xref: /openbmc/u-boot/drivers/rtc/mc13xxx-rtc.c (revision bfc93fb4)
1 /*
2  * Copyright (C) 2008, Guennadi Liakhovetski <lg@denx.de>
3  *
4  * See file CREDITS for list of people who contributed to this
5  * project.
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License as
9  * published by the Free Software Foundation; either version 2 of
10  * the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20  * MA 02111-1307 USA
21  */
22 
23 #include <common.h>
24 #include <rtc.h>
25 #include <spi.h>
26 #include <pmic.h>
27 #include <fsl_pmic.h>
28 
29 int rtc_get(struct rtc_time *rtc)
30 {
31 	u32 day1, day2, time;
32 	int tim, i = 0;
33 	struct pmic *p = get_pmic();
34 	int ret;
35 
36 	do {
37 		ret = pmic_reg_read(p, REG_RTC_DAY, &day1);
38 		if (ret < 0)
39 			return -1;
40 
41 		ret = pmic_reg_read(p, REG_RTC_TIME, &time);
42 		if (ret < 0)
43 			return -1;
44 
45 		ret = pmic_reg_read(p, REG_RTC_DAY, &day2);
46 		if (ret < 0)
47 			return -1;
48 
49 	} while (day1 != day2 && i++ < 3);
50 
51 	tim = day1 * 86400 + time;
52 
53 	to_tm(tim, rtc);
54 
55 	rtc->tm_yday = 0;
56 	rtc->tm_isdst = 0;
57 
58 	return 0;
59 }
60 
61 int rtc_set(struct rtc_time *rtc)
62 {
63 	u32 time, day;
64 	struct pmic *p = get_pmic();
65 
66 	time = mktime(rtc->tm_year, rtc->tm_mon, rtc->tm_mday,
67 		      rtc->tm_hour, rtc->tm_min, rtc->tm_sec);
68 	day = time / 86400;
69 	time %= 86400;
70 
71 	pmic_reg_write(p, REG_RTC_DAY, day);
72 	pmic_reg_write(p, REG_RTC_TIME, time);
73 
74 	return 0;
75 }
76 
77 void rtc_reset(void)
78 {
79 }
80