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 <asm/io.h>
30
31 struct device;
32 extern int bad_dma_address;
33 #define DMA_ERROR_CODE bad_dma_address
34
35 extern struct dma_map_ops *dma_ops;
36
get_dma_ops(struct device * dev)37 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
38 {
39 if (unlikely(dev == NULL))
40 return NULL;
41
42 return dma_ops;
43 }
44
45 #define HAVE_ARCH_DMA_SUPPORTED 1
46 extern int dma_supported(struct device *dev, u64 mask);
47 extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
48 extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
49 enum dma_data_direction direction);
50
dma_capable(struct device * dev,dma_addr_t addr,size_t size)51 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
52 {
53 if (!dev->dma_mask)
54 return 0;
55 return addr + size - 1 <= *dev->dma_mask;
56 }
57
58 #endif
59