mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
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>
171 lines
4.8 KiB
C
171 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2002
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* Andrew May, Viasat Inc, amay@viasat.com
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*/
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/*
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* M41T11 Serial Access Timekeeper(R) SRAM
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* can you believe a trademark on that?
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*/
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/* #define DEBUG 1 */
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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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/*
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I Don't have an example config file but this
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is what should be done.
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#define CONFIG_RTC_M41T11 1
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#define CONFIG_SYS_I2C_RTC_ADDR 0x68
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#if 0
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#define CONFIG_SYS_M41T11_EXT_CENTURY_DATA
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#else
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#define CONFIG_SYS_M41T11_BASE_YEAR 2000
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#endif
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*/
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#if defined(CONFIG_SYS_I2C_RTC_ADDR) && defined(CONFIG_CMD_DATE)
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/* ------------------------------------------------------------------------- */
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/*
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these are simple defines for the chip local to here so they aren't too
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verbose
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DAY/DATE aren't nice but that is how they are on the data sheet
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*/
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#define RTC_SEC_ADDR 0x0
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#define RTC_MIN_ADDR 0x1
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#define RTC_HOUR_ADDR 0x2
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#define RTC_DAY_ADDR 0x3
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#define RTC_DATE_ADDR 0x4
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#define RTC_MONTH_ADDR 0x5
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#define RTC_YEARS_ADDR 0x6
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#define RTC_REG_CNT 7
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#define RTC_CONTROL_ADDR 0x7
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#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA
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#define REG_CNT (RTC_REG_CNT+1)
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/*
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you only get 00-99 for the year we will asume you
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want from the year 2000 if you don't set the config
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*/
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#ifndef CONFIG_SYS_M41T11_BASE_YEAR
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#define CONFIG_SYS_M41T11_BASE_YEAR 2000
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#endif
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#else
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/* we will store extra year info in byte 9*/
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#define M41T11_YEAR_DATA 0x8
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#define M41T11_YEAR_SIZE 1
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#define REG_CNT (RTC_REG_CNT+1+M41T11_YEAR_SIZE)
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#endif
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#define M41T11_STORAGE_SZ (64-REG_CNT)
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int rtc_get (struct rtc_time *tmp)
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{
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int rel = 0;
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uchar data[RTC_REG_CNT];
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i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT);
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if( data[RTC_SEC_ADDR] & 0x80 ){
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printf( "m41t11 RTC Clock stopped!!!\n" );
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rel = -1;
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}
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tmp->tm_sec = bcd2bin (data[RTC_SEC_ADDR] & 0x7F);
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tmp->tm_min = bcd2bin (data[RTC_MIN_ADDR] & 0x7F);
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tmp->tm_hour = bcd2bin (data[RTC_HOUR_ADDR] & 0x3F);
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tmp->tm_mday = bcd2bin (data[RTC_DATE_ADDR] & 0x3F);
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tmp->tm_mon = bcd2bin (data[RTC_MONTH_ADDR]& 0x1F);
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#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA
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tmp->tm_year = CONFIG_SYS_M41T11_BASE_YEAR
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+ bcd2bin(data[RTC_YEARS_ADDR])
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+ ((data[RTC_HOUR_ADDR]&0x40) ? 100 : 0);
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#else
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{
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unsigned char cent;
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i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE);
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if( !(data[RTC_HOUR_ADDR] & 0x80) ){
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printf( "m41t11 RTC: cann't keep track of years without CEB set\n" );
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rel = -1;
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}
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if( (cent & 0x1) != ((data[RTC_HOUR_ADDR]&0x40)>>7) ){
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/*century flip store off new year*/
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cent += 1;
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i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE);
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}
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tmp->tm_year =((int)cent*100)+bcd2bin(data[RTC_YEARS_ADDR]);
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}
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#endif
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tmp->tm_wday = bcd2bin (data[RTC_DAY_ADDR] & 0x07);
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tmp->tm_yday = 0;
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tmp->tm_isdst= 0;
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debug ( "Get 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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return rel;
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}
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int rtc_set (struct rtc_time *tmp)
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{
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uchar data[RTC_REG_CNT];
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debug ( "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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data[RTC_SEC_ADDR] = bin2bcd(tmp->tm_sec) & 0x7F;/*just in case*/
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data[RTC_MIN_ADDR] = bin2bcd(tmp->tm_min);
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data[RTC_HOUR_ADDR] = bin2bcd(tmp->tm_hour) & 0x3F;/*handle cent stuff later*/
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data[RTC_DATE_ADDR] = bin2bcd(tmp->tm_mday) & 0x3F;
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data[RTC_MONTH_ADDR] = bin2bcd(tmp->tm_mon);
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data[RTC_DAY_ADDR] = bin2bcd(tmp->tm_wday) & 0x07;
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data[RTC_HOUR_ADDR] |= 0x80;/*we will always use CEB*/
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data[RTC_YEARS_ADDR] = bin2bcd(tmp->tm_year%100);/*same thing either way*/
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#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA
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if( ((tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 200) ||
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(tmp->tm_year < CONFIG_SYS_M41T11_BASE_YEAR) ){
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printf( "m41t11 RTC setting year out of range!!need recompile\n" );
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}
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data[RTC_HOUR_ADDR] |= (tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 100 ? 0x40 : 0;
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#else
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{
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unsigned char cent;
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cent = tmp->tm_year ? tmp->tm_year / 100 : 0;
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data[RTC_HOUR_ADDR] |= (cent & 0x1) ? 0x40 : 0;
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i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE);
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}
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#endif
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i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT);
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return 0;
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}
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void rtc_reset (void)
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{
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unsigned char val;
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/* clear all control & status registers */
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i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, 1);
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val = val & 0x7F;/*make sure we are running*/
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i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, RTC_REG_CNT);
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i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1);
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val = val & 0x3F;/*turn off freq test keep calibration*/
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i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1);
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}
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#endif
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