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ccfe27d7 MS |
1 | /* |
2 | * Implements the generic device dma API for microblaze and the pci | |
3 | * | |
4 | * Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu> | |
5 | * Copyright (C) 2009-2010 PetaLogix | |
6 | * | |
7 | * This file is subject to the terms and conditions of the GNU General | |
8 | * Public License. See the file COPYING in the main directory of this | |
9 | * archive for more details. | |
10 | * | |
11 | * This file is base on powerpc and x86 dma-mapping.h versions | |
12 | * Copyright (C) 2004 IBM | |
13 | */ | |
14 | ||
15 | #ifndef _ASM_MICROBLAZE_DMA_MAPPING_H | |
16 | #define _ASM_MICROBLAZE_DMA_MAPPING_H | |
17 | ||
18 | /* | |
19 | * See Documentation/PCI/PCI-DMA-mapping.txt and | |
20 | * Documentation/DMA-API.txt for documentation. | |
21 | */ | |
22 | ||
23 | #include <linux/types.h> | |
24 | #include <linux/cache.h> | |
25 | #include <linux/mm.h> | |
26 | #include <linux/scatterlist.h> | |
27 | #include <linux/dma-debug.h> | |
28 | #include <linux/dma-attrs.h> | |
29 | #include <asm/io.h> | |
30 | #include <asm-generic/dma-coherent.h> | |
31 | ||
32 | #define DMA_ERROR_CODE (~(dma_addr_t)0x0) | |
33 | ||
34 | #define __dma_alloc_coherent(dev, gfp, size, handle) NULL | |
35 | #define __dma_free_coherent(size, addr) ((void)0) | |
36 | #define __dma_sync(addr, size, rw) ((void)0) | |
ccfe27d7 MS |
37 | |
38 | static inline unsigned long device_to_mask(struct device *dev) | |
39 | { | |
40 | if (dev->dma_mask && *dev->dma_mask) | |
41 | return *dev->dma_mask; | |
42 | /* Assume devices without mask can take 32 bit addresses */ | |
43 | return 0xfffffffful; | |
44 | } | |
45 | ||
46 | extern struct dma_map_ops *dma_ops; | |
47 | ||
48 | /* | |
49 | * Available generic sets of operations | |
50 | */ | |
51 | extern struct dma_map_ops dma_direct_ops; | |
52 | ||
53 | static inline struct dma_map_ops *get_dma_ops(struct device *dev) | |
54 | { | |
55 | /* We don't handle the NULL dev case for ISA for now. We could | |
56 | * do it via an out of line call but it is not needed for now. The | |
57 | * only ISA DMA device we support is the floppy and we have a hack | |
58 | * in the floppy driver directly to get a device for us. | |
59 | */ | |
60 | if (unlikely(!dev) || !dev->archdata.dma_ops) | |
61 | return NULL; | |
62 | ||
63 | return dev->archdata.dma_ops; | |
64 | } | |
65 | ||
66 | static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops) | |
67 | { | |
68 | dev->archdata.dma_ops = ops; | |
69 | } | |
70 | ||
71 | static inline int dma_supported(struct device *dev, u64 mask) | |
72 | { | |
73 | struct dma_map_ops *ops = get_dma_ops(dev); | |
74 | ||
75 | if (unlikely(!ops)) | |
76 | return 0; | |
77 | if (!ops->dma_supported) | |
78 | return 1; | |
79 | return ops->dma_supported(dev, mask); | |
80 | } | |
81 | ||
ccfe27d7 MS |
82 | static inline int dma_set_mask(struct device *dev, u64 dma_mask) |
83 | { | |
84 | struct dma_map_ops *ops = get_dma_ops(dev); | |
85 | ||
86 | if (unlikely(ops == NULL)) | |
87 | return -EIO; | |
88 | if (ops->set_dma_mask) | |
89 | return ops->set_dma_mask(dev, dma_mask); | |
90 | if (!dev->dma_mask || !dma_supported(dev, dma_mask)) | |
91 | return -EIO; | |
92 | *dev->dma_mask = dma_mask; | |
93 | return 0; | |
94 | } | |
95 | ||
96 | #include <asm-generic/dma-mapping-common.h> | |
97 | ||
98 | static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) | |
99 | { | |
100 | struct dma_map_ops *ops = get_dma_ops(dev); | |
101 | if (ops->mapping_error) | |
102 | return ops->mapping_error(dev, dma_addr); | |
103 | ||
104 | return (dma_addr == DMA_ERROR_CODE); | |
105 | } | |
106 | ||
107 | #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) | |
108 | #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) | |
ccfe27d7 MS |
109 | |
110 | static inline void *dma_alloc_coherent(struct device *dev, size_t size, | |
111 | dma_addr_t *dma_handle, gfp_t flag) | |
112 | { | |
113 | struct dma_map_ops *ops = get_dma_ops(dev); | |
114 | void *memory; | |
115 | ||
116 | BUG_ON(!ops); | |
117 | ||
118 | memory = ops->alloc_coherent(dev, size, dma_handle, flag); | |
119 | ||
120 | debug_dma_alloc_coherent(dev, size, *dma_handle, memory); | |
121 | return memory; | |
122 | } | |
123 | ||
124 | static inline void dma_free_coherent(struct device *dev, size_t size, | |
125 | void *cpu_addr, dma_addr_t dma_handle) | |
126 | { | |
127 | struct dma_map_ops *ops = get_dma_ops(dev); | |
128 | ||
129 | BUG_ON(!ops); | |
130 | debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); | |
131 | ops->free_coherent(dev, size, cpu_addr, dma_handle); | |
132 | } | |
133 | ||
ccfe27d7 MS |
134 | static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, |
135 | enum dma_data_direction direction) | |
136 | { | |
137 | BUG_ON(direction == DMA_NONE); | |
138 | __dma_sync(vaddr, size, (int)direction); | |
139 | } | |
140 | ||
141 | #endif /* _ASM_MICROBLAZE_DMA_MAPPING_H */ |