a2612cb16d
This was supposed to be generic "authors or copyright holders"; I mistakenly picked up text from a wrong file. Reported-by: Daniel K. <dk@uw.no> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
701 lines
28 KiB
C
701 lines
28 KiB
C
/*
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* Char device interface.
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*
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* Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _LINUX_FIREWIRE_CDEV_H
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#define _LINUX_FIREWIRE_CDEV_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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#include <linux/firewire-constants.h>
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#define FW_CDEV_EVENT_BUS_RESET 0x00
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#define FW_CDEV_EVENT_RESPONSE 0x01
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#define FW_CDEV_EVENT_REQUEST 0x02
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#define FW_CDEV_EVENT_ISO_INTERRUPT 0x03
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#define FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED 0x04
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#define FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED 0x05
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/**
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* struct fw_cdev_event_common - Common part of all fw_cdev_event_ types
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* @closure: For arbitrary use by userspace
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* @type: Discriminates the fw_cdev_event_ types
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*
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* This struct may be used to access generic members of all fw_cdev_event_
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* types regardless of the specific type.
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*
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* Data passed in the @closure field for a request will be returned in the
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* corresponding event. It is big enough to hold a pointer on all platforms.
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* The ioctl used to set @closure depends on the @type of event.
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*/
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struct fw_cdev_event_common {
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__u64 closure;
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__u32 type;
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};
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/**
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* struct fw_cdev_event_bus_reset - Sent when a bus reset occurred
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* @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_GET_INFO ioctl
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* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_BUS_RESET
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* @node_id: New node ID of this node
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* @local_node_id: Node ID of the local node, i.e. of the controller
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* @bm_node_id: Node ID of the bus manager
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* @irm_node_id: Node ID of the iso resource manager
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* @root_node_id: Node ID of the root node
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* @generation: New bus generation
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*
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* This event is sent when the bus the device belongs to goes through a bus
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* reset. It provides information about the new bus configuration, such as
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* new node ID for this device, new root ID, and others.
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*/
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struct fw_cdev_event_bus_reset {
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__u64 closure;
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__u32 type;
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__u32 node_id;
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__u32 local_node_id;
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__u32 bm_node_id;
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__u32 irm_node_id;
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__u32 root_node_id;
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__u32 generation;
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};
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/**
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* struct fw_cdev_event_response - Sent when a response packet was received
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* @closure: See &fw_cdev_event_common;
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* set by %FW_CDEV_IOC_SEND_REQUEST ioctl
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* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_RESPONSE
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* @rcode: Response code returned by the remote node
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* @length: Data length, i.e. the response's payload size in bytes
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* @data: Payload data, if any
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*
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* This event is sent when the stack receives a response to an outgoing request
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* sent by %FW_CDEV_IOC_SEND_REQUEST ioctl. The payload data for responses
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* carrying data (read and lock responses) follows immediately and can be
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* accessed through the @data field.
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*/
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struct fw_cdev_event_response {
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__u64 closure;
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__u32 type;
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__u32 rcode;
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__u32 length;
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__u32 data[0];
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};
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/**
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* struct fw_cdev_event_request - Sent on incoming request to an address region
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* @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_ALLOCATE ioctl
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* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_REQUEST
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* @tcode: Transaction code of the incoming request
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* @offset: The offset into the 48-bit per-node address space
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* @handle: Reference to the kernel-side pending request
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* @length: Data length, i.e. the request's payload size in bytes
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* @data: Incoming data, if any
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*
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* This event is sent when the stack receives an incoming request to an address
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* region registered using the %FW_CDEV_IOC_ALLOCATE ioctl. The request is
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* guaranteed to be completely contained in the specified region. Userspace is
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* responsible for sending the response by %FW_CDEV_IOC_SEND_RESPONSE ioctl,
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* using the same @handle.
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*
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* The payload data for requests carrying data (write and lock requests)
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* follows immediately and can be accessed through the @data field.
