1 /* $NetBSD: isapnp_machdep.c,v 1.11 2023/12/20 00:40:43 thorpej 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 * Copyright (c) 1997 Thomas Gerner. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
46 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
47 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
48 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
49 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
50 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
51 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
52 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
53 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
54 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
55 */
56
57 /*
58 * Machine-dependent portions of ISA PnP bus autoconfiguration.
59 *
60 * N.B. This file exists mostly to get around some lameness surrounding
61 * the PnP spec. ISA PnP registers live where some `normal' ISA
62 * devices do, but are e.g. write-only registers where the normal
63 * device has a read-only register. This breaks in the presence of
64 * i/o port accounting. This file takes care of mapping ISA PnP
65 * registers without actually allocating them in extent maps.
66 *
67 * Since this is a machine-dependent file, we make all sorts of
68 * assumptions about bus.h's guts. Beware!
69 *
70 * Note: We just use bus_space{,un}map() here, because we need to
71 * actually map the space into KVA space. This works because we
72 * don't do space accounting (we'd need a back-door to bypass it
73 * if we did!).
74 */
75
76 #include <sys/cdefs.h>
77 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.11 2023/12/20 00:40:43 thorpej Exp $");
78
79 #include <sys/param.h>
80 #include <sys/systm.h>
81 #include <sys/device.h>
82
83 #include <sys/bus.h>
84
85 #include <dev/isa/isavar.h>
86
87 #include <dev/isapnp/isapnpreg.h>
88 #include <dev/isapnp/isapnpvar.h>
89
90 #ifdef DIAGNOSTIC
91 #include <machine/iomap.h>
92 #endif
93
94
95 /* isapnp_map():
96 * Map I/O regions used by PnP
97 */
98 int
isapnp_map(struct isapnp_softc * sc)99 isapnp_map(struct isapnp_softc *sc)
100 {
101 #ifdef _KERNEL
102 int error;
103 #endif
104
105 #ifdef DIAGNOSTIC
106 if (sc->sc_iot->base != ISA_IOSTART)
107 panic("isapnp_map: bogus bus space tag");
108 #endif
109
110 #ifdef _KERNEL
111 if ((error = bus_space_map(sc->sc_iot, ISAPNP_ADDR, 1, 0,
112 &sc->sc_addr_ioh)) != 0)
113 return error;
114 if ((error = bus_space_map(sc->sc_iot, ISAPNP_WRDATA, 1, 0,
115 &sc->sc_wrdata_ioh)) != 0)
116 return error;
117 #endif
118 return (0);
119 }
120
121 /* isapnp_unmap():
122 * Unmap I/O regions used by PnP
123 */
124 void
isapnp_unmap(struct isapnp_softc * sc)125 isapnp_unmap(struct isapnp_softc *sc)
126 {
127
128 #ifdef DIAGNOSTIC
129 if (sc->sc_iot->base != ISA_IOSTART)
130 panic("isapnp_map: bogus bus space tag");
131 #endif
132
133 bus_space_unmap(sc->sc_iot, sc->sc_addr_ioh, 1);
134 bus_space_unmap(sc->sc_iot, sc->sc_wrdata_ioh, 1);
135 }
136
137 /* isapnp_map_readport():
138 * Called to map the PnP `read port', which is mapped independently
139 * of the `write' and `addr' ports.
140 *
141 * NOTE: assumes the caller has filled in sc->sc_read_port!
142 */
143 int
isapnp_map_readport(struct isapnp_softc * sc)144 isapnp_map_readport(struct isapnp_softc *sc)
145 {
146 #ifdef _KERNEL
147 int error;
148 #endif
149
150 #ifdef DIAGNOSTIC
151 if (sc->sc_iot->base != ISA_IOSTART)
152 panic("isapnp_map_readport: bogus bus space tag");
153 #endif
154
155 #ifdef _KERNEL
156 /* Check if some other device has already claimed this port. */
157 if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
158 &sc->sc_read_ioh)) != 0)
159 return error;
160 #endif
161 return 0;
162 }
163
164 /* isapnp_unmap_readport():
165 * Pretend to unmap a previously mapped `read port'.
166 */
167 void
isapnp_unmap_readport(struct isapnp_softc * sc)168 isapnp_unmap_readport(struct isapnp_softc *sc)
169 {
170
171 #ifdef DIAGNOSTIC
172 if (sc->sc_iot->base != ISA_IOSTART)
173 panic("isapnp_map_readport: bogus bus space tag");
174 #endif
175
176 bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
177 }
178