Selectively include support for port I/O
This re-factors port IO to make it easier to omit it on certain
platforms that don't support it:
- Add a Kconfig variable, CONFIG_INTF_PORT_IO, which defaults to 'y'
for x86 and 'n' otherwise. ARM actually has <sys/io.h> which
declares inb/outb/etc, but we don't actually use it. We can select
it on an as-needed basis.
- Modify intf/io.c to only compile support for the raw port IO
interface if the Kconfig variable is defined (selected).
- Opportunistically move inclusion of <sys/io.h> to intf/io.c where
stuff that's defined in <sys/io.h> is used.
BUG=chromium:396422
BRANCH=none
TEST=emerge-mipsel-o32-generic mosys works
Change-Id: I4e0e4ef0b8add0b897e08bc7ab95637e8be85810
Reviewed-on: https://chromium-review.googlesource.com/209945
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
4 files changed
