isa.c revision 139790 
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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/i386/isa/isa.c 139790 2005-01-06 22:18:23Z imp $");
29
30/*-
31 * Modifications for Intel architecture by Garrett A. Wollman.
32 * Copyright 1998 Massachusetts Institute of Technology
33 *
34 * Permission to use, copy, modify, and distribute this software and
35 * its documentation for any purpose and without fee is hereby
36 * granted, provided that both the above copyright notice and this
37 * permission notice appear in all copies, that both the above
38 * copyright notice and this permission notice appear in all
39 * supporting documentation, and that the name of M.I.T. not be used
40 * in advertising or publicity pertaining to distribution of the
41 * software without specific, written prior permission.  M.I.T. makes
42 * no representations about the suitability of this software for any
43 * purpose.  It is provided "as is" without express or implied
44 * warranty.
45 *
46 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
47 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
48 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
49 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
50 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
51 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
52 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
53 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
54 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
55 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
56 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57 * SUCH DAMAGE.
58 */
59
60#ifdef PC98
61#define __RMAN_RESOURCE_VISIBLE
62#endif
63#include <sys/param.h>
64#include <sys/bus.h>
65#include <sys/kernel.h>
66#include <sys/malloc.h>
67#include <sys/module.h>
68#include <machine/bus.h>
69#include <sys/rman.h>
70#ifdef PC98
71#include <sys/systm.h>
72#endif
73
74#include <machine/resource.h>
75
76#include <isa/isavar.h>
77#include <isa/isa_common.h>
78
79void
80isa_init(device_t dev)
81{
82}
83
84/*
85 * This implementation simply passes the request up to the parent
86 * bus, which in our case is the special i386 nexus, substituting any
87 * configured values if the caller defaulted.  We can get away with
88 * this because there is no special mapping for ISA resources on an Intel
89 * platform.  When porting this code to another architecture, it may be
90 * necessary to interpose a mapping layer here.
91 */
92struct resource *
93isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
94		   u_long start, u_long end, u_long count, u_int flags)
95{
96	/*
97	 * Consider adding a resource definition.
98	 */
99	int passthrough = (device_get_parent(child) != bus);
100	int isdefault = (start == 0UL && end == ~0UL);
101	struct isa_device* idev = DEVTOISA(child);
102	struct resource_list *rl = &idev->id_resources;
103	struct resource_list_entry *rle;
104
105	if (!passthrough && !isdefault) {
106		rle = resource_list_find(rl, type, *rid);
107		if (!rle) {
108			if (*rid < 0)
109				return 0;
110			switch (type) {
111			case SYS_RES_IRQ:
112				if (*rid >= ISA_NIRQ)
113					return 0;
114				break;
115			case SYS_RES_DRQ:
116				if (*rid >= ISA_NDRQ)
117					return 0;
118				break;
119			case SYS_RES_MEMORY:
120				if (*rid >= ISA_NMEM)
121					return 0;
122				break;
123			case SYS_RES_IOPORT:
124				if (*rid >= ISA_NPORT)
125					return 0;
126				break;
127			default:
128				return 0;
129			}
130			resource_list_add(rl, type, *rid, start, end, count);
131		}
132	}
133
134	return resource_list_alloc(rl, bus, child, type, rid,
135				   start, end, count, flags);
136}
137
138#ifdef PC98
139/*
140 * Indirection support.  The type of bus_space_handle_t is
141 * defined in sys/i386/include/bus_pc98.h.
