1 /* $NetBSD: isapnp_machdep.c,v 1.7 2001/11/15 07:03:32 lukem 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Machine-dependent portions of ISA PnP bus autoconfiguration. 42 * 43 * N.B. This file exists mostly to get around some lameness surrounding 44 * the PnP spec. ISA PnP registers live where some `normal' ISA 45 * devices do, but are e.g. write-only registers where the normal 46 * device has a read-only register. This breaks in the presence of 47 * i/o port accounting. This file takes care of mapping ISA PnP 48 * registers without actually allocating them in extent maps. 49 * 50 * Since this is a machine-dependent file, we make all sorts of 51 * assumptions about bus.h's guts. Beware! 52 */ 53 54 #include <sys/cdefs.h> 55 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.7 2001/11/15 07:03:32 lukem Exp $"); 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/device.h> 60 #include <sys/malloc.h> 61 62 #include <machine/bus.h> 63 64 #include <dev/isa/isavar.h> 65 66 #include <dev/isapnp/isapnpreg.h> 67 #include <dev/isapnp/isapnpvar.h> 68 69 /* isapnp_map(): 70 * Map I/O regions used by PnP 71 */ 72 int 73 isapnp_map(sc) 74 struct isapnp_softc *sc; 75 { 76 77 #ifdef DIAGNOSTIC 78 if (sc->sc_iot != I386_BUS_SPACE_IO) 79 panic("isapnp_map: bogus bus space tag"); 80 #endif 81 82 sc->sc_addr_ioh = ISAPNP_ADDR; 83 sc->sc_wrdata_ioh = ISAPNP_WRDATA; 84 return (0); 85 } 86 87 /* isapnp_unmap(): 88 * Unmap I/O regions used by PnP 89 */ 90 void 91 isapnp_unmap(sc) 92 struct isapnp_softc *sc; 93 { 94 95 /* Do nothing. */ 96 } 97 98 /* isapnp_map_readport(): 99 * Called to map the PnP `read port', which is mapped independently 100 * of the `write' and `addr' ports. 101 * 102 * NOTE: assumes the caller has filled in sc->sc_read_port! 103 */ 104 int 105 isapnp_map_readport(sc) 106 struct isapnp_softc *sc; 107 { 108 #ifdef _KERNEL 109 int error; 110 #endif 111 112 #ifdef DIAGNOSTIC 113 if (sc->sc_iot != I386_BUS_SPACE_IO) 114 panic("isapnp_map_readport: bogus bus space tag"); 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 { 140 141 /* Do nothing */ 142 } 143