arch/mips/include/asm/mach-bmips/dma-coherence.h

   1 /*
   2  * Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org>
   3  * Copyright (C) 2009 Broadcom Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #ifndef __ASM_MACH_BMIPS_DMA_COHERENCE_H
  16 #define __ASM_MACH_BMIPS_DMA_COHERENCE_H
  17
  18 #include <asm/bmips.h>
  19 #include <asm/cpu-type.h>
  20 #include <asm/cpu.h>
  21
  22 struct device;
  23
  24 extern dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size);
  25 extern dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page);
  26 extern unsigned long plat_dma_addr_to_phys(struct device *dev,
  27         dma_addr_t dma_addr);
  28
  29 static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
  30         size_t size, enum dma_data_direction direction)
  31 {
  32 }
  33
  34 static inline int plat_dma_supported(struct device *dev, u64 mask)
  35 {
  36         /*
  37          * we fall back to GFP_DMA when the mask isn't all 1s,
  38          * so we can't guarantee allocations that must be
  39          * within a tighter range than GFP_DMA..
  40          */
  41         if (mask < DMA_BIT_MASK(24))
  42                 return 0;
  43
  44         return 1;
  45 }
  46
  47 static inline int plat_device_is_coherent(struct device *dev)
  48 {
  49         return 0;
  50 }
  51
  52 #define plat_post_dma_flush     bmips_post_dma_flush
  53
  54 #endif /* __ASM_MACH_BMIPS_DMA_COHERENCE_H */