1 /* $NetBSD: isapnp_machdep.c,v 1.7 2022/09/27 06:36:41 skrll 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. This works because we
71 * don't do space accounting (we'd need a back-door to bypass it
72 * if we did!).
73 */
74
75 #include <sys/cdefs.h>
76 __KERNEL_RCSID(0, "$NetBSD: isapnp_machdep.c,v 1.7 2022/09/27 06:36:41 skrll Exp $");
77
78 #include <sys/param.h>
79 #include <sys/systm.h>
80 #include <sys/device.h>
81
82 #include <sys/bus.h>
83
84 #include <dev/isa/isavar.h>
85
86 #include <dev/isapnp/isapnpreg.h>
87 #include <dev/isapnp/isapnpvar.h>
88
89 /* isapnp_map():
90 * Map I/O regions used by PnP
91 */
92 int
isapnp_map(struct isapnp_softc * sc)93 isapnp_map(struct isapnp_softc *sc)
94 {
95 #ifdef _KERNEL
96 int error;
97 #endif
98
99 #ifdef _KERNEL
100 if ((error = bus_space_map(sc->sc_iot, ISAPNP_ADDR, 1, 0,
101 &sc->sc_addr_ioh)) != 0)
102 return error;
103 if ((error = bus_space_map(sc->sc_iot, ISAPNP_WRDATA, 1, 0,
104 &sc->sc_wrdata_ioh)) != 0)
105 return error;
106 #endif
107 return (0);
108 }
109
110 /* isapnp_unmap():
111 * Unmap I/O regions used by PnP
112 */
113 void
isapnp_unmap(struct isapnp_softc * sc)114 isapnp_unmap(struct isapnp_softc *sc)
115 {
116
117 bus_space_unmap(sc->sc_iot, sc->sc_addr_ioh, 1);
118 bus_space_unmap(sc->sc_iot, sc->sc_wrdata_ioh, 1);
119 }
120
121 /* isapnp_map_readport():
122 * Called to map the PnP `read port', which is mapped independently
123 * of the `write' and `addr' ports.
124 *
125 * NOTE: assumes the caller has filled in sc->sc_read_port!
126 */
127 int
isapnp_map_readport(struct isapnp_softc * sc)128 isapnp_map_readport(struct isapnp_softc *sc)
129 {
130 #ifdef _KERNEL
131 int error;
132 #endif
133
134 #ifdef _KERNEL
135 /* Check if some other device has already claimed this port. */
136 if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
137 &sc->sc_read_ioh)) != 0)
138 return error;
139 #endif
140 return 0;
141 }
142
143 /* isapnp_unmap_readport():
144 * Pretend to unmap a previously mapped `read port'.
145 */
146 void
isapnp_unmap_readport(struct isapnp_softc * sc)147 isapnp_unmap_readport(struct isapnp_softc *sc)
148 {
149
150 bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
151 }
152