1 /* $NetBSD: isapnp_machdep.c,v 1.7 2009/03/14 15:35:59 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997, 1998 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 1.7 2009/03/14 15:35:59 dsl 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 <machine/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 int error; 69 70 error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_ADDR, 1, 0, 71 &sc->sc_addr_ioh); 72 if (error) 73 return (error); 74 75 error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_WRDATA, 1, 0, 76 &sc->sc_wrdata_ioh); 77 if (error) { 78 alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1); 79 return (error); 80 } 81 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 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(struct isapnp_softc *sc) 104 { 105 #ifdef _KERNEL 106 int error; 107 #endif 108 109 #ifdef _KERNEL 110 /* Check if some other device has already claimed this port. */ 111 if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0, 112 &sc->sc_read_ioh)) != 0) 113 return error; 114 115 /* 116 * XXX: We unmap the port because it can and will be used by other 117 * devices such as a joystick. We need a better port accounting 118 * scheme with read and write ports. 119 */ 120 bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1); 121 #endif 122 return 0; 123 } 124 125 /* isapnp_unmap_readport(): 126 * Pretend to unmap a previously mapped `read port'. 127 */ 128 void 129 isapnp_unmap_readport(struct isapnp_softc *sc) 130 { 131 132 /* Do nothing */ 133 } 134