arch/mips/include/asm/mach-jazz/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 #ifndef __ASM_MACH_JAZZ_DMA_COHERENCE_H
   9 #define __ASM_MACH_JAZZ_DMA_COHERENCE_H
  10
  11 #include <asm/jazzdma.h>
  12
  13 struct device;
  14
  15 static dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size)
  16 {
  17         return vdma_alloc(virt_to_phys(addr), size);
  18 }
  19
  20 static dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)
  21 {
  22         return vdma_alloc(page_to_phys(page), PAGE_SIZE);
  23 }
  24
  25 static unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)
  26 {
  27         return vdma_log2phys(dma_addr);
  28 }
  29
  30 static void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
  31         size_t size, enum dma_data_direction direction)
  32 {
  33         vdma_free(dma_addr);
  34 }
  35
  36 static inline int plat_dma_supported(struct device *dev, u64 mask)
  37 {
  38         /*
  39          * we fall back to GFP_DMA when the mask isn't all 1s,
  40          * so we can't guarantee allocations that must be
  41          * within a tighter range than GFP_DMA..
  42          */
  43         if (mask < DMA_BIT_MASK(24))
  44                 return 0;
  45
  46         return 1;
  47 }
  48
  49 static inline void plat_extra_sync_for_device(struct device *dev)
  50 {
  51         return;
  52 }
  53
  54 static inline int plat_dma_mapping_error(struct device *dev,
  55                                          dma_addr_t dma_addr)
  56 {
  57         return 0;
  58 }
  59
  60 static inline int plat_device_is_coherent(struct device *dev)
  61 {
  62         return 0;
  63 }
  64
  65 #endif /* __ASM_MACH_JAZZ_DMA_COHERENCE_H */