Tejun Heo wrote:
IIRC, Kevin's platform can't do any MMIO. Also, although sata_sil can be made to use 32-bit address space exclusively, I think having PIO access in the meantime can be helpful to many newer ATI mips platforms out there. Please note that w/ ioread/write change, the modified code is isolated into init_one(), so the added complexity is small.
Having PIO but not MMIO is _highly_ irregular, especially for non-x86 platforms. MMIO is much more common because it is easier to implement in hardware than PIO.
As an aside: We should add a 32-bit variant of ->data_xfer hooks, and use where appropriate.
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