Annotation of sys/arch/i386/isa/isapnp_machdep.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: isapnp_machdep.c,v 1.3 2006/09/19 11:06:34 jsg Exp $ */
! 2: /* $NetBSD: isapnp_machdep.c,v 1.5 1997/10/04 17:32:30 thorpej Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
! 10: * NASA Ames Research Center.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the NetBSD
! 23: * Foundation, Inc. and its contributors.
! 24: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 25: * contributors may be used to endorse or promote products derived
! 26: * from this software without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 38: * POSSIBILITY OF SUCH DAMAGE.
! 39: */
! 40:
! 41: /*
! 42: * Copyright (c) 1996 Christos Zoulas. All rights reserved.
! 43: *
! 44: * Redistribution and use in source and binary forms, with or without
! 45: * modification, are permitted provided that the following conditions
! 46: * are met:
! 47: * 1. Redistributions of source code must retain the above copyright
! 48: * notice, this list of conditions and the following disclaimer.
! 49: * 2. Redistributions in binary form must reproduce the above copyright
! 50: * notice, this list of conditions and the following disclaimer in the
! 51: * documentation and/or other materials provided with the distribution.
! 52: * 3. All advertising materials mentioning features or use of this software
! 53: * must display the following acknowledgement:
! 54: * This product includes software developed by Christos Zoulas.
! 55: * 4. The name of the author may not be used to endorse or promote products
! 56: * derived from this software without specific prior written permission.
! 57: *
! 58: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 59: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 60: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 61: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 62: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 63: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 64: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 65: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 66: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 67: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 68: */
! 69:
! 70: /*
! 71: * Machine-dependent portions of ISA PnP bus autoconfiguration.
! 72: *
! 73: * N.B. This file exists mostly to get around some lameness surrounding
! 74: * the PnP spec. ISA PnP registers live where some `normal' ISA
! 75: * devices do, but are e.g. write-only registers where the normal
! 76: * device has a read-only register. This breaks in the presence of
! 77: * i/o port accounting. This file takes care of mapping ISA PnP
! 78: * registers without actually allocating them in extent maps.
! 79: *
! 80: * Since this is a machine-dependent file, we make all sorts of
! 81: * assumptions about bus.h's guts. Beware!
! 82: */
! 83:
! 84: #include <sys/param.h>
! 85: #include <sys/systm.h>
! 86: #include <sys/device.h>
! 87: #include <sys/malloc.h>
! 88:
! 89: #include <machine/bus.h>
! 90:
! 91: #include <dev/isa/isapnpreg.h>
! 92:
! 93: #include <dev/isa/isavar.h>
! 94:
! 95: /* isapnp_map():
! 96: * Map I/O regions used by PnP
! 97: */
! 98: int
! 99: isapnp_map(struct isapnp_softc *sc)
! 100: {
! 101:
! 102: #ifdef DIAGNOSTIC
! 103: if (sc->sc_iot != I386_BUS_SPACE_IO)
! 104: panic("isapnp_map: bogus bus space tag");
! 105: #endif
! 106:
! 107: sc->sc_addr_ioh = ISAPNP_ADDR;
! 108: sc->sc_wrdata_ioh = ISAPNP_WRDATA;
! 109: return (0);
! 110: }
! 111:
! 112: /* isapnp_unmap():
! 113: * Unmap I/O regions used by PnP
! 114: */
! 115: void
! 116: isapnp_unmap(struct isapnp_softc *sc)
! 117: {
! 118:
! 119: /* Do nothing. */
! 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 DIAGNOSTIC
! 136: if (sc->sc_iot != I386_BUS_SPACE_IO)
! 137: panic("isapnp_map_readport: bogus bus space tag");
! 138: #endif
! 139:
! 140: #ifdef _KERNEL
! 141: /* Check if some other device has already claimed this port. */
! 142: if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
! 143: &sc->sc_read_ioh)) != 0)
! 144: return error;
! 145:
! 146: /*
! 147: * XXX: We unmap the port because it can and will be used by other
! 148: * devices such as a joystick. We need a better port accounting
! 149: * scheme with read and write ports.
! 150: */
! 151: bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
! 152: #endif
! 153: return 0;
! 154: }
! 155:
! 156: /* isapnp_unmap_readport():
! 157: * Pretend to unmap a previously mapped `read port'.
! 158: */
! 159: void
! 160: isapnp_unmap_readport(struct isapnp_softc *sc)
! 161: {
! 162:
! 163: /* Do nothing */
! 164: }
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