xref: /freebsd/sys/arm/allwinner/aw_syscon.c (revision 78ae60b4)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27 
28 /*
29  * Allwinner syscon driver
30  */
31 
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
36 #include <sys/mutex.h>
37 #include <sys/rman.h>
38 #include <machine/bus.h>
39 
40 #include <dev/ofw/openfirm.h>
41 #include <dev/ofw/ofw_bus.h>
42 #include <dev/ofw/ofw_bus_subr.h>
43 
44 #include <dev/syscon/syscon.h>
45 #include <dev/syscon/syscon_generic.h>
46 
47 static struct ofw_compat_data compat_data[] = {
48 	{"allwinner,sun50i-a64-system-controller", 1},
49 	{"allwinner,sun50i-a64-system-control", 1},
50 	{"allwinner,sun8i-a83t-system-controller", 1},
51 	{"allwinner,sun8i-h3-system-controller", 1},
52 	{"allwinner,sun8i-h3-system-control", 1},
53 	{"allwinner,sun50i-h5-system-control", 1},
54 	{NULL,             0}
55 };
56 
57 static int
58 aw_syscon_probe(device_t dev)
59 {
60 
61 	if (!ofw_bus_status_okay(dev))
62 		return (ENXIO);
63 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
64 		return (ENXIO);
65 
66 	device_set_desc(dev, "Allwinner syscon");
67 	return (BUS_PROBE_DEFAULT);
68 }
69 
70 static device_method_t aw_syscon_methods[] = {
71 	DEVMETHOD(device_probe, aw_syscon_probe),
72 
73 	DEVMETHOD_END
74 };
75 
76 DEFINE_CLASS_1(aw_syscon, aw_syscon_driver, aw_syscon_methods,
77     sizeof(struct syscon_generic_softc), syscon_generic_driver);
78 
79 /* aw_syscon needs to attach prior to if_awg */
80 EARLY_DRIVER_MODULE(aw_syscon, simplebus, aw_syscon_driver, 0, 0,
81     BUS_PASS_SCHEDULER + BUS_PASS_ORDER_LAST);
82 MODULE_VERSION(aw_syscon, 1);
83