MC13783 is a multifunction IS with an SPI interface to the host. This driver handles the RTC controller in this chip. Signed-off-by: Guennadi Liakhovetski <lg@denx.de>master
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/*
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* Copyright (C) 2008, Guennadi Liakhovetski <lg@denx.de> |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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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 as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#include <common.h> |
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#include <rtc.h> |
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#include <spi.h> |
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int rtc_get(struct rtc_time *rtc) |
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{ |
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u32 day1, day2, time; |
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u32 reg; |
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int err, tim, i = 0; |
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spi_select(1, 0, SPI_MODE_2 | SPI_CS_HIGH); |
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do { |
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reg = 0x2c000000; |
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err = spi_xfer(0, 32, (uchar *)®, (uchar *)&day1); |
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if (err) |
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return err; |
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reg = 0x28000000; |
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err = spi_xfer(0, 32, (uchar *)®, (uchar *)&time); |
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if (err) |
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return err; |
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reg = 0x2c000000; |
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err = spi_xfer(0, 32, (uchar *)®, (uchar *)&day2); |
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if (err) |
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return err; |
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} while (day1 != day2 && i++ < 3); |
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tim = day1 * 86400 + time; |
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to_tm(tim, rtc); |
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rtc->tm_yday = 0; |
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rtc->tm_isdst = 0; |
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return 0; |
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} |
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void rtc_set(struct rtc_time *rtc) |
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{ |
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u32 time, day, reg; |
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time = mktime(rtc->tm_year, rtc->tm_mon, rtc->tm_mday, |
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rtc->tm_hour, rtc->tm_min, rtc->tm_sec); |
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day = time / 86400; |
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time %= 86400; |
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reg = 0x2c000000 | day | 0x80000000; |
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spi_xfer(0, 32, (uchar *)®, (uchar *)&day); |
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reg = 0x28000000 | time | 0x80000000; |
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spi_xfer(0, 32, (uchar *)®, (uchar *)&time); |
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} |
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void rtc_reset(void) |
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{ |
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} |
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