m68k: fix ioremapping for internal ColdFire peripherals

The ColdFire SoC internal peripherals are mapped into virtual address
space using the ACR registers of the cache control unit. This means we
are using a 1:1 physical:virtual mapping for them that does not rely on
page table mappings. We can quickly determine if we are accessing an
internal peripheral device given the physical or vitrual address using
the same range check.

The implications of this mapping is that an ioremap should return the
physical address as the virtual mapping __iomem cookie as well. So fix
ioremap() to deal with this on ColdFire. Of course you need to take
care of this in the iounmap() path as well.
Reported-by: Angelo Dureghello <angelo@sysam.it>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
Reviewed-by: Angelo Dureghello <angelo@sysam.it>
Tested-by: Angelo Dureghello <angelo@sysam.it>

arch/m68k/mm/kmap.c

@@ -125,6 +125,10 @@ void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cachefla
 			return (void __iomem *)physaddr;
 	}
 #endif
+#ifdef CONFIG_COLDFIRE
+	if (__cf_internalio(physaddr))
+		return (void __iomem *) physaddr;
+#endif
 
 #ifdef DEBUG
 	printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag);
@@ -235,6 +239,10 @@ void iounmap(void __iomem *addr)
 	     ((unsigned long)addr > 0x60000000)))
 			free_io_area((__force void *)addr);
 #else
+#ifdef CONFIG_COLDFIRE
+	if (cf_internalio(addr))
+		return;
+#endif
 	free_io_area((__force void *)addr);
 #endif
 }