122 lines
2.8 KiB
C
122 lines
2.8 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 = rtc_mktime(tmp);
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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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