rtc.c revision 139825 
1/*-
2 * Copyright (c) 2004 Marius Strobl <marius@FreeBSD.org>
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 THE 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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/sparc64/sparc64/rtc.c 139825 2005-01-07 02:29:27Z imp $");
29
30/*
31 * The `rtc' device is a MC146818 compatible clock found on the ISA bus
32 * and EBus. The EBus version also has an interrupt property so it could
33 * be used to drive the statclock etc.
34 */
35
36#include "opt_isa.h"
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/bus.h>
41#include <sys/kernel.h>
42#include <sys/module.h>
43#include <sys/resource.h>
44
45#include <dev/ofw/ofw_bus.h>
46
47#include <machine/bus.h>
48#include <machine/resource.h>
49
50#include <sys/rman.h>
51
52#include <isa/isavar.h>
53
54#include <dev/mc146818/mc146818var.h>
55
56#include "clock_if.h"
57
58static devclass_t rtc_devclass;
59
60static int	rtc_attach(device_t dev);
61static int	rtc_ebus_probe(device_t dev);
62#ifdef DEV_ISA
63static int	rtc_isa_probe(device_t dev);
64#endif
65
66static device_method_t rtc_ebus_methods[] = {
67	/* Device interface */
68	DEVMETHOD(device_probe,		rtc_ebus_probe),
69	DEVMETHOD(device_attach,	rtc_attach),
70
71	/* clock interface */
72	DEVMETHOD(clock_gettime,	mc146818_gettime),
73	DEVMETHOD(clock_settime,	mc146818_settime),
74#ifdef notyet
75	DEVMETHOD(clock_getsecs,	mc146818_getsecs),
76#endif
77
78	{ 0, 0 }
79};
80
81static driver_t rtc_ebus_driver = {
82	"rtc",
83	rtc_ebus_methods,
84	sizeof(struct mc146818_softc),
85};
86
87DRIVER_MODULE(rtc, ebus, rtc_ebus_driver, rtc_devclass, 0, 0);
88
89#ifdef DEV_ISA
90static device_method_t rtc_isa_methods[] = {
91	/* Device interface */
92	DEVMETHOD(device_probe,		rtc_isa_probe),
93	DEVMETHOD(device_attach,	rtc_attach),
94
95	/* clock interface */
96	DEVMETHOD(clock_gettime,	mc146818_gettime),
97	DEVMETHOD(clock_settime,	mc146818_settime),
98#ifdef notyet
99	DEVMETHOD(clock_getsecs,	mc146818_getsecs),
100#endif
101
102	{ 0, 0 }
103};
104
105static driver_t rtc_isa_driver = {
106	"rtc",
107	rtc_isa_methods,
108	sizeof(struct mc146818_softc),
109};
110
111DRIVER_MODULE(rtc, isa, rtc_isa_driver, rtc_devclass, 0, 0);
112#endif
113
114static int
115rtc_ebus_probe(device_t dev)
116{
117
118	if (strcmp(ofw_bus_get_name(dev), "rtc") == 0) {
119		device_set_desc(dev, "Real Time Clock");
120		return (0);
121	}
122
123	return (ENXIO);
124}
125
126#ifdef DEV_ISA
127static struct isa_pnp_id rtc_isa_ids[] = {
128	{ 0x000bd041, "AT realtime clock" }, /* PNP0B00 */
129	{ 0 }
130};
131
132static int
133rtc_isa_probe(device_t dev)
134{
135
136	if (ISA_PNP_PROBE(device_get_parent(dev), dev, rtc_isa_ids) == 0) {
137		device_set_desc(dev, "Real Time Clock");
138		return (0);
139	}
140
141	return (ENXIO);
142}
143#endif
144
145static int
146rtc_attach(device_t dev)
147{
148	struct timespec ts;
149	struct mc146818_softc *sc;
150	struct resource *res;
151	int error, rid;
152
153	sc = device_get_softc(dev);
154	bzero(sc, sizeof(struct mc146818_softc));
155
156	rid = 0;
157	res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid, RF_ACTIVE);
158	if (res == NULL) {
159		device_printf(dev, "could not allocate resources\n");
160		return (ENXIO);
161	}
162	sc->sc_bst = rman_get_bustag(res);
163	sc->sc_bsh = rman_get_bushandle(res);
164
165	/* The TOD clock year 0 is 0. */
166	sc->sc_year0 = 0;
167	/* Use default register read/write and century get/set functions. */
168	sc->sc_flag = MC146818_NO_CENT_ADJUST;
169	if ((error = mc146818_attach(dev)) != 0) {
170		device_printf(dev, "cannot attach time of day clock\n");
171		return (error);
172	}
173
174	if (bootverbose) {
175		mc146818_gettime(dev, &ts);
176		device_printf(dev, "current time: %ld.%09ld\n", (long)ts.tv_sec,
177		    ts.tv_nsec);
178        }
179
180	return (0);
181}
182