+++ /dev/null
-/*
- * (C) Copyright 2001
- * ARIO Data Networks, Inc. dchiu@ariodata.com
- *
- * Based on MontaVista DS1743 code and U-Boot mc146818 code
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * 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
- */
-
-/*
- * Date & Time support for the DS174x RTC
- */
-
-/*#define DEBUG*/
-
-#include <common.h>
-#include <command.h>
-#include <rtc.h>
-
-#if defined(CONFIG_RTC_DS174x) && defined(CONFIG_CMD_DATE)
-
-static uchar rtc_read( unsigned int addr );
-static void rtc_write( unsigned int addr, uchar val);
-static uchar bin2bcd (unsigned int n);
-static unsigned bcd2bin(uchar c);
-
-#define RTC_BASE ( CFG_NVRAM_SIZE + CFG_NVRAM_BASE_ADDR )
-
-#define RTC_YEAR ( RTC_BASE + 7 )
-#define RTC_MONTH ( RTC_BASE + 6 )
-#define RTC_DAY_OF_MONTH ( RTC_BASE + 5 )
-#define RTC_DAY_OF_WEEK ( RTC_BASE + 4 )
-#define RTC_HOURS ( RTC_BASE + 3 )
-#define RTC_MINUTES ( RTC_BASE + 2 )
-#define RTC_SECONDS ( RTC_BASE + 1 )
-#define RTC_CENTURY ( RTC_BASE + 0 )
-
-#define RTC_CONTROLA RTC_CENTURY
-#define RTC_CONTROLB RTC_SECONDS
-#define RTC_CONTROLC RTC_DAY_OF_WEEK
-
-#define RTC_CA_WRITE 0x80
-#define RTC_CA_READ 0x40
-
-#define RTC_CB_OSC_DISABLE 0x80
-
-#define RTC_CC_BATTERY_FLAG 0x80
-#define RTC_CC_FREQ_TEST 0x40
-
-/* ------------------------------------------------------------------------- */
-
-void rtc_get( struct rtc_time *tmp )
-{
- uchar sec, min, hour;
- uchar mday, wday, mon, year;
-
- int century;
-
- uchar reg_a;
-
- reg_a = rtc_read( RTC_CONTROLA );
- /* lock clock registers for read */
- rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_READ ));
-
- sec = rtc_read( RTC_SECONDS );
- min = rtc_read( RTC_MINUTES );
- hour = rtc_read( RTC_HOURS );
- mday = rtc_read( RTC_DAY_OF_MONTH );
- wday = rtc_read( RTC_DAY_OF_WEEK );
- mon = rtc_read( RTC_MONTH );
- year = rtc_read( RTC_YEAR );
- century = rtc_read( RTC_CENTURY );
-
- /* unlock clock registers after read */
- rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
-
-#ifdef RTC_DEBUG
- printf( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
- "hr: %02x min: %02x sec: %02x\n",
- year, mon_cent, mday, wday,
- hour, min, sec );
-#endif
- tmp->tm_sec = bcd2bin( sec & 0x7F );
- tmp->tm_min = bcd2bin( min & 0x7F );
- tmp->tm_hour = bcd2bin( hour & 0x3F );
- tmp->tm_mday = bcd2bin( mday & 0x3F );
- tmp->tm_mon = bcd2bin( mon & 0x1F );
- tmp->tm_wday = bcd2bin( wday & 0x07 );
-
- /* glue year from century and year in century */
- tmp->tm_year = bcd2bin( year ) +
- ( bcd2bin( century & 0x3F ) * 100 );
-
- tmp->tm_yday = 0;
- tmp->tm_isdst= 0;
-#ifdef RTC_DEBUG
- printf( "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 );
-#endif
-}
-
-void rtc_set( struct rtc_time *tmp )
-{
- uchar reg_a;
-#ifdef RTC_DEBUG
- printf( "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);
-#endif
- /* lock clock registers for write */
- reg_a = rtc_read( RTC_CONTROLA );
- rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_WRITE ));
-
- rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));
-
- rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday ));
- rtc_write( RTC_DAY_OF_MONTH, bin2bcd( tmp->tm_mday ));
- rtc_write( RTC_HOURS, bin2bcd( tmp->tm_hour ));
- rtc_write( RTC_MINUTES, bin2bcd( tmp->tm_min ));
- rtc_write( RTC_SECONDS, bin2bcd( tmp->tm_sec ));
-
- /* break year up into century and year in century */
- rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
- rtc_write( RTC_CENTURY, bin2bcd( tmp->tm_year / 100 ));
-
- /* unlock clock registers after read */
- rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
-}
-
-void rtc_reset (void)
-{
- uchar reg_a, reg_b, reg_c;
-
- reg_a = rtc_read( RTC_CONTROLA );
- reg_b = rtc_read( RTC_CONTROLB );
-
- if ( reg_b & RTC_CB_OSC_DISABLE )
- {
- printf( "real-time-clock was stopped. Now starting...\n" );
- reg_a |= RTC_CA_WRITE;
- reg_b &= ~RTC_CB_OSC_DISABLE;
-
- rtc_write( RTC_CONTROLA, reg_a );
- rtc_write( RTC_CONTROLB, reg_b );
- }
-
- /* make sure read/write clock register bits are cleared */
- reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ );
- rtc_write( RTC_CONTROLA, reg_a );
-
- reg_c = rtc_read( RTC_CONTROLC );
- if (( reg_c & RTC_CC_BATTERY_FLAG ) == 0 )
- printf( "RTC battery low. Clock setting may not be reliable.\n" );
-}
-
-/* ------------------------------------------------------------------------- */
-
-static uchar rtc_read( unsigned int addr )
-{
- uchar val = in8( addr );
-#ifdef RTC_DEBUG
- printf( "rtc_read: %x:%x\n", addr, val );
-#endif
- return( val );
-}
-
-static void rtc_write( unsigned int addr, uchar val )
-{
-#ifdef RTC_DEBUG
- printf( "rtc_write: %x:%x\n", addr, val );
-#endif
- out8( addr, val );
-}
-
-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));
-}
-
-#endif
projects / karo-tx-uboot.git / blobdiff