FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/isa.c
1 /*-
2 * Copyright (c) 1998 Doug Rabson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/8.0/sys/i386/isa/isa.c 182836 2008-09-07 04:44:24Z nyan $");
29
30 /*-
31 * Modifications for Intel architecture by Garrett A. Wollman.
32 * Copyright 1998 Massachusetts Institute of Technology
33 *
34 * Permission to use, copy, modify, and distribute this software and
35 * its documentation for any purpose and without fee is hereby
36 * granted, provided that both the above copyright notice and this
37 * permission notice appear in all copies, that both the above
38 * copyright notice and this permission notice appear in all
39 * supporting documentation, and that the name of M.I.T. not be used
40 * in advertising or publicity pertaining to distribution of the
41 * software without specific, written prior permission. M.I.T. makes
42 * no representations about the suitability of this software for any
43 * purpose. It is provided "as is" without express or implied
44 * warranty.
45 *
46 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
47 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
48 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
49 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
50 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
51 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
52 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
53 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
54 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
55 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
56 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57 * SUCH DAMAGE.
58 */
59
60 #include <sys/param.h>
61 #include <sys/bus.h>
62 #include <sys/kernel.h>
63 #include <sys/malloc.h>
64 #include <sys/module.h>
65 #include <machine/bus.h>
66 #include <sys/rman.h>
67 #ifdef PC98
68 #include <sys/systm.h>
69 #endif
70
71 #include <machine/resource.h>
72
73 #include <isa/isavar.h>
74 #include <isa/isa_common.h>
75
76 void
77 isa_init(device_t dev)
78 {
79 }
80
81 /*
82 * This implementation simply passes the request up to the parent
83 * bus, which in our case is the special i386 nexus, substituting any
84 * configured values if the caller defaulted. We can get away with
85 * this because there is no special mapping for ISA resources on an Intel
86 * platform. When porting this code to another architecture, it may be
87 * necessary to interpose a mapping layer here.
88 */
89 struct resource *
90 isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
91 u_long start, u_long end, u_long count, u_int flags)
92 {
93 /*
94 * Consider adding a resource definition.
95 */
96 int passthrough = (device_get_parent(child) != bus);
97 int isdefault = (start == 0UL && end == ~0UL);
98 struct isa_device* idev = DEVTOISA(child);
99 struct resource_list *rl = &idev->id_resources;
100 struct resource_list_entry *rle;
101
102 if (!passthrough && !isdefault) {
103 rle = resource_list_find(rl, type, *rid);
104 if (!rle) {
105 if (*rid < 0)
106 return 0;
107 switch (type) {
108 case SYS_RES_IRQ:
109 if (*rid >= ISA_NIRQ)
110 return 0;
111 break;
112 case SYS_RES_DRQ:
113 if (*rid >= ISA_NDRQ)
114 return 0;
115 break;
116 case SYS_RES_MEMORY:
117 if (*rid >= ISA_NMEM)
118 return 0;
119 break;
120 case SYS_RES_IOPORT:
121 if (*rid >= ISA_NPORT)
122 return 0;
123 break;
124 default:
125 return 0;
126 }
127 resource_list_add(rl, type, *rid, start, end, count);
128 }
129 }
130
131 return resource_list_alloc(rl, bus, child, type, rid,
132 start, end, count, flags);
133 }
134
135 #ifdef PC98
136 /*
137 * Indirection support. The type of bus_space_handle_t is
138 * defined in sys/i386/include/bus_pc98.h.
