1 /* $NetBSD: bus_space.c,v 1.14 2023/04/22 10:09:12 tsutsui Exp $ */
2
3 /*-
4 * Copyright (c) 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.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Implementation of bus_space mapping for the news68k.
34 * Just taken from hp300.
35 */
36
37 #include <sys/cdefs.h>
38 __KERNEL_RCSID(0, "$NetBSD: bus_space.c,v 1.14 2023/04/22 10:09:12 tsutsui Exp $");
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42
43 #include <machine/bus.h>
44
45 #include <uvm/uvm_extern.h>
46
47 extern int *nofault;
48
49 int
bus_space_map(bus_space_tag_t t,bus_addr_t bpa,bus_size_t size,int flags,bus_space_handle_t * bshp)50 bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
51 bus_space_handle_t *bshp)
52 {
53
54 if (t == NEWS68K_BUS_SPACE_INTIO) {
55 /*
56 * Intio space is direct-mapped in pmap_bootstrap(); just
57 * do the translation.
58 */
59 *bshp = (bus_space_handle_t)bpa;
60 return 0;
61 }
62
63 if (t == NEWS68K_BUS_SPACE_EIO) {
64 *bshp = (bus_space_handle_t)bpa; /* XXX use tt0 mapping */
65 return 0;
66 }
67
68 return 1;
69 }
70
71 int
bus_space_alloc(bus_space_tag_t t,bus_addr_t rstart,bus_addr_t rend,bus_size_t size,bus_size_t alignment,bus_size_t boundary,int flags,bus_addr_t * bpap,bus_space_handle_t * bshp)72 bus_space_alloc(bus_space_tag_t t, bus_addr_t rstart, bus_addr_t rend,
73 bus_size_t size, bus_size_t alignment, bus_size_t boundary, int flags,
74 bus_addr_t *bpap, bus_space_handle_t *bshp)
75 {
76
77 /*
78 * Not meaningful on any currently-supported news68k bus.
79 */
80 return EINVAL;
81 }
82
83 void
bus_space_free(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t size)84 bus_space_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
85 {
86
87 /*
88 * Not meaningful on any currently-supported news68k bus.
89 */
90 panic("bus_space_free: shouldn't be here");
91 }
92
93 void
bus_space_unmap(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t size)94 bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
95 {
96
97 if (t == NEWS68K_BUS_SPACE_INTIO) {
98 /*
99 * Intio space is direct-mapped in pmap_bootstrap(); nothing
100 * to do
101 */
102 return;
103 }
104
105 if (t != NEWS68K_BUS_SPACE_EIO)
106 panic("bus_space_map: bad space tag");
107
108 return;
109 }
110
111 int
bus_space_subregion(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t offset,bus_size_t size,bus_space_handle_t * nbshp)112 bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh,
113 bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp)
114 {
115
116 *nbshp = bsh + offset;
117 return 0;
118 }
119
120 int
news68k_bus_space_probe(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t offset,int sz)121 news68k_bus_space_probe(bus_space_tag_t t, bus_space_handle_t bsh,
122 bus_size_t offset, int sz)
123 {
124 label_t faultbuf;
125 int i;
126
127 nofault = (int *)&faultbuf;
128 if (setjmp((label_t *)nofault)) {
129 nofault = NULL;
130 return 0;
131 }
132
133 switch (sz) {
134 case 1:
135 i = bus_space_read_1(t, bsh, offset);
136 break;
137
138 case 2:
139 i = bus_space_read_2(t, bsh, offset);
140 break;
141
142 case 4:
143 i = bus_space_read_4(t, bsh, offset);
144 break;
145
146 default:
147 panic("bus_space_probe: unupported data size %d", sz);
148 /* NOTREACHED */
149 }
150 __USE(i);
151 nofault = NULL;
152 return 1;
153 }
154