mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 13:22:23 +00:00
739b27116a
This patch converts the frv architecture to use the generic read_persistent_clock and update_persistent_clock interfaces, reducing the amount of arch specific code we have to maintain, and allowing for further cleanups in the future. I have not built or tested this patch, so help from arch maintainers would be appreciated. Signed-off-by: John Stultz <johnstul@us.ibm.com> Cc: David Howells <dhowells@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <1267675049-12337-4-git-send-email-johnstul@us.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/* time.c: FRV arch-specific time handling
|
|
*
|
|
* Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
* - Derived from arch/m68k/kernel/time.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/param.h>
|
|
#include <linux/string.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/profile.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/mm.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/timer-regs.h>
|
|
#include <asm/mb-regs.h>
|
|
#include <asm/mb86943a.h>
|
|
|
|
#include <linux/timex.h>
|
|
|
|
#define TICK_SIZE (tick_nsec / 1000)
|
|
|
|
unsigned long __nongprelbss __clkin_clock_speed_HZ;
|
|
unsigned long __nongprelbss __ext_bus_clock_speed_HZ;
|
|
unsigned long __nongprelbss __res_bus_clock_speed_HZ;
|
|
unsigned long __nongprelbss __sdram_clock_speed_HZ;
|
|
unsigned long __nongprelbss __core_bus_clock_speed_HZ;
|
|
unsigned long __nongprelbss __core_clock_speed_HZ;
|
|
unsigned long __nongprelbss __dsu_clock_speed_HZ;
|
|
unsigned long __nongprelbss __serial_clock_speed_HZ;
|
|
unsigned long __delay_loops_MHz;
|
|
|
|
static irqreturn_t timer_interrupt(int irq, void *dummy);
|
|
|
|
static struct irqaction timer_irq = {
|
|
.handler = timer_interrupt,
|
|
.flags = IRQF_DISABLED,
|
|
.name = "timer",
|
|
};
|
|
|
|
/*
|
|
* timer_interrupt() needs to keep up the real-time clock,
|
|
* as well as call the "do_timer()" routine every clocktick
|
|
*/
|
|
static irqreturn_t timer_interrupt(int irq, void *dummy)
|
|
{
|
|
profile_tick(CPU_PROFILING);
|
|
/*
|
|
* Here we are in the timer irq handler. We just have irqs locally
|
|
* disabled but we don't know if the timer_bh is running on the other
|
|
* CPU. We need to avoid to SMP race with it. NOTE: we don't need
|
|
* the irq version of write_lock because as just said we have irq
|
|
* locally disabled. -arca
|
|
*/
|
|
write_seqlock(&xtime_lock);
|
|
|
|
do_timer(1);
|
|
|
|
#ifdef CONFIG_HEARTBEAT
|
|
static unsigned short n;
|
|
n++;
|
|
__set_LEDS(n);
|
|
#endif /* CONFIG_HEARTBEAT */
|
|
|
|
write_sequnlock(&xtime_lock);
|
|
|
|
update_process_times(user_mode(get_irq_regs()));
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
void time_divisor_init(void)
|
|
{
|
|
unsigned short base, pre, prediv;
|
|
|
|
/* set the scheduling timer going */
|
|
pre = 1;
|
|
prediv = 4;
|
|
base = __res_bus_clock_speed_HZ / pre / HZ / (1 << prediv);
|
|
|
|
__set_TPRV(pre);
|
|
__set_TxCKSL_DATA(0, prediv);
|
|
__set_TCTR(TCTR_SC_CTR0 | TCTR_RL_RW_LH8 | TCTR_MODE_2);
|
|
__set_TCSR_DATA(0, base & 0xff);
|
|
__set_TCSR_DATA(0, base >> 8);
|
|
}
|
|
|
|
|
|
void read_persistent_clock(struct timespec *ts)
|
|
{
|
|
unsigned int year, mon, day, hour, min, sec;
|
|
|
|
extern void arch_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec);
|
|
|
|
/* FIX by dqg : Set to zero for platforms that don't have tod */
|
|
/* without this time is undefined and can overflow time_t, causing */
|
|
/* very strange errors */
|
|
year = 1980;
|
|
mon = day = 1;
|
|
hour = min = sec = 0;
|
|
arch_gettod (&year, &mon, &day, &hour, &min, &sec);
|
|
|
|
if ((year += 1900) < 1970)
|
|
year += 100;
|
|
ts->tv_sec = mktime(year, mon, day, hour, min, sec);
|
|
ts->tv_nsec = 0;
|
|
}
|
|
|
|
void time_init(void)
|
|
{
|
|
/* install scheduling interrupt handler */
|
|
setup_irq(IRQ_CPU_TIMER0, &timer_irq);
|
|
|
|
time_divisor_init();
|
|
}
|
|
|
|
/*
|
|
* Scheduler clock - returns current time in nanosec units.
|
|
*/
|
|
unsigned long long sched_clock(void)
|
|
{
|
|
return jiffies_64 * (1000000000 / HZ);
|
|
}
|