1 /* $NetBSD: isapnp_machdep.c,v 1.7 2005/12/11 12:16:39 christos Exp $ */ 2 /* $OpenBSD: isapnp_machdep.c,v 1.1 1997/12/27 12:13:11 niklas Exp $ */ 3 /* NetBSD: isapnp_machdep.c,v 1.5 1997/10/04 17:32:30 thorpej Exp */ 4 5 /*- 6 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 11 * NASA Ames Research Center and by Christos Zoulas. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the NetBSD 24 * Foundation, Inc. and its contributors. 25 * 4. Neither the name of The NetBSD Foundation nor the names of its 26 * contributors may be used to endorse or promote products derived 27 * from this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 30 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 31 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 32 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 33 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 34 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 35 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 36 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 37 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 39 * POSSIBILITY OF SUCH DAMAGE. 40 */ 41 42 /* 43 * Machine-dependent portions of ISA PnP bus autoconfiguration. 44 * 45 * N.B. This file exists mostly to get around some lameness surrounding 46 * the PnP spec. ISA PnP registers live where some `normal' ISA 47 * devices do, but are e.g. write-only registers where the normal 48 * device has a read-only register. This breaks in the presence of 49 * i/o port accounting. This file takes care of mapping ISA PnP 50 * registers without actually allocating them in extent maps. 51 * 52 * Since this is a machine-dependent file, we make all sorts of 53 * assumptions about bus.h's guts. Beware! 54 */ 55 56 #include <sys/cdefs.h> 57 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.7 2005/12/11 12:16:39 christos Exp $"); 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/device.h> 62 #include <sys/malloc.h> 63 64 #include <machine/bus.h> 65 66 #include <dev/isa/isavar.h> 67 68 #include <dev/isapnp/isapnpreg.h> 69 #include <dev/isapnp/isapnpvar.h> 70 71 /* isapnp_map(): 72 * Map I/O regions used by PnP 73 */ 74 int 75 isapnp_map(struct isapnp_softc *sc) 76 { 77 bus_space_tag_t bst; 78 79 bst = sc->sc_iot; 80 sc->sc_addr_ioh = bst->bs_vbase + ISAPNP_ADDR - bst->bs_start; 81 sc->sc_wrdata_ioh = bst->bs_vbase + ISAPNP_WRDATA - bst->bs_start; 82 return 0; 83 } 84 85 /* isapnp_unmap(): 86 * Unmap I/O regions used by PnP 87 */ 88 void 89 isapnp_unmap(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(struct isapnp_softc *sc) 103 { 104 #ifdef _KERNEL 105 int error; 106 #endif 107 108 #ifdef _KERNEL 109 /* Check if some other device has already claimed this port. */ 110 if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0, 111 &sc->sc_read_ioh)) != 0) 112 return error; 113 114 /* 115 * XXX: We unmap the port because it can and will be used by other 116 * devices such as a joystick. We need a better port accounting 117 * scheme with read and write ports. 118 */ 119 bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1); 120 #endif 121 return 0; 122 } 123 124 /* isapnp_unmap_readport(): 125 * Pretend to unmap a previously mapped `read port'. 126 */ 127 void 128 isapnp_unmap_readport(struct isapnp_softc *sc) 129 { 130 131 /* Do nothing. */ 132 } 133