565 lines
14 KiB
C
565 lines
14 KiB
C
/* $NetBSD: clock.c,v 1.21 2000/01/06 12:03:31 leo Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1982, 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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 the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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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* from: Utah $Hdr: clock.c 1.18 91/01/21$
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*
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* @(#)clock.c 7.6 (Berkeley) 5/7/91
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/uio.h>
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#include <sys/conf.h>
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#include <dev/clock_subr.h>
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#include <machine/psl.h>
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#include <machine/cpu.h>
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#include <machine/iomap.h>
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#include <machine/mfp.h>
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#include <atari/dev/clockreg.h>
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#include <atari/atari/device.h>
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#if defined(GPROF) && defined(PROFTIMER)
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#include <machine/profile.h>
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#endif
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/*
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* The MFP clock runs at 2457600Hz. We use a {system,stat,prof}clock divider
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* of 200. Therefore the timer runs at an effective rate of:
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* 2457600/200 = 12288Hz.
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*/
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#define CLOCK_HZ 12288
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/*
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* Machine-dependent clock routines.
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*
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* Inittodr initializes the time of day hardware which provides
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* date functions.
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*
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* Resettodr restores the time of day hardware after a time change.
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*/
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struct clock_softc {
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struct device sc_dev;
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int sc_flags;
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};
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/*
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* 'sc_flags' state info. Only used by the rtc-device functions.
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*/
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#define RTC_OPEN 1
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/* {b,c}devsw[] function prototypes for rtc functions */
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dev_type_open(rtcopen);
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dev_type_close(rtcclose);
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dev_type_read(rtcread);
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dev_type_write(rtcwrite);
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static void clockattach __P((struct device *, struct device *, void *));
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static int clockmatch __P((struct device *, struct cfdata *, void *));
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struct cfattach clock_ca = {
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sizeof(struct clock_softc), clockmatch, clockattach
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};
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extern struct cfdriver clock_cd;
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void statintr __P((struct clockframe));
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static u_long gettod __P((void));
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static int twodigits __P((char *, int));
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static int divisor; /* Systemclock divisor */
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/*
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* Statistics and profile clock intervals and variances. Variance must
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* be a power of 2. Since this gives us an even number, not an odd number,
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* we discard one case and compensate. That is, a variance of 64 would
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* give us offsets in [0..63]. Instead, we take offsets in [1..63].
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* This is symetric around the point 32, or statvar/2, and thus averages
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* to that value (assuming uniform random numbers).
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*/
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#ifdef STATCLOCK
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static int statvar = 32; /* {stat,prof}clock variance */
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static int statmin; /* statclock divisor - variance/2 */
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static int profmin; /* profclock divisor - variance/2 */
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static int clk2min; /* current, from above choises */
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#endif
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int
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clockmatch(pdp, cfp, auxp)
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struct device *pdp;
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struct cfdata *cfp;
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void *auxp;
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{
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if (!atari_realconfig) {
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/*
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* Initialize Timer-B in the ST-MFP. This timer is used by
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* the 'delay' function below. This timer is setup to be
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* continueously counting from 255 back to zero at a
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* frequency of 614400Hz. We do this *early* in the
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* initialisation process.
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*/
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MFP->mf_tbcr = 0; /* Stop timer */
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MFP->mf_iera &= ~IA_TIMB; /* Disable timer interrupts */
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MFP->mf_tbdr = 0;
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MFP->mf_tbcr = T_Q004; /* Start timer */
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/*
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* Initialize the time structure
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*/
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time.tv_sec = 0;
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time.tv_usec = 0;
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return 0;
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}
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if(!strcmp("clock", auxp))
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return(1);
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return(0);
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}
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/*
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* Start the real-time clock.
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*/
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void clockattach(pdp, dp, auxp)
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struct device *pdp, *dp;
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void *auxp;
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{
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struct clock_softc *sc = (void *)dp;
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sc->sc_flags = 0;
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/*
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* Initialize Timer-A in the ST-MFP. We use a divisor of 200.
