1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/kernel.h>
35#include <sys/bus.h>
36#include <sys/module.h>
37#include <isa/isavar.h>
38#include <isa/isa_common.h>
39#include <machine/resource.h>
40
41void
42isa_hinted_child(device_t parent, const char *name, int unit)
43{
44	device_t	child;
45	int		sensitive, start, count;
46	int		order;
47
48	/* device-specific flag overrides any wildcard */
49	sensitive = 0;
50	if (resource_int_value(name, unit, "sensitive", &sensitive) != 0)
51		resource_int_value(name, -1, "sensitive", &sensitive);
52
53	if (sensitive)
54		order = ISA_ORDER_SENSITIVE;
55	else
56		order = ISA_ORDER_SPECULATIVE;
57
58	child = BUS_ADD_CHILD(parent, order, name, unit);
59	if (child == 0)
60		return;
61
62	start = 0;
63	count = 0;
64	resource_int_value(name, unit, "port", &start);
65	resource_int_value(name, unit, "portsize", &count);
66	if (start > 0 || count > 0)
67		bus_set_resource(child, SYS_RES_IOPORT, 0, start, count);
68
69	start = 0;
70	count = 0;
71	resource_int_value(name, unit, "maddr", &start);
72	resource_int_value(name, unit, "msize", &count);
73	if (start > 0 || count > 0)
74		bus_set_resource(child, SYS_RES_MEMORY, 0, start, count);
75
76	if (resource_int_value(name, unit, "irq", &start) == 0 && start > 0)
77		bus_set_resource(child, SYS_RES_IRQ, 0, start, 1);
78
79	if (resource_int_value(name, unit, "drq", &start) == 0 && start >= 0)
80		bus_set_resource(child, SYS_RES_DRQ, 0, start, 1);
81
82	if (resource_disabled(name, unit))
83		device_disable(child);
84
85	isa_set_configattr(child, (isa_get_configattr(child)|ISACFGATTR_HINTS));
86}
87
88static int
89isa_match_resource_hint(device_t dev, int type, long value)
90{
91	struct isa_device* idev = DEVTOISA(dev);
92	struct resource_list *rl = &idev->id_resources;
93	struct resource_list_entry *rle;
94
95	STAILQ_FOREACH(rle, rl, link) {
96		if (rle->type != type)
97			continue;
98		if (rle->start <= value && rle->end >= value)
99			return (1);
100	}
101	return (0);
102}
103
104void
105isa_hint_device_unit(device_t bus, device_t child, const char *name, int *unitp)
106{
107	const char *s;
108	long value;
109	int line, matches, unit;
110
111	line = 0;
112	for (;;) {
113		if (resource_find_dev(&line, name, &unit, "at", NULL) != 0)
114			break;
115
116		/* Must have an "at" for isa. */
117		resource_string_value(name, unit, "at", &s);
118		if (!(strcmp(s, device_get_nameunit(bus)) == 0 ||
119		    strcmp(s, device_get_name(bus)) == 0))
120			continue;
121
122		/*
123		 * Check for matching resources.  We must have at
124		 * least one match.  Since I/O and memory resources
125		 * cannot be shared, if we get a match on either of
126		 * those, ignore any mismatches in IRQs or DRQs.
127		 *
128		 * XXX: We may want to revisit this to be more lenient
129		 * and wire as long as it gets one match.
130		 */
131		matches = 0;
132		if (resource_long_value(name, unit, "port", &value) == 0) {
133			/*
134			 * Floppy drive controllers are notorious for
135			 * having a wide variety of resources not all
136			 * of which include the first port that is
137			 * specified by the hint (typically 0x3f0)
138			 * (see the comment above
139			 * fdc_isa_alloc_resources() in fdc_isa.c).
140			 * However, they do all seem to include port +
141			 * 2 (e.g. 0x3f2) so for a floppy device, look
142			 * for 'value + 2' in the port resources
143			 * instead of the hint value.
144			 */
145			if (strcmp(name, "fdc") == 0)
146				value += 2;
147			if (isa_match_resource_hint(child, SYS_RES_IOPORT,
148			    value))
149				matches++;
150			else
151				continue;
152		}
153		if (resource_long_value(name, unit, "maddr", &value) == 0) {
154			if (isa_match_resource_hint(child, SYS_RES_MEMORY,
155			    value))
156				matches++;
157			else
158				continue;
159		}
160		if (matches > 0)
161			goto matched;
162		if (resource_long_value(name, unit, "irq", &value) == 0) {
163			if (isa_match_resource_hint(child, SYS_RES_IRQ, value))
164				matches++;
165			else
166				continue;
167		}
168		if (resource_long_value(name, unit, "drq", &value) == 0) {
169			if (isa_match_resource_hint(child, SYS_RES_DRQ, value))
170				matches++;
171			else
172				continue;
173		}
174
175	matched:
176		if (matches > 0) {
177			/* We have a winner! */
178			*unitp = unit;
179			break;
180		}
181	}
182}
183