LXR linux/arch/mips/include/asm/mach-loongson/dma-coherence.h

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 2006, 07  Ralf Baechle <ralf@linux-mips.org>
   7 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
   8 * Author: Fuxin Zhang, zhangfx@lemote.com
   9 *
  10 */
  11#ifndef __ASM_MACH_LOONGSON_DMA_COHERENCE_H
  12#define __ASM_MACH_LOONGSON_DMA_COHERENCE_H
  13
  14struct device;
  15
  16static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
  17                                          size_t size)
  18{
  19        return virt_to_phys(addr) | 0x80000000;
  20}
  21
  22static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
  23                                               struct page *page)
  24{
  25        return page_to_phys(page) | 0x80000000;
  26}
  27
  28static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
  29        dma_addr_t dma_addr)
  30{
  31        return dma_addr & 0x7fffffff;
  32}
  33
  34static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
  35        size_t size, enum dma_data_direction direction)
  36{
  37}
  38
  39static inline int plat_dma_supported(struct device *dev, u64 mask)
  40{
  41        /*
  42         * we fall back to GFP_DMA when the mask isn't all 1s,
  43         * so we can't guarantee allocations that must be
  44         * within a tighter range than GFP_DMA..
  45         */
  46        if (mask < DMA_BIT_MASK(24))
  47                return 0;
  48
  49        return 1;
  50}
  51
  52static inline void plat_extra_sync_for_device(struct device *dev)
  53{
  54        return;
  55}
  56
  57static inline int plat_dma_mapping_error(struct device *dev,
  58                                         dma_addr_t dma_addr)
  59{
  60        return 0;
  61}
  62
  63static inline int plat_device_is_coherent(struct device *dev)
  64{
  65        return 0;
  66}
  67
  68#endif /* __ASM_MACH_LOONGSON_DMA_COHERENCE_H */
  69