410 lines
9.0 KiB
C
410 lines
9.0 KiB
C
/* $NetBSD: iomd_clock.c,v 1.7 1996/08/21 19:07:19 mark Exp $ */
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/*
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* Copyright (c) 1994-1996 Mark Brinicombe.
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* Copyright (c) 1994 Brini.
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* All rights reserved.
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*
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* This code is derived from software written for Brini by Mark Brinicombe
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Brini.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* RiscBSD kernel project
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*
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* clock.c
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*
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* Timer related machine specific code
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*
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* Created : 29/09/94
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*/
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/* Include header files */
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/time.h>
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#include <machine/katelib.h>
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#include <machine/iomd.h>
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#include <machine/irqhandler.h>
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#include <machine/cpu.h>
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#include <machine/rtc.h>
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#include "rtc.h"
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#if NRTC == 0
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#error "Need at least one RTC device for timeofday management"
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#endif
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#define TIMER0_COUNT 20000 /* 100Hz */
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#define TIMER_FREQUENCY 20000000 /* 2MHz clock */
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#define TICKS_PER_MICROSECOND (TIMER_FREQUENCY / 10000000)
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static irqhandler_t clockirq;
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static irqhandler_t statclockirq;
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/*
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* int clockhandler(struct clockframe *frame)
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*
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* Function called by timer 0 interrupts. This just calls
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* hardclock(). Eventually the irqhandler can call hardclock() directly
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* but for now we use this function so that we can debug IRQ's
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*/
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int
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clockhandler(frame)
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struct clockframe *frame;
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{
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#ifdef RC7500
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extern void setleds();
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static int leds = 0;
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setleds(1 << leds);
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leds++;
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if (leds >> 3)
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leds = 0;
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#endif
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hardclock(frame);
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return(0); /* Pass the interrupt on down the chain */
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}
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/*
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* int statclockhandler(struct clockframe *frame)
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*
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* Function called by timer 1 interrupts. This just calls
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* statclock(). Eventually the irqhandler can call statclock() directly
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* but for now we use this function so that we can debug IRQ's
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*/
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int
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statclockhandler(frame)
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struct clockframe *frame;
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{
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statclock(frame);
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return(0); /* Pass the interrupt on down the chain */
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}
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/*
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* void setstatclockrate(int hz)
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*
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* Set the stat clock rate. The stat clock uses timer1
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*/
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void
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setstatclockrate(hz)
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int hz;
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{
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int count;
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count = TIMER_FREQUENCY / hz;
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printf("Setting statclock to %dHz (%d ticks)\n", hz, count);
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WriteByte(IOMD_T1LOW, (count >> 0) & 0xff);
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WriteByte(IOMD_T1HIGH, (count >> 8) & 0xff);
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/* reload the counter */
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WriteByte(IOMD_T1GO, 0);
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}
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/*
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* void cpu_initclocks(void)
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*
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* Initialise the clocks.
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* This sets up the two timers in the IOMD and installs the IRQ handlers
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*
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* NOTE: Currently only timer 0 is setup and the IRQ handler is not installed
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*/
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void
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cpu_initclocks()
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{
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/*
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* Load timer 0 with count down value
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* This timer generates 100Hz interrupts for the system clock
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*/
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printf("clock: hz=%d stathz = %d profhz = %d\n", hz, stathz, profhz);
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WriteByte(IOMD_T0LOW, (TIMER0_COUNT >> 0) & 0xff);
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WriteByte(IOMD_T0HIGH, (TIMER0_COUNT >> 8) & 0xff);
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/* reload the counter */
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WriteByte(IOMD_T0GO, 0);
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clockirq.ih_func = clockhandler;
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clockirq.ih_arg = 0;
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clockirq.ih_level = IPL_CLOCK;
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clockirq.ih_name = "TMR0 hard clk";
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if (irq_claim(IRQ_TIMER0, &clockirq) == -1)
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panic("Cannot installer timer 0 IRQ handler\n");
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if (stathz) {
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setstatclockrate(stathz);
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statclockirq.ih_func = statclockhandler;
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statclockirq.ih_arg = 0;
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statclockirq.ih_level = IPL_CLOCK;
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if (irq_claim(IRQ_TIMER1, &clockirq) == -1)
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panic("Cannot installer timer 1 IRQ handler\n");
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}
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}
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/*
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* void microtime(struct timeval *tvp)
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*
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* Fill in the specified timeval struct with the current time
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* accurate to the microsecond.
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*/
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void
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microtime(tvp)
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struct timeval *tvp;
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{
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int s;
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int tm;
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int deltatm;
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static int oldtm;
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static struct timeval oldtv;
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s = splhigh();
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/*
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* Latch the current value of the timer and then read it. This garentees
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* an atmoic reading of the time.
