7999d8d7a6
RETINSTR is a left-over from the days when we had 26-bit and 32-bit CPU support integrated into the same tree. Since this is no longer the case, we can now remove RETINSTR. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
63 lines
1.2 KiB
ArmAsm
63 lines
1.2 KiB
ArmAsm
/*
|
|
* linux/arch/arm/lib/delay.S
|
|
*
|
|
* Copyright (C) 1995, 1996 Russell King
|
|
*
|
|
* 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/linkage.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/param.h>
|
|
.text
|
|
|
|
.LC0: .word loops_per_jiffy
|
|
.LC1: .word (2199023*HZ)>>11
|
|
|
|
/*
|
|
* r0 <= 2000
|
|
* lpj <= 0x01ffffff (max. 3355 bogomips)
|
|
* HZ <= 1000
|
|
*/
|
|
|
|
ENTRY(__udelay)
|
|
ldr r2, .LC1
|
|
mul r0, r2, r0
|
|
ENTRY(__const_udelay) @ 0 <= r0 <= 0x7fffff06
|
|
ldr r2, .LC0
|
|
ldr r2, [r2] @ max = 0x01ffffff
|
|
mov r0, r0, lsr #14 @ max = 0x0001ffff
|
|
mov r2, r2, lsr #10 @ max = 0x00007fff
|
|
mul r0, r2, r0 @ max = 2^32-1
|
|
movs r0, r0, lsr #6
|
|
moveq pc, lr
|
|
|
|
/*
|
|
* loops = r0 * HZ * loops_per_jiffy / 1000000
|
|
*
|
|
* Oh, if only we had a cycle counter...
|
|
*/
|
|
|
|
@ Delay routine
|
|
ENTRY(__delay)
|
|
subs r0, r0, #1
|
|
#if 0
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
#endif
|
|
bhi __delay
|
|
mov pc, lr
|