mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 15:43:59 +08:00
65cd4f6c99
Register with the generic sched_clock framework now that it
supports 64 bits. This fixes two problems with the current
sched_clock support for machines using the architected timers.
First off, we don't subtract the start value from subsequent
sched_clock calls so we can potentially start off with
sched_clock returning gigantic numbers. Second, there is no
support for suspend/resume handling so problems such as discussed
in 6a4dae5 (ARM: 7565/1: sched: stop sched_clock() during
suspend, 2012-10-23) can happen without this patch. Finally, it
allows us to move the sched_clock setup into drivers clocksource
out of the arch ports.
Cc: Christopher Covington <cov@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
/*
|
|
* linux/arch/arm/kernel/arch_timer.c
|
|
*
|
|
* Copyright (C) 2011 ARM Ltd.
|
|
* All Rights Reserved
|
|
*
|
|
* 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/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/errno.h>
|
|
|
|
#include <asm/delay.h>
|
|
|
|
#include <clocksource/arm_arch_timer.h>
|
|
|
|
static unsigned long arch_timer_read_counter_long(void)
|
|
{
|
|
return arch_timer_read_counter();
|
|
}
|
|
|
|
static struct delay_timer arch_delay_timer;
|
|
|
|
static void __init arch_timer_delay_timer_register(void)
|
|
{
|
|
/* Use the architected timer for the delay loop. */
|
|
arch_delay_timer.read_current_timer = arch_timer_read_counter_long;
|
|
arch_delay_timer.freq = arch_timer_get_rate();
|
|
register_current_timer_delay(&arch_delay_timer);
|
|
}
|
|
|
|
int __init arch_timer_arch_init(void)
|
|
{
|
|
u32 arch_timer_rate = arch_timer_get_rate();
|
|
|
|
if (arch_timer_rate == 0)
|
|
return -ENXIO;
|
|
|
|
arch_timer_delay_timer_register();
|
|
|
|
return 0;
|
|
}
|