tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __ASM_SH_DMA_MAPPING_H
2#define __ASM_SH_DMA_MAPPING_H
3
4#include <linux/config.h>
5#include <linux/mm.h>
6#include <asm/scatterlist.h>
7#include <asm/cacheflush.h>
8#include <asm/io.h>
9
10extern struct bus_type pci_bus_type;
11
12/* arch/sh/mm/consistent.c */
13extern void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *handle);
14extern void consistent_free(void *vaddr, size_t size);
15extern void consistent_sync(void *vaddr, size_t size, int direction);
16
17#define dma_supported(dev, mask) (1)
18
19static inline int dma_set_mask(struct device *dev, u64 mask)
20{
21 if (!dev->dma_mask || !dma_supported(dev, mask))
22 return -EIO;
23
24 *dev->dma_mask = mask;
25
26 return 0;
27}
28
29static inline void *dma_alloc_coherent(struct device *dev, size_t size,
30 dma_addr_t *dma_handle, gfp_t flag)
31{
32 if (sh_mv.mv_consistent_alloc) {
33 void *ret;
34
35 ret = sh_mv.mv_consistent_alloc(dev, size, dma_handle, flag);
36 if (ret != NULL)
37 return ret;
38 }
39
40 return consistent_alloc(flag, size, dma_handle);
41}
42
43static inline void dma_free_coherent(struct device *dev, size_t size,
44 void *vaddr, dma_addr_t dma_handle)
45{
46 if (sh_mv.mv_consistent_free) {
47 int ret;
48
49 ret = sh_mv.mv_consistent_free(dev, size, vaddr, dma_handle);
50 if (ret == 0)
51 return;
52 }
53
54 consistent_free(vaddr, size);
55}
56
57static inline void dma_cache_sync(void *vaddr, size_t size,
58 enum dma_data_direction dir)
59{
60 consistent_sync(vaddr, size, (int)dir);
61}
62
63static inline dma_addr_t dma_map_single(struct device *dev,
64 void *ptr, size_t size,
65 enum dma_data_direction dir)
66{
67#if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
68 if (dev->bus == &pci_bus_type)
69 return virt_to_bus(ptr);
70#endif
71 dma_cache_sync(ptr, size, dir);
72
73 return virt_to_bus(ptr);
74}
75
76#define dma_unmap_single(dev, addr, size, dir) do { } while (0)
77
78static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
79 int nents, enum dma_data_direction dir)
80{
81 int i;
82
83 for (i = 0; i < nents; i++) {
84#if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
85 dma_cache_sync(page_address(sg[i].page) + sg[i].offset,
86 sg[i].length, dir);
87#endif
88 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
89 }
90
91 return nents;
92}
93
94#define dma_unmap_sg(dev, sg, nents, dir) do { } while (0)
95
96static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
97 unsigned long offset, size_t size,
98 enum dma_data_direction dir)
99{
100 return dma_map_single(dev, page_address(page) + offset, size, dir);
101}
102
103static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
104 size_t size, enum dma_data_direction dir)
105{
106 dma_unmap_single(dev, dma_address, size, dir);
107}
108
109static inline void dma_sync_single(struct device *dev, dma_addr_t dma_handle,
110 size_t size, enum dma_data_direction dir)
111{
112#if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
113 if (dev->bus == &pci_bus_type)
114 return;
115#endif
116 dma_cache_sync(bus_to_virt(dma_handle), size, dir);
117}
118
119static inline void dma_sync_single_range(struct device *dev,
120 dma_addr_t dma_handle,
121 unsigned long offset, size_t size,
122 enum dma_data_direction dir)
123{
124#if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
125 if (dev->bus == &pci_bus_type)
126 return;
127#endif
128 dma_cache_sync(bus_to_virt(dma_handle) + offset, size, dir);
129}
130
131static inline void dma_sync_sg(struct device *dev, struct scatterlist *sg,
132 int nelems, enum dma_data_direction dir)
133{
134 int i;
135
136 for (i = 0; i < nelems; i++) {
137#if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
138 dma_cache_sync(page_address(sg[i].page) + sg[i].offset,
139 sg[i].length, dir);
140#endif
141 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
142 }
143}
144
145static void dma_sync_single_for_cpu(struct device *dev,
146 dma_addr_t dma_handle, size_t size,
147 enum dma_data_direction dir)
148 __attribute__ ((alias("dma_sync_single")));
149
150static void dma_sync_single_for_device(struct device *dev,
151 dma_addr_t dma_handle, size_t size,
152 enum dma_data_direction dir)
153 __attribute__ ((alias("dma_sync_single")));
154
155static void dma_sync_sg_for_cpu(struct device *dev,
156 struct scatterlist *sg, int nelems,
157 enum dma_data_direction dir)
158 __attribute__ ((alias("dma_sync_sg")));
159
160static void dma_sync_sg_for_device(struct device *dev,
161 struct scatterlist *sg, int nelems,
162 enum dma_data_direction dir)
163 __attribute__ ((alias("dma_sync_sg")));
164
165static inline int dma_get_cache_alignment(void)
166{
167 /*
168 * Each processor family will define its own L1_CACHE_SHIFT,
169 * L1_CACHE_BYTES wraps to this, so this is always safe.
170 */
171 return L1_CACHE_BYTES;
172}
173
174static inline int dma_mapping_error(dma_addr_t dma_addr)
175{
176 return dma_addr == 0;
177}
178
179#endif /* __ASM_SH_DMA_MAPPING_H */
180