uboot-phytec

// SPDX-License-Identifier: GPL-2.0+

/*

 * (C) Copyright 2001

 * ARIO Data Networks, Inc. dchiu@ariodata.com

 *

 * Based on MontaVista DS1743 code and U-Boot mc146818 code

 */

​

/*

 * Date & Time support for the DS174x RTC

 */

​

/*#define   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 + 7 )

#define RTC_MONTH       ( RTC_BASE + 6 )

#define RTC_DAY_OF_MONTH    ( RTC_BASE + 5 )

#define RTC_DAY_OF_WEEK     ( RTC_BASE + 4 )

#define RTC_HOURS       ( RTC_BASE + 3 )

#define RTC_MINUTES     ( RTC_BASE + 2 )

#define RTC_SECONDS     ( RTC_BASE + 1 )

#define RTC_CENTURY     ( RTC_BASE + 0 )

​

#define RTC_CONTROLA        RTC_CENTURY

#define RTC_CONTROLB        RTC_SECONDS

#define RTC_CONTROLC        RTC_DAY_OF_WEEK

​

#define RTC_CA_WRITE        0x80

#define RTC_CA_READ     0x40

​

#define RTC_CB_OSC_DISABLE  0x80

​

#define RTC_CC_BATTERY_FLAG 0x80

#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 mday: %02x wday: %02x "

        "hr: %02x min: %02x sec: %02x\n",

        year, mon_cent, 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;