diff options
Diffstat (limited to 'arch/v850/kernel/time.c')
| -rw-r--r-- | arch/v850/kernel/time.c | 191 |
1 files changed, 0 insertions, 191 deletions
diff --git a/arch/v850/kernel/time.c b/arch/v850/kernel/time.c deleted file mode 100644 index c1e85c2aef6..00000000000 --- a/arch/v850/kernel/time.c +++ /dev/null @@ -1,191 +0,0 @@ -/* - * linux/arch/v850/kernel/time.c -- Arch-dependent timer functions - * - * Copyright (C) 1991, 1992, 1995, 2001, 2002 Linus Torvalds - * - * This file contains the v850-specific time handling details. - * Most of the stuff is located in the machine specific files. - * - * 1997-09-10 Updated NTP code according to technical memorandum Jan '96 - * "A Kernel Model for Precision Timekeeping" by Dave Mills - */ - -#include <linux/config.h> /* CONFIG_HEARTBEAT */ -#include <linux/errno.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/param.h> -#include <linux/string.h> -#include <linux/mm.h> -#include <linux/interrupt.h> -#include <linux/time.h> -#include <linux/timex.h> -#include <linux/profile.h> - -#include <asm/io.h> - -#include "mach.h" - -#define TICK_SIZE (tick_nsec / 1000) - -/* - * Scheduler clock - returns current time in nanosec units. - */ -unsigned long long sched_clock(void) -{ - return (unsigned long long)jiffies * (1000000000 / HZ); -} - -/* - * 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, struct pt_regs *regs) -{ -#if 0 - /* last time the cmos clock got updated */ - static long last_rtc_update=0; -#endif - - /* may need to kick the hardware timer */ - if (mach_tick) - mach_tick (); - - do_timer (regs); -#ifndef CONFIG_SMP - update_process_times(user_mode(regs)); -#endif - profile_tick(CPU_PROFILING, regs); -#if 0 - /* - * If we have an externally synchronized Linux clock, then update - * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be - * called as close as possible to 500 ms before the new second starts. - */ - if (ntp_synced() && - xtime.tv_sec > last_rtc_update + 660 && - (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 && - (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) { - if (set_rtc_mmss (xtime.tv_sec) == 0) - last_rtc_update = xtime.tv_sec; - else - last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */ - } -#ifdef CONFIG_HEARTBEAT - /* use power LED as a heartbeat instead -- much more useful - for debugging -- based on the version for PReP by Cort */ - /* acts like an actual heart beat -- ie thump-thump-pause... */ - if (mach_heartbeat) { - static unsigned cnt = 0, period = 0, dist = 0; - - if (cnt == 0 || cnt == dist) - mach_heartbeat ( 1 ); - else if (cnt == 7 || cnt == dist+7) - mach_heartbeat ( 0 ); - - if (++cnt > period) { - cnt = 0; - /* The hyperbolic function below modifies the heartbeat period - * length in dependency of the current (5min) load. It goes - * through the points f(0)=126, f(1)=86, f(5)=51, - * f(inf)->30. */ - period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30; - dist = period / 4; - } - } -#endif /* CONFIG_HEARTBEAT */ -#endif /* 0 */ - - return IRQ_HANDLED; -} - -/* - * This version of gettimeofday has near microsecond resolution. - */ -void do_gettimeofday (struct timeval *tv) -{ -#if 0 /* DAVIDM later if possible */ - extern volatile unsigned long lost_ticks; - unsigned long lost; -#endif - unsigned long flags; - unsigned long usec, sec; - unsigned long seq; - - do { - seq = read_seqbegin_irqsave(&xtime_lock, flags); - -#if 0 - usec = mach_gettimeoffset ? mach_gettimeoffset () : 0; -#else - usec = 0; -#endif -#if 0 /* DAVIDM later if possible */ - lost = lost_ticks; - if (lost) - usec += lost * (1000000/HZ); -#endif - sec = xtime.tv_sec; - usec += xtime.tv_nsec / 1000; - } while (read_seqretry_irqrestore(&xtime_lock, seq, flags)); - - while (usec >= 1000000) { - usec -= 1000000; - sec++; - } - - tv->tv_sec = sec; - tv->tv_usec = usec; -} - -EXPORT_SYMBOL(do_gettimeofday); - -int do_settimeofday(struct timespec *tv) -{ - if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC) - return -EINVAL; - - write_seqlock_irq (&xtime_lock); - - /* This is revolting. We need to set the xtime.tv_nsec - * correctly. However, the value in this location is - * is value at the last tick. - * Discover what correction gettimeofday - * would have done, and then undo it! - */ -#if 0 - tv->tv_nsec -= mach_gettimeoffset() * 1000; -#endif - - while (tv->tv_nsec < 0) { - tv->tv_nsec += NSEC_PER_SEC; - tv->tv_sec--; - } - - xtime.tv_sec = tv->tv_sec; - xtime.tv_nsec = tv->tv_nsec; - - ntp_clear(); - - write_sequnlock_irq (&xtime_lock); - clock_was_set(); - return 0; -} - -EXPORT_SYMBOL(do_settimeofday); - -static int timer_dev_id; -static struct irqaction timer_irqaction = { - timer_interrupt, - SA_INTERRUPT, - CPU_MASK_NONE, - "timer", - &timer_dev_id, - NULL -}; - -void time_init (void) -{ - mach_gettimeofday (&xtime); - mach_sched_init (&timer_irqaction); -} |