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
  27 extern struct dma_map_ops *tile_dma_map_ops;
  28 extern struct dma_map_ops *gx_pci_dma_map_ops;
  29 extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;
  30 extern struct dma_map_ops *gx_hybrid_pci_dma_map_ops;
  31
  32 static 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
  40 static inline dma_addr_t get_dma_offset(struct device *dev)
  41 {
  42         return dev->archdata.dma_offset;
  43 }
  44
  45 static inline void set_dma_offset(struct device *dev, dma_addr_t off)
  46 {
  47         dev->archdata.dma_offset = off;
  48 }
  49
  50 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  51 {
  52         return paddr;
  53 }
  54
  55 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  56 {
  57         return daddr;
  58 }
  59
  60 static inline void dma_mark_clean(void *addr, size_t size) {}
  61
  62 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
  63 {
  64         dev->archdata.dma_ops = ops;
  65 }
  66
  67 static 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
  76 int 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  */
  82 static 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 */