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#ifdef __tilegx__
  24#define ARCH_HAS_DMA_GET_REQUIRED_MASK
  25#endif
  26
  27extern struct dma_map_ops *tile_dma_map_ops;
  28extern struct dma_map_ops *gx_pci_dma_map_ops;
  29extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;
  30extern struct dma_map_ops *gx_hybrid_pci_dma_map_ops;
  31
  32static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  33{
  34        if (dev && dev->archdata.dma_ops)
  35                return dev->archdata.dma_ops;
  36        else
  37                return tile_dma_map_ops;
  38}
  39
  40static inline dma_addr_t get_dma_offset(struct device *dev)
  41{
  42        return dev->archdata.dma_offset;
  43}
  44
  45static inline void set_dma_offset(struct device *dev, dma_addr_t off)
  46{
  47        dev->archdata.dma_offset = off;
  48}
  49
  50static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  51{
  52        return paddr;
  53}
  54
  55static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  56{
  57        return daddr;
  58}
  59
  60static inline void dma_mark_clean(void *addr, size_t size) {}
  61
  62static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
  63{
  64        dev->archdata.dma_ops = ops;
  65}
  66
  67static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  68{
  69        if (!dev->dma_mask)
  70                return 0;
  71
  72        return addr + size - 1 <= *dev->dma_mask;
  73}
  74
  75#define HAVE_ARCH_DMA_SET_MASK 1
  76int dma_set_mask(struct device *dev, u64 mask);
  77
  78/*
  79 * dma_alloc_noncoherent() is #defined to return coherent memory,
  80 * so there's no need to do any flushing here.
  81 */
  82static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  83                                  enum dma_data_direction direction)
  84{
  85}
  86
  87#endif /* _ASM_TILE_DMA_MAPPING_H */
  88