cache control functions
Eric Seppanen
eds at reric.net
Thu Mar 13 06:02:14 EST 2003
I'm writing a driver module, for a pci device that lives in a 405GPr
based system. I notice that the 405 doesn't seem to have a consistent
cache after the pci device busmasters a bunch of data into SDRAM (or
before it pulls data out), so I think the thing I'm supposed to do is
call (depending on direction) one of these:
invalidate_dcache_range
clean_dcache_range
flush_dcache_range
or what seems to be the equivalent, but cross-platform names
dma_cache_inv
dma_cache_wback
dma_cache_wback_inv
(these are just macros calling the first three; include/asm-ppc/io.h)
But invalidate_dcache_range and clean_dcache_range are never exported,
so they're unavailable to modules. (and means that dma_cache_inv and
dma_cache_wback are unavailable as well.)
Is this intentional or an oversight? I can't see how I can write a
driver for a busmaster device (that will work on a 405) without them.
Eric
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