1 /* DMA mapping routines for the MN10300 arch
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11 #ifndef _ASM_DMA_MAPPING_H
12 #define _ASM_DMA_MAPPING_H
13
14 #include <linux/mm.h>
15 #include <linux/scatterlist.h>
16
17 #include <asm/cache.h>
18 #include <asm/io.h>
19
20 /*
21 * See Documentation/DMA-API.txt for the description of how the
22 * following DMA API should work.
23 */
24
25 extern void *dma_alloc_coherent(struct device *dev, size_t size,
26 dma_addr_t *dma_handle, int flag);
27
28 extern void dma_free_coherent(struct device *dev, size_t size,
29 void *vaddr, dma_addr_t dma_handle);
30
31 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent((d), (s), (h), (f))
32 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent((d), (s), (v), (h))
33
34 static inline
dma_map_single(struct device * dev,void * ptr,size_t size,enum dma_data_direction direction)35 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
36 enum dma_data_direction direction)
37 {
38 BUG_ON(direction == DMA_NONE);
39 mn10300_dcache_flush_inv();
40 return virt_to_bus(ptr);
41 }
42
43 static inline
dma_unmap_single(struct device * dev,dma_addr_t dma_addr,size_t size,enum dma_data_direction direction)44 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
45 enum dma_data_direction direction)
46 {
47 BUG_ON(direction == DMA_NONE);
48 }
49
50 static inline
dma_map_sg(struct device * dev,struct scatterlist * sglist,int nents,enum dma_data_direction direction)51 int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
52 enum dma_data_direction direction)
53 {
54 struct scatterlist *sg;
55 int i;
56
57 BUG_ON(!valid_dma_direction(direction));
58 WARN_ON(nents == 0 || sglist[0].length == 0);
59
60 for_each_sg(sglist, sg, nents, i) {
61 BUG_ON(!sg_page(sg));
62
63 sg->dma_address = sg_phys(sg);
64 }
65
66 mn10300_dcache_flush_inv();
67 return nents;
68 }
69
70 static inline
dma_unmap_sg(struct device * dev,struct scatterlist * sg,int nhwentries,enum dma_data_direction direction)71 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
72 enum dma_data_direction direction)
73 {
74 BUG_ON(!valid_dma_direction(direction));
75 }
76
77 static inline
dma_map_page(struct device * dev,struct page * page,unsigned long offset,size_t size,enum dma_data_direction direction)78 dma_addr_t dma_map_page(struct device *dev, struct page *page,
79 unsigned long offset, size_t size,
80 enum dma_data_direction direction)
81 {
82 BUG_ON(direction == DMA_NONE);
83 return page_to_bus(page) + offset;
84 }
85
86 static inline
dma_unmap_page(struct device * dev,dma_addr_t dma_address,size_t size,enum dma_data_direction direction)87 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
88 enum dma_data_direction direction)
89 {
90 BUG_ON(direction == DMA_NONE);
91 }
92
93 static inline
dma_sync_single_for_cpu(struct device * dev,dma_addr_t dma_handle,size_t size,enum dma_data_direction direction)94 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
95 size_t size, enum dma_data_direction direction)
96 {
97 }
98
99 static inline
dma_sync_single_for_device(struct device * dev,dma_addr_t dma_handle,size_t size,enum dma_data_direction direction)100 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
101 size_t size, enum dma_data_direction direction)
102 {
103 mn10300_dcache_flush_inv();
104 }
105
106 static inline
dma_sync_single_range_for_cpu(struct device * dev,dma_addr_t dma_handle,unsigned long offset,size_t size,enum dma_data_direction direction)107 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
108 unsigned long offset, size_t size,
109 enum dma_data_direction direction)
110 {
111 }
112
113 static inline void
dma_sync_single_range_for_device(struct device * dev,dma_addr_t dma_handle,unsigned long offset,size_t size,enum dma_data_direction direction)114 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
115 unsigned long offset, size_t size,
116 enum dma_data_direction direction)
117 {
118 mn10300_dcache_flush_inv();
119 }
120
121
122 static inline
dma_sync_sg_for_cpu(struct device * dev,struct scatterlist * sg,int nelems,enum dma_data_direction direction)123 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
124 int nelems, enum dma_data_direction direction)
125 {
126 }
127
128 static inline
dma_sync_sg_for_device(struct device * dev,struct scatterlist * sg,int nelems,enum dma_data_direction direction)129 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
130 int nelems, enum dma_data_direction direction)
131 {
132 mn10300_dcache_flush_inv();
133 }
134
135 static inline
dma_mapping_error(struct device * dev,dma_addr_t dma_addr)136 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
137 {
138 return 0;
139 }
140
141 static inline
dma_supported(struct device * dev,u64 mask)142 int dma_supported(struct device *dev, u64 mask)
143 {
144 /*
145 * we fall back to GFP_DMA when the mask isn't all 1s, so we can't
146 * guarantee allocations that must be within a tighter range than
147 * GFP_DMA
148 */
149 if (mask < 0x00ffffff)
150 return 0;
151 return 1;
152 }
153
154 static inline
dma_set_mask(struct device * dev,u64 mask)155 int dma_set_mask(struct device *dev, u64 mask)
156 {
157 if (!dev->dma_mask || !dma_supported(dev, mask))
158 return -EIO;
159
160 *dev->dma_mask = mask;
161 return 0;
162 }
163
164 static inline
dma_cache_sync(void * vaddr,size_t size,enum dma_data_direction direction)165 void dma_cache_sync(void *vaddr, size_t size,
166 enum dma_data_direction direction)
167 {
168 mn10300_dcache_flush_inv();
169 }
170
171 /* Not supported for now */
dma_mmap_coherent(struct device * dev,struct vm_area_struct * vma,void * cpu_addr,dma_addr_t dma_addr,size_t size)172 static inline int dma_mmap_coherent(struct device *dev,
173 struct vm_area_struct *vma, void *cpu_addr,
174 dma_addr_t dma_addr, size_t size)
175 {
176 return -EINVAL;
177 }
178
dma_get_sgtable(struct device * dev,struct sg_table * sgt,void * cpu_addr,dma_addr_t dma_addr,size_t size)179 static inline int dma_get_sgtable(struct device *dev, struct sg_table *sgt,
180 void *cpu_addr, dma_addr_t dma_addr,
181 size_t size)
182 {
183 return -EINVAL;
184 }
185
186 #endif
187