forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
179 lines
4.6 KiB
179 lines
4.6 KiB
// SPDX-License-Identifier: GPL-2.0+ |
|
/* |
|
* (C) Copyright 2002 |
|
* ARIO Data Networks, Inc. [email protected] |
|
* |
|
* modified for DS1556: |
|
* Frank Panno <[email protected]>, 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
|
|
|