1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright 2006 John-Mark Gurney.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 *
30 */
31
32#ifndef _SYS__BUS_DMA_H_
33#define _SYS__BUS_DMA_H_
34
35typedef int bus_dmasync_op_t;
36
37/*
38 *	bus_dma_tag_t
39 *
40 *	A machine-dependent opaque type describing the characteristics
41 *	of how to perform DMA mappings.  This structure encapsultes
42 *	information concerning address and alignment restrictions, number
43 *	of S/G segments, amount of data per S/G segment, etc.
44 */
45typedef struct bus_dma_tag	*bus_dma_tag_t;
46
47/*
48 *	bus_dmamap_t
49 *
50 *	DMA mapping instance information.
51 */
52typedef struct bus_dmamap	*bus_dmamap_t;
53
54/*
55 * A function that performs driver-specific synchronization on behalf of
56 * busdma.
57 */
58typedef enum {
59	BUS_DMA_LOCK	= 0x01,
60	BUS_DMA_UNLOCK	= 0x02,
61} bus_dma_lock_op_t;
62
63typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t);
64
65#endif /* !_SYS__BUS_DMA_H_ */
66