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: 0ecfebd2b52404ae0c54a878c872bb93363ada36 authored by Linus Torvalds on 07 July 2019, 22:41:56 UTC
Linux 5.2
Linux 5.2
Tip revision: 0ecfebd
time.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/arch/arm/common/time-acorn.c
*
* Copyright (c) 1996-2000 Russell King.
*
* Changelog:
* 24-Sep-1996 RMK Created
* 10-Oct-1996 RMK Brought up to date with arch-sa110eval
* 04-Dec-1997 RMK Updated for new arch/arm/time.c
* 13=Jun-2004 DS Moved to arch/arm/common b/c shared w/CLPS7500
*/
#include <linux/timex.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/hardware/ioc.h>
#include <asm/mach/time.h>
#define RPC_CLOCK_FREQ 2000000
#define RPC_LATCH DIV_ROUND_CLOSEST(RPC_CLOCK_FREQ, HZ)
static u32 ioc_timer_gettimeoffset(void)
{
unsigned int count1, count2, status;
long offset;
ioc_writeb (0, IOC_T0LATCH);
barrier ();
count1 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8);
barrier ();
status = ioc_readb(IOC_IRQREQA);
barrier ();
ioc_writeb (0, IOC_T0LATCH);
barrier ();
count2 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8);
offset = count2;
if (count2 < count1) {
/*
* We have not had an interrupt between reading count1
* and count2.
*/
if (status & (1 << 5))
offset -= RPC_LATCH;
} else if (count2 > count1) {
/*
* We have just had another interrupt between reading
* count1 and count2.
*/
offset -= RPC_LATCH;
}
offset = (RPC_LATCH - offset) * (tick_nsec / 1000);
return DIV_ROUND_CLOSEST(offset, RPC_LATCH) * 1000;
}
void __init ioctime_init(void)
{
ioc_writeb(RPC_LATCH & 255, IOC_T0LTCHL);
ioc_writeb(RPC_LATCH >> 8, IOC_T0LTCHH);
ioc_writeb(0, IOC_T0GO);
}
static irqreturn_t
ioc_timer_interrupt(int irq, void *dev_id)
{
timer_tick();
return IRQ_HANDLED;
}
static struct irqaction ioc_timer_irq = {
.name = "timer",
.handler = ioc_timer_interrupt
};
/*
* Set up timer interrupt.
*/
void __init ioc_timer_init(void)
{
arch_gettimeoffset = ioc_timer_gettimeoffset;
ioctime_init();
setup_irq(IRQ_TIMER0, &ioc_timer_irq);
}