Conflicts: drivers/rtc/Makefile Signed-off-by: Wolfgang Denk <wd@denx.de>master
Wolfgang Denk
17 years ago
commit
e95bcc3661
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/*
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* (C) Copyright 2008 |
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* Tor Krill, Excito Elektronik i Skåne , tor@excito.com |
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* |
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* Modelled after the ds1337 driver |
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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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* Date & Time support (no alarms) for Intersil |
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* ISL1208 Real Time Clock (RTC). |
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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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/*---------------------------------------------------------------------*/ |
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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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/*
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* RTC register addresses |
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*/ |
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#define RTC_SEC_REG_ADDR 0x0 |
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#define RTC_MIN_REG_ADDR 0x1 |
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#define RTC_HR_REG_ADDR 0x2 |
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#define RTC_DATE_REG_ADDR 0x3 |
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#define RTC_MON_REG_ADDR 0x4 |
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#define RTC_YR_REG_ADDR 0x5 |
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#define RTC_DAY_REG_ADDR 0x6 |
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#define RTC_STAT_REG_ADDR 0x7 |
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/*
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* RTC control register bits |
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*/ |
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/*
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* RTC status register bits |
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*/ |
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#define RTC_STAT_BIT_ARST 0x80 /* AUTO RESET ENABLE BIT */ |
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#define RTC_STAT_BIT_XTOSCB 0x40 /* CRYSTAL OSCILLATOR ENABLE BIT */ |
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#define RTC_STAT_BIT_WRTC 0x10 /* WRITE RTC ENABLE BIT */ |
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#define RTC_STAT_BIT_ALM 0x04 /* ALARM BIT */ |
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#define RTC_STAT_BIT_BAT 0x02 /* BATTERY BIT */ |
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#define RTC_STAT_BIT_RTCF 0x01 /* REAL TIME CLOCK FAIL BIT */ |
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static uchar rtc_read (uchar reg); |
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static void rtc_write (uchar reg, uchar val); |
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static uchar bin2bcd (unsigned int n); |
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static unsigned bcd2bin (uchar c); |
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/*
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* Get the current time from the RTC |
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*/ |
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void rtc_get (struct rtc_time *tmp) |
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{ |
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uchar sec, min, hour, mday, wday, mon, year, status; |
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status = rtc_read (RTC_STAT_REG_ADDR); |
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sec = rtc_read (RTC_SEC_REG_ADDR); |
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min = rtc_read (RTC_MIN_REG_ADDR); |
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hour = rtc_read (RTC_HR_REG_ADDR); |
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wday = rtc_read (RTC_DAY_REG_ADDR); |
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mday = rtc_read (RTC_DATE_REG_ADDR); |
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mon = rtc_read (RTC_MON_REG_ADDR); |
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year = rtc_read (RTC_YR_REG_ADDR); |
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DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x " |
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"hr: %02x min: %02x sec: %02x status: %02x\n", |
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year, mon, mday, wday, hour, min, sec, status); |
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if (status & RTC_STAT_BIT_RTCF) { |
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printf ("### Warning: RTC oscillator has stopped\n"); |
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rtc_write(RTC_STAT_REG_ADDR, |
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rtc_read(RTC_STAT_REG_ADDR) &~ (RTC_STAT_BIT_BAT|RTC_STAT_BIT_RTCF)); |
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} |
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tmp->tm_sec = bcd2bin (sec & 0x7F); |
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tmp->tm_min = bcd2bin (min & 0x7F); |
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tmp->tm_hour = bcd2bin (hour & 0x3F); |
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tmp->tm_mday = bcd2bin (mday & 0x3F); |
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tmp->tm_mon = bcd2bin (mon & 0x1F); |
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tmp->tm_year = bcd2bin (year)+2000; |
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tmp->tm_wday = bcd2bin (wday & 0x07); |
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tmp->tm_yday = 0; |
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tmp->tm_isdst= 0; |
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DEBUGR ("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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} |
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/*
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* Set the RTC |
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*/ |
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void rtc_set (struct rtc_time *tmp) |
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{ |
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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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/* enable write */ |
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rtc_write(RTC_STAT_REG_ADDR, |
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rtc_read(RTC_STAT_REG_ADDR) | RTC_STAT_BIT_WRTC); |
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rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100)); |
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rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon)); |
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rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday)); |
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rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday)); |
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rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour) | 0x80 ); /* 24h clock */ |
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rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min)); |
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rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec)); |
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/* disable write */ |
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rtc_write(RTC_STAT_REG_ADDR, |
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rtc_read(RTC_STAT_REG_ADDR) & ~RTC_STAT_BIT_WRTC); |
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} |
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void rtc_reset (void) |
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{ |
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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 (CFG_I2C_RTC_ADDR, reg)); |
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} |
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static void rtc_write (uchar reg, uchar val) |
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{ |
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i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val); |
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} |
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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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