xref: /freebsd/sys/dev/vnic/thunder_mdio_fdt.c (revision 277fbb92d5e4cd0938c67f77b08d9ba4ac9d54a6)
1 /*-
2  * Copyright (c) 2015 The FreeBSD Foundation
3  * All rights reserved.
4  *
5  * This software was developed by Semihalf under
6  * the sponsorship of the FreeBSD Foundation.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32 
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/bus.h>
36 #include <sys/kernel.h>
37 #include <sys/module.h>
38 
39 #include <dev/ofw/ofw_bus.h>
40 #include <dev/ofw/ofw_bus_subr.h>
41 
42 #include "thunder_mdio_var.h"
43 
44 static int thunder_mdio_fdt_probe(device_t);
45 static int thunder_mdio_fdt_attach(device_t);
46 
47 static device_method_t thunder_mdio_fdt_methods[] = {
48 	/* Device interface */
49 	DEVMETHOD(device_probe,		thunder_mdio_fdt_probe),
50 	DEVMETHOD(device_attach,	thunder_mdio_fdt_attach),
51 
52 	/* End */
53 	DEVMETHOD_END
54 };
55 
56 DEFINE_CLASS_1(thunder_mdio, thunder_mdio_fdt_driver, thunder_mdio_fdt_methods,
57     sizeof(struct thunder_mdio_softc), thunder_mdio_driver);
58 
59 static devclass_t thunder_mdio_fdt_devclass;
60 
61 EARLY_DRIVER_MODULE(thunder_mdio, ofwbus, thunder_mdio_fdt_driver,
62     thunder_mdio_fdt_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
63 
64 static int
65 thunder_mdio_fdt_probe(device_t dev)
66 {
67 
68 	if (ofw_bus_is_compatible(dev, "cavium,octeon-3860-mdio")) {
69 		device_set_desc(dev, THUNDER_MDIO_DEVSTR);
70 		return (BUS_PROBE_DEFAULT);
71 	}
72 
73 	return (ENXIO);
74 }
75 
76 static int
77 thunder_mdio_fdt_attach(device_t dev)
78 {
79 	phandle_t node;
80 	int ret;
81 
82 	/* Call core attach */
83 	ret = thunder_mdio_attach(dev);
84 	if (ret != 0)
85 		return (ret);
86 	/*
87 	 * Register device to this node/xref.
88 	 * Thanks to that we will be able to retrieve device_t structure
89 	 * while holding only node reference acquired from FDT.
90 	 */
91 	node = ofw_bus_get_node(dev);
92 	OF_device_register_xref(OF_xref_from_node(node), dev);
93 
94 	return (0);
95 }
96