144 lines
4.4 KiB
C
144 lines
4.4 KiB
C
/*
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* (C) Copyright 2001
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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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* Real Time Clock interface of ADI21535 (Blackfin) for uCLinux
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*
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* Copyright (C) 2003 Motorola Corporation. All rights reserved.
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* Richard Xiao (A2590C@email.mot.com)
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*
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* Copyright (C) 1996 Paul Gortmaker
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*
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*
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* Based on other minimal char device drivers, like Alan's
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* watchdog, Ted's random, etc. etc.
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*
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* 1.07 Paul Gortmaker.
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* 1.08 Miquel van Smoorenburg: disallow certain things on the
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* DEC Alpha as the CMOS clock is also used for other things.
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* 1.09 Nikita Schmidt: epoch support and some Alpha cleanup.
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* 1.09a Pete Zaitcev: Sun SPARC
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* 1.09b Jeff Garzik: Modularize, init cleanup
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* 1.09c Jeff Garzik: SMP cleanup
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* 1.10 Paul Barton-Davis: add support for async I/O
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* 1.10a Andrea Arcangeli: Alpha updates
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* 1.10b Andrew Morton: SMP lock fix
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* 1.10c Cesar Barros: SMP locking fixes and cleanup
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* 1.10d Paul Gortmaker: delete paranoia check in rtc_exit
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* 1.10e LG Soft India: Register access is different in BF533.
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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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#if defined(CONFIG_RTC_BFIN) && (CONFIG_COMMANDS & CFG_CMD_DATE)
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#include <asm/blackfin.h>
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#include <asm/arch/bf5xx_rtc.h>
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void rtc_reset(void)
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{
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return; /* nothing to do */
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}
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/* Wait for pending writes to complete */
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void wait_for_complete(void)
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{
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while (!(*(volatile unsigned short *)RTC_ISTAT & 0x8000)) {
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printf("");
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}
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*(volatile unsigned short *)RTC_ISTAT = 0x8000;
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}
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/* Enable the RTC prescaler enable register */
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void rtc_init()
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{
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*(volatile unsigned short *)RTC_PREN = 0x1;
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wait_for_complete();
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}
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/* Set the time. Get the time_in_secs which is the number of seconds since Jan 1970 and set the RTC registers
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* based on this value.
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*/
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void rtc_set(struct rtc_time *tmp)
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{
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unsigned long n_days_1970 = 0;
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unsigned long n_secs_rem = 0;
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unsigned long n_hrs = 0;
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unsigned long n_mins = 0;
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unsigned long n_secs = 0;
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unsigned long time_in_secs;
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if (tmp == NULL) {
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printf("Error setting the date/time \n");
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return;
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}
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time_in_secs =
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mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour,
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tmp->tm_min, tmp->tm_sec);
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/* Compute no. of days since 1970 */
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n_days_1970 = (unsigned long)(time_in_secs / (NUM_SECS_IN_DAY));
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/* From the remining secs, compute the hrs(0-23), mins(0-59) and secs(0-59) */
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n_secs_rem = (unsigned long)(time_in_secs % (NUM_SECS_IN_DAY));
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n_hrs = n_secs_rem / (NUM_SECS_IN_HOUR);
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n_secs_rem = n_secs_rem % (NUM_SECS_IN_HOUR);
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n_mins = n_secs_rem / (NUM_SECS_IN_MIN);
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n_secs = n_secs_rem % (NUM_SECS_IN_MIN);
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/* Store the new time in the RTC_STAT register */
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*(volatile unsigned long *)RTC_STAT =
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((n_days_1970 << DAY_BITS_OFF) | (n_hrs << HOUR_BITS_OFF) |
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(n_mins << MIN_BITS_OFF) | (n_secs << SEC_BITS_OFF));
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wait_for_complete();
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}
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/* Read the time from the RTC_STAT. time_in_seconds is seconds since Jan 1970 */
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void rtc_get(struct rtc_time *tmp)
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{
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unsigned long cur_rtc_stat = 0;
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unsigned long time_in_sec;
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unsigned long tm_sec = 0, tm_min = 0, tm_hour = 0, tm_day = 0;
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if (tmp == NULL) {
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printf("Error getting the date/time \n");
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return;
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}
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/* Read the RTC_STAT register */
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cur_rtc_stat = *(volatile unsigned long *)RTC_STAT;
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/* Get the secs (0-59), mins (0-59), hrs (0-23) and the days since Jan 1970 */
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tm_sec = (cur_rtc_stat >> SEC_BITS_OFF) & 0x3f;
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tm_min = (cur_rtc_stat >> MIN_BITS_OFF) & 0x3f;
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tm_hour = (cur_rtc_stat >> HOUR_BITS_OFF) & 0x1f;
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tm_day = (cur_rtc_stat >> DAY_BITS_OFF) & 0x7fff;
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/* Calculate the total number of seconds since Jan 1970 */
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time_in_sec = (tm_sec) +
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MIN_TO_SECS(tm_min) + HRS_TO_SECS(tm_hour) + DAYS_TO_SECS(tm_day);
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to_tm(time_in_sec, tmp);
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}
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#endif /* CONFIG_RTC_BFIN && CFG_CMD_DATE */
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