468 lines
12 KiB
C
468 lines
12 KiB
C
/* $NetBSD: clock.c,v 1.3 1995/05/28 19:38:49 leo Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1988 University of Utah.
|
|
* Copyright (c) 1982, 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
|
|
* Science Department.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: Utah $Hdr: clock.c 1.18 91/01/21$
|
|
*
|
|
* @(#)clock.c 7.6 (Berkeley) 5/7/91
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/device.h>
|
|
#include <machine/psl.h>
|
|
#include <machine/cpu.h>
|
|
#include <machine/iomap.h>
|
|
#include <machine/mfp.h>
|
|
#include <atari/dev/clockreg.h>
|
|
|
|
#if defined(PROF) && defined(PROFTIMER)
|
|
#include <sys/PROF.h>
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Machine-dependent clock routines.
|
|
*
|
|
* Startrtclock restarts the real-time clock, which provides
|
|
* hardclock interrupts to kern_clock.c.
|
|
*
|
|
* Inittodr initializes the time of day hardware which provides
|
|
* date functions.
|
|
*
|
|
* Resettodr restores the time of day hardware after a time change.
|
|
*
|
|
* A note on the real-time clock:
|
|
* We actually load the clock with CLK_INTERVAL-1 instead of CLK_INTERVAL.
|
|
* This is because the counter decrements to zero after N+1 enabled clock
|
|
* periods where N is the value loaded into the counter.
|
|
*/
|
|
|
|
int clockmatch __P((struct device *, struct cfdata *, void *));
|
|
void clockattach __P((struct device *, struct device *, void *));
|
|
|
|
struct cfdriver clockcd = {
|
|
NULL, "clock", (cfmatch_t)clockmatch, clockattach,
|
|
DV_DULL, sizeof(struct device), NULL, 0
|
|
};
|
|
|
|
static u_long gettod __P((void));
|
|
static int settod __P((u_long));
|
|
|
|
static int divisor;
|
|
|
|
int
|
|
clockmatch(pdp, cfp, auxp)
|
|
struct device *pdp;
|
|
struct cfdata *cfp;
|
|
void *auxp;
|
|
{
|
|
if(!strcmp("clock", auxp))
|
|
return(1);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Start the real-time clock.
|
|
*/
|
|
void clockattach(pdp, dp, auxp)
|
|
struct device *pdp, *dp;
|
|
void *auxp;
|
|
{
|
|
/*
|
|
* Initialize Timer-A in the ST-MFP. We use a divisor of 200.
|
|
* The MFP clock runs at 2457600Hz. Therefore the timer runs
|
|
* at an effective rate of: 2457600/200 = 12288Hz. The
|
|
* following expression works for 48, 64 or 96 hz.
|
|
*/
|
|
divisor = 12288/hz;
|
|
MFP->mf_tacr = 0; /* Stop timer */
|
|
MFP->mf_iera &= ~IA_TIMA; /* Disable timer interrupts */
|
|
MFP->mf_tadr = divisor; /* Set divisor */
|
|
|
|
printf(": system hz %d timer-A divisor 200/%d\n", hz, divisor);
|
|
|
|
/*
|
|
* Initialize Timer-B in the ST-MFP. This timer is used by the 'delay'
|
|
* function below. This time is setup to be continueously counting from
|
|
* 255 back to zero at a frequency of 614400Hz.
|
|
*/
|
|
MFP->mf_tbcr = 0; /* Stop timer */
|
|
MFP->mf_iera &= ~IA_TIMB; /* Disable timer interrupts */
|
|
MFP->mf_tbdr = 0;
|
|
MFP->mf_tbcr = T_Q004; /* Start timer */
|
|
|
|
}
|
|
|
|
void cpu_initclocks()
|
|
{
|
|
MFP->mf_tacr = T_Q200; /* Start timer */
|
|
MFP->mf_ipra &= ~IA_TIMA; /* Clear pending interrupts */
|
|
MFP->mf_iera |= IA_TIMA; /* Enable timer interrupts */
|
|
MFP->mf_imra |= IA_TIMA; /* ..... */
|
|
}
|
|
|
|
setstatclockrate(hz)
|
|
int hz;
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Returns number of usec since last recorded clock "tick"
|
|
* (i.e. clock interrupt).