139 */
140 struct resource *
141 isa_alloc_resourcev(device_t child, int type, int *rid,
142 bus_addr_t *res, bus_size_t count, u_int flags)
143 {
144 struct isa_device* idev = DEVTOISA(child);
145 struct resource_list *rl = &idev->id_resources;
146
147 device_t bus = device_get_parent(child);
148 bus_addr_t start;
149 bus_space_handle_t bh;
150 struct resource *re;
151 struct resource **bsre;
152 int i, j, k, linear_cnt, ressz, bsrid;
153
154 start = bus_get_resource_start(child, type, *rid);
155
156 linear_cnt = count;
157 ressz = 1;
158 for (i = 1; i < count; ++i) {
159 if (res[i] != res[i - 1] + 1) {
160 if (i < linear_cnt)
161 linear_cnt = i;
162 ++ressz;
163 }
164 }
165
166 re = isa_alloc_resource(bus, child, type, rid,
167 start + res[0], start + res[linear_cnt - 1],
168 linear_cnt, flags);
169 if (re == NULL)
170 return NULL;
171
172 bsre = malloc(sizeof (struct resource *) * ressz, M_DEVBUF, M_NOWAIT);
173 if (bsre == NULL) {
174 resource_list_release(rl, bus, child, type, *rid, re);
175 return NULL;
176 }
177 bsre[0] = re;
178
179 for (i = linear_cnt, k = 1; i < count; i = j, k++) {
180 for (j = i + 1; j < count; j++) {
181 if (res[j] != res[j - 1] + 1)
182 break;
183 }
184 bsrid = *rid + k;
185 bsre[k] = isa_alloc_resource(bus, child, type, &bsrid,
186 start + res[i], start + res[j - 1], j - i, flags);
187 if (bsre[k] == NULL) {
188 for (k--; k >= 0; k--)
189 resource_list_release(rl, bus, child, type,
190 *rid + k, bsre[k]);
191 free(bsre, M_DEVBUF);
192 return NULL;
193 }
194 }
195
196 bh = rman_get_bushandle(re);
197 bh->bsh_res = bsre;
198 bh->bsh_ressz = ressz;
199
200 return re;
201 }
202
203 int
204 isa_load_resourcev(struct resource *re, bus_addr_t *res, bus_size_t count)
205 {
206
207 return bus_space_map_load(rman_get_bustag(re), rman_get_bushandle(re),
208 count, res, 0);
209 }
210 #endif /* PC98 */
211
212 int
213 isa_release_resource(device_t bus, device_t child, int type, int rid,
214 struct resource *r)
215 {
216 struct isa_device* idev = DEVTOISA(child);
217 struct resource_list *rl = &idev->id_resources;
218 #ifdef PC98
219 /*
220 * Indirection support. The type of bus_space_handle_t is
221 * defined in sys/i386/include/bus_pc98.h.
222 */
223 int i;
224 bus_space_handle_t bh;
225
226 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
227 bh = rman_get_bushandle(r);
228 if (bh != NULL) {
229 for (i = 1; i < bh->bsh_ressz; i++)
230 resource_list_release(rl, bus, child, type,
231 rid + i, bh->bsh_res[i]);
232 if (bh->bsh_res != NULL)
233 free(bh->bsh_res, M_DEVBUF);
234 }
235 }
236 #endif
237 return resource_list_release(rl, bus, child, type, rid, r);
238 }
239
240 /*
241 * We can't use the bus_generic_* versions of these methods because those
242 * methods always pass the bus param as the requesting device, and we need
243 * to pass the child (the i386 nexus knows about this and is prepared to
244 * deal).
245 */
246 int
247 isa_setup_intr(device_t bus, device_t child, struct resource *r, int flags,
248 driver_filter_t filter, void (*ihand)(void *), void *arg,
249 void **cookiep)
250 {
251 return (BUS_SETUP_INTR(device_get_parent(bus), child, r, flags,
252 filter, ihand, arg, cookiep));
253 }
254
255 int
256 isa_teardown_intr(device_t bus, device_t child, struct resource *r,
257 void *cookie)
258 {
259 return (BUS_TEARDOWN_INTR(device_get_parent(bus), child, r, cookie));
260 }
261
262 /*
263 * On this platform, isa can also attach to the legacy bus.
264 */
265 DRIVER_MODULE(isa, legacy, isa_driver, isa_devclass, 0, 0);
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