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(dma_addr_t dma_addr)
  37 {
  38         return dma_addr & ~(0xffUL << 56);
  39 }
  40
  41 static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr)
  42 {
  43 }
  44
  45 static inline int plat_dma_supported(struct device *dev, u64 mask)
  46 {
  47         /*
  48          * we fall back to GFP_DMA when the mask isn't all 1s,
  49          * so we can't guarantee allocations that must be
  50          * within a tighter range than GFP_DMA..
  51          */
  52         if (mask < DMA_BIT_MASK(24))
  53                 return 0;
  54
  55         return 1;
  56 }
  57
  58 static inline void plat_extra_sync_for_device(struct device *dev)
  59 {
  60         return;
  61 }
  62
  63 static inline int plat_dma_mapping_error(struct device *dev,
  64                                          dma_addr_t dma_addr)
  65 {
  66         return 0;
  67 }
  68
  69 static inline int plat_device_is_coherent(struct device *dev)
  70 {
  71         return 1;               /* IP27 non-cohernet mode is unsupported */
  72 }
  73
  74 #endif /* __ASM_MACH_IP27_DMA_COHERENCE_H */