FreeBSD/Linux Kernel Cross Reference
sys/riscv/riscv/soc.c
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2018 Ruslan Bukin <br@bsdpad.com>
5 * All rights reserved.
6 *
7 * This software was developed by SRI International and the University of
8 * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
9 * ("CTSRD"), as part of the DARPA CRASH 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/ofw/ofw_bus_subr.h>
43
44 struct soc_softc {
45 struct simplebus_softc simplebus_sc;
46 device_t dev;
47 };
48
49 static int
50 soc_probe(device_t dev)
51 {
52
53 if (!ofw_bus_status_okay(dev))
54 return (ENXIO);
55
56 if (!ofw_bus_is_compatible(dev, "riscv-virtio-soc"))
57 return (ENXIO);
58
59 device_set_desc(dev, "RISC-V SoC");
60
61 return (BUS_PROBE_DEFAULT);
62 }
63
64 static int
65 soc_attach(device_t dev)
66 {
67 struct soc_softc *sc;
68 phandle_t node;
69
70 sc = device_get_softc(dev);
71 sc->dev = dev;
72
73 node = ofw_bus_get_node(dev);
74 if (node == -1)
75 return (ENXIO);
76
77 simplebus_init(dev, node);
78
79 /*
80 * Allow devices to identify.
81 */
82 bus_generic_probe(dev);
83
84 /*
85 * Now walk the OFW tree and attach top-level devices.
86 */
87 for (node = OF_child(node); node > 0; node = OF_peer(node))
88 simplebus_add_device(dev, node, 0, NULL, -1, NULL);
89
90 return (bus_generic_attach(dev));
91 }
92
93 static int
94 soc_detach(device_t dev)
95 {
96
97 return (0);
98 }
99
100 static device_method_t soc_methods[] = {
101 DEVMETHOD(device_probe, soc_probe),
102 DEVMETHOD(device_attach, soc_attach),
103 DEVMETHOD(device_detach, soc_detach),
104 DEVMETHOD_END
105 };
106
107 DEFINE_CLASS_1(soc, soc_driver, soc_methods, sizeof(struct soc_softc),
108 simplebus_driver);
109 static devclass_t soc_devclass;
110 EARLY_DRIVER_MODULE(soc, simplebus, soc_driver, soc_devclass, 0, 0,
111 BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
112 MODULE_VERSION(soc, 1);
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