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
42 enum 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
54 enum {
55 DMA_ATTR_NO_WARN = __BIT(0),
56 DMA_ATTR_SKIP_CPU_SYNC = __BIT(1),
57 };
58
59 static inline uintmax_t
DMA_BIT_MASK(unsigned nbits)60 DMA_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
68 static inline bool
dma_addressing_limited(device_t dev)69 dma_addressing_limited(device_t dev)
70 {
71
72 return false;
73 }
74
75 #endif /* _LINUX_DMA_MAPPING_H_ */
76