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, 11 insertions, 6 deletions

diff --git a/arch/sh/kernel/machvec.c b/arch/sh/kernel/machvec.c
index 85cfaf916fdc..9f9bb63616ad 100644
--- a/arch/sh/kernel/machvec.c
+++ b/arch/sh/kernel/machvec.c
@@ -118,6 +118,14 @@ void __init sh_mv_setup(void)
                 sh_mv.mv_##elem = generic_##elem; \
 } while (0)
 
+#ifdef CONFIG_HAS_IOPORT
+
+#ifdef P2SEG
+        __set_io_port_base(P2SEG);
+#else
+        __set_io_port_base(0);
+#endif
+
         mv_set(inb);    mv_set(inw);    mv_set(inl);
         mv_set(outb);   mv_set(outw);   mv_set(outl);
 
@@ -129,16 +137,13 @@ void __init sh_mv_setup(void)
 
         mv_set(ioport_map);
         mv_set(ioport_unmap);
+
+#endif
+
         mv_set(irq_demux);
         mv_set(mode_pins);
         mv_set(mem_init);
 
         if (!sh_mv.mv_nr_irqs)
                 sh_mv.mv_nr_irqs = NR_IRQS;
-
-#ifdef P2SEG
-        __set_io_port_base(P2SEG);
-#else
-        __set_io_port_base(0);
-#endif
 }