text: /*	$NetBSD: isapnp_machdep.c,v 1.3 1998/09/05 15:28:04 christos Exp $	*/
  
  /*-
   * Copyright (c) 1996, 1997, 1998 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;
  {
  	int error;
  
  	error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_ADDR, 1, 0,
  	    &sc->sc_addr_ioh);
  	if (error)
  		return (error);
  
  	error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_WRDATA, 1, 0,
  	    &sc->sc_wrdata_ioh);
  	if (error) {
  		alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1);
  		return (error);
  	}
  
  	return (0);
  }
  
  /* isapnp_unmap():
   *	Unmap I/O regions used by PnP
   */
  void
  isapnp_unmap(sc)
  	struct isapnp_softc *sc;
  {
  
  	alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1);
  	alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_wrdata_ioh, 1);
  }
  
  /* 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 _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 */
  }
  