1 /* 2 * (C) Copyright 2002 3 * Andrew May, Viasat Inc, amay@viasat.com 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* 9 * M41T11 Serial Access Timekeeper(R) SRAM 10 * can you believe a trademark on that? 11 */ 12 13 /* #define DEBUG 1 */ 14 15 #include <common.h> 16 #include <command.h> 17 #include <rtc.h> 18 #include <i2c.h> 19 20 /* 21 I Don't have an example config file but this 22 is what should be done. 23 24 #define CONFIG_RTC_M41T11 1 25 #define CONFIG_SYS_I2C_RTC_ADDR 0x68 26 #if 0 27 #define CONFIG_SYS_M41T11_EXT_CENTURY_DATA 28 #else 29 #define CONFIG_SYS_M41T11_BASE_YEAR 2000 30 #endif 31 */ 32 33 #if defined(CONFIG_SYS_I2C_RTC_ADDR) && defined(CONFIG_CMD_DATE) 34 35 /* ------------------------------------------------------------------------- */ 36 /* 37 these are simple defines for the chip local to here so they aren't too 38 verbose 39 DAY/DATE aren't nice but that is how they are on the data sheet 40 */ 41 #define RTC_SEC_ADDR 0x0 42 #define RTC_MIN_ADDR 0x1 43 #define RTC_HOUR_ADDR 0x2 44 #define RTC_DAY_ADDR 0x3 45 #define RTC_DATE_ADDR 0x4 46 #define RTC_MONTH_ADDR 0x5 47 #define RTC_YEARS_ADDR 0x6 48 49 #define RTC_REG_CNT 7 50 51 #define RTC_CONTROL_ADDR 0x7 52 53 54 #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA 55 56 #define REG_CNT (RTC_REG_CNT+1) 57 58 /* 59 you only get 00-99 for the year we will asume you 60 want from the year 2000 if you don't set the config 61 */ 62 #ifndef CONFIG_SYS_M41T11_BASE_YEAR 63 #define CONFIG_SYS_M41T11_BASE_YEAR 2000 64 #endif 65 66 #else 67 /* we will store extra year info in byte 9*/ 68 #define M41T11_YEAR_DATA 0x8 69 #define M41T11_YEAR_SIZE 1 70 #define REG_CNT (RTC_REG_CNT+1+M41T11_YEAR_SIZE) 71 #endif 72 73 #define M41T11_STORAGE_SZ (64-REG_CNT) 74 75 int rtc_get (struct rtc_time *tmp) 76 { 77 int rel = 0; 78 uchar data[RTC_REG_CNT]; 79 80 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); 81 82 if( data[RTC_SEC_ADDR] & 0x80 ){ 83 printf( "m41t11 RTC Clock stopped!!!\n" ); 84 rel = -1; 85 } 86 tmp->tm_sec = bcd2bin (data[RTC_SEC_ADDR] & 0x7F); 87 tmp->tm_min = bcd2bin (data[RTC_MIN_ADDR] & 0x7F); 88 tmp->tm_hour = bcd2bin (data[RTC_HOUR_ADDR] & 0x3F); 89 tmp->tm_mday = bcd2bin (data[RTC_DATE_ADDR] & 0x3F); 90 tmp->tm_mon = bcd2bin (data[RTC_MONTH_ADDR]& 0x1F); 91 #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA 92 tmp->tm_year = CONFIG_SYS_M41T11_BASE_YEAR 93 + bcd2bin(data[RTC_YEARS_ADDR]) 94 + ((data[RTC_HOUR_ADDR]&0x40) ? 100 : 0); 95 #else 96 { 97 unsigned char cent; 98 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); 99 if( !(data[RTC_HOUR_ADDR] & 0x80) ){ 100 printf( "m41t11 RTC: cann't keep track of years without CEB set\n" ); 101 rel = -1; 102 } 103 if( (cent & 0x1) != ((data[RTC_HOUR_ADDR]&0x40)>>7) ){ 104 /*century flip store off new year*/ 105 cent += 1; 106 i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); 107 } 108 tmp->tm_year =((int)cent*100)+bcd2bin(data[RTC_YEARS_ADDR]); 109 } 110 #endif 111 tmp->tm_wday = bcd2bin (data[RTC_DAY_ADDR] & 0x07); 112 tmp->tm_yday = 0; 113 tmp->tm_isdst= 0; 114 115 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 116 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 117 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 118 119 return rel; 120 } 121 122 int rtc_set (struct rtc_time *tmp) 123 { 124 uchar data[RTC_REG_CNT]; 125 126 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 127 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 128 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 129 130 data[RTC_SEC_ADDR] = bin2bcd(tmp->tm_sec) & 0x7F;/*just in case*/ 131 data[RTC_MIN_ADDR] = bin2bcd(tmp->tm_min); 132 data[RTC_HOUR_ADDR] = bin2bcd(tmp->tm_hour) & 0x3F;/*handle cent stuff later*/ 133 data[RTC_DATE_ADDR] = bin2bcd(tmp->tm_mday) & 0x3F; 134 data[RTC_MONTH_ADDR] = bin2bcd(tmp->tm_mon); 135 data[RTC_DAY_ADDR] = bin2bcd(tmp->tm_wday) & 0x07; 136 137 data[RTC_HOUR_ADDR] |= 0x80;/*we will always use CEB*/ 138 139 data[RTC_YEARS_ADDR] = bin2bcd(tmp->tm_year%100);/*same thing either way*/ 140 #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA 141 if( ((tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 200) || 142 (tmp->tm_year < CONFIG_SYS_M41T11_BASE_YEAR) ){ 143 printf( "m41t11 RTC setting year out of range!!need recompile\n" ); 144 } 145 data[RTC_HOUR_ADDR] |= (tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 100 ? 0x40 : 0; 146 #else 147 { 148 unsigned char cent; 149 cent = tmp->tm_year ? tmp->tm_year / 100 : 0; 150 data[RTC_HOUR_ADDR] |= (cent & 0x1) ? 0x40 : 0; 151 i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); 152 } 153 #endif 154 i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); 155 156 return 0; 157 } 158 159 void rtc_reset (void) 160 { 161 unsigned char val; 162 /* clear all control & status registers */ 163 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, 1); 164 val = val & 0x7F;/*make sure we are running*/ 165 i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, RTC_REG_CNT); 166 167 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); 168 val = val & 0x3F;/*turn off freq test keep calibration*/ 169 i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); 170 } 171 #endif 172