2 * Copyright (c) 2000 Nikolai Saoukh
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $FreeBSD: src/sys/isa/orm.c,v 1.1.2.1 2001/06/19 05:48:29 imp Exp $
27 * $DragonFly: src/sys/dev/misc/orm/orm.c,v 1.6 2006/10/25 20:55:54 dillon Exp $
31 * Driver to take care of holes in ISA I/O memory occupied
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/socket.h>
39 #include <sys/module.h>
43 #include <bus/isa/isavar.h>
44 #include <bus/isa/pnpvar.h>
46 #define IOMEM_START 0x0a0000
47 #define IOMEM_STEP 0x000800
48 #define IOMEM_END 0x100000
50 #define ORM_ID 0x00004d3e
52 static struct isa_pnp_id orm_ids[] = {
53 { ORM_ID, NULL }, /* ORM0000 */
62 struct resource *res[MAX_ROMS];
66 orm_probe(device_t dev)
68 return (ISA_PNP_PROBE(device_get_parent(dev), dev, orm_ids));
72 orm_attach(device_t dev)
78 orm_identify(driver_t* driver, device_t parent)
80 bus_space_handle_t bh;
83 u_int32_t chunk = IOMEM_START;
91 * rescanning the isa bus, do nothing
93 if (device_get_state(parent) == DS_ATTACHED)
97 * Otherwise see if it exists
99 child = BUS_ADD_CHILD(parent, 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);
105 while (chunk < IOMEM_END) {
106 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk,
109 res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul,
110 ~0ul, IOMEM_STEP, RF_ACTIVE);
112 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
116 bt = rman_get_bustag(res);
117 bh = rman_get_bushandle(res);
118 bus_space_read_region_1(bt, bh, 0, buf, sizeof(buf));
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.
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) {
137 rom_size = buf[2] << 9;
138 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk,
141 res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul,
144 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
148 sc->rid[sc->rnum] = rid;
149 sc->res[sc->rnum] = res;
155 * note: sc becomes invalid after we delete the child.
158 device_delete_child(parent, child);
162 device_set_desc(child, "Option ROM");
164 device_set_desc(child, "Option ROMs");
169 orm_detach(device_t dev)
172 struct orm_softc *sc = device_get_softc(dev);
174 for (i = 0; i < sc->rnum; i++)
175 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i],
180 static device_method_t orm_methods[] = {
181 /* Device interface */
182 DEVMETHOD(device_identify, orm_identify),
183 DEVMETHOD(device_probe, orm_probe),
184 DEVMETHOD(device_attach, orm_attach),
185 DEVMETHOD(device_detach, orm_detach),
189 static driver_t orm_driver = {
192 sizeof (struct orm_softc)
195 static devclass_t orm_devclass;
197 DRIVER_MODULE(orm, isa, orm_driver, orm_devclass, 0, 0);