|
|
*/
|
|
clkread()
|
|
{
|
|
u_int delta;
|
|
|
|
delta = ((divisor - MFP->mf_tadr) * tick) / divisor;
|
|
/*
|
|
* Account for pending clock interrupts
|
|
*/
|
|
if(MFP->mf_iera & IA_TIMA)
|
|
return(delta + tick);
|
|
return(delta);
|
|
}
|
|
|
|
#define TIMB_FREQ 614400
|
|
#define TIMB_LIMIT 256
|
|
|
|
/*
|
|
* Wait "n" microseconds.
|
|
* Relies on MFP-Timer B counting down from TIMB_LIMIT at TIMB_FREQ Hz.
|
|
* Note: timer had better have been programmed before this is first used!
|
|
*/
|
|
void delay(n)
|
|
int n;
|
|
{
|
|
int tick, otick;
|
|
|
|
/*
|
|
* Read the counter first, so that the rest of the setup overhead is
|
|
* counted.
|
|
*/
|
|
otick = MFP->mf_tbdr;
|
|
|
|
/*
|
|
* Calculate ((n * TIMER_FREQ) / 1e6) using explicit assembler code so
|
|
* we can take advantage of the intermediate 64-bit quantity to prevent
|
|
* loss of significance.
|
|
*/
|
|
n -= 5;
|
|
if(n < 0)
|
|
return;
|
|
{
|
|
u_int temp;
|
|
|
|
__asm __volatile ("mulul %2,%1:%0" : "=d" (n), "=d" (temp)
|
|
: "d" (TIMB_FREQ));
|
|
__asm __volatile ("divul %1,%2:%0" : "=d" (n)
|
|
: "d"(1000000),"d"(temp),"0"(n));
|
|
}
|
|
|
|
while(n > 0) {
|
|
tick = MFP->mf_tbdr;
|
|
if(tick > otick)
|
|
n -= TIMB_LIMIT - (tick - otick);
|
|
else n -= otick - tick;
|
|
otick = tick;
|
|
}
|
|
}
|
|
|
|
#ifdef PROFTIMER
|
|
/*
|
|
* This code allows the amiga kernel to use one of the extra timers on
|
|
* the clock chip for profiling, instead of the regular system timer.
|
|
* The advantage of this is that the profiling timer can be turned up to
|
|
* a higher interrupt rate, giving finer resolution timing. The profclock
|
|
* routine is called from the lev6intr in locore, and is a specialized
|
|
* routine that calls addupc. The overhead then is far less than if
|
|
* hardclock/softclock was called. Further, the context switch code in
|
|
* locore has been changed to turn the profile clock on/off when switching
|
|
* into/out of a process that is profiling (startprofclock/stopprofclock).
|
|
* This reduces the impact of the profiling clock on other users, and might
|
|
* possibly increase the accuracy of the profiling.
|
|
*/
|
|
int profint = PRF_INTERVAL; /* Clock ticks between interrupts */
|
|
int profscale = 0; /* Scale factor from sys clock to prof clock */
|
|
char profon = 0; /* Is profiling clock on? */
|
|
|
|
/* profon values - do not change, locore.s assumes these values */
|
|
#define PRF_NONE 0x00
|
|
#define PRF_USER 0x01
|
|
#define PRF_KERNEL 0x80
|
|
|
|
initprofclock()
|
|
{
|
|
#if NCLOCK > 0
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
/*
|
|
* If the high-res timer is running, force profiling off.
|
|
* Unfortunately, this gets reflected back to the user not as
|
|
* an error but as a lack of results.
|
|
*/
|
|
if (clockon) {
|
|
p->p_stats->p_prof.pr_scale = 0;
|
|
return;
|
|
}
|
|
/*
|
|
* Keep track of the number of user processes that are profiling
|
|
* by checking the scale value.
