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freebsd/sys/arm/sa11x0/sa11x0_ost.c

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/* $NetBSD: sa11x0_ost.c,v 1.11 2003/07/15 00:24:51 lukem Exp $ */
/*-
* Copyright (c) 1997 Mark Brinicombe.
* Copyright (c) 1997 Causality Limited.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by IWAMOTO Toshihiro and Ichiro FUKUHARA.
*
* 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 NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/time.h>
#include <sys/bus.h>
#include <sys/clock.h>
#include <sys/module.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <machine/intr.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/frame.h>
#include <arm/sa11x0/sa11x0_reg.h>
#include <arm/sa11x0/sa11x0_var.h>
#include <arm/sa11x0/sa11x0_ostreg.h>
static int saost_probe(device_t);
static int saost_attach(device_t);
int gettick(void);
static int clockintr(void *);
#if 0
static int statintr(void *);
#endif
void rtcinit(void);
#if 0
static struct mtx clock_lock;
#endif
struct saost_softc {
device_t sc_dev;
bus_addr_t sc_baseaddr;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
u_int32_t sc_clock_count;
u_int32_t sc_statclock_count;
u_int32_t sc_statclock_step;
};
static struct saost_softc *saost_sc = NULL;
#define TIMER_FREQUENCY 3686400 /* 3.6864MHz */
#define TICKS_PER_MICROSECOND (TIMER_FREQUENCY/1000000)
#ifndef STATHZ
#define STATHZ 64
#endif
static device_method_t saost_methods[] = {
DEVMETHOD(device_probe, saost_probe),
DEVMETHOD(device_attach, saost_attach),
{0, 0},
};
static driver_t saost_driver = {
"saost",
saost_methods,
sizeof(struct saost_softc),
};
static devclass_t saost_devclass;
DRIVER_MODULE(saost, saip, saost_driver, saost_devclass, 0, 0);
static int
saost_probe(device_t dev)
{
return (0);
}
static int
saost_attach(device_t dev)
{
struct saost_softc *sc = device_get_softc(dev);
struct sa11x0_softc *sa = device_get_softc(device_get_parent(dev));
sc->sc_dev = dev;
sc->sc_iot = sa->sc_iot;
sc->sc_baseaddr = 0x90000000;
saost_sc = sc;
if(bus_space_map(sa->sc_iot, sc->sc_baseaddr, 8, 0,
&sc->sc_ioh))
panic("%s: Cannot map registers", device_get_name(dev));
/* disable all channel and clear interrupt status */
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_IR, 0);
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_SR, 0xf);
return (0);
}
static int
clockintr(arg)
void *arg;
{
struct trapframe *frame = arg;
u_int32_t oscr, nextmatch, oldmatch;
int s;
#if 0
mtx_lock_spin(&clock_lock);
#endif
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
SAOST_SR, 1);
/* schedule next clock intr */
oldmatch = saost_sc->sc_clock_count;
nextmatch = oldmatch + TIMER_FREQUENCY / hz;
oscr = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
SAOST_CR);
if ((nextmatch > oldmatch &&
(oscr > nextmatch || oscr < oldmatch)) ||
(nextmatch < oldmatch && oscr > nextmatch && oscr < oldmatch)) {
/*
* we couldn't set the matching register in time.
* just set it to some value so that next interrupt happens.
* XXX is it possible to compansate lost interrupts?
*/
s = splhigh();
oscr = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
SAOST_CR);
nextmatch = oscr + 10;
splx(s);
}
saost_sc->sc_clock_count = nextmatch;
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_MR0,
nextmatch);
hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
#if 0
mtx_unlock_spin(&clock_lock);
#endif
return (FILTER_HANDLED);
}
#if 0
static int
statintr(arg)
void *arg;
{
struct trapframe *frame = arg;
u_int32_t oscr, nextmatch, oldmatch;
int s;
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
SAOST_SR, 2);
/* schedule next clock intr */
oldmatch = saost_sc->sc_statclock_count;
nextmatch = oldmatch + saost_sc->sc_statclock_step;
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_MR1,
nextmatch);
oscr = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
SAOST_CR);
if ((nextmatch > oldmatch &&
(oscr > nextmatch || oscr < oldmatch)) ||
(nextmatch < oldmatch && oscr > nextmatch && oscr < oldmatch)) {
/*
* we couldn't set the matching register in time.
* just set it to some value so that next interrupt happens.
* XXX is it possible to compansate lost interrupts?
*/
s = splhigh();
oscr = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
SAOST_CR);
nextmatch = oscr + 10;
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
SAOST_MR1, nextmatch);
splx(s);
}
saost_sc->sc_statclock_count = nextmatch;
statclock(TRAPF_USERMODE(frame));
return (FILTER_HANDLED);
}
#endif
#if 0
void
setstatclockrate(int hz)
{
u_int32_t count;
saost_sc->sc_statclock_step = TIMER_FREQUENCY / hz;
count = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_CR);
count += saost_sc->sc_statclock_step;
saost_sc->sc_statclock_count = count;
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
SAOST_MR1, count);
}
#endif
void
cpu_initclocks()
{
device_t dev = saost_sc->sc_dev;
stathz = STATHZ;
profhz = stathz;
#if 0
mtx_init(&clock_lock, "SA1110 Clock lock<63>", NULL, MTX_SPIN);
#endif
saost_sc->sc_statclock_step = TIMER_FREQUENCY / stathz;
struct resource *irq1, *irq2;
int rid = 0;
void *ih1/*, *ih2 */;
printf("clock: hz=%d stathz = %d\n", hz, stathz);
/* Use the channels 0 and 1 for hardclock and statclock, respectively */
saost_sc->sc_clock_count = TIMER_FREQUENCY / hz;
saost_sc->sc_statclock_count = TIMER_FREQUENCY / stathz;
irq1 = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0,
~0, 1, RF_ACTIVE);
rid = 1;
irq2 = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
RF_ACTIVE);
bus_setup_intr(dev, irq1, INTR_TYPE_CLK, clockintr, NULL, NULL,
&ih1);
#if 0
bus_setup_intr(dev, irq2, INTR_TYPE_CLK, statintr, NULL, NULL,
,&ih2);
#endif
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_SR, 0xf);
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_IR, 3);
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_MR0,
saost_sc->sc_clock_count);
#if 0
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_MR1,
0);
#endif
/* Zero the counter value */
bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_CR, 0);
}
int
gettick()
{
int counter;
u_int savedints;
savedints = disable_interrupts(I32_bit);
counter = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
SAOST_CR);
restore_interrupts(savedints);
return counter;
}
void
DELAY(usecs)
int usecs;
{
u_int32_t tick, otick, delta;
int j, csec, usec;
csec = usecs / 10000;
usec = usecs % 10000;
usecs = (TIMER_FREQUENCY / 100) * csec
+ (TIMER_FREQUENCY / 100) * usec / 10000;
if (! saost_sc) {
/* clock isn't initialized yet */
for(; usecs > 0; usecs--)
for(j = 100; j > 0; j--)
;
return;
}
#if 0
mtx_lock_spin(&clock_lock);
#endif
otick = gettick();
while (1) {
for(j = 100; j > 0; j--)
;
tick = gettick();
delta = tick - otick;
if (delta > usecs) {
break;
}
usecs -= delta;
otick = tick;
}
#if 0
mtx_unlock_spin(&clock_lock);
#endif
}
void
cpu_startprofclock(void)
{
printf("STARTPROFCLOCK\n");
}
void
cpu_stopprofclock(void)
{
}
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