281 lines
6.9 KiB
C
281 lines
6.9 KiB
C
/* $NetBSD: sa11x0_ost.c,v 1.3 2001/03/09 18:55:29 toshii Exp $ */
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/*
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* Copyright (c) 1997 Mark Brinicombe.
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* Copyright (c) 1997 Causality Limited.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by IWAMOTO Toshihiro and Ichiro FUKUHARA.
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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 NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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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 <sys/device.h>
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#include <machine/bus.h>
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#include <machine/irqhandler.h>
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#include <machine/cpufunc.h>
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#include <machine/katelib.h>
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#include <hpcarm/sa11x0/sa11x0_reg.h>
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#include <hpcarm/sa11x0/sa11x0_var.h>
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#include <hpcarm/sa11x0/sa11x0_ostreg.h>
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static int saost_match(struct device *, struct cfdata *, void *);
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static void saost_attach(struct device *, struct device *, void *);
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int gettick(void);
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int clockintr(void *);
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void rtcinit(void);
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struct saost_softc {
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struct device sc_dev;
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bus_addr_t sc_baseaddr;
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bus_space_tag_t sc_iot;
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bus_space_handle_t sc_ioh;
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u_int32_t sc_clock_count;
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void *sc_clockintr;
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u_int32_t sc_statclock_count;
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void *sc_statclockintr;
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};
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static struct saost_softc *saost_sc = NULL;
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#define TIMER_FREQUENCY 3686400 /* 3.6864MHz */
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#define TICKS_PER_MICROSECOND (TIMER_FREQUENCY/1000000)
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struct cfattach saost_ca = {
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sizeof(struct saost_softc), saost_match, saost_attach
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};
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static int
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saost_match(parent, match, aux)
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struct device *parent;
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struct cfdata *match;
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void *aux;
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{
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return(0);
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}
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void
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saost_attach(parent, self, aux)
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struct device *parent;
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struct device *self;
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void *aux;
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{
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struct saost_softc *sc = (struct saost_softc*)self;
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struct sa11x0_attach_args *sa = aux;
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sc->sc_iot = sa->sa_iot;
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sc->sc_baseaddr = sa->sa_addr;
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saost_sc = sc;
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if(bus_space_map(sa->sa_iot, sa->sa_addr, sa->sa_size, 0,
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&sc->sc_ioh))
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panic("%s: Cannot map registers\n", self->dv_xname);
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printf("%s: SA-11x0 OS Timer\n", sc->sc_dev.dv_xname);
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}
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int
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clockintr(arg)
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void *arg;
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{
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struct clockframe *frame = arg;
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u_int32_t oscr, nextmatch, oldmatch;
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bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
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SAOST_SR, 1);
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hardclock(frame);
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/* schedule next clock intr */
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oldmatch = saost_sc->sc_clock_count;
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nextmatch = oldmatch + TIMER_FREQUENCY / hz;
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oscr = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
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SAOST_CR);
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/* XXX it will take some time to return from intr */
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oscr += 100;
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if ((nextmatch > oldmatch &&
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(oscr > nextmatch || oscr < oldmatch)) ||
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(nextmatch < oldmatch && oscr > nextmatch && oscr < oldmatch)) {
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/* we were late to handle this intr */
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/* XXX adjust clock to compensate lost hardclock() calls */
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/* XXX is this ok? */
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nextmatch = oscr + TIMER_FREQUENCY / hz;
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}
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saost_sc->sc_clock_count = nextmatch;
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bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_MR0,
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nextmatch);
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return(-1);
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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 timer_count, enable;
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timer_count = TIMER_FREQUENCY / hz;
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enable = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
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SAOST_IR);
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enable |= 2;
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bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
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SAOST_IR, enable);
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bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
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SAOST_MR1, timer_count);
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saost_sc->sc_statclock_count = timer_count;
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}
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void
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cpu_initclocks()
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{
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/* initialize saost and setup irq */
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printf("clock: hz=%d stathz = %d profhz = %d\n", hz, stathz, profhz);
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/* Disable reset on timer 3 match */
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bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_CR, 0);
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/* Setup timer 1 and claim interrupt */
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saost_sc->sc_clock_count = TIMER_FREQUENCY / hz;
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bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_IR, 1);
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bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_MR0,
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saost_sc->sc_clock_count);
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sa11x0_intr_establish(0, 26, 1, IPL_CLOCK, clockintr, 0);
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}
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int
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gettick()
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{
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int counter;
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u_int savedints;
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savedints = disable_interrupts(I32_bit);
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counter = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
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SAOST_CR);
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restore_interrupts(savedints);
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return counter;
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}
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void
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microtime(tvp)
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register struct timeval *tvp;
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{
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int s = splhigh();
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int tm;
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int deltatm;
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static struct timeval lasttime;
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tm = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
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SAOST_CR);
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deltatm = saost_sc->sc_clock_count - tm;
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#ifdef DEBUG
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printf("deltatm = %d\n",deltatm);
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#endif
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*tvp = time;
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tvp->tv_usec++; /* XXX */
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while (tvp->tv_usec >= 1000000) {
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tvp->tv_sec++;
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tvp->tv_usec -= 1000000;
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}
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if (tvp->tv_sec == lasttime.tv_sec &&
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tvp->tv_usec <= lasttime.tv_usec &&
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(tvp->tv_usec = lasttime.tv_usec + 1) >= 1000000)
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{
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tvp->tv_sec++;
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tvp->tv_usec -= 1000000;
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}
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lasttime = *tvp;
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splx(s);
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}
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void
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delay(usecs)
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u_int usecs;
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{
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u_int32_t tick, otick, delta;
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int j, csec, usec;
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csec = usecs / 10000;
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usec = usecs % 10000;
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usecs = (TIMER_FREQUENCY / 100) * csec
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+ (TIMER_FREQUENCY / 100) * usec / 10000;
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if (! saost_sc) {
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/* clock isn't initialized yet */
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for(; usecs > 0; usecs--)
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for(j = 100; j > 0; j--)
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;
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return;
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}
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otick = gettick();
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while (1) {
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for(j = 100; j > 0; j--)
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;
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tick = gettick();
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delta = tick - otick;
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if (delta > usecs)
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break;
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usecs -= delta;
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otick = tick;
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}
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}
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void
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resettodr()
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{
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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.tv_sec = base;
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time.tv_usec = 0;
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}
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