target/linux/atheros/files/include/asm-mips/mach-atheros/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  * Copyright (C) 2007  Felix Fietkau <nbd@openwrt.org>
   8  *
   9  */
  10 #ifndef __ASM_MACH_GENERIC_DMA_COHERENCE_H
  11 #define __ASM_MACH_GENERIC_DMA_COHERENCE_H
  12
  13 #if 0
  14 #define PCI_DMA_OFFSET  0x20000000
  15 #else
  16 #define PCI_DMA_OFFSET  0x00000000
  17 #endif
  18
  19 struct device;
  20
  21 static dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size)
  22 {
  23         return virt_to_phys(addr) + (dev != NULL ? PCI_DMA_OFFSET : 0);
  24 }
  25
  26 static dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)
  27 {
  28         return page_to_phys(page) + (dev != NULL ? PCI_DMA_OFFSET : 0);
  29 }
  30
  31 static unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)
  32 {
  33         return (dma_addr > PCI_DMA_OFFSET ? dma_addr - PCI_DMA_OFFSET : dma_addr);
  34 }
  35
  36 static void plat_unmap_dma_mem(dma_addr_t dma_addr)
  37 {
  38 }
  39
  40 static inline int plat_device_is_coherent(struct device *dev)
  41 {
  42         return 0;
  43 }
  44
  45 #endif /* __ASM_MACH_GENERIC_DMA_COHERENCE_H */