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>

5 files changed, 37 insertions, 29 deletions

diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile
index 650b92f00ee..e25f3c69525 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -12,7 +12,7 @@ endif
 CFLAGS_REMOVE_return_address.o = -pg
 
 obj-y	:= clkdev.o debugtraps.o dma-nommu.o dumpstack.o 		\
-	   idle.o io.o io_generic.o irq.o				\
+	   idle.o io.o irq.o						\
 	   irq_$(BITS).o machvec.o nmi_debug.o process.o		\
 	   process_$(BITS).o ptrace_$(BITS).o				\
 	   reboot.o return_address.o					\
@@ -39,6 +39,7 @@ obj-$(CONFIG_DUMP_CODE)		+= disassemble.o
 obj-$(CONFIG_HIBERNATION)	+= swsusp.o
 obj-$(CONFIG_DWARF_UNWINDER)	+= dwarf.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o perf_callchain.o
+obj-$(CONFIG_HAS_IOPORT)	+= io_generic.o
 
 obj-$(CONFIG_HAVE_HW_BREAKPOINT)		+= hw_breakpoint.o
 obj-$(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)	+= localtimer.o
diff --git a/arch/sh/kernel/io.c b/arch/sh/kernel/io.c
index 4770c241c67..5c51b794ba2 100644
--- a/arch/sh/kernel/io.c
+++ b/arch/sh/kernel/io.c
@@ -112,25 +112,3 @@ void memset_io(volatile void __iomem *dst, int c, unsigned long count)
         }
 }
 EXPORT_SYMBOL(memset_io);
-
-#ifndef CONFIG_GENERIC_IOMAP
-
-void __iomem *ioport_map(unsigned long port, unsigned int nr)
-{
-	void __iomem *ret;
-
-	ret = __ioport_map_trapped(port, nr);
-	if (ret)
-		return ret;
-
-	return __ioport_map(port, nr);
-}
-EXPORT_SYMBOL(ioport_map);
-
-void ioport_unmap(void __iomem *addr)
-{
-	sh_mv.mv_ioport_unmap(addr);
-}
-EXPORT_SYMBOL(ioport_unmap);
-
-#endif /* CONFIG_GENERIC_IOMAP */
diff --git a/arch/sh/kernel/io_generic.c b/arch/sh/kernel/io_generic.c
index e1e1dbd1955..447d78f666f 100644
--- a/arch/sh/kernel/io_generic.c
+++ b/arch/sh/kernel/io_generic.c
@@ -158,3 +158,23 @@ void __iomem *generic_ioport_map(unsigned long addr, unsigned int size)
 void generic_ioport_unmap(void __iomem *addr)
 {
 }
+
+#ifndef CONFIG_GENERIC_IOMAP
+void __iomem *ioport_map(unsigned long port, unsigned int nr)
+{
+	void __iomem *ret;
+
+	ret = __ioport_map_trapped(port, nr);
+	if (ret)
+		return ret;
+
+	return __ioport_map(port, nr);
+}
+EXPORT_SYMBOL(ioport_map);
+
+void ioport_unmap(void __iomem *addr)
+{
+	sh_mv.mv_ioport_unmap(addr);
+}
+EXPORT_SYMBOL(ioport_unmap);
+#endif /* CONFIG_GENERIC_IOMAP */
diff --git a/arch/sh/kernel/io_trapped.c b/arch/sh/kernel/io_trapped.c
index 4a8bb4eeb8a..2947d2bd129 100644
--- a/arch/sh/kernel/io_trapped.c
+++ b/arch/sh/kernel/io_trapped.c
@@ -91,10 +91,14 @@ int register_trapped_io(struct trapped_io *tiop)
 	tiop->magic = IO_TRAPPED_MAGIC;
 	INIT_LIST_HEAD(&tiop->list);
 	spin_lock_irq(&trapped_lock);
+#ifdef CONFIG_HAS_IOPORT
 	if (flags & IORESOURCE_IO)
 		list_add(&tiop->list, &trapped_io);
+#endif
+#ifdef CONFIG_HAS_IOMEM
 	if (flags & IORESOURCE_MEM)
 		list_add(&tiop->list, &trapped_mem);
+#endif
 	spin_unlock_irq(&trapped_lock);
 
 	return 0;
diff --git a/arch/sh/kernel/machvec.c b/arch/sh/kernel/machvec.c
index 85cfaf916fd..9f9bb63616a 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
 }