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*/
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struct fw_cdev_event_request {
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__u64 closure;
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__u32 type;
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__u32 tcode;
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__u64 offset;
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__u32 handle;
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__u32 length;
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__u32 data[0];
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};
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/**
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* struct fw_cdev_event_iso_interrupt - Sent when an iso packet was completed
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* @closure: See &fw_cdev_event_common;
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* set by %FW_CDEV_CREATE_ISO_CONTEXT ioctl
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* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_ISO_INTERRUPT
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* @cycle: Cycle counter of the interrupt packet
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* @header_length: Total length of following headers, in bytes
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* @header: Stripped headers, if any
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*
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* This event is sent when the controller has completed an &fw_cdev_iso_packet
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* with the %FW_CDEV_ISO_INTERRUPT bit set. In the receive case, the headers
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* stripped of all packets up until and including the interrupt packet are
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* returned in the @header field. The amount of header data per packet is as
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* specified at iso context creation by &fw_cdev_create_iso_context.header_size.
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*
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* In version 1 of this ABI, header data consisted of the 1394 isochronous
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* packet header, followed by quadlets from the packet payload if
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* &fw_cdev_create_iso_context.header_size > 4.
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*
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* In version 2 of this ABI, header data consist of the 1394 isochronous
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* packet header, followed by a timestamp quadlet if
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* &fw_cdev_create_iso_context.header_size > 4, followed by quadlets from the
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* packet payload if &fw_cdev_create_iso_context.header_size > 8.
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*
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* Behaviour of ver. 1 of this ABI is no longer available since ABI ver. 2.
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*
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* Format of 1394 iso packet header: 16 bits len, 2 bits tag, 6 bits channel,
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* 4 bits tcode, 4 bits sy, in big endian byte order. Format of timestamp:
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* 16 bits invalid, 3 bits cycleSeconds, 13 bits cycleCount, in big endian byte
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* order.
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*/
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struct fw_cdev_event_iso_interrupt {
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__u64 closure;
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__u32 type;
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__u32 cycle;
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__u32 header_length;
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__u32 header[0];
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};
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/**
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* struct fw_cdev_event_iso_resource - Iso resources were allocated or freed
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* @closure: See &fw_cdev_event_common;
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* set by %FW_CDEV_IOC_(DE)ALLOCATE_ISO_RESOURCE(_ONCE) ioctl
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* @type: %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
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* %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
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* @handle: Reference by which an allocated resource can be deallocated
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* @channel: Isochronous channel which was (de)allocated, if any
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* @bandwidth: Bandwidth allocation units which were (de)allocated, if any
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*
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* An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event is sent after an isochronous
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* resource was allocated at the IRM. The client has to check @channel and
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* @bandwidth for whether the allocation actually succeeded.
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*
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* An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event is sent after an isochronous
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* resource was deallocated at the IRM. It is also sent when automatic
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* reallocation after a bus reset failed.
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*
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* @channel is <0 if no channel was (de)allocated or if reallocation failed.
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* @bandwidth is 0 if no bandwidth was (de)allocated or if reallocation failed.
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*/
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struct fw_cdev_event_iso_resource {
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__u64 closure;
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__u32 type;
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__u32 handle;
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__s32 channel;
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__s32 bandwidth;
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};
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/**
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* union fw_cdev_event - Convenience union of fw_cdev_event_ types
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* @common: Valid for all types
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* @bus_reset: Valid if @common.type == %FW_CDEV_EVENT_BUS_RESET
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* @response: Valid if @common.type == %FW_CDEV_EVENT_RESPONSE
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* @request: Valid if @common.type == %FW_CDEV_EVENT_REQUEST
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* @iso_interrupt: Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT
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* @iso_resource: Valid if @common.type ==
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* %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
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* %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
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*
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* Convenience union for userspace use. Events could be read(2) into an
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* appropriately aligned char buffer and then cast to this union for further
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* processing. Note that for a request, response or iso_interrupt event,
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* the data[] or header[] may make the size of the full event larger than
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* sizeof(union fw_cdev_event). Also note that if you attempt to read(2)
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* an event into a buffer that is not large enough for it, the data that does
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* not fit will be discarded so that the next read(2) will return a new event.
