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
38void
39isa_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
85static int
86isa_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
101void
102isa_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