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rtc: add support for Micro Crystal RV-3029-C2 RTC

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Signed-off-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Heiko Schocher 2011-01-12 08:20:05 +01:00 committed by Wolfgang Denk
parent 466f0137e8
commit 5c4fa2eea0
2 changed files with 125 additions and 0 deletions
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1
drivers/rtc/Makefile
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@ -60,6 +60,7 @@ COBJS-$(CONFIG_RTC_PL031) += pl031.o
COBJS-$(CONFIG_RTC_PT7C4338) += pt7c4338.o
COBJS-$(CONFIG_RTC_RS5C372A) += rs5c372.o
COBJS-$(CONFIG_RTC_RTC4543) += rtc4543.o
COBJS-$(CONFIG_RTC_RV3029) += rv3029.o
COBJS-$(CONFIG_RTC_RX8025) += rx8025.o
COBJS-$(CONFIG_RTC_S3C24X0) += s3c24x0_rtc.o
COBJS-$(CONFIG_RTC_S3C44B0) += s3c44b0_rtc.o

124
drivers/rtc/rv3029.c Normal file
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@ -0,0 +1,124 @@
/*
* (C) Copyright 2010
* Heiko Schocher, DENX Software Engineering, hs@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 <command.h>
#include <i2c.h>
#include <rtc.h>
#define RTC_RV3029_CTRL_RESET 0x04
#define RTC_RV3029_CTRL_SYS_R (1 << 4)
#define RTC_RV3029_CLOCK_PAGE 0x08
#define RTC_RV3029_PAGE_LEN 7
#define RV3029C2_W_SECONDS 0x00
#define RV3029C2_W_MINUTES 0x01
#define RV3029C2_W_HOURS 0x02
#define RV3029C2_W_DATE 0x03
#define RV3029C2_W_DAYS 0x04
#define RV3029C2_W_MONTHS 0x05
#define RV3029C2_W_YEARS 0x06
#define RV3029C2_REG_HR_12_24 (1 << 6) /* 24h/12h mode */
#define RV3029C2_REG_HR_PM (1 << 5) /* PM/AM bit in 12h mode */
int rtc_get( struct rtc_time *tmp )
{
int ret;
unsigned char buf[RTC_RV3029_PAGE_LEN];
ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1, buf, \
RTC_RV3029_PAGE_LEN);
if (ret) {
printf("%s: error reading RTC: %x\n", __func__, ret);
return -1;
}
tmp->tm_sec = bcd2bin( buf[RV3029C2_W_SECONDS] & 0x7f);
tmp->tm_min = bcd2bin( buf[RV3029C2_W_MINUTES] & 0x7f);
if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_12_24) {
/* 12h format */
tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x1f);
if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_PM)
/* PM flag set */
tmp->tm_hour += 12;
} else
tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x3f);
tmp->tm_mday = bcd2bin( buf[RV3029C2_W_DATE] & 0x3F );
tmp->tm_mon = bcd2bin( buf[RV3029C2_W_MONTHS] & 0x1F );
tmp->tm_wday = bcd2bin( buf[RV3029C2_W_DAYS] & 0x07 );
/* RTC supports only years > 1999 */
tmp->tm_year = bcd2bin( buf[RV3029C2_W_YEARS]) + 2000;
tmp->tm_yday = 0;
tmp->tm_isdst = 0;
#ifdef RTC_DEBUG
printf( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec );
#endif
return 0;
}
int rtc_set( struct rtc_time *tmp )
{
int ret;
unsigned char buf[RTC_RV3029_PAGE_LEN];
#ifdef RTC_DEBUG
printf( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
if (tmp->tm_year < 2000) {
printf("RTC: year %d < 2000 not possible\n", tmp->tm_year);
return -1;
}
buf[RV3029C2_W_SECONDS] = bin2bcd(tmp->tm_sec);
buf[RV3029C2_W_MINUTES] = bin2bcd(tmp->tm_min);
buf[RV3029C2_W_HOURS] = bin2bcd(tmp->tm_hour);
/* set 24h format */
buf[RV3029C2_W_HOURS] &= ~RV3029C2_REG_HR_12_24;
buf[RV3029C2_W_DATE] = bin2bcd(tmp->tm_mday);
buf[RV3029C2_W_DAYS] = bin2bcd(tmp->tm_wday);
buf[RV3029C2_W_MONTHS] = bin2bcd(tmp->tm_mon);
tmp->tm_year -= 2000;
buf[RV3029C2_W_YEARS] = bin2bcd(tmp->tm_year);
ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1,
buf, RTC_RV3029_PAGE_LEN);
/* give the RTC some time to update */
udelay(1000);
return 0;
}
void rtc_reset (void)
{
int ret;
unsigned char buf[RTC_RV3029_PAGE_LEN];
buf[0] = RTC_RV3029_CTRL_SYS_R;
ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL_RESET, 1,
buf, 1);
}