isa.c revision 47616 
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 *	$Id: isa.c,v 1.127 1999/05/22 15:18:12 dfr Exp $
27 */
28
29/*
30 * Modifications for Intel architecture by Garrett A. Wollman.
31 * Copyright 1998 Massachusetts Institute of Technology
32 *
33 * Permission to use, copy, modify, and distribute this software and
34 * its documentation for any purpose and without fee is hereby
35 * granted, provided that both the above copyright notice and this
36 * permission notice appear in all copies, that both the above
37 * copyright notice and this permission notice appear in all
38 * supporting documentation, and that the name of M.I.T. not be used
39 * in advertising or publicity pertaining to distribution of the
40 * software without specific, written prior permission.  M.I.T. makes
41 * no representations about the suitability of this software for any
42 * purpose.  It is provided "as is" without express or implied
43 * warranty.
44 *
45 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
46 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
47 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
48 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
49 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
50 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
51 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
52 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
53 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
54 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
55 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56 * SUCH DAMAGE.
57 */
58
59#include <sys/param.h>
60#include <sys/systm.h>
61#include <sys/kernel.h>
62#include <sys/bus.h>
63#include <sys/malloc.h>
64#include <sys/module.h>
65#include <machine/bus.h>
66#include <sys/rman.h>
67
68#include <machine/resource.h>
69
70#include <isa/isavar.h>
71#include <isa/isa_common.h>
72
73void
74isa_init(void)
75{
76    isa_wrap_old_drivers();
77}
78
79/*
80 * This implementation simply passes the request up to the parent
81 * bus, which in our case is the special i386 nexus, substituting any
82 * configured values if the caller defaulted.  We can get away with
83 * this because there is no special mapping for ISA resources on an Intel
84 * platform.  When porting this code to another architecture, it may be
85 * necessary to interpose a mapping layer here.
86 */
87struct resource *
88isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
89		   u_long start, u_long end, u_long count, u_int flags)
90{
91	/*
92	 * Consider adding a resource definition. We allow rid 0-1 for
93	 * irq and drq, 0-3 for memory and 0-7 for ports which is
94	 * sufficient for isapnp.
95	 */
96	int passthrough = (device_get_parent(child) != bus);
97	int isdefault = (start == 0UL && end == ~0UL);
98	struct resource_list *rl;
99	struct resource_list_entry *rle;
100
101	if (!passthrough && !isdefault) {
102		rl = device_get_ivars(child);
103		rle = resource_list_find(rl, type, *rid);
104		if (!rle) {
105			if (*rid < 0)
106				return 0;
107			if (type == SYS_RES_IRQ && *rid > 1)
108				return 0;
109			if (type == SYS_RES_DRQ && *rid > 1)
110				return 0;
111			if (type != SYS_RES_MEMORY && *rid > 3)
112				return 0;
113			if (type == SYS_RES_IOPORT && *rid > 7)
114				return 0;
115			resource_list_add(rl, type, *rid, start, end, count);
116		}
117	}
118
119	return resource_list_alloc(bus, child, type, rid,
120				   start, end, count, flags);
121}
122
123int
124isa_release_resource(device_t bus, device_t child, int type, int rid,
125		     struct resource *r)
126{
127	return resource_list_release(bus, child, type, rid, r);
128}
129
130/*
131 * We can't use the bus_generic_* versions of these methods because those
132 * methods always pass the bus param as the requesting device, and we need
133 * to pass the child (the i386 nexus knows about this and is prepared to
134 * deal).
135 */
136int
137isa_setup_intr(device_t bus, device_t child, struct resource *r, int flags,
138	       void (*ihand)(void *), void *arg, void **cookiep)
139{
140	return (BUS_SETUP_INTR(device_get_parent(bus), child, r, flags,
141			       ihand, arg, cookiep));
142}
143
144int
145isa_teardown_intr(device_t bus, device_t child, struct resource *r,
146		  void *cookie)
147{
148	return (BUS_TEARDOWN_INTR(device_get_parent(bus), child, r, cookie));
149}
150