1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2001
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 */
6
7 /*
8 * Date & Time support for Philips PCF8563 RTC
9 */
10
11 /* #define DEBUG */
12
13 #include <common.h>
14 #include <command.h>
15 #include <rtc.h>
16 #include <i2c.h>
17
18 #if defined(CONFIG_CMD_DATE)
19
20 static uchar rtc_read (uchar reg);
21 static void rtc_write (uchar reg, uchar val);
22
23 /* ------------------------------------------------------------------------- */
24
rtc_get(struct rtc_time * tmp)25 int rtc_get (struct rtc_time *tmp)
26 {
27 int rel = 0;
28 uchar sec, min, hour, mday, wday, mon_cent, year;
29
30 sec = rtc_read (0x02);
31 min = rtc_read (0x03);
32 hour = rtc_read (0x04);
33 mday = rtc_read (0x05);
34 wday = rtc_read (0x06);
35 mon_cent= rtc_read (0x07);
36 year = rtc_read (0x08);
37
38 debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
39 "hr: %02x min: %02x sec: %02x\n",
40 year, mon_cent, mday, wday,
41 hour, min, sec );
42 debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
43 rtc_read (0x0C),
44 rtc_read (0x0B),
45 rtc_read (0x0A),
46 rtc_read (0x09) );
47
48 if (sec & 0x80) {
49 puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
50 rel = -1;
51 }
52
53 tmp->tm_sec = bcd2bin (sec & 0x7F);
54 tmp->tm_min = bcd2bin (min & 0x7F);
55 tmp->tm_hour = bcd2bin (hour & 0x3F);
56 tmp->tm_mday = bcd2bin (mday & 0x3F);
57 tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
58 tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000);
59 tmp->tm_wday = bcd2bin (wday & 0x07);
60 tmp->tm_yday = 0;
61 tmp->tm_isdst= 0;
62
63 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
64 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
65 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
66
67 return rel;
68 }
69
rtc_set(struct rtc_time * tmp)70 int rtc_set (struct rtc_time *tmp)
71 {
72 uchar century;
73
74 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
75 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
76 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
77
78 rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
79
80 century = (tmp->tm_year >= 2000) ? 0 : 0x80;
81 rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
82
83 rtc_write (0x06, bin2bcd(tmp->tm_wday));
84 rtc_write (0x05, bin2bcd(tmp->tm_mday));
85 rtc_write (0x04, bin2bcd(tmp->tm_hour));
86 rtc_write (0x03, bin2bcd(tmp->tm_min ));
87 rtc_write (0x02, bin2bcd(tmp->tm_sec ));
88
89 return 0;
90 }
91
rtc_reset(void)92 void rtc_reset (void)
93 {
94 /* clear all control & status registers */
95 rtc_write (0x00, 0x00);
96 rtc_write (0x01, 0x00);
97 rtc_write (0x0D, 0x00);
98
99 /* clear Voltage Low bit */
100 rtc_write (0x02, rtc_read (0x02) & 0x7F);
101
102 /* reset all alarms */
103 rtc_write (0x09, 0x00);
104 rtc_write (0x0A, 0x00);
105 rtc_write (0x0B, 0x00);
106 rtc_write (0x0C, 0x00);
107 }
108
109 /* ------------------------------------------------------------------------- */
110
rtc_read(uchar reg)111 static uchar rtc_read (uchar reg)
112 {
113 return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
114 }
115
rtc_write(uchar reg,uchar val)116 static void rtc_write (uchar reg, uchar val)
117 {
118 i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
119 }
120
121 #endif
122