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 struct device;
  19
  20 extern dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size);
  21 extern dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page);
  22 extern unsigned long plat_dma_addr_to_phys(struct device *dev,
  23         dma_addr_t dma_addr);
  24
  25 static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
  26         size_t size, enum dma_data_direction direction)
  27 {
  28 }
  29
  30 static inline int plat_dma_supported(struct device *dev, u64 mask)
  31 {
  32         /*
  33          * we fall back to GFP_DMA when the mask isn't all 1s,
  34          * so we can't guarantee allocations that must be
  35          * within a tighter range than GFP_DMA..
  36          */
  37         if (mask < DMA_BIT_MASK(24))
  38                 return 0;
  39
  40         return 1;
  41 }
  42
  43 static inline int plat_device_is_coherent(struct device *dev)
  44 {
  45         return 0;
  46 }
  47
  48 #endif /* __ASM_MACH_BMIPS_DMA_COHERENCE_H */