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dma-mapping.h
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1 /*
2  * DMA operations for the Hexagon architecture
3  *
4  * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 and
8  * only version 2 as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18  * 02110-1301, USA.
19  */
20 
21 #ifndef _ASM_DMA_MAPPING_H
22 #define _ASM_DMA_MAPPING_H
23 
24 #include <linux/types.h>
25 #include <linux/cache.h>
26 #include <linux/mm.h>
27 #include <linux/scatterlist.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/dma-debug.h>
30 #include <linux/dma-attrs.h>
31 #include <asm/io.h>
32 
33 struct device;
34 extern int bad_dma_address;
35 
36 extern struct dma_map_ops *dma_ops;
37 
38 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
39 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
40 
41 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
42 {
43  if (unlikely(dev == NULL))
44  return NULL;
45 
46  return dma_ops;
47 }
48 
49 extern int dma_supported(struct device *dev, u64 mask);
50 extern int dma_set_mask(struct device *dev, u64 mask);
51 extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
52 extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
54 
56 
57 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
58 {
59  if (!dev->dma_mask)
60  return 0;
61  return addr + size - 1 <= *dev->dma_mask;
62 }
63 
64 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
65 {
66  struct dma_map_ops *dma_ops = get_dma_ops(dev);
67 
68  if (dma_ops->mapping_error)
69  return dma_ops->mapping_error(dev, dma_addr);
70 
71  return (dma_addr == bad_dma_address);
72 }
73 
74 #define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)
75 
76 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
78  struct dma_attrs *attrs)
79 {
80  void *ret;
81  struct dma_map_ops *ops = get_dma_ops(dev);
82 
83  BUG_ON(!dma_ops);
84 
85  ret = ops->alloc(dev, size, dma_handle, flag, attrs);
86 
87  debug_dma_alloc_coherent(dev, size, *dma_handle, ret);
88 
89  return ret;
90 }
91 
92 #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
93 
94 static inline void dma_free_attrs(struct device *dev, size_t size,
96  struct dma_attrs *attrs)
97 {
98  struct dma_map_ops *dma_ops = get_dma_ops(dev);
99 
100  BUG_ON(!dma_ops);
101 
102  dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
103 
104  debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
105 }
106 
107 #endif