2 * Copyright (C) 2012 ARM Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #ifndef __ASM_DMA_MAPPING_H
17 #define __ASM_DMA_MAPPING_H
21 #include <linux/types.h>
22 #include <linux/vmalloc.h>
24 #include <asm-generic/dma-coherent.h>
26 #define ARCH_HAS_DMA_GET_REQUIRED_MASK
28 extern struct dma_map_ops *dma_ops;
30 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
32 if (unlikely(!dev) || !dev->archdata.dma_ops)
35 return dev->archdata.dma_ops;
38 #include <asm-generic/dma-mapping-common.h>
40 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
42 return (dma_addr_t)paddr;
45 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
47 return (phys_addr_t)dev_addr;
50 static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
52 struct dma_map_ops *ops = get_dma_ops(dev);
53 return ops->mapping_error(dev, dev_addr);
56 static inline int dma_supported(struct device *dev, u64 mask)
58 struct dma_map_ops *ops = get_dma_ops(dev);
59 return ops->dma_supported(dev, mask);
62 static inline int dma_set_mask(struct device *dev, u64 mask)
64 if (!dev->dma_mask || !dma_supported(dev, mask))
66 *dev->dma_mask = mask;
71 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
76 return addr + size - 1 <= *dev->dma_mask;
79 static inline void dma_mark_clean(void *addr, size_t size)
83 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
84 dma_addr_t *dma_handle, gfp_t flags)
86 struct dma_map_ops *ops = get_dma_ops(dev);
89 if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
92 vaddr = ops->alloc(dev, size, dma_handle, flags, NULL);
93 debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
97 static inline void dma_free_coherent(struct device *dev, size_t size,
98 void *vaddr, dma_addr_t dev_addr)
100 struct dma_map_ops *ops = get_dma_ops(dev);
102 if (dma_release_from_coherent(dev, get_order(size), vaddr))
105 debug_dma_free_coherent(dev, size, vaddr, dev_addr);
106 ops->free(dev, size, vaddr, dev_addr, NULL);
110 * There is no dma_cache_sync() implementation, so just return NULL here.
112 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
113 dma_addr_t *handle, gfp_t flags)
118 static inline void dma_free_noncoherent(struct device *dev, size_t size,
119 void *cpu_addr, dma_addr_t handle)
123 #endif /* __KERNEL__ */
124 #endif /* __ASM_DMA_MAPPING_H */