|
|
*
|
|
* XXX: this all assumes that the profiling code is well behaved;
|
|
* i.e. profil() is called once per process with pcscale non-zero
|
|
* to turn it on, and once with pcscale zero to turn it off.
|
|
* Also assumes you don't do any forks or execs. Oh well, there
|
|
* is always adb...
|
|
*/
|
|
if (p->p_stats->p_prof.pr_scale)
|
|
profprocs++;
|
|
else
|
|
profprocs--;
|
|
#endif
|
|
/*
|
|
* The profile interrupt interval must be an even divisor
|
|
* of the CLK_INTERVAL so that scaling from a system clock
|
|
* tick to a profile clock tick is possible using integer math.
|
|
*/
|
|
if (profint > CLK_INTERVAL || (CLK_INTERVAL % profint) != 0)
|
|
profint = CLK_INTERVAL;
|
|
profscale = CLK_INTERVAL / profint;
|
|
}
|
|
|
|
startprofclock()
|
|
{
|
|
unsigned short interval;
|
|
|
|
/* stop timer B */
|
|
ciab.crb = ciab.crb & 0xc0;
|
|
|
|
/* load interval into registers.
|
|
the clocks run at NTSC: 715.909kHz or PAL: 709.379kHz */
|
|
|
|
interval = profint - 1;
|
|
|
|
/* order of setting is important ! */
|
|
ciab.tblo = interval & 0xff;
|
|
ciab.tbhi = interval >> 8;
|
|
|
|
/* enable interrupts for timer B */
|
|
ciab.icr = (1<<7) | (1<<1);
|
|
|
|
/* start timer B in continuous shot mode */
|
|
ciab.crb = (ciab.crb & 0xc0) | 1;
|
|
}
|
|
|
|
stopprofclock()
|
|
{
|
|
/* stop timer B */
|
|
ciab.crb = ciab.crb & 0xc0;
|
|
}
|
|
|
|
#ifdef PROF
|
|
/*
|
|
* profclock() is expanded in line in lev6intr() unless profiling kernel.
|
|
* Assumes it is called with clock interrupts blocked.
|
|
*/
|
|
profclock(pc, ps)
|
|
caddr_t pc;
|
|
int ps;
|
|
{
|
|
/*
|
|
* Came from user mode.
|
|
* If this process is being profiled record the tick.
|
|
*/
|
|
if (USERMODE(ps)) {
|
|
if (p->p_stats.p_prof.pr_scale)
|
|
addupc(pc, &curproc->p_stats.p_prof, 1);
|
|
}
|
|
/*
|
|
* Came from kernel (supervisor) mode.
|
|
* If we are profiling the kernel, record the tick.
|
|
*/
|
|
else if (profiling < 2) {
|
|
register int s = pc - s_lowpc;
|
|
|
|
if (s < s_textsize)
|
|
kcount[s / (HISTFRACTION * sizeof (*kcount))]++;
|
|
}
|
|
/*
|
|
* Kernel profiling was on but has been disabled.
|
|
* Mark as no longer profiling kernel and if all profiling done,
|
|
* disable the clock.
|
|
*/
|
|
if (profiling && (profon & PRF_KERNEL)) {
|
|
profon &= ~PRF_KERNEL;
|
|
if (profon == PRF_NONE)
|
|
stopprofclock();
|
|
}
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
/*
|
|
* Initialize the time of day register, based on the time base which is, e.g.
|
|
* from a filesystem.