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*/
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WriteByte(IOMD_T0LATCH, 0);
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tm = ReadByte(IOMD_T0LOW) + (ReadByte(IOMD_T0HIGH) << 8);
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deltatm = tm - oldtm;
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if (deltatm < 0) deltatm += TIMER0_COUNT;
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if (deltatm < 0) {
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printf("opps deltatm < 0 tm=%d oldtm=%d deltatm=%d\n",
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tm, oldtm, deltatm);
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}
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oldtm = tm;
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/* Fill in the timeval struct */
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*tvp = time;
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tvp->tv_usec += (deltatm / TICKS_PER_MICROSECOND);
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/* Make sure the micro seconds don't overflow. */
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while (tvp->tv_usec > 1000000) {
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tvp->tv_usec -= 1000000;
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++tvp->tv_sec;
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}
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/* Make sure the time has advanced. */
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if (tvp->tv_sec == oldtv.tv_sec &&
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tvp->tv_usec <= oldtv.tv_usec) {
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tvp->tv_usec = oldtv.tv_usec + 1;
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if (tvp->tv_usec > 1000000) {
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tvp->tv_usec -= 1000000;
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++tvp->tv_sec;
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}
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}
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oldtv = *tvp;
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(void)splx(s);
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}
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void
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need_proftick(p)
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struct proc *p;
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{
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}
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static inline int
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yeartoday(year)
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int year;
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{
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return((year % 4) ? 365 : 366);
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}
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static int month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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static int timeset = 0;
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#define SECPERDAY (24*60*60)
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#define SECPERNYEAR (365*SECPERDAY)
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#define SECPER4YEARS (4*SECPERNYEAR+SECPERDAY)
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#define EPOCHYEAR 1970
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/*
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* Write back the time of day to the rtc
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*/
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void
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resettodr()
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{
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int s;
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time_t year, mon, day, hour, min, sec;
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rtc_t rtc;
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if (!timeset)
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return;
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sec = time.tv_sec;
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year = (sec / SECPER4YEARS) * 4;
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sec %= SECPER4YEARS;
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/* year now hold the number of years rounded down 4 */
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while (sec > (yeartoday(EPOCHYEAR+year) * SECPERDAY)) {
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sec -= yeartoday(EPOCHYEAR+year)*SECPERDAY;
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year++;
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}
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/* year is now a correct offset from the EPOCHYEAR */
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year+=EPOCHYEAR;
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mon=0;
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if (yeartoday(year) == 366)
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month[1]=29;
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else
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month[1]=28;
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while ((sec/SECPERDAY) > month[mon]) {
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sec -= month[mon]*SECPERDAY;
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mon++;
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}
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day = sec / SECPERDAY;
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sec %= SECPERDAY;
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hour = sec / 3600;
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sec %= 3600;
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min = sec / 60;
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sec %= 60;
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rtc.rtc_cen = year / 100;
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rtc.rtc_year = year % 100;
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rtc.rtc_mon = mon+1;
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rtc.rtc_day = day+1;
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rtc.rtc_hour = hour;
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rtc.rtc_min = min;
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rtc.rtc_sec = sec;
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rtc.rtc_centi =
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rtc.rtc_micro = 0;
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/*
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printf("resettod: %d/%d/%d%d %d:%d:%d\n", rtc.rtc_day,
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rtc.rtc_mon, rtc.rtc_cen, rtc.rtc_year, rtc.rtc_hour,
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rtc.rtc_min, rtc.rtc_sec);
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*/
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s = splclock();
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rtc_write(&rtc);
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(void)splx(s);
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}
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/*
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* Initialise the time of day register, based on the time base which is, e.g.
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* from a filesystem.
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*/
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void
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inittodr(base)
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time_t base;
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{
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time_t n;
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int i, days = 0;
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int s;
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int year;
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rtc_t rtc;
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/*
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* We ignore the suggested time for now and go for the RTC
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* clock time stored in the CMOS RAM.
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*/
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s = splclock();
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if (rtc_read(&rtc) == 0) {
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(void)splx(s);
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return;
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}
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(void)splx(s);
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n = rtc.rtc_sec + 60 * rtc.rtc_min + 3600 * rtc.rtc_hour;
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n += (rtc.rtc_day - 1) * 3600 * 24;
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year = (rtc.rtc_year + rtc.rtc_cen * 100) - 1900;
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if (yeartoday(year) == 366)
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month[1] = 29;
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for (i = rtc.rtc_mon - 2; i >= 0; i--)
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days += month[i];
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month[1] = 28;
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for (i = 70; i < year; i++)
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days += yeartoday(i);
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n += days * 3600 * 24;
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n += tz.tz_minuteswest * 60;
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if (tz.tz_dsttime)
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n -= 3600;
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time.tv_sec = n;
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time.tv_usec = 0;
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/* timeset is used to ensure the time is valid before a resettodr() */
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timeset = 1;
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/* If the base was 0 then keep quiet */
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if (base) {
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printf("inittodr: %02d:%02d:%02d.%02d%02d %02d/%02d/%02d%02d\n",
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rtc.rtc_hour, rtc.rtc_min, rtc.rtc_sec, rtc.rtc_centi,
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rtc.rtc_micro, rtc.rtc_day, rtc.rtc_mon, rtc.rtc_cen,
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rtc.rtc_year);
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if (n > base + 60) {
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days = (n - base) / SECPERDAY;
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printf("Clock has gained %d day%c %ld hours %ld minutes %ld secs\n",
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days, ((days == 1) ? 0 : 's'), ((n - base) / 3600) % 24,
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((n - base) / 60) % 60, (n - base) % 60);
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}
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}
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}
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/* End of clock.c */
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