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Linux/arch/tile/include/asm/dma-mapping.h

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  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 /*
 24  * Note that on x86 and powerpc, there is a "struct dma_mapping_ops"
 25  * that is used for all the DMA operations.  For now, we don't have an
 26  * equivalent on tile, because we only have a single way of doing DMA.
 27  * (Tilera bug 7994 to use dma_mapping_ops.)
 28  */
 29 
 30 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 31 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 32 
 33 extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
 34                           enum dma_data_direction);
 35 extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
 36                              size_t size, enum dma_data_direction);
 37 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 38                enum dma_data_direction);
 39 extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 40                          int nhwentries, enum dma_data_direction);
 41 extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
 42                                unsigned long offset, size_t size,
 43                                enum dma_data_direction);
 44 extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 45                            size_t size, enum dma_data_direction);
 46 extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 47                                 int nelems, enum dma_data_direction);
 48 extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 49                                    int nelems, enum dma_data_direction);
 50 
 51 
 52 void *dma_alloc_coherent(struct device *dev, size_t size,
 53                            dma_addr_t *dma_handle, gfp_t flag);
 54 
 55 void dma_free_coherent(struct device *dev, size_t size,
 56                          void *vaddr, dma_addr_t dma_handle);
 57 
 58 extern void dma_sync_single_for_cpu(struct device *, dma_addr_t, size_t,
 59                                     enum dma_data_direction);
 60 extern void dma_sync_single_for_device(struct device *, dma_addr_t,
 61                                        size_t, enum dma_data_direction);
 62 extern void dma_sync_single_range_for_cpu(struct device *, dma_addr_t,
 63                                           unsigned long offset, size_t,
 64                                           enum dma_data_direction);
 65 extern void dma_sync_single_range_for_device(struct device *, dma_addr_t,
 66                                              unsigned long offset, size_t,
 67                                              enum dma_data_direction);
 68 extern void dma_cache_sync(struct device *dev, void *vaddr, size_t,
 69                            enum dma_data_direction);
 70 
 71 static inline int
 72 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 73 {
 74         return 0;
 75 }
 76 
 77 static inline int
 78 dma_supported(struct device *dev, u64 mask)
 79 {
 80         return 1;
 81 }
 82 
 83 static inline int
 84 dma_set_mask(struct device *dev, u64 mask)
 85 {
 86         if (!dev->dma_mask || !dma_supported(dev, mask))
 87                 return -EIO;
 88 
 89         *dev->dma_mask = mask;
 90 
 91         return 0;
 92 }
 93 
 94 #endif /* _ASM_TILE_DMA_MAPPING_H */
 95 

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