[PATCH] ARM: 2752/1: disable ixp2000 PCI I/O software workaround on chips that don't need it

Patch from Lennert Buytenhek

The later ixp2000 models don't need the PCI I/O workaround that we
currently perform.  Add a config option to disable the workaround,
and panic on boot if a kernel without the workaround is booted on a
buggy chip.  As only pre-production ixp2000s need the workaround,
the default is for it not to be configured in.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Deepak Saxena
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/arm/mach-ixp2000/Kconfig b/arch/arm/mach-ixp2000/Kconfig
index 9361e05f6fa..ecb58d83478 100644
--- a/arch/arm/mach-ixp2000/Kconfig
+++ b/arch/arm/mach-ixp2000/Kconfig
@@ -54,6 +54,14 @@ config ARCH_IXDP2X01
         depends on ARCH_IXDP2401 || ARCH_IXDP2801
         default y       
 
+config IXP2000_SUPPORT_BROKEN_PCI_IO
+        bool "Support broken PCI I/O on older IXP2000s"
+        default y
+        help
+          Say 'N' here if you only intend to run your kernel on an
+          IXP2000 B0 or later model and do not need the PCI I/O
+          byteswap workaround.  Say 'Y' otherwise.
+
 endmenu
 
 endif