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