xref: /freebsd/sys/dev/clk/clk_bus.c (revision 8e95079e175854b84e57c521b34b4b52f7ae9cb1)
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/param.h>
28 #include <sys/systm.h>
29 #include <sys/kernel.h>
30 #include <sys/module.h>
31 #include <sys/bus.h>
32 
33 #include <dev/fdt/simplebus.h>
34 
35 #include <dev/ofw/openfirm.h>
36 #include <dev/ofw/ofw_bus_subr.h>
37 
38 struct ofw_clkbus_softc {
39 	struct simplebus_softc simplebus_sc;
40 };
41 
42 static int
43 ofw_clkbus_probe(device_t dev)
44 {
45 	const char	*name;
46 
47 	name = ofw_bus_get_name(dev);
48 
49 	if (name == NULL || strcmp(name, "clocks") != 0)
50 		return (ENXIO);
51 
52 	device_set_desc(dev, "OFW clocks bus");
53 
54 	return (BUS_PROBE_GENERIC);
55 }
56 
57 static int
58 ofw_clkbus_attach(device_t dev)
59 {
60 	phandle_t node, child;
61 	device_t cdev;
62 
63 	node  = ofw_bus_get_node(dev);
64 	simplebus_init(dev, node);
65 
66 	for (child = OF_child(node); child > 0; child = OF_peer(child)) {
67 		cdev = simplebus_add_device(dev, child, 0, NULL, -1, NULL);
68 		if (cdev != NULL)
69 			device_probe_and_attach(cdev);
70 	}
71 
72 	return (bus_generic_attach(dev));
73 }
74 
75 static device_method_t ofw_clkbus_methods[] = {
76 	/* Device interface */
77 	DEVMETHOD(device_probe,		ofw_clkbus_probe),
78 	DEVMETHOD(device_attach,	ofw_clkbus_attach),
79 
80 	DEVMETHOD_END
81 };
82 
83 DEFINE_CLASS_1(ofw_clkbus, ofw_clkbus_driver, ofw_clkbus_methods,
84     sizeof(struct ofw_clkbus_softc), simplebus_driver);
85 EARLY_DRIVER_MODULE(ofw_clkbus, simplebus, ofw_clkbus_driver, 0, 0,
86     BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
87 MODULE_VERSION(ofw_clkbus, 1);
88