tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* Copyright (C) 2004 IBM
2 *
3 * Implements the generic device dma API for ppc64. Handles
4 * the pci and vio busses
5 */
6
7#ifndef _ASM_DMA_MAPPING_H
8#define _ASM_DMA_MAPPING_H
9
10#include <linux/types.h>
11#include <linux/cache.h>
12/* need struct page definitions */
13#include <linux/mm.h>
14#include <asm/scatterlist.h>
15#include <asm/bug.h>
16
17#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
18
19extern int dma_supported(struct device *dev, u64 mask);
20extern int dma_set_mask(struct device *dev, u64 dma_mask);
21extern void *dma_alloc_coherent(struct device *dev, size_t size,
22 dma_addr_t *dma_handle, unsigned int __nocast flag);
23extern void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
24 dma_addr_t dma_handle);
25extern dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
26 size_t size, enum dma_data_direction direction);
27extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
28 size_t size, enum dma_data_direction direction);
29extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
30 unsigned long offset, size_t size,
31 enum dma_data_direction direction);
32extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
33 size_t size, enum dma_data_direction direction);
34extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
35 enum dma_data_direction direction);
36extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
37 int nhwentries, enum dma_data_direction direction);
38
39static inline void
40dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
41 enum dma_data_direction direction)
42{
43 BUG_ON(direction == DMA_NONE);
44 /* nothing to do */
45}
46
47static inline void
48dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
49 enum dma_data_direction direction)
50{
51 BUG_ON(direction == DMA_NONE);
52 /* nothing to do */
53}
54
55static inline void
56dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
57 enum dma_data_direction direction)
58{
59 BUG_ON(direction == DMA_NONE);
60 /* nothing to do */
61}
62
63static inline void
64dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
65 enum dma_data_direction direction)
66{
67 BUG_ON(direction == DMA_NONE);
68 /* nothing to do */
69}
70
71static inline int dma_mapping_error(dma_addr_t dma_addr)
72{
73 return (dma_addr == DMA_ERROR_CODE);
74}
75
76/* Now for the API extensions over the pci_ one */
77
78#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
79#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
80#define dma_is_consistent(d) (1)
81
82static inline int
83dma_get_cache_alignment(void)
84{
85 /* no easy way to get cache size on all processors, so return
86 * the maximum possible, to be safe */
87 return (1 << L1_CACHE_SHIFT_MAX);
88}
89
90static inline void
91dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
92 unsigned long offset, size_t size,
93 enum dma_data_direction direction)
94{
95 BUG_ON(direction == DMA_NONE);
96 /* nothing to do */
97}
98
99static inline void
100dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
101 unsigned long offset, size_t size,
102 enum dma_data_direction direction)
103{
104 BUG_ON(direction == DMA_NONE);
105 /* nothing to do */
106}
107
108static inline void
109dma_cache_sync(void *vaddr, size_t size,
110 enum dma_data_direction direction)
111{
112 BUG_ON(direction == DMA_NONE);
113 /* nothing to do */
114}
115
116/*
117 * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
118 */
119struct dma_mapping_ops {
120 void * (*alloc_coherent)(struct device *dev, size_t size,
121 dma_addr_t *dma_handle, unsigned int __nocast flag);
122 void (*free_coherent)(struct device *dev, size_t size,
123 void *vaddr, dma_addr_t dma_handle);
124 dma_addr_t (*map_single)(struct device *dev, void *ptr,
125 size_t size, enum dma_data_direction direction);
126 void (*unmap_single)(struct device *dev, dma_addr_t dma_addr,
127 size_t size, enum dma_data_direction direction);
128 int (*map_sg)(struct device *dev, struct scatterlist *sg,
129 int nents, enum dma_data_direction direction);
130 void (*unmap_sg)(struct device *dev, struct scatterlist *sg,
131 int nents, enum dma_data_direction direction);
132 int (*dma_supported)(struct device *dev, u64 mask);
133 int (*dac_dma_supported)(struct device *dev, u64 mask);
134};
135
136#endif /* _ASM_DMA_MAPPING_H */