[PATCH] ide_cs: Make ide_cs work with the memory space of CF-Cards if IO space is not available (4rd revision)

[Thomas Kleffel (maintech GmbH)]

From: Thomas Kleffel <tk at 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 at maintech.de>
---

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.

Detection of slave drives works with mmio, now.

Thomas




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