/* * (C) Copyright 2002 * Andrew May, Viasat Inc, amay@viasat.com * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ /* * M41T11 Serial Access Timekeeper(R) SRAM * can you believe a trademark on that? */ /* #define DEBUG 1 */ #include <common.h> #include <command.h> #include <rtc.h> #include <i2c.h> /* I Don't have an example config file but this is what should be done. #define CONFIG_RTC_M41T11 1 #define CFG_I2C_RTC_ADDR 0x68 #if 0 #define CFG_M41T11_EXT_CENTURY_DATA #else #define CFG_M41T11_BASE_YEAR 2000 #endif */ #if defined(CONFIG_RTC_M41T11) && defined(CFG_I2C_RTC_ADDR) && defined(CONFIG_CMD_DATE) static unsigned bcd2bin (uchar n) { return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); } static unsigned char bin2bcd (unsigned int n) { return (((n / 10) << 4) | (n % 10)); } /* ------------------------------------------------------------------------- */ /* these are simple defines for the chip local to here so they aren't too verbose DAY/DATE aren't nice but that is how they are on the data sheet */ #define RTC_SEC_ADDR 0x0 #define RTC_MIN_ADDR 0x1 #define RTC_HOUR_ADDR 0x2 #define RTC_DAY_ADDR 0x3 #define RTC_DATE_ADDR 0x4 #define RTC_MONTH_ADDR 0x5 #define RTC_YEARS_ADDR 0x6 #define RTC_REG_CNT 7 #define RTC_CONTROL_ADDR 0x7 #ifndef CFG_M41T11_EXT_CENTURY_DATA #define REG_CNT (RTC_REG_CNT+1) /* you only get 00-99 for the year we will asume you want from the year 2000 if you don't set the config */ #ifndef CFG_M41T11_BASE_YEAR #define CFG_M41T11_BASE_YEAR 2000 #endif #else /* we will store extra year info in byte 9*/ #define M41T11_YEAR_DATA 0x8 #define M41T11_YEAR_SIZE 1 #define REG_CNT (RTC_REG_CNT+1+M41T11_YEAR_SIZE) #endif #define M41T11_STORAGE_SZ (64-REG_CNT) void rtc_get (struct rtc_time *tmp) { uchar data[RTC_REG_CNT]; i2c_read(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); if( data[RTC_SEC_ADDR] & 0x80 ){ printf( "m41t11 RTC Clock stopped!!!\n" ); } tmp->tm_sec = bcd2bin (data[RTC_SEC_ADDR] & 0x7F); tmp->tm_min = bcd2bin (data[RTC_MIN_ADDR] & 0x7F); tmp->tm_hour = bcd2bin (data[RTC_HOUR_ADDR] & 0x3F); tmp->tm_mday = bcd2bin (data[RTC_DATE_ADDR] & 0x3F); tmp->tm_mon = bcd2bin (data[RTC_MONTH_ADDR]& 0x1F); #ifndef CFG_M41T11_EXT_CENTURY_DATA tmp->tm_year = CFG_M41T11_BASE_YEAR + bcd2bin(data[RTC_YEARS_ADDR]) + ((data[RTC_HOUR_ADDR]&0x40) ? 100 : 0); #else { unsigned char cent; i2c_read(CFG_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); if( !(data[RTC_HOUR_ADDR] & 0x80) ){ printf( "m41t11 RTC: cann't keep track of years without CEB set\n" ); } if( (cent & 0x1) != ((data[RTC_HOUR_ADDR]&0x40)>>7) ){ /*century flip store off new year*/ cent += 1; i2c_write(CFG_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); } tmp->tm_year =((int)cent*100)+bcd2bin(data[RTC_YEARS_ADDR]); } #endif tmp->tm_wday = bcd2bin (data[RTC_DAY_ADDR] & 0x07); tmp->tm_yday = 0; tmp->tm_isdst= 0; debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); } void rtc_set (struct rtc_time *tmp) { uchar data[RTC_REG_CNT]; debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); data[RTC_SEC_ADDR] = bin2bcd(tmp->tm_sec) & 0x7F;/*just in case*/ data[RTC_MIN_ADDR] = bin2bcd(tmp->tm_min); data[RTC_HOUR_ADDR] = bin2bcd(tmp->tm_hour) & 0x3F;/*handle cent stuff later*/ data[RTC_DATE_ADDR] = bin2bcd(tmp->tm_mday) & 0x3F; data[RTC_MONTH_ADDR] = bin2bcd(tmp->tm_mon); data[RTC_DAY_ADDR] = bin2bcd(tmp->tm_wday) & 0x07; data[RTC_HOUR_ADDR] |= 0x80;/*we will always use CEB*/ data[RTC_YEARS_ADDR] = bin2bcd(tmp->tm_year%100);/*same thing either way*/ #ifndef CFG_M41T11_EXT_CENTURY_DATA if( ((tmp->tm_year - CFG_M41T11_BASE_YEAR) > 200) || (tmp->tm_year < CFG_M41T11_BASE_YEAR) ){ printf( "m41t11 RTC setting year out of range!!need recompile\n" ); } data[RTC_HOUR_ADDR] |= (tmp->tm_year - CFG_M41T11_BASE_YEAR) > 100 ? 0x40 : 0; #else { unsigned char cent; cent = tmp->tm_year ? tmp->tm_year / 100 : 0; data[RTC_HOUR_ADDR] |= (cent & 0x1) ? 0x40 : 0; i2c_write(CFG_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); } #endif i2c_write(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); } void rtc_reset (void) { unsigned char val; /* clear all control & status registers */ i2c_read(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, 1); val = val & 0x7F;/*make sure we are running*/ i2c_write(CFG_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, RTC_REG_CNT); i2c_read(CFG_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); val = val & 0x3F;/*turn off freq test keep calibration*/ i2c_write(CFG_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); } int rtc_store(int addr, unsigned char* data, int size) { /*don't let things wrap onto the time on a write*/ if( (addr+size) >= M41T11_STORAGE_SZ ) return 1; return i2c_write( CFG_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size ); } int rtc_recall(int addr, unsigned char* data, int size) { return i2c_read( CFG_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size ); } #endif