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wdenk4c0d4c32004-06-09 17:34:58 +00001/*
2 * (C) Copyright 2004
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
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.
12 *
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.
17 *
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,
21 * MA 02111-1307 USA
22 */
23
24/*
25 * Date & Time support for MAXIM MAX6900 RTC
26 */
27
28/* #define DEBUG */
29
30#include <common.h>
31#include <command.h>
32#include <rtc.h>
33#include <i2c.h>
34
Michal Simek871c18d2008-07-14 19:45:37 +020035#if defined(CONFIG_CMD_DATE)
wdenk4c0d4c32004-06-09 17:34:58 +000036
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020037#ifndef CONFIG_SYS_I2C_RTC_ADDR
38#define CONFIG_SYS_I2C_RTC_ADDR 0x50
wdenk4c0d4c32004-06-09 17:34:58 +000039#endif
40
41/* ------------------------------------------------------------------------- */
42
43static uchar rtc_read (uchar reg)
44{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020045 return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
wdenk4c0d4c32004-06-09 17:34:58 +000046}
47
48static void rtc_write (uchar reg, uchar val)
49{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020050 i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
wdenk4c0d4c32004-06-09 17:34:58 +000051 udelay(2500);
52}
53
wdenk4c0d4c32004-06-09 17:34:58 +000054/* ------------------------------------------------------------------------- */
55
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030056int rtc_get (struct rtc_time *tmp)
wdenk4c0d4c32004-06-09 17:34:58 +000057{
58 uchar sec, min, hour, mday, wday, mon, cent, year;
59 int retry = 1;
60
61 do {
62 sec = rtc_read (0x80);
63 min = rtc_read (0x82);
64 hour = rtc_read (0x84);
65 mday = rtc_read (0x86);
66 mon = rtc_read (0x88);
67 wday = rtc_read (0x8a);
68 year = rtc_read (0x8c);
69 cent = rtc_read (0x92);
70 /*
71 * Check for seconds rollover
72 */
73 if ((sec != 59) || (rtc_read(0x80) == sec)){
74 retry = 0;
75 }
76 } while (retry);
77
78 debug ( "Get RTC year: %02x mon: %02x cent: %02x mday: %02x wday: %02x "
79 "hr: %02x min: %02x sec: %02x\n",
80 year, mon, cent, mday, wday,
81 hour, min, sec );
82
83 tmp->tm_sec = bcd2bin (sec & 0x7F);
84 tmp->tm_min = bcd2bin (min & 0x7F);
85 tmp->tm_hour = bcd2bin (hour & 0x3F);
86 tmp->tm_mday = bcd2bin (mday & 0x3F);
87 tmp->tm_mon = bcd2bin (mon & 0x1F);
88 tmp->tm_year = bcd2bin (year) + bcd2bin(cent) * 100;
89 tmp->tm_wday = bcd2bin (wday & 0x07);
90 tmp->tm_yday = 0;
91 tmp->tm_isdst= 0;
92
93 debug ( "Get 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);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030096
97 return 0;
wdenk4c0d4c32004-06-09 17:34:58 +000098}
99
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200100int rtc_set (struct rtc_time *tmp)
wdenk4c0d4c32004-06-09 17:34:58 +0000101{
102
103 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
104 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
105 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
106
107 rtc_write (0x9E, 0x00);
108 rtc_write (0x80, 0); /* Clear seconds to ensure no rollover */
109 rtc_write (0x92, bin2bcd(tmp->tm_year / 100));
110 rtc_write (0x8c, bin2bcd(tmp->tm_year % 100));
111 rtc_write (0x8a, bin2bcd(tmp->tm_wday));
112 rtc_write (0x88, bin2bcd(tmp->tm_mon));
113 rtc_write (0x86, bin2bcd(tmp->tm_mday));
114 rtc_write (0x84, bin2bcd(tmp->tm_hour));
115 rtc_write (0x82, bin2bcd(tmp->tm_min ));
116 rtc_write (0x80, bin2bcd(tmp->tm_sec ));
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200117
118 return 0;
wdenk4c0d4c32004-06-09 17:34:58 +0000119}
120
121void rtc_reset (void)
122{
123}
124
Jon Loeliger068b60a2007-07-10 10:27:39 -0500125#endif