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

   1 /*
   2  * Implements the generic device dma API for microblaze and the pci
   3  *
   4  * Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu>
   5  * Copyright (C) 2009-2010 PetaLogix
   6  *
   7  * This file is subject to the terms and conditions of the GNU General
   8  * Public License. See the file COPYING in the main directory of this
   9  * archive for more details.
  10  *
  11  * This file is base on powerpc and x86 dma-mapping.h versions
  12  * Copyright (C) 2004 IBM
  13  */
  14
  15 #ifndef _ASM_MICROBLAZE_DMA_MAPPING_H
  16 #define _ASM_MICROBLAZE_DMA_MAPPING_H
  17
  18 /*
  19  * See Documentation/DMA-API-HOWTO.txt and
  20  * Documentation/DMA-API.txt for documentation.
  21  */
  22
  23 #include <linux/types.h>
  24 #include <linux/cache.h>
  25 #include <linux/mm.h>
  26 #include <linux/scatterlist.h>
  27 #include <linux/dma-debug.h>
  28 #include <asm/io.h>
  29 #include <asm/cacheflush.h>
  30
  31 #define __dma_alloc_coherent(dev, gfp, size, handle)    NULL
  32 #define __dma_free_coherent(size, addr)         ((void)0)
  33
  34 /*
  35  * Available generic sets of operations
  36  */
  37 extern const struct dma_map_ops dma_direct_ops;
  38
  39 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
  40 {
  41         return &dma_direct_ops;
  42 }
  43
  44 static inline void __dma_sync(unsigned long paddr,
  45                               size_t size, enum dma_data_direction direction)
  46 {
  47         switch (direction) {
  48         case DMA_TO_DEVICE:
  49         case DMA_BIDIRECTIONAL:
  50                 flush_dcache_range(paddr, paddr + size);
  51                 break;
  52         case DMA_FROM_DEVICE:
  53                 invalidate_dcache_range(paddr, paddr + size);
  54                 break;
  55         default:
  56                 BUG();
  57         }
  58 }
  59
  60 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  61                 enum dma_data_direction direction)
  62 {
  63         BUG_ON(direction == DMA_NONE);
  64         __dma_sync(virt_to_phys(vaddr), size, (int)direction);
  65 }
  66
  67 #endif  /* _ASM_MICROBLAZE_DMA_MAPPING_H */