tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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-debug.h>
29#include <linux/dma-attrs.h>
30#include <asm/io.h>
31
32struct device;
33extern int bad_dma_address;
34
35extern struct dma_map_ops *dma_ops;
36
37#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
38#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
39
40static inline struct dma_map_ops *get_dma_ops(struct device *dev)
41{
42 if (unlikely(dev == NULL))
43 return NULL;
44
45 return dma_ops;
46}
47
48extern int dma_supported(struct device *dev, u64 mask);
49extern int dma_set_mask(struct device *dev, u64 mask);
50extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
51extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
52 enum dma_data_direction direction);
53
54#include <asm-generic/dma-mapping-common.h>
55
56static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
57{
58 if (!dev->dma_mask)
59 return 0;
60 return addr + size - 1 <= *dev->dma_mask;
61}
62
63static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
64{
65 struct dma_map_ops *dma_ops = get_dma_ops(dev);
66
67 if (dma_ops->mapping_error)
68 return dma_ops->mapping_error(dev, dma_addr);
69
70 return (dma_addr == bad_dma_address);
71}
72
73#define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)
74
75static inline void *dma_alloc_attrs(struct device *dev, size_t size,
76 dma_addr_t *dma_handle, gfp_t flag,
77 struct dma_attrs *attrs)
78{
79 void *ret;
80 struct dma_map_ops *ops = get_dma_ops(dev);
81
82 BUG_ON(!dma_ops);
83
84 ret = ops->alloc(dev, size, dma_handle, flag, attrs);
85
86 debug_dma_alloc_coherent(dev, size, *dma_handle, ret);
87
88 return ret;
89}
90
91#define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
92
93static inline void dma_free_attrs(struct device *dev, size_t size,
94 void *cpu_addr, dma_addr_t dma_handle,
95 struct dma_attrs *attrs)
96{
97 struct dma_map_ops *dma_ops = get_dma_ops(dev);
98
99 BUG_ON(!dma_ops);
100
101 dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
102
103 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
104}
105
106#endif