1 /* $NetBSD: isapnp_machdep.c,v 1.6 1998/09/05 15:28:07 christos 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/param.h> 55 #include <sys/systm.h> 56 #include <sys/device.h> 57 #include <sys/malloc.h> 58 59 #include <machine/bus.h> 60 61 #include <dev/isa/isavar.h> 62 63 #include <dev/isapnp/isapnpreg.h> 64 #include <dev/isapnp/isapnpvar.h> 65 66 /* isapnp_map(): 67 * Map I/O regions used by PnP 68 */ 69 int 70 isapnp_map(sc) 71 struct isapnp_softc *sc; 72 { 73 74 #ifdef DIAGNOSTIC 75 if (sc->sc_iot != I386_BUS_SPACE_IO) 76 panic("isapnp_map: bogus bus space tag"); 77 #endif 78 79 sc->sc_addr_ioh = ISAPNP_ADDR; 80 sc->sc_wrdata_ioh = ISAPNP_WRDATA; 81 return (0); 82 } 83 84 /* isapnp_unmap(): 85 * Unmap I/O regions used by PnP 86 */ 87 void 88 isapnp_unmap(sc) 89 struct isapnp_softc *sc; 90 { 91 92 /* Do nothing. */ 93 } 94 95 /* isapnp_map_readport(): 96 * Called to map the PnP `read port', which is mapped independently 97 * of the `write' and `addr' ports. 98 * 99 * NOTE: assumes the caller has filled in sc->sc_read_port! 100 */ 101 int 102 isapnp_map_readport(sc) 103 struct isapnp_softc *sc; 104 { 105 #ifdef _KERNEL 106 int error; 107 #endif 108 109 #ifdef DIAGNOSTIC 110 if (sc->sc_iot != I386_BUS_SPACE_IO) 111 panic("isapnp_map_readport: bogus bus space tag"); 112 #endif 113 114 #ifdef _KERNEL 115 /* Check if some other device has already claimed this port. */ 116 if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0, 117 &sc->sc_read_ioh)) != 0) 118 return error; 119 120 /* 121 * XXX: We unmap the port because it can and will be used by other 122 * devices such as a joystick. We need a better port accounting 123 * scheme with read and write ports. 124 */ 125 bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1); 126 #endif 127 return 0; 128 } 129 130 /* isapnp_unmap_readport(): 131 * Pretend to unmap a previously mapped `read port'. 132 */ 133 void 134 isapnp_unmap_readport(sc) 135 struct isapnp_softc *sc; 136 { 137 138 /* Do nothing */ 139 } 140