edac: e752x: add dram scrubbing support
Add support to scrub DRAM using the e752x integrated memory scrubbing engine. The e7320/7520/e7525 chipsets support scrubbing at one rate while the i3100 chipset supports a normal and fast rate. A similar patch was originally sent back in 2008: http://sourceforge.net/mailarchive/forum.php?thread_name=1204835866.25206.70.camel@localhost.localdomain&forum_name=bluesmoke-devel This version has the following updates: - Use 16-bit PCI config cycles to access MCHSCRB register e7320/7520/e7525 docs say register is 16bits wide, i3100 says 8. I tested 16bits on the i3100 to be safe. - Recalcuate and round actual scrub rates The changes have been tested on an i3100-based board. Signed-off-by: Peter Tyser <ptyser@xes-inc.com> Signed-off-by: Doug Thompson <dougthompson@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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