From: Thomas Kleffel <tk@maintech.de>

this patch enables ide_cs to access CF-cards via their common memory
rather than via their IO space.

Signed-off-by: Thomas Kleffel <tk@maintech.de>
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This patch is against 2.6.17-rc3

The reason why this patch makes sense is that it is pretty easy to build
a CF-Interface out of a simple address/data-bus if you only use common
and attribute memory. Adding the capability to access IO space makes
things more complicated.

If you just want to use CF-Storage cards, access to common and attribute
memory is enough as the IDE registers are available there, as well.

I have submitted a patch to RMK which enables the AT91RM9200's CF
interface to work in that mode.

I made some changes based on the feedback from Alan Cox and Iain Barker.

The window size was changed from 16 to 0 (autodetect) on suggestion from
Iain Barker. 16 didn't work with one of his cards.

ide_cs was converted from outb to iowrite8 on suggestion from David Vrabel.

Thomas