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isapnp_machdep.c revision 1.9 
      1 /*	$NetBSD: isapnp_machdep.c,v 1.9 2011/07/01 19:25:41 dyoung 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  *
     22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     32  * POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 
     35 /*
     36  * Machine-dependent portions of ISA PnP bus autoconfiguration.
     37  *
     38  * N.B. This file exists mostly to get around some lameness surrounding
     39  * the PnP spec.  ISA PnP registers live where some `normal' ISA
     40  * devices do, but are e.g. write-only registers where the normal
     41  * device has a read-only register.  This breaks in the presence of
     42  * i/o port accounting.  This file takes care of mapping ISA PnP
     43  * registers without actually allocating them in extent maps.
     44  *
     45  * Since this is a machine-dependent file, we make all sorts of
     46  * assumptions about bus.h's guts.  Beware!
     47  */
     48 
     49 #include <sys/cdefs.h>
     50 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.9 2011/07/01 19:25:41 dyoung Exp $");
     51 
     52 #include <sys/param.h>
     53 #include <sys/systm.h>
     54 #include <sys/device.h>
     55 #include <sys/malloc.h>
     56 
     57 #include <sys/bus.h>
     58 
     59 #include <dev/isa/isavar.h>
     60 
     61 #include <dev/isapnp/isapnpreg.h>
     62 #include <dev/isapnp/isapnpvar.h>
     63 
     64 /* isapnp_map():
     65  *	Map I/O regions used by PnP
     66  */
     67 int
     68 isapnp_map(struct isapnp_softc *sc)
     69 {
     70 	bus_space_tag_t bst;
     71 
     72 	bst = sc->sc_iot;
     73 	sc->sc_addr_ioh = bst->bs_vbase + ISAPNP_ADDR - bst->bs_start;
     74 	sc->sc_wrdata_ioh = bst->bs_vbase + ISAPNP_WRDATA - bst->bs_start;
     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 _KERNEL
    102 	/* Check if some other device has already claimed this port. */
    103 	if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
    104 	    &sc->sc_read_ioh)) != 0)
    105 		return error;
    106 
    107 	/*
    108 	 * XXX: We unmap the port because it can and will be used by other
    109 	 *	devices such as a joystick. We need a better port accounting
    110 	 *	scheme with read and write ports.
    111 	 */
    112 	bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
    113 #endif
    114 	return 0;
    115 }
    116 
    117 /* isapnp_unmap_readport():
    118  *	Pretend to unmap a previously mapped `read port'.
    119  */
    120 void
    121 isapnp_unmap_readport(struct isapnp_softc *sc)
    122 {
    123 
    124 	/* Do nothing. */
    125 }
    126