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u-boot/drivers/rtc/ds1556.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
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>
2018-05-07 09:34:12 -04:00

179 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2002
* ARIO Data Networks, Inc. dchiu@ariodata.com
*
* modified for DS1556:
* Frank Panno <fpanno@delphintech.com>, Delphin Technology AG
*
* Based on MontaVista DS1743 code and U-Boot mc146818 code
*/
/*
* Date & Time support for the DS1556 RTC
*/
/*#define RTC_DEBUG */
#include <common.h>
#include <command.h>
#include <rtc.h>
#if defined(CONFIG_CMD_DATE)
static uchar rtc_read( unsigned int addr );
static void rtc_write( unsigned int addr, uchar val);
#define RTC_BASE ( CONFIG_SYS_NVRAM_SIZE + CONFIG_SYS_NVRAM_BASE_ADDR )
#define RTC_YEAR ( RTC_BASE + 0xf )
#define RTC_MONTH ( RTC_BASE + 0xe )
#define RTC_DAY_OF_MONTH ( RTC_BASE + 0xd )
#define RTC_DAY_OF_WEEK ( RTC_BASE + 0xc )
#define RTC_HOURS ( RTC_BASE + 0xb )
#define RTC_MINUTES ( RTC_BASE + 0xa )
#define RTC_SECONDS ( RTC_BASE + 0x9 )
#define RTC_CENTURY ( RTC_BASE + 0x8 )
#define RTC_CONTROLA RTC_CENTURY
#define RTC_CONTROLB RTC_SECONDS
#define RTC_CONTROLC RTC_BASE
#define RTC_CA_WRITE 0x80
#define RTC_CA_READ 0x40
#define RTC_CB_OSC_DISABLE 0x80
#define RTC_CC_BATTERY_FLAG 0x10
#define RTC_CC_FREQ_TEST 0x40
/* ------------------------------------------------------------------------- */
int 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 mon: %02x mday: %02x wday: %02x "
"hr: %02x min: %02x sec: %02x\n",
year, century, mon, 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
return 0;
}
int 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 ));
return 0;
}
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 = *(volatile unsigned char*)(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
*(volatile unsigned char*)(addr) = val;
}
#endif
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