summaryrefslogtreecommitdiffstats
path: root/sys/isa/isahint.c
blob: 5eccef85949db00ca3caad2b51b3d03265839cec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/*-
 * Copyright (c) 1999 Doug Rabson
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/module.h>
#include <isa/isavar.h>
#include <isa/isa_common.h>
#include <machine/resource.h>

void
isa_hinted_child(device_t parent, const char *name, int unit)
{
	device_t	child;
	int		sensitive, start, count;
	int		order;

	/* device-specific flag overrides any wildcard */
	sensitive = 0;
	if (resource_int_value(name, unit, "sensitive", &sensitive) != 0)
		resource_int_value(name, -1, "sensitive", &sensitive);

	if (sensitive)
		order = ISA_ORDER_SENSITIVE;
	else
		order = ISA_ORDER_SPECULATIVE;

	child = BUS_ADD_CHILD(parent, order, name, unit);
	if (child == 0)
		return;

	start = 0;
	count = 0;
	resource_int_value(name, unit, "port", &start);
	resource_int_value(name, unit, "portsize", &count);
	if (start > 0 || count > 0)
		bus_set_resource(child, SYS_RES_IOPORT, 0, start, count);

	start = 0;
	count = 0;
	resource_int_value(name, unit, "maddr", &start);
	resource_int_value(name, unit, "msize", &count);
	if (start > 0 || count > 0)
		bus_set_resource(child, SYS_RES_MEMORY, 0, start, count);

	if (resource_int_value(name, unit, "irq", &start) == 0 && start > 0)
		bus_set_resource(child, SYS_RES_IRQ, 0, start, 1);

	if (resource_int_value(name, unit, "drq", &start) == 0 && start >= 0)
		bus_set_resource(child, SYS_RES_DRQ, 0, start, 1);

	if (resource_disabled(name, unit))
		device_disable(child);

	isa_set_configattr(child, (isa_get_configattr(child)|ISACFGATTR_HINTS));
}

static int
isa_match_resource_hint(device_t dev, int type, long value)
{
	struct isa_device* idev = DEVTOISA(dev);
	struct resource_list *rl = &idev->id_resources;
	struct resource_list_entry *rle;

	STAILQ_FOREACH(rle, rl, link) {
		if (rle->type != type)
			continue;
		if (rle->start <= value && rle->end >= value)
			return (1);
	}
	return (0);
}

void
isa_hint_device_unit(device_t bus, device_t child, const char *name, int *unitp)
{
	const char *s;
	long value;
	int line, matches, unit;

	line = 0;
	for (;;) {
		if (resource_find_dev(&line, name, &unit, "at", NULL) != 0)
			break;

		/* Must have an "at" for isa. */
		resource_string_value(name, unit, "at", &s);
		if (!(strcmp(s, device_get_nameunit(bus)) == 0 ||
		    strcmp(s, device_get_name(bus)) == 0))
			continue;

		/*
		 * Check for matching resources.  We must have at
		 * least one match.  Since I/O and memory resources
		 * cannot be shared, if we get a match on either of
		 * those, ignore any mismatches in IRQs or DRQs.
		 *
		 * XXX: We may want to revisit this to be more lenient
		 * and wire as long as it gets one match.
		 */
		matches = 0;
		if (resource_long_value(name, unit, "port", &value) == 0) {
			/*
			 * Floppy drive controllers are notorious for
			 * having a wide variety of resources not all
			 * of which include the first port that is
			 * specified by the hint (typically 0x3f0)
			 * (see the comment above
			 * fdc_isa_alloc_resources() in fdc_isa.c).
			 * However, they do all seem to include port +
			 * 2 (e.g. 0x3f2) so for a floppy device, look
			 * for 'value + 2' in the port resources
			 * instead of the hint value.
			 */
			if (strcmp(name, "fdc") == 0)
				value += 2;
			if (isa_match_resource_hint(child, SYS_RES_IOPORT,
			    value))
				matches++;
			else
				continue;
		}
		if (resource_long_value(name, unit, "maddr", &value) == 0) {
			if (isa_match_resource_hint(child, SYS_RES_MEMORY,
			    value))
				matches++;
			else
				continue;
		}
		if (matches > 0)
			goto matched;
		if (resource_long_value(name, unit, "irq", &value) == 0) {
			if (isa_match_resource_hint(child, SYS_RES_IRQ, value))
				matches++;
			else
				continue;
		}
		if (resource_long_value(name, unit, "drq", &value) == 0) {
			if (isa_match_resource_hint(child, SYS_RES_DRQ, value))
				matches++;
			else
				continue;
		}

	matched:
		if (matches > 0) {
			/* We have a winner! */
			*unitp = unit;
			break;
		}
	}
}
OpenPOWER on IntegriCloud