tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <ralf@linux-mips.org>
7 *
8 */
9#ifndef __ASM_MACH_GENERIC_DMA_COHERENCE_H
10#define __ASM_MACH_GENERIC_DMA_COHERENCE_H
11
12struct device;
13
14static 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
20static 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
26static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
27 dma_addr_t dma_addr)
28{
29 return dma_addr;
30}
31
32static 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
37static 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
50static inline void plat_extra_sync_for_device(struct device *dev)
51{
52}
53
54static inline int plat_dma_mapping_error(struct device *dev,
55 dma_addr_t dma_addr)
56{
57 return 0;
58}
59
60static 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 */