diff options
Diffstat (limited to 'drivers/rtc/rv3029.c')
| -rw-r--r-- | drivers/rtc/rv3029.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/rtc/rv3029.c b/drivers/rtc/rv3029.c new file mode 100644 index 0000000..3ebc768 --- /dev/null +++ b/drivers/rtc/rv3029.c @@ -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); +} |