/* * Copyright (c) 2004-2008 Analog Devices Inc. * * (C) Copyright 2001 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * Licensed under the GPL-2 or later. */ #include <common.h> #include <command.h> #include <rtc.h> #if defined(CONFIG_CMD_DATE) #include <asm/blackfin.h> #include <asm/mach-common/bits/rtc.h> #define pr_stamp() debug("%s:%s:%i: here i am\n", __FILE__, __func__, __LINE__) #define MIN_TO_SECS(x) (60 * (x)) #define HRS_TO_SECS(x) (60 * MIN_TO_SECS(x)) #define DAYS_TO_SECS(x) (24 * HRS_TO_SECS(x)) #define NUM_SECS_IN_MIN MIN_TO_SECS(1) #define NUM_SECS_IN_HR HRS_TO_SECS(1) #define NUM_SECS_IN_DAY DAYS_TO_SECS(1) /* Enable the RTC prescaler enable register */ static void rtc_init(void) { if (!(bfin_read_RTC_PREN() & 0x1)) bfin_write_RTC_PREN(0x1); } /* Our on-chip RTC has no notion of "reset" */ void rtc_reset(void) { rtc_init(); } /* Wait for pending writes to complete */ static void wait_for_complete(void) { pr_stamp(); while (!(bfin_read_RTC_ISTAT() & WRITE_COMPLETE)) if (!(bfin_read_RTC_ISTAT() & WRITE_PENDING)) break; bfin_write_RTC_ISTAT(WRITE_COMPLETE); } /* Set the time. Get the time_in_secs which is the number of seconds since Jan 1970 and set the RTC registers * based on this value. */ int rtc_set(struct rtc_time *tmp) { unsigned long remain, days, hrs, mins, secs; pr_stamp(); if (tmp == NULL) { puts("Error setting the date/time\n"); return -1; } rtc_init(); wait_for_complete(); /* Calculate number of seconds this incoming time represents */ remain = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); /* Figure out how many days since epoch */ days = remain / NUM_SECS_IN_DAY; /* From the remaining secs, compute the hrs(0-23), mins(0-59) and secs(0-59) */ remain = remain % NUM_SECS_IN_DAY; hrs = remain / NUM_SECS_IN_HR; remain = remain % NUM_SECS_IN_HR; mins = remain / NUM_SECS_IN_MIN; secs = remain % NUM_SECS_IN_MIN; /* Encode these time values into our RTC_STAT register */ bfin_write_RTC_STAT(SET_ALARM(days, hrs, mins, secs)); return 0; } /* Read the time from the RTC_STAT. time_in_seconds is seconds since Jan 1970 */ int rtc_get(struct rtc_time *tmp) { uint32_t cur_rtc_stat; int time_in_sec; int tm_sec, tm_min, tm_hr, tm_day; pr_stamp(); if (tmp == NULL) { puts("Error getting the date/time\n"); return -1; } rtc_init(); wait_for_complete(); /* Read the RTC_STAT register */ cur_rtc_stat = bfin_read_RTC_STAT(); /* Convert our encoded format into actual time values */ tm_sec = (cur_rtc_stat & RTC_SEC) >> RTC_SEC_P; tm_min = (cur_rtc_stat & RTC_MIN) >> RTC_MIN_P; tm_hr = (cur_rtc_stat & RTC_HR ) >> RTC_HR_P; tm_day = (cur_rtc_stat & RTC_DAY) >> RTC_DAY_P; /* Calculate the total number of seconds since epoch */ time_in_sec = (tm_sec) + MIN_TO_SECS(tm_min) + HRS_TO_SECS(tm_hr) + DAYS_TO_SECS(tm_day); to_tm(time_in_sec, tmp); return 0; } #endif