640 строки
25 KiB
C
640 строки
25 KiB
C
/*
|
|
* Char device interface.
|
|
*
|
|
* Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#ifndef _LINUX_FIREWIRE_CDEV_H
|
|
#define _LINUX_FIREWIRE_CDEV_H
|
|
|
|
#include <linux/ioctl.h>
|
|
#include <linux/types.h>
|
|
#include <linux/firewire-constants.h>
|
|
|
|
#define FW_CDEV_EVENT_BUS_RESET 0x00
|
|
#define FW_CDEV_EVENT_RESPONSE 0x01
|
|
#define FW_CDEV_EVENT_REQUEST 0x02
|
|
#define FW_CDEV_EVENT_ISO_INTERRUPT 0x03
|
|
#define FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED 0x04
|
|
#define FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED 0x05
|
|
|
|
/**
|
|
* struct fw_cdev_event_common - Common part of all fw_cdev_event_ types
|
|
* @closure: For arbitrary use by userspace
|
|
* @type: Discriminates the fw_cdev_event_ types
|
|
*
|
|
* This struct may be used to access generic members of all fw_cdev_event_
|
|
* types regardless of the specific type.
|
|
*
|
|
* Data passed in the @closure field for a request will be returned in the
|
|
* corresponding event. It is big enough to hold a pointer on all platforms.
|
|
* The ioctl used to set @closure depends on the @type of event.
|
|
*/
|
|
struct fw_cdev_event_common {
|
|
__u64 closure;
|
|
__u32 type;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_event_bus_reset - Sent when a bus reset occurred
|
|
* @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_GET_INFO ioctl
|
|
* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_BUS_RESET
|
|
* @node_id: New node ID of this node
|
|
* @local_node_id: Node ID of the local node, i.e. of the controller
|
|
* @bm_node_id: Node ID of the bus manager
|
|
* @irm_node_id: Node ID of the iso resource manager
|
|
* @root_node_id: Node ID of the root node
|
|
* @generation: New bus generation
|
|
*
|
|
* This event is sent when the bus the device belongs to goes through a bus
|
|
* reset. It provides information about the new bus configuration, such as
|
|
* new node ID for this device, new root ID, and others.
|
|
*/
|
|
struct fw_cdev_event_bus_reset {
|
|
__u64 closure;
|
|
__u32 type;
|
|
__u32 node_id;
|
|
__u32 local_node_id;
|
|
__u32 bm_node_id;
|
|
__u32 irm_node_id;
|
|
__u32 root_node_id;
|
|
__u32 generation;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_event_response - Sent when a response packet was received
|
|
* @closure: See &fw_cdev_event_common;
|
|
* set by %FW_CDEV_IOC_SEND_REQUEST ioctl
|
|
* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_RESPONSE
|
|
* @rcode: Response code returned by the remote node
|
|
* @length: Data length, i.e. the response's payload size in bytes
|
|
* @data: Payload data, if any
|
|
*
|
|
* This event is sent when the stack receives a response to an outgoing request
|
|
* sent by %FW_CDEV_IOC_SEND_REQUEST ioctl. The payload data for responses
|
|
* carrying data (read and lock responses) follows immediately and can be
|
|
* accessed through the @data field.
|
|
*/
|
|
struct fw_cdev_event_response {
|
|
__u64 closure;
|
|
__u32 type;
|
|
__u32 rcode;
|
|
__u32 length;
|
|
__u32 data[0];
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_event_request - Sent on incoming request to an address region
|
|
* @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_ALLOCATE ioctl
|
|
* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_REQUEST
|
|
* @tcode: Transaction code of the incoming request
|
|
* @offset: The offset into the 48-bit per-node address space
|
|
* @handle: Reference to the kernel-side pending request
|
|
* @length: Data length, i.e. the request's payload size in bytes
|
|
* @data: Incoming data, if any
|
|
*
|
|
* This event is sent when the stack receives an incoming request to an address
|
|
* region registered using the %FW_CDEV_IOC_ALLOCATE ioctl. The request is
|
|
* guaranteed to be completely contained in the specified region. Userspace is
|
|
* responsible for sending the response by %FW_CDEV_IOC_SEND_RESPONSE ioctl,
|
|
* using the same @handle.
|
|
*
|
|
* The payload data for requests carrying data (write and lock requests)
|
|
* follows immediately and can be accessed through the @data field.
