1/*--
2 * Copyright (c) 2012 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Paul Fleischer <paul@xpg.dk>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29#include <sys/cdefs.h>
30#include <sys/types.h>
31#include <sys/param.h>
32#include <sys/device.h>
33#include <sys/bus.h>
34#include <sys/time.h>
35
36#include <dev/clock_subr.h>
37
38#include <arm/s3c2xx0/s3c24x0var.h>
39#include <arm/s3c2xx0/s3c2440var.h>
40#include <arm/s3c2xx0/s3c2440reg.h>
41
42#ifdef SSRTC_DEBUG
43#define DPRINTF(s) do { printf s; } while (/*CONSTCOND*/0)
44#else
45#define DPRINTF(s) do {} while (/*CONSTCOND*/0)
46#endif
47
48/* As the RTC keeps track of Leap years, we need to use the right zero-year */
49#define SSRTC_YEAR_ZERO 2000
50
51struct ssrtc_softc {
52	device_t		sc_dev;
53	bus_space_tag_t		sc_iot;
54	bus_space_handle_t	sc_ioh;
55	struct todr_chip_handle	sc_todr;
56};
57
58static int  ssrtc_match(device_t, cfdata_t, void *);
59static void ssrtc_attach(device_t, device_t, void *);
60
61CFATTACH_DECL_NEW(ssrtc, sizeof(struct ssrtc_softc),
62  ssrtc_match, ssrtc_attach, NULL, NULL);
63
64static int ssrtc_todr_gettime(struct todr_chip_handle *, struct timeval *);
65static int ssrtc_todr_settime(struct todr_chip_handle *, struct timeval *);
66
67static int
68ssrtc_match(device_t parent, cfdata_t cf, void *aux)
69{
70	return 1;
71}
72
73static void
74ssrtc_attach(device_t parent, device_t self, void *aux)
75{
76	struct ssrtc_softc *sc = device_private(self);
77	struct s3c2xx0_attach_args *sa = aux;
78
79	sc->sc_dev = self;
80	sc->sc_iot = sa->sa_iot;
81
82	if (bus_space_map(sc->sc_iot, S3C2440_RTC_BASE,
83			  S3C2440_RTC_SIZE, 0, &sc->sc_ioh)) {
84		aprint_error(": failed to map registers");
85		return;
86	}
87	aprint_normal(": RTC \n");
88
89	sc->sc_todr.cookie = sc;
90	sc->sc_todr.todr_gettime = ssrtc_todr_gettime;
91	sc->sc_todr.todr_settime = ssrtc_todr_settime;
92	sc->sc_todr.todr_setwen = NULL;
93
94	todr_attach(&sc->sc_todr);
95}
96
97static int
98ssrtc_todr_gettime(struct todr_chip_handle *h, struct timeval *tv)
99{
100	struct ssrtc_softc *sc = h->cookie;
101	struct clock_ymdhms dt;
102	uint8_t reg;
103
104	reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, RTC_BCDSEC);
105	DPRINTF(("BCDSEC: %02X\n", reg));
106	dt.dt_sec = FROMBCD(reg);
107
108	reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, RTC_BCDMIN);
109	DPRINTF(("BCDMIN: %02X\n", reg));
110	dt.dt_min = FROMBCD(reg);
111
112	reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, RTC_BCDHOUR);
113	DPRINTF(("BCDHOUR: %02X\n", reg));
114	dt.dt_hour = FROMBCD(reg);
115
116	reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, RTC_BCDDATE);
117	DPRINTF(("BCDDATE: %02X\n", reg));
118	dt.dt_day = FROMBCD(reg);
119
120	reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, RTC_BCDDAY);
121	DPRINTF(("BCDDAY: %02X\n", reg));
122	dt.dt_wday = FROMBCD(reg);
123
124	reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, RTC_BCDMON);
125	DPRINTF(("BCDMON: %02X\n", reg));
126	dt.dt_mon = FROMBCD(reg);
127
128	reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, RTC_BCDYEAR);
129	DPRINTF(("BCDYEAR: %02X\n", reg));
130	dt.dt_year = SSRTC_YEAR_ZERO + FROMBCD(reg);
131
132	DPRINTF(("Seconds: %d\n", dt.dt_sec));
133	DPRINTF(("Minutes: %d\n", dt.dt_min));
134	DPRINTF(("Hour: %d\n", dt.dt_hour));
135	DPRINTF(("Mon: %d\n", dt.dt_mon));
136	DPRINTF(("Date: %d\n", dt.dt_day));
137	DPRINTF(("Day: %d\n", dt.dt_wday));
138	DPRINTF(("Year: %d\n", dt.dt_year));
139
140	tv->tv_sec = clock_ymdhms_to_secs(&dt);
141	tv->tv_usec = 0;
142
143	return 0;
144}
145
146static int
147ssrtc_todr_settime(struct todr_chip_handle *h, struct timeval *tv)
148{
149	struct ssrtc_softc *sc = h->cookie;
150	struct clock_ymdhms dt;
151	uint8_t reg;
152
153	clock_secs_to_ymdhms(tv->tv_sec, &dt);
154
155	DPRINTF(("ssrtc_todr_settime"));
156
157	/* Set RTCEN */
158	reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, RTC_RTCCON);
159	bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_RTCCON, reg | RTCCON_RTCEN);
160
161	bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_BCDSEC, TOBCD(dt.dt_sec));
162	bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_BCDMIN, TOBCD(dt.dt_min));
163	bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_BCDHOUR, TOBCD(dt.dt_hour));
164	bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_BCDDATE, TOBCD(dt.dt_day));
165	bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_BCDDAY, TOBCD(dt.dt_wday));
166	bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_BCDMON, TOBCD(dt.dt_mon));
167	bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_BCDYEAR, TOBCD(dt.dt_year-SSRTC_YEAR_ZERO));
168
169	/* Clear RTCEN */
170	reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, RTC_RTCCON);
171	bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_RTCCON, reg & ~RTCCON_RTCEN);
172	return 0;
173}
174