1 /*-
2 * Copyright (c) 2000 Nikolai Saoukh
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: src/sys/isa/orm.c,v 1.1.2.1 2001/06/19 05:48:29 imp Exp $
27 */
28
29 /*
30 * Driver to take care of holes in ISA I/O memory occupied
31 * by option rom(s)
32 */
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/socket.h>
38 #include <sys/module.h>
39 #include <sys/bus.h>
40 #include <sys/rman.h>
41
42 #include <bus/isa/isavar.h>
43 #include <bus/isa/pnpvar.h>
44
45 #define IOMEM_START 0x0a0000
46 #define IOMEM_STEP 0x000800
47 #define IOMEM_END 0x100000
48
49 #define ORM_ID 0x00004d3e
50
51 static struct isa_pnp_id orm_ids[] = {
52 { ORM_ID, NULL }, /* ORM0000 */
53 { 0, NULL },
54 };
55
56 #define MAX_ROMS 16
57
58 struct orm_softc {
59 int rnum;
60 int rid[MAX_ROMS];
61 struct resource *res[MAX_ROMS];
62 };
63
64 static int
orm_probe(device_t dev)65 orm_probe(device_t dev)
66 {
67 return (ISA_PNP_PROBE(device_get_parent(dev), dev, orm_ids));
68 }
69
70 static int
orm_attach(device_t dev)71 orm_attach(device_t dev)
72 {
73 return (0);
74 }
75
76 static int
orm_identify(driver_t * driver,device_t parent)77 orm_identify(driver_t* driver, device_t parent)
78 {
79 bus_space_handle_t bh;
80 bus_space_tag_t bt;
81 device_t child;
82 u_int32_t chunk = IOMEM_START;
83 struct resource *res;
84 int rid;
85 u_int32_t rom_size;
86 struct orm_softc *sc;
87 u_int8_t buf[3];
88
89 /*
90 * rescanning the isa bus, do nothing
91 */
92 if (device_get_state(parent) == DS_ATTACHED)
93 return (0);
94
95 /*
96 * Otherwise see if it exists
97 */
98 child = BUS_ADD_CHILD(parent, parent, ISA_ORDER_SENSITIVE, "orm", -1);
99 device_set_driver(child, driver);
100 isa_set_logicalid(child, ORM_ID);
101 isa_set_vendorid(child, ORM_ID);
102 sc = device_get_softc(child);
103 sc->rnum = 0;
104 while (chunk < IOMEM_END) {
105 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk,
106 IOMEM_STEP, -1);
107 rid = sc->rnum;
108 res = bus_alloc_resource_any(child, SYS_RES_MEMORY, &rid,
109 RF_ACTIVE);
110 if (res == NULL) {
111 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
112 chunk += IOMEM_STEP;
113 continue;
114 }
115 bt = rman_get_bustag(res);
116 bh = rman_get_bushandle(res);
117 bus_space_read_region_1(bt, bh, 0, buf, sizeof(buf));
118
119 /*
120 * We need to release and delete the resource since we're
121 * changing its size, or the rom isn't there. There
122 * is a checksum field in the ROM to prevent false
123 * positives. However, some common hardware (IBM thinkpads)
124 * neglects to put a valid checksum in the ROM, so we do
125 * not double check the checksum here. On the ISA bus
126 * areas that have no hardware read back as 0xff, so the
127 * tests to see if we have 0x55 followed by 0xaa are
128 * generally sufficient.
129 */
130 bus_release_resource(child, SYS_RES_MEMORY, rid, res);
131 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
132 if (buf[0] != 0x55 || buf[1] != 0xAA || (buf[2] & 0x03) != 0) {
133 chunk += IOMEM_STEP;
134 continue;
135 }
136 rom_size = buf[2] << 9;
137 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk,
138 rom_size, -1);
139 rid = sc->rnum;
140 res = bus_alloc_resource_any(child, SYS_RES_MEMORY, &rid, 0);
141 if (res == NULL) {
142 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
143 chunk += IOMEM_STEP;
144 continue;
145 }
146 sc->rid[sc->rnum] = rid;
147 sc->res[sc->rnum] = res;
148 sc->rnum++;
149 chunk += rom_size;
150 }
151
152 /*
153 * note: sc becomes invalid after we delete the child.
154 */
155 if (sc->rnum == 0) {
156 device_delete_child(parent, child);
157 return (ENXIO);
158 }
159 if (sc->rnum == 1)
160 device_set_desc(child, "ISA Option ROM");
161 else
162 device_set_desc(child, "ISA Option ROMs");
163 return (0);
164 }
165
166 static int
orm_detach(device_t dev)167 orm_detach(device_t dev)
168 {
169 int i;
170 struct orm_softc *sc = device_get_softc(dev);
171
172 for (i = 0; i < sc->rnum; i++)
173 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i],
174 sc->res[i]);
175 return (0);
176 }
177
178 static device_method_t orm_methods[] = {
179 /* Device interface */
180 DEVMETHOD(device_identify, orm_identify),
181 DEVMETHOD(device_probe, orm_probe),
182 DEVMETHOD(device_attach, orm_attach),
183 DEVMETHOD(device_detach, orm_detach),
184 DEVMETHOD_END
185 };
186
187 static driver_t orm_driver = {
188 "orm",
189 orm_methods,
190 sizeof (struct orm_softc)
191 };
192
193 static devclass_t orm_devclass;
194
195 DRIVER_MODULE(orm, isa, orm_driver, orm_devclass, NULL, NULL);
196