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