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.
104 lines
2.5 KiB
104 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
|
/* |
|
* (C) Copyright 2004 |
|
* Wolfgang Denk, DENX Software Engineering, [email protected]. |
|
*/ |
|
|
|
/* |
|
* Date & Time support for MAXIM MAX6900 RTC |
|
*/ |
|
|
|
/* #define DEBUG */ |
|
|
|
#include <common.h> |
|
#include <command.h> |
|
#include <rtc.h> |
|
#include <i2c.h> |
|
|
|
#ifndef CONFIG_SYS_I2C_RTC_ADDR |
|
#define CONFIG_SYS_I2C_RTC_ADDR 0x50 |
|
#endif |
|
|
|
/* ------------------------------------------------------------------------- */ |
|
|
|
static uchar rtc_read (uchar reg) |
|
{ |
|
return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg)); |
|
} |
|
|
|
static void rtc_write (uchar reg, uchar val) |
|
{ |
|
i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val); |
|
udelay(2500); |
|
} |
|
|
|
/* ------------------------------------------------------------------------- */ |
|
|
|
int rtc_get (struct rtc_time *tmp) |
|
{ |
|
uchar sec, min, hour, mday, wday, mon, cent, year; |
|
int retry = 1; |
|
|
|
do { |
|
sec = rtc_read (0x80); |
|
min = rtc_read (0x82); |
|
hour = rtc_read (0x84); |
|
mday = rtc_read (0x86); |
|
mon = rtc_read (0x88); |
|
wday = rtc_read (0x8a); |
|
year = rtc_read (0x8c); |
|
cent = rtc_read (0x92); |
|
/* |
|
* Check for seconds rollover |
|
*/ |
|
if ((sec != 59) || (rtc_read(0x80) == sec)){ |
|
retry = 0; |
|
} |
|
} while (retry); |
|
|
|
debug ( "Get RTC year: %02x mon: %02x cent: %02x mday: %02x wday: %02x " |
|
"hr: %02x min: %02x sec: %02x\n", |
|
year, mon, cent, mday, wday, |
|
hour, min, sec ); |
|
|
|
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_year = bcd2bin (year) + bcd2bin(cent) * 100; |
|
tmp->tm_wday = bcd2bin (wday & 0x07); |
|
tmp->tm_yday = 0; |
|
tmp->tm_isdst= 0; |
|
|
|
debug ( "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); |
|
|
|
return 0; |
|
} |
|
|
|
int rtc_set (struct rtc_time *tmp) |
|
{ |
|
|
|
debug ( "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); |
|
|
|
rtc_write (0x9E, 0x00); |
|
rtc_write (0x80, 0); /* Clear seconds to ensure no rollover */ |
|
rtc_write (0x92, bin2bcd(tmp->tm_year / 100)); |
|
rtc_write (0x8c, bin2bcd(tmp->tm_year % 100)); |
|
rtc_write (0x8a, bin2bcd(tmp->tm_wday)); |
|
rtc_write (0x88, bin2bcd(tmp->tm_mon)); |
|
rtc_write (0x86, bin2bcd(tmp->tm_mday)); |
|
rtc_write (0x84, bin2bcd(tmp->tm_hour)); |
|
rtc_write (0x82, bin2bcd(tmp->tm_min )); |
|
rtc_write (0x80, bin2bcd(tmp->tm_sec )); |
|
|
|
return 0; |
|
} |
|
|
|
void rtc_reset (void) |
|
{ |
|
}
|
|
|