uboot-phytec

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

/*

 * (C) Copyright 2002

 * Andrew May, Viasat Inc, amay@viasat.com

 */

​

/*

 * M41T11 Serial Access Timekeeper(R) SRAM

 * can you believe a trademark on that?

 */

​

/* #define DEBUG 1 */

​

#include <common.h>

#include <command.h>

#include <rtc.h>

#include <i2c.h>

​

/*

    I Don't have an example config file but this

    is what should be done.

​

#define CONFIG_RTC_M41T11 1

#define CONFIG_SYS_I2C_RTC_ADDR 0x68

#if 0

#define CONFIG_SYS_M41T11_EXT_CENTURY_DATA

#else

#define CONFIG_SYS_M41T11_BASE_YEAR 2000

#endif

*/

​

#if defined(CONFIG_SYS_I2C_RTC_ADDR) && defined(CONFIG_CMD_DATE)

​

/* ------------------------------------------------------------------------- */

/*

  these are simple defines for the chip local to here so they aren't too

  verbose

  DAY/DATE aren't nice but that is how they are on the data sheet

*/

#define RTC_SEC_ADDR       0x0

#define RTC_MIN_ADDR       0x1

#define RTC_HOUR_ADDR      0x2

#define RTC_DAY_ADDR       0x3

#define RTC_DATE_ADDR      0x4

#define RTC_MONTH_ADDR     0x5

#define RTC_YEARS_ADDR     0x6

​

#define RTC_REG_CNT        7

​

#define RTC_CONTROL_ADDR   0x7

​

​

#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA

​

#define REG_CNT            (RTC_REG_CNT+1)

​

/*

  you only get 00-99 for the year we will asume you

  want from the year 2000 if you don't set the config

*/

#ifndef CONFIG_SYS_M41T11_BASE_YEAR

#define CONFIG_SYS_M41T11_BASE_YEAR 2000

#endif

​

#else

/* we will store extra year info in byte 9*/

#define M41T11_YEAR_DATA   0x8

#define M41T11_YEAR_SIZE   1

#define REG_CNT            (RTC_REG_CNT+1+M41T11_YEAR_SIZE)

#endif

​

#define M41T11_STORAGE_SZ  (64-REG_CNT)

​

int rtc_get (struct rtc_time *tmp)

{

    int rel = 0;

    uchar data[RTC_REG_CNT];

​

    i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT);

​

    if( data[RTC_SEC_ADDR] & 0x80 ){

        printf( "m41t11 RTC Clock stopped!!!\n" );

        rel = -1;

    }

    tmp->tm_sec  = bcd2bin (data[RTC_SEC_ADDR]  & 0x7F);

    tmp->tm_min  = bcd2bin (data[RTC_MIN_ADDR]  & 0x7F);

    tmp->tm_hour = bcd2bin (data[RTC_HOUR_ADDR] & 0x3F);

    tmp->tm_mday = bcd2bin (data[RTC_DATE_ADDR] & 0x3F);

    tmp->tm_mon  = bcd2bin (data[RTC_MONTH_ADDR]& 0x1F);

#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA

    tmp->tm_year = CONFIG_SYS_M41T11_BASE_YEAR

        + bcd2bin(data[RTC_YEARS_ADDR])