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isapnp_machdep.c revision 1.5 
      1 /*	$NetBSD: isapnp_machdep.c,v 1.5 2003/06/14 07:58:16 tsutsui Exp $	*/
      2 /*	$OpenBSD: isapnp_machdep.c,v 1.1 1997/12/27 12:13:11 niklas Exp $	*/
      3 /*	NetBSD: isapnp_machdep.c,v 1.5 1997/10/04 17:32:30 thorpej Exp 	*/
      4 
      5 /*-
      6  * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
      7  * All rights reserved.
      8  *
      9  * This code is derived from software contributed to The NetBSD Foundation
     10  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
     11  * NASA Ames Research Center and by Christos Zoulas.
     12  *
     13  * Redistribution and use in source and binary forms, with or without
     14  * modification, are permitted provided that the following conditions
     15  * are met:
     16  * 1. Redistributions of source code must retain the above copyright
     17  *    notice, this list of conditions and the following disclaimer.
     18  * 2. Redistributions in binary form must reproduce the above copyright
     19  *    notice, this list of conditions and the following disclaimer in the
     20  *    documentation and/or other materials provided with the distribution.
     21  * 3. All advertising materials mentioning features or use of this software
     22  *    must display the following acknowledgement:
     23  *	This product includes software developed by the NetBSD
     24  *	Foundation, Inc. and its contributors.
     25  * 4. Neither the name of The NetBSD Foundation nor the names of its
     26  *    contributors may be used to endorse or promote products derived
     27  *    from this software without specific prior written permission.
     28  *
     29  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     30  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     31  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     32  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     33  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     34  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     35  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     36  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     37  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     39  * POSSIBILITY OF SUCH DAMAGE.
     40  */
     41 
     42 /*
     43  * Machine-dependent portions of ISA PnP bus autoconfiguration.
     44  *
     45  * N.B. This file exists mostly to get around some lameness surrounding
     46  * the PnP spec.  ISA PnP registers live where some `normal' ISA
     47  * devices do, but are e.g. write-only registers where the normal
     48  * device has a read-only register.  This breaks in the presence of
     49  * i/o port accounting.  This file takes care of mapping ISA PnP
     50  * registers without actually allocating them in extent maps.
     51  *
     52  * Since this is a machine-dependent file, we make all sorts of
     53  * assumptions about bus.h's guts.  Beware!
     54  */
     55 
     56 #include <sys/cdefs.h>
     57 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.5 2003/06/14 07:58:16 tsutsui Exp $");
     58 
     59 #include <sys/param.h>
     60 #include <sys/systm.h>
     61 #include <sys/device.h>
     62 #include <sys/malloc.h>
     63 
     64 #include <machine/bus.h>
     65 
     66 #include <dev/isa/isavar.h>
     67 
     68 #include <dev/isapnp/isapnpreg.h>
     69 #include <dev/isapnp/isapnpvar.h>
     70 
     71 /* isapnp_map():
     72  *	Map I/O regions used by PnP
     73  */
     74 int
     75 isapnp_map(sc)
     76 	struct isapnp_softc *sc;
     77 {
     78 	bus_space_tag_t bst;
     79 
     80 	bst = sc->sc_iot;
     81 	sc->sc_addr_ioh = bst->bs_vbase + ISAPNP_ADDR - bst->bs_start;
     82 	sc->sc_wrdata_ioh = bst->bs_vbase + ISAPNP_WRDATA - bst->bs_start;
     83 	return 0;
     84 }
     85 
     86 /* isapnp_unmap():
     87  *	Unmap I/O regions used by PnP
     88  */
     89 void
     90 isapnp_unmap(sc)
     91 	struct isapnp_softc *sc;
     92 {
     93 
     94 	/* Do nothing. */
     95 }
     96 
     97 /* isapnp_map_readport():
     98  *	Called to map the PnP `read port', which is mapped independently
     99  *	of the `write' and `addr' ports.
    100  *
    101  *	NOTE: assumes the caller has filled in sc->sc_read_port!
    102  */
    103 int
    104 isapnp_map_readport(sc)
    105 	struct isapnp_softc *sc;
    106 {
    107 #ifdef _KERNEL
    108 	int error;
    109 #endif
    110 
    111 #ifdef _KERNEL
    112 	/* Check if some other device has already claimed this port. */
    113 	if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
    114 	    &sc->sc_read_ioh)) != 0)
    115 		return error;
    116 
    117 	/*
    118 	 * XXX: We unmap the port because it can and will be used by other
    119 	 *	devices such as a joystick. We need a better port accounting
    120 	 *	scheme with read and write ports.
    121 	 */
    122 	bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
    123 #endif
    124 	return 0;
    125 }
    126 
    127 /* isapnp_unmap_readport():
    128  *	Pretend to unmap a previously mapped `read port'.
    129  */
    130 void
    131 isapnp_unmap_readport(sc)
    132 	struct isapnp_softc *sc;
    133 {
    134 
    135 	/* Do nothing. */
    136 }
    137