|
|
*/
|
|
struct fw_cdev_event_request {
|
|
__u64 closure;
|
|
__u32 type;
|
|
__u32 tcode;
|
|
__u64 offset;
|
|
__u32 handle;
|
|
__u32 length;
|
|
__u32 data[0];
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_event_iso_interrupt - Sent when an iso packet was completed
|
|
* @closure: See &fw_cdev_event_common;
|
|
* set by %FW_CDEV_CREATE_ISO_CONTEXT ioctl
|
|
* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_ISO_INTERRUPT
|
|
* @cycle: Cycle counter of the interrupt packet
|
|
* @header_length: Total length of following headers, in bytes
|
|
* @header: Stripped headers, if any
|
|
*
|
|
* This event is sent when the controller has completed an &fw_cdev_iso_packet
|
|
* with the %FW_CDEV_ISO_INTERRUPT bit set. In the receive case, the headers
|
|
* stripped of all packets up until and including the interrupt packet are
|
|
* returned in the @header field. The amount of header data per packet is as
|
|
* specified at iso context creation by &fw_cdev_create_iso_context.header_size.
|
|
*
|
|
* In version 1 of this ABI, header data consisted of the 1394 isochronous
|
|
* packet header, followed by quadlets from the packet payload if
|
|
* &fw_cdev_create_iso_context.header_size > 4.
|
|
*
|
|
* In version 2 of this ABI, header data consist of the 1394 isochronous
|
|
* packet header, followed by a timestamp quadlet if
|
|
* &fw_cdev_create_iso_context.header_size > 4, followed by quadlets from the
|
|
* packet payload if &fw_cdev_create_iso_context.header_size > 8.
|
|
*
|
|
* Behaviour of ver. 1 of this ABI is no longer available since ABI ver. 2.
|
|
*
|
|
* Format of 1394 iso packet header: 16 bits len, 2 bits tag, 6 bits channel,
|
|
* 4 bits tcode, 4 bits sy, in big endian byte order. Format of timestamp:
|
|
* 16 bits invalid, 3 bits cycleSeconds, 13 bits cycleCount, in big endian byte
|
|
* order.
|
|
*/
|
|
struct fw_cdev_event_iso_interrupt {
|
|
__u64 closure;
|
|
__u32 type;
|
|
__u32 cycle;
|
|
__u32 header_length;
|
|
__u32 header[0];
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_event_iso_resource - Iso resources were allocated or freed
|
|
* @closure: See &fw_cdev_event_common;
|
|
* set by %FW_CDEV_IOC_(DE)ALLOCATE_ISO_RESOURCE(_ONCE) ioctl
|
|
* @type: %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
|
|
* %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
|
|
* @handle: Reference by which an allocated resource can be deallocated
|
|
* @channel: Isochronous channel which was (de)allocated, if any
|
|
* @bandwidth: Bandwidth allocation units which were (de)allocated, if any
|
|
*
|
|
* An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event is sent after an isochronous
|
|
* resource was allocated at the IRM. The client has to check @channel and
|
|
* @bandwidth for whether the allocation actually succeeded.
|
|
*
|
|
* An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event is sent after an isochronous
|
|
* resource was deallocated at the IRM. It is also sent when automatic
|
|
* reallocation after a bus reset failed.
|
|
*
|
|
* @channel is <0 if no channel was (de)allocated or if reallocation failed.
|
|
* @bandwidth is 0 if no bandwidth was (de)allocated or if reallocation failed.
|
|
*/
|
|
struct fw_cdev_event_iso_resource {
|
|
__u64 closure;
|
|
__u32 type;
|
|
__u32 handle;
|
|
__s32 channel;
|
|
__s32 bandwidth;
|
|
};
|
|
|
|
/**
|
|
* union fw_cdev_event - Convenience union of fw_cdev_event_ types
|
|
* @common: Valid for all types
|
|
* @bus_reset: Valid if @common.type == %FW_CDEV_EVENT_BUS_RESET
|
|
* @response: Valid if @common.type == %FW_CDEV_EVENT_RESPONSE
|
|
* @request: Valid if @common.type == %FW_CDEV_EVENT_REQUEST
|
|
* @iso_interrupt: Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT
|
|
* @iso_resource: Valid if @common.type ==
|
|
* %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
|
|
* %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
|
|
*
|
|
* Convenience union for userspace use. Events could be read(2) into an
|
|
* appropriately aligned char buffer and then cast to this union for further
|
|
* processing. Note that for a request, response or iso_interrupt event,
|
|
* the data[] or header[] may make the size of the full event larger than
|
|
* sizeof(union fw_cdev_event). Also note that if you attempt to read(2)
|
|
* an event into a buffer that is not large enough for it, the data that does
|
|
* not fit will be discarded so that the next read(2) will return a new event.
