mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
59 lines
1 KiB
ArmAsm
59 lines
1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* linux/arch/arm/lib/delay.S
|
|
*
|
|
* Copyright (C) 1995, 1996 Russell King
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/delay.h>
|
|
|
|
.text
|
|
|
|
.LC0: .word loops_per_jiffy
|
|
.LC1: .word UDELAY_MULT
|
|
|
|
/*
|
|
* loops = r0 * HZ * loops_per_jiffy / 1000000
|
|
*
|
|
* r0 <= 2000
|
|
* HZ <= 1000
|
|
*/
|
|
|
|
ENTRY(__loop_udelay)
|
|
ldr r2, .LC1
|
|
mul r0, r2, r0 @ r0 = delay_us * UDELAY_MULT
|
|
ENTRY(__loop_const_udelay) @ 0 <= r0 <= 0xfffffaf0
|
|
ldr r2, .LC0
|
|
ldr r2, [r2]
|
|
umull r1, r0, r2, r0 @ r0-r1 = r0 * loops_per_jiffy
|
|
adds r1, r1, #0xffffffff @ rounding up ...
|
|
adcs r0, r0, r0 @ and right shift by 31
|
|
reteq lr
|
|
|
|
.align 3
|
|
|
|
@ Delay routine
|
|
ENTRY(__loop_delay)
|
|
subs r0, r0, #1
|
|
#if 0
|
|
retls lr
|
|
subs r0, r0, #1
|
|
retls lr
|
|
subs r0, r0, #1
|
|
retls lr
|
|
subs r0, r0, #1
|
|
retls lr
|
|
subs r0, r0, #1
|
|
retls lr
|
|
subs r0, r0, #1
|
|
retls lr
|
|
subs r0, r0, #1
|
|
retls lr
|
|
subs r0, r0, #1
|
|
#endif
|
|
bhi __loop_delay
|
|
ret lr
|
|
ENDPROC(__loop_udelay)
|
|
ENDPROC(__loop_const_udelay)
|
|
ENDPROC(__loop_delay)
|