of/address: merge of_iomap()

Merge common code between Microblaze and PowerPC.  This patch creates
new of_address.h and address.c files to containing address translation
and mapping routines.  First routine to be moved it of_iomap()

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Michal Simek <monstr@monstr.eu>
CC: Stephen Rothwell <sfr@canb.auug.org.au>
diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h
index 10d5ee5..0abe379 100644
--- a/arch/powerpc/include/asm/prom.h
+++ b/arch/powerpc/include/asm/prom.h
@@ -18,6 +18,7 @@
  */
 #include <linux/types.h>
 #include <linux/of_fdt.h>
+#include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/proc_fs.h>
 #include <linux/platform_device.h>
@@ -119,14 +120,5 @@
 struct pci_dev;
 extern int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq);
 
-/**
- * of_iomap - Maps the memory mapped IO for a given device_node
- * @device:	the device whose io range will be mapped
- * @index:	index of the io range
- *
- * Returns a pointer to the mapped memory
- */
-extern void __iomem *of_iomap(struct device_node *device, int index);
-
 #endif /* __KERNEL__ */
 #endif /* _POWERPC_PROM_H */