+++ /dev/null
-/*
- * (C) Copyright 2001, 2002
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- * Keith Outwater, keith_outwater@mvis.com`
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
-
-/*
- * Date & Time support (no alarms) for Dallas Semiconductor (now Maxim)
- * DS1337 Real Time Clock (RTC).
- */
-
-#include <common.h>
-#include <command.h>
-#include <rtc.h>
-#include <i2c.h>
-
-#if defined(CONFIG_RTC_DS1337) && defined(CONFIG_CMD_DATE)
-
-/*---------------------------------------------------------------------*/
-#undef DEBUG_RTC
-
-#ifdef DEBUG_RTC
-#define DEBUGR(fmt,args...) printf(fmt ,##args)
-#else
-#define DEBUGR(fmt,args...)
-#endif
-/*---------------------------------------------------------------------*/
-
-/*
- * RTC register addresses
- */
-#define RTC_SEC_REG_ADDR 0x0
-#define RTC_MIN_REG_ADDR 0x1
-#define RTC_HR_REG_ADDR 0x2
-#define RTC_DAY_REG_ADDR 0x3
-#define RTC_DATE_REG_ADDR 0x4
-#define RTC_MON_REG_ADDR 0x5
-#define RTC_YR_REG_ADDR 0x6
-#define RTC_CTL_REG_ADDR 0x0e
-#define RTC_STAT_REG_ADDR 0x0f
-
-/*
- * RTC control register bits
- */
-#define RTC_CTL_BIT_A1IE 0x1 /* Alarm 1 interrupt enable */
-#define RTC_CTL_BIT_A2IE 0x2 /* Alarm 2 interrupt enable */
-#define RTC_CTL_BIT_INTCN 0x4 /* Interrupt control */
-#define RTC_CTL_BIT_RS1 0x8 /* Rate select 1 */
-#define RTC_CTL_BIT_RS2 0x10 /* Rate select 2 */
-#define RTC_CTL_BIT_DOSC 0x80 /* Disable Oscillator */
-
-/*
- * RTC status register bits
- */
-#define RTC_STAT_BIT_A1F 0x1 /* Alarm 1 flag */
-#define RTC_STAT_BIT_A2F 0x2 /* Alarm 2 flag */
-#define RTC_STAT_BIT_OSF 0x80 /* Oscillator stop flag */
-
-
-static uchar rtc_read (uchar reg);
-static void rtc_write (uchar reg, uchar val);
-static uchar bin2bcd (unsigned int n);
-static unsigned bcd2bin (uchar c);
-
-
-/*
- * Get the current time from the RTC
- */
-void rtc_get (struct rtc_time *tmp)
-{
- uchar sec, min, hour, mday, wday, mon_cent, year, control, status;
-
- control = rtc_read (RTC_CTL_REG_ADDR);
- status = rtc_read (RTC_STAT_REG_ADDR);
- sec = rtc_read (RTC_SEC_REG_ADDR);
- min = rtc_read (RTC_MIN_REG_ADDR);
- hour = rtc_read (RTC_HR_REG_ADDR);
- wday = rtc_read (RTC_DAY_REG_ADDR);
- mday = rtc_read (RTC_DATE_REG_ADDR);
- mon_cent = rtc_read (RTC_MON_REG_ADDR);
- year = rtc_read (RTC_YR_REG_ADDR);
-
- DEBUGR ("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
- "hr: %02x min: %02x sec: %02x control: %02x status: %02x\n",
- year, mon_cent, mday, wday, hour, min, sec, control, status);
-
- if (status & RTC_STAT_BIT_OSF) {
- printf ("### Warning: RTC oscillator has stopped\n");
- /* clear the OSF flag */
- rtc_write (RTC_STAT_REG_ADDR,
- rtc_read (RTC_STAT_REG_ADDR) & ~RTC_STAT_BIT_OSF);
- }
-
- tmp->tm_sec = bcd2bin (sec & 0x7F);
- tmp->tm_min = bcd2bin (min & 0x7F);
- tmp->tm_hour = bcd2bin (hour & 0x3F);
- tmp->tm_mday = bcd2bin (mday & 0x3F);
- tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
- tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 2000 : 1900);
- tmp->tm_wday = bcd2bin ((wday - 1) & 0x07);
- tmp->tm_yday = 0;
- tmp->tm_isdst= 0;
-
- DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
- tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
- tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
-}
-
-
-/*
- * Set the RTC
- */
-void rtc_set (struct rtc_time *tmp)
-{
- uchar century;
-
- DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
- tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
- tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
-
- rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
-
- century = (tmp->tm_year >= 2000) ? 0x80 : 0;
- rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon) | century);
-
- rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday + 1));
- rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
- rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
- rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
- rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
-}
-
-
-/*
- * Reset the RTC. We also enable the oscillator output on the
- * SQW/INTB* pin and program it for 32,768 Hz output. Note that
- * according to the datasheet, turning on the square wave output
- * increases the current drain on the backup battery from about
- * 600 nA to 2uA.
- */
-void rtc_reset (void)
-{
- rtc_write (RTC_CTL_REG_ADDR, RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2);
-}
-
-
-/*
- * Helper functions
- */
-
-static
-uchar rtc_read (uchar reg)
-{
- return (i2c_reg_read (CFG_I2C_RTC_ADDR, reg));
-}
-
-
-static void rtc_write (uchar reg, uchar val)
-{
- i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val);
-}
-
-static unsigned bcd2bin (uchar n)
-{
- return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
-}
-
-static unsigned char bin2bcd (unsigned int n)
-{
- return (((n / 10) << 4) | (n % 10));
-}
-
-#endif
projects / karo-tx-uboot.git / blobdiff