342 lines
8.1 KiB
C
342 lines
8.1 KiB
C
/*-
|
|
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
|
|
* Copyright (C) 1995, 1996 TooLs GmbH.
|
|
* All rights reserved.
|
|
*
|
|
* 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 TooLs GmbH.
|
|
* 4. The name of TooLs GmbH may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
|
|
*
|
|
* $NetBSD: clock.c,v 1.9 2000/01/19 02:52:19 msaitoh Exp $
|
|
*/
|
|
/*
|
|
* Copyright (C) 2001 Benno Rice.
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY Benno Rice ``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 TOOLS GMBH 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/timetc.h>
|
|
#include <sys/interrupt.h>
|
|
|
|
#include <dev/ofw/openfirm.h>
|
|
|
|
#include <machine/cpu.h>
|
|
#include <machine/intr.h>
|
|
#include <machine/md_var.h>
|
|
|
|
/*
|
|
* Initially we assume a processor with a bus frequency of 12.5 MHz.
|
|
*/
|
|
u_int tickspending;
|
|
u_long ns_per_tick = 80;
|
|
static u_long ticks_per_sec = 12500000;
|
|
static long ticks_per_intr;
|
|
static volatile u_long lasttb;
|
|
|
|
static int sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS);
|
|
|
|
int wall_cmos_clock; /* wall CMOS clock assumed if != 0 */
|
|
SYSCTL_INT(_machdep, OID_AUTO, wall_cmos_clock,
|
|
CTLFLAG_RW, &wall_cmos_clock, 0, "");
|
|
|
|
int adjkerntz; /* local offset from GMT in seconds */
|
|
SYSCTL_PROC(_machdep, OID_AUTO, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
|
|
&adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
|
|
|
|
#define SECDAY 86400
|
|
#define DIFF19041970 2082844800
|
|
|
|
static int clockinitted = 0;
|
|
|
|
static timecounter_get_t decr_get_timecount;
|
|
|
|
static struct timecounter decr_timecounter = {
|
|
decr_get_timecount, /* get_timecount */
|
|
0, /* no poll_pps */
|
|
~0u, /* counter_mask */
|
|
0, /* frequency */
|
|
"decrementer" /* name */
|
|
};
|
|
|
|
static int
|
|
sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error;
|
|
|
|
error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
|
|
if (!error && req->newptr)
|
|
resettodr();
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
inittodr(time_t base)
|
|
{
|
|
time_t deltat;
|
|
u_int rtc_time;
|
|
struct timespec ts;
|
|
phandle_t phandle;
|
|
ihandle_t ihandle;
|
|
char rtcpath[128];
|
|
u_int rtcsecs;
|
|
|
|
/*
|
|
* If we can't read from RTC, use the fs time.
|
|
*/
|
|
phandle = OF_finddevice("rtc");
|
|
if (phandle != -1) {
|
|
OF_package_to_path(phandle, rtcpath, sizeof(rtcpath));
|
|
ihandle = OF_open(rtcpath);
|
|
if (ihandle != -1) {
|
|
if (OF_call_method("read-rtc", ihandle,
|
|
0, 1, &rtcsecs))
|
|
printf("RTC call method error\n");
|
|
else {
|
|
ts.tv_sec = rtcsecs - DIFF19041970;
|
|
ts.tv_nsec = 0;
|
|
tc_setclock(&ts);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
{
|
|
ts.tv_sec = base;
|
|
ts.tv_nsec = 0;
|
|
tc_setclock(&ts);
|
|
return;
|
|
}
|
|
clockinitted = 1;
|
|
ts.tv_sec = rtc_time - DIFF19041970;
|
|
|
|
deltat = ts.tv_sec - base;
|
|
if (deltat < 0) {
|
|
deltat = -deltat;
|
|
}
|
|
if (deltat < 2 * SECDAY) {
|
|
tc_setclock(&ts);
|
|
return;
|
|
}
|
|
|
|
printf("WARNING: clock %s %d days",
|
|
ts.tv_sec < base ? "lost" : "gained", (int)(deltat / SECDAY));
|
|
|
|
printf(" -- CHECK AND RESET THE DATE!\n");
|
|
}
|
|
|
|
/*
|
|
* Similar to the above
|
|
*/
|
|
void
|
|
resettodr()
|
|
{
|
|
|
|
}
|
|
|
|
void
|
|
decr_intr(struct trapframe *frame)
|
|
{
|
|
u_long tb;
|
|
long tick;
|
|
int nticks;
|
|
|
|
/*
|
|
* Check whether we are initialized.
