FreeBSD/Linux Kernel Cross Reference
sys/x86/isa/orm.c
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2000 Nikolai Saoukh
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 /*
33 * Driver to take care of holes in ISA I/O memory occupied
34 * by option rom(s)
35 */
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/socket.h>
41
42 #include <sys/module.h>
43 #include <sys/bus.h>
44
45 #include <machine/bus.h>
46 #include <machine/resource.h>
47 #include <sys/rman.h>
48
49 #include <isa/isavar.h>
50 #include <isa/pnpvar.h>
51
52 #define IOMEM_START 0x0a0000
53 #define IOMEM_STEP 0x000800
54 #define IOMEM_END 0x100000
55
56 #define ORM_ID 0x00004d3e
57
58 static struct isa_pnp_id orm_ids[] = {
59 { ORM_ID, NULL }, /* ORM0000 */
60 { 0, NULL },
61 };
62
63 #define MAX_ROMS 32
64
65 struct orm_softc {
66 int rnum;
67 int rid[MAX_ROMS];
68 struct resource *res[MAX_ROMS];
69 };
70
71 static int
72 orm_probe(device_t dev)
73 {
74 return (ISA_PNP_PROBE(device_get_parent(dev), dev, orm_ids));
75 }
76
77 static int
78 orm_attach(device_t dev)
79 {
80 return (0);
81 }
82
83 static void
84 orm_identify(driver_t* driver, device_t parent)
85 {
86 bus_space_handle_t bh;
87 bus_space_tag_t bt;
88 device_t child;
89 u_int32_t chunk = IOMEM_START;
90 struct resource *res;
91 int rid;
92 u_int32_t rom_size;
93 struct orm_softc *sc;
94 u_int8_t buf[3];
95
96 if (resource_disabled("orm", 0))
97 return;
98
99 child = BUS_ADD_CHILD(parent, ISA_ORDER_SENSITIVE, "orm", -1);
100 device_set_driver(child, driver);
101 isa_set_logicalid(child, ORM_ID);
102 isa_set_vendorid(child, ORM_ID);
103 sc = device_get_softc(child);
104 sc->rnum = 0;
105 while (sc->rnum < MAX_ROMS && chunk < IOMEM_END) {
106 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk,
107 IOMEM_STEP);
108 rid = sc->rnum;
109 res = bus_alloc_resource_any(child, SYS_RES_MEMORY, &rid,
110 RF_ACTIVE);
111 if (res == NULL) {
112 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
113 chunk += IOMEM_STEP;
114 continue;
115 }
116 bt = rman_get_bustag(res);
117 bh = rman_get_bushandle(res);
118 bus_space_read_region_1(bt, bh, 0, buf, sizeof(buf));
119
120 /*
121 * We need to release and delete the resource since we're
122 * changing its size, or the rom isn't there. There
123 * is a checksum field in the ROM to prevent false
124 * positives. However, some common hardware (IBM thinkpads)
125 * neglects to put a valid checksum in the ROM, so we do
126 * not double check the checksum here. On the ISA bus
127 * areas that have no hardware read back as 0xff, so the
128 * tests to see if we have 0x55 followed by 0xaa are
129 * generally sufficient.
130 */
131 bus_release_resource(child, SYS_RES_MEMORY, rid, res);
132 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
133 if (buf[0] != 0x55 || buf[1] != 0xAA || (buf[2] & 0x03) != 0) {
134 chunk += IOMEM_STEP;
135 continue;
136 }
137 rom_size = buf[2] << 9;
138 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk,
139 rom_size);
140 rid = sc->rnum;
141 res = bus_alloc_resource_any(child, SYS_RES_MEMORY, &rid, 0);
142 if (res == NULL) {
143 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
144 chunk += IOMEM_STEP;
145 continue;
146 }
147 sc->rid[sc->rnum] = rid;
148 sc->res[sc->rnum] = res;
149 sc->rnum++;
150 chunk += rom_size;
151 }
152
153 if (sc->rnum == 0)
154 device_delete_child(parent, child);
155 else if (sc->rnum == 1)
156 device_set_desc(child, "ISA Option ROM");
157 else
158 device_set_desc(child, "ISA Option ROMs");
159 }
160
161 static int
162 orm_detach(device_t dev)
163 {
164 int i;
165 struct orm_softc *sc = device_get_softc(dev);
166
167 for (i = 0; i < sc->rnum; i++)
168 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i],
169 sc->res[i]);
170 return (0);
171 }
172
173 static device_method_t orm_methods[] = {
174 /* Device interface */
175 DEVMETHOD(device_identify, orm_identify),
176 DEVMETHOD(device_probe, orm_probe),
177 DEVMETHOD(device_attach, orm_attach),
178 DEVMETHOD(device_detach, orm_detach),
179 { 0, 0 }
180 };
181
182 static driver_t orm_driver = {
183 "orm",
184 orm_methods,
185 sizeof (struct orm_softc)
186 };
187
188 static devclass_t orm_devclass;
189
190 DRIVER_MODULE(orm, isa, orm_driver, orm_devclass, 0, 0);
191 ISA_PNP_INFO(orm_ids);
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