537bea5fac
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24201 a1c6a512-1295-4272-9138-f99709370657
105 lines
2.6 KiB
C
105 lines
2.6 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 Maurus Cuelenaere
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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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/*
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* Jz OnChip Real Time Clock interface for Linux
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*
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*/
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#include "config.h"
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#include "jz4740.h"
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#include "rtc.h"
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#include "timefuncs.h"
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#include "logf.h"
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/* Stolen from dietlibc-0.29/libugly/gmtime_r.c (GPLv2) */
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#define SPD (24*60*60)
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#define ISLEAP(year) (!(year%4) && ((year%100) || !(year%400)))
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static void _localtime(const time_t t, struct tm *r)
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{
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time_t i;
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register time_t work = t % SPD;
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static int m_to_d[12] = /* This could be shared with mktime() */
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{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
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r->tm_sec = work % 60;
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work /= 60;
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r->tm_min = work % 60;
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r->tm_hour = work / 60;
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work = t / SPD;
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r->tm_wday = (4 + work) % 7;
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for (i=1970; ; ++i)
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{
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register time_t k = ISLEAP(i) ? 366 : 365;
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if (work >= k)
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work -= k;
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else
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break;
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}
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r->tm_year = i - 1900;
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r->tm_yday = work;
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r->tm_mday = 1;
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if (ISLEAP(i) && (work>58))
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{
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if (work==59)
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r->tm_mday=2; /* 29.2. */
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work-=1;
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}
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for (i=11; i && (m_to_d[i] > work); --i);
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r->tm_mon = i;
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r->tm_mday += work - m_to_d[i];
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}
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int rtc_read_datetime(struct tm *tm)
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{
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_localtime(REG_RTC_RSR, tm);
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return 1;
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}
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int rtc_write_datetime(const struct tm *tm)
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{
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time_t val = mktime((struct tm*)tm);
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__cpm_start_rtc();
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udelay(100);
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REG_RTC_RSR = val;
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__cpm_stop_rtc();
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return 0;
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}
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void rtc_init(void)
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{
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__cpm_start_rtc();
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REG_RTC_RCR = RTC_RCR_RTCE;
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udelay(70);
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while( !(REG_RTC_RCR & RTC_RCR_WRDY) );
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REG_RTC_RGR = (0x7fff | RTC_RGR_LOCK);
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udelay(70);
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__cpm_stop_rtc();
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}
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