f4c4221306
Instead of checking ticks, set a sticky dirty flag that indicates that the RTC needs to be read. This gives a timely update and more accurate readout without actually reading the RTC until it changes. The implementation should atomically read the flag and clear it. Setting the flag would typically happen in an RTC tick ISR. Change-Id: I6fd325f22845029a485c502c884812d3676026ea
282 lines
7.5 KiB
C
282 lines
7.5 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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/* 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 unsigned long rtc_is_dirty = 1; /* force a read right away */
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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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void MC13783_EVENT_CB_1HZ(void)
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{
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rtc_is_dirty = 1;
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}
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bool rtc_mc13783_dirty(void)
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{
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return bitclr32(&rtc_is_dirty, 1);
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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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mc13783_enable_event(MC13783_INT_ID_1HZ, true);
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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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