sys/arch/arc/isa/isapnp_machdep.c

   1 /*      $NetBSD: isapnp_machdep.c,v 1.7 2005/12/11 12:16:39 christos 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 1.7 2005/12/11 12:16:39 christos 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 <machine/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 }