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