isa.c revision 58287 
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 58287 2000-03-19 13:07:12Z 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 "opt_compat_oldisa.h"
60
61#include <sys/param.h>
62#include <sys/bus.h>
63#include <sys/malloc.h>
64#include <machine/bus.h>
65
66#include <machine/resource.h>
67
68#include <isa/isavar.h>
69#include <isa/isa_common.h>
70
71void
72isa_init(void)
73{
74#ifdef COMPAT_OLDISA
75	isa_wrap_old_drivers();
76#endif
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 isa_device* idev = DEVTOISA(child);
99	struct resource_list *rl = &idev->id_resources;
100	struct resource_list_entry *rle;
101
102	if (!passthrough && !isdefault) {
103		rle = resource_list_find(rl, type, *rid);
104		if (!rle) {
105			if (*rid < 0)
106				return 0;
107			switch (type) {
108			case SYS_RES_IRQ:
109				if (*rid >= ISA_NIRQ)
110					return 0;
111				break;
112			case SYS_RES_DRQ:
113				if (*rid >= ISA_NDRQ)
114					return 0;
115				break;
116			case SYS_RES_MEMORY:
117				if (*rid >= ISA_NMEM)
118					return 0;
119				break;
120			case SYS_RES_IOPORT:
121				if (*rid >= ISA_NPORT)
122					return 0;
123				break;
124			default:
125				return 0;
126			}
127			resource_list_add(rl, type, *rid, start, end, count);
128		}
129	}
130
131	return resource_list_alloc(rl, bus, child, type, rid,
132				   start, end, count, flags);
133}
134
135int
136isa_release_resource(device_t bus, device_t child, int type, int rid,
137		     struct resource *r)
138{
139	struct isa_device* idev = DEVTOISA(child);
140	struct resource_list *rl = &idev->id_resources;
141	return resource_list_release(rl, bus, child, type, rid, r);
142}
143
144/*
145 * We can't use the bus_generic_* versions of these methods because those
146 * methods always pass the bus param as the requesting device, and we need
147 * to pass the child (the i386 nexus knows about this and is prepared to
148 * deal).
149 */
150int
151isa_setup_intr(device_t bus, device_t child, struct resource *r, int flags,
152	       void (*ihand)(void *), void *arg, void **cookiep)
153{
154	return (BUS_SETUP_INTR(device_get_parent(bus), child, r, flags,
155			       ihand, arg, cookiep));
156}
157
158int
159isa_teardown_intr(device_t bus, device_t child, struct resource *r,
160		  void *cookie)
161{
162	return (BUS_TEARDOWN_INTR(device_get_parent(bus), child, r, cookie));
163}
164