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
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Changes since v1: update to current git HEAD
README | 1 + drivers/rtc/Makefile | 1 + drivers/rtc/mc13783-rtc.c | 82 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 84 insertions(+), 0 deletions(-) create mode 100644 drivers/rtc/mc13783-rtc.c
diff --git a/README b/README index d201b92..7c5f9a0 100644 --- a/README +++ b/README @@ -672,6 +672,7 @@ The following options need to be configured:
CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC + CONFIG_RTC_MC13783 - use MC13783 RTC CONFIG_RTC_MC146818 - use MC146818 RTC CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 800ab99..2e0c118 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -45,6 +45,7 @@ COBJS-y += m41t60.o COBJS-$(CONFIG_RTC_M41T62) += m41t62.o COBJS-y += m48t35ax.o COBJS-y += max6900.o +COBJS-$(CONFIG_RTC_MC13783) += mc13783-rtc.o COBJS-y += mc146818.o COBJS-y += mcfrtc.o COBJS-y += mk48t59.o diff --git a/drivers/rtc/mc13783-rtc.c b/drivers/rtc/mc13783-rtc.c new file mode 100644 index 0000000..35b1b8b --- /dev/null +++ b/drivers/rtc/mc13783-rtc.c @@ -0,0 +1,82 @@ +/* + * Copyright (C) 2008, Guennadi Liakhovetski lg@denx.de + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <rtc.h> +#include <spi.h> + +int rtc_get(struct rtc_time *rtc) +{ + u32 day1, day2, time; + u32 reg; + int err, tim, i = 0; + + spi_select(1, 0, SPI_MODE_2 | SPI_CS_HIGH); + + do { + reg = 0x2c000000; + err = spi_xfer(0, 32, (uchar *)®, (uchar *)&day1); + + if (err) + return err; + + reg = 0x28000000; + err = spi_xfer(0, 32, (uchar *)®, (uchar *)&time); + + if (err) + return err; + + reg = 0x2c000000; + err = spi_xfer(0, 32, (uchar *)®, (uchar *)&day2); + + if (err) + return err; + } while (day1 != day2 && i++ < 3); + + tim = day1 * 86400 + time; + to_tm(tim, rtc); + + rtc->tm_yday = 0; + rtc->tm_isdst = 0; + + return 0; +} + +void rtc_set(struct rtc_time *rtc) +{ + u32 time, day, reg; + + time = mktime(rtc->tm_year, rtc->tm_mon, rtc->tm_mday, + rtc->tm_hour, rtc->tm_min, rtc->tm_sec); + day = time / 86400; + time %= 86400; + + reg = 0x2c000000 | day | 0x80000000; + spi_xfer(0, 32, (uchar *)®, (uchar *)&day); + + reg = 0x28000000 | time | 0x80000000; + spi_xfer(0, 32, (uchar *)®, (uchar *)&time); +} + +void rtc_reset(void) +{ +}