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/*-
* 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/clock.h>
#include <sys/timetc.h>
#include <sys/interrupt.h>
#include <machine/clock.h>
#include <machine/psl.h>
#include <machine/spr.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;
#define DIFF19041970 2082844800
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 */
};
void
decr_intr(struct trapframe *frame)
{
u_long msr;
/*
* Check whether we are initialized.
*/
if (!ticks_per_intr)
return;
/*
* Interrupt handler must reset DIS to avoid getting another
* interrupt once EE is enabled.
*/
mtspr(SPR_TSR, TSR_DIS);
/*
* Reenable interrupts
*/
msr = mfmsr();
mtmsr(msr | PSL_EE);
hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
}
void
cpu_initclocks(void)
{
return;
}
void
decr_config (unsigned long freq)
{
ticks_per_sec = freq;
decr_timecounter.tc_frequency = freq;
}
void
decr_init (void)
{
unsigned int msr;
/*
* Should check for correct CPU here? XXX
*/
msr = mfmsr();
mtmsr(msr & ~(PSL_EE));
tc_init(&decr_timecounter);
ns_per_tick = 1000000000 / ticks_per_sec;
ticks_per_intr = ticks_per_sec / hz;
mtdec(ticks_per_intr);
mtspr(SPR_DECAR, ticks_per_intr);
mtspr(SPR_TCR, mfspr(SPR_TCR) | TCR_DIE | TCR_ARE);
mtmsr(msr);
}
static __inline u_quad_t
mftb (void)
{
u_long scratch;
u_quad_t tb;
__asm__ __volatile__(
"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)
{
quad_t tb;
tb = mftb();
return tb;
}
/*
* Wait for about n microseconds (at least!).
*/
void
DELAY(int n)
{
u_quad_t start, end, now;
#define USECS_IN_SEC 1000000ULL
if (n > USECS_IN_SEC) {
printf("WARNING: %s(%d) called from %p", __func__, n,
__builtin_return_address(0));
}
start = mftb();
end = start + (u_quad_t)ticks_per_sec / ( USECS_IN_SEC / n);
do {
now = mftb();
} while (now < end || (now > start && end < start));
}
/*
* Nothing to do.
*/
void
cpu_startprofclock(void)
{
/* Do nothing */
}
void
cpu_stopprofclock(void)
{
}
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