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*/
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union fw_cdev_event {
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struct fw_cdev_event_common common;
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struct fw_cdev_event_bus_reset bus_reset;
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struct fw_cdev_event_response response;
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struct fw_cdev_event_request request;
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struct fw_cdev_event_iso_interrupt iso_interrupt;
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struct fw_cdev_event_iso_resource iso_resource;
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};
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/* available since kernel version 2.6.22 */
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#define FW_CDEV_IOC_GET_INFO _IOWR('#', 0x00, struct fw_cdev_get_info)
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#define FW_CDEV_IOC_SEND_REQUEST _IOW('#', 0x01, struct fw_cdev_send_request)
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#define FW_CDEV_IOC_ALLOCATE _IOWR('#', 0x02, struct fw_cdev_allocate)
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#define FW_CDEV_IOC_DEALLOCATE _IOW('#', 0x03, struct fw_cdev_deallocate)
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#define FW_CDEV_IOC_SEND_RESPONSE _IOW('#', 0x04, struct fw_cdev_send_response)
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#define FW_CDEV_IOC_INITIATE_BUS_RESET _IOW('#', 0x05, struct fw_cdev_initiate_bus_reset)
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#define FW_CDEV_IOC_ADD_DESCRIPTOR _IOWR('#', 0x06, struct fw_cdev_add_descriptor)
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#define FW_CDEV_IOC_REMOVE_DESCRIPTOR _IOW('#', 0x07, struct fw_cdev_remove_descriptor)
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#define FW_CDEV_IOC_CREATE_ISO_CONTEXT _IOWR('#', 0x08, struct fw_cdev_create_iso_context)
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#define FW_CDEV_IOC_QUEUE_ISO _IOWR('#', 0x09, struct fw_cdev_queue_iso)
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#define FW_CDEV_IOC_START_ISO _IOW('#', 0x0a, struct fw_cdev_start_iso)
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#define FW_CDEV_IOC_STOP_ISO _IOW('#', 0x0b, struct fw_cdev_stop_iso)
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/* available since kernel version 2.6.24 */
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#define FW_CDEV_IOC_GET_CYCLE_TIMER _IOR('#', 0x0c, struct fw_cdev_get_cycle_timer)
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/* available since kernel version 2.6.30 */
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#define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE _IOWR('#', 0x0d, struct fw_cdev_allocate_iso_resource)
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#define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE _IOW('#', 0x0e, struct fw_cdev_deallocate)
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#define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x0f, struct fw_cdev_allocate_iso_resource)
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#define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x10, struct fw_cdev_allocate_iso_resource)
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#define FW_CDEV_IOC_GET_SPEED _IO('#', 0x11) /* returns speed code */
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#define FW_CDEV_IOC_SEND_BROADCAST_REQUEST _IOW('#', 0x12, struct fw_cdev_send_request)
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#define FW_CDEV_IOC_SEND_STREAM_PACKET _IOW('#', 0x13, struct fw_cdev_send_stream_packet)
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/* available since kernel version 2.6.34 */
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#define FW_CDEV_IOC_GET_CYCLE_TIMER2 _IOWR('#', 0x14, struct fw_cdev_get_cycle_timer2)
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/*
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* FW_CDEV_VERSION History
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* 1 (2.6.22) - initial version
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* 2 (2.6.30) - changed &fw_cdev_event_iso_interrupt.header if
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* &fw_cdev_create_iso_context.header_size is 8 or more
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* (2.6.32) - added time stamp to xmit &fw_cdev_event_iso_interrupt
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* (2.6.33) - IR has always packet-per-buffer semantics now, not one of
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* dual-buffer or packet-per-buffer depending on hardware
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* 3 (2.6.34) - made &fw_cdev_get_cycle_timer reliable
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*/
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#define FW_CDEV_VERSION 3
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/**
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* struct fw_cdev_get_info - General purpose information ioctl
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* @version: The version field is just a running serial number.
