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isapnp_machdep.c revision 1.8.12.1 
      1 /*	$NetBSD: isapnp_machdep.c,v 1.8.12.1 2005/02/12 18:17:34 yamt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996, 1997 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/cdefs.h>
     55 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.8.12.1 2005/02/12 18:17:34 yamt Exp $");
     56 
     57 #include <sys/param.h>
     58 #include <sys/systm.h>
     59 #include <sys/device.h>
     60 #include <sys/malloc.h>
     61 
     62 #include <machine/bus.h>
     63 
     64 #include <dev/isa/isavar.h>
     65 
     66 #include <dev/isapnp/isapnpreg.h>
     67 #include <dev/isapnp/isapnpvar.h>
     68 
     69 /* isapnp_map():
     70  *	Map I/O regions used by PnP
     71  */
     72 int
     73 isapnp_map(struct isapnp_softc *sc)
     74 {
     75 
     76 #ifdef DIAGNOSTIC
     77 	if (sc->sc_iot != X86_BUS_SPACE_IO)
     78 		panic("isapnp_map: bogus bus space tag");
     79 #endif
     80 
     81 	sc->sc_addr_ioh = ISAPNP_ADDR;
     82 	sc->sc_wrdata_ioh = ISAPNP_WRDATA;
     83 	return (0);
     84 }
     85 
     86 /* isapnp_unmap():
     87  *	Unmap I/O regions used by PnP
     88  */
     89 void
     90 isapnp_unmap(struct isapnp_softc *sc)
     91 {
     92 
     93 	/* Do nothing. */
     94 }
     95 
     96 /* isapnp_map_readport():
     97  *	Called to map the PnP `read port', which is mapped independently
     98  *	of the `write' and `addr' ports.
     99  *
    100  *	NOTE: assumes the caller has filled in sc->sc_read_port!
    101  */
    102 int
    103 isapnp_map_readport(struct isapnp_softc *sc)
    104 {
    105 #ifdef _KERNEL
    106 	int error;
    107 #endif
    108 
    109 #ifdef DIAGNOSTIC
    110 	if (sc->sc_iot != X86_BUS_SPACE_IO)
    111 		panic("isapnp_map_readport: bogus bus space tag");
    112 #endif
    113 
    114 #ifdef _KERNEL
    115 	/* Check if some other device has already claimed this port. */
    116 	if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
    117 	    &sc->sc_read_ioh)) != 0)
    118 		return error;
    119 
    120 	/*
    121 	 * XXX: We unmap the port because it can and will be used by other
    122 	 *	devices such as a joystick. We need a better port accounting
    123 	 *	scheme with read and write ports.
    124 	 */
    125 	bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
    126 #endif
    127 	return 0;
    128 }
    129 
    130 /* isapnp_unmap_readport():
    131  *	Pretend to unmap a previously mapped `read port'.
    132  */
    133 void
    134 isapnp_unmap_readport(struct isapnp_softc *sc)
    135 {
    136 
    137 	/* Do nothing */
    138 }
    139