https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 0e81a8ae37687845f7cdfa2adce14ea6a5f1dd34 authored by Linus Torvalds on 01 April 2008, 19:44:26 UTC
Linux 2.6.25-rc8
Linux 2.6.25-rc8
Tip revision: 0e81a8a
pmtimer_64.c
/* Ported over from i386 by AK, original copyright was:
*
* (C) Dominik Brodowski <linux@brodo.de> 2003
*
* Driver to use the Power Management Timer (PMTMR) available in some
* southbridges as primary timing source for the Linux kernel.
*
* Based on parts of linux/drivers/acpi/hardware/hwtimer.c, timer_pit.c,
* timer_hpet.c, and on Arjan van de Ven's implementation for 2.4.
*
* This file is licensed under the GPL v2.
*
* Dropped all the hardware bug workarounds for now. Hopefully they
* are not needed on 64bit chipsets.
*/
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/init.h>
#include <linux/cpumask.h>
#include <linux/acpi_pmtmr.h>
#include <asm/io.h>
#include <asm/proto.h>
#include <asm/msr.h>
#include <asm/vsyscall.h>
static inline u32 cyc2us(u32 cycles)
{
/* The Power Management Timer ticks at 3.579545 ticks per microsecond.
* 1 / PM_TIMER_FREQUENCY == 0.27936511 =~ 286/1024 [error: 0.024%]
*
* Even with HZ = 100, delta is at maximum 35796 ticks, so it can
* easily be multiplied with 286 (=0x11E) without having to fear
* u32 overflows.
*/
cycles *= 286;
return (cycles >> 10);
}
static unsigned pmtimer_wait_tick(void)
{
u32 a, b;
for (a = b = inl(pmtmr_ioport) & ACPI_PM_MASK;
a == b;
b = inl(pmtmr_ioport) & ACPI_PM_MASK)
cpu_relax();
return b;
}
/* note: wait time is rounded up to one tick */
void pmtimer_wait(unsigned us)
{
u32 a, b;
a = pmtimer_wait_tick();
do {
b = inl(pmtmr_ioport);
cpu_relax();
} while (cyc2us(b - a) < us);
}
static int __init nopmtimer_setup(char *s)
{
pmtmr_ioport = 0;
return 1;
}
__setup("nopmtimer", nopmtimer_setup);