uboot-phytec

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

/*

 * (C) Copyright 2001, 2002, 2003

 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.

 * Keith Outwater, keith_outwater@mvis.com`

 * Steven Scholz, steven.scholz@imc-berlin.de

 */

​

/*

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

 * DS1374 Real Time Clock (RTC).

 *

 * based on ds1337.c

 */

​

#include <common.h>

#include <command.h>

#include <rtc.h>

#include <i2c.h>

​

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

#undef DEBUG_RTC

#define DEBUG_RTC

​

#ifdef DEBUG_RTC

#define DEBUGR(fmt,args...) printf(fmt ,##args)

#else

#define DEBUGR(fmt,args...)

#endif

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

​

#ifndef CONFIG_SYS_I2C_RTC_ADDR

# define CONFIG_SYS_I2C_RTC_ADDR    0x68

#endif

​

#if defined(CONFIG_RTC_DS1374) && (CONFIG_SYS_I2C_SPEED > 400000)

# error The DS1374 is specified up to 400kHz in fast mode!

#endif

​

/*

 * RTC register addresses

 */

#define RTC_TOD_CNT_BYTE0_ADDR      0x00 /* TimeOfDay */

#define RTC_TOD_CNT_BYTE1_ADDR      0x01

#define RTC_TOD_CNT_BYTE2_ADDR      0x02

#define RTC_TOD_CNT_BYTE3_ADDR      0x03

​

#define RTC_WD_ALM_CNT_BYTE0_ADDR   0x04

#define RTC_WD_ALM_CNT_BYTE1_ADDR   0x05

#define RTC_WD_ALM_CNT_BYTE2_ADDR   0x06

​

#define RTC_CTL_ADDR            0x07 /* RTC-CoNTrol-register */

#define RTC_SR_ADDR         0x08 /* RTC-StatusRegister */

#define RTC_TCS_DS_ADDR         0x09 /* RTC-TrickleChargeSelect DiodeSelect-register */

​

#define RTC_CTL_BIT_AIE         (1<<0) /* Bit 0 - Alarm Interrupt enable */

#define RTC_CTL_BIT_RS1         (1<<1) /* Bit 1/2 - Rate Select square wave output */

#define RTC_CTL_BIT_RS2         (1<<2) /* Bit 2/2 - Rate Select square wave output */

#define RTC_CTL_BIT_WDSTR       (1<<3) /* Bit 3 - Watchdog Reset Steering */

#define RTC_CTL_BIT_BBSQW       (1<<4) /* Bit 4 - Battery-Backed Square-Wave */

#define RTC_CTL_BIT_WD_ALM      (1<<5) /* Bit 5 - Watchdoc/Alarm Counter Select */

#define RTC_CTL_BIT_WACE        (1<<6) /* Bit 6 - Watchdog/Alarm Counter Enable WACE*/

#define RTC_CTL_BIT_EN_OSC      (1<<7) /* Bit 7 - Enable Oscilator */