kernel/2.6.29.6-aldebaran-rt/arch/mips/include/asm/mach-generic/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  Ralf Baechle <ralf@linux-mips.org>
   7  *
   8  */
   9 #ifndef __ASM_MACH_GENERIC_DMA_COHERENCE_H
  10 #define __ASM_MACH_GENERIC_DMA_COHERENCE_H
  11
  12 struct device;
  13
  14 static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
  15         size_t size)
  16 {
  17         return virt_to_phys(addr);
  18 }
  19
  20 static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
  21         struct page *page)
  22 {
  23         return page_to_phys(page);
  24 }
  25
  26 static inline unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)
  27 {
  28         return dma_addr;
  29 }
  30
  31 static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr)
  32 {
  33 }
  34
  35 static inline int plat_dma_supported(struct device *dev, u64 mask)
  36 {
  37         /*
  38          * we fall back to GFP_DMA when the mask isn't all 1s,
  39          * so we can't guarantee allocations that must be
  40          * within a tighter range than GFP_DMA..
  41          */
  42         if (mask < DMA_BIT_MASK(24))
  43                 return 0;
  44
  45         return 1;
  46 }
  47
  48 static inline void plat_extra_sync_for_device(struct device *dev)
  49 {
  50         return;
  51 }
  52
  53 static inline int plat_dma_mapping_error(struct device *dev,
  54                                          dma_addr_t dma_addr)
  55 {
  56         return 0;
  57 }
  58
  59 static inline int plat_device_is_coherent(struct device *dev)
  60 {
  61 #ifdef CONFIG_DMA_COHERENT
  62         return 1;
  63 #endif
  64 #ifdef CONFIG_DMA_NONCOHERENT
  65         return 0;
  66 #endif
  67 }
  68
  69 #endif /* __ASM_MACH_GENERIC_DMA_COHERENCE_H */