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review.shift-gmbh.com / SHIFTPHONES / kernel / shift / mainline / c4e5a0232763db22d6c60c391ed5816b2b2ac063 / . / arch / openrisc / include / asm / dma-mapping.h
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Jonas Bonna39af6f2011-06-04 21:56:48 +0300[diff] [blame]1/*
2 * OpenRISC Linux
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * OpenRISC implementation:
9 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 */
16
17#ifndef __ASM_OPENRISC_DMA_MAPPING_H
18#define __ASM_OPENRISC_DMA_MAPPING_H
19
20/*
21 * See Documentation/PCI/PCI-DMA-mapping.txt and
22 * Documentation/DMA-API.txt for documentation.
23 *
24 * This file is written with the intention of eventually moving over
25 * to largely using asm-generic/dma-mapping-common.h in its place.
26 */
27
28#include <linux/dma-debug.h>
29#include <asm-generic/dma-coherent.h>
30#include <linux/kmemcheck.h>
31
32#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
33
34int dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
35
36#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
37#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
38
39void *or1k_dma_alloc_coherent(struct device *dev, size_t size,
40 dma_addr_t *dma_handle, gfp_t flag);
41void or1k_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
42 dma_addr_t dma_handle);
43dma_addr_t or1k_map_page(struct device *dev, struct page *page,
44 unsigned long offset, size_t size,
45 enum dma_data_direction dir,
46 struct dma_attrs *attrs);
47void or1k_unmap_page(struct device *dev, dma_addr_t dma_handle,
48 size_t size, enum dma_data_direction dir,
49 struct dma_attrs *attrs);
50void or1k_sync_single_for_cpu(struct device *dev,
51 dma_addr_t dma_handle, size_t size,
52 enum dma_data_direction dir);
53void or1k_sync_single_for_device(struct device *dev,
54 dma_addr_t dma_handle, size_t size,
55 enum dma_data_direction dir);
56
57static inline void *dma_alloc_coherent(struct device *dev, size_t size,
58 dma_addr_t *dma_handle, gfp_t flag)
59{
60 void *memory;
61
62 memory = or1k_dma_alloc_coherent(dev, size, dma_handle, flag);
63
64 debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
65 return memory;
66}
67
68static inline void dma_free_coherent(struct device *dev, size_t size,
69 void *cpu_addr, dma_addr_t dma_handle)
70{
71 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
72 or1k_dma_free_coherent(dev, size, cpu_addr, dma_handle);
73}
74
75static inline dma_addr_t dma_map_single(struct device *dev, void *ptr,
76 size_t size,
77 enum dma_data_direction dir)
78{
79 dma_addr_t addr;
80
81 kmemcheck_mark_initialized(ptr, size);
82 BUG_ON(!valid_dma_direction(dir));
83 addr = or1k_map_page(dev, virt_to_page(ptr),
84 (unsigned long)ptr & ~PAGE_MASK, size,
85 dir, NULL);
86 debug_dma_map_page(dev, virt_to_page(ptr),
87 (unsigned long)ptr & ~PAGE_MASK, size,
88 dir, addr, true);
89 return addr;
90}
91
92static inline void dma_unmap_single(struct device *dev, dma_addr_t addr,
93 size_t size,
94 enum dma_data_direction dir)
95{
96 BUG_ON(!valid_dma_direction(dir));
97 or1k_unmap_page(dev, addr, size, dir, NULL);
98 debug_dma_unmap_page(dev, addr, size, dir, true);
99}
100
101static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
102 size_t size,
103 enum dma_data_direction dir)
104{
105 BUG_ON(!valid_dma_direction(dir));
106 or1k_sync_single_for_cpu(dev, addr, size, dir);
107 debug_dma_sync_single_for_cpu(dev, addr, size, dir);
108}
109
110static inline void dma_sync_single_for_device(struct device *dev,
111 dma_addr_t addr, size_t size,
112 enum dma_data_direction dir)
113{
114 BUG_ON(!valid_dma_direction(dir));
115 or1k_sync_single_for_device(dev, addr, size, dir);
116 debug_dma_sync_single_for_device(dev, addr, size, dir);
117}
118
119static inline int dma_supported(struct device *dev, u64 dma_mask)
120{
121 /* Support 32 bit DMA mask exclusively */
122 return dma_mask == 0xffffffffULL;
123}
124
125static inline int dma_set_mask(struct device *dev, u64 dma_mask)
126{
127 if (!dev->dma_mask || !dma_supported(dev, dma_mask))
128 return -EIO;
129
130 *dev->dma_mask = dma_mask;
131
132 return 0;
133}
134#endif /* __ASM_OPENRISC_DMA_MAPPING_H */