isapnp_machdep.c revision 1.7.8.1
1 /* $NetBSD: isapnp_machdep.c,v 1.7.8.1 2009/04/28 07:33:52 skrll 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 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgement: 46 * This product includes software developed by Christos Zoulas. 47 * 4. The name of the author may not be used to endorse or promote products 48 * derived from this software without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 51 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 52 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 53 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 54 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 55 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 59 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 60 */ 61 62 /* 63 * Machine-dependent portions of ISA PnP bus autoconfiguration. 64 * 65 * N.B. This file exists mostly to get around some lameness surrounding 66 * the PnP spec. ISA PnP registers live where some `normal' ISA 67 * devices do, but are e.g. write-only registers where the normal 68 * device has a read-only register. This breaks in the presence of 69 * i/o port accounting. This file takes care of mapping ISA PnP 70 * registers without actually allocating them in extent maps. 71 * 72 * Since this is a machine-dependent file, we make all sorts of 73 * assumptions about bus.h's guts. Beware! 74 * 75 * Note: We just use bus_space{,un}map() here, because we need to 76 * actually map the space into KVA space. This works because we 77 * don't do space accounting (we'd need a back-door to bypass it 78 * if we did!). 79 */ 80 81 #include <sys/cdefs.h> 82 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.7.8.1 2009/04/28 07:33:52 skrll Exp $"); 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/isavar.h> 92 93 #include <dev/isapnp/isapnpreg.h> 94 #include <dev/isapnp/isapnpvar.h> 95 96 #ifdef DIAGNOSTIC 97 #include <machine/iomap.h> 98 #endif 99 100 101 /* isapnp_map(): 102 * Map I/O regions used by PnP 103 */ 104 int 105 isapnp_map(struct isapnp_softc *sc) 106 { 107 #ifdef _KERNEL 108 int error; 109 #endif 110 111 #ifdef DIAGNOSTIC 112 if (sc->sc_iot->base != ISA_IOSTART) 113 panic("isapnp_map: bogus bus space tag"); 114 #endif 115 116 #ifdef _KERNEL 117 if ((error = bus_space_map(sc->sc_iot, ISAPNP_ADDR, 1, 0, 118 &sc->sc_addr_ioh)) != 0) 119 return error; 120 if ((error = bus_space_map(sc->sc_iot, ISAPNP_WRDATA, 1, 0, 121 &sc->sc_wrdata_ioh)) != 0) 122 return error; 123 #endif 124 return (0); 125 } 126 127 /* isapnp_unmap(): 128 * Unmap I/O regions used by PnP 129 */ 130 void 131 isapnp_unmap(struct isapnp_softc *sc) 132 { 133 134 #ifdef DIAGNOSTIC 135 if (sc->sc_iot->base != ISA_IOSTART) 136 panic("isapnp_map: bogus bus space tag"); 137 #endif 138 139 bus_space_unmap(sc->sc_iot, sc->sc_addr_ioh, 1); 140 bus_space_unmap(sc->sc_iot, sc->sc_wrdata_ioh, 1); 141 } 142 143 /* isapnp_map_readport(): 144 * Called to map the PnP `read port', which is mapped independently 145 * of the `write' and `addr' ports. 146 * 147 * NOTE: assumes the caller has filled in sc->sc_read_port! 148 */ 149 int 150 isapnp_map_readport(struct isapnp_softc *sc) 151 { 152 #ifdef _KERNEL 153 int error; 154 #endif 155 156 #ifdef DIAGNOSTIC 157 if (sc->sc_iot->base != ISA_IOSTART) 158 panic("isapnp_map_readport: bogus bus space tag"); 159 #endif 160 161 #ifdef _KERNEL 162 /* Check if some other device has already claimed this port. */ 163 if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0, 164 &sc->sc_read_ioh)) != 0) 165 return error; 166 #endif 167 return 0; 168 } 169 170 /* isapnp_unmap_readport(): 171 * Pretend to unmap a previously mapped `read port'. 172 */ 173 void 174 isapnp_unmap_readport(struct isapnp_softc *sc) 175 { 176 177 #ifdef DIAGNOSTIC 178 if (sc->sc_iot->base != ISA_IOSTART) 179 panic("isapnp_map_readport: bogus bus space tag"); 180 #endif 181 182 bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1); 183 } 184
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