Annotation of sys/arch/i386/isa/isapnp_machdep.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: isapnp_machdep.c,v 1.3 2006/09/19 11:06:34 jsg Exp $ */
2: /* $NetBSD: isapnp_machdep.c,v 1.5 1997/10/04 17:32:30 thorpej Exp $ */
3:
4: /*-
5: * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
10: * NASA Ames Research Center.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. All advertising materials mentioning features or use of this software
21: * must display the following acknowledgement:
22: * This product includes software developed by the NetBSD
23: * Foundation, Inc. and its contributors.
24: * 4. Neither the name of The NetBSD Foundation nor the names of its
25: * contributors may be used to endorse or promote products derived
26: * from this software without specific prior written permission.
27: *
28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38: * POSSIBILITY OF SUCH DAMAGE.
39: */
40:
41: /*
42: * Copyright (c) 1996 Christos Zoulas. All rights reserved.
43: *
44: * Redistribution and use in source and binary forms, with or without
45: * modification, are permitted provided that the following conditions
46: * are met:
47: * 1. Redistributions of source code must retain the above copyright
48: * notice, this list of conditions and the following disclaimer.
49: * 2. Redistributions in binary form must reproduce the above copyright
50: * notice, this list of conditions and the following disclaimer in the
51: * documentation and/or other materials provided with the distribution.
52: * 3. All advertising materials mentioning features or use of this software
53: * must display the following acknowledgement:
54: * This product includes software developed by Christos Zoulas.
55: * 4. The name of the author may not be used to endorse or promote products
56: * derived from this software without specific prior written permission.
57: *
58: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
59: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
60: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
61: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
62: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
63: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
64: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
65: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
66: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
67: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
68: */
69:
70: /*
71: * Machine-dependent portions of ISA PnP bus autoconfiguration.
72: *
73: * N.B. This file exists mostly to get around some lameness surrounding
74: * the PnP spec. ISA PnP registers live where some `normal' ISA
75: * devices do, but are e.g. write-only registers where the normal
76: * device has a read-only register. This breaks in the presence of
77: * i/o port accounting. This file takes care of mapping ISA PnP
78: * registers without actually allocating them in extent maps.
79: *
80: * Since this is a machine-dependent file, we make all sorts of
81: * assumptions about bus.h's guts. Beware!
82: */
83:
84: #include <sys/param.h>
85: #include <sys/systm.h>
86: #include <sys/device.h>
87: #include <sys/malloc.h>
88:
89: #include <machine/bus.h>
90:
91: #include <dev/isa/isapnpreg.h>
92:
93: #include <dev/isa/isavar.h>
94:
95: /* isapnp_map():
96: * Map I/O regions used by PnP
97: */
98: int
99: isapnp_map(struct isapnp_softc *sc)
100: {
101:
102: #ifdef DIAGNOSTIC
103: if (sc->sc_iot != I386_BUS_SPACE_IO)
104: panic("isapnp_map: bogus bus space tag");
105: #endif
106:
107: sc->sc_addr_ioh = ISAPNP_ADDR;
108: sc->sc_wrdata_ioh = ISAPNP_WRDATA;
109: return (0);
110: }
111:
112: /* isapnp_unmap():
113: * Unmap I/O regions used by PnP
114: */
115: void
116: isapnp_unmap(struct isapnp_softc *sc)
117: {
118:
119: /* Do nothing. */
120: }
121:
122: /* isapnp_map_readport():
123: * Called to map the PnP `read port', which is mapped independently
124: * of the `write' and `addr' ports.
125: *
126: * NOTE: assumes the caller has filled in sc->sc_read_port!
127: */
128: int
129: isapnp_map_readport(struct isapnp_softc *sc)
130: {
131: #ifdef _KERNEL
132: int error;
133: #endif
134:
135: #ifdef DIAGNOSTIC
136: if (sc->sc_iot != I386_BUS_SPACE_IO)
137: panic("isapnp_map_readport: bogus bus space tag");
138: #endif
139:
140: #ifdef _KERNEL
141: /* Check if some other device has already claimed this port. */
142: if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
143: &sc->sc_read_ioh)) != 0)
144: return error;
145:
146: /*
147: * XXX: We unmap the port because it can and will be used by other
148: * devices such as a joystick. We need a better port accounting
149: * scheme with read and write ports.
150: */
151: bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
152: #endif
153: return 0;
154: }
155:
156: /* isapnp_unmap_readport():
157: * Pretend to unmap a previously mapped `read port'.
158: */
159: void
160: isapnp_unmap_readport(struct isapnp_softc *sc)
161: {
162:
163: /* Do nothing */
164: }
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