FreeBSD/Linux Kernel Cross Reference
sys/sys/_bus_dma.h
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
35 typedef 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 */
45 typedef struct bus_dma_tag *bus_dma_tag_t;
46
47 /*
48 * bus_dmamap_t
49 *
50 * DMA mapping instance information.
51 */
52 typedef struct bus_dmamap *bus_dmamap_t;
53
54 /*
55 * A function that performs driver-specific synchronization on behalf of
56 * busdma.
57 */
58 typedef enum {
59 BUS_DMA_LOCK = 0x01,
60 BUS_DMA_UNLOCK = 0x02,
61 } bus_dma_lock_op_t;
62
63 typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t);
64
65 #endif /* !_SYS__BUS_DMA_H_ */
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