FreeBSD/Linux Kernel Cross Reference
sys/sys/_bus_dma.h
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: src/sys/sys/_bus_dma.h,v 1.1 2006/09/03 00:26:17 jmg Exp $
27 *
28 */
29
30 #ifndef _SYS__BUS_DMA_H_
31 #define _SYS__BUS_DMA_H_
32
33 typedef 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 */
43 typedef struct bus_dma_tag *bus_dma_tag_t;
44
45 /*
46 * bus_dmamap_t
47 *
48 * DMA mapping instance information.
49 */
50 typedef struct bus_dmamap *bus_dmamap_t;
51
52 /*
53 * A function that performs driver-specific synchronization on behalf of
54 * busdma.
55 */
56 typedef enum {
57 BUS_DMA_LOCK = 0x01,
58 BUS_DMA_UNLOCK = 0x02,
59 } bus_dma_lock_op_t;
60
61 typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t);
62
63 #endif /* !_SYS__BUS_DMA_H_ */
64
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