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isapnp_machdep.c revision 1.3 
      1 /*	$NetBSD: isapnp_machdep.c,v 1.3 1998/09/05 15:28:04 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
      9  * NASA Ames Research Center and by Christos Zoulas.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the NetBSD
     22  *	Foundation, Inc. and its contributors.
     23  * 4. Neither the name of The NetBSD Foundation nor the names of its
     24  *    contributors may be used to endorse or promote products derived
     25  *    from this software without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     37  * POSSIBILITY OF SUCH DAMAGE.
     38  */
     39 
     40 /*
     41  * Machine-dependent portions of ISA PnP bus autoconfiguration.
     42  *
     43  * N.B. This file exists mostly to get around some lameness surrounding
     44  * the PnP spec.  ISA PnP registers live where some `normal' ISA
     45  * devices do, but are e.g. write-only registers where the normal
     46  * device has a read-only register.  This breaks in the presence of
     47  * i/o port accounting.  This file takes care of mapping ISA PnP
     48  * registers without actually allocating them in extent maps.
     49  *
     50  * Since this is a machine-dependent file, we make all sorts of
     51  * assumptions about bus.h's guts.  Beware!
     52  */
     53 
     54 #include <sys/param.h>
     55 #include <sys/systm.h>
     56 #include <sys/device.h>
     57 #include <sys/malloc.h>
     58 
     59 #include <machine/bus.h>
     60 
     61 #include <dev/isa/isavar.h>
     62 
     63 #include <dev/isapnp/isapnpreg.h>
     64 #include <dev/isapnp/isapnpvar.h>
     65 
     66 /* isapnp_map():
     67  *	Map I/O regions used by PnP
     68  */
     69 int
     70 isapnp_map(sc)
     71 	struct isapnp_softc *sc;
     72 {
     73 	int error;
     74 
     75 	error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_ADDR, 1, 0,
     76 	    &sc->sc_addr_ioh);
     77 	if (error)
     78 		return (error);
     79 
     80 	error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_WRDATA, 1, 0,
     81 	    &sc->sc_wrdata_ioh);
     82 	if (error) {
     83 		alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1);
     84 		return (error);
     85 	}
     86 
     87 	return (0);
     88 }
     89 
     90 /* isapnp_unmap():
     91  *	Unmap I/O regions used by PnP
     92  */
     93 void
     94 isapnp_unmap(sc)
     95 	struct isapnp_softc *sc;
     96 {
     97 
     98 	alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1);
     99 	alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_wrdata_ioh, 1);
    100 }
    101 
    102 /* isapnp_map_readport():
    103  *	Called to map the PnP `read port', which is mapped independently
    104  *	of the `write' and `addr' ports.
    105  *
    106  *	NOTE: assumes the caller has filled in sc->sc_read_port!
    107  */
    108 int
    109 isapnp_map_readport(sc)
    110 	struct isapnp_softc *sc;
    111 {
    112 #ifdef _KERNEL
    113 	int error;
    114 #endif
    115 
    116 #ifdef _KERNEL
    117 	/* Check if some other device has already claimed this port. */
    118 	if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
    119 	    &sc->sc_read_ioh)) != 0)
    120 		return error;
    121 
    122 	/*
    123 	 * XXX: We unmap the port because it can and will be used by other
    124 	 *	devices such as a joystick. We need a better port accounting
    125 	 *	scheme with read and write ports.
    126 	 */
    127 	bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
    128 #endif
    129 	return 0;
    130 }
    131 
    132 /* isapnp_unmap_readport():
    133  *	Pretend to unmap a previously mapped `read port'.
    134  */
    135 void
    136 isapnp_unmap_readport(sc)
    137 	struct isapnp_softc *sc;
    138 {
    139 
    140 	/* Do nothing */
    141 }
    142