From: Eric Seppanen <eds@reric.net>
To: linuxppc-embedded@lists.linuxppc.org
Subject: cache control functions
Date: Wed, 12 Mar 2003 13:02:14 -0600 [thread overview]
Message-ID: <20030312130214.A7123@reric.net> (raw)
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
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next reply other threads:[~2003-03-12 19:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-12 19:02 Eric Seppanen [this message]
2003-03-12 19:22 ` cache control functions Matt Porter
2003-03-12 21:12 ` ramdisk source Prakash kanthi
2003-03-12 21:41 ` Wolfgang Denk
2003-03-19 6:26 ` Kenal Panic Kamaraj P
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