1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2024 The FreeBSD Foundation
5 *
6 * This software was developed by Mitchell Horne <mhorne@FreeBSD.org> under
7 * sponsorship from the FreeBSD Foundation.
8 */
9
10 /*
11 * StarFive syscon driver.
12 *
13 * On the JH7110, the PLL clock driver is a child of the sys-syscon device.
14 * This needs to probe very early (BUS_PASS_BUS + BUS_PASS_ORDER_EARLY).
15 */
16
17 #include <sys/param.h>
18 #include <sys/bus.h>
19 #include <sys/kernel.h>
20 #include <sys/module.h>
21 #include <sys/mutex.h>
22
23 #include <machine/bus.h>
24
25 #include <dev/ofw/openfirm.h>
26 #include <dev/ofw/ofw_bus.h>
27 #include <dev/ofw/ofw_bus_subr.h>
28
29 #include <dev/syscon/syscon.h>
30 #include <dev/syscon/syscon_generic.h>
31
32 #include <dev/fdt/simple_mfd.h>
33
34 enum starfive_syscon_type {
35 JH7110_SYSCON_SYS = 1,
36 JH7110_SYSCON_AON,
37 JH7110_SYSCON_STG,
38 };
39
40 static struct ofw_compat_data compat_data[] = {
41 { "starfive,jh7110-sys-syscon", JH7110_SYSCON_SYS },
42 { "starfive,jh7110-aon-syscon", JH7110_SYSCON_AON },
43 { "starfive,jh7110-stg-syscon", JH7110_SYSCON_STG },
44
45 { NULL, 0 }
46 };
47
48 static int
starfive_syscon_probe(device_t dev)49 starfive_syscon_probe(device_t dev)
50 {
51 enum starfive_syscon_type type;
52
53 if (!ofw_bus_status_okay(dev))
54 return (ENXIO);
55
56 type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
57 if (type == 0)
58 return (ENXIO);
59
60 switch (type) {
61 case JH7110_SYSCON_SYS:
62 device_set_desc(dev, "JH7110 SYS syscon");
63 break;
64 case JH7110_SYSCON_AON:
65 device_set_desc(dev, "JH7110 AON syscon");
66 break;
67 case JH7110_SYSCON_STG:
68 device_set_desc(dev, "JH7110 STG syscon");
69 break;
70 }
71
72 return (BUS_PROBE_DEFAULT);
73 }
74
75
76 static device_method_t starfive_syscon_methods[] = {
77 DEVMETHOD(device_probe, starfive_syscon_probe),
78
79 DEVMETHOD_END
80 };
81
82 DEFINE_CLASS_1(starfive_syscon, starfive_syscon_driver, starfive_syscon_methods,
83 sizeof(struct syscon_generic_softc), simple_mfd_driver);
84
85 EARLY_DRIVER_MODULE(starfive_syscon, simplebus, starfive_syscon_driver, 0, 0,
86 BUS_PASS_BUS + BUS_PASS_ORDER_EARLY);
87 MODULE_VERSION(starfive_syscon, 1);
88