143 lines
4.3 KiB
C
143 lines
4.3 KiB
C
/* $NetBSD: isapnp_machdep.c,v 1.8 2003/02/26 22:23:03 fvdl Exp $ */
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/*-
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* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
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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 Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center and by Christos Zoulas.
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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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/*
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* Machine-dependent portions of ISA PnP bus autoconfiguration.
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*
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* N.B. This file exists mostly to get around some lameness surrounding
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* the PnP spec. ISA PnP registers live where some `normal' ISA
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* devices do, but are e.g. write-only registers where the normal
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* device has a read-only register. This breaks in the presence of
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* i/o port accounting. This file takes care of mapping ISA PnP
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* registers without actually allocating them in extent maps.
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*
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* Since this is a machine-dependent file, we make all sorts of
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* assumptions about bus.h's guts. Beware!
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.8 2003/02/26 22:23:03 fvdl Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <machine/bus.h>
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#include <dev/isa/isavar.h>
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#include <dev/isapnp/isapnpreg.h>
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#include <dev/isapnp/isapnpvar.h>
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/* isapnp_map():
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* Map I/O regions used by PnP
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*/
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int
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isapnp_map(sc)
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struct isapnp_softc *sc;
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{
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#ifdef DIAGNOSTIC
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if (sc->sc_iot != X86_BUS_SPACE_IO)
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panic("isapnp_map: bogus bus space tag");
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#endif
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sc->sc_addr_ioh = ISAPNP_ADDR;
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sc->sc_wrdata_ioh = ISAPNP_WRDATA;
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return (0);
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}
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/* isapnp_unmap():
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* Unmap I/O regions used by PnP
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*/
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void
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isapnp_unmap(sc)
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struct isapnp_softc *sc;
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{
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/* Do nothing. */
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}
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/* isapnp_map_readport():
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* Called to map the PnP `read port', which is mapped independently
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* of the `write' and `addr' ports.
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*
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* NOTE: assumes the caller has filled in sc->sc_read_port!
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*/
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int
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isapnp_map_readport(sc)
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struct isapnp_softc *sc;
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{
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#ifdef _KERNEL
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int error;
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#endif
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#ifdef DIAGNOSTIC
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if (sc->sc_iot != X86_BUS_SPACE_IO)
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panic("isapnp_map_readport: bogus bus space tag");
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#endif
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#ifdef _KERNEL
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/* Check if some other device has already claimed this port. */
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if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
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&sc->sc_read_ioh)) != 0)
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return error;
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/*
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* XXX: We unmap the port because it can and will be used by other
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* devices such as a joystick. We need a better port accounting
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* scheme with read and write ports.
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*/
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bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
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#endif
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return 0;
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}
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/* isapnp_unmap_readport():
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* Pretend to unmap a previously mapped `read port'.
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*/
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void
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isapnp_unmap_readport(sc)
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struct isapnp_softc *sc;
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{
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/* Do nothing */
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}
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