|
|
*/
|
|
union fw_cdev_event {
|
|
struct fw_cdev_event_common common;
|
|
struct fw_cdev_event_bus_reset bus_reset;
|
|
struct fw_cdev_event_response response;
|
|
struct fw_cdev_event_request request;
|
|
struct fw_cdev_event_iso_interrupt iso_interrupt;
|
|
struct fw_cdev_event_iso_resource iso_resource;
|
|
};
|
|
|
|
/* available since kernel version 2.6.22 */
|
|
#define FW_CDEV_IOC_GET_INFO _IOWR('#', 0x00, struct fw_cdev_get_info)
|
|
#define FW_CDEV_IOC_SEND_REQUEST _IOW('#', 0x01, struct fw_cdev_send_request)
|
|
#define FW_CDEV_IOC_ALLOCATE _IOWR('#', 0x02, struct fw_cdev_allocate)
|
|
#define FW_CDEV_IOC_DEALLOCATE _IOW('#', 0x03, struct fw_cdev_deallocate)
|
|
#define FW_CDEV_IOC_SEND_RESPONSE _IOW('#', 0x04, struct fw_cdev_send_response)
|
|
#define FW_CDEV_IOC_INITIATE_BUS_RESET _IOW('#', 0x05, struct fw_cdev_initiate_bus_reset)
|
|
#define FW_CDEV_IOC_ADD_DESCRIPTOR _IOWR('#', 0x06, struct fw_cdev_add_descriptor)
|
|
#define FW_CDEV_IOC_REMOVE_DESCRIPTOR _IOW('#', 0x07, struct fw_cdev_remove_descriptor)
|
|
#define FW_CDEV_IOC_CREATE_ISO_CONTEXT _IOWR('#', 0x08, struct fw_cdev_create_iso_context)
|
|
#define FW_CDEV_IOC_QUEUE_ISO _IOWR('#', 0x09, struct fw_cdev_queue_iso)
|
|
#define FW_CDEV_IOC_START_ISO _IOW('#', 0x0a, struct fw_cdev_start_iso)
|
|
#define FW_CDEV_IOC_STOP_ISO _IOW('#', 0x0b, struct fw_cdev_stop_iso)
|
|
|
|
/* available since kernel version 2.6.24 */
|
|
#define FW_CDEV_IOC_GET_CYCLE_TIMER _IOR('#', 0x0c, struct fw_cdev_get_cycle_timer)
|
|
|
|
/* available since kernel version 2.6.30 */
|
|
#define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE _IOWR('#', 0x0d, struct fw_cdev_allocate_iso_resource)
|
|
#define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE _IOW('#', 0x0e, struct fw_cdev_deallocate)
|
|
#define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x0f, struct fw_cdev_allocate_iso_resource)
|
|
#define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x10, struct fw_cdev_allocate_iso_resource)
|
|
#define FW_CDEV_IOC_GET_SPEED _IO('#', 0x11) /* returns speed code */
|
|
#define FW_CDEV_IOC_SEND_BROADCAST_REQUEST _IOW('#', 0x12, struct fw_cdev_send_request)
|
|
#define FW_CDEV_IOC_SEND_STREAM_PACKET _IOW('#', 0x13, struct fw_cdev_send_stream_packet)
|
|
|
|
/*
|
|
* FW_CDEV_VERSION History
|
|
* 1 (2.6.22) - initial version
|
|
* 2 (2.6.30) - changed &fw_cdev_event_iso_interrupt.header if
|
|
* &fw_cdev_create_iso_context.header_size is 8 or more
|
|
*/
|
|
#define FW_CDEV_VERSION 2
|
|
|
|
/**
|
|
* struct fw_cdev_get_info - General purpose information ioctl
|
|
* @version: The version field is just a running serial number.
|
|
* We never break backwards compatibility, but may add more
|
|
* structs and ioctls in later revisions.
|
|
* @rom_length: If @rom is non-zero, at most rom_length bytes of configuration
|
|
* ROM will be copied into that user space address. In either
|
|
* case, @rom_length is updated with the actual length of the
|
|
* configuration ROM.
|
|
* @rom: If non-zero, address of a buffer to be filled by a copy of the
|
|
* device's configuration ROM
|
|
* @bus_reset: If non-zero, address of a buffer to be filled by a
|
|
* &struct fw_cdev_event_bus_reset with the current state
|
|
* of the bus. This does not cause a bus reset to happen.
