LXR linux/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
  24extern struct dma_map_ops swiotlb_dma_map_ops;
  25
  26static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  27{
  28        return &swiotlb_dma_map_ops;
  29}
  30
  31static 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
  39static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  40{
  41        return paddr;
  42}
  43
  44static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  45{
  46        return daddr;
  47}
  48
  49static inline void dma_mark_clean(void *addr, size_t size) {}
  50
  51static 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
  72