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(struct device *dev,
  27         dma_addr_t dma_addr)
  28 {
  29         return dma_addr;
  30 }
  31
  32 static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
  33         size_t size, enum dma_data_direction direction)
  34 {
  35 }
  36
  37 static inline int plat_dma_supported(struct device *dev, u64 mask)
  38 {
  39         /*
  40          * we fall back to GFP_DMA when the mask isn't all 1s,
  41          * so we can't guarantee allocations that must be
  42          * within a tighter range than GFP_DMA..
  43          */
  44         if (mask < DMA_BIT_MASK(24))
  45                 return 0;
  46
  47         return 1;
  48 }
  49
  50 static inline int plat_device_is_coherent(struct device *dev)
  51 {
  52 #ifdef CONFIG_DMA_PERDEV_COHERENT
  53         return dev->archdata.dma_coherent;
  54 #else
  55         switch (coherentio) {
  56         default:
  57         case IO_COHERENCE_DEFAULT:
  58                 return hw_coherentio;
  59         case IO_COHERENCE_ENABLED:
  60                 return 1;
  61         case IO_COHERENCE_DISABLED:
  62                 return 0;
  63         }
  64 #endif
  65 }
  66
  67 #ifndef plat_post_dma_flush
  68 static inline void plat_post_dma_flush(struct device *dev)
  69 {
  70 }
  71 #endif
  72
  73 #ifdef CONFIG_SWIOTLB
  74 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  75 {
  76         return paddr;
  77 }
  78
  79 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  80 {
  81         return daddr;
  82 }
  83 #endif
  84
  85 #endif /* __ASM_MACH_GENERIC_DMA_COHERENCE_H */