Line data Source code
1 : /* $OpenBSD: rbus.c,v 1.16 2010/09/22 02:28:37 jsg Exp $ */
2 : /* $NetBSD: rbus.c,v 1.3 1999/11/06 06:20:53 soren Exp $ */
3 : /*
4 : * Copyright (c) 1999
5 : * HAYAKAWA Koichi. All rights reserved.
6 : *
7 : * Redistribution and use in source and binary forms, with or without
8 : * modification, are permitted provided that the following conditions
9 : * are met:
10 : * 1. Redistributions of source code must retain the above copyright
11 : * notice, this list of conditions and the following disclaimer.
12 : * 2. Redistributions in binary form must reproduce the above copyright
13 : * notice, this list of conditions and the following disclaimer in the
14 : * documentation and/or other materials provided with the distribution.
15 : *
16 : * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 : * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 : * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 : * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 : * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 : * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 : * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 : * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 : * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 : * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 : */
27 :
28 : #include <sys/param.h>
29 : #include <sys/systm.h>
30 : #include <sys/device.h>
31 : #include <sys/malloc.h>
32 : #include <sys/extent.h>
33 :
34 : #include <machine/bus.h>
35 :
36 : #include <dev/cardbus/rbus.h>
37 :
38 : /* #define RBUS_DEBUG */
39 :
40 : #if defined RBUS_DEBUG
41 : #define STATIC
42 : #define DPRINTF(a) printf a
43 : #else
44 : #ifdef DDB
45 : #define STATIC
46 : #else
47 : #define STATIC static
48 : #endif
49 : #define DPRINTF(a)
50 : #endif
51 :
52 :
53 : int
54 0 : rbus_space_alloc(rbus_tag_t rbt, bus_addr_t addr, bus_size_t size,
55 : bus_addr_t mask, bus_addr_t align, int flags, bus_addr_t *addrp,
56 : bus_space_handle_t *bshp)
57 : {
58 0 : return (rbus_space_alloc_subregion(rbt, rbt->rb_start, rbt->rb_end,
59 : addr, size, mask, align, flags, addrp, bshp));
60 : }
61 :
62 : int
63 0 : rbus_space_alloc_subregion(rbus_tag_t rbt, bus_addr_t substart,
64 : bus_addr_t subend, bus_addr_t addr, bus_size_t size,
65 : bus_addr_t mask, bus_addr_t align, int flags, bus_addr_t *addrp,
66 : bus_space_handle_t *bshp)
67 : {
68 0 : bus_addr_t decodesize = mask + 1;
69 : bus_addr_t boundary, search_addr;
70 : int val;
71 0 : u_long result;
72 : int exflags = EX_FAST | EX_NOWAIT | EX_MALLOCOK;
73 :
74 : DPRINTF(("rbus_space_alloc: addr %lx, size %lx, mask %lx, align %lx\n",
75 : (u_long)addr, (u_long)size, (u_long)mask, (u_long)align));
76 :
77 0 : if (mask == 0) {
78 : /* FULL Decode */
79 : decodesize = 0;
80 0 : }
81 :
82 0 : if (rbt->rb_flags == RBUS_SPACE_SHARE ||
83 0 : rbt->rb_flags == RBUS_SPACE_DEDICATE) {
84 : /* rbt has its own sh_extent */
85 :
86 : /* sanity check: the subregion [substart, subend] should be
87 : smaller than the region included in sh_extent */
88 0 : if (substart < rbt->rb_ext->ex_start ||
89 0 : subend > rbt->rb_ext->ex_end) {
90 : DPRINTF(("rbus: out of range\n"));
91 0 : return (1);
92 : }
93 :
94 0 : if (decodesize == align) {
95 0 : if (extent_alloc_subregion(rbt->rb_ext, substart,
96 : subend, size, align, 0, 0, exflags, &result))
97 0 : return (1);
98 0 : } else if (decodesize == 0) {
99 : /* maybe, the register is overflowed. */
100 :
101 0 : if (extent_alloc_subregion(rbt->rb_ext, addr,
102 0 : addr + size, size, 1, 0, 0, exflags, &result))
103 0 : return (1);
104 : } else {
105 0 : boundary = decodesize > align ? decodesize : align;
106 :
107 0 : search_addr = (substart & ~(boundary - 1)) + addr;
108 :
109 0 : if (search_addr < substart)
110 0 : search_addr += boundary;
111 :
112 : val = 1;
