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wdenkaffae2b2002-08-17 09:36:01 +00001/*
2 * (C) Copyright 2002
3 * Andrew May, Viasat Inc, amay@viasat.com
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of
8 * the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
18 * MA 02111-1307 USA
19 */
20
21/*
22 * M41T11 Serial Access Timekeeper(R) SRAM
23 * can you believe a trademark on that?
24 */
25
26#include <common.h>
27#include <command.h>
28#include <rtc.h>
29#include <i2c.h>
30
31/*
32 I Don't have an example config file but this
33 is what should be done.
34
35#define CONFIG_RTC_M41T11 1
36#define CFG_I2C_RTC_ADDR 0x68
37#if 0
38#define CFG_M41T11_EXT_CENTURY_DATA
39#else
40#define CFG_M41T11_BASE_YEAR 2000
41#endif
42*/
43
44#if defined(CONFIG_RTC_M41T11) && defined(CFG_I2C_RTC_ADDR) && (CONFIG_COMMANDS & CFG_CMD_DATE)
45
46#define DEBUG 1
47
48static unsigned bcd2bin (uchar n)
49{
50 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
51}
52
53static unsigned char bin2bcd (unsigned int n)
54{
55 return (((n / 10) << 4) | (n % 10));
56}
57
58
59/* ------------------------------------------------------------------------- */
60/*
61 these are simple defines for the chip local to here so they aren't too
62 verbose
63 DAY/DATE aren't nice but that is how they are on the data sheet
64*/
65#define RTC_SEC_ADDR 0x0
66#define RTC_MIN_ADDR 0x1
67#define RTC_HOUR_ADDR 0x2
68#define RTC_DAY_ADDR 0x3
69#define RTC_DATE_ADDR 0x4
70#define RTC_MONTH_ADDR 0x5
71#define RTC_YEARS_ADDR 0x6
72
73#define RTC_REG_CNT 7
74
75#define RTC_CONTROL_ADDR 0x7
76
77
78#ifndef CFG_M41T11_EXT_CENTURY_DATA
79
80#define REG_CNT (RTC_REG_CNT+1)
81
82/*
83 you only get 00-99 for the year we will asume you
84 want from the year 2000 if you don't set the config
85*/
86#ifndef CFG_M41T11_BASE_YEAR
87#define CFG_M41T11_BASE_YEAR 2000
88#endif
89
90#else
91/* we will store extra year info in byte 9*/
92#define M41T11_YEAR_DATA 0x8
93#define M41T11_YEAR_SIZE 1
94#define REG_CNT (RTC_REG_CNT+1+M41T11_YEAR_SIZE)
95#endif
96
97#define M41T11_STORAGE_SZ (64-REG_CNT)
98
99void rtc_get (struct rtc_time *tmp)
100{
wdenk8bde7f72003-06-27 21:31:46 +0000101 uchar data[RTC_REG_CNT];
wdenkaffae2b2002-08-17 09:36:01 +0000102
wdenk8bde7f72003-06-27 21:31:46 +0000103 i2c_read(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT);
wdenkaffae2b2002-08-17 09:36:01 +0000104
wdenk8bde7f72003-06-27 21:31:46 +0000105 if( data[RTC_SEC_ADDR] & 0x80 ){
106 printf( "m41t11 RTC Clock stopped!!!\n" );
107 }
wdenkaffae2b2002-08-17 09:36:01 +0000108 tmp->tm_sec = bcd2bin (data[RTC_SEC_ADDR] & 0x7F);
109 tmp->tm_min = bcd2bin (data[RTC_MIN_ADDR] & 0x7F);
110 tmp->tm_hour = bcd2bin (data[RTC_HOUR_ADDR] & 0x3F);
111 tmp->tm_mday = bcd2bin (data[RTC_DATE_ADDR] & 0x3F);
112 tmp->tm_mon = bcd2bin (data[RTC_MONTH_ADDR]& 0x1F);
113#ifndef CFG_M41T11_EXT_CENTURY_DATA
wdenk8bde7f72003-06-27 21:31:46 +0000114 tmp->tm_year = CFG_M41T11_BASE_YEAR
115 + bcd2bin(data[RTC_YEARS_ADDR])
116 + ((data[RTC_HOUR_ADDR]&0x40) ? 100 : 0);
wdenkaffae2b2002-08-17 09:36:01 +0000117#else
wdenk8bde7f72003-06-27 21:31:46 +0000118 {
119 unsigned char cent;
120 i2c_read(CFG_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, &cent, M41T11_YEAR_SIZE);
121 if( !(data[RTC_HOUR_ADDR] & 0x80) ){
122 printf( "m41t11 RTC: cann't keep track of years without CEB set\n" );
123 }
124 if( (cent & 0x1) != ((data[RTC_HOUR_ADDR]&0x40)>>7) ){
125 /*century flip store off new year*/
126 cent += 1;
127 i2c_write(CFG_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, &cent, M41T11_YEAR_SIZE);
128 }
129 tmp->tm_year =((int)cent*100)+bcd2bin(data[RTC_YEARS_ADDR]);
