tree 3076c2e0187657daed3054d511b62dc33a4c8f8b
parent 2b9ac7c15c0c5c9d6057b9e297dabaebd208ffe8
author Deepak Saxena <dsaxena@plexity.net> 1136494769 +0000
committer Russell King <rmk+kernel@arm.linux.org.uk> 1136494769 +0000

[ARM] 3226/1: IXP4xx runtime expansion bus window size configuration

Patch from Deepak Saxena

The expansion bus on the IXP46x NPU can be configured for either 32MiB or
16MiB windows and changing the configuration causes the base address for
each chip select for each region to change. Because of this, we cannot
hardcode the physical base as we currently do. This patch checks the
expansion bus configuration registers at runtime to determine the
appropriate window size. Note that this requires that the bootloader
already configured the device sizes appropriately, but I feel that is
valid assumption to make as the bootloader must configure and access
the flash window, the output display (LCD, LEDs, etc) window, and
other expansion bus devices.

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>