m68k: merge and clean up delay.h files

The real difference between the mmu and non-mmu varients of the delay.h
files has nothing to do with having an mmu or not. It is processor family
differences that means slightly different code. Merge the delay_mm.h and
delay_no.h files back into a single file.

The primarly difference we need to deal with is whether the processor
supports a 32bit * 32bit -> 64bit multiply. Without it we need to do some
shift scaling as well as use a 32bit * 32bit -> 32bit multiply. If building
for a multi-CPU type kernel then we must use the simpler mult/shift scaling.

This version of delay code allows the CPU32 family to use a 64bit mul,
since it supports this instruction, the old code did not.

The changes use macros where appropriate to try and optimize constant sized
udelay times. And it removes the use of a fixed lib function for the non-mmu
case. Code size on typical kernel configurations is similar, or only larger
by a few tens of bytes.

Also removed the unused muldiv() code from delay_mm.h.

Build and run tested on ColdFire and ARAnyM. Build tested only on 68328
and 68360 (CPU32).

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

2 files changed, 1 insertions, 22 deletions

diff --git a/arch/m68k/lib/Makefile b/arch/m68k/lib/Makefile
index df421e5..1a1bd90 100644
--- a/arch/m68k/lib/Makefile
+++ b/arch/m68k/lib/Makefile
@@ -9,6 +9,6 @@ lib-y	:= ashldi3.o ashrdi3.o lshrdi3.o muldi3.o \
 ifdef CONFIG_MMU
 lib-y	+= string.o uaccess.o checksum_mm.o
 else
-lib-y	+= mulsi3.o divsi3.o udivsi3.o modsi3.o umodsi3.o delay.o checksum_no.o
+lib-y	+= mulsi3.o divsi3.o udivsi3.o modsi3.o umodsi3.o checksum_no.o
 endif
 
diff --git a/arch/m68k/lib/delay.c b/arch/m68k/lib/delay.c
deleted file mode 100644
index 5bd5472..0000000
--- a/arch/m68k/lib/delay.c
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- *	arch/m68knommu/lib/delay.c
- *
- *	(C) Copyright 2004, Greg Ungerer <gerg@snapgear.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <asm/param.h>
-#include <asm/delay.h>
-
-EXPORT_SYMBOL(udelay);
-
-void udelay(unsigned long usecs)
-{
-	_udelay(usecs);
-}
-