ba46c88c6f
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26245 a1c6a512-1295-4272-9138-f99709370657
257 lines
6.5 KiB
C
257 lines
6.5 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 by Michael Sevakis
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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
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "system.h"
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#include "rtc.h"
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#include "mc13783.h"
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/* NOTE: Defined the base to be original firmware compatible if needed -
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* ie. the day and year as it would interpret a DAY register value of zero. */
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/* Days passed since midnight 01 Jan, 1601 to midnight on the base date. */
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#ifdef TOSHIBA_GIGABEAT_S
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/* Gigabeat S seems to be 1 day behind the ususual - this will
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* make the RTC match file dates created by retailos. */
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#define RTC_BASE_DAY_COUNT 138425
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#define RTC_BASE_MONTH 12
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#define RTC_BASE_DAY 31
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#define RTC_BASE_YEAR 1979
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#elif 1
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#define RTC_BASE_DAY_COUNT 138426
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#define RTC_BASE_MONTH 1
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#define RTC_BASE_DAY 1
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#define RTC_BASE_YEAR 1980
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#else
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#define RTC_BASE_DAY_COUNT 134774
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#define RTC_BASE_MONTH 1
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#define RTC_BASE_DAY 1
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#define RTC_BASE_YEAR 1970
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#endif
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enum rtc_registers_indexes
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{
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RTC_REG_TIME = 0,
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RTC_REG_DAY,
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RTC_REG_TIME2,
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RTC_NUM_REGS,
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};
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/* was it an alarm that triggered power on ? */
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static bool alarm_start = false;
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static const unsigned char rtc_registers[RTC_NUM_REGS] =
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{
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[RTC_REG_TIME] = MC13783_RTC_TIME,
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[RTC_REG_DAY] = MC13783_RTC_DAY,
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[RTC_REG_TIME2] = MC13783_RTC_TIME,
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};
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static const unsigned char month_table[2][12] =
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{
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{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
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{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
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};
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/* Get number of leaps since the reference date of 1601/01/01 */
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static int get_leap_count(int d)
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{
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int lm = (d + 1) / 146097;
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int lc = (d + 1 - lm) / 36524;
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int ly = (d + 1 - lm + lc) / 1461;
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return ly - lc + lm;
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}
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static int is_leap_year(int y)
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{
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return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0) ? 1 : 0;
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}
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/** Public APIs **/
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void rtc_init(void)
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{
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/* only needs to be polled on startup */
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if (mc13783_read(MC13783_INTERRUPT_STATUS1) & MC13783_TODAI)
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{
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alarm_start = true;
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mc13783_write(MC13783_INTERRUPT_STATUS1, MC13783_TODAI);
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}
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}
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int rtc_read_datetime(struct tm *tm)
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{
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uint32_t regs[RTC_NUM_REGS];
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int year, leap, month, day, hour, min;
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/* Read time, day, time - 2nd read of time should be the same or
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* greater */
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do
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{
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if (mc13783_read_regs(rtc_registers, regs,
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RTC_NUM_REGS) < RTC_NUM_REGS)
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{
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/* Couldn't read registers */
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return 0;
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}
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}
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/* If TOD counter turned over - reread */
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while (regs[RTC_REG_TIME2] < regs[RTC_REG_TIME]);
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/* TOD: = 0 to 86399 */
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hour = regs[RTC_REG_TIME] / 3600;
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regs[RTC_REG_TIME] -= hour*3600;
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tm->tm_hour = hour;
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min = regs[RTC_REG_TIME] / 60;
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regs[RTC_REG_TIME] -= min*60;
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tm->tm_min = min;
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tm->tm_sec = regs[RTC_REG_TIME];
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/* DAY: 0 to 32767 */
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day = regs[RTC_REG_DAY] + RTC_BASE_DAY_COUNT;
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/* Weekday */
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tm->tm_wday = (day + 1) % 7; /* 1601/01/01 = Monday */
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/* Get number of leaps for today */
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leap = get_leap_count(day);
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year = (day - leap) / 365;
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/* Get number of leaps for yesterday */
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leap = get_leap_count(day - 1);
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/* Get day number for year 0-364|365 */
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day = day - leap - year * 365;
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year += 1601;
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/* Get the current month */
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leap = is_leap_year(year);
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for (month = 0; month < 12; month++)
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{
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int days = month_table[leap][month];
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if (day < days)
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break;
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day -= days;
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}
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tm->tm_mday = day + 1; /* 1 to 31 */
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tm->tm_mon = month; /* 0 to 11 */
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tm->tm_year = year % 100 + 100;
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return 7;
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}
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int rtc_write_datetime(const struct tm *tm)
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{
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uint32_t regs[2];
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int year, leap, month, day, i, base_yearday;
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regs[RTC_REG_TIME] = tm->tm_sec +
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tm->tm_min*60 +
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tm->tm_hour*3600;
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year = tm->tm_year - 100;
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if (year < RTC_BASE_YEAR - 1900)
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year += 2000;
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else
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year += 1900;
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/* Get number of leaps for day before base */
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leap = get_leap_count(RTC_BASE_DAY_COUNT - 1);
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/* Get day number for base year 0-364|365 */
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base_yearday = RTC_BASE_DAY_COUNT - leap -
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(RTC_BASE_YEAR - 1601) * 365;
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/* Get the number of days elapsed from reference */
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for (i = RTC_BASE_YEAR, day = 0; i < year; i++)
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{
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day += is_leap_year(i) ? 366 : 365;
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}
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/* Find the number of days passed this year up to the 1st of the
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* month. */
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leap = is_leap_year(year);
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month = tm->tm_mon;
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for (i = 0; i < month; i++)
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{
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day += month_table[leap][i];
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}
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regs[RTC_REG_DAY] = day + tm->tm_mday - 1 - base_yearday;
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if (mc13783_write_regs(rtc_registers, regs, 2) == 2)
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{
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return 7;
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}
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return 0;
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}
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bool rtc_check_alarm_flag(void)
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{
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/* We don't need to do anything special if it has already fired */
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return false;
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}
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void rtc_enable_alarm(bool enable)
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{
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if (enable)
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mc13783_clear(MC13783_INTERRUPT_MASK1, MC13783_TODAM);
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else
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mc13783_set(MC13783_INTERRUPT_MASK1, MC13783_TODAM);
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}
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bool rtc_check_alarm_started(bool release_alarm)
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{
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bool rc = alarm_start;
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if (release_alarm)
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alarm_start = false;
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return rc;
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}
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void rtc_set_alarm(int h, int m)
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{
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int day = mc13783_read(MC13783_RTC_DAY);
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int tod = mc13783_read(MC13783_RTC_TIME);
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if (h*3600 + m*60 < tod)
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day++;
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mc13783_write(MC13783_RTC_DAY_ALARM, day);
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mc13783_write(MC13783_RTC_ALARM, h*3600 + m*60);
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}
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void rtc_get_alarm(int *h, int *m)
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{
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int tod = mc13783_read(MC13783_RTC_ALARM);
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*h = tod / 3600;
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*m = tod % 3600 / 60;
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}
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