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* The MFP clock runs at 2457600Hz. Therefore the timer runs
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* at an effective rate of: 2457600/200 = 12288Hz. The
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* following expression works for 48, 64 or 96 hz.
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*/
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divisor = CLOCK_HZ/hz;
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MFP->mf_tacr = 0; /* Stop timer */
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MFP->mf_iera &= ~IA_TIMA; /* Disable timer interrupts */
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MFP->mf_tadr = divisor; /* Set divisor */
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if (hz != 48 && hz != 64 && hz != 96) { /* XXX */
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printf (": illegal value %d for systemclock, reset to %d\n\t",
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hz, 64);
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hz = 64;
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}
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printf(": system hz %d timer-A divisor 200/%d\n", hz, divisor);
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#ifdef STATCLOCK
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if ((stathz == 0) || (stathz > hz) || (CLOCK_HZ % stathz))
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stathz = hz;
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if ((profhz == 0) || (profhz > (hz << 1)) || (CLOCK_HZ % profhz))
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profhz = hz << 1;
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MFP->mf_tcdcr &= 0x7; /* Stop timer */
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MFP->mf_ierb &= ~IB_TIMC; /* Disable timer inter. */
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MFP->mf_tcdr = CLOCK_HZ/stathz; /* Set divisor */
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statmin = (CLOCK_HZ/stathz) - (statvar >> 1);
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profmin = (CLOCK_HZ/profhz) - (statvar >> 1);
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clk2min = statmin;
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#endif /* STATCLOCK */
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}
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void cpu_initclocks()
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{
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MFP->mf_tacr = T_Q200; /* Start timer */
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MFP->mf_ipra = (u_int8_t)~IA_TIMA;/* Clear pending interrupts */
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MFP->mf_iera |= IA_TIMA; /* Enable timer interrupts */
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MFP->mf_imra |= IA_TIMA; /* ..... */
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#ifdef STATCLOCK
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MFP->mf_tcdcr = (MFP->mf_tcdcr & 0x7) | (T_Q200<<4); /* Start */
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MFP->mf_iprb = (u_int8_t)~IB_TIMC;/* Clear pending interrupts */
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MFP->mf_ierb |= IB_TIMC; /* Enable timer interrupts */
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MFP->mf_imrb |= IB_TIMC; /* ..... */
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#endif /* STATCLOCK */
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}
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void
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setstatclockrate(newhz)
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int newhz;
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{
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#ifdef STATCLOCK
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if (newhz == stathz)
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clk2min = statmin;
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else clk2min = profmin;
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#endif /* STATCLOCK */
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}
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#ifdef STATCLOCK
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void
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statintr(frame)
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struct clockframe frame;
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{
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register int var, r;
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var = statvar - 1;
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do {
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r = random() & var;
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} while(r == 0);
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/*
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* Note that we are always lagging behind as the new divisor
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* value will not be loaded until the next interrupt. This
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* shouldn't disturb the median frequency (I think ;-) ) as
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* only the value used when switching frequencies is used
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* twice. This shouldn't happen very often.
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*/
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MFP->mf_tcdr = clk2min + r;
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statclock(&frame);
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}
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#endif /* STATCLOCK */
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/*
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* Returns number of usec since last recorded clock "tick"
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* (i.e. clock interrupt).
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*/
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long
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clkread()
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{
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u_int delta;
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delta = ((divisor - MFP->mf_tadr) * tick) / divisor;
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/*
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* Account for pending clock interrupts
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*/
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if(MFP->mf_iera & IA_TIMA)
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return(delta + tick);
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return(delta);
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}
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#define TIMB_FREQ 614400
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#define TIMB_LIMIT 256
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/*
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* Wait "n" microseconds.
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* Relies on MFP-Timer B counting down from TIMB_LIMIT at TIMB_FREQ Hz.
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* Note: timer had better have been programmed before this is first used!
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*/
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void
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delay(n)
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int n;
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{
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int tick, otick;
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/*
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* Read the counter first, so that the rest of the setup overhead is
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* counted.