|
|
* @bus_reset_closure: Value of &closure in this and subsequent bus reset events
|
|
* @card: The index of the card this device belongs to
|
|
*/
|
|
struct fw_cdev_get_info {
|
|
__u32 version;
|
|
__u32 rom_length;
|
|
__u64 rom;
|
|
__u64 bus_reset;
|
|
__u64 bus_reset_closure;
|
|
__u32 card;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_send_request - Send an asynchronous request packet
|
|
* @tcode: Transaction code of the request
|
|
* @length: Length of outgoing payload, in bytes
|
|
* @offset: 48-bit offset at destination node
|
|
* @closure: Passed back to userspace in the response event
|
|
* @data: Userspace pointer to payload
|
|
* @generation: The bus generation where packet is valid
|
|
*
|
|
* Send a request to the device. This ioctl implements all outgoing requests.
|
|
* Both quadlet and block request specify the payload as a pointer to the data
|
|
* in the @data field. Once the transaction completes, the kernel writes an
|
|
* &fw_cdev_event_response event back. The @closure field is passed back to
|
|
* user space in the response event.
|
|
*/
|
|
struct fw_cdev_send_request {
|
|
__u32 tcode;
|
|
__u32 length;
|
|
__u64 offset;
|
|
__u64 closure;
|
|
__u64 data;
|
|
__u32 generation;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_send_response - Send an asynchronous response packet
|
|
* @rcode: Response code as determined by the userspace handler
|
|
* @length: Length of outgoing payload, in bytes
|
|
* @data: Userspace pointer to payload
|
|
* @handle: The handle from the &fw_cdev_event_request
|
|
*
|
|
* Send a response to an incoming request. By setting up an address range using
|
|
* the %FW_CDEV_IOC_ALLOCATE ioctl, userspace can listen for incoming requests. An
|
|
* incoming request will generate an %FW_CDEV_EVENT_REQUEST, and userspace must
|
|
* send a reply using this ioctl. The event has a handle to the kernel-side
|
|
* pending transaction, which should be used with this ioctl.
|
|
*/
|
|
struct fw_cdev_send_response {
|
|
__u32 rcode;
|
|
__u32 length;
|
|
__u64 data;
|
|
__u32 handle;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_allocate - Allocate a CSR address range
|
|
* @offset: Start offset of the address range
|
|
* @closure: To be passed back to userspace in request events
|
|
* @length: Length of the address range, in bytes
|
|
* @handle: Handle to the allocation, written by the kernel
|
|
*
|
|
* Allocate an address range in the 48-bit address space on the local node
|
|
* (the controller). This allows userspace to listen for requests with an
|
|
* offset within that address range. When the kernel receives a request
|
|
* within the range, an &fw_cdev_event_request event will be written back.
|
|
* The @closure field is passed back to userspace in the response event.
|
|
* The @handle field is an out parameter, returning a handle to the allocated
|
|
* range to be used for later deallocation of the range.
|
|
*
|
|
* The address range is allocated on all local nodes. The address allocation
|
|
* is exclusive except for the FCP command and response registers.
|
|
*/
|
|
struct fw_cdev_allocate {
|
|
__u64 offset;
|
|
__u64 closure;
|
|
__u32 length;
|
|
__u32 handle;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_deallocate - Free a CSR address range or isochronous resource
|
|
* @handle: Handle to the address range or iso resource, as returned by the
|
|
* kernel when the range or resource was allocated
|
|
*/
|
|
struct fw_cdev_deallocate {
|
|
__u32 handle;
|
|
};
|
|
|
|
#define FW_CDEV_LONG_RESET 0
|
|
#define FW_CDEV_SHORT_RESET 1
|
|
|
|
/**
|
|
* struct fw_cdev_initiate_bus_reset - Initiate a bus reset
|
|
* @type: %FW_CDEV_SHORT_RESET or %FW_CDEV_LONG_RESET
|
|
*
|
|
* Initiate a bus reset for the bus this device is on. The bus reset can be
|
|
* either the original (long) bus reset or the arbitrated (short) bus reset
|
|
* introduced in 1394a-2000.
|
|
*/
|
|
struct fw_cdev_initiate_bus_reset {
|
|
__u32 type; /* FW_CDEV_SHORT_RESET or FW_CDEV_LONG_RESET */
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_add_descriptor - Add contents to the local node's config ROM
|
|
* @immediate: If non-zero, immediate key to insert before pointer
|
|
* @key: Upper 8 bits of root directory pointer
|
|
* @data: Userspace pointer to contents of descriptor block
|
|
* @length: Length of descriptor block data, in quadlets
|
|
* @handle: Handle to the descriptor, written by the kernel
|
|
*
|
|
* Add a descriptor block and optionally a preceding immediate key to the local
|
|
* node's configuration ROM.
