1 /* 2 * (C) Copyright 2002 3 * ARIO Data Networks, Inc. dchiu@ariodata.com 4 * 5 * modified for DS1556: 6 * Frank Panno <fpanno@delphintech.com>, Delphin Technology AG 7 * 8 * Based on MontaVista DS1743 code and U-Boot mc146818 code 9 * 10 * See file CREDITS for list of people who contributed to this 11 * project. 12 * 13 * This program is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU General Public License as 15 * published by the Free Software Foundation; either version 2 of 16 * the License, or (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 26 * MA 02111-1307 USA 27 */ 28 29 /* 30 * Date & Time support for the DS1556 RTC 31 */ 32 33 /*#define RTC_DEBUG */ 34 35 #include <common.h> 36 #include <command.h> 37 #include <rtc.h> 38 39 #if defined(CONFIG_CMD_DATE) 40 41 static uchar rtc_read( unsigned int addr ); 42 static void rtc_write( unsigned int addr, uchar val); 43 44 #define RTC_BASE ( CONFIG_SYS_NVRAM_SIZE + CONFIG_SYS_NVRAM_BASE_ADDR ) 45 46 #define RTC_YEAR ( RTC_BASE + 0xf ) 47 #define RTC_MONTH ( RTC_BASE + 0xe ) 48 #define RTC_DAY_OF_MONTH ( RTC_BASE + 0xd ) 49 #define RTC_DAY_OF_WEEK ( RTC_BASE + 0xc ) 50 #define RTC_HOURS ( RTC_BASE + 0xb ) 51 #define RTC_MINUTES ( RTC_BASE + 0xa ) 52 #define RTC_SECONDS ( RTC_BASE + 0x9 ) 53 #define RTC_CENTURY ( RTC_BASE + 0x8 ) 54 55 #define RTC_CONTROLA RTC_CENTURY 56 #define RTC_CONTROLB RTC_SECONDS 57 #define RTC_CONTROLC RTC_BASE 58 59 #define RTC_CA_WRITE 0x80 60 #define RTC_CA_READ 0x40 61 62 #define RTC_CB_OSC_DISABLE 0x80 63 64 #define RTC_CC_BATTERY_FLAG 0x10 65 #define RTC_CC_FREQ_TEST 0x40 66 67 /* ------------------------------------------------------------------------- */ 68 69 int rtc_get( struct rtc_time *tmp ) 70 { 71 uchar sec, min, hour; 72 uchar mday, wday, mon, year; 73 74 int century; 75 76 uchar reg_a; 77 78 reg_a = rtc_read( RTC_CONTROLA ); 79 /* lock clock registers for read */ 80 rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_READ )); 81 82 sec = rtc_read( RTC_SECONDS ); 83 min = rtc_read( RTC_MINUTES ); 84 hour = rtc_read( RTC_HOURS ); 85 mday = rtc_read( RTC_DAY_OF_MONTH ); 86 wday = rtc_read( RTC_DAY_OF_WEEK ); 87 mon = rtc_read( RTC_MONTH ); 88 year = rtc_read( RTC_YEAR ); 89 century = rtc_read( RTC_CENTURY ); 90 91 /* unlock clock registers after read */ 92 rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ )); 93 94 #ifdef RTC_DEBUG 95 printf( "Get RTC year: %02x mon/cent: %02x mon: %02x mday: %02x wday: %02x " 96 "hr: %02x min: %02x sec: %02x\n", 97 year, century, mon, mday, wday, 98 hour, min, sec ); 99 #endif 100 tmp->tm_sec = bcd2bin( sec & 0x7F ); 101 tmp->tm_min = bcd2bin( min & 0x7F ); 102 tmp->tm_hour = bcd2bin( hour & 0x3F ); 103 tmp->tm_mday = bcd2bin( mday & 0x3F ); 104 tmp->tm_mon = bcd2bin( mon & 0x1F ); 105 tmp->tm_wday = bcd2bin( wday & 0x07 ); 106 107 /* glue year from century and year in century */ 108 tmp->tm_year = bcd2bin( year ) + 109 ( bcd2bin( century & 0x3F ) * 100 ); 110 111 tmp->tm_yday = 0; 112 tmp->tm_isdst= 0; 113 #ifdef RTC_DEBUG 114 printf( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 115 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 116 tmp->tm_hour, tmp->tm_min, tmp->tm_sec ); 117 #endif 118 return 0; 119 } 120 121 int rtc_set( struct rtc_time *tmp ) 122 { 123 uchar reg_a; 124 #ifdef RTC_DEBUG 125 printf( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 126 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 127 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 128 #endif 129 /* lock clock registers for write */ 130 reg_a = rtc_read( RTC_CONTROLA ); 131 rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_WRITE )); 132 133 rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon )); 134 135 rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday )); 136 rtc_write( RTC_DAY_OF_MONTH, bin2bcd( tmp->tm_mday )); 137 rtc_write( RTC_HOURS, bin2bcd( tmp->tm_hour )); 138 rtc_write( RTC_MINUTES, bin2bcd( tmp->tm_min )); 139 rtc_write( RTC_SECONDS, bin2bcd( tmp->tm_sec )); 140 141 /* break year up into century and year in century */ 142 rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 )); 143 rtc_write( RTC_CENTURY, bin2bcd( tmp->tm_year / 100 )); 144 145 /* unlock clock registers after read */ 146 rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE )); 147 148 return 0; 149 } 150 151 void rtc_reset (void) 152 { 153 uchar reg_a, reg_b, reg_c; 154 155 reg_a = rtc_read( RTC_CONTROLA ); 156 reg_b = rtc_read( RTC_CONTROLB ); 157 158 if ( reg_b & RTC_CB_OSC_DISABLE ) 159 { 160 printf( "real-time-clock was stopped. Now starting...\n" ); 161 reg_a |= RTC_CA_WRITE; 162 reg_b &= ~RTC_CB_OSC_DISABLE; 163 164 rtc_write( RTC_CONTROLA, reg_a ); 165 rtc_write( RTC_CONTROLB, reg_b ); 166 } 167 168 /* make sure read/write clock register bits are cleared */ 169 reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ ); 170 rtc_write( RTC_CONTROLA, reg_a ); 171 172 reg_c = rtc_read( RTC_CONTROLC ); 173 if (( reg_c & RTC_CC_BATTERY_FLAG ) == 0 ) 174 printf( "RTC battery low. Clock setting may not be reliable.\n" ); 175 } 176 177 /* ------------------------------------------------------------------------- */ 178 179 static uchar rtc_read( unsigned int addr ) 180 { 181 uchar val = *(volatile unsigned char*)(addr); 182 #ifdef RTC_DEBUG 183 printf( "rtc_read: %x:%x\n", addr, val ); 184 #endif 185 return( val ); 186 } 187 188 static void rtc_write( unsigned int addr, uchar val ) 189 { 190 #ifdef RTC_DEBUG 191 printf( "rtc_write: %x:%x\n", addr, val ); 192 #endif 193 *(volatile unsigned char*)(addr) = val; 194 } 195 196 #endif 197