isa.c revision 115703 
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 115703 2003-06-02 16:32:55Z obrien $");
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#include <sys/param.h>
61#include <sys/bus.h>
62#include <sys/malloc.h>
63#include <machine/bus.h>
64#include <sys/rman.h>
65#ifdef PC98
66#include <sys/systm.h>
67#endif
68
69#include <machine/resource.h>
70
71#include <isa/isavar.h>
72#include <isa/isa_common.h>
73
74void
75isa_init(device_t dev)
76{
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
135#ifdef PC98
136/*
137 * Indirection support.  The type of bus_space_handle_t is
138 * defined in sys/i386/include/bus_pc98.h.
139 */
140struct resource *
141isa_alloc_resourcev(device_t child, int type, int *rid,
142		    bus_addr_t *res, bus_size_t count, u_int flags)
143{
144	struct isa_device* idev = DEVTOISA(child);
145	struct resource_list *rl = &idev->id_resources;
146
147	device_t	bus = device_get_parent(child);
148	bus_addr_t	start;
149	struct resource *re;
150	struct resource	**bsre;
151	int		i, j, k, linear_cnt, ressz, bsrid;
152
153	start = bus_get_resource_start(child, type, *rid);
154
155	linear_cnt = count;
156	ressz = 1;
157	for (i = 1; i < count; ++i) {
158		if (res[i] != res[i - 1] + 1) {
159			if (i < linear_cnt)
160				linear_cnt = i;
161			++ressz;
162		}
163	}
164
165	re = isa_alloc_resource(bus, child, type, rid,
166				start + res[0], start + res[linear_cnt - 1],
167				linear_cnt, flags);
168	if (re == NULL)
169		return NULL;
170
171	bsre = malloc(sizeof (struct resource *) * ressz, M_DEVBUF, M_NOWAIT);
172	if (bsre == NULL) {
173		resource_list_release(rl, bus, child, type, *rid, re);
174		return NULL;
175	}
176	bsre[0] = re;
177
178	for (i = linear_cnt, k = 1; i < count; i = j, k++) {
179		for (j = i + 1; j < count; j++) {
180			if (res[j] != res[j - 1] + 1)
181				break;
182		}
183		bsrid = *rid + k;
184		bsre[k] = isa_alloc_resource(bus, child, type, &bsrid,
185			start + res[i], start + res[j - 1], j - i, flags);
186		if (bsre[k] == NULL) {
187			for (k--; k >= 0; k--)
188				resource_list_release(rl, bus, child, type,
189						      *rid + k, bsre[k]);
190			free(bsre, M_DEVBUF);
191			return NULL;
192		}
193	}
194
195	re->r_bushandle->bsh_res = bsre;
196	re->r_bushandle->bsh_ressz = ressz;
197
198	return re;
199}
200
201int
202isa_load_resourcev(struct resource *re, bus_addr_t *res, bus_size_t count)
203{
204	bus_addr_t	start;
205	int		i;
206
207	if (count > re->r_bushandle->bsh_maxiatsz) {
208		printf("isa_load_resourcev: map size too large\n");
209		return EINVAL;
210	}
211
212	start = rman_get_start(re);
213	for (i = 0; i < re->r_bushandle->bsh_maxiatsz; i++) {
214		if (i < count)
215			re->r_bushandle->bsh_iat[i] = start + res[i];
216		else
217			re->r_bushandle->bsh_iat[i] = start;
218	}
219
220	re->r_bushandle->bsh_iatsz = count;
221	re->r_bushandle->bsh_bam = re->r_bustag->bs_ra;	/* relocate access */
222
223	return 0;
224}
225#endif	/* PC98 */
226
227int
228isa_release_resource(device_t bus, device_t child, int type, int rid,
229		     struct resource *r)
230{
231	struct isa_device* idev = DEVTOISA(child);
232	struct resource_list *rl = &idev->id_resources;
233#ifdef PC98
234	/*
235	 * Indirection support.  The type of bus_space_handle_t is
236	 * defined in sys/i386/include/bus_pc98.h.
237	 */
238	int	i;
239
240	if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
241		for (i = 1; i < r->r_bushandle->bsh_ressz; i++)
242			resource_list_release(rl, bus, child, type, rid + i,
243					      r->r_bushandle->bsh_res[i]);
244		if (r->r_bushandle->bsh_res != NULL)
245			free(r->r_bushandle->bsh_res, M_DEVBUF);
246	}
247#endif
248	return resource_list_release(rl, bus, child, type, rid, r);
249}
250
251/*
252 * We can't use the bus_generic_* versions of these methods because those
253 * methods always pass the bus param as the requesting device, and we need
254 * to pass the child (the i386 nexus knows about this and is prepared to
255 * deal).
256 */
257int
258isa_setup_intr(device_t bus, device_t child, struct resource *r, int flags,
259	       void (*ihand)(void *), void *arg, void **cookiep)
260{
261	return (BUS_SETUP_INTR(device_get_parent(bus), child, r, flags,
262			       ihand, arg, cookiep));
263}
264
265int
266isa_teardown_intr(device_t bus, device_t child, struct resource *r,
267		  void *cookie)
268{
269	return (BUS_TEARDOWN_INTR(device_get_parent(bus), child, r, cookie));
270}
271