1 /*-
2 * Copyright (c) 2016 Stanislav Galabov.
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 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/module.h>
31 #include <sys/bus.h>
32 #include <sys/conf.h>
33 #include <sys/kernel.h>
34 #include <sys/rman.h>
35
36 #include <dev/ofw/openfirm.h>
37 #include <dev/ofw/ofw_bus.h>
38 #include <dev/ofw/ofw_bus_subr.h>
39
40 #include <dev/fdt/simplebus.h>
41
42 /*
43 * Driver for Mediatek/Ralink Palmbus
44 *
45 * Currently the only reason for the existence of this driver is so that we can
46 * minimize the changes required to the upstream DTS files we use.
47 * Otherwise palmbus is a very simple subclass of our simplebus and the only
48 * difference between the two is the actual value of the compatible property.
49 */
50
51 static int
palmbus_probe(device_t dev)52 palmbus_probe(device_t dev)
53 {
54
55 if (!ofw_bus_status_okay(dev))
56 return (ENXIO);
57
58 if (!(ofw_bus_is_compatible(dev, "palmbus") &&
59 ofw_bus_has_prop(dev, "ranges")) &&
60 (ofw_bus_get_type(dev) == NULL || strcmp(ofw_bus_get_type(dev),
61 "soc") != 0))
62 return (ENXIO);
63
64 device_set_desc(dev, "MTK Palmbus");
65
66 return (0);
67 }
68
69 static device_method_t palmbus_methods[] = {
70 DEVMETHOD(device_probe, palmbus_probe),
71
72 DEVMETHOD_END
73 };
74
75 DEFINE_CLASS_1(palmbus, palmbus_driver, palmbus_methods,
76 sizeof(struct simplebus_softc), simplebus_driver);
77 static devclass_t palmbus_devclass;
78 EARLY_DRIVER_MODULE(palmbus, ofwbus, palmbus_driver, palmbus_devclass, 0, 0,
79 BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
80 MODULE_VERSION(palmbus, 1);
81