Annotation of sys/arch/alpha/isa/isapnp_machdep.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: isapnp_machdep.c,v 1.3 2002/12/10 23:32:01 miod Exp $ */
! 2: /* $NetBSD: isapnp_machdep.c,v 1.3 1998/09/05 15:28:04 christos Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1996, 1997, 1998 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 and by Christos Zoulas.
! 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: * Machine-dependent portions of ISA PnP bus autoconfiguration.
! 43: *
! 44: * N.B. This file exists mostly to get around some lameness surrounding
! 45: * the PnP spec. ISA PnP registers live where some `normal' ISA
! 46: * devices do, but are e.g. write-only registers where the normal
! 47: * device has a read-only register. This breaks in the presence of
! 48: * i/o port accounting. This file takes care of mapping ISA PnP
! 49: * registers without actually allocating them in extent maps.
! 50: *
! 51: * Since this is a machine-dependent file, we make all sorts of
! 52: * assumptions about bus.h's guts. Beware!
! 53: */
! 54:
! 55: #include <sys/param.h>
! 56: #include <sys/systm.h>
! 57: #include <sys/device.h>
! 58: #include <sys/malloc.h>
! 59:
! 60: #include <machine/bus.h>
! 61:
! 62: #include <dev/isa/isavar.h>
! 63:
! 64: #include <dev/isa/isapnpreg.h>
! 65: /* #include <dev/isapnp/isapnpvar.h> */
! 66:
! 67: /* isapnp_map():
! 68: * Map I/O regions used by PnP
! 69: */
! 70: int
! 71: isapnp_map(sc)
! 72: struct isapnp_softc *sc;
! 73: {
! 74: int error;
! 75:
! 76: error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_ADDR, 1, 0,
! 77: &sc->sc_addr_ioh);
! 78: if (error)
! 79: return (error);
! 80:
! 81: error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_WRDATA, 1, 0,
! 82: &sc->sc_wrdata_ioh);
! 83: if (error) {
! 84: alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1);
! 85: return (error);
! 86: }
! 87:
! 88: return (0);
! 89: }
! 90:
! 91: /* isapnp_unmap():
! 92: * Unmap I/O regions used by PnP
! 93: */
! 94: void
! 95: isapnp_unmap(sc)
! 96: struct isapnp_softc *sc;
! 97: {
! 98:
! 99: alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1);
! 100: alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_wrdata_ioh, 1);
! 101: }
! 102:
! 103: /* isapnp_map_readport():
! 104: * Called to map the PnP `read port', which is mapped independently
! 105: * of the `write' and `addr' ports.
! 106: *
! 107: * NOTE: assumes the caller has filled in sc->sc_read_port!
! 108: */
! 109: int
! 110: isapnp_map_readport(sc)
! 111: struct isapnp_softc *sc;
! 112: {
! 113: #ifdef _KERNEL
! 114: int error;
! 115: #endif
! 116:
! 117: #ifdef _KERNEL
! 118: /* Check if some other device has already claimed this port. */
! 119: if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
! 120: &sc->sc_read_ioh)) != 0)
! 121: return error;
! 122:
! 123: /*
! 124: * XXX: We unmap the port because it can and will be used by other
! 125: * devices such as a joystick. We need a better port accounting
! 126: * scheme with read and write ports.
! 127: */
! 128: bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
! 129: #endif
! 130: return 0;
! 131: }
! 132:
! 133: /* isapnp_unmap_readport():
! 134: * Pretend to unmap a previously mapped `read port'.
! 135: */
! 136: void
! 137: isapnp_unmap_readport(sc)
! 138: struct isapnp_softc *sc;
! 139: {
! 140: /* Do nothing */
! 141: }
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