1 /* $NetBSD: isapnp_machdep.c,v 1.17 2011/07/01 18:11:24 dyoung 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 * Machine-dependent portions of ISA PnP bus autoconfiguration. 35 * 36 * N.B. This file exists mostly to get around some lameness surrounding 37 * the PnP spec. ISA PnP registers live where some `normal' ISA 38 * devices do, but are e.g. write-only registers where the normal 39 * device has a read-only register. This breaks in the presence of 40 * i/o port accounting. This file takes care of mapping ISA PnP 41 * registers without actually allocating them in extent maps. 42 * 43 * Since this is a machine-dependent file, we make all sorts of 44 * assumptions about bus.h's guts. Beware! 45 */ 46 47 #include <sys/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.17 2011/07/01 18:11:24 dyoung Exp $"); 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/device.h> 53 #include <sys/malloc.h> 54 55 #include <sys/bus.h> 56 57 #include <dev/isa/isavar.h> 58 59 #include <dev/isapnp/isapnpreg.h> 60 #include <dev/isapnp/isapnpvar.h> 61 62 /* isapnp_map(): 63 * Map I/O regions used by PnP 64 */ 65 int 66 isapnp_map(struct isapnp_softc *sc) 67 { 68 69 #ifdef DIAGNOSTIC 70 if (!bus_space_is_equal(sc->sc_iot, x86_bus_space_io)) 71 panic("isapnp_map: bogus bus space tag"); 72 #endif 73 74 sc->sc_addr_ioh = ISAPNP_ADDR; 75 sc->sc_wrdata_ioh = ISAPNP_WRDATA; 76 return (0); 77 } 78 79 /* isapnp_unmap(): 80 * Unmap I/O regions used by PnP 81 */ 82 void 83 isapnp_unmap(struct isapnp_softc *sc) 84 { 85 86 /* Do nothing. */ 87 } 88 89 /* isapnp_map_readport(): 90 * Called to map the PnP `read port', which is mapped independently 91 * of the `write' and `addr' ports. 92 * 93 * NOTE: assumes the caller has filled in sc->sc_read_port! 94 */ 95 int 96 isapnp_map_readport(struct isapnp_softc *sc) 97 { 98 #ifdef _KERNEL 99 int error; 100 #endif 101 102 #ifdef DIAGNOSTIC 103 if (!bus_space_is_equal(sc->sc_iot, x86_bus_space_io)) 104 panic("isapnp_map_readport: bogus bus space tag"); 105 #endif 106 107 #ifdef _KERNEL 108 /* Check if some other device has already claimed this port. */ 109 if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0, 110 &sc->sc_read_ioh)) != 0) 111 return error; 112 113 /* 114 * XXX: We unmap the port because it can and will be used by other 115 * devices such as a joystick. We need a better port accounting 116 * scheme with read and write ports. 117 */ 118 bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1); 119 #endif 120 return 0; 121 } 122 123 /* isapnp_unmap_readport(): 124 * Pretend to unmap a previously mapped `read port'. 125 */ 126 void 127 isapnp_unmap_readport(struct isapnp_softc *sc) 128 { 129 130 /* Do nothing */ 131 } 132