uboot-phytec

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

/*

 * (C) Copyright 2006

 * Markus Klotzbuecher, mk@denx.de

 */

​

/*

 * Date & Time support (no alarms) for Dallas Semiconductor (now Maxim)

 * Extremly Accurate DS3231 Real Time Clock (RTC).

 *

 * copied from ds1337.c

 */

​

#include <common.h>

#include <command.h>

#include <rtc.h>

#include <i2c.h>

​

#if defined(CONFIG_CMD_DATE)

​

/*

 * RTC register addresses

 */

#define RTC_SEC_REG_ADDR    0x0

#define RTC_MIN_REG_ADDR    0x1

#define RTC_HR_REG_ADDR     0x2

#define RTC_DAY_REG_ADDR    0x3

#define RTC_DATE_REG_ADDR   0x4

#define RTC_MON_REG_ADDR    0x5

#define RTC_YR_REG_ADDR     0x6

#define RTC_CTL_REG_ADDR    0x0e

#define RTC_STAT_REG_ADDR   0x0f

​

​

/*

 * RTC control register bits

 */

#define RTC_CTL_BIT_A1IE    0x1 /* Alarm 1 interrupt enable     */

#define RTC_CTL_BIT_A2IE    0x2 /* Alarm 2 interrupt enable     */

#define RTC_CTL_BIT_INTCN   0x4 /* Interrupt control            */

#define RTC_CTL_BIT_RS1     0x8 /* Rate select 1                */

#define RTC_CTL_BIT_RS2     0x10    /* Rate select 2                */

#define RTC_CTL_BIT_DOSC    0x80    /* Disable Oscillator           */

​

/*

 * RTC status register bits

 */

#define RTC_STAT_BIT_A1F    0x1 /* Alarm 1 flag                 */

#define RTC_STAT_BIT_A2F    0x2 /* Alarm 2 flag                 */

#define RTC_STAT_BIT_OSF    0x80    /* Oscillator stop flag         */

#define RTC_STAT_BIT_BB32KHZ    0x40    /* Battery backed 32KHz Output  */

#define RTC_STAT_BIT_EN32KHZ    0x8 /* Enable 32KHz Output  */

​

​

static uchar rtc_read (uchar reg);

static void rtc_write (uchar reg, uchar val);

​

​

/*

 * Get the current time from the RTC

 */

int rtc_get (struct rtc_time *tmp)

{