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dma-coherence.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2006, 07  Ralf Baechle <ralf@linux-mips.org>
 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
 * Author: Fuxin Zhang, zhangfx@lemote.com
 *
 */
#ifndef __ASM_MACH_LOONGSON_DMA_COHERENCE_H
#define __ASM_MACH_LOONGSON_DMA_COHERENCE_H

struct device;

static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
                                size_t size)
{
      return virt_to_phys(addr) | 0x80000000;
}

static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
                                     struct page *page)
{
      return page_to_phys(page) | 0x80000000;
}

static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
      dma_addr_t dma_addr)
{
      return dma_addr & 0x7fffffff;
}

static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
      size_t size, enum dma_data_direction direction)
{
}

static inline int plat_dma_supported(struct device *dev, u64 mask)
{
      /*
       * we fall back to GFP_DMA when the mask isn't all 1s,
       * so we can't guarantee allocations that must be
       * within a tighter range than GFP_DMA..
       */
      if (mask < DMA_BIT_MASK(24))
            return 0;

      return 1;
}

static inline void plat_extra_sync_for_device(struct device *dev)
{
      return;
}

static inline int plat_dma_mapping_error(struct device *dev,
                               dma_addr_t dma_addr)
{
      return 0;
}

static inline int plat_device_is_coherent(struct device *dev)
{
      return 0;
}

#endif /* __ASM_MACH_LOONGSON_DMA_COHERENCE_H */

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