1 /* $OpenBSD: isapnp_machdep.c,v 1.4 2008/06/26 05:42:08 ray Exp $ */ 2 /* $NetBSD: isapnp_machdep.c,v 1.3 1998/09/05 15:28:04 christos Exp $ */ 3 4 /*- 5 * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 10 * NASA Ames Research Center and by Christos Zoulas. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * Machine-dependent portions of ISA PnP bus autoconfiguration. 36 * 37 * N.B. This file exists mostly to get around some lameness surrounding 38 * the PnP spec. ISA PnP registers live where some `normal' ISA 39 * devices do, but are e.g. write-only registers where the normal 40 * device has a read-only register. This breaks in the presence of 41 * i/o port accounting. This file takes care of mapping ISA PnP 42 * registers without actually allocating them in extent maps. 43 * 44 * Since this is a machine-dependent file, we make all sorts of 45 * assumptions about bus.h's guts. Beware! 46 */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/device.h> 51 #include <sys/malloc.h> 52 53 #include <machine/bus.h> 54 55 #include <dev/isa/isavar.h> 56 57 #include <dev/isa/isapnpreg.h> 58 /* #include <dev/isapnp/isapnpvar.h> */ 59 60 /* isapnp_map(): 61 * Map I/O regions used by PnP 62 */ 63 int 64 isapnp_map(sc) 65 struct isapnp_softc *sc; 66 { 67 int error; 68 69 error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_ADDR, 1, 0, 70 &sc->sc_addr_ioh); 71 if (error) 72 return (error); 73 74 error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_WRDATA, 1, 0, 75 &sc->sc_wrdata_ioh); 76 if (error) { 77 alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1); 78 return (error); 79 } 80 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 alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1); 93 alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_wrdata_ioh, 1); 94 } 95 96 /* isapnp_map_readport(): 97 * Called to map the PnP `read port', which is mapped independently 98 * of the `write' and `addr' ports. 99 * 100 * NOTE: assumes the caller has filled in sc->sc_read_port! 101 */ 102 int 103 isapnp_map_readport(sc) 104 struct isapnp_softc *sc; 105 { 106 #ifdef _KERNEL 107 int error; 108 #endif 109 110 #ifdef _KERNEL 111 /* Check if some other device has already claimed this port. */ 112 if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0, 113 &sc->sc_read_ioh)) != 0) 114 return error; 115 116 /* 117 * XXX: We unmap the port because it can and will be used by other 118 * devices such as a joystick. We need a better port accounting 119 * scheme with read and write ports. 120 */ 121 bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1); 122 #endif 123 return 0; 124 } 125 126 /* isapnp_unmap_readport(): 127 * Pretend to unmap a previously mapped `read port'. 128 */ 129 void 130 isapnp_unmap_readport(sc) 131 struct isapnp_softc *sc; 132 { 133 /* Do nothing */ 134 } 135