1 /* $OpenBSD: isapnp_machdep.c,v 1.4 2008/06/26 05:42:08 ray Exp $ */
2 /* $NetBSD: isapnp_machdep.c,v 1.3 1998/09/05 15:28:04 christos Exp $ */
3
4 /*-
5 * Copyright (c) 1996, 1997, 1998 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 and by Christos Zoulas.
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 *
21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * Machine-dependent portions of ISA PnP bus autoconfiguration.
36 *
37 * N.B. This file exists mostly to get around some lameness surrounding
38 * the PnP spec. ISA PnP registers live where some `normal' ISA
39 * devices do, but are e.g. write-only registers where the normal
40 * device has a read-only register. This breaks in the presence of
41 * i/o port accounting. This file takes care of mapping ISA PnP
42 * registers without actually allocating them in extent maps.
43 *
44 * Since this is a machine-dependent file, we make all sorts of
45 * assumptions about bus.h's guts. Beware!
46 */
47
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/device.h>
51 #include <sys/malloc.h>
52
53 #include <machine/bus.h>
54
55 #include <dev/isa/isavar.h>
56
57 #include <dev/isa/isapnpreg.h>
58 /* #include <dev/isapnp/isapnpvar.h> */
59
60 /* isapnp_map():
61 * Map I/O regions used by PnP
62 */
63 int
isapnp_map(sc)64 isapnp_map(sc)
65 struct isapnp_softc *sc;
66 {
67 int error;
68
69 error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_ADDR, 1, 0,
70 &sc->sc_addr_ioh);
71 if (error)
72 return (error);
73
74 error = alpha_bus_space_map_noacct(sc->sc_iot, ISAPNP_WRDATA, 1, 0,
75 &sc->sc_wrdata_ioh);
76 if (error) {
77 alpha_bus_space_unmap_noacct(sc->sc_iot, sc->sc_addr_ioh, 1);
78 return (error);
79 }
80
81 return (0);
82 }
83
84 /* isapnp_unmap():
85 * Unmap I/O regions used by PnP
86 */
87 void
isapnp_unmap(sc)88 isapnp_unmap(sc)
89 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
isapnp_map_readport(sc)103 isapnp_map_readport(sc)
104 struct isapnp_softc *sc;
105 {
106 #ifdef _KERNEL
107 int error;
108 #endif
109
110 #ifdef _KERNEL
111 /* Check if some other device has already claimed this port. */
112 if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
113 &sc->sc_read_ioh)) != 0)
114 return error;
115
116 /*
117 * XXX: We unmap the port because it can and will be used by other
118 * devices such as a joystick. We need a better port accounting
119 * scheme with read and write ports.
120 */
121 bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
122 #endif
123 return 0;
124 }
125
126 /* isapnp_unmap_readport():
127 * Pretend to unmap a previously mapped `read port'.
128 */
129 void
isapnp_unmap_readport(sc)130 isapnp_unmap_readport(sc)
131 struct isapnp_softc *sc;
132 {
133 /* Do nothing */
134 }
135