1/*-
2 * Copyright (C) 2006-2008 Semihalf, Grzegorz Bernacki
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * From: FreeBSD: src/sys/powerpc/mpc85xx/ds1553_bus_lbc.c,v 1.2 2009/06/24 15:48:20 raj
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/cdefs.h>
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
52static devclass_t rtc_devclass;
53
54static int rtc_attach(device_t dev);
55static int rtc_probe(device_t dev);
56
57static device_method_t rtc_methods[] = {
58	/* Device interface */
59	DEVMETHOD(device_probe,		rtc_probe),
60	DEVMETHOD(device_attach,	rtc_attach),
61
62	/* clock interface */
63	DEVMETHOD(clock_gettime,	ds1553_gettime),
64	DEVMETHOD(clock_settime,	ds1553_settime),
65
66	{ 0, 0 }
67};
68
69static driver_t rtc_driver = {
70	"rtc",
71	rtc_methods,
72	sizeof(struct ds1553_softc),
73};
74
75DRIVER_MODULE(rtc, lbc, rtc_driver, rtc_devclass, 0, 0);
76
77static int
78rtc_probe(device_t dev)
79{
80
81	if (!ofw_bus_is_compatible(dev, "dallas,ds1553"))
82		return (ENXIO);
83
84	device_set_desc(dev, "Dallas Semiconductor DS1553 RTC");
85	return (BUS_PROBE_DEFAULT);
86}
87
88static int
89rtc_attach(device_t dev)
90{
91	struct timespec ts;
92	struct ds1553_softc *sc;
93	int error;
94
95	sc = device_get_softc(dev);
96	bzero(sc, sizeof(struct ds1553_softc));
97
98	mtx_init(&sc->sc_mtx, "rtc_mtx", NULL, MTX_SPIN);
99
100	sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
101	    RF_ACTIVE);
102	if (sc->res == NULL) {
103		device_printf(dev, "cannot allocate resources\n");
104		mtx_destroy(&sc->sc_mtx);
105		return (ENXIO);
106	}
107
108	sc->sc_bst = rman_get_bustag(sc->res);
109	sc->sc_bsh = rman_get_bushandle(sc->res);
110
111	if ((error = ds1553_attach(dev)) != 0) {
112		device_printf(dev, "cannot attach time of day clock\n");
113		bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
114		mtx_destroy(&sc->sc_mtx);
115		return (error);
116	}
117
118	clock_register(dev, 1000000);
119
120	if (bootverbose) {
121		ds1553_gettime(dev, &ts);
122		device_printf(dev, "current time: %ld.%09ld\n",
123		    (long)ts.tv_sec, ts.tv_nsec);
124	}
125
126	return (0);
127}
128