mirror of
https://github.com/brain-hackers/u-boot-brain
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
218 lines
5.8 KiB
C
218 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2001, 2002, 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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* Keith Outwater, keith_outwater@mvis.com`
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* Steven Scholz, steven.scholz@imc-berlin.de
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*/
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/*
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* Date & Time support (no alarms) for Dallas Semiconductor (now Maxim)
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* DS1374 Real Time Clock (RTC).
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*
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* based on ds1337.c
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*/
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#include <common.h>
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#include <command.h>
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#include <rtc.h>
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#include <i2c.h>
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#if defined(CONFIG_CMD_DATE)
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/*---------------------------------------------------------------------*/
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#undef DEBUG_RTC
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#define DEBUG_RTC
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#ifdef DEBUG_RTC
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#define DEBUGR(fmt,args...) printf(fmt ,##args)
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#else
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#define DEBUGR(fmt,args...)
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#endif
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/*---------------------------------------------------------------------*/
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#ifndef CONFIG_SYS_I2C_RTC_ADDR
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# define CONFIG_SYS_I2C_RTC_ADDR 0x68
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#endif
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#if defined(CONFIG_RTC_DS1374) && (CONFIG_SYS_I2C_SPEED > 400000)
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# error The DS1374 is specified up to 400kHz in fast mode!
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#endif
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/*
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* RTC register addresses
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*/
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#define RTC_TOD_CNT_BYTE0_ADDR 0x00 /* TimeOfDay */
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#define RTC_TOD_CNT_BYTE1_ADDR 0x01
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#define RTC_TOD_CNT_BYTE2_ADDR 0x02
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#define RTC_TOD_CNT_BYTE3_ADDR 0x03
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#define RTC_WD_ALM_CNT_BYTE0_ADDR 0x04
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#define RTC_WD_ALM_CNT_BYTE1_ADDR 0x05
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#define RTC_WD_ALM_CNT_BYTE2_ADDR 0x06
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#define RTC_CTL_ADDR 0x07 /* RTC-CoNTrol-register */
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#define RTC_SR_ADDR 0x08 /* RTC-StatusRegister */
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#define RTC_TCS_DS_ADDR 0x09 /* RTC-TrickleChargeSelect DiodeSelect-register */
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#define RTC_CTL_BIT_AIE (1<<0) /* Bit 0 - Alarm Interrupt enable */
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#define RTC_CTL_BIT_RS1 (1<<1) /* Bit 1/2 - Rate Select square wave output */
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#define RTC_CTL_BIT_RS2 (1<<2) /* Bit 2/2 - Rate Select square wave output */
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#define RTC_CTL_BIT_WDSTR (1<<3) /* Bit 3 - Watchdog Reset Steering */
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#define RTC_CTL_BIT_BBSQW (1<<4) /* Bit 4 - Battery-Backed Square-Wave */
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#define RTC_CTL_BIT_WD_ALM (1<<5) /* Bit 5 - Watchdoc/Alarm Counter Select */
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#define RTC_CTL_BIT_WACE (1<<6) /* Bit 6 - Watchdog/Alarm Counter Enable WACE*/
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#define RTC_CTL_BIT_EN_OSC (1<<7) /* Bit 7 - Enable Oscilator */
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#define RTC_SR_BIT_AF 0x01 /* Bit 0 = Alarm Flag */
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#define RTC_SR_BIT_OSF 0x80 /* Bit 7 - Osc Stop Flag */
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const char RtcTodAddr[] = {
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RTC_TOD_CNT_BYTE0_ADDR,
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RTC_TOD_CNT_BYTE1_ADDR,
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RTC_TOD_CNT_BYTE2_ADDR,
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RTC_TOD_CNT_BYTE3_ADDR
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};
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static uchar rtc_read (uchar reg);
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static void rtc_write(uchar reg, uchar val, bool set);
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static void rtc_write_raw (uchar reg, uchar val);
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/*
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* Get the current time from the RTC
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*/
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int rtc_get (struct rtc_time *tm){
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int rel = 0;
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unsigned long time1, time2;
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unsigned int limit;
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unsigned char tmp;
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unsigned int i;
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/*
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* Since the reads are being performed one byte at a time,
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* there is a chance that a carry will occur during the read.
