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File: [cvs.NetBSD.org] / src / sys / arch / i386 / isa / isapnp_machdep.c (download)

Revision 1.6, Sat Sep 5 15:28:07 1998 UTC (25 years, 6 months ago) by christos
Branch: MAIN
CVS Tags: wrstuden-devbsize-base, wrstuden-devbsize-19991221, wrstuden-devbsize, thorpej_scsipi_nbase, thorpej_scsipi_beforemerge, thorpej_scsipi_base, thorpej_scsipi, thorpej-mips-cache-base, thorpej-mips-cache, thorpej-devvp-base3, thorpej-devvp-base2, thorpej-devvp-base, thorpej-devvp, sommerfeld_i386mpbase_20000422, sommerfeld_i386mp_houseclean, pre-chs-ubcperf, post-chs-ubcperf, netbsd-1-5-base, netbsd-1-5-RELEASE, netbsd-1-5-PATCH003, netbsd-1-5-PATCH002, netbsd-1-5-PATCH001, netbsd-1-5-BETA2, netbsd-1-5-BETA, netbsd-1-5-ALPHA2, netbsd-1-5, netbsd-1-4-base, netbsd-1-4-RELEASE, netbsd-1-4-PATCH003, netbsd-1-4-PATCH002, netbsd-1-4-PATCH001, netbsd-1-4, minoura-xpg4dl-base, minoura-xpg4dl, kenh-if-detach-base, kenh-if-detach, kame_14_19990705, kame_14_19990628, kame_141_19991130, kame, fvdl-softdep-base, fvdl-softdep, comdex-fall-1999-base, comdex-fall-1999, chs-ubc2-newbase, chs-ubc2-base, chs-ubc2, chs-ubc-base, chs-ubc
Branch point for: nathanw_sa, kqueue
Changes since 1.5: +2 -31 lines

Assign copyright to TNF.

/*	$NetBSD: isapnp_machdep.c,v 1.6 1998/09/05 15:28:07 christos Exp $	*/

/*-
 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center and by Christos Zoulas.
 *
 * 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.
 */

/*
 * Machine-dependent portions of ISA PnP bus autoconfiguration.
 *
 * N.B. This file exists mostly to get around some lameness surrounding
 * the PnP spec.  ISA PnP registers live where some `normal' ISA
 * devices do, but are e.g. write-only registers where the normal
 * device has a read-only register.  This breaks in the presence of
 * i/o port accounting.  This file takes care of mapping ISA PnP
 * registers without actually allocating them in extent maps.
 *
 * Since this is a machine-dependent file, we make all sorts of
 * assumptions about bus.h's guts.  Beware!
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>

#include <machine/bus.h>

#include <dev/isa/isavar.h>

#include <dev/isapnp/isapnpreg.h>
#include <dev/isapnp/isapnpvar.h>

/* isapnp_map():
 *	Map I/O regions used by PnP
 */
int
isapnp_map(sc)
	struct isapnp_softc *sc;
{

#ifdef DIAGNOSTIC
	if (sc->sc_iot != I386_BUS_SPACE_IO)
		panic("isapnp_map: bogus bus space tag");
#endif

	sc->sc_addr_ioh = ISAPNP_ADDR;
	sc->sc_wrdata_ioh = ISAPNP_WRDATA;
	return (0);
}

/* isapnp_unmap():
 *	Unmap I/O regions used by PnP
 */
void
isapnp_unmap(sc)
	struct isapnp_softc *sc;
{

	/* Do nothing. */
}

/* isapnp_map_readport():
 *	Called to map the PnP `read port', which is mapped independently
 *	of the `write' and `addr' ports.
 *
 *	NOTE: assumes the caller has filled in sc->sc_read_port!
 */
int
isapnp_map_readport(sc)
	struct isapnp_softc *sc;
{
#ifdef _KERNEL
	int error;
#endif

#ifdef DIAGNOSTIC
	if (sc->sc_iot != I386_BUS_SPACE_IO)
		panic("isapnp_map_readport: bogus bus space tag");
#endif

#ifdef _KERNEL
	/* Check if some other device has already claimed this port. */
	if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
	    &sc->sc_read_ioh)) != 0)
		return error;

	/*
	 * XXX: We unmap the port because it can and will be used by other
	 *	devices such as a joystick. We need a better port accounting
	 *	scheme with read and write ports.
	 */
	bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
#endif
	return 0;
}

/* isapnp_unmap_readport():
 *	Pretend to unmap a previously mapped `read port'.
 */
void
isapnp_unmap_readport(sc)
	struct isapnp_softc *sc;
{

	/* Do nothing */
}