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 CONFIG_SYS_I2C_RTC_ADDR 0x68 39 #if 0 40 #define CONFIG_SYS_M41T11_EXT_CENTURY_DATA 41 #else 42 #define CONFIG_SYS_M41T11_BASE_YEAR 2000 43 #endif 44 */ 45 46 #if defined(CONFIG_SYS_I2C_RTC_ADDR) && defined(CONFIG_CMD_DATE) 47 48 /* ------------------------------------------------------------------------- */ 49 /* 50 these are simple defines for the chip local to here so they aren't too 51 verbose 52 DAY/DATE aren't nice but that is how they are on the data sheet 53 */ 54 #define RTC_SEC_ADDR 0x0 55 #define RTC_MIN_ADDR 0x1 56 #define RTC_HOUR_ADDR 0x2 57 #define RTC_DAY_ADDR 0x3 58 #define RTC_DATE_ADDR 0x4 59 #define RTC_MONTH_ADDR 0x5 60 #define RTC_YEARS_ADDR 0x6 61 62 #define RTC_REG_CNT 7 63 64 #define RTC_CONTROL_ADDR 0x7 65 66 67 #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA 68 69 #define REG_CNT (RTC_REG_CNT+1) 70 71 /* 72 you only get 00-99 for the year we will asume you 73 want from the year 2000 if you don't set the config 74 */ 75 #ifndef CONFIG_SYS_M41T11_BASE_YEAR 76 #define CONFIG_SYS_M41T11_BASE_YEAR 2000 77 #endif 78 79 #else 80 /* we will store extra year info in byte 9*/ 81 #define M41T11_YEAR_DATA 0x8 82 #define M41T11_YEAR_SIZE 1 83 #define REG_CNT (RTC_REG_CNT+1+M41T11_YEAR_SIZE) 84 #endif 85 86 #define M41T11_STORAGE_SZ (64-REG_CNT) 87 88 int rtc_get (struct rtc_time *tmp) 89 { 90 int rel = 0; 91 uchar data[RTC_REG_CNT]; 92 93 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); 94 95 if( data[RTC_SEC_ADDR] & 0x80 ){ 96 printf( "m41t11 RTC Clock stopped!!!\n" ); 97 rel = -1; 98 } 99 tmp->tm_sec = bcd2bin (data[RTC_SEC_ADDR] & 0x7F); 100 tmp->tm_min = bcd2bin (data[RTC_MIN_ADDR] & 0x7F); 101 tmp->tm_hour = bcd2bin (data[RTC_HOUR_ADDR] & 0x3F); 102 tmp->tm_mday = bcd2bin (data[RTC_DATE_ADDR] & 0x3F); 103 tmp->tm_mon = bcd2bin (data[RTC_MONTH_ADDR]& 0x1F); 104 #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA 105 tmp->tm_year = CONFIG_SYS_M41T11_BASE_YEAR 106 + bcd2bin(data[RTC_YEARS_ADDR]) 107 + ((data[RTC_HOUR_ADDR]&0x40) ? 100 : 0); 108 #else 109 { 110 unsigned char cent; 111 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); 112 if( !(data[RTC_HOUR_ADDR] & 0x80) ){ 113 printf( "m41t11 RTC: cann't keep track of years without CEB set\n" ); 114 rel = -1; 115 } 116 if( (cent & 0x1) != ((data[RTC_HOUR_ADDR]&0x40)>>7) ){ 117 /*century flip store off new year*/ 118 cent += 1; 119 i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); 120 } 121 tmp->tm_year =((int)cent*100)+bcd2bin(data[RTC_YEARS_ADDR]); 122 } 123 #endif 124 tmp->tm_wday = bcd2bin (data[RTC_DAY_ADDR] & 0x07); 125 tmp->tm_yday = 0; 126 tmp->tm_isdst= 0; 127 128 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 129 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 130 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 131 132 return rel; 133 } 134 135 int rtc_set (struct rtc_time *tmp) 136 { 137 uchar data[RTC_REG_CNT]; 138 139 debug ( "Set 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 data[RTC_SEC_ADDR] = bin2bcd(tmp->tm_sec) & 0x7F;/*just in case*/ 144 data[RTC_MIN_ADDR] = bin2bcd(tmp->tm_min); 145 data[RTC_HOUR_ADDR] = bin2bcd(tmp->tm_hour) & 0x3F;/*handle cent stuff later*/ 146 data[RTC_DATE_ADDR] = bin2bcd(tmp->tm_mday) & 0x3F; 147 data[RTC_MONTH_ADDR] = bin2bcd(tmp->tm_mon); 148 data[RTC_DAY_ADDR] = bin2bcd(tmp->tm_wday) & 0x07; 149 150 data[RTC_HOUR_ADDR] |= 0x80;/*we will always use CEB*/ 151 152 data[RTC_YEARS_ADDR] = bin2bcd(tmp->tm_year%100);/*same thing either way*/ 153 #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA 154 if( ((tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 200) || 155 (tmp->tm_year < CONFIG_SYS_M41T11_BASE_YEAR) ){ 156 printf( "m41t11 RTC setting year out of range!!need recompile\n" ); 157 } 158 data[RTC_HOUR_ADDR] |= (tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 100 ? 0x40 : 0; 159 #else 160 { 161 unsigned char cent; 162 cent = tmp->tm_year ? tmp->tm_year / 100 : 0; 163 data[RTC_HOUR_ADDR] |= (cent & 0x1) ? 0x40 : 0; 164 i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); 165 } 166 #endif 167 i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); 168 169 return 0; 170 } 171 172 void rtc_reset (void) 173 { 174 unsigned char val; 175 /* clear all control & status registers */ 176 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, 1); 177 val = val & 0x7F;/*make sure we are running*/ 178 i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, RTC_REG_CNT); 179 180 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); 181 val = val & 0x3F;/*turn off freq test keep calibration*/ 182 i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); 183 } 184 185 int rtc_store(int addr, unsigned char* data, int size) 186 { 187 /*don't let things wrap onto the time on a write*/ 188 if( (addr+size) >= M41T11_STORAGE_SZ ) 189 return 1; 190 return i2c_write( CONFIG_SYS_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size ); 191 } 192 193 int rtc_recall(int addr, unsigned char* data, int size) 194 { 195 return i2c_read( CONFIG_SYS_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size ); 196 } 197 198 #endif 199