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RTC driver for MC13783

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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>
This commit is contained in:
Guennadi Liakhovetski 2008-04-15 14:15:30 +02:00 • committed by Wolfgang Denk
parent 38254f45b0
commit 7ce6370982
3 changed files with 84 additions and 0 deletions
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1
README
View file

@ -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

1
drivers/rtc/Makefile
View file

@ -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

82
drivers/rtc/mc13783-rtc.c Normal file
View file

@ -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 *)&reg, (uchar *)&day1);
if (err)
return err;
reg = 0x28000000;
err = spi_xfer(0, 32, (uchar *)&reg, (uchar *)&time);
if (err)
return err;
reg = 0x2c000000;
err = spi_xfer(0, 32, (uchar *)&reg, (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 *)&reg, (uchar *)&day);
reg = 0x28000000 | time | 0x80000000;
spi_xfer(0, 32, (uchar *)&reg, (uchar *)&time);
}
void rtc_reset(void)
{
}