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/*

 * 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

/**

 * 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.

 */

struct fw_cdev_event_iso_interrupt {

        __u64 closure;

        __u32 type;

        __u32 cycle;

        __u32 header_length;

        __u32 header[0];

};

/**

 * 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

 *

 * Convenience union for userspace use.  Events could be read(2) into a char

 * buffer and then cast to this union for further processing.

 */

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;

};

#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)

#define FW_CDEV_IOC_GET_CYCLE_TIMER     _IOR('#', 0x0c, struct fw_cdev_get_cycle_timer)

/* FW_CDEV_VERSION History

 *

 * 1    Feb 18, 2007:  Initial version.

 */

#define FW_CDEV_VERSION         1

/**

 * 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

 *              local node'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_request 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.

 */

struct fw_cdev_allocate {

        __u64 offset;

        __u64 closure;

        __u32 length;

        __u32 handle;

};

/**

 * struct fw_cdev_deallocate - Free an address range allocation

 * @handle:     Handle to the address range, as returned by the kernel when the

 *              range 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 bytes

 * @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.

 *

 * 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.

 */

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

 * node's configuration ROM.

 */

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.

 */

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.

 */

struct fw_cdev_get_cycle_timer {

        __u64 local_time;

        __u32 cycle_timer;

};

#endif /* _LINUX_FIREWIRE_CDEV_H */