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isapnp_machdep.c revision 1.12.56.1 
      1 /*	$NetBSD: isapnp_machdep.c,v 1.12.56.1 2008/05/16 02:22:37 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  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * Machine-dependent portions of ISA PnP bus autoconfiguration.
     35  *
     36  * N.B. This file exists mostly to get around some lameness surrounding
     37  * the PnP spec.  ISA PnP registers live where some `normal' ISA
     38  * devices do, but are e.g. write-only registers where the normal
     39  * device has a read-only register.  This breaks in the presence of
     40  * i/o port accounting.  This file takes care of mapping ISA PnP
     41  * registers without actually allocating them in extent maps.
     42  *
     43  * Since this is a machine-dependent file, we make all sorts of
     44  * assumptions about bus.h's guts.  Beware!
     45  */
     46 
     47 #include <sys/cdefs.h>
     48 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.12.56.1 2008/05/16 02:22:37 yamt Exp $");
     49 
     50 #include <sys/param.h>
     51 #include <sys/systm.h>
     52 #include <sys/device.h>
     53 #include <sys/malloc.h>
     54 
     55 #include <machine/bus.h>
     56 
     57 #include <dev/isa/isavar.h>
     58 
     59 #include <dev/isapnp/isapnpreg.h>
     60 #include <dev/isapnp/isapnpvar.h>
     61 
     62 /* isapnp_map():
     63  *	Map I/O regions used by PnP
     64  */
     65 int
     66 isapnp_map(struct isapnp_softc *sc)
     67 {
     68 
     69 #ifdef DIAGNOSTIC
     70 	if (sc->sc_iot != X86_BUS_SPACE_IO)
     71 		panic("isapnp_map: bogus bus space tag");
     72 #endif
     73 
     74 	sc->sc_addr_ioh = ISAPNP_ADDR;
     75 	sc->sc_wrdata_ioh = ISAPNP_WRDATA;
     76 	return (0);
     77 }
     78 
     79 /* isapnp_unmap():
     80  *	Unmap I/O regions used by PnP
     81  */
     82 void
     83 isapnp_unmap(struct isapnp_softc *sc)
     84 {
     85 
     86 	/* Do nothing. */
     87 }
     88 
     89 /* isapnp_map_readport():
     90  *	Called to map the PnP `read port', which is mapped independently
     91  *	of the `write' and `addr' ports.
     92  *
     93  *	NOTE: assumes the caller has filled in sc->sc_read_port!
     94  */
     95 int
     96 isapnp_map_readport(struct isapnp_softc *sc)
     97 {
     98 #ifdef _KERNEL
     99 	int error;
    100 #endif
    101 
    102 #ifdef DIAGNOSTIC
    103 	if (sc->sc_iot != X86_BUS_SPACE_IO)
    104 		panic("isapnp_map_readport: bogus bus space tag");
    105 #endif
    106 
    107 #ifdef _KERNEL
    108 	/* Check if some other device has already claimed this port. */
    109 	if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
    110 	    &sc->sc_read_ioh)) != 0)
    111 		return error;
    112 
    113 	/*
    114 	 * XXX: We unmap the port because it can and will be used by other
    115 	 *	devices such as a joystick. We need a better port accounting
    116 	 *	scheme with read and write ports.
    117 	 */
    118 	bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
    119 #endif
    120 	return 0;
    121 }
    122 
    123 /* isapnp_unmap_readport():
    124  *	Pretend to unmap a previously mapped `read port'.
    125  */
    126 void
    127 isapnp_unmap_readport(struct isapnp_softc *sc)
    128 {
    129 
    130 	/* Do nothing */
    131 }
    132