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

   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 */