113 0 : for (; search_addr + size <= subend;
114 0 : search_addr += boundary) {
115 0 : val = extent_alloc_subregion(
116 0 : rbt->rb_ext,search_addr,
117 : search_addr + size, size, align, 0, 0,
118 : exflags, &result);
119 : DPRINTF(("rbus: trying [%lx:%lx] %lx\n",
120 : (u_long)search_addr,
121 : (u_long)search_addr + size,
122 : (u_long)align));
123 0 : if (val == 0)
124 : break;
125 : }
126 :
127 0 : if (val != 0) {
128 : /* no space found */
129 : DPRINTF(("rbus: no space found\n"));
130 0 : return (1);
131 : }
132 : }
133 :
134 0 : if (md_space_map(rbt, result, size, flags, bshp)) {
135 : /* map failed */
136 0 : extent_free(rbt->rb_ext, result, size, exflags);
137 0 : return (1);
138 : }
139 :
140 0 : if (addrp != NULL)
141 0 : *addrp = result;
142 0 : return (0);
143 : } else {
144 : /* error!! */
145 : DPRINTF(("rbus: no rbus type\n"));
146 0 : return (1);
147 : }
148 0 : }
149 :
150 : int
151 0 : rbus_space_free(rbus_tag_t rbt, bus_space_handle_t bsh, bus_size_t size,
152 : bus_addr_t *addrp)
153 : {
154 : int exflags = EX_FAST | EX_NOWAIT;
155 0 : bus_addr_t addr;
156 : int status = 1;
157 :
158 0 : if (rbt->rb_flags == RBUS_SPACE_SHARE ||
159 0 : rbt->rb_flags == RBUS_SPACE_DEDICATE) {
160 0 : md_space_unmap(rbt, bsh, size, &addr);
161 :
162 0 : extent_free(rbt->rb_ext, addr, size, exflags);
163 :
164 : status = 0;
165 0 : } else {
166 : /* error. INVALID rbustag */
167 : status = 1;
168 : }
169 :
170 0 : if (addrp != NULL)
171 0 : *addrp = addr;
172 :
173 0 : return (status);
174 0 : }
175 :
176 : /*
177 : * rbus_tag_t
178 : * rbus_new_body(bus_space_tag_t bt,
179 : * struct extent *ex, bus_addr_t start, bus_size_t end,
180 : * int flags)
181 : *
182 : */
183 : rbus_tag_t
184 0 : rbus_new_body(bus_space_tag_t bt, struct extent *ex,
185 : bus_addr_t start, bus_addr_t end, int flags)
186 : {
187 : rbus_tag_t rb;
188 :
189 0 : if ((rb = (rbus_tag_t)malloc(sizeof(struct rbustag), M_DEVBUF,
190 0 : M_NOWAIT)) == NULL) {
191 0 : panic("no memory for rbus instance");
192 : }
193 :
194 0 : rb->rb_bt = bt;
195 0 : rb->rb_start = start;
196 0 : rb->rb_end = end;
197 0 : rb->rb_flags = flags;
198 0 : rb->rb_ext = ex;
199 :
200 : DPRINTF(("rbus_new_body: [%lx, %lx] type %s name [%s]\n",
201 : (u_long)start, (u_long)end,
202 : flags == RBUS_SPACE_SHARE ? "share" :
203 : flags == RBUS_SPACE_DEDICATE ? "dedicated" : "invalid",
204 : ex != NULL ? ex->ex_name : "noname"));
205 :
206 0 : return (rb);
207 : }
208 :
209 : /*
210 : * rbus_tag_t rbus_new_root_delegate(bus_space_tag, bus_addr_t,
211 : * bus_size_t)
212 : *
213 : * This function makes a root rbus instance.
214 : */
215 : rbus_tag_t
216 0 : rbus_new_root_delegate(bus_space_tag_t bt, bus_addr_t start, bus_size_t size)
217 : {
218 : rbus_tag_t rb;
219 : struct extent *ex;
220 :
221 0 : if ((ex = extent_create("rbus root", start, start + size, M_DEVBUF,
222 0 : NULL, 0, EX_NOCOALESCE|EX_NOWAIT)) == NULL)
223 0 : return (NULL);
224 :
225 0 : rb = rbus_new_body(bt, ex, start, start + size,
226 : RBUS_SPACE_DEDICATE);
227 :
228 0 : if (rb == NULL)
229 0 : extent_destroy(ex);
230 :
231 0 : return (rb);
232 0 : }
233 :
234 : /*
235 : * rbus_tag_t rbus_new_root_share(bus_space_tag, struct extent *,
236 : * bus_addr_t, bus_size_t)
237 : *
238 : * This function makes a root rbus instance.
239 : */
240 : rbus_tag_t
241 0 : rbus_new_root_share(bus_space_tag_t bt, struct extent *ex, bus_addr_t start,
242 : bus_size_t size)
243 : {
244 : /* sanity check */
245 0 : if (start < ex->ex_start || start + size > ex->ex_end) {
246 : /* out of range: [start, size] should be contained in
247 : * parent space
248 : */
249 0 : return (0);
250 : /* Should I invoke panic? */
251 : }
252 :
253 0 : return (rbus_new_body(bt, ex, start, start + size,
254 : RBUS_SPACE_SHARE));
255 0 : }
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