[PATCH] pasemi: Fix coherent_dma_mask for dma engine

[Darren Stevens]

    Commit 817820b0226a ("powerpc/iommu: Support "hybrid" iommu/direct DMA
    ops for coherent_mask < dma_mask) adds a check of coherent_dma_mask
    for dma allocations.
    Unfortunately current PASemi code does not set this value for the DMA
    engine, which ends up with the default value of 0xffffffff, the result 
    is on a PASemi system with >2Gb ram and iommu enabled the the onboard 
    ethernet stops working due to an inability to allocate memory.
    Add an initialisation to pci_dma_dev_setup_pasemi()
  
    Signed-off-by: Darren Stevens <darren at stevens-zone.net>
  
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