117 lines
3.7 KiB
C
117 lines
3.7 KiB
C
/* $NetBSD: latches.c,v 1.4 2002/10/02 03:25:47 thorpej Exp $ */
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/*-
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* Copyright (c) 2001 Ben Harris
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* All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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__KERNEL_RCSID(0, "$NetBSD: latches.c,v 1.4 2002/10/02 03:25:47 thorpej Exp $");
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#include <sys/device.h>
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#include <sys/systm.h>
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#include <machine/bus.h>
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#include <arch/acorn26/iobus/iocvar.h>
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#include <arch/acorn26/ioc/latchreg.h>
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#include <arch/acorn26/ioc/latchvar.h>
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#include <arch/acorn26/ioc/ioebvar.h>
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#include "ioeb.h"
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struct latches_softc {
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struct device sc_dev;
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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_int8_t sc_latcha;
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u_int8_t sc_latchb;
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};
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static int latches_match(struct device *, struct cfdata *, void *);
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static void latches_attach(struct device *, struct device *, void *);
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CFATTACH_DECL(latches, sizeof(struct latches_softc),
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latches_match, latches_attach, NULL, NULL);
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struct device *the_latches;
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static int
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latches_match(struct device *parent, struct cfdata *cf, void *aux)
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{
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/*
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* Latches are write-only, so we can't probe for them.
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* Happily, the set of machines they exist on is precisely the
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* set that doesn't have IOEBs, so...
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*/
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#if NIOEB > 0
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if (the_ioeb != NULL)
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return 0;
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#endif
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return 1;
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}
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static void
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latches_attach(struct device *parent, struct device *self, void *aux)
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{
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struct latches_softc *sc = (void *)self;
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struct ioc_attach_args *ioc = aux;
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bus_space_tag_t iot;
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bus_space_handle_t ioh;
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if (the_latches == NULL)
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the_latches = self;
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iot = sc->sc_iot = ioc->ioc_fast_t;
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ioh = sc->sc_ioh = ioc->ioc_fast_h;
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sc->sc_latcha =
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LATCHA_NSEL0 | LATCHA_NSEL1 | LATCHA_NSEL2 | LATCHA_NSEL3 |
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LATCHA_NSIDE1 | LATCHA_NMOTORON | LATCHA_NINUSE;
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sc->sc_latchb = LATCHB_NFDCR | LATCHB_NPSTB;
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bus_space_write_1(sc->sc_iot, sc->sc_ioh, LATCH_A, sc->sc_latcha);
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bus_space_write_1(sc->sc_iot, sc->sc_ioh, LATCH_B, sc->sc_latchb);
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printf("\n");
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}
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void
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latcha_update(u_int8_t mask, u_int8_t value)
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{
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struct latches_softc *sc = (void *)the_latches;
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sc->sc_latcha = (sc->sc_latcha & ~mask) | value;
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bus_space_write_1(sc->sc_iot, sc->sc_ioh, LATCH_A, sc->sc_latcha);
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}
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void
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latchb_update(u_int8_t mask, u_int8_t value)
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{
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struct latches_softc *sc = (void *)the_latches;
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sc->sc_latchb = (sc->sc_latchb & ~mask) | value;
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bus_space_write_1(sc->sc_iot, sc->sc_ioh, LATCH_B, sc->sc_latcha);
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}
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