118 lines
2.6 KiB
C
118 lines
2.6 KiB
C
/*
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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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static struct spi_slave *slave;
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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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if (!slave) {
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/* FIXME: Verify the max SCK rate */
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slave = spi_setup_slave(CONFIG_MC13783_SPI_BUS,
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CONFIG_MC13783_SPI_CS, 1000000,
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SPI_MODE_2 | SPI_CS_HIGH);
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if (!slave)
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return -1;
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}
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if (spi_claim_bus(slave))
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return -1;
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do {
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reg = 0x2c000000;
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err = spi_xfer(slave, 32, (uchar *)®, (uchar *)&day1,
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SPI_XFER_BEGIN | SPI_XFER_END);
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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(slave, 32, (uchar *)®, (uchar *)&time,
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SPI_XFER_BEGIN | SPI_XFER_END);
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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(slave, 32, (uchar *)®, (uchar *)&day2,
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SPI_XFER_BEGIN | SPI_XFER_END);
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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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spi_release_bus(slave);
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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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int rtc_set(struct rtc_time *rtc)
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{
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u32 time, day, reg;
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if (!slave) {
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/* FIXME: Verify the max SCK rate */
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slave = spi_setup_slave(CONFIG_MC13783_SPI_BUS,
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CONFIG_MC13783_SPI_CS, 1000000,
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SPI_MODE_2 | SPI_CS_HIGH);
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if (!slave)
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return -1;
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}
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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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if (spi_claim_bus(slave))
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return -1;
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reg = 0x2c000000 | day | 0x80000000;
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spi_xfer(slave, 32, (uchar *)®, (uchar *)&day,
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SPI_XFER_BEGIN | SPI_XFER_END);
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reg = 0x28000000 | time | 0x80000000;
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spi_xfer(slave, 32, (uchar *)®, (uchar *)&time,
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SPI_XFER_BEGIN | SPI_XFER_END);
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spi_release_bus(slave);
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return -1;
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}
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void rtc_reset(void)
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{
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}
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