RTC driver for the S3C24XX SoCs.
Signed-off-by: José Miguel Gonçalves jose.goncalves@inov.pt --- drivers/rtc/Makefile | 1 + drivers/rtc/s3c24xx_rtc.c | 166 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 167 insertions(+) create mode 100644 drivers/rtc/s3c24xx_rtc.c
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 8316e8f..bd8b1eb 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -69,6 +69,7 @@ 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-$(CONFIG_RTC_S3C24XX) += s3c24xx_rtc.o COBJS-$(CONFIG_RTC_S3C44B0) += s3c44b0_rtc.o COBJS-$(CONFIG_RTC_X1205) += x1205.o
diff --git a/drivers/rtc/s3c24xx_rtc.c b/drivers/rtc/s3c24xx_rtc.c new file mode 100644 index 0000000..3844e44 --- /dev/null +++ b/drivers/rtc/s3c24xx_rtc.c @@ -0,0 +1,166 @@ +/* + * (C) Copyright 2012 INOV - INESC Inovacao + * Jose Goncalves jose.goncalves@inov.pt + * + * Based on drivers/rtc/s3c24x0_rtc.c + * + * 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> + +#if defined(CONFIG_CMD_DATE) + +#include <rtc.h> +#include <asm/io.h> +#include <asm/arch/s3c24xx_cpu.h> + +static inline void rtc_access_enable(void) +{ + s3c24xx_rtc *const rtc = s3c24xx_get_base_rtc(); + uchar rtccon; + + rtccon = readb(&rtc->rtccon); + rtccon |= 0x01; + writeb(rtccon, &rtc->rtccon); +} + +static inline void rtc_access_disable(void) +{ + s3c24xx_rtc *const rtc = s3c24xx_get_base_rtc(); + uchar rtccon; + + rtccon = readb(&rtc->rtccon); + rtccon &= ~0x01; + writeb(rtccon, &rtc->rtccon); +} + +/* ------------------------------------------------------------------------- */ + +int rtc_get(struct rtc_time *tmp) +{ + s3c24xx_rtc *const rtc = s3c24xx_get_base_rtc(); + uchar sec, min, hour, mday, wday, mon, year; + int have_retried = 0; + + rtc_access_enable(); + + /* Read RTC registers */ +retry_get_time: + min = readb(&rtc->bcdmin); + hour = readb(&rtc->bcdhour); + mday = readb(&rtc->bcddate); + wday = readb(&rtc->bcdday); + mon = readb(&rtc->bcdmon); + year = readb(&rtc->bcdyear); + sec = readb(&rtc->bcdsec); + + /* The only way to work out whether the RTC was mid-update + * when we read it is to check the seconds counter. + * If it's zero, then we re-try the entire read. + */ + if (rtc->bcdsec == 0 && !have_retried) { + have_retried = 1; + goto retry_get_time; + } + + rtc_access_disable(); + + debug("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " + "hr: %02x min: %02x sec: %02x\n", + year, mon, mday, wday, hour, min, sec); + + tmp->tm_sec = bcd2bin(sec & 0x7F); + tmp->tm_min = bcd2bin(min & 0x7F); + tmp->tm_hour = bcd2bin(hour & 0x3F); + tmp->tm_mday = bcd2bin(mday & 0x3F); + tmp->tm_wday = bcd2bin(wday & 0x07); + tmp->tm_mon = bcd2bin(mon & 0x1F); + tmp->tm_year = bcd2bin(year); + if (tmp->tm_year < 70) + tmp->tm_year += 2000; + else + tmp->tm_year += 1900; + tmp->tm_yday = 0; + tmp->tm_isdst = 0; + + debug("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); + + return 0; +} + +int rtc_set(struct rtc_time *tmp) +{ + s3c24xx_rtc *const rtc = s3c24xx_get_base_rtc(); + uchar sec, min, hour, mday, wday, mon, year; + + debug("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); + + if (tmp->tm_year < 1970 || tmp->tm_year > 2069) { + puts("ERROR: year should be between 1970 and 2069!\n"); + return -1; + } + + year = bin2bcd(tmp->tm_year % 100); + mon = bin2bcd(tmp->tm_mon); + wday = bin2bcd(tmp->tm_wday); + mday = bin2bcd(tmp->tm_mday); + hour = bin2bcd(tmp->tm_hour); + min = bin2bcd(tmp->tm_min); + sec = bin2bcd(tmp->tm_sec); + + debug("Set RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " + "hr: %02x min: %02x sec: %02x\n", + year, mon, mday, wday, hour, min, sec); + + rtc_access_enable(); + + /* Write RTC registers */ + writeb(sec, &rtc->bcdsec); + writeb(min, &rtc->bcdmin); + writeb(hour, &rtc->bcdhour); + writeb(mday, &rtc->bcddate); + writeb(wday, &rtc->bcdday); + writeb(mon, &rtc->bcdmon); + writeb(year, &rtc->bcdyear); + + rtc_access_disable(); + + return 0; +} + +void rtc_reset(void) +{ + s3c24xx_rtc *const rtc = s3c24xx_get_base_rtc(); + uchar rtccon; + + rtccon = readb(&rtc->rtccon); + rtccon &= ~0x06; + rtccon |= 0x08; + writeb(rtccon, &rtc->rtccon); + rtccon = readb(&rtc->rtccon); + rtccon &= ~0x08; + writeb(rtccon, &rtc->rtccon); +} + +#endif