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isapnp_machdep.c revision 1.1 
      1 /*	$OpenBSD: isapnp_machdep.c,v 1.1 1997/12/27 12:13:11 niklas Exp $	*/
      2 /*	$NetBSD: isapnp_machdep.c,v 1.1 2000/02/22 11:05:23 soda Exp $	*/
      3 
      4 /*-
      5  * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
      6  * All rights reserved.
      7  *
      8  * This code is derived from software contributed to The NetBSD Foundation
      9  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
     10  * NASA Ames Research Center.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *	This product includes software developed by the NetBSD
     23  *	Foundation, Inc. and its contributors.
     24  * 4. Neither the name of The NetBSD Foundation nor the names of its
     25  *    contributors may be used to endorse or promote products derived
     26  *    from this software without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     29  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     30  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     31  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     32  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     33  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     34  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     35  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     36  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     37  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     38  * POSSIBILITY OF SUCH DAMAGE.
     39  */
     40 
     41 /*
     42  * Copyright (c) 1996 Christos Zoulas.  All rights reserved.
     43  *
     44  * Redistribution and use in source and binary forms, with or without
     45  * modification, are permitted provided that the following conditions
     46  * are met:
     47  * 1. Redistributions of source code must retain the above copyright
     48  *    notice, this list of conditions and the following disclaimer.
     49  * 2. Redistributions in binary form must reproduce the above copyright
     50  *    notice, this list of conditions and the following disclaimer in the
     51  *    documentation and/or other materials provided with the distribution.
     52  * 3. All advertising materials mentioning features or use of this software
     53  *    must display the following acknowledgement:
     54  *	This product includes software developed by Christos Zoulas.
     55  * 4. The name of the author may not be used to endorse or promote products
     56  *    derived from this software without specific prior written permission.
     57  *
     58  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     59  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     60  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     61  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     62  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     63  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     64  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     65  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     66  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     67  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     68  */
     69 
     70 /*
     71  * Machine-dependent portions of ISA PnP bus autoconfiguration.
     72  *
     73  * N.B. This file exists mostly to get around some lameness surrounding
     74  * the PnP spec.  ISA PnP registers live where some `normal' ISA
     75  * devices do, but are e.g. write-only registers where the normal
     76  * device has a read-only register.  This breaks in the presence of
     77  * i/o port accounting.  This file takes care of mapping ISA PnP
     78  * registers without actually allocating them in extent maps.
     79  *
     80  * Since this is a machine-dependent file, we make all sorts of
     81  * assumptions about bus.h's guts.  Beware!
     82  */
     83 
     84 #include <sys/param.h>
     85 #include <sys/systm.h>
     86 #include <sys/device.h>
     87 #include <sys/malloc.h>
     88 
     89 #include <machine/bus.h>
     90 
     91 #include <dev/isa/isapnpreg.h>
     92 
     93 #include <dev/isa/isavar.h>
     94 
     95 /* isapnp_map():
     96  *	Map I/O regions used by PnP
     97  */
     98 int
     99 isapnp_map(sc)
    100 	struct isapnp_softc *sc;
    101 {
    102 	sc->sc_addr_ioh = sc->sc_iot->bus_base + ISAPNP_ADDR;
    103 	sc->sc_wrdata_ioh = sc->sc_iot->bus_base + ISAPNP_WRDATA;
    104 	return (0);
    105 }
    106 
    107 /* isapnp_unmap():
    108  *	Unmap I/O regions used by PnP
    109  */
    110 void
    111 isapnp_unmap(sc)
    112 	struct isapnp_softc *sc;
    113 {
    114 	/* Do nothing. */
    115 }
    116 
    117 /* isapnp_map_readport():
    118  *	Called to map the PnP `read port', which is mapped independently
    119  *	of the `write' and `addr' ports.
    120  *
    121  *	NOTE: assumes the caller has filled in sc->sc_read_port!
    122  */
    123 int
    124 isapnp_map_readport(sc)
    125 	struct isapnp_softc *sc;
    126 {
    127 #ifdef _KERNEL
    128 	int error;
    129 
    130 	/* Check if some other device has already claimed this port. */
    131 	if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
    132 	    &sc->sc_read_ioh)) != 0)
    133 		return error;
    134 
    135 	/*
    136 	 * XXX: We unmap the port because it can and will be used by other
    137 	 *	devices such as a joystick. We need a better port accounting
    138 	 *	scheme with read and write ports.
    139 	 */
    140 	bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
    141 #endif
    142 	return 0;
    143 }
    144 
    145 /* isapnp_unmap_readport():
    146  *	Pretend to unmap a previously mapped `read port'.
    147  */
    148 void
    149 isapnp_unmap_readport(sc)
    150 	struct isapnp_softc *sc;
    151 {
    152 	/* Do nothing */
    153 }
    154