1 /* 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 /* #define DEBUG 1 */ 27 28 #include <common.h> 29 #include <command.h> 30 #include <rtc.h> 31 #include <i2c.h> 32 33 /* 34 I Don't have an example config file but this 35 is what should be done. 36 37 #define CONFIG_RTC_M41T11 1 38 #define CFG_I2C_RTC_ADDR 0x68 39 #if 0 40 #define CFG_M41T11_EXT_CENTURY_DATA 41 #else 42 #define CFG_M41T11_BASE_YEAR 2000 43 #endif 44 */ 45 46 #if defined(CFG_I2C_RTC_ADDR) && defined(CONFIG_CMD_DATE) 47 48 static unsigned bcd2bin (uchar n) 49 { 50 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); 51 } 52 53 static 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 99 int rtc_get (struct rtc_time *tmp) 100 { 101 int rel = 0; 102 uchar data[RTC_REG_CNT]; 103 104 i2c_read(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); 105 106 if( data[RTC_SEC_ADDR] & 0x80 ){ 107 printf( "m41t11 RTC Clock stopped!!!\n" ); 108 rel = -1; 109 } 110 tmp->tm_sec = bcd2bin (data[RTC_SEC_ADDR] & 0x7F); 111 tmp->tm_min = bcd2bin (data[RTC_MIN_ADDR] & 0x7F); 112 tmp->tm_hour = bcd2bin (data[RTC_HOUR_ADDR] & 0x3F); 113 tmp->tm_mday = bcd2bin (data[RTC_DATE_ADDR] & 0x3F); 114 tmp->tm_mon = bcd2bin (data[RTC_MONTH_ADDR]& 0x1F); 115 #ifndef CFG_M41T11_EXT_CENTURY_DATA 116 tmp->tm_year = CFG_M41T11_BASE_YEAR 117 + bcd2bin(data[RTC_YEARS_ADDR]) 118 + ((data[RTC_HOUR_ADDR]&0x40) ? 100 : 0); 119 #else 120 { 121 unsigned char cent; 122 i2c_read(CFG_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); 123 if( !(data[RTC_HOUR_ADDR] & 0x80) ){ 124 printf( "m41t11 RTC: cann't keep track of years without CEB set\n" ); 125 rel = -1; 126 } 127 if( (cent & 0x1) != ((data[RTC_HOUR_ADDR]&0x40)>>7) ){ 128 /*century flip store off new year*/ 129 cent += 1; 130 i2c_write(CFG_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); 131 } 132 tmp->tm_year =((int)cent*100)+bcd2bin(data[RTC_YEARS_ADDR]); 133 } 134 #endif 135 tmp->tm_wday = bcd2bin (data[RTC_DAY_ADDR] & 0x07); 136 tmp->tm_yday = 0; 137 tmp->tm_isdst= 0; 138 139 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 140 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 141 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 142 143 return rel; 144 } 145 146 int rtc_set (struct rtc_time *tmp) 147 { 148 uchar data[RTC_REG_CNT]; 149 150 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 151 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 152 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 153 154 data[RTC_SEC_ADDR] = bin2bcd(tmp->tm_sec) & 0x7F;/*just in case*/ 155 data[RTC_MIN_ADDR] = bin2bcd(tmp->tm_min); 156 data[RTC_HOUR_ADDR] = bin2bcd(tmp->tm_hour) & 0x3F;/*handle cent stuff later*/ 157 data[RTC_DATE_ADDR] = bin2bcd(tmp->tm_mday) & 0x3F; 158 data[RTC_MONTH_ADDR] = bin2bcd(tmp->tm_mon); 159 data[RTC_DAY_ADDR] = bin2bcd(tmp->tm_wday) & 0x07; 160 161 data[RTC_HOUR_ADDR] |= 0x80;/*we will always use CEB*/ 162 163 data[RTC_YEARS_ADDR] = bin2bcd(tmp->tm_year%100);/*same thing either way*/ 164 #ifndef CFG_M41T11_EXT_CENTURY_DATA 165 if( ((tmp->tm_year - CFG_M41T11_BASE_YEAR) > 200) || 166 (tmp->tm_year < CFG_M41T11_BASE_YEAR) ){ 167 printf( "m41t11 RTC setting year out of range!!need recompile\n" ); 168 } 169 data[RTC_HOUR_ADDR] |= (tmp->tm_year - CFG_M41T11_BASE_YEAR) > 100 ? 0x40 : 0; 170 #else 171 { 172 unsigned char cent; 173 cent = tmp->tm_year ? tmp->tm_year / 100 : 0; 174 data[RTC_HOUR_ADDR] |= (cent & 0x1) ? 0x40 : 0; 175 i2c_write(CFG_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); 176 } 177 #endif 178 i2c_write(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); 179 180 return 0; 181 } 182 183 void rtc_reset (void) 184 { 185 unsigned char val; 186 /* clear all control & status registers */ 187 i2c_read(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, 1); 188 val = val & 0x7F;/*make sure we are running*/ 189 i2c_write(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, RTC_REG_CNT); 190 191 i2c_read(CFG_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); 192 val = val & 0x3F;/*turn off freq test keep calibration*/ 193 i2c_write(CFG_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); 194 } 195 196 int rtc_store(int addr, unsigned char* data, int size) 197 { 198 /*don't let things wrap onto the time on a write*/ 199 if( (addr+size) >= M41T11_STORAGE_SZ ) 200 return 1; 201 return i2c_write( CFG_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size ); 202 } 203 204 int rtc_recall(int addr, unsigned char* data, int size) 205 { 206 return i2c_read( CFG_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size ); 207 } 208 209 #endif 210