linux.git/include/asm-sh/system_32.h, branch v2.6.26 Linux kernel source tree sh: trapped io support V2 2008-02-14T05:22:09+00:00 Magnus Damm magnus.damm@gmail.com 2008-02-07T11:18:21+00:00 e7cc9a7340b8ec018caa9eb1d035fdaef1f2fc51 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> 
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>
sh: Fix up switch_to() type casts. 2008-01-28T04:19:00+00:00 Paul Mundt lethal@linux-sh.org 2007-12-17T01:52:37+00:00 830626caf8570675a15bcc9ec46fcb5bfbc71b0d Signed-off-by: Paul Mundt <lethal@linux-sh.org> 
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
sh: Preparation for uncached jumps through PMB. 2008-01-28T04:18:59+00:00 Stuart Menefy stuart.menefy@st.com 2007-11-30T08:06:36+00:00 cbaa118ecfd99fc5ed7adbd9c34a30e1c05e3c93 Presently most of the 29-bit physical parts do P1/P2 segmentation with a 1:1 cached/uncached mapping, jumping between the two to control the caching behaviour. This provides the basic infrastructure to maintain this behaviour on 32-bit physical parts that don't map P1/P2 at all, using a shiny new linker section and corresponding fixmap entry. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org> 
Presently most of the 29-bit physical parts do P1/P2 segmentation
with a 1:1 cached/uncached mapping, jumping between the two to
control the caching behaviour. This provides the basic infrastructure
to maintain this behaviour on 32-bit physical parts that don't map
P1/P2 at all, using a shiny new linker section and corresponding
fixmap entry.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
sh: Split out system.h in to _32 and _64 variants. 2008-01-28T04:18:42+00:00 Paul Mundt lethal@linux-sh.org 2007-11-10T10:46:31+00:00 a62a3861e0adfd2612372883b5b1fc05a5182796 Signed-off-by: Paul Mundt <lethal@linux-sh.org> 
Signed-off-by: Paul Mundt <lethal@linux-sh.org>