mirror of
https://github.com/AsahiLinux/u-boot
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5d88902401
The EFI subsystem accesses the real time clock and is enabled by default. So we should drop any CONFIG_CMD_DATE dependency from the real time clock drivers. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Alexander Graf <agraf@suse.de>
172 lines
4.4 KiB
C
172 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2001
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* ARIO Data Networks, Inc. dchiu@ariodata.com
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*
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* Based on MontaVista DS1743 code and U-Boot mc146818 code
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*/
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/*
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* Date & Time support for the DS174x RTC
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*/
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/*#define DEBUG*/
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#include <common.h>
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#include <command.h>
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#include <rtc.h>
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static uchar rtc_read( unsigned int addr );
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static void rtc_write( unsigned int addr, uchar val);
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#define RTC_BASE ( CONFIG_SYS_NVRAM_SIZE + CONFIG_SYS_NVRAM_BASE_ADDR )
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#define RTC_YEAR ( RTC_BASE + 7 )
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#define RTC_MONTH ( RTC_BASE + 6 )
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#define RTC_DAY_OF_MONTH ( RTC_BASE + 5 )
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#define RTC_DAY_OF_WEEK ( RTC_BASE + 4 )
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#define RTC_HOURS ( RTC_BASE + 3 )
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#define RTC_MINUTES ( RTC_BASE + 2 )
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#define RTC_SECONDS ( RTC_BASE + 1 )
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#define RTC_CENTURY ( RTC_BASE + 0 )
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#define RTC_CONTROLA RTC_CENTURY
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#define RTC_CONTROLB RTC_SECONDS
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#define RTC_CONTROLC RTC_DAY_OF_WEEK
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#define RTC_CA_WRITE 0x80
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#define RTC_CA_READ 0x40
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#define RTC_CB_OSC_DISABLE 0x80
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#define RTC_CC_BATTERY_FLAG 0x80
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#define RTC_CC_FREQ_TEST 0x40
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/* ------------------------------------------------------------------------- */
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int rtc_get( struct rtc_time *tmp )
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{
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uchar sec, min, hour;
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uchar mday, wday, mon, year;
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int century;
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uchar reg_a;
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reg_a = rtc_read( RTC_CONTROLA );
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/* lock clock registers for read */
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rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_READ ));
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sec = rtc_read( RTC_SECONDS );
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min = rtc_read( RTC_MINUTES );
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hour = rtc_read( RTC_HOURS );
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mday = rtc_read( RTC_DAY_OF_MONTH );
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wday = rtc_read( RTC_DAY_OF_WEEK );
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mon = rtc_read( RTC_MONTH );
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year = rtc_read( RTC_YEAR );
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century = rtc_read( RTC_CENTURY );
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/* unlock clock registers after read */
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rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
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#ifdef RTC_DEBUG
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printf( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
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"hr: %02x min: %02x sec: %02x\n",
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year, mon_cent, mday, wday,
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hour, min, sec );
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#endif
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tmp->tm_sec = bcd2bin( sec & 0x7F );
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tmp->tm_min = bcd2bin( min & 0x7F );
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tmp->tm_hour = bcd2bin( hour & 0x3F );
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tmp->tm_mday = bcd2bin( mday & 0x3F );
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tmp->tm_mon = bcd2bin( mon & 0x1F );
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tmp->tm_wday = bcd2bin( wday & 0x07 );
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/* glue year from century and year in century */
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tmp->tm_year = bcd2bin( year ) +
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( bcd2bin( century & 0x3F ) * 100 );
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tmp->tm_yday = 0;
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tmp->tm_isdst= 0;
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#ifdef RTC_DEBUG
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printf( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec );
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#endif
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return 0;
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}
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int rtc_set( struct rtc_time *tmp )
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{
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uchar reg_a;
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#ifdef RTC_DEBUG
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printf( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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#endif
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/* lock clock registers for write */
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reg_a = rtc_read( RTC_CONTROLA );
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rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_WRITE ));
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rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));
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rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday ));
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rtc_write( RTC_DAY_OF_MONTH, bin2bcd( tmp->tm_mday ));
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rtc_write( RTC_HOURS, bin2bcd( tmp->tm_hour ));
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rtc_write( RTC_MINUTES, bin2bcd( tmp->tm_min ));
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rtc_write( RTC_SECONDS, bin2bcd( tmp->tm_sec ));
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/* break year up into century and year in century */
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rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
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rtc_write( RTC_CENTURY, bin2bcd( tmp->tm_year / 100 ));
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/* unlock clock registers after read */
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rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
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return 0;
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}
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void rtc_reset (void)
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{
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uchar reg_a, reg_b, reg_c;
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reg_a = rtc_read( RTC_CONTROLA );
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reg_b = rtc_read( RTC_CONTROLB );
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if ( reg_b & RTC_CB_OSC_DISABLE )
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{
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printf( "real-time-clock was stopped. Now starting...\n" );
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reg_a |= RTC_CA_WRITE;
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reg_b &= ~RTC_CB_OSC_DISABLE;
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rtc_write( RTC_CONTROLA, reg_a );
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rtc_write( RTC_CONTROLB, reg_b );
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}
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/* make sure read/write clock register bits are cleared */
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reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ );
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rtc_write( RTC_CONTROLA, reg_a );
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reg_c = rtc_read( RTC_CONTROLC );
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if (( reg_c & RTC_CC_BATTERY_FLAG ) == 0 )
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printf( "RTC battery low. Clock setting may not be reliable.\n" );
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}
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/* ------------------------------------------------------------------------- */
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static uchar rtc_read( unsigned int addr )
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{
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uchar val = in8( addr );
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#ifdef RTC_DEBUG
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printf( "rtc_read: %x:%x\n", addr, val );
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#endif
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return( val );
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}
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static void rtc_write( unsigned int addr, uchar val )
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{
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#ifdef RTC_DEBUG
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printf( "rtc_write: %x:%x\n", addr, val );
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#endif
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out8( addr, val );
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}
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