zero, address of a buffer to be filled by a
249 * &struct fw_cdev_event_bus_reset with the current state
250 * of the bus. This does not cause a bus reset to happen.
251 * @bus_reset_closure: Value of &closure in this and subsequent bus reset events
252 * @card: The index of the card this device belongs to
254 struct fw_cdev_get_info {
259 __u64 bus_reset_closure;
264 * struct fw_cdev_send_request - Send an asynchronous request packet
265 * @tcode: Transaction code of the request
266 * @length: Length of outgoing payload, in bytes
267 * @offset: 48-bit offset at destination node
268 * @closure: Passed back to userspace in the response event
269 * @data: Userspace pointer to payload
270 * @generation: The bus generation where packet is valid
272 * Send a request to the device. This ioctl implements all outgoing requests.
273 * Both quadlet and block request specify the payload as a pointer to the data
274 * in the @data field. Once the transaction completes, the kernel writes an
275 * &fw_cdev_event_response event back. The @closure field is passed back to
276 * user space in the response event.
278 struct fw_cdev_send_request {
288 * struct fw_cdev_send_response - Send an asynchronous response packet
289 * @rcode: Response code as determined by the userspace handler
290 * @length: Length of outgoing payload, in bytes
291 * @data: Userspace pointer to payload
292 * @handle: The handle from the &fw_cdev_event_request
294 * Send a response to an incoming request. By setting up an address range using
295 * the %FW_CDEV_IOC_ALLOCATE ioctl, userspace can listen for incoming requests. An
296 * incoming request will generate an %FW_CDEV_EVENT_REQUEST, and userspace must
297 * send a reply using this ioctl. The event has a handle to the kernel-side
298 * pending transaction, which should be used with this ioctl.
300 struct fw_cdev_send_response {
308 * struct fw_cdev_allocate - Allocate a CSR address range
309 * @offset: Start offset of the address range
310 * @closure: To be passed back to userspace in request events
311 * @length: Length of the address range, in bytes
312 * @handle: Handle to the allocation, written by the kernel
314 * Allocate an address range in the 48-bit address space on the local node
315 * (the controller). This allows userspace to listen for requests with an
316 * offset within that address range. When the kernel receives a request
317 * within the range, an &fw_cdev_event_request event will be written back.
318 * The @closure field is passed back to userspace in the response event.
319 * The @handle field is an out parameter, returning a handle to the allocated
320 * range to be used for later deallocation of the range.
322 struct fw_cdev_allocate {
330 * struct fw_cdev_deallocate - Free a CSR address range or isochronous resource
331 * @handle: Handle to the address range or iso resource, as returned by the
332 * kernel when the range or resource was allocated
334 struct fw_cdev_deallocate {
338 #define FW_CDEV_LONG_RESET 0
339 #define FW_CDEV_SHORT_RESET 1
342 * struct fw_cdev_initiate_bus_reset - Initiate a bus reset
343 * @type: %FW_CDEV_SHORT_RESET or %FW_CDEV_LONG_RESET
345 * Initiate a bus reset for the bus this device is on. The bus reset can be
346 * either the original (long) bus reset or the arbitrated (short) bus reset
347 * introduced in 1394a-2000.
349 struct fw_cdev_initiate_bus_reset {
350 __u32 type; /* FW_CDEV_SHORT_RESET or FW_CDEV_LONG_RESET */
354 * struct fw_cdev_add_descriptor - Add contents to the local node's config ROM
355 * @immediate: If non-zero, immediate key to insert before pointer
356 * @key: Upper 8 bits of root directory pointer
357 * @data: Userspace pointer to contents of descriptor block
358 * @length: Length of descriptor block data, in bytes
359 * @handle: Handle to the descriptor, written by the kernel
361 * Add a descriptor block and optionally a preceding immediate key to the local
362 * node's configuration ROM.
364 * The @key field specifies the upper 8 bits of the descriptor root directory
365 * pointer and the @data and @length fields specify the contents. The @key
366 * should be of the form 0xXX000000. The offset part of the root directory entry
367 * will be filled in by the kernel.
369 * If not 0, the @immediate field specifies an immediate key which will be
370 * inserted before the root directory pointer.
372 * If successful, the kernel adds the descriptor and writes back a handle to the
373 * kernel-side object to be used for later removal of the descriptor block and
376 struct fw_cdev_add_descriptor {
385 * struct fw_cdev_remove_descriptor - Remove contents from the configuration ROM
386 * @handle: Handle to the descriptor, as returned by the kernel when the
387 * descriptor was added
389 * Remove a descriptor block and accompanying immediate key from the local
390 * node's configuration ROM.
392 struct fw_cdev_remove_descriptor {
396 #define FW_CDEV_ISO_CONTEXT_TRANSMIT 0
397 #define FW_CDEV_ISO_CONTEXT_RECEIVE 1
400 * struct fw_cdev_create_iso_context - Create a context for isochronous IO
401 * @type: %FW_CDEV_ISO_CONTEXT_TRANSMIT or %FW_CDEV_ISO_CONTEXT_RECEIVE
402 * @header_size: Header size to strip for receive contexts
403 * @channel: Channel to bind to
404 * @speed: Speed to transmit at
405 * @closure: To be returned in &fw_cdev_event_iso_interrupt
406 * @handle: Handle to context, written back by kernel
408 * Prior to sending or receiving isochronous I/O, a context must be created.
