1 /* $NetBSD: bus_space.c,v 1.22 2023/04/21 23:01:59 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 hp300.
34 */
35
36 #include <sys/cdefs.h>
37 __KERNEL_RCSID(0, "$NetBSD: bus_space.c,v 1.22 2023/04/21 23:01:59 tsutsui Exp $");
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/extent.h>
42
43 #include <machine/autoconf.h>
44 #include <machine/bus.h>
45
46 #include <uvm/uvm_extern.h>
47
48 extern int *nofault;
49
50 int
bus_space_map(bus_space_tag_t t,bus_addr_t bpa,bus_size_t size,int flags,bus_space_handle_t * bshp)51 bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
52 bus_space_handle_t *bshp)
53 {
54 vaddr_t kva;
55 vsize_t offset;
56 int error;
57
58 if (t->bustype == HP300_BUS_SPACE_INTIO) {
59 /*
60 * Intio space is direct-mapped in pmap_bootstrap(); just
61 * do the translation.
62 */
63 *bshp = (bus_space_handle_t)IIOV(INTIOBASE + bpa);
64 return 0;
65 }
66
67 if (t->bustype != HP300_BUS_SPACE_DIO &&
68 t->bustype != HP300_BUS_SPACE_SGC)
69 panic("%s: bad space tag", __func__);
70
71 /*
72 * Allocate virtual address space from the extio extent map.
73 */
74 offset = m68k_page_offset(bpa);
75 size = m68k_round_page(offset + size);
76 error = extent_alloc(extio_ex, size, PAGE_SIZE, 0,
77 EX_FAST | EX_NOWAIT | (extio_ex_malloc_safe ? EX_MALLOCOK : 0),
78 &kva);
79 if (error)
80 return error;
81
82 /*
83 * Map the range. The range is always cache-inhibited on the hp300.
84 */
85 physaccess((void *)kva, (void *)bpa, size, PG_RW|PG_CI);
86
87 /*
88 * All done.
89 */
90 *bshp = (bus_space_handle_t)(kva + offset);
91 return 0;
92 }
93
94 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)95 bus_space_alloc(bus_space_tag_t t, bus_addr_t rstart, bus_addr_t rend,
96 bus_size_t size, bus_size_t alignment, bus_size_t boundary, int flags,
97 bus_addr_t *bpap, bus_space_handle_t *bshp)
98 {
99
100 /*
101 * Not meaningful on any currently-supported hp300 bus.
102 */
103 return EINVAL;
104 }
105
106 void
bus_space_free(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t size)107 bus_space_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
108 {
109
110 /*
111 * Not meaningful on any currently-supported hp300 bus.
112 */
113 panic("%s: shouldn't be here", __func__);
114 }
115
116 void
bus_space_unmap(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t size)117 bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
118 {
119 vaddr_t kva;
120 vsize_t offset;
121
122 if (t->bustype == HP300_BUS_SPACE_INTIO) {
123 /*
124 * Intio space is direct-mapped in pmap_bootstrap(); nothing
125 * to do
126 */
127 return;
128 }
129
130 if (t->bustype != HP300_BUS_SPACE_DIO &&
131 t->bustype != HP300_BUS_SPACE_SGC)
132 panic("%s: bad space tag", __func__);
133
134 kva = m68k_trunc_page(bsh);
135 offset = m68k_page_offset(bsh);
136 size = m68k_round_page(offset + size);
137
138 #ifdef DIAGNOSTIC
139 if (bsh < (vaddr_t)extiobase ||
140 bsh >= ((vaddr_t)extiobase + ptoa(EIOMAPSIZE)))
141 panic("%s: bad bus space handle", __func__);
142 #endif
143
144 /*
145 * Unmap the range.
146 */
147 physunaccess((void *)kva, size);
148
149 /*
150 * Free it from the extio extent map.
151 */
152 if (extent_free(extio_ex, kva, size,
153 EX_NOWAIT | (extio_ex_malloc_safe ? EX_MALLOCOK : 0)))
154 printf("%s: kva 0x%lx size 0x%lx: "
155 "can't free region\n", __func__, (u_long)bsh, size);
156 }
157
158 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)159 bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh,
160 bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp)
161 {
162
163 *nbshp = bsh + offset;
164 return 0;
165 }
166
167 int
hp300_bus_space_probe(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t offset,int sz)168 hp300_bus_space_probe(bus_space_tag_t t, bus_space_handle_t bsh,
169 bus_size_t offset, int sz)
170 {
171 label_t faultbuf;
172 int i;
173
174 nofault = (int *)&faultbuf;
175 if (setjmp((label_t *)nofault)) {
176 nofault = NULL;
177 return 0;
178 }
179
180 switch (sz) {
181 case 1:
182 i = bus_space_read_1(t, bsh, offset);
183 break;
184
185 case 2:
186 i = bus_space_read_2(t, bsh, offset);
187 break;
188
189 case 4:
190 i = bus_space_read_4(t, bsh, offset);
191 break;
192
193 default:
194 panic("%s: unupported data size %d", __func__, sz);
195 /* NOTREACHED */
196 }
197 __USE(i);
198 nofault = NULL;
199 return 1;
200 }
201