sys/arch/alpha/isa/isapnp_machdep.c

   1 /*      $NetBSD: isapnp_machdep.c,v 1.6 2008/04/28 20:23:11 martin 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 1.6 2008/04/28 20:23:11 martin 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         int error;
  69
  70         error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_ADDR, 1, 0,
  71             &sc->sc_addr_ioh);
  72         if (error)
  73                 return (error);
  74
  75         error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_WRDATA, 1, 0,
  76             &sc->sc_wrdata_ioh);
  77         if (error) {
  78                 alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1);
  79                 return (error);
  80         }
  81
  82         return (0);
  83 }
  84
  85 /* isapnp_unmap():
  86  *      Unmap I/O regions used by PnP
  87  */
  88 void
  89 isapnp_unmap(struct isapnp_softc *sc)
  90 {
  91
  92         alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1);
  93         alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_wrdata_ioh, 1);
  94 }
  95
  96 /* isapnp_map_readport():
  97  *      Called to map the PnP `read port', which is mapped independently
  98  *      of the `write' and `addr' ports.
  99  *
 100  *      NOTE: assumes the caller has filled in sc->sc_read_port!
 101  */
 102 int
 103 isapnp_map_readport(struct isapnp_softc *sc)
 104 {
 105 #ifdef _KERNEL
 106         int error;
 107 #endif
 108
 109 #ifdef _KERNEL
 110         /* Check if some other device has already claimed this port. */
 111         if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
 112             &sc->sc_read_ioh)) != 0)
 113                 return error;
 114
 115         /*
 116          * XXX: We unmap the port because it can and will be used by other
 117          *      devices such as a joystick. We need a better port accounting
 118          *      scheme with read and write ports.
 119          */
 120         bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
 121 #endif
 122         return 0;
 123 }
 124
 125 /* isapnp_unmap_readport():
 126  *      Pretend to unmap a previously mapped `read port'.
 127  */
 128 void
 129 isapnp_unmap_readport(struct isapnp_softc *sc)
 130 {
 131
 132         /* Do nothing */
 133 }