1/*	$NetBSD: dma-mapping.h,v 1.10 2021/12/19 12:21:30 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _LINUX_DMA_MAPPING_H_
33#define _LINUX_DMA_MAPPING_H_
34
35#include <sys/param.h>
36#include <sys/bus.h>
37
38#include <machine/limits.h>
39
40#include <linux/types.h>
41
42enum dma_data_direction {
43	DMA_NONE		= 0,
44	DMA_TO_DEVICE		= 1,
45	DMA_FROM_DEVICE		= 2,
46	DMA_BIDIRECTIONAL	= 3,
47
48	PCI_DMA_NONE		= DMA_NONE,
49	PCI_TO_DEVICE		= DMA_TO_DEVICE,
50	PCI_FROM_DEVICE		= DMA_FROM_DEVICE,
51	PCI_DMA_BIDIRECTIONAL	= DMA_BIDIRECTIONAL,
52};
53
54enum {
55	DMA_ATTR_NO_WARN	= __BIT(0),
56	DMA_ATTR_SKIP_CPU_SYNC	= __BIT(1),
57};
58
59static inline uintmax_t
60DMA_BIT_MASK(unsigned nbits)
61{
62
63	if (nbits == CHAR_BIT*sizeof(uintmax_t))
64		return ~(uintmax_t)0;
65	return ~(~(uintmax_t)0 << nbits);
66}
67
68static inline bool
69dma_addressing_limited(device_t dev)
70{
71
72	return false;
73}
74
75#endif  /* _LINUX_DMA_MAPPING_H_ */
76