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__FBSDID("$FreeBSD$");
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/module.h>
32#include <sys/bus.h>
33#include <sys/conf.h>
34#include <sys/kernel.h>
35#include <sys/rman.h>
36
37#include <dev/ofw/openfirm.h>
38#include <dev/ofw/ofw_bus.h>
39#include <dev/ofw/ofw_bus_subr.h>
40
41#include <dev/fdt/simplebus.h>
42
43/*
44 * Driver for Mediatek/Ralink Palmbus
45 *
46 * Currently the only reason for the existence of this driver is so that we can
47 * minimize the changes required to the upstream DTS files we use.
48 * Otherwise palmbus is a very simple subclass of our simplebus and the only
49 * difference between the two is the actual value of the compatible property.
50 */
51
52static int
53palmbus_probe(device_t dev)
54{
55
56	if (!ofw_bus_status_okay(dev))
57		return (ENXIO);
58
59	if (!(ofw_bus_is_compatible(dev, "palmbus") &&
60	    ofw_bus_has_prop(dev, "ranges")) &&
61	    (ofw_bus_get_type(dev) == NULL || strcmp(ofw_bus_get_type(dev),
62	    "soc") != 0))
63		return (ENXIO);
64
65	device_set_desc(dev, "MTK Palmbus");
66
67	return (0);
68}
69
70static device_method_t palmbus_methods[] = {
71	DEVMETHOD(device_probe,		palmbus_probe),
72
73	DEVMETHOD_END
74};
75
76DEFINE_CLASS_1(palmbus, palmbus_driver, palmbus_methods,
77    sizeof(struct simplebus_softc), simplebus_driver);
78static devclass_t palmbus_devclass;
79EARLY_DRIVER_MODULE(palmbus, ofwbus, palmbus_driver, palmbus_devclass, 0, 0,
80    BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
81MODULE_VERSION(palmbus, 1);
82