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/*-
* Copyright (c) 2002 by Thomas Moestl <tmm@FreeBSD.org>.
* 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 THE AUTHOR ``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 AUTHOR 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/bus.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/timetc.h>
#include <machine/bus.h>
#include <machine/bus_common.h>
#define COUNTER_MASK ((1 << 29) - 1)
#define COUNTER_FREQ 1000000
#define COUNTER_QUALITY 100
/* Bits in the limit register. */
#define CTLR_INTEN (1U << 31) /* Enable timer interrupts */
#define CTLR_RELOAD (1U << 30) /* Zero counter on write to limit reg */
#define CTLR_PERIODIC (1U << 29) /* Wrap to 0 if limit is reached */
/* Offsets of the registers for the two counters. */
#define CTR_CT0 0x00
#define CTR_CT1 0x10
/* Register offsets from the base address. */
#define CTR_COUNT 0x00
#define CTR_LIMIT 0x08
static timecounter_get_t counter_get_timecount;
struct ct_softc {
bus_space_tag_t sc_tag;
bus_space_handle_t sc_handle;
bus_addr_t sc_offset;
};
/*
* This is called from the psycho and sbus drivers. It does not directly
* attach to the nexus because it shares register space with the bridge in
* question.
*/
void
sparc64_counter_init(const char *name, bus_space_tag_t tag,
bus_space_handle_t handle, bus_addr_t offset)
{
struct timecounter *tc;
struct ct_softc *sc;
printf("initializing counter-timer\n");
/*
* Turn off interrupts from both counters. Set the limit to the
* maximum value (although that should not change anything with
* CTLR_INTEN and CTLR_PERIODIC off).
*/
bus_space_write_8(tag, handle, offset + CTR_CT0 + CTR_LIMIT,
COUNTER_MASK);
bus_space_write_8(tag, handle, offset + CTR_CT1 + CTR_LIMIT,
COUNTER_MASK);
/* Register as a time counter. */
tc = malloc(sizeof(*tc), M_DEVBUF, M_WAITOK | M_ZERO);
sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK);
sc->sc_tag = tag;
sc->sc_handle = handle;
sc->sc_offset = offset + CTR_CT0;
tc->tc_get_timecount = counter_get_timecount;
tc->tc_counter_mask = COUNTER_MASK;
tc->tc_frequency = COUNTER_FREQ;
tc->tc_name = strdup(name, M_DEVBUF);
tc->tc_priv = sc;
tc->tc_quality = COUNTER_QUALITY;
tc_init(tc);
}
static unsigned int
counter_get_timecount(struct timecounter *tc)
{
struct ct_softc *sc;
sc = tc->tc_priv;
return (bus_space_read_8(sc->sc_tag, sc->sc_handle, sc->sc_offset));
}
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