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      1 /*	$NetBSD: isapnp_machdep.c,v 1.18 2023/12/20 15:00:07 thorpej 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 1.18 2023/12/20 15:00:07 thorpej Exp $");
     49 
     50 #include <sys/param.h>
     51 #include <sys/systm.h>
     52 #include <sys/device.h>
     53 
     54 #include <sys/bus.h>
     55 
     56 #include <dev/isa/isavar.h>
     57 
     58 #include <dev/isapnp/isapnpreg.h>
     59 #include <dev/isapnp/isapnpvar.h>
     60 
     61 /* isapnp_map():
     62  *	Map I/O regions used by PnP
     63  */
     64 int
     65 isapnp_map(struct isapnp_softc *sc)
     66 {
     67 
     68 #ifdef DIAGNOSTIC
     69 	if (!bus_space_is_equal(sc->sc_iot, x86_bus_space_io))
     70 		panic("isapnp_map: bogus bus space tag");
     71 #endif
     72 
     73 	sc->sc_addr_ioh = ISAPNP_ADDR;
     74 	sc->sc_wrdata_ioh = ISAPNP_WRDATA;
     75 	return (0);
     76 }
     77 
     78 /* isapnp_unmap():
     79  *	Unmap I/O regions used by PnP
     80  */
     81 void
     82 isapnp_unmap(struct isapnp_softc *sc)
     83 {
     84 
     85 	/* Do nothing. */
     86 }
     87 
     88 /* isapnp_map_readport():
     89  *	Called to map the PnP `read port', which is mapped independently
     90  *	of the `write' and `addr' ports.
     91  *
     92  *	NOTE: assumes the caller has filled in sc->sc_read_port!
     93  */
     94 int
     95 isapnp_map_readport(struct isapnp_softc *sc)
     96 {
     97 #ifdef _KERNEL
     98 	int error;
     99 #endif
    100 
    101 #ifdef DIAGNOSTIC
    102 	if (!bus_space_is_equal(sc->sc_iot, x86_bus_space_io))
    103 		panic("isapnp_map_readport: bogus bus space tag");
    104 #endif
    105 
    106 #ifdef _KERNEL
    107 	/* Check if some other device has already claimed this port. */
    108 	if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
    109 	    &sc->sc_read_ioh)) != 0)
    110 		return error;
    111 
    112 	/*
    113 	 * XXX: We unmap the port because it can and will be used by other
    114 	 *	devices such as a joystick. We need a better port accounting
    115 	 *	scheme with read and write ports.
    116 	 */
    117 	bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
    118 #endif
    119 	return 0;
    120 }
    121 
    122 /* isapnp_unmap_readport():
    123  *	Pretend to unmap a previously mapped `read port'.
    124  */
    125 void
    126 isapnp_unmap_readport(struct isapnp_softc *sc)
    127 {
    128 
    129 	/* Do nothing */
    130 }
    131