mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
175 lines
4.4 KiB
C
175 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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/*
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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_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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#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 ( CONFIG_SYS_NVRAM_BASE_ADDR + CONFIG_SYS_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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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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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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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 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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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;
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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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#endif
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