1 /* $NetBSD: isapnp_machdep.c,v 1.9 2009/10/21 21:57:39 snj 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1997 Thomas Gerner. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 46 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 47 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 48 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 49 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 50 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 51 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 52 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 53 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 54 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 55 */ 56 57 /* 58 * Machine-dependent portions of ISA PnP bus autoconfiguration. 59 * 60 * N.B. This file exists mostly to get around some lameness surrounding 61 * the PnP spec. ISA PnP registers live where some `normal' ISA 62 * devices do, but are e.g. write-only registers where the normal 63 * device has a read-only register. This breaks in the presence of 64 * i/o port accounting. This file takes care of mapping ISA PnP 65 * registers without actually allocating them in extent maps. 66 * 67 * Since this is a machine-dependent file, we make all sorts of 68 * assumptions about bus.h's guts. Beware! 69 * 70 * Note: We just use bus_space{,un}map() here, because we need to 71 * actually map the space into KVA space. This works because we 72 * don't do space accounting (we'd need a back-door to bypass it 73 * if we did!). 74 */ 75 76 #include <sys/cdefs.h> 77 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.9 2009/10/21 21:57:39 snj Exp $"); 78 79 #include <sys/param.h> 80 #include <sys/systm.h> 81 #include <sys/device.h> 82 #include <sys/malloc.h> 83 84 #include <machine/bus.h> 85 86 #include <dev/isa/isavar.h> 87 88 #include <dev/isapnp/isapnpreg.h> 89 #include <dev/isapnp/isapnpvar.h> 90 91 #ifdef DIAGNOSTIC 92 #include <machine/iomap.h> 93 #endif 94 95 96 /* isapnp_map(): 97 * Map I/O regions used by PnP 98 */ 99 int 100 isapnp_map(struct isapnp_softc *sc) 101 { 102 #ifdef _KERNEL 103 int error; 104 #endif 105 106 #ifdef DIAGNOSTIC 107 if (sc->sc_iot->base != ISA_IOSTART) 108 panic("isapnp_map: bogus bus space tag"); 109 #endif 110 111 #ifdef _KERNEL 112 if ((error = bus_space_map(sc->sc_iot, ISAPNP_ADDR, 1, 0, 113 &sc->sc_addr_ioh)) != 0) 114 return error; 115 if ((error = bus_space_map(sc->sc_iot, ISAPNP_WRDATA, 1, 0, 116 &sc->sc_wrdata_ioh)) != 0) 117 return error; 118 #endif 119 return (0); 120 } 121 122 /* isapnp_unmap(): 123 * Unmap I/O regions used by PnP 124 */ 125 void 126 isapnp_unmap(struct isapnp_softc *sc) 127 { 128 129 #ifdef DIAGNOSTIC 130 if (sc->sc_iot->base != ISA_IOSTART) 131 panic("isapnp_map: bogus bus space tag"); 132 #endif 133 134 bus_space_unmap(sc->sc_iot, sc->sc_addr_ioh, 1); 135 bus_space_unmap(sc->sc_iot, sc->sc_wrdata_ioh, 1); 136 } 137 138 /* isapnp_map_readport(): 139 * Called to map the PnP `read port', which is mapped independently 140 * of the `write' and `addr' ports. 141 * 142 * NOTE: assumes the caller has filled in sc->sc_read_port! 143 */ 144 int 145 isapnp_map_readport(struct isapnp_softc *sc) 146 { 147 #ifdef _KERNEL 148 int error; 149 #endif 150 151 #ifdef DIAGNOSTIC 152 if (sc->sc_iot->base != ISA_IOSTART) 153 panic("isapnp_map_readport: bogus bus space tag"); 154 #endif 155 156 #ifdef _KERNEL 157 /* Check if some other device has already claimed this port. */ 158 if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0, 159 &sc->sc_read_ioh)) != 0) 160 return error; 161 #endif 162 return 0; 163 } 164 165 /* isapnp_unmap_readport(): 166 * Pretend to unmap a previously mapped `read port'. 167 */ 168 void 169 isapnp_unmap_readport(struct isapnp_softc *sc) 170 { 171 172 #ifdef DIAGNOSTIC 173 if (sc->sc_iot->base != ISA_IOSTART) 174 panic("isapnp_map_readport: bogus bus space tag"); 175 #endif 176 177 bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1); 178 } 179