target/linux/atheros/files-2.6.28/arch/mips/include/asm/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 #define PCI_DMA_OFFSET  0x20000000
  14
  15 struct device;
  16
  17 static dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size)
  18 {
  19         return virt_to_phys(addr) + (dev != NULL ? PCI_DMA_OFFSET : 0);
  20 }
  21
  22 static dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)
  23 {
  24         return page_to_phys(page) + (dev != NULL ? PCI_DMA_OFFSET : 0);
  25 }
  26
  27 static unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)
  28 {
  29         return (dma_addr > PCI_DMA_OFFSET ? dma_addr - PCI_DMA_OFFSET : dma_addr);
  30 }
  31
  32 static void plat_unmap_dma_mem(dma_addr_t dma_addr)
  33 {
  34 }
  35
  36 static inline int plat_device_is_coherent(struct device *dev)
  37 {
  38         return 0;
  39 }
  40
  41 #endif /* __ASM_MACH_GENERIC_DMA_COHERENCE_H */