2b9a69861c
The PIT code has been changed in order to suppport GENERIC_CLOCKEVENTS. The priority of the PIT clocksource has been decreased in favor of the DMA timer. pit_cycles_per_jiffy become a constant (PIT_CYCLES_PER_JIFFY) because it is known at compile time and does not change afterwards. Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de> Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de> Signed-off-by: Greg Ungerer <gerg@uclinux.org>
88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
/*
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* linux/arch/m68knommu/kernel/time.c
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*
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* Copyright (C) 1991, 1992, 1995 Linus Torvalds
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*
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* This file contains the m68k-specific time handling details.
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* Most of the stuff is located in the machine specific files.
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*
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* 1997-09-10 Updated NTP code according to technical memorandum Jan '96
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* "A Kernel Model for Precision Timekeeping" by Dave Mills
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/profile.h>
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#include <linux/time.h>
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#include <linux/timex.h>
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#include <asm/machdep.h>
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#include <asm/irq_regs.h>
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#define TICK_SIZE (tick_nsec / 1000)
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static inline int set_rtc_mmss(unsigned long nowtime)
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{
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if (mach_set_clock_mmss)
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return mach_set_clock_mmss (nowtime);
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return -1;
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}
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#ifndef CONFIG_GENERIC_CLOCKEVENTS
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/*
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* timer_interrupt() needs to keep up the real-time clock,
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* as well as call the "do_timer()" routine every clocktick
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*/
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irqreturn_t arch_timer_interrupt(int irq, void *dummy)
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{
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if (current->pid)
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profile_tick(CPU_PROFILING);
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write_seqlock(&xtime_lock);
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do_timer(1);
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write_sequnlock(&xtime_lock);
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#ifndef CONFIG_SMP
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update_process_times(user_mode(get_irq_regs()));
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#endif
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return(IRQ_HANDLED);
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}
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#endif
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static unsigned long read_rtc_mmss(void)
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{
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unsigned int year, mon, day, hour, min, sec;
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if (mach_gettod)
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mach_gettod(&year, &mon, &day, &hour, &min, &sec);
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else
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year = mon = day = hour = min = sec = 0;
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if ((year += 1900) < 1970)
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year += 100;
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return mktime(year, mon, day, hour, min, sec);;
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}
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unsigned long read_persistent_clock(void)
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{
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return read_rtc_mmss();
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}
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int update_persistent_clock(struct timespec now)
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{
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return set_rtc_mmss(now.tv_sec);
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}
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void time_init(void)
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{
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hw_timer_init();
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}
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