diff options
Diffstat (limited to 'rtc/ds174x.c')
| -rw-r--r-- | rtc/ds174x.c | 202 |
1 files changed, 0 insertions, 202 deletions
diff --git a/rtc/ds174x.c b/rtc/ds174x.c deleted file mode 100644 index 5f85a68..0000000 --- a/rtc/ds174x.c +++ /dev/null @@ -1,202 +0,0 @@ -/* - * (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 |