tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 */
14
15#ifndef _ASM_TILE_DMA_MAPPING_H
16#define _ASM_TILE_DMA_MAPPING_H
17
18#include <linux/mm.h>
19#include <linux/scatterlist.h>
20#include <linux/cache.h>
21#include <linux/io.h>
22
23/*
24 * Note that on x86 and powerpc, there is a "struct dma_mapping_ops"
25 * that is used for all the DMA operations. For now, we don't have an
26 * equivalent on tile, because we only have a single way of doing DMA.
27 * (Tilera bug 7994 to use dma_mapping_ops.)
28 */
29
30#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
31#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
32
33extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
34 enum dma_data_direction);
35extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
36 size_t size, enum dma_data_direction);
37extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
38 enum dma_data_direction);
39extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
40 int nhwentries, enum dma_data_direction);
41extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
42 unsigned long offset, size_t size,
43 enum dma_data_direction);
44extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
45 size_t size, enum dma_data_direction);
46extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
47 int nelems, enum dma_data_direction);
48extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
49 int nelems, enum dma_data_direction);
50
51
52void *dma_alloc_coherent(struct device *dev, size_t size,
53 dma_addr_t *dma_handle, gfp_t flag);
54
55void dma_free_coherent(struct device *dev, size_t size,
56 void *vaddr, dma_addr_t dma_handle);
57
58extern void dma_sync_single_for_cpu(struct device *, dma_addr_t, size_t,
59 enum dma_data_direction);
60extern void dma_sync_single_for_device(struct device *, dma_addr_t,
61 size_t, enum dma_data_direction);
62extern void dma_sync_single_range_for_cpu(struct device *, dma_addr_t,
63 unsigned long offset, size_t,
64 enum dma_data_direction);
65extern void dma_sync_single_range_for_device(struct device *, dma_addr_t,
66 unsigned long offset, size_t,
67 enum dma_data_direction);
68extern void dma_cache_sync(struct device *dev, void *vaddr, size_t,
69 enum dma_data_direction);
70
71static inline int
72dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
73{
74 return 0;
75}
76
77static inline int
78dma_supported(struct device *dev, u64 mask)
79{
80 return 1;
81}
82
83static inline int
84dma_set_mask(struct device *dev, u64 mask)
85{
86 if (!dev->dma_mask || !dma_supported(dev, mask))
87 return -EIO;
88
89 *dev->dma_mask = mask;
90
91 return 0;
92}
93
94#endif /* _ASM_TILE_DMA_MAPPING_H */