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*/
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otick = MFP->mf_tbdr;
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/*
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* Calculate ((n * TIMER_FREQ) / 1e6) using explicit assembler code so
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* we can take advantage of the intermediate 64-bit quantity to prevent
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* loss of significance.
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*/
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n -= 5;
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if(n < 0)
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return;
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{
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u_int temp;
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__asm __volatile ("mulul %2,%1:%0" : "=d" (n), "=d" (temp)
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: "d" (TIMB_FREQ));
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__asm __volatile ("divul %1,%2:%0" : "=d" (n)
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: "d"(1000000),"d"(temp),"0"(n));
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}
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while(n > 0) {
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tick = MFP->mf_tbdr;
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if(tick > otick)
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n -= TIMB_LIMIT - (tick - otick);
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else n -= otick - tick;
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otick = tick;
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}
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}
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#ifdef GPROF
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/*
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* profclock() is expanded in line in lev6intr() unless profiling kernel.
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* Assumes it is called with clock interrupts blocked.
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*/
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profclock(pc, ps)
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caddr_t pc;
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int ps;
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{
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/*
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* Came from user mode.
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* If this process is being profiled record the tick.
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*/
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if (USERMODE(ps)) {
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if (p->p_stats.p_prof.pr_scale)
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addupc(pc, &curproc->p_stats.p_prof, 1);
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}
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/*
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* Came from kernel (supervisor) mode.
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* If we are profiling the kernel, record the tick.
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*/
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else if (profiling < 2) {
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register int s = pc - s_lowpc;
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if (s < s_textsize)
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kcount[s / (HISTFRACTION * sizeof (*kcount))]++;
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}
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/*
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* Kernel profiling was on but has been disabled.
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* Mark as no longer profiling kernel and if all profiling done,
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* disable the clock.
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*/
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if (profiling && (profon & PRF_KERNEL)) {
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profon &= ~PRF_KERNEL;
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if (profon == PRF_NONE)
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stopprofclock();
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}
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}
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#endif
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/***********************************************************************
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* Real Time Clock support *
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***********************************************************************/
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u_int mc146818_read(rtc, regno)
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void *rtc;
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u_int regno;
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{
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((struct rtc *)rtc)->rtc_regno = regno;
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return(((struct rtc *)rtc)->rtc_data & 0377);
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}
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void mc146818_write(rtc, regno, value)
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void *rtc;
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u_int regno, value;
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{
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((struct rtc *)rtc)->rtc_regno = regno;
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((struct rtc *)rtc)->rtc_data = value;
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}
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/*
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* Initialize the time of day register, assuming the RTC runs in UTC.
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* Since we've got the 'rtc' device, this functionality should be removed
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* from the kernel. The only problem to be solved before that can happen
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* is the possibility of init(1) providing a way (rc.boot?) to set
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* the RTC before single-user mode is entered.
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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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/* Battery clock does not store usec's, so forget about it. */
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time.tv_sec = gettod();
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time.tv_usec = 0;
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}
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/*
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* Function turned into a No-op. Use /dev/rtc to update the RTC.