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* We never break backwards compatibility, but may add more
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* structs and ioctls in later revisions.
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* @rom_length: If @rom is non-zero, at most rom_length bytes of configuration
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* ROM will be copied into that user space address. In either
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* case, @rom_length is updated with the actual length of the
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* configuration ROM.
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* @rom: If non-zero, address of a buffer to be filled by a copy of the
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* device's configuration ROM
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* @bus_reset: If non-zero, address of a buffer to be filled by a
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* &struct fw_cdev_event_bus_reset with the current state
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* of the bus. This does not cause a bus reset to happen.
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* @bus_reset_closure: Value of &closure in this and subsequent bus reset events
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* @card: The index of the card this device belongs to
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*/
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struct fw_cdev_get_info {
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__u32 version;
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__u32 rom_length;
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__u64 rom;
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__u64 bus_reset;
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__u64 bus_reset_closure;
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__u32 card;
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};
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/**
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* struct fw_cdev_send_request - Send an asynchronous request packet
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* @tcode: Transaction code of the request
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* @length: Length of outgoing payload, in bytes
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* @offset: 48-bit offset at destination node
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* @closure: Passed back to userspace in the response event
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* @data: Userspace pointer to payload
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* @generation: The bus generation where packet is valid
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*
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* Send a request to the device. This ioctl implements all outgoing requests.
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* Both quadlet and block request specify the payload as a pointer to the data
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* in the @data field. Once the transaction completes, the kernel writes an
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* &fw_cdev_event_response event back. The @closure field is passed back to
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* user space in the response event.
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*/
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struct fw_cdev_send_request {
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__u32 tcode;
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__u32 length;
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__u64 offset;
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__u64 closure;
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__u64 data;
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__u32 generation;
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};
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/**
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* struct fw_cdev_send_response - Send an asynchronous response packet
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* @rcode: Response code as determined by the userspace handler
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* @length: Length of outgoing payload, in bytes
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* @data: Userspace pointer to payload
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* @handle: The handle from the &fw_cdev_event_request
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*
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* Send a response to an incoming request. By setting up an address range using
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* the %FW_CDEV_IOC_ALLOCATE ioctl, userspace can listen for incoming requests. An
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* incoming request will generate an %FW_CDEV_EVENT_REQUEST, and userspace must
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* send a reply using this ioctl. The event has a handle to the kernel-side
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* pending transaction, which should be used with this ioctl.
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*/
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struct fw_cdev_send_response {
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__u32 rcode;
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__u32 length;
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__u64 data;
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__u32 handle;
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};
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/**
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* struct fw_cdev_allocate - Allocate a CSR address range
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* @offset: Start offset of the address range
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* @closure: To be passed back to userspace in request events
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* @length: Length of the address range, in bytes
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* @handle: Handle to the allocation, written by the kernel
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*
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* Allocate an address range in the 48-bit address space on the local node
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* (the controller). This allows userspace to listen for requests with an
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* offset within that address range. When the kernel receives a request
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* within the range, an &fw_cdev_event_request event will be written back.
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* The @closure field is passed back to userspace in the response event.
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* The @handle field is an out parameter, returning a handle to the allocated
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* range to be used for later deallocation of the range.
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*
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* The address range is allocated on all local nodes. The address allocation
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* is exclusive except for the FCP command and response registers.
