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    SubjectRe: [PATCH 07/19] OpenRISC: DMA
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    On Sunday 19 June 2011 13:43:33 Jonas Bonn wrote:
    >
    > Simple DMA implementation. There's some work to do here, but
    > this allows for allocation of coherent memory (simply uncached) for DMA
    > operations.
    >
    > Signed-off-by: Jonas Bonn <jonas@southpole.se>
    > ---
    > arch/openrisc/include/asm/dma-mapping.h | 129 ++++++++++++++++++++++++++
    > arch/openrisc/kernel/dma.c | 152 +++++++++++++++++++++++++++++++
    > 2 files changed, 281 insertions(+), 0 deletions(-)
    > create mode 100644 arch/openrisc/include/asm/dma-mapping.h
    > create mode 100644 arch/openrisc/kernel/dma.c

    If you don't have an IOMMU or the need for swiotlb, you can probably eliminate
    the use of dma_map_ops and just provide the simple implementation.

    For the operations that you have not implemented properly, I would leave
    a forward-declaration but remove the implementation that causes a runtime
    error, so you turn that into a link time error.

    Arnd


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