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* To detect this, 2 reads are performed and compared.
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*/
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limit = 10;
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do {
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i = 4;
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time1 = 0;
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while (i--) {
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tmp = rtc_read(RtcTodAddr[i]);
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time1 = (time1 << 8) | (tmp & 0xff);
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}
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i = 4;
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time2 = 0;
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while (i--) {
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tmp = rtc_read(RtcTodAddr[i]);
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time2 = (time2 << 8) | (tmp & 0xff);
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}
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} while ((time1 != time2) && limit--);
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if (time1 != time2) {
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printf("can't get consistent time from rtc chip\n");
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rel = -1;
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}
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DEBUGR ("Get RTC s since 1.1.1970: %ld\n", time1);
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rtc_to_tm(time1, tm); /* To Gregorian Date */
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if (rtc_read(RTC_SR_ADDR) & RTC_SR_BIT_OSF) {
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printf ("### Warning: RTC oscillator has stopped\n");
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rel = -1;
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}
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DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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return rel;
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}
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/*
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* Set the RTC
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*/
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int rtc_set (struct rtc_time *tmp){
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unsigned long time;
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unsigned i;
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DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
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printf("WARNING: year should be between 1970 and 2069!\n");
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time = rtc_mktime(tmp);
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DEBUGR ("Set RTC s since 1.1.1970: %ld (0x%02lx)\n", time, time);
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/* write to RTC_TOD_CNT_BYTEn_ADDR */
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for (i = 0; i <= 3; i++) {
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rtc_write_raw(RtcTodAddr[i], (unsigned char)(time & 0xff));
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time = time >> 8;
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}
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/* Start clock */
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rtc_write(RTC_CTL_ADDR, RTC_CTL_BIT_EN_OSC, false);
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return 0;
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}
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/*
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* Reset the RTC. We setting the date back to 1970-01-01.
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* We also enable the oscillator output on the SQW/OUT pin and program
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* it for 32,768 Hz output. Note that according to the datasheet, turning
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* on the square wave output increases the current drain on the backup
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* battery to something between 480nA and 800nA.
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*/
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void rtc_reset (void){
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/* clear status flags */
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rtc_write(RTC_SR_ADDR, (RTC_SR_BIT_AF|RTC_SR_BIT_OSF), false); /* clearing OSF and AF */
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/* Initialise DS1374 oriented to MPC8349E-ADS */
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rtc_write (RTC_CTL_ADDR, (RTC_CTL_BIT_EN_OSC
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|RTC_CTL_BIT_WACE
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|RTC_CTL_BIT_AIE), false);/* start osc, disable WACE, clear AIE
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- set to 0 */
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rtc_write (RTC_CTL_ADDR, (RTC_CTL_BIT_WD_ALM
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|RTC_CTL_BIT_WDSTR
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|RTC_CTL_BIT_RS1
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|RTC_CTL_BIT_RS2
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|RTC_CTL_BIT_BBSQW), true);/* disable WD/ALM, WDSTR set to INT-pin,
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set BBSQW and SQW to 32k
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- set to 1 */
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rtc_write(RTC_WD_ALM_CNT_BYTE2_ADDR, 0xAC, true);
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rtc_write(RTC_WD_ALM_CNT_BYTE1_ADDR, 0xDE, true);
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rtc_write(RTC_WD_ALM_CNT_BYTE2_ADDR, 0xAD, true);
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}
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/*
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* Helper functions
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*/
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static uchar rtc_read (uchar reg)
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{
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return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
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}
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static void rtc_write(uchar reg, uchar val, bool set)
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{
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if (set == true) {
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val |= i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg);
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i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
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} else {
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val = i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg) & ~val;
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i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
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}
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}
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static void rtc_write_raw (uchar reg, uchar val)
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{
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i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
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}
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#endif
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