1 /*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 */
14
15 #ifndef _ASM_TILE_DMA_MAPPING_H
16 #define _ASM_TILE_DMA_MAPPING_H
17
18 #include <linux/mm.h>
19 #include <linux/scatterlist.h>
20 #include <linux/cache.h>
21 #include <linux/io.h>
22
23 #ifdef __tilegx__
24 #define ARCH_HAS_DMA_GET_REQUIRED_MASK
25 #endif
26
27 extern const struct dma_map_ops *tile_dma_map_ops;
28 extern const struct dma_map_ops *gx_pci_dma_map_ops;
29 extern const struct dma_map_ops *gx_legacy_pci_dma_map_ops;
30 extern const struct dma_map_ops *gx_hybrid_pci_dma_map_ops;
31
get_arch_dma_ops(struct bus_type * bus)32 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
33 {
34 return tile_dma_map_ops;
35 }
36
get_dma_offset(struct device * dev)37 static inline dma_addr_t get_dma_offset(struct device *dev)
38 {
39 return dev->archdata.dma_offset;
40 }
41
set_dma_offset(struct device * dev,dma_addr_t off)42 static inline void set_dma_offset(struct device *dev, dma_addr_t off)
43 {
44 dev->archdata.dma_offset = off;
45 }
46
phys_to_dma(struct device * dev,phys_addr_t paddr)47 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
48 {
49 return paddr;
50 }
51
dma_to_phys(struct device * dev,dma_addr_t daddr)52 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
53 {
54 return daddr;
55 }
56
dma_mark_clean(void * addr,size_t size)57 static inline void dma_mark_clean(void *addr, size_t size) {}
58
dma_capable(struct device * dev,dma_addr_t addr,size_t size)59 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
60 {
61 if (!dev->dma_mask)
62 return 0;
63
64 return addr + size - 1 <= *dev->dma_mask;
65 }
66
67 #define HAVE_ARCH_DMA_SET_MASK 1
68 int dma_set_mask(struct device *dev, u64 mask);
69
70 /*
71 * dma_alloc_attrs() always returns non-cacheable memory, so there's no need to
72 * do any flushing here.
73 */
dma_cache_sync(struct device * dev,void * vaddr,size_t size,enum dma_data_direction direction)74 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
75 enum dma_data_direction direction)
76 {
77 }
78
79 #endif /* _ASM_TILE_DMA_MAPPING_H */
80