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      1 /*	$NetBSD: isapnp_machdep.c,v 1.9 2021/07/04 22:42:35 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996, 1997, 1998 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 1.9 2021/07/04 22:42:35 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 	int error;
     68 
     69 	error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_ADDR, 1, 0,
     70 	    &sc->sc_addr_ioh);
     71 	if (error)
     72 		return (error);
     73 
     74 	error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_WRDATA, 1, 0,
     75 	    &sc->sc_wrdata_ioh);
     76 	if (error) {
     77 		alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1);
     78 		return (error);
     79 	}
     80 
     81 	return (0);
     82 }
     83 
     84 /* isapnp_unmap():
     85  *	Unmap I/O regions used by PnP
     86  */
     87 void
     88 isapnp_unmap(struct isapnp_softc *sc)
     89 {
     90 
     91 	alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1);
     92 	alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_wrdata_ioh, 1);
     93 }
     94 
     95 /* isapnp_map_readport():
     96  *	Called to map the PnP `read port', which is mapped independently
     97  *	of the `write' and `addr' ports.
     98  *
     99  *	NOTE: assumes the caller has filled in sc->sc_read_port!
    100  */
    101 int
    102 isapnp_map_readport(struct isapnp_softc *sc)
    103 {
    104 #ifdef _KERNEL
    105 	int error;
    106 #endif
    107 
    108 #ifdef _KERNEL
    109 	/* Check if some other device has already claimed this port. */
    110 	if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
    111 	    &sc->sc_read_ioh)) != 0)
    112 		return error;
    113 
    114 	/*
    115 	 * XXX: We unmap the port because it can and will be used by other
    116 	 *	devices such as a joystick. We need a better port accounting
    117 	 *	scheme with read and write ports.
    118 	 */
    119 	bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
    120 #endif
    121 	return 0;
    122 }
    123 
    124 /* isapnp_unmap_readport():
    125  *	Pretend to unmap a previously mapped `read port'.
    126  */
    127 void
    128 isapnp_unmap_readport(struct isapnp_softc *sc)
    129 {
    130 
    131 	/* Do nothing */
    132 }
    133