fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-xtensa / dma-mapping.h
blob82b03b3a2ee6a4103726e69006319ba84158fb1e
1 /*
2 * include/asm-xtensa/dma-mapping.h
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
8 * Copyright (C) 2003 - 2005 Tensilica Inc.
9 */
11 #ifndef _XTENSA_DMA_MAPPING_H
12 #define _XTENSA_DMA_MAPPING_H
14 #include <asm/scatterlist.h>
15 #include <asm/cache.h>
16 #include <asm/io.h>
17 #include <linux/mm.h>
20 * DMA-consistent mapping functions.
23 extern void *consistent_alloc(int, size_t, dma_addr_t, unsigned long);
24 extern void consistent_free(void*, size_t, dma_addr_t);
25 extern void consistent_sync(void*, size_t, int);
27 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
28 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
30 void *dma_alloc_coherent(struct device *dev, size_t size,
31 dma_addr_t *dma_handle, gfp_t flag);
33 void dma_free_coherent(struct device *dev, size_t size,
34 void *vaddr, dma_addr_t dma_handle);
36 static inline dma_addr_t
37 dma_map_single(struct device *dev, void *ptr, size_t size,
38 enum dma_data_direction direction)
40 BUG_ON(direction == DMA_NONE);
41 consistent_sync(ptr, size, direction);
42 return virt_to_phys(ptr);
45 static inline void
46 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
47 enum dma_data_direction direction)
49 BUG_ON(direction == DMA_NONE);
52 static inline int
53 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
54 enum dma_data_direction direction)
56 int i;
58 BUG_ON(direction == DMA_NONE);
60 for (i = 0; i < nents; i++, sg++ ) {
61 BUG_ON(!sg->page);
63 sg->dma_address = page_to_phys(sg->page) + sg->offset;
64 consistent_sync(page_address(sg->page) + sg->offset,
65 sg->length, direction);
68 return nents;
71 static inline dma_addr_t
72 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
73 size_t size, enum dma_data_direction direction)
75 BUG_ON(direction == DMA_NONE);
76 return (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + offset;
79 static inline void
80 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
81 enum dma_data_direction direction)
83 BUG_ON(direction == DMA_NONE);
87 static inline void
88 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
89 enum dma_data_direction direction)
91 BUG_ON(direction == DMA_NONE);
94 static inline void
95 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
96 enum dma_data_direction direction)
98 consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
101 static inline void
102 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
103 enum dma_data_direction direction)
105 consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
108 static inline void
109 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
110 unsigned long offset, size_t size,
111 enum dma_data_direction direction)
114 consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
117 static inline void
118 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
119 unsigned long offset, size_t size,
120 enum dma_data_direction direction)
123 consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
125 static inline void
126 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
127 enum dma_data_direction dir)
129 int i;
130 for (i = 0; i < nelems; i++, sg++)
131 consistent_sync(page_address(sg->page) + sg->offset,
132 sg->length, dir);
135 static inline void
136 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
137 enum dma_data_direction dir)
139 int i;
140 for (i = 0; i < nelems; i++, sg++)
141 consistent_sync(page_address(sg->page) + sg->offset,
142 sg->length, dir);
144 static inline int
145 dma_mapping_error(dma_addr_t dma_addr)
147 return 0;
150 static inline int
151 dma_supported(struct device *dev, u64 mask)
153 return 1;
156 static inline int
157 dma_set_mask(struct device *dev, u64 mask)
159 if(!dev->dma_mask || !dma_supported(dev, mask))
160 return -EIO;
162 *dev->dma_mask = mask;
164 return 0;
167 static inline int
168 dma_get_cache_alignment(void)
170 return L1_CACHE_BYTES;
173 #define dma_is_consistent(d, h) (1)
175 static inline void
176 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
177 enum dma_data_direction direction)
179 consistent_sync(vaddr, size, direction);
182 #endif /* _XTENSA_DMA_MAPPING_H */