198 lines
4.9 KiB
C
198 lines
4.9 KiB
C
/*
|
|
* linux/arch/m32r/kernel/time.c
|
|
*
|
|
* Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
|
|
* Hitoshi Yamamoto
|
|
* Taken from i386 version.
|
|
* Copyright (C) 1991, 1992, 1995 Linus Torvalds
|
|
* Copyright (C) 1996, 1997, 1998 Ralf Baechle
|
|
*
|
|
* This file contains the time handling details for PC-style clocks as
|
|
* found in some MIPS systems.
|
|
*
|
|
* Some code taken from sh version.
|
|
* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
|
|
* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
|
|
*/
|
|
|
|
#undef DEBUG_TIMER
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/param.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/profile.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/m32r.h>
|
|
|
|
#include <asm/hw_irq.h>
|
|
|
|
#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
|
|
/* this needs a better home */
|
|
DEFINE_SPINLOCK(rtc_lock);
|
|
|
|
#ifdef CONFIG_RTC_DRV_CMOS_MODULE
|
|
EXPORT_SYMBOL(rtc_lock);
|
|
#endif
|
|
#endif /* pc-style 'CMOS' RTC support */
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern void smp_local_timer_interrupt(void);
|
|
#endif
|
|
|
|
#define TICK_SIZE (tick_nsec / 1000)
|
|
|
|
/*
|
|
* Change this if you have some constant time drift
|
|
*/
|
|
|
|
/* This is for machines which generate the exact clock. */
|
|
#define USECS_PER_JIFFY (1000000/HZ)
|
|
|
|
static unsigned long latch;
|
|
|
|
static u32 m32r_gettimeoffset(void)
|
|
{
|
|
unsigned long elapsed_time = 0; /* [us] */
|
|
|
|
#if defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_XNUX2) \
|
|
|| defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_M32700) \
|
|
|| defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
|
|
#ifndef CONFIG_SMP
|
|
|
|
unsigned long count;
|
|
|
|
/* timer count may underflow right here */
|
|
count = inl(M32R_MFT2CUT_PORTL);
|
|
|
|
if (inl(M32R_ICU_CR18_PORTL) & 0x00000100) /* underflow check */
|
|
count = 0;
|
|
|
|
count = (latch - count) * TICK_SIZE;
|
|
elapsed_time = DIV_ROUND_CLOSEST(count, latch);
|
|
/* NOTE: LATCH is equal to the "interval" value (= reload count). */
|
|
|
|
#else /* CONFIG_SMP */
|
|
unsigned long count;
|
|
static unsigned long p_jiffies = -1;
|
|
static unsigned long p_count = 0;
|
|
|
|
/* timer count may underflow right here */
|
|
count = inl(M32R_MFT2CUT_PORTL);
|
|
|
|
if (jiffies == p_jiffies && count > p_count)
|
|
count = 0;
|
|
|
|
p_jiffies = jiffies;
|
|
p_count = count;
|
|
|
|
count = (latch - count) * TICK_SIZE;
|
|
elapsed_time = DIV_ROUND_CLOSEST(count, latch);
|
|
/* NOTE: LATCH is equal to the "interval" value (= reload count). */
|
|
#endif /* CONFIG_SMP */
|
|
#elif defined(CONFIG_CHIP_M32310)
|
|
#warning do_gettimeoffse not implemented
|
|
#else
|
|
#error no chip configuration
|
|
#endif
|
|
|
|
return elapsed_time * 1000;
|
|
}
|
|
|
|
/*
|
|
* timer_interrupt() needs to keep up the real-time clock,
|
|
* as well as call the "xtime_update()" routine every clocktick
|
|
*/
|
|
static irqreturn_t timer_interrupt(int irq, void *dev_id)
|
|
{
|
|
#ifndef CONFIG_SMP
|
|
profile_tick(CPU_PROFILING);
|
|
#endif
|
|
xtime_update(1);
|
|
|
|
#ifndef CONFIG_SMP
|
|
update_process_times(user_mode(get_irq_regs()));
|
|
#endif
|
|
/* As we return to user mode fire off the other CPU schedulers..
|
|
this is basically because we don't yet share IRQ's around.
|
|
This message is rigged to be safe on the 386 - basically it's
|
|
a hack, so don't look closely for now.. */
|
|
|
|
#ifdef CONFIG_SMP
|
|
smp_local_timer_interrupt();
|
|
smp_send_timer();
|
|
#endif
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct irqaction irq0 = {
|
|
.handler = timer_interrupt,
|
|
.name = "MFT2",
|
|
};
|
|
|
|
void read_persistent_clock(struct timespec *ts)
|
|
{
|
|
unsigned int epoch, year, mon, day, hour, min, sec;
|
|
|
|
sec = min = hour = day = mon = year = 0;
|
|
epoch = 0;
|
|
|
|
year = 23;
|
|
mon = 4;
|
|
day = 17;
|
|
|
|
/* Attempt to guess the epoch. This is the same heuristic as in rtc.c
|
|
so no stupid things will happen to timekeeping. Who knows, maybe
|
|
Ultrix also uses 1952 as epoch ... */
|
|
if (year > 10 && year < 44)
|
|
epoch = 1980;
|
|
else if (year < 96)
|
|
epoch = 1952;
|
|
year += epoch;
|
|
|
|
ts->tv_sec = mktime(year, mon, day, hour, min, sec);
|
|
ts->tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
|
|
}
|
|
|
|
|
|
void __init time_init(void)
|
|
{
|
|
arch_gettimeoffset = m32r_gettimeoffset;
|
|
|
|
#if defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_XNUX2) \
|
|
|| defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_M32700) \
|
|
|| defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
|
|
|
|
/* M32102 MFT setup */
|
|
setup_irq(M32R_IRQ_MFT2, &irq0);
|
|
{
|
|
unsigned long bus_clock;
|
|
unsigned short divide;
|
|
|
|
bus_clock = boot_cpu_data.bus_clock;
|
|
divide = boot_cpu_data.timer_divide;
|
|
latch = DIV_ROUND_CLOSEST(bus_clock/divide, HZ);
|
|
|
|
printk("Timer start : latch = %ld\n", latch);
|
|
|
|
outl((M32R_MFTMOD_CC_MASK | M32R_MFTMOD_TCCR \
|
|
|M32R_MFTMOD_CSSEL011), M32R_MFT2MOD_PORTL);
|
|
outl(latch, M32R_MFT2RLD_PORTL);
|
|
outl(latch, M32R_MFT2CUT_PORTL);
|
|
outl(0, M32R_MFT2CMPRLD_PORTL);
|
|
outl((M32R_MFTCR_MFT2MSK|M32R_MFTCR_MFT2EN), M32R_MFTCR_PORTL);
|
|
}
|
|
|
|
#elif defined(CONFIG_CHIP_M32310)
|
|
#warning time_init not implemented
|
|
#else
|
|
#error no chip configuration
|
|
#endif
|
|
}
|