1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2019 Ruslan Bukin <[email protected]>
5 *
6 * This software was developed by SRI International and the University of
7 * Cambridge Computer Laboratory (Department of Computer Science and
8 * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
9 * DARPA SSITH research programme.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40
41 #include <dev/fdt/simplebus.h>
42 #include <dev/fdt/fdt_common.h>
43 #include <dev/ofw/ofw_bus_subr.h>
44
45 struct firmware_softc {
46 struct simplebus_softc simplebus_sc;
47 device_t dev;
48 };
49
50 static int
firmware_probe(device_t dev)51 firmware_probe(device_t dev)
52 {
53 phandle_t node;
54
55 node = ofw_bus_get_node(dev);
56
57 /*
58 * The firmware node has no property compatible.
59 * Look for a known child.
60 */
61 if (!fdt_depth_search_compatible(node, "intel,stratix10-svc", 0))
62 return (ENXIO);
63
64 if (!ofw_bus_status_okay(dev))
65 return (ENXIO);
66
67 device_set_desc(dev, "Firmware node");
68
69 return (BUS_PROBE_DEFAULT);
70 }
71
72 static int
firmware_attach(device_t dev)73 firmware_attach(device_t dev)
74 {
75 struct firmware_softc *sc;
76 phandle_t node;
77
78 sc = device_get_softc(dev);
79 sc->dev = dev;
80
81 node = ofw_bus_get_node(dev);
82 if (node == -1)
83 return (ENXIO);
84
85 simplebus_init(dev, node);
86
87 /*
88 * Allow devices to identify.
89 */
90 bus_generic_probe(dev);
91
92 /*
93 * Now walk the OFW tree and attach top-level devices.
94 */
95 for (node = OF_child(node); node > 0; node = OF_peer(node))
96 simplebus_add_device(dev, node, 0, NULL, -1, NULL);
97
98 return (bus_generic_attach(dev));
99 }
100
101 static int
firmware_detach(device_t dev)102 firmware_detach(device_t dev)
103 {
104
105 return (0);
106 }
107
108 static device_method_t firmware_methods[] = {
109 DEVMETHOD(device_probe, firmware_probe),
110 DEVMETHOD(device_attach, firmware_attach),
111 DEVMETHOD(device_detach, firmware_detach),
112 DEVMETHOD_END
113 };
114
115 DEFINE_CLASS_1(firmware, firmware_driver, firmware_methods,
116 sizeof(struct firmware_softc), simplebus_driver);
117
118 static devclass_t firmware_devclass;
119
120 EARLY_DRIVER_MODULE(firmware, simplebus, firmware_driver, firmware_devclass,
121 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
122 MODULE_VERSION(firmware, 1);
123