mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 18:24:14 +08:00
574c44fa8f
Now that clocksource.archdata is available, use it for ia64-specific code. Cc: Clemens Ladisch <clemens@ladisch.de> Cc: linux-ia64@vger.kernel.org Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: John Stultz <johnstul@us.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andy Lutomirski <luto@mit.edu> Link: http://lkml.kernel.org/r/d31de0ee0842a0e322fb6441571c2b0adb323fa2.1310563276.git.luto@mit.edu Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
|
|
* linux/arch/ia64/sn/kernel/sn2/timer.c
|
|
*
|
|
* Copyright (C) 2003 Silicon Graphics, Inc.
|
|
* Copyright (C) 2003 Hewlett-Packard Co
|
|
* David Mosberger <davidm@hpl.hp.com>: updated for new timer-interpolation infrastructure
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/time.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/clocksource.h>
|
|
|
|
#include <asm/hw_irq.h>
|
|
#include <asm/system.h>
|
|
#include <asm/timex.h>
|
|
|
|
#include <asm/sn/leds.h>
|
|
#include <asm/sn/shub_mmr.h>
|
|
#include <asm/sn/clksupport.h>
|
|
|
|
extern unsigned long sn_rtc_cycles_per_second;
|
|
|
|
static cycle_t read_sn2(struct clocksource *cs)
|
|
{
|
|
return (cycle_t)readq(RTC_COUNTER_ADDR);
|
|
}
|
|
|
|
static struct clocksource clocksource_sn2 = {
|
|
.name = "sn2_rtc",
|
|
.rating = 450,
|
|
.read = read_sn2,
|
|
.mask = (1LL << 55) - 1,
|
|
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
|
|
};
|
|
|
|
/*
|
|
* sn udelay uses the RTC instead of the ITC because the ITC is not
|
|
* synchronized across all CPUs, and the thread may migrate to another CPU
|
|
* if preemption is enabled.
|
|
*/
|
|
static void
|
|
ia64_sn_udelay (unsigned long usecs)
|
|
{
|
|
unsigned long start = rtc_time();
|
|
unsigned long end = start +
|
|
usecs * sn_rtc_cycles_per_second / 1000000;
|
|
|
|
while (time_before((unsigned long)rtc_time(), end))
|
|
cpu_relax();
|
|
}
|
|
|
|
void __init sn_timer_init(void)
|
|
{
|
|
clocksource_sn2.archdata.fsys_mmio = RTC_COUNTER_ADDR;
|
|
clocksource_register_hz(&clocksource_sn2, sn_rtc_cycles_per_second);
|
|
|
|
ia64_udelay = &ia64_sn_udelay;
|
|
}
|