2 * Copyright (C) 2008, Guennadi Liakhovetski <lg@denx.de>
4 * See file CREDITS for list of people who contributed to this
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 static struct spi_slave *slave;
29 int rtc_get(struct rtc_time *rtc)
36 /* FIXME: Verify the max SCK rate */
37 slave = spi_setup_slave(CONFIG_MC13783_SPI_BUS,
38 CONFIG_MC13783_SPI_CS, 1000000,
39 SPI_MODE_2 | SPI_CS_HIGH);
44 if (spi_claim_bus(slave))
49 err = spi_xfer(slave, 32, (uchar *)®, (uchar *)&day1,
50 SPI_XFER_BEGIN | SPI_XFER_END);
56 err = spi_xfer(slave, 32, (uchar *)®, (uchar *)&time,
57 SPI_XFER_BEGIN | SPI_XFER_END);
63 err = spi_xfer(slave, 32, (uchar *)®, (uchar *)&day2,
64 SPI_XFER_BEGIN | SPI_XFER_END);
68 } while (day1 != day2 && i++ < 3);
70 spi_release_bus(slave);
72 tim = day1 * 86400 + time;
81 int rtc_set(struct rtc_time *rtc)
86 /* FIXME: Verify the max SCK rate */
87 slave = spi_setup_slave(CONFIG_MC13783_SPI_BUS,
88 CONFIG_MC13783_SPI_CS, 1000000,
89 SPI_MODE_2 | SPI_CS_HIGH);
94 time = mktime(rtc->tm_year, rtc->tm_mon, rtc->tm_mday,
95 rtc->tm_hour, rtc->tm_min, rtc->tm_sec);
99 if (spi_claim_bus(slave))
102 reg = 0x2c000000 | day | 0x80000000;
103 spi_xfer(slave, 32, (uchar *)®, (uchar *)&day,
104 SPI_XFER_BEGIN | SPI_XFER_END);
106 reg = 0x28000000 | time | 0x80000000;
107 spi_xfer(slave, 32, (uchar *)®, (uchar *)&time,
108 SPI_XFER_BEGIN | SPI_XFER_END);
110 spi_release_bus(slave);