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*/
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struct fw_cdev_allocate {
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__u64 offset;
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__u64 closure;
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__u32 length;
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__u32 handle;
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};
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/**
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* struct fw_cdev_deallocate - Free a CSR address range or isochronous resource
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* @handle: Handle to the address range or iso resource, as returned by the
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* kernel when the range or resource was allocated
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*/
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struct fw_cdev_deallocate {
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__u32 handle;
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};
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#define FW_CDEV_LONG_RESET 0
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#define FW_CDEV_SHORT_RESET 1
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/**
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* struct fw_cdev_initiate_bus_reset - Initiate a bus reset
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* @type: %FW_CDEV_SHORT_RESET or %FW_CDEV_LONG_RESET
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*
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* Initiate a bus reset for the bus this device is on. The bus reset can be
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* either the original (long) bus reset or the arbitrated (short) bus reset
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* introduced in 1394a-2000.
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*/
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struct fw_cdev_initiate_bus_reset {
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__u32 type; /* FW_CDEV_SHORT_RESET or FW_CDEV_LONG_RESET */
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};
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/**
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* struct fw_cdev_add_descriptor - Add contents to the local node's config ROM
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* @immediate: If non-zero, immediate key to insert before pointer
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* @key: Upper 8 bits of root directory pointer
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* @data: Userspace pointer to contents of descriptor block
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* @length: Length of descriptor block data, in quadlets
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* @handle: Handle to the descriptor, written by the kernel
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*
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* Add a descriptor block and optionally a preceding immediate key to the local
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* node's configuration ROM.
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*
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* The @key field specifies the upper 8 bits of the descriptor root directory
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* pointer and the @data and @length fields specify the contents. The @key
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* should be of the form 0xXX000000. The offset part of the root directory entry
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* will be filled in by the kernel.
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*
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* If not 0, the @immediate field specifies an immediate key which will be
|
|
* inserted before the root directory pointer.
|
|
*
|
|
* @immediate, @key, and @data array elements are CPU-endian quadlets.
|
|
*
|
|
* If successful, the kernel adds the descriptor and writes back a handle to the
|
|
* kernel-side object to be used for later removal of the descriptor block and
|
|
* immediate key.
|
|
*
|
|
* This ioctl affects the configuration ROMs of all local nodes.
|
|
* The ioctl only succeeds on device files which represent a local node.
|
|
*/
|
|
struct fw_cdev_add_descriptor {
|
|
__u32 immediate;
|
|
__u32 key;
|
|
__u64 data;
|
|
__u32 length;
|
|
__u32 handle;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_remove_descriptor - Remove contents from the configuration ROM
|
|
* @handle: Handle to the descriptor, as returned by the kernel when the
|
|
* descriptor was added
|
|
*
|
|
* Remove a descriptor block and accompanying immediate key from the local
|
|
* nodes' configuration ROMs.
|
|
*/
|
|
struct fw_cdev_remove_descriptor {
|
|
__u32 handle;
|
|
};
|
|
|
|
#define FW_CDEV_ISO_CONTEXT_TRANSMIT 0
|
|
#define FW_CDEV_ISO_CONTEXT_RECEIVE 1
|
|
|
|
/**
|
|
* struct fw_cdev_create_iso_context - Create a context for isochronous IO
|
|
* @type: %FW_CDEV_ISO_CONTEXT_TRANSMIT or %FW_CDEV_ISO_CONTEXT_RECEIVE
|
|
* @header_size: Header size to strip for receive contexts
|
|
* @channel: Channel to bind to
|
|
* @speed: Speed for transmit contexts
|
|
* @closure: To be returned in &fw_cdev_event_iso_interrupt
|
|
* @handle: Handle to context, written back by kernel
|
|
*
|
|
* Prior to sending or receiving isochronous I/O, a context must be created.
|
|
* The context records information about the transmit or receive configuration
|
|
* and typically maps to an underlying hardware resource. A context is set up
|
|
* for either sending or receiving. It is bound to a specific isochronous
|
|
* channel.
