arch/mips/include/asm/mach-ip27/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  *
   8  */
   9 #ifndef __ASM_MACH_IP27_DMA_COHERENCE_H
  10 #define __ASM_MACH_IP27_DMA_COHERENCE_H
  11
  12 #include <asm/pci/bridge.h>
  13
  14 #define pdev_to_baddr(pdev, addr) \
  15         (BRIDGE_CONTROLLER(pdev->bus)->baddr + (addr))
  16 #define dev_to_baddr(dev, addr) \
  17         pdev_to_baddr(to_pci_dev(dev), (addr))
  18
  19 struct device;
  20
  21 static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
  22         size_t size)
  23 {
  24         dma_addr_t pa = dev_to_baddr(dev, virt_to_phys(addr));
  25
  26         return pa;
  27 }
  28
  29 static dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)
  30 {
  31         dma_addr_t pa = dev_to_baddr(dev, page_to_phys(page));
  32
  33         return pa;
  34 }
  35
  36 static unsigned long plat_dma_addr_to_phys(struct device *dev,
  37         dma_addr_t dma_addr)
  38 {
  39         return dma_addr & ~(0xffUL << 56);
  40 }
  41
  42 static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
  43         size_t size, enum dma_data_direction direction)
  44 {
  45 }
  46
  47 static inline int plat_dma_supported(struct device *dev, u64 mask)
  48 {
  49         /*
  50          * we fall back to GFP_DMA when the mask isn't all 1s,
  51          * so we can't guarantee allocations that must be
  52          * within a tighter range than GFP_DMA..
  53          */
  54         if (mask < DMA_BIT_MASK(24))
  55                 return 0;
  56
  57         return 1;
  58 }
  59
  60 static inline void plat_extra_sync_for_device(struct device *dev)
  61 {
  62         return;
  63 }
  64
  65 static inline int plat_dma_mapping_error(struct device *dev,
  66                                          dma_addr_t dma_addr)
  67 {
  68         return 0;
  69 }
  70
  71 static inline int plat_device_is_coherent(struct device *dev)
  72 {
  73         return 1;               /* IP27 non-cohernet mode is unsupported */
  74 }
  75
  76 #endif /* __ASM_MACH_IP27_DMA_COHERENCE_H */