arch/mips/include/asm/mach-loongson64/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_LOONGSON64_DMA_COHERENCE_H
  12 #define __ASM_MACH_LOONGSON64_DMA_COHERENCE_H
  13
  14 #ifdef CONFIG_SWIOTLB
  15 #include <linux/swiotlb.h>
  16 #endif
  17
  18 struct device;
  19
  20 extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
  21 extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
  22 static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
  23                                           size_t size)
  24 {
  25 #ifdef CONFIG_CPU_LOONGSON3
  26         return phys_to_dma(dev, virt_to_phys(addr));
  27 #else
  28         return virt_to_phys(addr) | 0x80000000;
  29 #endif
  30 }
  31
  32 static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
  33                                                struct page *page)
  34 {
  35 #ifdef CONFIG_CPU_LOONGSON3
  36         return phys_to_dma(dev, page_to_phys(page));
  37 #else
  38         return page_to_phys(page) | 0x80000000;
  39 #endif
  40 }
  41
  42 static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
  43         dma_addr_t dma_addr)
  44 {
  45 #if defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_64BIT)
  46         return dma_to_phys(dev, dma_addr);
  47 #elif defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
  48         return (dma_addr > 0x8fffffff) ? dma_addr : (dma_addr & 0x0fffffff);
  49 #else
  50         return dma_addr & 0x7fffffff;
  51 #endif
  52 }
  53
  54 static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
  55         size_t size, enum dma_data_direction direction)
  56 {
  57 }
  58
  59 static inline int plat_dma_supported(struct device *dev, u64 mask)
  60 {
  61         /*
  62          * we fall back to GFP_DMA when the mask isn't all 1s,
  63          * so we can't guarantee allocations that must be
  64          * within a tighter range than GFP_DMA..
  65          */
  66         if (mask < DMA_BIT_MASK(24))
  67                 return 0;
  68
  69         return 1;
  70 }
  71
  72 static inline int plat_device_is_coherent(struct device *dev)
  73 {
  74 #ifdef CONFIG_DMA_NONCOHERENT
  75         return 0;
  76 #else
  77         return 1;
  78 #endif /* CONFIG_DMA_NONCOHERENT */
  79 }
  80
  81 static inline void plat_post_dma_flush(struct device *dev)
  82 {
  83 }
  84
  85 #endif /* __ASM_MACH_LOONGSON64_DMA_COHERENCE_H */