m68k: merge the non-MMU and MMU versions of swab.h

It is trivial to merge the non-MMU and MMU versions of swab.h.
Without a single file "make headers_install" is broken for m68k
(since each of the sub-varients of swab.h are not installed).

Signed-off-by: Greg Ungerer <gerg@uclinux.org>

arch/m68k/include/asm/swab.h

@@ -1,5 +1,27 @@
-#ifdef __uClinux__
-#include "swab_no.h"
-#else
-#include "swab_mm.h"
+#ifndef _M68K_SWAB_H
+#define _M68K_SWAB_H
+
+#include <asm/types.h>
+#include <linux/compiler.h>
+
+#define __SWAB_64_THRU_32__
+
+#if defined (__mcfisaaplus__) || defined (__mcfisac__)
+static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
+{
+	__asm__("byterev %0" : "=d" (val) : "0" (val));
+	return val;
+}
+
+#define __arch_swab32 __arch_swab32
+#elif !defined(__uClinux__)
+
+static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
+{
+	__asm__("rolw #8,%0; swap %0; rolw #8,%0" : "=d" (val) : "0" (val));
+	return val;
+}
+#define __arch_swab32 __arch_swab32
 #endif
+
+#endif /* _M68K_SWAB_H */