|
|
*
|
|
* If a context was successfully created, the kernel writes back a handle to the
|
|
* context, which must be passed in for subsequent operations on that context.
|
|
*
|
|
* For receive contexts, @header_size must be at least 4 and must be a multiple
|
|
* of 4.
|
|
*
|
|
* Note that the effect of a @header_size > 4 depends on
|
|
* &fw_cdev_get_info.version, as documented at &fw_cdev_event_iso_interrupt.
|
|
*/
|
|
struct fw_cdev_create_iso_context {
|
|
__u32 type;
|
|
__u32 header_size;
|
|
__u32 channel;
|
|
__u32 speed;
|
|
__u64 closure;
|
|
__u32 handle;
|
|
};
|
|
|
|
#define FW_CDEV_ISO_PAYLOAD_LENGTH(v) (v)
|
|
#define FW_CDEV_ISO_INTERRUPT (1 << 16)
|
|
#define FW_CDEV_ISO_SKIP (1 << 17)
|
|
#define FW_CDEV_ISO_SYNC (1 << 17)
|
|
#define FW_CDEV_ISO_TAG(v) ((v) << 18)
|
|
#define FW_CDEV_ISO_SY(v) ((v) << 20)
|
|
#define FW_CDEV_ISO_HEADER_LENGTH(v) ((v) << 24)
|
|
|
|
/**
|
|
* struct fw_cdev_iso_packet - Isochronous packet
|
|
* @control: Contains the header length (8 uppermost bits), the sy field
|
|
* (4 bits), the tag field (2 bits), a sync flag (1 bit),
|
|
* a skip flag (1 bit), an interrupt flag (1 bit), and the
|
|
* payload length (16 lowermost bits)
|
|
* @header: Header and payload
|
|
*
|
|
* &struct fw_cdev_iso_packet is used to describe isochronous packet queues.
|
|
*
|
|
* Use the FW_CDEV_ISO_ macros to fill in @control.
|
|
*
|
|
* For transmit packets, the header length must be a multiple of 4 and specifies
|
|
* the numbers of bytes in @header that will be prepended to the packet's
|
|
* payload; these bytes are copied into the kernel and will not be accessed
|
|
* after the ioctl has returned. The sy and tag fields are copied to the iso
|
|
* packet header (these fields are specified by IEEE 1394a and IEC 61883-1).
|
|
* The skip flag specifies that no packet is to be sent in a frame; when using
|
|
* this, all other fields except the interrupt flag must be zero.
|
|
*
|
|
* For receive packets, the header length must be a multiple of the context's
|
|
* header size; if the header length is larger than the context's header size,
|
|
* multiple packets are queued for this entry. The sy and tag fields are
|
|
* ignored. If the sync flag is set, the context drops all packets until
|
|
* a packet with a matching sy field is received (the sync value to wait for is
|
|
* specified in the &fw_cdev_start_iso structure). The payload length defines
|
|
* how many payload bytes can be received for one packet (in addition to payload
|
|
* quadlets that have been defined as headers and are stripped and returned in
|
|
* the &fw_cdev_event_iso_interrupt structure). If more bytes are received, the
|
|
* additional bytes are dropped. If less bytes are received, the remaining
|
|
* bytes in this part of the payload buffer will not be written to, not even by
|
|
* the next packet, i.e., packets received in consecutive frames will not
|
|
* necessarily be consecutive in memory. If an entry has queued multiple
|
|
* packets, the payload length is divided equally among them.
|
|
*
|
|
* When a packet with the interrupt flag set has been completed, the
|
|
* &fw_cdev_event_iso_interrupt event will be sent. An entry that has queued
|
|
* multiple receive packets is completed when its last packet is completed.
