LXR linux/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
  33extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
  34                          enum dma_data_direction);
  35extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
  36                             size_t size, enum dma_data_direction);
  37extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  38               enum dma_data_direction);
  39extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
  40                         int nhwentries, enum dma_data_direction);
  41extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
  42                               unsigned long offset, size_t size,
  43                               enum dma_data_direction);
  44extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
  45                           size_t size, enum dma_data_direction);
  46extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
  47                                int nelems, enum dma_data_direction);
  48extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
  49                                   int nelems, enum dma_data_direction);
  50
  51
  52void *dma_alloc_coherent(struct device *dev, size_t size,
  53                           dma_addr_t *dma_handle, gfp_t flag);
  54
  55void dma_free_coherent(struct device *dev, size_t size,
  56                         void *vaddr, dma_addr_t dma_handle);
  57
  58extern void dma_sync_single_for_cpu(struct device *, dma_addr_t, size_t,
  59                                    enum dma_data_direction);
  60extern void dma_sync_single_for_device(struct device *, dma_addr_t,
  61                                       size_t, enum dma_data_direction);
  62extern void dma_sync_single_range_for_cpu(struct device *, dma_addr_t,
  63                                          unsigned long offset, size_t,
  64                                          enum dma_data_direction);
  65extern void dma_sync_single_range_for_device(struct device *, dma_addr_t,
  66                                             unsigned long offset, size_t,
  67                                             enum dma_data_direction);
  68extern void dma_cache_sync(void *vaddr, size_t, enum dma_data_direction);
  69
  70static inline int
  71dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  72{
  73        return 0;
  74}
  75
  76static inline int
  77dma_supported(struct device *dev, u64 mask)
  78{
  79        return 1;
  80}
  81
  82static inline int
  83dma_set_mask(struct device *dev, u64 mask)
  84{
  85        if (!dev->dma_mask || !dma_supported(dev, mask))
  86                return -EIO;
  87
  88        *dev->dma_mask = mask;
  89
  90        return 0;
  91}
  92
  93#endif /* _ASM_TILE_DMA_MAPPING_H */
  94