LXR linux/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
  19struct device;
  20
  21static 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
  29static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
  30        struct page *page)
  31{
  32        dma_addr_t pa = dev_to_baddr(dev, page_to_phys(page));
  33
  34        return pa;
  35}
  36
  37static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
  38        dma_addr_t dma_addr)
  39{
  40        return dma_addr & ~(0xffUL << 56);
  41}
  42
  43static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
  44        size_t size, enum dma_data_direction direction)
  45{
  46}
  47
  48static inline int plat_dma_supported(struct device *dev, u64 mask)
  49{
  50        /*
  51         * we fall back to GFP_DMA when the mask isn't all 1s,
  52         * so we can't guarantee allocations that must be
  53         * within a tighter range than GFP_DMA..
  54         */
  55        if (mask < DMA_BIT_MASK(24))
  56                return 0;
  57
  58        return 1;
  59}
  60
  61static inline void plat_extra_sync_for_device(struct device *dev)
  62{
  63        return;
  64}
  65
  66static inline int plat_dma_mapping_error(struct device *dev,
  67                                         dma_addr_t dma_addr)
  68{
  69        return 0;
  70}
  71
  72static inline int plat_device_is_coherent(struct device *dev)
  73{
  74        return 1;               /* IP27 non-cohernet mode is unsupported */
  75}
  76
  77#endif /* __ASM_MACH_IP27_DMA_COHERENCE_H */
  78