tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Port on Texas Instruments TMS320C6x architecture
3 *
4 * Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
5 * Author: Aurelien Jacquiot <aurelien.jacquiot@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12#ifndef _ASM_C6X_DMA_MAPPING_H
13#define _ASM_C6X_DMA_MAPPING_H
14
15#include <linux/dma-debug.h>
16#include <asm-generic/dma-coherent.h>
17
18#define dma_supported(d, m) 1
19
20static inline int dma_set_mask(struct device *dev, u64 dma_mask)
21{
22 if (!dev->dma_mask || !dma_supported(dev, dma_mask))
23 return -EIO;
24
25 *dev->dma_mask = dma_mask;
26
27 return 0;
28}
29
30/*
31 * DMA errors are defined by all-bits-set in the DMA address.
32 */
33static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
34{
35 return dma_addr == ~0;
36}
37
38extern dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
39 size_t size, enum dma_data_direction dir);
40
41extern void dma_unmap_single(struct device *dev, dma_addr_t handle,
42 size_t size, enum dma_data_direction dir);
43
44extern int dma_map_sg(struct device *dev, struct scatterlist *sglist,
45 int nents, enum dma_data_direction direction);
46
47extern void dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
48 int nents, enum dma_data_direction direction);
49
50static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
51 unsigned long offset, size_t size,
52 enum dma_data_direction dir)
53{
54 dma_addr_t handle;
55
56 handle = dma_map_single(dev, page_address(page) + offset, size, dir);
57
58 debug_dma_map_page(dev, page, offset, size, dir, handle, false);
59
60 return handle;
61}
62
63static inline void dma_unmap_page(struct device *dev, dma_addr_t handle,
64 size_t size, enum dma_data_direction dir)
65{
66 dma_unmap_single(dev, handle, size, dir);
67
68 debug_dma_unmap_page(dev, handle, size, dir, false);
69}
70
71extern void dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
72 size_t size, enum dma_data_direction dir);
73
74extern void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
75 size_t size,
76 enum dma_data_direction dir);
77
78extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
79 int nents, enum dma_data_direction dir);
80
81extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
82 int nents, enum dma_data_direction dir);
83
84extern void coherent_mem_init(u32 start, u32 size);
85extern void *dma_alloc_coherent(struct device *, size_t, dma_addr_t *, gfp_t);
86extern void dma_free_coherent(struct device *, size_t, void *, dma_addr_t);
87
88#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent((d), (s), (h), (f))
89#define dma_free_noncoherent(d, s, v, h) dma_free_coherent((d), (s), (v), (h))
90
91#endif /* _ASM_C6X_DMA_MAPPING_H */