One comment: you could move the DMA related functions and registers to
sparc32_dma.c because it seems reasonnable that the DMA stuff was really
implemented outside of the cs4231 chip (I believe the same chip was used in
some PC cards with an ISA based DMA).
I had thought about that, but the CS and DMA registers are located in nearby
addresses. Cleanest solution from the driver point of view would be that
Qemu handled the case correctly where several drivers register
non-overlapping memory areas of less than one page size within the same
page. That way the DMA controller could reside in sparc32_dma.c and not know
anything about CS registers and vice versa.
Looks like the PC cards were called Windows Sound System compatible and
there were several manufacturers in the early '90s.
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