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_ERROR_CODE          (~(dma_addr_t)0x0)
  32
  33 #define __dma_alloc_coherent(dev, gfp, size, handle)    NULL
  34 #define __dma_free_coherent(size, addr)         ((void)0)
  35
  36 /*
  37  * Available generic sets of operations
  38  */
  39 extern const struct dma_map_ops dma_direct_ops;
  40
  41 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
  42 {
  43         return &dma_direct_ops;
  44 }
  45
  46 static inline void __dma_sync(unsigned long paddr,
  47                               size_t size, enum dma_data_direction direction)
  48 {
  49         switch (direction) {
  50         case DMA_TO_DEVICE:
  51         case DMA_BIDIRECTIONAL:
  52                 flush_dcache_range(paddr, paddr + size);
  53                 break;
  54         case DMA_FROM_DEVICE:
  55                 invalidate_dcache_range(paddr, paddr + size);
  56                 break;
  57         default:
  58                 BUG();
  59         }
  60 }
  61
  62 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  63                 enum dma_data_direction direction)
  64 {
  65         BUG_ON(direction == DMA_NONE);
  66         __dma_sync(virt_to_phys(vaddr), size, (int)direction);
  67 }
  68
  69 #endif  /* _ASM_MICROBLAZE_DMA_MAPPING_H */