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dma-coherence.h
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1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License. See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 2006 Ralf Baechle <[email protected]>
7  *
8  */
9 #ifndef __ASM_MACH_GENERIC_DMA_COHERENCE_H
10 #define __ASM_MACH_GENERIC_DMA_COHERENCE_H
11 
12 struct device;
13 
14 static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
15  size_t size)
16 {
17  return virt_to_phys(addr);
18 }
19 
20 static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
21  struct page *page)
22 {
23  return page_to_phys(page);
24 }
25 
26 static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
28 {
29  return dma_addr;
30 }
31 
32 static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
33  size_t size, enum dma_data_direction direction)
34 {
35 }
36 
37 static inline int plat_dma_supported(struct device *dev, u64 mask)
38 {
39  /*
40  * we fall back to GFP_DMA when the mask isn't all 1s,
41  * so we can't guarantee allocations that must be
42  * within a tighter range than GFP_DMA..
43  */
44  if (mask < DMA_BIT_MASK(24))
45  return 0;
46 
47  return 1;
48 }
49 
50 static inline void plat_extra_sync_for_device(struct device *dev)
51 {
52 }
53 
54 static inline int plat_dma_mapping_error(struct device *dev,
56 {
57  return 0;
58 }
59 
60 static inline int plat_device_is_coherent(struct device *dev)
61 {
62 #ifdef CONFIG_DMA_COHERENT
63  return 1;
64 #endif
65 #ifdef CONFIG_DMA_NONCOHERENT
66  return 0;
67 #endif
68 }
69 
70 #endif /* __ASM_MACH_GENERIC_DMA_COHERENCE_H */