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https://github.com/brain-hackers/u-boot-brain
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1a6337b013
The i.MX31 has three SPI buses and each bus has several chip selects and the MC13783 chip can be connected to any of these. The current RTC driver for MC13783 is hardcoded for CSPI2/SS2. This patch makes make MC13783 SPI bus and chip select configurable via CONFIG_MC13783_SPI_BUS and CONFIG_MC13783_SPI_CS. Signed-off-by: Magnus Lilja <lilja.magnus@gmail.com>
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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