c332bba905
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28891 a1c6a512-1295-4272-9138-f99709370657
269 lines
7.2 KiB
C
269 lines
7.2 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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/* None of this code concerns itself with (year mod 100) = 0 leap year
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* exceptions because all (year mod 4) = 0 years in the relevant range are
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* leap years. A base year of 1901 to an end date of 28 Feb 2100 are ok. */
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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_WDAY 1 /* Monday */
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#define RTC_BASE_YDAY 364 /* 31 Dec */
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#define RTC_BASE_YEAR 1979
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#elif 1
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#define RTC_BASE_WDAY 2 /* Tuesday */
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#define RTC_BASE_YDAY 0 /* 01 Jan */
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#define RTC_BASE_YEAR 1980
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#else
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#define RTC_BASE_WDAY 4 /* Thursday */
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#define RTC_BASE_YDAY 0 /* 01 Jan */
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#define RTC_BASE_YEAR 1970
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#endif
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/* Reference year for leap calculation - year that is on or before the base
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* year and immediately follows a leap year */
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#define RTC_REF_YEAR_OFFS ((RTC_BASE_YEAR - 1) & 3)
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#define RTC_REF_YEAR (RTC_BASE_YEAR - RTC_REF_YEAR_OFFS)
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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_RD = 3,
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RTC_NUM_REGS_WR = 2,
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};
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static const unsigned char rtc_registers[RTC_NUM_REGS_RD] =
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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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/* was it an alarm that triggered power on ? */
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static bool alarm_start = false;
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static const unsigned short month_table[13] =
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{
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/* Since 1 Jan, how many days have passed this year? (non-leap)
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+31 28 31 30 31 30 31 31 30 31 30 31 */
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365
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};
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static bool read_time_and_day(uint32_t regs[RTC_NUM_REGS_RD])
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{
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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_RD) < RTC_NUM_REGS_RD)
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{
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/* Couldn't read registers */
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return false;
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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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return true;
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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_RD];
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int year, month, yday, x, n;
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if (!read_time_and_day(regs))
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return 0;
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/* TOD: 0 to 86399 */
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x = regs[RTC_REG_TIME];
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/* Hour */
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n = x / 3600;
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tm->tm_hour = n;
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/* Minute */
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x -= n*3600;
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n = x / 60;
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tm->tm_min = n;
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/* Second */
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x -= n*60;
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tm->tm_sec = x;
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/* DAY: 0 to 32767 */
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x = regs[RTC_REG_DAY];
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/* Weekday */
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tm->tm_wday = (x + RTC_BASE_WDAY) % 7;
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/* Year */
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x += RTC_REF_YEAR_OFFS*365 + RTC_BASE_YDAY;
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/* Lag year increment by subtracting leaps since the reference year
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* on 31 Dec of each leap year, essentially removing them from the
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* calculation */
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n = (x + 1) / 1461;
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year = (x - n) / 365;
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/* Year day */
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yday = x - n - year*365;
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/* If (x + 1) mod 1461 == 0, then it is yday 365 of a leap year */
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if (n * 1461 - 1 == x)
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yday++;
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tm->tm_yday = x = yday;
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if (((year + RTC_REF_YEAR) & 3) == 0 && x >= month_table[2])
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{
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if (x > month_table[2])
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yday--; /* 1 Mar or after; lag date by one day */
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x--; /* 29 Feb or after, lag month by one day */
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}
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/* Get the current month */
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month = x >> 5; /* yday / 32, close enough */
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if (month_table[month + 1] <= x)
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month++; /* Round to next */
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tm->tm_mday = yday - month_table[month] + 1; /* 1 to 31 */
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tm->tm_mon = month; /* 0 to 11 */
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/* {BY to (BY+89 or 90)} - 1900 */
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tm->tm_year = year + RTC_REF_YEAR - 1900;
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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[RTC_NUM_REGS_WR];
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int year, month, x;
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/* Convert time of day into seconds since midnight */
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x = tm->tm_sec + tm->tm_min*60 + tm->tm_hour*3600;
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/* Keep in range (it throws off the PMIC counters otherwise) */
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regs[RTC_REG_TIME] = MAX(0, MIN(86399, x));
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year = tm->tm_year + 1900;
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/* Get the number of days elapsed from 1 Jan of reference year to 1 Jan of
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* this year */
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x = year - RTC_REF_YEAR;
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x = x*365 + (x >> 2);
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/* Add the number of days passed this year since 1 Jan and offset by the
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* base yearday and the reference offset in days from the base */
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month = tm->tm_mon;
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x += month_table[month] + tm->tm_mday - RTC_REF_YEAR_OFFS*365
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- RTC_BASE_YDAY;
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if ((year & 3) != 0 || month < 2) {
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/* Sub one day because tm_mday starts at 1, otherwise the offset is
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* required because of 29 Feb */
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x--;
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}
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/* Keep in range */
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regs[RTC_REG_DAY] = MAX(0, MIN(32767, x));
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if (mc13783_write_regs(rtc_registers, regs, RTC_NUM_REGS_WR)
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== RTC_NUM_REGS_WR)
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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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uint32_t regs[RTC_NUM_REGS_RD];
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uint32_t tod;
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if (!read_time_and_day(regs))
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return;
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tod = h*3600 + m*60;
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if (tod < regs[RTC_REG_TIME])
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regs[RTC_REG_DAY]++;
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mc13783_write(MC13783_RTC_DAY_ALARM, regs[RTC_REG_DAY]);
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mc13783_write(MC13783_RTC_ALARM, tod);
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}
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void rtc_get_alarm(int *h, int *m)
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{
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uint32_t 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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