1 /* $NetBSD: isapnp_machdep.c,v 1.9 2011/07/01 19:25:41 dyoung 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 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* 36 * Machine-dependent portions of ISA PnP bus autoconfiguration. 37 * 38 * N.B. This file exists mostly to get around some lameness surrounding 39 * the PnP spec. ISA PnP registers live where some `normal' ISA 40 * devices do, but are e.g. write-only registers where the normal 41 * device has a read-only register. This breaks in the presence of 42 * i/o port accounting. This file takes care of mapping ISA PnP 43 * registers without actually allocating them in extent maps. 44 * 45 * Since this is a machine-dependent file, we make all sorts of 46 * assumptions about bus.h's guts. Beware! 47 */ 48 49 #include <sys/cdefs.h> 50 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.9 2011/07/01 19:25:41 dyoung Exp $"); 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/device.h> 55 #include <sys/malloc.h> 56 57 #include <sys/bus.h> 58 59 #include <dev/isa/isavar.h> 60 61 #include <dev/isapnp/isapnpreg.h> 62 #include <dev/isapnp/isapnpvar.h> 63 64 /* isapnp_map(): 65 * Map I/O regions used by PnP 66 */ 67 int 68 isapnp_map(struct isapnp_softc *sc) 69 { 70 bus_space_tag_t bst; 71 72 bst = sc->sc_iot; 73 sc->sc_addr_ioh = bst->bs_vbase + ISAPNP_ADDR - bst->bs_start; 74 sc->sc_wrdata_ioh = bst->bs_vbase + ISAPNP_WRDATA - bst->bs_start; 75 return 0; 76 } 77 78 /* isapnp_unmap(): 79 * Unmap I/O regions used by PnP 80 */ 81 void 82 isapnp_unmap(struct isapnp_softc *sc) 83 { 84 85 /* Do nothing. */ 86 } 87 88 /* isapnp_map_readport(): 89 * Called to map the PnP `read port', which is mapped independently 90 * of the `write' and `addr' ports. 91 * 92 * NOTE: assumes the caller has filled in sc->sc_read_port! 93 */ 94 int 95 isapnp_map_readport(struct isapnp_softc *sc) 96 { 97 #ifdef _KERNEL 98 int error; 99 #endif 100 101 #ifdef _KERNEL 102 /* Check if some other device has already claimed this port. */ 103 if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0, 104 &sc->sc_read_ioh)) != 0) 105 return error; 106 107 /* 108 * XXX: We unmap the port because it can and will be used by other 109 * devices such as a joystick. We need a better port accounting 110 * scheme with read and write ports. 111 */ 112 bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1); 113 #endif 114 return 0; 115 } 116 117 /* isapnp_unmap_readport(): 118 * Pretend to unmap a previously mapped `read port'. 119 */ 120 void 121 isapnp_unmap_readport(struct isapnp_softc *sc) 122 { 123 124 /* Do nothing. */ 125 } 126