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git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/rtc/pcf8563.c
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 * Date & Time support for Philips PCF8563 RTC
35 #if defined(CONFIG_CMD_DATE)
37 static uchar
rtc_read (uchar reg
);
38 static void rtc_write (uchar reg
, uchar val
);
39 static uchar
bin2bcd (unsigned int n
);
40 static unsigned bcd2bin(uchar c
);
42 /* ------------------------------------------------------------------------- */
44 int rtc_get (struct rtc_time
*tmp
)
47 uchar sec
, min
, hour
, mday
, wday
, mon_cent
, year
;
49 sec
= rtc_read (0x02);
50 min
= rtc_read (0x03);
51 hour
= rtc_read (0x04);
52 mday
= rtc_read (0x05);
53 wday
= rtc_read (0x06);
54 mon_cent
= rtc_read (0x07);
55 year
= rtc_read (0x08);
57 debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
58 "hr: %02x min: %02x sec: %02x\n",
59 year
, mon_cent
, mday
, wday
,
61 debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
68 puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
72 tmp
->tm_sec
= bcd2bin (sec
& 0x7F);
73 tmp
->tm_min
= bcd2bin (min
& 0x7F);
74 tmp
->tm_hour
= bcd2bin (hour
& 0x3F);
75 tmp
->tm_mday
= bcd2bin (mday
& 0x3F);
76 tmp
->tm_mon
= bcd2bin (mon_cent
& 0x1F);
77 tmp
->tm_year
= bcd2bin (year
) + ((mon_cent
& 0x80) ? 2000 : 1900);
78 tmp
->tm_wday
= bcd2bin (wday
& 0x07);
82 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
83 tmp
->tm_year
, tmp
->tm_mon
, tmp
->tm_mday
, tmp
->tm_wday
,
84 tmp
->tm_hour
, tmp
->tm_min
, tmp
->tm_sec
);
89 void rtc_set (struct rtc_time
*tmp
)
93 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
94 tmp
->tm_year
, tmp
->tm_mon
, tmp
->tm_mday
, tmp
->tm_wday
,
95 tmp
->tm_hour
, tmp
->tm_min
, tmp
->tm_sec
);
97 rtc_write (0x08, bin2bcd(tmp
->tm_year
% 100));
99 century
= (tmp
->tm_year
>= 2000) ? 0x80 : 0;
100 rtc_write (0x07, bin2bcd(tmp
->tm_mon
) | century
);
102 rtc_write (0x06, bin2bcd(tmp
->tm_wday
));
103 rtc_write (0x05, bin2bcd(tmp
->tm_mday
));
104 rtc_write (0x04, bin2bcd(tmp
->tm_hour
));
105 rtc_write (0x03, bin2bcd(tmp
->tm_min
));
106 rtc_write (0x02, bin2bcd(tmp
->tm_sec
));
109 void rtc_reset (void)
111 /* clear all control & status registers */
112 rtc_write (0x00, 0x00);
113 rtc_write (0x01, 0x00);
114 rtc_write (0x0D, 0x00);
116 /* clear Voltage Low bit */
117 rtc_write (0x02, rtc_read (0x02) & 0x7F);
119 /* reset all alarms */
120 rtc_write (0x09, 0x00);
121 rtc_write (0x0A, 0x00);
122 rtc_write (0x0B, 0x00);
123 rtc_write (0x0C, 0x00);
126 /* ------------------------------------------------------------------------- */
128 static uchar
rtc_read (uchar reg
)
130 return (i2c_reg_read (CFG_I2C_RTC_ADDR
, reg
));
133 static void rtc_write (uchar reg
, uchar val
)
135 i2c_reg_write (CFG_I2C_RTC_ADDR
, reg
, val
);
138 static unsigned bcd2bin (uchar n
)
140 return ((((n
>> 4) & 0x0F) * 10) + (n
& 0x0F));
143 static unsigned char bin2bcd (unsigned int n
)
145 return (((n
/ 10) << 4) | (n
% 10));