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https://github.com/AsahiLinux/u-boot
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209 lines
6 KiB
C
209 lines
6 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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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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static unsigned bcd2bin (uchar n)
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{
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return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
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}
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static unsigned char bin2bcd (unsigned int n)
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{
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return (((n / 10) << 4) | (n % 10));
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}
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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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int rtc_store(int addr, unsigned char* data, int size)
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{
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/*don't let things wrap onto the time on a write*/
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if( (addr+size) >= M41T11_STORAGE_SZ )
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return 1;
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return i2c_write( CONFIG_SYS_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size );
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}
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int rtc_recall(int addr, unsigned char* data, int size)
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{
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return i2c_read( CONFIG_SYS_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size );
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}
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#endif
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