1/*-
2 * Copyright 2016 Michal Meloun <mmel@FreeBSD.org>
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
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/module.h>
34#include <sys/bus.h>
35
36#include <dev/fdt/simplebus.h>
37
38#include <dev/ofw/openfirm.h>
39#include <dev/ofw/ofw_bus_subr.h>
40
41struct ofw_clkbus_softc {
42	struct simplebus_softc simplebus_sc;
43};
44
45static int
46ofw_clkbus_probe(device_t dev)
47{
48	const char	*name;
49
50	name = ofw_bus_get_name(dev);
51
52	if (name == NULL || strcmp(name, "clocks") != 0)
53		return (ENXIO);
54
55	device_set_desc(dev, "OFW clocks bus");
56
57	return (BUS_PROBE_GENERIC);
58}
59
60static int
61ofw_clkbus_attach(device_t dev)
62{
63	phandle_t node, child;
64	device_t cdev;
65
66	node  = ofw_bus_get_node(dev);
67	simplebus_init(dev, node);
68
69	for (child = OF_child(node); child > 0; child = OF_peer(child)) {
70		cdev = simplebus_add_device(dev, child, 0, NULL, -1, NULL);
71		if (cdev != NULL)
72			device_probe_and_attach(cdev);
73	}
74
75	return (bus_generic_attach(dev));
76}
77
78static device_method_t ofw_clkbus_methods[] = {
79	/* Device interface */
80	DEVMETHOD(device_probe,		ofw_clkbus_probe),
81	DEVMETHOD(device_attach,	ofw_clkbus_attach),
82
83	DEVMETHOD_END
84};
85
86DEFINE_CLASS_1(ofw_clkbus, ofw_clkbus_driver, ofw_clkbus_methods,
87    sizeof(struct ofw_clkbus_softc), simplebus_driver);
88static devclass_t ofw_clkbus_devclass;
89EARLY_DRIVER_MODULE(ofw_clkbus, simplebus, ofw_clkbus_driver,
90    ofw_clkbus_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
91MODULE_VERSION(ofw_clkbus, 1);
92