xref: /freebsd/sys/arm64/rockchip/rk_grf.c (revision 406a584d7e80c2617dc035ede0d922215a12141c)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2018 Emmanuel Vadot <manu@FreeBSD.org>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
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/extres/syscon/syscon.h>
45 #include <dev/extres/syscon/syscon_generic.h>
46 
47 #include "opt_soc.h"
48 
49 static struct ofw_compat_data compat_data[] = {
50 #ifdef SOC_ROCKCHIP_RK3328
51 	{"rockchip,rk3328-grf", 1},
52 #endif
53 #ifdef SOC_ROCKCHIP_RK3399
54 	{"rockchip,rk3399-grf", 1},
55 	{"rockchip,rk3399-pmugrf", 1},
56 #endif
57 	{NULL,             0}
58 };
59 
60 static int
61 rk_grf_probe(device_t dev)
62 {
63 
64 	if (!ofw_bus_status_okay(dev))
65 		return (ENXIO);
66 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
67 		return (ENXIO);
68 
69 	device_set_desc(dev, "RockChip General Register Files");
70 	return (BUS_PROBE_DEFAULT);
71 }
72 
73 static device_method_t rk_grf_methods[] = {
74 	DEVMETHOD(device_probe, rk_grf_probe),
75 
76 	DEVMETHOD_END
77 };
78 
79 DEFINE_CLASS_1(rk_grf, rk_grf_driver, rk_grf_methods,
80     sizeof(struct syscon_generic_softc), syscon_generic_driver);
81 
82 static devclass_t rk_grf_devclass;
83 EARLY_DRIVER_MODULE(rk_grf, simplebus, rk_grf_driver, rk_grf_devclass,
84     0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
85 MODULE_VERSION(rk_grf, 1);
86