|
|
*/
|
|
inittodr(base)
|
|
time_t base;
|
|
{
|
|
u_long timbuf = base; /* assume no battery clock exists */
|
|
|
|
timbuf = gettod();
|
|
|
|
if(timbuf < base) {
|
|
printf("WARNING: bad date in battery clock\n");
|
|
timbuf = base;
|
|
}
|
|
|
|
/* Battery clock does not store usec's, so forget about it. */
|
|
time.tv_sec = timbuf;
|
|
}
|
|
|
|
resettodr()
|
|
{
|
|
if(settod(time.tv_sec) == 1)
|
|
return;
|
|
printf("Cannot set battery backed clock\n");
|
|
}
|
|
|
|
static char dmsize[12] =
|
|
{
|
|
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
|
|
};
|
|
|
|
static char ldmsize[12] =
|
|
{
|
|
31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
|
|
};
|
|
|
|
static u_long
|
|
gettod()
|
|
{
|
|
int i, sps;
|
|
u_long new_time = 0;
|
|
char *msize;
|
|
mc_todregs clkregs;
|
|
|
|
sps = splhigh();
|
|
MC146818_GETTOD(RTC, &clkregs);
|
|
splx(sps);
|
|
|
|
if(range_test(clkregs[MC_HOUR], 0, 23))
|
|
return(0);
|
|
if(range_test(clkregs[MC_DOM], 1, 31))
|
|
return(0);
|
|
if (range_test(clkregs[MC_MONTH], 1, 12))
|
|
return(0);
|
|
if(range_test(clkregs[MC_YEAR], 0, 2000 - GEMSTARTOFTIME))
|
|
return(0);
|
|
clkregs[MC_YEAR] += GEMSTARTOFTIME;
|
|
|
|
for(i = BSDSTARTOFTIME; i < clkregs[MC_YEAR]; i++) {
|
|
if(is_leap(i))
|
|
new_time += 366;
|
|
else new_time += 365;
|
|
}
|
|
|
|
msize = is_leap(clkregs[MC_YEAR]) ? ldmsize : dmsize;
|
|
for(i = 0; i < (clkregs[MC_MONTH] - 1); i++)
|
|
new_time += msize[i];
|
|
new_time += clkregs[MC_DOM] - 1;
|
|
new_time *= SECS_DAY;
|
|
new_time += (clkregs[MC_HOUR] * 3600) + (clkregs[MC_MIN] * 60);
|
|
return(new_time + clkregs[MC_SEC]);
|
|
}
|
|
|
|
static int
|
|
settod(newtime)
|
|
u_long newtime;
|
|
{
|
|
register long days, rem, year;
|
|
register char *ml;
|
|
int sps, sec, min, hour, month;
|
|
mc_todregs clkregs;
|
|
|
|
/* Number of days since Jan. 1 'BSDSTARTOFTIME' */
|
|
days = newtime / SECS_DAY;
|
|
rem = newtime % SECS_DAY;
|
|
|
|
/*
|
|
* Calculate sec, min, hour
|
|
*/
|
|
hour = rem / SECS_HOUR;
|
|
rem %= SECS_HOUR;
|
|
min = rem / 60;
|
|
sec = rem % 60;
|
|
|
|
/*
|
|
* Figure out the year. Day in year is left in 'days'.
|
|
*/
|
|
year = BSDSTARTOFTIME;
|
|
while(days >= (rem = is_leap(year) ? 366 : 365)) {
|
|
++year;
|
|
days -= rem;
|
|
}
|
|
|
|
/*
|
|
* Determine the month
|
|
*/
|
|
ml = is_leap(year) ? ldmsize : dmsize;
|
|
for(month = 0; days >= ml[month]; ++month)
|
|
days -= ml[month];
|
|
|
|
/*
|
|
* Now that everything is calculated, program the RTC
|
|
*/
|
|
mc146818_write(RTC, MC_REGA, MC_BASE_32_KHz);
|
|
mc146818_write(RTC, MC_REGB, MC_REGB_24HR | MC_REGB_BINARY);
|
|
sps = splhigh();
|
|
MC146818_GETTOD(RTC, &clkregs);
|
|
clkregs[MC_SEC] = sec;
|
|
clkregs[MC_MIN] = min;
|
|
clkregs[MC_HOUR] = hour;
|
|
clkregs[MC_DOM] = days+1;
|
|
clkregs[MC_MONTH] = month+1;
|
|
clkregs[MC_YEAR] = year - GEMSTARTOFTIME;
|
|
MC146818_PUTTOD(RTC, &clkregs);
|
|
splx(sps);
|
|
|
|
return(1);
|
|
}
|