409 * The context records information about the transmit or receive configuration
410 * and typically maps to an underlying hardware resource. A context is set up
411 * for either sending or receiving. It is bound to a specific isochronous
414 * If a context was successfully created, the kernel writes back a handle to the
415 * context, which must be passed in for subsequent operations on that context.
417 struct fw_cdev_create_iso_context {
426 #define FW_CDEV_ISO_PAYLOAD_LENGTH(v) (v)
427 #define FW_CDEV_ISO_INTERRUPT (1 << 16)
428 #define FW_CDEV_ISO_SKIP (1 << 17)
429 #define FW_CDEV_ISO_SYNC (1 << 17)
430 #define FW_CDEV_ISO_TAG(v) ((v) << 18)
431 #define FW_CDEV_ISO_SY(v) ((v) << 20)
432 #define FW_CDEV_ISO_HEADER_LENGTH(v) ((v) << 24)
435 * struct fw_cdev_iso_packet - Isochronous packet
436 * @control: Contains the header length (8 uppermost bits), the sy field
437 * (4 bits), the tag field (2 bits), a sync flag (1 bit),
438 * a skip flag (1 bit), an interrupt flag (1 bit), and the
439 * payload length (16 lowermost bits)
440 * @header: Header and payload
442 * &struct fw_cdev_iso_packet is used to describe isochronous packet queues.
444 * Use the FW_CDEV_ISO_ macros to fill in @control. The sy and tag fields are
445 * specified by IEEE 1394a and IEC 61883.
447 * FIXME - finish this documentation
449 struct fw_cdev_iso_packet {
455 * struct fw_cdev_queue_iso - Queue isochronous packets for I/O
456 * @packets: Userspace pointer to packet data
457 * @data: Pointer into mmap()'ed payload buffer
458 * @size: Size of packet data in bytes
459 * @handle: Isochronous context handle
461 * Queue a number of isochronous packets for reception or transmission.
462 * This ioctl takes a pointer to an array of &fw_cdev_iso_packet structs,
463 * which describe how to transmit from or receive into a contiguous region
464 * of a mmap()'ed payload buffer. As part of the packet descriptors,
465 * a series of headers can be supplied, which will be prepended to the
466 * payload during DMA.
468 * The kernel may or may not queue all packets, but will write back updated
469 * values of the @packets, @data and @size fields, so the ioctl can be
470 * resubmitted easily.
472 struct fw_cdev_queue_iso {
479 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG0 1
480 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG1 2
481 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG2 4
482 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG3 8
483 #define FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS 15
486 * struct fw_cdev_start_iso - Start an isochronous transmission or reception
487 * @cycle: Cycle in which to start I/O. If @cycle is greater than or
488 * equal to 0, the I/O will start on that cycle.
489 * @sync: Determines the value to wait for for receive packets that have
490 * the %FW_CDEV_ISO_SYNC bit set
491 * @tags: Tag filter bit mask. Only valid for isochronous reception.
492 * Determines the tag values for which packets will be accepted.
493 * Use FW_CDEV_ISO_CONTEXT_MATCH_ macros to set @tags.
494 * @handle: Isochronous context handle within which to transmit or receive
496 struct fw_cdev_start_iso {
504 * struct fw_cdev_stop_iso - Stop an isochronous transmission or reception
505 * @handle: Handle of isochronous context to stop
507 struct fw_cdev_stop_iso {
512 * struct fw_cdev_get_cycle_timer - read cycle timer register
513 * @local_time: system time, in microseconds since the Epoch
514 * @cycle_timer: isochronous cycle timer, as per OHCI 1.1 clause 5.13
516 * The %FW_CDEV_IOC_GET_CYCLE_TIMER ioctl reads the isochronous cycle timer
517 * and also the system clock. This allows to express the receive time of an
518 * isochronous packet as a system time with microsecond accuracy.
520 struct fw_cdev_get_cycle_timer {
526 * struct fw_cdev_allocate_iso_resource - Allocate a channel or bandwidth
527 * @closure: Passed back to userspace in correponding iso resource events
528 * @channels: Isochronous channels of which one is to be allocated
529 * @bandwidth: Isochronous bandwidth units to be allocated
530 * @handle: Handle to the allocation, written by the kernel
532 * The %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctl initiates allocation of an
533 * isochronous channel and/or of isochronous bandwidth at the isochronous
534 * resource manager (IRM). Only one of the channels specified in @channels is
535 * allocated. An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED is sent after
536 * communication with the IRM, indicating success or failure in the event data.
537 * The kernel will automatically reallocate the resources after bus resets.
538 * Should a reallocation fail, an %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event
539 * will be sent. The kernel will also automatically deallocate the resources
540 * when the file descriptor is closed.
542 * @channels is a host-endian bitfield with the most significant bit
543 * representing channel 0 and the least significant bit representing channel 63:
546 * @bandwidth is expressed in bandwidth allocation units, i.e. the time to send
547 * one quadlet of data (payload or header data) at speed S1600.
549 struct fw_cdev_allocate_iso_resource {
556 #endif /* _LINUX_FIREWIRE_CDEV_H */