1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (C) 2006-2008 Semihalf, Grzegorz Bernacki
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 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 * From: FreeBSD: src/sys/powerpc/mpc85xx/ds1553_bus_lbc.c,v 1.2 2009/06/24 15:48:20 raj
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/cdefs.h>
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/bus.h>
38 #include <sys/clock.h>
39 #include <sys/kernel.h>
40 #include <sys/lock.h>
41 #include <sys/module.h>
42 #include <sys/mutex.h>
43 #include <sys/resource.h>
44 #include <sys/rman.h>
45
46 #include <machine/bus.h>
47 #include <machine/resource.h>
48
49 #include <dev/ofw/ofw_bus_subr.h>
50
51 #include "ds1553_reg.h"
52 #include "clock_if.h"
53
54 static devclass_t rtc_devclass;
55
56 static int rtc_attach(device_t dev);
57 static int rtc_probe(device_t dev);
58
59 static device_method_t rtc_methods[] = {
60 /* Device interface */
61 DEVMETHOD(device_probe, rtc_probe),
62 DEVMETHOD(device_attach, rtc_attach),
63
64 /* clock interface */
65 DEVMETHOD(clock_gettime, ds1553_gettime),
66 DEVMETHOD(clock_settime, ds1553_settime),
67
68 { 0, 0 }
69 };
70
71 static driver_t rtc_driver = {
72 "rtc",
73 rtc_methods,
74 sizeof(struct ds1553_softc),
75 };
76
77 DRIVER_MODULE(rtc, lbc, rtc_driver, rtc_devclass, 0, 0);
78
79 static int
rtc_probe(device_t dev)80 rtc_probe(device_t dev)
81 {
82
83 if (!ofw_bus_is_compatible(dev, "dallas,ds1553"))
84 return (ENXIO);
85
86 device_set_desc(dev, "Dallas Semiconductor DS1553 RTC");
87 return (BUS_PROBE_DEFAULT);
88 }
89
90 static int
rtc_attach(device_t dev)91 rtc_attach(device_t dev)
92 {
93 struct timespec ts;
94 struct ds1553_softc *sc;
95 int error;
96
97 sc = device_get_softc(dev);
98 bzero(sc, sizeof(struct ds1553_softc));
99
100 mtx_init(&sc->sc_mtx, "rtc_mtx", NULL, MTX_SPIN);
101
102 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
103 RF_ACTIVE);
104 if (sc->res == NULL) {
105 device_printf(dev, "cannot allocate resources\n");
106 mtx_destroy(&sc->sc_mtx);
107 return (ENXIO);
108 }
109
110 sc->sc_bst = rman_get_bustag(sc->res);
111 sc->sc_bsh = rman_get_bushandle(sc->res);
112
113 if ((error = ds1553_attach(dev)) != 0) {
114 device_printf(dev, "cannot attach time of day clock\n");
115 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
116 mtx_destroy(&sc->sc_mtx);
117 return (error);
118 }
119
120 clock_register(dev, 1000000);
121
122 if (bootverbose) {
123 ds1553_gettime(dev, &ts);
124 device_printf(dev, "current time: %ld.%09ld\n",
125 (long)ts.tv_sec, ts.tv_nsec);
126 }
127
128 return (0);
129 }
130