arch/mips/include/asm/mach-loongson/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, 07  Ralf Baechle <ralf@linux-mips.org>
   7  * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
   8  * Author: Fuxin Zhang, zhangfx@lemote.com
   9  *
  10  */
  11 #ifndef __ASM_MACH_LOONGSON_DMA_COHERENCE_H
  12 #define __ASM_MACH_LOONGSON_DMA_COHERENCE_H
  13
  14 struct device;
  15
  16 static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
  17                                           size_t size)
  18 {
  19         return virt_to_phys(addr) | 0x80000000;
  20 }
  21
  22 static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
  23                                                struct page *page)
  24 {
  25         return page_to_phys(page) | 0x80000000;
  26 }
  27
  28 static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
  29         dma_addr_t dma_addr)
  30 {
  31         return dma_addr & 0x7fffffff;
  32 }
  33
  34 static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
  35         size_t size, enum dma_data_direction direction)
  36 {
  37 }
  38
  39 static inline int plat_dma_supported(struct device *dev, u64 mask)
  40 {
  41         /*
  42          * we fall back to GFP_DMA when the mask isn't all 1s,
  43          * so we can't guarantee allocations that must be
  44          * within a tighter range than GFP_DMA..
  45          */
  46         if (mask < DMA_BIT_MASK(24))
  47                 return 0;
  48
  49         return 1;
  50 }
  51
  52 static inline void plat_extra_sync_for_device(struct device *dev)
  53 {
  54         return;
  55 }
  56
  57 static inline int plat_dma_mapping_error(struct device *dev,
  58                                          dma_addr_t dma_addr)
  59 {
  60         return 0;
  61 }
  62
  63 static inline int plat_device_is_coherent(struct device *dev)
  64 {
  65         return 0;
  66 }
  67
  68 #endif /* __ASM_MACH_LOONGSON_DMA_COHERENCE_H */