|
|
*/
|
|
struct fw_cdev_iso_packet {
|
|
__u32 control;
|
|
__u32 header[0];
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_queue_iso - Queue isochronous packets for I/O
|
|
* @packets: Userspace pointer to packet data
|
|
* @data: Pointer into mmap()'ed payload buffer
|
|
* @size: Size of packet data in bytes
|
|
* @handle: Isochronous context handle
|
|
*
|
|
* Queue a number of isochronous packets for reception or transmission.
|
|
* This ioctl takes a pointer to an array of &fw_cdev_iso_packet structs,
|
|
* which describe how to transmit from or receive into a contiguous region
|
|
* of a mmap()'ed payload buffer. As part of transmit packet descriptors,
|
|
* a series of headers can be supplied, which will be prepended to the
|
|
* payload during DMA.
|
|
*
|
|
* The kernel may or may not queue all packets, but will write back updated
|
|
* values of the @packets, @data and @size fields, so the ioctl can be
|
|
* resubmitted easily.
|
|
*/
|
|
struct fw_cdev_queue_iso {
|
|
__u64 packets;
|
|
__u64 data;
|
|
__u32 size;
|
|
__u32 handle;
|
|
};
|
|
|
|
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG0 1
|
|
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG1 2
|
|
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG2 4
|
|
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG3 8
|
|
#define FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS 15
|
|
|
|
/**
|
|
* struct fw_cdev_start_iso - Start an isochronous transmission or reception
|
|
* @cycle: Cycle in which to start I/O. If @cycle is greater than or
|
|
* equal to 0, the I/O will start on that cycle.
|
|
* @sync: Determines the value to wait for for receive packets that have
|
|
* the %FW_CDEV_ISO_SYNC bit set
|
|
* @tags: Tag filter bit mask. Only valid for isochronous reception.
|
|
* Determines the tag values for which packets will be accepted.
|
|
* Use FW_CDEV_ISO_CONTEXT_MATCH_ macros to set @tags.
|
|
* @handle: Isochronous context handle within which to transmit or receive
|
|
*/
|
|
struct fw_cdev_start_iso {
|
|
__s32 cycle;
|
|
__u32 sync;
|
|
__u32 tags;
|
|
__u32 handle;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_stop_iso - Stop an isochronous transmission or reception
|
|
* @handle: Handle of isochronous context to stop
|
|
*/
|
|
struct fw_cdev_stop_iso {
|
|
__u32 handle;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_get_cycle_timer - read cycle timer register
|
|
* @local_time: system time, in microseconds since the Epoch
|
|
* @cycle_timer: Cycle Time register contents
|
|
*
|
|
* The %FW_CDEV_IOC_GET_CYCLE_TIMER ioctl reads the isochronous cycle timer
|
|
* and also the system clock (%CLOCK_REALTIME). This allows to express the
|
|
* receive time of an isochronous packet as a system time.
|
|
*
|
|
* @cycle_timer consists of 7 bits cycleSeconds, 13 bits cycleCount, and
|
|
* 12 bits cycleOffset, in host byte order. Cf. the Cycle Time register
|
|
* per IEEE 1394 or Isochronous Cycle Timer register per OHCI-1394.
|
|
*
|
|
* In version 1 and 2 of the ABI, this ioctl returned unreliable (non-
|
|
* monotonic) @cycle_timer values on certain controllers.
|
|
*/
|
|
struct fw_cdev_get_cycle_timer {
|
|
__u64 local_time;
|
|
__u32 cycle_timer;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_get_cycle_timer2 - read cycle timer register
|
|
* @tv_sec: system time, seconds
|
|
* @tv_nsec: system time, sub-seconds part in nanoseconds
|
|
* @clk_id: input parameter, clock from which to get the system time
|
|
* @cycle_timer: Cycle Time register contents
|
|
*
|
|
* The %FW_CDEV_IOC_GET_CYCLE_TIMER2 works like
|
|
* %FW_CDEV_IOC_GET_CYCLE_TIMER but lets you choose a clock like with POSIX'
|
|
* clock_gettime function. Supported @clk_id values are POSIX' %CLOCK_REALTIME
|
|
* and %CLOCK_MONOTONIC and Linux' %CLOCK_MONOTONIC_RAW.
