xref: /freebsd/sys/x86/isa/isa.c (revision a0ee8cc6)
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("$FreeBSD$");
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/kernel.h>
63 #include <sys/malloc.h>
64 #include <sys/module.h>
65 #include <machine/bus.h>
66 #include <sys/rman.h>
67 #ifdef PC98
68 #include <sys/systm.h>
69 #endif
70 
71 #include <machine/resource.h>
72 
73 #include <isa/isavar.h>
74 #include <isa/isa_common.h>
75 
76 void
77 isa_init(device_t dev)
78 {
79 }
80 
81 /*
82  * This implementation simply passes the request up to the parent
83  * bus, which in our case is the special i386 nexus, substituting any
84  * configured values if the caller defaulted.  We can get away with
85  * this because there is no special mapping for ISA resources on an Intel
86  * platform.  When porting this code to another architecture, it may be
87  * necessary to interpose a mapping layer here.
88  */
89 struct resource *
90 isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
91 		   u_long start, u_long end, u_long count, u_int flags)
92 {
93 	/*
94 	 * Consider adding a resource definition.
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  */
140 struct resource *
141 isa_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 	bus_space_handle_t bh;
150 	struct resource *re;
151 	struct resource	**bsre;
152 	int		i, j, k, linear_cnt, ressz, bsrid;
153 
154 	start = bus_get_resource_start(child, type, *rid);
155 
156 	linear_cnt = count;
157 	ressz = 1;
158 	for (i = 1; i < count; ++i) {
159 		if (res[i] != res[i - 1] + 1) {
160 			if (i < linear_cnt)
161 				linear_cnt = i;
162 			++ressz;
163 		}
164 	}
165 
166 	re = isa_alloc_resource(bus, child, type, rid,
167 				start + res[0], start + res[linear_cnt - 1],
168 				linear_cnt, flags);
169 	if (re == NULL)
170 		return NULL;
171 
172 	bsre = malloc(sizeof (struct resource *) * ressz, M_DEVBUF, M_NOWAIT);
173 	if (bsre == NULL) {
174 		resource_list_release(rl, bus, child, type, *rid, re);
175 		return NULL;
176 	}
177 	bsre[0] = re;
178 
179 	for (i = linear_cnt, k = 1; i < count; i = j, k++) {
180 		for (j = i + 1; j < count; j++) {
181 			if (res[j] != res[j - 1] + 1)
182 				break;
183 		}
184 		bsrid = *rid + k;
185 		bsre[k] = isa_alloc_resource(bus, child, type, &bsrid,
186 			start + res[i], start + res[j - 1], j - i, flags);
187 		if (bsre[k] == NULL) {
188 			for (k--; k >= 0; k--)
189 				resource_list_release(rl, bus, child, type,
190 						      *rid + k, bsre[k]);
191 			free(bsre, M_DEVBUF);
192 			return NULL;
193 		}
194 	}
195 
196 	bh = rman_get_bushandle(re);
197 	bh->bsh_res = bsre;
198 	bh->bsh_ressz = ressz;
199 
200 	return re;
201 }
202 
203 int
204 isa_load_resourcev(struct resource *re, bus_addr_t *res, bus_size_t count)
205 {
206 
207 	return bus_space_map_load(rman_get_bustag(re), rman_get_bushandle(re),
208 				  count, res, 0);
209 }
210 #endif	/* PC98 */
211 
212 int
213 isa_release_resource(device_t bus, device_t child, int type, int rid,
214 		     struct resource *r)
215 {
216 	struct isa_device* idev = DEVTOISA(child);
217 	struct resource_list *rl = &idev->id_resources;
218 #ifdef PC98
219 	/*
220 	 * Indirection support.  The type of bus_space_handle_t is
221 	 * defined in sys/i386/include/bus_pc98.h.
222 	 */
223 	int	i;
224 	bus_space_handle_t bh;
225 
226 	if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
227 		bh = rman_get_bushandle(r);
228 		if (bh != NULL) {
229 			for (i = 1; i < bh->bsh_ressz; i++)
230 				resource_list_release(rl, bus, child, type,
231 						      rid + i, bh->bsh_res[i]);
232 			if (bh->bsh_res != NULL)
233 				free(bh->bsh_res, M_DEVBUF);
234 		}
235 	}
236 #endif
237 	return resource_list_release(rl, bus, child, type, rid, r);
238 }
239 
240 /*
241  * On this platform, isa can also attach to the legacy bus.
242  */
243 DRIVER_MODULE(isa, legacy, isa_driver, isa_devclass, 0, 0);
244 
245 /*
246  * Attach the ISA bus to the xenpv bus in order to get syscons.
247  */
248 DRIVER_MODULE(isa, xenpv, isa_driver, isa_devclass, 0, 0);
249