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authorMagnus Damm <magnus.damm@gmail.com>2008-02-07 20:18:21 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-02-14 14:22:09 +0900
commite7cc9a7340b8ec018caa9eb1d035fdaef1f2fc51 (patch)
treea797888f8d3f95734288978351c33af3c965494c /arch/sh/Kconfig
parent2ade1a9b425c24037327197ea97db054395b536b (diff)
sh: trapped io support V2
The idea is that we want to get rid of the in/out/readb/writeb callbacks from the machvec and replace that with simple inline read and write operations to memory. Fast and simple for most hardware devices (think pci). Some devices require special treatment though - like 16-bit only CF devices - so we need to have some method to hook in callbacks. This patch makes it possible to add a per-device trap generating filter. This way we can get maximum performance of sane hardware - which doesn't need this filter - and crappy hardware works but gets punished by a performance hit. V2 changes things around a bit and replaces io access callbacks with a simple minimum_bus_width value. In the future we can add stride as well. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/Kconfig')
-rw-r--r--arch/sh/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 8398cf105a0..f61bf17db39 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -93,6 +93,9 @@ config ARCH_NO_VIRT_TO_BUS
config ARCH_SUPPORTS_AOUT
def_bool y
+config IO_TRAPPED
+ bool
+
source "init/Kconfig"
menu "System type"