1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1999 Doug Rabson
5 * 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 AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/bus.h>
33 #include <sys/module.h>
34 #include <isa/isavar.h>
35 #include <isa/isa_common.h>
36 #include <machine/resource.h>
37
38 void
isa_hinted_child(device_t parent,const char * name,int unit)39 isa_hinted_child(device_t parent, const char *name, int unit)
40 {
41 device_t child;
42 int sensitive, start, count;
43 int order;
44
45 /* device-specific flag overrides any wildcard */
46 sensitive = 0;
47 if (resource_int_value(name, unit, "sensitive", &sensitive) != 0)
48 resource_int_value(name, -1, "sensitive", &sensitive);
49
50 if (sensitive)
51 order = ISA_ORDER_SENSITIVE;
52 else
53 order = ISA_ORDER_SPECULATIVE;
54
55 child = BUS_ADD_CHILD(parent, order, name, unit);
56 if (child == 0)
57 return;
58
59 start = 0;
60 count = 0;
61 resource_int_value(name, unit, "port", &start);
62 resource_int_value(name, unit, "portsize", &count);
63 if (start > 0 || count > 0)
64 bus_set_resource(child, SYS_RES_IOPORT, 0, start, count);
65
66 start = 0;
67 count = 0;
68 resource_int_value(name, unit, "maddr", &start);
69 resource_int_value(name, unit, "msize", &count);
70 if (start > 0 || count > 0)
71 bus_set_resource(child, SYS_RES_MEMORY, 0, start, count);
72
73 if (resource_int_value(name, unit, "irq", &start) == 0 && start > 0)
74 bus_set_resource(child, SYS_RES_IRQ, 0, start, 1);
75
76 if (resource_int_value(name, unit, "drq", &start) == 0 && start >= 0)
77 bus_set_resource(child, SYS_RES_DRQ, 0, start, 1);
78
79 if (resource_disabled(name, unit))
80 device_disable(child);
81
82 isa_set_configattr(child, (isa_get_configattr(child)|ISACFGATTR_HINTS));
83 }
84
85 static int
isa_match_resource_hint(device_t dev,int type,long value)86 isa_match_resource_hint(device_t dev, int type, long value)
87 {
88 struct isa_device* idev = DEVTOISA(dev);
89 struct resource_list *rl = &idev->id_resources;
90 struct resource_list_entry *rle;
91
92 STAILQ_FOREACH(rle, rl, link) {
93 if (rle->type != type)
94 continue;
95 if (rle->start <= value && rle->end >= value)
96 return (1);
97 }
98 return (0);
99 }
100
101 void
isa_hint_device_unit(device_t bus,device_t child,const char * name,int * unitp)102 isa_hint_device_unit(device_t bus, device_t child, const char *name, int *unitp)
103 {
104 const char *s;
105 long value;
106 int line, matches, unit;
107
108 line = 0;
109 for (;;) {
110 if (resource_find_dev(&line, name, &unit, "at", NULL) != 0)
111 break;
112
113 /* Must have an "at" for isa. */
114 resource_string_value(name, unit, "at", &s);
115 if (!(strcmp(s, device_get_nameunit(bus)) == 0 ||
116 strcmp(s, device_get_name(bus)) == 0))
117 continue;
118
119 /*
120 * Check for matching resources. We must have at
121 * least one match. Since I/O and memory resources
122 * cannot be shared, if we get a match on either of
123 * those, ignore any mismatches in IRQs or DRQs.
124 *
125 * XXX: We may want to revisit this to be more lenient
126 * and wire as long as it gets one match.
127 */
128 matches = 0;
129 if (resource_long_value(name, unit, "port", &value) == 0) {
130 /*
131 * Floppy drive controllers are notorious for
132 * having a wide variety of resources not all
133 * of which include the first port that is
134 * specified by the hint (typically 0x3f0)
135 * (see the comment above
136 * fdc_isa_alloc_resources() in fdc_isa.c).
137 * However, they do all seem to include port +
138 * 2 (e.g. 0x3f2) so for a floppy device, look
139 * for 'value + 2' in the port resources
140 * instead of the hint value.
141 */
142 if (strcmp(name, "fdc") == 0)
143 value += 2;
144 if (isa_match_resource_hint(child, SYS_RES_IOPORT,
145 value))
146 matches++;
147 else
148 continue;
149 }
150 if (resource_long_value(name, unit, "maddr", &value) == 0) {
151 if (isa_match_resource_hint(child, SYS_RES_MEMORY,
152 value))
153 matches++;
154 else
155 continue;
156 }
157 if (matches > 0)
158 goto matched;
159 if (resource_long_value(name, unit, "irq", &value) == 0) {
160 if (isa_match_resource_hint(child, SYS_RES_IRQ, value))
161 matches++;
162 else
163 continue;
164 }
165 if (resource_long_value(name, unit, "drq", &value) == 0) {
166 if (isa_match_resource_hint(child, SYS_RES_DRQ, value))
167 matches++;
168 else
169 continue;
170 }
171
172 matched:
173 if (matches > 0) {
174 /* We have a winner! */
175 *unitp = unit;
176 break;
177 }
178 }
179 }
180