as3722_rtc.c revision 296936 
1/*-
2 * Copyright (c) 2016 Michal Meloun <mmel@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/arm/nvidia/as3722_rtc.c 296936 2016-03-16 13:01:48Z mmel $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/clock.h>
34#include <sys/kernel.h>
35
36#include <dev/ofw/ofw_bus.h>
37
38#include "clock_if.h"
39#include "as3722.h"
40
41#define	AS3722_RTC_START_YEAR	2000
42
43int
44as3722_rtc_gettime(device_t dev, struct timespec *ts)
45{
46	struct as3722_softc *sc;
47	struct clocktime ct;
48	uint8_t buf[6];
49	int rv;
50
51	sc = device_get_softc(dev);
52
53	rv = as3722_read_buf(sc, AS3722_RTC_SECOND, buf, 6);
54	if (rv != 0) {
55		device_printf(sc->dev, "Failed to read RTC data\n");
56		return (rv);
57	}
58	ct.nsec = 0;
59	ct.sec = bcd2bin(buf[0] & 0x7F);
60	ct.min = bcd2bin(buf[1] & 0x7F);
61	ct.hour = bcd2bin(buf[2] & 0x3F);
62	ct.day = bcd2bin(buf[3] & 0x3F);
63	ct.mon = bcd2bin(buf[4] & 0x1F);
64	ct.year = bcd2bin(buf[5] & 0x7F) + AS3722_RTC_START_YEAR;
65	ct.dow = -1;
66
67	return clock_ct_to_ts(&ct, ts);
68}
69
70int
71as3722_rtc_settime(device_t dev, struct timespec *ts)
72{
73	struct as3722_softc *sc;
74	struct clocktime ct;
75	uint8_t buf[6];
76	int rv;
77
78	sc = device_get_softc(dev);
79	clock_ts_to_ct(ts, &ct);
80
81	if (ct.year < AS3722_RTC_START_YEAR)
82		return (EINVAL);
83
84	buf[0] = bin2bcd(ct.sec);
85	buf[1] = bin2bcd(ct.min);
86	buf[2] = bin2bcd(ct.hour);
87	buf[3] = bin2bcd(ct.day);
88	buf[4] = bin2bcd(ct.mon);
89	buf[5] = bin2bcd(ct.year - AS3722_RTC_START_YEAR);
90
91	rv = as3722_write_buf(sc, AS3722_RTC_SECOND, buf, 6);
92	if (rv != 0) {
93		device_printf(sc->dev, "Failed to write RTC data\n");
94		return (rv);
95	}
96	return (0);
97}
98
99int
100as3722_rtc_attach(struct as3722_softc *sc, phandle_t node)
101{
102	int rv;
103
104	/* Enable RTC, set 24 hours mode  and alarms */
105	rv = RM1(sc, AS3722_RTC_CONTROL,
106	    AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN | AS3722_RTC_AM_PM_MODE,
107	    AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN);
108	if (rv < 0) {
109		device_printf(sc->dev, "Failed to initialize RTC controller\n");
110		return (ENXIO);
111	}
112	clock_register(sc->dev, 1000000);
113
114	return (0);
115}
116