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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 | /* | |
395cf969 | 19 | * See Documentation/DMA-API-HOWTO.txt and |
ccfe27d7 MS |
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> | |
cf560c18 | 31 | #include <asm/cacheflush.h> |
ccfe27d7 MS |
32 | |
33 | #define DMA_ERROR_CODE (~(dma_addr_t)0x0) | |
34 | ||
35 | #define __dma_alloc_coherent(dev, gfp, size, handle) NULL | |
36 | #define __dma_free_coherent(size, addr) ((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 | ||
cf560c18 EB |
98 | static inline void __dma_sync(unsigned long paddr, |
99 | size_t size, enum dma_data_direction direction) | |
100 | { | |
101 | switch (direction) { | |
102 | case DMA_TO_DEVICE: | |
103 | case DMA_BIDIRECTIONAL: | |
104 | flush_dcache_range(paddr, paddr + size); | |
105 | break; | |
106 | case DMA_FROM_DEVICE: | |
107 | invalidate_dcache_range(paddr, paddr + size); | |
108 | break; | |
109 | default: | |
110 | BUG(); | |
111 | } | |
112 | } | |
113 | ||
ccfe27d7 MS |
114 | static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
115 | { | |
116 | struct dma_map_ops *ops = get_dma_ops(dev); | |
117 | if (ops->mapping_error) | |
118 | return ops->mapping_error(dev, dma_addr); | |
119 | ||
120 | return (dma_addr == DMA_ERROR_CODE); | |
121 | } | |
122 | ||
123 | #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) | |
124 | #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) | |
ccfe27d7 | 125 | |
988624ec AP |
126 | #define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL) |
127 | ||
128 | static inline void *dma_alloc_attrs(struct device *dev, size_t size, | |
129 | dma_addr_t *dma_handle, gfp_t flag, | |
130 | struct dma_attrs *attrs) | |
ccfe27d7 MS |
131 | { |
132 | struct dma_map_ops *ops = get_dma_ops(dev); | |
133 | void *memory; | |
134 | ||
135 | BUG_ON(!ops); | |
136 | ||
988624ec | 137 | memory = ops->alloc(dev, size, dma_handle, flag, attrs); |
ccfe27d7 MS |
138 | |
139 | debug_dma_alloc_coherent(dev, size, *dma_handle, memory); | |
140 | return memory; | |
141 | } | |
142 | ||
988624ec AP |
143 | #define dma_free_coherent(d,s,c,h) dma_free_attrs(d, s, c, h, NULL) |
144 | ||
145 | static inline void dma_free_attrs(struct device *dev, size_t size, | |
146 | void *cpu_addr, dma_addr_t dma_handle, | |
147 | struct dma_attrs *attrs) | |
ccfe27d7 MS |
148 | { |
149 | struct dma_map_ops *ops = get_dma_ops(dev); | |
150 | ||
151 | BUG_ON(!ops); | |
152 | debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); | |
988624ec | 153 | ops->free(dev, size, cpu_addr, dma_handle, attrs); |
ccfe27d7 MS |
154 | } |
155 | ||
ccfe27d7 MS |
156 | static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, |
157 | enum dma_data_direction direction) | |
158 | { | |
159 | BUG_ON(direction == DMA_NONE); | |
cf560c18 | 160 | __dma_sync(virt_to_phys(vaddr), size, (int)direction); |
ccfe27d7 MS |
161 | } |
162 | ||
163 | #endif /* _ASM_MICROBLAZE_DMA_MAPPING_H */ |