|
|
*/
|
|
if (!ticks_per_intr)
|
|
return;
|
|
|
|
/*
|
|
* Based on the actual time delay since the last decrementer reload,
|
|
* we arrange for earlier interrupt next time.
|
|
*/
|
|
__asm ("mftb %0; mfdec %1" : "=r"(tb), "=r"(tick));
|
|
for (nticks = 0; tick < 0; nticks++)
|
|
tick += ticks_per_intr;
|
|
mtdec(tick);
|
|
/*
|
|
* lasttb is used during microtime. Set it to the virtual
|
|
* start of this tick interval.
|
|
*/
|
|
lasttb = tb + tick - ticks_per_intr;
|
|
|
|
nticks += tickspending;
|
|
tickspending = 0;
|
|
|
|
/*
|
|
* Reenable interrupts
|
|
*/
|
|
#if 0
|
|
msr = mfmsr();
|
|
mtmsr(msr | PSL_EE | PSL_RI);
|
|
#endif
|
|
/*
|
|
* Do standard timer interrupt stuff.
|
|
* Do softclock stuff only on the last iteration.
|
|
*/
|
|
#if 0
|
|
while (--nticks > 0) {
|
|
hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
|
|
}
|
|
#endif
|
|
hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
|
|
}
|
|
|
|
void
|
|
cpu_initclocks(void)
|
|
{
|
|
|
|
return;
|
|
}
|
|
|
|
void
|
|
decr_init(void)
|
|
{
|
|
int qhandle, phandle;
|
|
char name[32];
|
|
unsigned int msr;
|
|
|
|
phandle = 0;
|
|
|
|
/*
|
|
* Get this info during autoconf? XXX
|
|
*/
|
|
for (qhandle = OF_peer(0); qhandle; qhandle = phandle) {
|
|
if (OF_getprop(qhandle, "device_type", name, sizeof name) >= 0
|
|
&& !strcmp(name, "cpu")
|
|
&& OF_getprop(qhandle, "timebase-frequency",
|
|
&ticks_per_sec, sizeof ticks_per_sec) >= 0) {
|
|
/*
|
|
* Should check for correct CPU here? XXX
|
|
*/
|
|
msr = mfmsr();
|
|
mtmsr(msr & ~(PSL_EE|PSL_RI));
|
|
|
|
decr_timecounter.tc_frequency = ticks_per_sec;
|
|
tc_init(&decr_timecounter);
|
|
|
|
ns_per_tick = 1000000000 / ticks_per_sec;
|
|
ticks_per_intr = ticks_per_sec / hz;
|
|
__asm __volatile ("mftb %0" : "=r"(lasttb));
|
|
mtdec(ticks_per_intr);
|
|
|
|
mtmsr(msr);
|
|
|
|
break;
|
|
}
|
|
if ((phandle = OF_child(qhandle)))
|
|
continue;
|
|
while (qhandle) {
|
|
if ((phandle = OF_peer(qhandle)))
|
|
break;
|
|
qhandle = OF_parent(qhandle);
|
|
}
|
|
}
|
|
if (!phandle)
|
|
panic("no cpu node");
|
|
}
|
|
|
|
static __inline u_quad_t
|
|
mftb(void)
|
|
{
|
|
u_long scratch;
|
|
u_quad_t tb;
|
|
|
|
__asm ("1: mftbu %0; mftb %0+1; mftbu %1; cmpw 0,%0,%1; bne 1b"
|
|
: "=r"(tb), "=r"(scratch));
|
|
return tb;
|
|
}
|
|
|
|
static unsigned
|
|
decr_get_timecount(struct timecounter *tc)
|
|
{
|
|
return mftb();
|
|
}
|
|
|
|
/*
|
|
* Wait for about n microseconds (at least!).
|
|
*/
|
|
void
|
|
DELAY(int n)
|
|
{
|
|
u_quad_t tb, ttb;
|
|
|
|
tb = mftb();
|
|
ttb = tb + (n * 1000 + ns_per_tick - 1) / ns_per_tick;
|
|
while (tb < ttb)
|
|
tb = mftb();
|
|
}
|
|
|
|
/*
|
|
* Nothing to do.
|
|
*/
|
|
void
|
|
cpu_startprofclock(void)
|
|
{
|
|
|
|
/* Do nothing */
|
|
}
|
|
|
|
void
|
|
cpu_stopprofclock(void)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* XXX Needed by syscons
|
|
*/
|
|
int
|
|
sysbeep(int pitch, int period)
|
|
{
|
|
|
|
return (0);
|
|
}
|