sh: support for platforms without PIO.

This extends some of the existing special casing for HAS_IOPORT
platforms and gets it to the point where platforms can begin to
conditionally select it.

The major changes here are that the PIO routines themselves go away
completely, including all of the machvec port mapping wrappers. With this
in place it's possible for any non-machvec abusing platform to disable
PIO completely. At present this is left as an opt-in until the abusers
are the odd ones out instead of the majority.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 0e318c905ee..1eef24d04bb 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -9,7 +9,7 @@ config SUPERH
         def_bool y
         select EMBEDDED
         select HAVE_CLK
-        select HAVE_IDE
+        select HAVE_IDE if HAS_IOPORT
         select HAVE_LMB
         select HAVE_OPROFILE
         select HAVE_GENERIC_DMA_COHERENT
@@ -174,6 +174,9 @@ config ARCH_HAS_DEFAULT_IDLE
 config ARCH_HAS_CPU_IDLE_WAIT
         def_bool y
 
+config NO_IOPORT
+        bool
+
 config IO_TRAPPED
         bool