|
|
*
|
|
* The @key field specifies the upper 8 bits of the descriptor root directory
|
|
* pointer and the @data and @length fields specify the contents. The @key
|
|
* should be of the form 0xXX000000. The offset part of the root directory entry
|
|
* will be filled in by the kernel.
|
|
*
|
|
* If not 0, the @immediate field specifies an immediate key which will be
|
|
* inserted before the root directory pointer.
|
|
*
|
|
* @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 to transmit at
|
|
* @closure: To be returned in &fw_cdev_event_iso_interrupt
|
|
* @handle: Handle to context, written back by kernel
|
|
*
|
|
* Prior to sending or receiving isochronous I/O, a context must be created.
|
|
* The context records information about the transmit or receive configuration
|
|
* and typically maps to an underlying hardware resource. A context is set up
|
|
* for either sending or receiving. It is bound to a specific isochronous
|
|
* channel.
|
|
*
|
|
* If a context was successfully created, the kernel writes back a handle to the
|
|
* context, which must be passed in for subsequent operations on that context.
|
|
*
|
|
* 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. The sy and tag fields are
|
|
* specified by IEEE 1394a and IEC 61883.
|
|
*
|
|
* FIXME - finish this documentation
|
|
*/
|
|
struct fw_cdev_iso_packet {
|
|
__u32 control;
|
|
__u32 header[0];
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_queue_iso - Queue isochronous packets for I/O
|
|
* @packets: Userspace pointer to packet data
|
|
* @data: Pointer into mmap()'ed payload buffer
|
|
* @size: Size of packet data in bytes
|
|
* @handle: Isochronous context handle
|
|
*
|
|
* Queue a number of isochronous packets for reception or transmission.
|
|
* This ioctl takes a pointer to an array of &fw_cdev_iso_packet structs,
|
|
* which describe how to transmit from or receive into a contiguous region
|
|
* of a mmap()'ed payload buffer. As part of the packet descriptors,
|
|
* a series of headers can be supplied, which will be prepended to the
|
|
* payload during DMA.
|
|
*
|
|
* The kernel may or may not queue all packets, but will write back updated
|
|
* values of the @packets, @data and @size fields, so the ioctl can be
|
|
* resubmitted easily.
|
|
*/
|
|
struct fw_cdev_queue_iso {
|
|
__u64 packets;
|
|
__u64 data;
|
|
__u32 size;
|
|
__u32 handle;
|
|
};
|
|
|
|
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG0 1
|
|
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG1 2
|
|
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG2 4
|
|
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG3 8
|
|
#define FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS 15
|
|
|
|
/**
|
|
* struct fw_cdev_start_iso - Start an isochronous transmission or reception
|
|
* @cycle: Cycle in which to start I/O. If @cycle is greater than or
|
|
* equal to 0, the I/O will start on that cycle.
|
|
* @sync: Determines the value to wait for for receive packets that have
|
|
* the %FW_CDEV_ISO_SYNC bit set
|
|
* @tags: Tag filter bit mask. Only valid for isochronous reception.
|
|
* Determines the tag values for which packets will be accepted.
|
|
* Use FW_CDEV_ISO_CONTEXT_MATCH_ macros to set @tags.
|
|
* @handle: Isochronous context handle within which to transmit or receive
|
|
*/
|
|
struct fw_cdev_start_iso {
|
|
__s32 cycle;
|
|
__u32 sync;
|
|
__u32 tags;
|
|
__u32 handle;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_stop_iso - Stop an isochronous transmission or reception
|
|
* @handle: Handle of isochronous context to stop
|
|
*/
|
|
struct fw_cdev_stop_iso {
|
|
__u32 handle;
|
|
};
|
|
|
|
/**
|
|
* struct fw_cdev_get_cycle_timer - read cycle timer register
|
|
* @local_time: system time, in microseconds since the Epoch
|
|
* @cycle_timer: isochronous cycle timer, as per OHCI 1.1 clause 5.13
|
|
*
|
|
* The %FW_CDEV_IOC_GET_CYCLE_TIMER ioctl reads the isochronous cycle timer
|
|
* and also the system clock. This allows to express the receive time of an
|
|
* isochronous packet as a system time with microsecond accuracy.
|
|
*
|
|
* @cycle_timer consists of 7 bits cycleSeconds, 13 bits cycleCount, and
|
|
* 12 bits cycleOffset, in host byte order.
|
|
*/
|
|
struct fw_cdev_get_cycle_timer {
|
|
__u64 local_time;
|
|
__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_DEALLOCATE_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 */
|