mirror of
https://github.com/torvalds/linux.git
synced 2024-12-14 23:25:54 +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>
58 lines
1022 B
C
58 lines
1022 B
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
|
|
* Mostly copied from arch/x86/lib/delay.c
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/delay.h>
|
|
#include <asm/param.h>
|
|
|
|
void __delay(unsigned long loops)
|
|
{
|
|
asm volatile(
|
|
"test %0,%0\n"
|
|
"jz 3f\n"
|
|
"jmp 1f\n"
|
|
|
|
".align 16\n"
|
|
"1: jmp 2f\n"
|
|
|
|
".align 16\n"
|
|
"2: dec %0\n"
|
|
" jnz 2b\n"
|
|
"3: dec %0\n"
|
|
|
|
: /* we don't need output */
|
|
: "a" (loops)
|
|
);
|
|
}
|
|
EXPORT_SYMBOL(__delay);
|
|
|
|
inline void __const_udelay(unsigned long xloops)
|
|
{
|
|
int d0;
|
|
|
|
xloops *= 4;
|
|
asm("mull %%edx"
|
|
: "=d" (xloops), "=&a" (d0)
|
|
: "1" (xloops), "0"
|
|
(loops_per_jiffy * (HZ/4)));
|
|
|
|
__delay(++xloops);
|
|
}
|
|
EXPORT_SYMBOL(__const_udelay);
|
|
|
|
void __udelay(unsigned long usecs)
|
|
{
|
|
__const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
|
|
}
|
|
EXPORT_SYMBOL(__udelay);
|
|
|
|
void __ndelay(unsigned long nsecs)
|
|
{
|
|
__const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
|
|
}
|
|
EXPORT_SYMBOL(__ndelay);
|