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
54static devclass_t rtc_devclass;
55
56static int rtc_attach(device_t dev);
57static int rtc_probe(device_t dev);
58
59static 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
71static driver_t rtc_driver = {
72	"rtc",
73	rtc_methods,
74	sizeof(struct ds1553_softc),
75};
76
77DRIVER_MODULE(rtc, lbc, rtc_driver, rtc_devclass, 0, 0);
78
79static int
80rtc_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
90static int
91rtc_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