130 }
wdenkaffae2b2002-08-17 09:36:01 +0000131#endif
132 tmp->tm_wday = bcd2bin (data[RTC_DAY_ADDR] & 0x07);
133 tmp->tm_yday = 0;
134 tmp->tm_isdst= 0;
135
136 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
137 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
138 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
139}
140
141void rtc_set (struct rtc_time *tmp)
142{
wdenk8bde7f72003-06-27 21:31:46 +0000143 uchar data[RTC_REG_CNT];
wdenkaffae2b2002-08-17 09:36:01 +0000144
145 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
146 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
147 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
148
149 data[RTC_SEC_ADDR] = bin2bcd(tmp->tm_sec) & 0x7F;/*just in case*/
150 data[RTC_MIN_ADDR] = bin2bcd(tmp->tm_min);
151 data[RTC_HOUR_ADDR] = bin2bcd(tmp->tm_hour) & 0x3F;/*handle cent stuff later*/
152 data[RTC_DATE_ADDR] = bin2bcd(tmp->tm_mday) & 0x3F;
153 data[RTC_MONTH_ADDR] = bin2bcd(tmp->tm_mon);
154 data[RTC_DAY_ADDR] = bin2bcd(tmp->tm_wday) & 0x07;
155
wdenk8bde7f72003-06-27 21:31:46 +0000156 data[RTC_HOUR_ADDR] |= 0x80;/*we will always use CEB*/
wdenkaffae2b2002-08-17 09:36:01 +0000157
wdenk8bde7f72003-06-27 21:31:46 +0000158 data[RTC_YEARS_ADDR] = bin2bcd(tmp->tm_year%100);/*same thing either way*/
wdenkaffae2b2002-08-17 09:36:01 +0000159#ifndef CFG_M41T11_EXT_CENTURY_DATA
wdenk8bde7f72003-06-27 21:31:46 +0000160 if( ((tmp->tm_year - CFG_M41T11_BASE_YEAR) > 200) ||
161 (tmp->tm_year < CFG_M41T11_BASE_YEAR) ){
162 printf( "m41t11 RTC setting year out of range!!need recompile\n" );
163 }
164 data[RTC_HOUR_ADDR] |= (tmp->tm_year - CFG_M41T11_BASE_YEAR) > 100 ? 0x40 : 0;
wdenkaffae2b2002-08-17 09:36:01 +0000165#else
wdenk8bde7f72003-06-27 21:31:46 +0000166 {
167 unsigned char cent;
168 cent = tmp->tm_year ? tmp->tm_year / 100 : 0;
169 data[RTC_HOUR_ADDR] |= (cent & 0x1) ? 0x40 : 0;
170 i2c_write(CFG_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, &cent, M41T11_YEAR_SIZE);
171 }
wdenkaffae2b2002-08-17 09:36:01 +0000172#endif
wdenk8bde7f72003-06-27 21:31:46 +0000173 i2c_write(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT);
wdenkaffae2b2002-08-17 09:36:01 +0000174}
175
176void rtc_reset (void)
177{
wdenk8bde7f72003-06-27 21:31:46 +0000178 unsigned char val;
wdenkaffae2b2002-08-17 09:36:01 +0000179 /* clear all control & status registers */
wdenk8bde7f72003-06-27 21:31:46 +0000180 i2c_read(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, 1);
181 val = val & 0x7F;/*make sure we are running*/
182 i2c_write(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, RTC_REG_CNT);
wdenkaffae2b2002-08-17 09:36:01 +0000183
wdenk8bde7f72003-06-27 21:31:46 +0000184 i2c_read(CFG_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1);
185 val = val & 0x3F;/*turn off freq test keep calibration*/
186 i2c_write(CFG_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1);
wdenkaffae2b2002-08-17 09:36:01 +0000187}
188
189int rtc_store(int addr, unsigned char* data, int size)
190{
wdenk8bde7f72003-06-27 21:31:46 +0000191 /*don't let things wrap onto the time on a write*/
192 if( (addr+size) >= M41T11_STORAGE_SZ )
193 return 1;
194 return i2c_write( CFG_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size );
wdenkaffae2b2002-08-17 09:36:01 +0000195}
196
197int rtc_recall(int addr, unsigned char* data, int size)
198{
wdenk8bde7f72003-06-27 21:31:46 +0000199 return i2c_read( CFG_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size );
wdenkaffae2b2002-08-17 09:36:01 +0000200}
201
202#endif /* CONFIG_RTC_M41T11 && CFG_I2C_RTC_ADDR && CFG_CMD_DATE */