dma-coherence.h

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2006  Ralf Baechle <[email protected]>
 *
 */
#ifndef __ASM_MACH_IP27_DMA_COHERENCE_H
#define __ASM_MACH_IP27_DMA_COHERENCE_H

#include <asm/pci/bridge.h>

#define pdev_to_baddr(pdev, addr) \
    (BRIDGE_CONTROLLER(pdev->bus)->baddr + (addr))
#define dev_to_baddr(dev, addr) \
    pdev_to_baddr(to_pci_dev(dev), (addr))

struct device;

static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
    size_t size)
{
    dma_addr_t pa = dev_to_baddr(dev, virt_to_phys(addr));

    return pa;
}

static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
    struct page *page)
{
    dma_addr_t pa = dev_to_baddr(dev, page_to_phys(page));

    return pa;
}

static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
    dma_addr_t dma_addr)
{
    return dma_addr & ~(0xffUL << 56);
}

static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
    size_t size, enum dma_data_direction direction)
{
}

static inline int plat_dma_supported(struct device *dev, u64 mask)
{
    /*
     * we fall back to GFP_DMA when the mask isn't all 1s,
     * so we can't guarantee allocations that must be
     * within a tighter range than GFP_DMA..
     */
    if (mask < DMA_BIT_MASK(24))
        return 0;

    return 1;
}

static inline void plat_extra_sync_for_device(struct device *dev)
{
}

static inline int plat_dma_mapping_error(struct device *dev,
                     dma_addr_t dma_addr)
{
    return 0;
}

static inline int plat_device_is_coherent(struct device *dev)
{
    return 1;       /* IP27 non-cohernet mode is unsupported */
}

#endif /* __ASM_MACH_IP27_DMA_COHERENCE_H */