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*/
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void
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resettodr()
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{
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return;
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}
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static u_long
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gettod()
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{
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int sps;
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mc_todregs clkregs;
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struct clock_ymdhms dt;
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sps = splhigh();
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MC146818_GETTOD(RTC, &clkregs);
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splx(sps);
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if(clkregs[MC_SEC] > 59)
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return(0);
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if(clkregs[MC_MIN] > 59)
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return(0);
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if(clkregs[MC_HOUR] > 23)
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return(0);
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if(range_test(clkregs[MC_DOM], 1, 31))
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return(0);
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if (range_test(clkregs[MC_MONTH], 1, 12))
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return(0);
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if(clkregs[MC_YEAR] > (2000 - GEMSTARTOFTIME))
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return(0);
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dt.dt_year = clkregs[MC_YEAR] + GEMSTARTOFTIME;
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dt.dt_mon = clkregs[MC_MONTH];
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dt.dt_day = clkregs[MC_DOM];
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dt.dt_hour = clkregs[MC_HOUR];
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dt.dt_min = clkregs[MC_MIN];
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dt.dt_sec = clkregs[MC_SEC];
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return(clock_ymdhms_to_secs(&dt));
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}
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/***********************************************************************
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* RTC-device support *
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***********************************************************************/
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int
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rtcopen(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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int unit = minor(dev);
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struct clock_softc *sc;
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if (unit >= clock_cd.cd_ndevs)
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return ENXIO;
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sc = clock_cd.cd_devs[unit];
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if (!sc)
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return ENXIO;
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if (sc->sc_flags & RTC_OPEN)
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return EBUSY;
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sc->sc_flags = RTC_OPEN;
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return 0;
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}
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int
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rtcclose(dev, flag, mode, p)
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dev_t dev;
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int flag;
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int mode;
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struct proc *p;
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{
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int unit = minor(dev);
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struct clock_softc *sc = clock_cd.cd_devs[unit];
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sc->sc_flags = 0;
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return 0;
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}
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int
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rtcread(dev, uio, flags)
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dev_t dev;
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struct uio *uio;
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int flags;
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{
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struct clock_softc *sc;
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mc_todregs clkregs;
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int s, length;
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char buffer[16];
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sc = clock_cd.cd_devs[minor(dev)];
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s = splhigh();
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MC146818_GETTOD(RTC, &clkregs);
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splx(s);
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sprintf(buffer, "%4d%02d%02d%02d%02d.%02d\n",
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clkregs[MC_YEAR] + GEMSTARTOFTIME,
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clkregs[MC_MONTH], clkregs[MC_DOM],
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clkregs[MC_HOUR], clkregs[MC_MIN], clkregs[MC_SEC]);
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if (uio->uio_offset > strlen(buffer))
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return 0;
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length = strlen(buffer) - uio->uio_offset;
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if (length > uio->uio_resid)
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length = uio->uio_resid;
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return(uiomove((caddr_t)buffer, length, uio));
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}
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static int
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twodigits(buffer, pos)
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char *buffer;
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int pos;
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{
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int result = 0;
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if (buffer[pos] >= '0' && buffer[pos] <= '9')
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result = (buffer[pos] - '0') * 10;
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if (buffer[pos+1] >= '0' && buffer[pos+1] <= '9')
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result += (buffer[pos+1] - '0');
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return(result);
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}
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int
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rtcwrite(dev, uio, flags)
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dev_t dev;
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struct uio *uio;
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int flags;
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{
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mc_todregs clkregs;
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int s, length, error;
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char buffer[16];
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/*
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* We require atomic updates!
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*/
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length = uio->uio_resid;
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if (uio->uio_offset || (length != sizeof(buffer)
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&& length != sizeof(buffer - 1)))
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|
return(EINVAL);
|
|
|
|
if ((error = uiomove((caddr_t)buffer, sizeof(buffer), uio)))
|
|
return(error);
|
|
|
|
if (length == sizeof(buffer) && buffer[sizeof(buffer) - 1] != '\n')
|
|
return(EINVAL);
|
|
|
|
s = splclock();
|
|
MC146818_GETTOD(RTC, &clkregs);
|
|
splx(s);
|
|
|
|
clkregs[MC_SEC] = twodigits(buffer, 13);
|
|
clkregs[MC_MIN] = twodigits(buffer, 10);
|
|
clkregs[MC_HOUR] = twodigits(buffer, 8);
|
|
clkregs[MC_DOM] = twodigits(buffer, 6);
|
|
clkregs[MC_MONTH] = twodigits(buffer, 4);
|
|
s = twodigits(buffer, 0) * 100 + twodigits(buffer, 2);
|
|
clkregs[MC_YEAR] = s - GEMSTARTOFTIME;
|
|
|
|
s = splclock();
|
|
MC146818_PUTTOD(RTC, &clkregs);
|
|
splx(s);
|
|
|
|
return(0);
|
|
}
|