142 */
143struct resource *
144isa_alloc_resourcev(device_t child, int type, int *rid,
145		    bus_addr_t *res, bus_size_t count, u_int flags)
146{
147	struct isa_device* idev = DEVTOISA(child);
148	struct resource_list *rl = &idev->id_resources;
149
150	device_t	bus = device_get_parent(child);
151	bus_addr_t	start;
152	bus_space_handle_t bh;
153	struct resource *re;
154	struct resource	**bsre;
155	int		i, j, k, linear_cnt, ressz, bsrid;
156
157	start = bus_get_resource_start(child, type, *rid);
158
159	linear_cnt = count;
160	ressz = 1;
161	for (i = 1; i < count; ++i) {
162		if (res[i] != res[i - 1] + 1) {
163			if (i < linear_cnt)
164				linear_cnt = i;
165			++ressz;
166		}
167	}
168
169	re = isa_alloc_resource(bus, child, type, rid,
170				start + res[0], start + res[linear_cnt - 1],
171				linear_cnt, flags);
172	if (re == NULL)
173		return NULL;
174
175	bsre = malloc(sizeof (struct resource *) * ressz, M_DEVBUF, M_NOWAIT);
176	if (bsre == NULL) {
177		resource_list_release(rl, bus, child, type, *rid, re);
178		return NULL;
179	}
180	bsre[0] = re;
181
182	for (i = linear_cnt, k = 1; i < count; i = j, k++) {
183		for (j = i + 1; j < count; j++) {
184			if (res[j] != res[j - 1] + 1)
185				break;
186		}
187		bsrid = *rid + k;
188		bsre[k] = isa_alloc_resource(bus, child, type, &bsrid,
189			start + res[i], start + res[j - 1], j - i, flags);
190		if (bsre[k] == NULL) {
191			for (k--; k >= 0; k--)
192				resource_list_release(rl, bus, child, type,
193						      *rid + k, bsre[k]);
194			free(bsre, M_DEVBUF);
195			return NULL;
196		}
197	}
198
199	bh = rman_get_bushandle(re);
200	bh->bsh_res = bsre;
201	bh->bsh_ressz = ressz;
202
203	return re;
204}
205
206int
207isa_load_resourcev(struct resource *re, bus_addr_t *res, bus_size_t count)
208{
209	bus_addr_t	start;
210	bus_space_handle_t bh;
211	int		i;
212
213	bh = rman_get_bushandle(re);
214	if (count > bh->bsh_maxiatsz) {
215		printf("isa_load_resourcev: map size too large\n");
216		return EINVAL;
217	}
218
219	start = rman_get_start(re);
220	for (i = 0; i < bh->bsh_maxiatsz; i++) {
221		if (i < count)
222			bh->bsh_iat[i] = start + res[i];
223		else
224			bh->bsh_iat[i] = start;
225	}
226
227	bh->bsh_iatsz = count;
228	bh->bsh_bam = rman_get_bustag(re)->bs_ra;	/* relocate access */
229
230	return 0;
231}
232#endif	/* PC98 */
233
234int
235isa_release_resource(device_t bus, device_t child, int type, int rid,
236		     struct resource *r)
237{
238	struct isa_device* idev = DEVTOISA(child);
239	struct resource_list *rl = &idev->id_resources;
240#ifdef PC98
241	/*
242	 * Indirection support.  The type of bus_space_handle_t is
243	 * defined in sys/i386/include/bus_pc98.h.
244	 */
245	int	i;
246	bus_space_handle_t bh;
247
248	if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
249		bh = rman_get_bushandle(r);
250		for (i = 1; i < bh->bsh_ressz; i++)
251			resource_list_release(rl, bus, child, type, rid + i,
252					      bh->bsh_res[i]);
253		if (bh->bsh_res != NULL)
254			free(bh->bsh_res, M_DEVBUF);
255	}
256#endif
257	return resource_list_release(rl, bus, child, type, rid, r);
258}
259
260/*
261 * We can't use the bus_generic_* versions of these methods because those
262 * methods always pass the bus param as the requesting device, and we need
263 * to pass the child (the i386 nexus knows about this and is prepared to
264 * deal).
265 */
266int
267isa_setup_intr(device_t bus, device_t child, struct resource *r, int flags,
268	       void (*ihand)(void *), void *arg, void **cookiep)
269{
270	return (BUS_SETUP_INTR(device_get_parent(bus), child, r, flags,
271			       ihand, arg, cookiep));
272}
273
274int
275isa_teardown_intr(device_t bus, device_t child, struct resource *r,
276		  void *cookie)
277{
278	return (BUS_TEARDOWN_INTR(device_get_parent(bus), child, r, cookie));
279}
280
281/*
282 * On this platform, isa can also attach to the legacy bus.
283 */
284DRIVER_MODULE(isa, legacy, isa_driver, isa_devclass, 0, 0);
285