upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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200 lines
5.4 KiB
200 lines
5.4 KiB
/*
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* (C) Copyright 2002
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* ARIO Data Networks, Inc. dchiu@ariodata.com
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*
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* modified for DS164x:
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* The LEOX team <team@leox.org>, http://www.leox.org
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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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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* Date & Time support for the DS164x RTC
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*/
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/* #define RTC_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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#if defined(CONFIG_RTC_DS164x) && defined(CONFIG_CMD_DATE)
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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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static uchar bin2bcd(unsigned int n);
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static unsigned bcd2bin(uchar c);
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#define RTC_EPOCH 2000 /* century */
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/*
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* DS164x registers layout
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*/
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#define RTC_BASE ( CFG_NVRAM_BASE_ADDR + CFG_NVRAM_SIZE )
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#define RTC_YEAR ( RTC_BASE + 0x07 )
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#define RTC_MONTH ( RTC_BASE + 0x06 )
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#define RTC_DAY_OF_MONTH ( RTC_BASE + 0x05 )
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#define RTC_DAY_OF_WEEK ( RTC_BASE + 0x04 )
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#define RTC_HOURS ( RTC_BASE + 0x03 )
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#define RTC_MINUTES ( RTC_BASE + 0x02 )
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#define RTC_SECONDS ( RTC_BASE + 0x01 )
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#define RTC_CONTROL ( RTC_BASE + 0x00 )
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#define RTC_CONTROLA RTC_CONTROL /* W=bit6, R=bit5 */
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#define RTC_CA_WRITE 0x80
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#define RTC_CA_READ 0x40
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#define RTC_CONTROLB RTC_SECONDS /* OSC=bit7 */
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#define RTC_CB_OSC_DISABLE 0x80
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#define RTC_CONTROLC RTC_DAY_OF_WEEK /* FT=bit6 */
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#define RTC_CC_FREQ_TEST 0x40
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/* ------------------------------------------------------------------------- */
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void 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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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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/* 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: %02x mday: %02x wday: %02x "
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"hr: %02x min: %02x sec: %02x\n",
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year, mon, 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 in century (2000) */
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tmp->tm_year = bcd2bin( year ) + RTC_EPOCH;
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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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}
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void 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 in century */
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rtc_write( RTC_YEAR, 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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}
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void rtc_reset (void)
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{
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uchar reg_a, reg_b;
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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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}
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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 = *(volatile unsigned char*)(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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*(volatile unsigned char*)(addr) = val;
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}
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static unsigned bcd2bin (uchar n)
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{
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return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
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}
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static unsigned char bin2bcd (unsigned int n)
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{
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return (((n / 10) << 4) | (n % 10));
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}
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#endif
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