linux/arch/unicore32/lib/delay.S
Thomas Gleixner d2912cb15b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
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>
2019-06-19 17:09:55 +02:00

49 lines
940 B
ArmAsm

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* linux/arch/unicore32/lib/delay.S
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*/
#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)
ldw r2, .LC1
mul r0, r2, r0
ENTRY(__const_udelay) @ 0 <= r0 <= 0x7fffff06
ldw r2, .LC0
ldw r2, [r2] @ max = 0x01ffffff
mov r0, r0 >> #14 @ max = 0x0001ffff
mov r2, r2 >> #10 @ max = 0x00007fff
mul r0, r2, r0 @ max = 2^32-1
mov.a r0, r0 >> #6
cmoveq pc, lr
/*
* loops = r0 * HZ * loops_per_jiffy / 1000000
*
* Oh, if only we had a cycle counter...
*/
@ Delay routine
ENTRY(__delay)
sub.a r0, r0, #2
bua __delay
mov pc, lr
ENDPROC(__udelay)
ENDPROC(__const_udelay)
ENDPROC(__delay)