1 /*
2 * DMA operations for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. 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
get_dma_ops(struct device * dev)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,
53 enum dma_data_direction direction);
54
55 #include <asm-generic/dma-mapping-common.h>
56
dma_capable(struct device * dev,dma_addr_t addr,size_t size)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
dma_mapping_error(struct device * dev,dma_addr_t dma_addr)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
dma_alloc_attrs(struct device * dev,size_t size,dma_addr_t * dma_handle,gfp_t flag,struct dma_attrs * attrs)76 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
77 dma_addr_t *dma_handle, gfp_t flag,
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
dma_free_attrs(struct device * dev,size_t size,void * cpu_addr,dma_addr_t dma_handle,struct dma_attrs * attrs)94 static inline void dma_free_attrs(struct device *dev, size_t size,
95 void *cpu_addr, dma_addr_t dma_handle,
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
108