arch/unicore32/include/asm/dma-mapping.h

   1 /*
   2  * linux/arch/unicore32/include/asm/dma-mapping.h
   3  *
   4  * Code specific to PKUnity SoC and UniCore ISA
   5  *
   6  * Copyright (C) 2001-2010 GUAN Xue-tao
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #ifndef __UNICORE_DMA_MAPPING_H__
  13 #define __UNICORE_DMA_MAPPING_H__
  14
  15 #ifdef __KERNEL__
  16
  17 #include <linux/mm_types.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/swiotlb.h>
  20
  21 #include <asm/memory.h>
  22 #include <asm/cacheflush.h>
  23
  24 extern struct dma_map_ops swiotlb_dma_map_ops;
  25
  26 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  27 {
  28         return &swiotlb_dma_map_ops;
  29 }
  30
  31 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  32 {
  33         if (dev && dev->dma_mask)
  34                 return addr + size - 1 <= *dev->dma_mask;
  35
  36         return 1;
  37 }
  38
  39 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  40 {
  41         return paddr;
  42 }
  43
  44 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  45 {
  46         return daddr;
  47 }
  48
  49 static inline void dma_mark_clean(void *addr, size_t size) {}
  50
  51 static inline void dma_cache_sync(struct device *dev, void *vaddr,
  52                 size_t size, enum dma_data_direction direction)
  53 {
  54         unsigned long start = (unsigned long)vaddr;
  55         unsigned long end   = start + size;
  56
  57         switch (direction) {
  58         case DMA_NONE:
  59                 BUG();
  60         case DMA_FROM_DEVICE:
  61         case DMA_BIDIRECTIONAL: /* writeback and invalidate */
  62                 __cpuc_dma_flush_range(start, end);
  63                 break;
  64         case DMA_TO_DEVICE:             /* writeback only */
  65                 __cpuc_dma_clean_range(start, end);
  66                 break;
  67         }
  68 }
  69
  70 #endif /* __KERNEL__ */
  71 #endif