2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
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.
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
15 #ifndef _ASM_TILE_DMA_MAPPING_H
16 #define _ASM_TILE_DMA_MAPPING_H
19 #include <linux/scatterlist.h>
20 #include <linux/cache.h>
23 extern struct dma_map_ops *tile_dma_map_ops;
24 extern struct dma_map_ops *gx_pci_dma_map_ops;
25 extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;
27 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
29 if (dev && dev->archdata.dma_ops)
30 return dev->archdata.dma_ops;
32 return tile_dma_map_ops;
35 static inline dma_addr_t get_dma_offset(struct device *dev)
37 return dev->archdata.dma_offset;
40 static inline void set_dma_offset(struct device *dev, dma_addr_t off)
42 dev->archdata.dma_offset = off;
45 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
47 return paddr + get_dma_offset(dev);
50 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
52 return daddr - get_dma_offset(dev);
55 static inline void dma_mark_clean(void *addr, size_t size) {}
57 #include <asm-generic/dma-mapping-common.h>
59 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
61 dev->archdata.dma_ops = ops;
64 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
69 return addr + size - 1 <= *dev->dma_mask;
73 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
75 return get_dma_ops(dev)->mapping_error(dev, dma_addr);
79 dma_supported(struct device *dev, u64 mask)
81 return get_dma_ops(dev)->dma_supported(dev, mask);
85 dma_set_mask(struct device *dev, u64 mask)
87 struct dma_map_ops *dma_ops = get_dma_ops(dev);
89 /* Handle legacy PCI devices with limited memory addressability. */
90 if ((dma_ops == gx_pci_dma_map_ops) && (mask <= DMA_BIT_MASK(32))) {
91 set_dma_ops(dev, gx_legacy_pci_dma_map_ops);
92 set_dma_offset(dev, 0);
93 if (mask > dev->archdata.max_direct_dma_addr)
94 mask = dev->archdata.max_direct_dma_addr;
97 if (!dev->dma_mask || !dma_supported(dev, mask))
100 *dev->dma_mask = mask;
105 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
106 dma_addr_t *dma_handle, gfp_t flag,
107 struct dma_attrs *attrs)
109 struct dma_map_ops *dma_ops = get_dma_ops(dev);
112 cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs);
114 debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
119 static inline void dma_free_attrs(struct device *dev, size_t size,
120 void *cpu_addr, dma_addr_t dma_handle,
121 struct dma_attrs *attrs)
123 struct dma_map_ops *dma_ops = get_dma_ops(dev);
125 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
127 dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
130 #define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
131 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
132 #define dma_free_coherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
133 #define dma_free_noncoherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
136 * dma_alloc_noncoherent() is #defined to return coherent memory,
137 * so there's no need to do any flushing here.
139 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
140 enum dma_data_direction direction)
144 #endif /* _ASM_TILE_DMA_MAPPING_H */