|
|
*/
|
|
struct fw_cdev_get_cycle_timer2 {
|
|
__s64 tv_sec;
|
|
__s32 tv_nsec;
|
|
__s32 clk_id;
|
|
__u32 cycle_timer;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_allocate_iso_resource - (De)allocate a channel or bandwidth
|
|
* @closure: Passed back to userspace in correponding iso resource events
|
|
* @channels: Isochronous channels of which one is to be (de)allocated
|
|
* @bandwidth: Isochronous bandwidth units to be (de)allocated
|
|
* @handle: Handle to the allocation, written by the kernel (only valid in
|
|
* case of %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctls)
|
|
*
|
|
* The %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctl initiates allocation of an
|
|
* isochronous channel and/or of isochronous bandwidth at the isochronous
|
|
* resource manager (IRM). Only one of the channels specified in @channels is
|
|
* allocated. An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED is sent after
|
|
* communication with the IRM, indicating success or failure in the event data.
|
|
* The kernel will automatically reallocate the resources after bus resets.
|
|
* Should a reallocation fail, an %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event
|
|
* will be sent. The kernel will also automatically deallocate the resources
|
|
* when the file descriptor is closed.
|
|
*
|
|
* The %FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE ioctl can be used to initiate
|
|
* deallocation of resources which were allocated as described above.
|
|
* An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event concludes this operation.
|
|
*
|
|
* The %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE ioctl is a variant of allocation
|
|
* without automatic re- or deallocation.
|
|
* An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event concludes this operation,
|
|
* indicating success or failure in its data.
|
|
*
|
|
* The %FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE ioctl works like
|
|
* %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE except that resources are freed
|
|
* instead of allocated.
|
|
* An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event concludes this operation.
|
|
*
|
|
* To summarize, %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE allocates iso resources
|
|
* for the lifetime of the fd or @handle.
|
|
* In contrast, %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE allocates iso resources
|
|
* for the duration of a bus generation.
|
|
*
|
|
* @channels is a host-endian bitfield with the least significant bit
|
|
* representing channel 0 and the most significant bit representing channel 63:
|
|
* 1ULL << c for each channel c that is a candidate for (de)allocation.
|
|
*
|
|
* @bandwidth is expressed in bandwidth allocation units, i.e. the time to send
|
|
* one quadlet of data (payload or header data) at speed S1600.
|
|
*/
|
|
struct fw_cdev_allocate_iso_resource {
|
|
__u64 closure;
|
|
__u64 channels;
|
|
__u32 bandwidth;
|
|
__u32 handle;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_send_stream_packet - send an asynchronous stream packet
|
|
* @length: Length of outgoing payload, in bytes
|
|
* @tag: Data format tag
|
|
* @channel: Isochronous channel to transmit to
|
|
* @sy: Synchronization code
|
|
* @closure: Passed back to userspace in the response event
|
|
* @data: Userspace pointer to payload
|
|
* @generation: The bus generation where packet is valid
|
|
* @speed: Speed to transmit at
|
|
*
|
|
* The %FW_CDEV_IOC_SEND_STREAM_PACKET ioctl sends an asynchronous stream packet
|
|
* to every device which is listening to the specified channel. The kernel
|
|
* writes an &fw_cdev_event_response event which indicates success or failure of
|
|
* the transmission.
|
|
*/
|
|
struct fw_cdev_send_stream_packet {
|
|
__u32 length;
|
|
__u32 tag;
|
|
__u32 channel;
|
|
__u32 sy;
|
|
__u64 closure;
|
|
__u64 data;
|
|
__u32 generation;
|
|
__u32 speed;
|
|
};
|
|
|
|
#endif /* _LINUX_FIREWIRE_CDEV_H */
|