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9f9276c34c
Rename this function so that it is clear that it is provided by the RTC. Also return an error when it cannot function as expected. This is unlikely to occur since it works for dates since 1752 and many RTCs do not support such old dates. Still it is better to be accurate. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/*
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* Copyright (c) 2004-2008 Analog Devices Inc.
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*
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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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* Licensed under the GPL-2 or later.
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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_CMD_DATE)
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#include <asm/blackfin.h>
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#include <asm/mach-common/bits/rtc.h>
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#define pr_stamp() debug("%s:%s:%i: here i am\n", __FILE__, __func__, __LINE__)
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#define MIN_TO_SECS(x) (60 * (x))
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#define HRS_TO_SECS(x) (60 * MIN_TO_SECS(x))
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#define DAYS_TO_SECS(x) (24 * HRS_TO_SECS(x))
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#define NUM_SECS_IN_MIN MIN_TO_SECS(1)
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#define NUM_SECS_IN_HR HRS_TO_SECS(1)
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#define NUM_SECS_IN_DAY DAYS_TO_SECS(1)
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/* Enable the RTC prescaler enable register */
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void rtc_init(void)
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{
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if (!(bfin_read_RTC_PREN() & 0x1))
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bfin_write_RTC_PREN(0x1);
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}
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/* Our on-chip RTC has no notion of "reset" */
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void rtc_reset(void)
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{
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rtc_init();
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}
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/* Wait for pending writes to complete */
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static void wait_for_complete(void)
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{
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pr_stamp();
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while (!(bfin_read_RTC_ISTAT() & WRITE_COMPLETE))
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if (!(bfin_read_RTC_ISTAT() & WRITE_PENDING))
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break;
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bfin_write_RTC_ISTAT(WRITE_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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int rtc_set(struct rtc_time *tmp)
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{
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unsigned long remain, days, hrs, mins, secs;
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pr_stamp();
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if (tmp == NULL) {
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puts("Error setting the date/time\n");
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return -1;
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}
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rtc_init();
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wait_for_complete();
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/* Calculate number of seconds this incoming time represents */
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remain = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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/* Figure out how many days since epoch */
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days = remain / NUM_SECS_IN_DAY;
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/* From the remaining secs, compute the hrs(0-23), mins(0-59) and secs(0-59) */
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remain = remain % NUM_SECS_IN_DAY;
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hrs = remain / NUM_SECS_IN_HR;
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remain = remain % NUM_SECS_IN_HR;
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mins = remain / NUM_SECS_IN_MIN;
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secs = remain % NUM_SECS_IN_MIN;
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/* Encode these time values into our RTC_STAT register */
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bfin_write_RTC_STAT(SET_ALARM(days, hrs, mins, secs));
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return 0;
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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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int rtc_get(struct rtc_time *tmp)
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{
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uint32_t cur_rtc_stat;
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int time_in_sec;
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int tm_sec, tm_min, tm_hr, tm_day;
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pr_stamp();
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if (tmp == NULL) {
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puts("Error getting the date/time\n");
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return -1;
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}
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rtc_init();
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wait_for_complete();
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/* Read the RTC_STAT register */
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cur_rtc_stat = bfin_read_RTC_STAT();
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/* Convert our encoded format into actual time values */
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tm_sec = (cur_rtc_stat & RTC_SEC) >> RTC_SEC_P;
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tm_min = (cur_rtc_stat & RTC_MIN) >> RTC_MIN_P;
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tm_hr = (cur_rtc_stat & RTC_HR ) >> RTC_HR_P;
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tm_day = (cur_rtc_stat & RTC_DAY) >> RTC_DAY_P;
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/* Calculate the total number of seconds since epoch */
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time_in_sec = (tm_sec) + MIN_TO_SECS(tm_min) + HRS_TO_SECS(tm_hr) + DAYS_TO_SECS(tm_day);
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rtc_to_tm(time_in_sec, tmp);
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return 0;
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}
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#endif
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