isa.c revision 52123 
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 * $FreeBSD: head/sys/i386/isa/isa.c 52123 1999-10-11 15:00:09Z peter $
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/bus.h>
61#include <sys/malloc.h>
62#include <machine/bus.h>
63
64#include <machine/resource.h>
65
66#include <isa/isavar.h>
67#include <isa/isa_common.h>
68
69void
70isa_init(void)
71{
72    isa_wrap_old_drivers();
73}
74
75/*
76 * This implementation simply passes the request up to the parent
77 * bus, which in our case is the special i386 nexus, substituting any
78 * configured values if the caller defaulted.  We can get away with
79 * this because there is no special mapping for ISA resources on an Intel
80 * platform.  When porting this code to another architecture, it may be
81 * necessary to interpose a mapping layer here.
82 */
83struct resource *
84isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
85		   u_long start, u_long end, u_long count, u_int flags)
86{
87	/*
88	 * Consider adding a resource definition. We allow rid 0-1 for
89	 * irq and drq, 0-3 for memory and 0-7 for ports which is
90	 * sufficient for isapnp.
91	 */
92	int passthrough = (device_get_parent(child) != bus);
93	int isdefault = (start == 0UL && end == ~0UL);
94	struct resource_list *rl;
95	struct resource_list_entry *rle;
96
97	if (!passthrough && !isdefault) {
98		rl = device_get_ivars(child);
99		rle = resource_list_find(rl, type, *rid);
100		if (!rle) {
101			if (*rid < 0)
102				return 0;
103			if (type == SYS_RES_IRQ && *rid >= ISA_NIRQ)
104				return 0;
105			if (type == SYS_RES_DRQ && *rid >= ISA_NDRQ)
106				return 0;
107			if (type != SYS_RES_MEMORY && *rid >= ISA_NMEM)
108				return 0;
109			if (type == SYS_RES_IOPORT && *rid >= ISA_NPORT)
110				return 0;
111			resource_list_add(rl, type, *rid, start, end, count);
112		}
113	}
114
115	return resource_list_alloc(bus, child, type, rid,
116				   start, end, count, flags);
117}
118
119int
120isa_release_resource(device_t bus, device_t child, int type, int rid,
121		     struct resource *r)
122{
123	return resource_list_release(bus, child, type, rid, r);
124}
125
126/*
127 * We can't use the bus_generic_* versions of these methods because those
128 * methods always pass the bus param as the requesting device, and we need
129 * to pass the child (the i386 nexus knows about this and is prepared to
130 * deal).
131 */
132int
133isa_setup_intr(device_t bus, device_t child, struct resource *r, int flags,
134	       void (*ihand)(void *), void *arg, void **cookiep)
135{
136	return (BUS_SETUP_INTR(device_get_parent(bus), child, r, flags,
137			       ihand, arg, cookiep));
138}
139
140int
141isa_teardown_intr(device_t bus, device_t child, struct resource *r,
142		  void *cookie)
143{
144	return (BUS_TEARDOWN_INTR(device_get_parent(bus), child, r, cookie));
145}
146