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