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 #if defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
  32         return (dma_addr > 0x8fffffff) ? dma_addr : (dma_addr & 0x0fffffff);
  33 #else
  34         return dma_addr & 0x7fffffff;
  35 #endif
  36 }
  37
  38 static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
  39         size_t size, enum dma_data_direction direction)
  40 {
  41 }
  42
  43 static inline int plat_dma_supported(struct device *dev, u64 mask)
  44 {
  45         /*
  46          * we fall back to GFP_DMA when the mask isn't all 1s,
  47          * so we can't guarantee allocations that must be
  48          * within a tighter range than GFP_DMA..
  49          */
  50         if (mask < DMA_BIT_MASK(24))
  51                 return 0;
  52
  53         return 1;
  54 }
  55
  56 static inline int plat_device_is_coherent(struct device *dev)
  57 {
  58         return 0;
  59 }
  60
  61 #endif /* __ASM_MACH_LOONGSON_DMA_COHERENCE_H */