sys/arch/powerpc/isa/isapnp_machdep.c

   1 /*      $NetBSD: isapnp_machdep.c,v 1.3 2008/04/28 20:23:32 martin 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  * Copyright (c) 1997 Thomas Gerner.  All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  46  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  47  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  48  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  49  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  50  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  51  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  52  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  53  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  54  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  55  */
  56
  57 /*
  58  * Machine-dependent portions of ISA PnP bus autoconfiguration.
  59  *
  60  * N.B. This file exists mostly to get around some lameness surrounding
  61  * the PnP spec.  ISA PnP registers live where some `normal' ISA
  62  * devices do, but are e.g. write-only registers where the normal
  63  * device has a read-only register.  This breaks in the presence of
  64  * i/o port accounting.  This file takes care of mapping ISA PnP
  65  * registers without actually allocating them in extent maps.
  66  *
  67  * Since this is a machine-dependent file, we make all sorts of
  68  * assumptions about bus.h's guts.  Beware!
  69  *
  70  * Note: We just use bus_space{,un}map() here.  This works because we
  71  * don't do space accounting (we'd need a back-door to bypass it
  72  * if we did!).
  73  */
  74
  75 #include <sys/cdefs.h>
  76 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.3 2008/04/28 20:23:32 martin Exp $");
  77
  78 #include <sys/param.h>
  79 #include <sys/systm.h>
  80 #include <sys/device.h>
  81 #include <sys/malloc.h>
  82
  83 #include <machine/bus.h>
  84
  85 #include <dev/isa/isavar.h>
  86
  87 #include <dev/isapnp/isapnpreg.h>
  88 #include <dev/isapnp/isapnpvar.h>
  89
  90 /* isapnp_map():
  91  *      Map I/O regions used by PnP
  92  */
  93 int
  94 isapnp_map(struct isapnp_softc *sc)
  95 {
  96 #ifdef _KERNEL
  97         int error;
  98 #endif
  99
 100 #ifdef _KERNEL
 101         if ((error = bus_space_map(sc->sc_iot, ISAPNP_ADDR, 1, 0,
 102              &sc->sc_addr_ioh)) != 0)
 103                 return error;
 104         if ((error = bus_space_map(sc->sc_iot, ISAPNP_WRDATA, 1, 0,
 105              &sc->sc_wrdata_ioh)) != 0)
 106                 return error;
 107 #endif
 108         return (0);
 109 }
 110
 111 /* isapnp_unmap():
 112  *      Unmap I/O regions used by PnP
 113  */
 114 void
 115 isapnp_unmap(struct isapnp_softc *sc)
 116 {
 117
 118         bus_space_unmap(sc->sc_iot, sc->sc_addr_ioh, 1);
 119         bus_space_unmap(sc->sc_iot, sc->sc_wrdata_ioh, 1);
 120 }
 121
 122 /* isapnp_map_readport():
 123  *      Called to map the PnP `read port', which is mapped independently
 124  *      of the `write' and `addr' ports.
 125  *
 126  *      NOTE: assumes the caller has filled in sc->sc_read_port!
 127  */
 128 int
 129 isapnp_map_readport(struct isapnp_softc *sc)
 130 {
 131 #ifdef _KERNEL
 132         int error;
 133 #endif
 134
 135 #ifdef _KERNEL
 136         /* Check if some other device has already claimed this port. */
 137         if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
 138             &sc->sc_read_ioh)) != 0)
 139                 return error;
 140 #endif
 141         return 0;
 142 }
 143
 144 /* isapnp_unmap_readport():
 145  *      Pretend to unmap a previously mapped `read port'.
 146  */
 147 void
 148 isapnp_unmap_readport(struct isapnp_softc *sc)
 149 {
 150
 151         bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
 152 }