mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 05:14:38 +00:00
941e492bdb
- All implementations can be __devinit - The function prototypes were in asm/timex.h but they all must be the same, so create a single declaration in linux/timex.h. - uninline the sparc64 version to match the other architectures - Don't bother #defining ARCH_HAS_READ_CURRENT_TIMER to a particular value. [ezk@cs.sunysb.edu: fix build] Cc: "David S. Miller" <davem@davemloft.net> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/*
|
|
* Precise Delay Loops for avr32
|
|
*
|
|
* Copyright (C) 1993 Linus Torvalds
|
|
* Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
|
|
* Copyright (C) 2005-2006 Atmel Corporation
|
|
*
|
|
* 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/delay.h>
|
|
#include <linux/module.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/param.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm/sysreg.h>
|
|
|
|
int __devinit read_current_timer(unsigned long *timer_value)
|
|
{
|
|
*timer_value = sysreg_read(COUNT);
|
|
return 0;
|
|
}
|
|
|
|
void __delay(unsigned long loops)
|
|
{
|
|
unsigned bclock, now;
|
|
|
|
bclock = sysreg_read(COUNT);
|
|
do {
|
|
now = sysreg_read(COUNT);
|
|
} while ((now - bclock) < loops);
|
|
}
|
|
|
|
inline void __const_udelay(unsigned long xloops)
|
|
{
|
|
unsigned long long loops;
|
|
|
|
asm("mulu.d %0, %1, %2"
|
|
: "=r"(loops)
|
|
: "r"(current_cpu_data.loops_per_jiffy * HZ), "r"(xloops));
|
|
__delay(loops >> 32);
|
|
}
|
|
|
|
void __udelay(unsigned long usecs)
|
|
{
|
|
__const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
|
|
}
|
|
|
|
void __ndelay(unsigned long nsecs)
|
|
{
|
|
__const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
|
|
}
|