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: 44597f65f6af3c692560a639f61d25398d13d1b6 authored by Linus Torvalds on 16 November 2006, 04:03:40 UTC
Linux 2.6.19-rc6
Linux 2.6.19-rc6
Tip revision: 44597f6
time.c
/*
* linux/arch/m68k/hp300/time.c
*
* Copyright (C) 1998 Philip Blundell <philb@gnu.org>
*
* This file contains the HP300-specific time handling code.
*/
#include <asm/ptrace.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/interrupt.h>
#include <asm/machdep.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/traps.h>
#include <asm/blinken.h>
/* Clock hardware definitions */
#define CLOCKBASE 0xf05f8000
#define CLKCR1 0x1
#define CLKCR2 0x3
#define CLKCR3 CLKCR1
#define CLKSR CLKCR2
#define CLKMSB1 0x5
#define CLKMSB2 0x9
#define CLKMSB3 0xD
/* This is for machines which generate the exact clock. */
#define USECS_PER_JIFFY (1000000/HZ)
#define INTVAL ((10000 / 4) - 1)
static irqreturn_t hp300_tick(int irq, void *dev_id)
{
unsigned long tmp;
irq_handler_t vector = dev_id;
in_8(CLOCKBASE + CLKSR);
asm volatile ("movpw %1@(5),%0" : "=d" (tmp) : "a" (CLOCKBASE));
/* Turn off the network and SCSI leds */
blinken_leds(0, 0xe0);
return vector(irq, NULL);
}
unsigned long hp300_gettimeoffset(void)
{
/* Read current timer 1 value */
unsigned char lsb, msb1, msb2;
unsigned short ticks;
msb1 = in_8(CLOCKBASE + 5);
lsb = in_8(CLOCKBASE + 7);
msb2 = in_8(CLOCKBASE + 5);
if (msb1 != msb2)
/* A carry happened while we were reading. Read it again */
lsb = in_8(CLOCKBASE + 7);
ticks = INTVAL - ((msb2 << 8) | lsb);
return (USECS_PER_JIFFY * ticks) / INTVAL;
}
void __init hp300_sched_init(irq_handler_t vector)
{
out_8(CLOCKBASE + CLKCR2, 0x1); /* select CR1 */
out_8(CLOCKBASE + CLKCR1, 0x1); /* reset */
asm volatile(" movpw %0,%1@(5)" : : "d" (INTVAL), "a" (CLOCKBASE));
request_irq(IRQ_AUTO_6, hp300_tick, IRQ_FLG_STD, "timer tick", vector);
out_8(CLOCKBASE + CLKCR2, 0x1); /* select CR1 */
out_8(CLOCKBASE + CLKCR1, 0x40); /* enable irq */
}