diff options
Diffstat (limited to 'u-boot/drivers/rtc/s3c24x0_rtc.c')
| -rw-r--r-- | u-boot/drivers/rtc/s3c24x0_rtc.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/u-boot/drivers/rtc/s3c24x0_rtc.c b/u-boot/drivers/rtc/s3c24x0_rtc.c new file mode 100644 index 0000000..7f02f05 --- /dev/null +++ b/u-boot/drivers/rtc/s3c24x0_rtc.c @@ -0,0 +1,170 @@ +/* + * (C) Copyright 2003 + * David Müller ELSOFT AG Switzerland. d.mueller@elsoft.ch + * + * 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 + */ + +/* + * Date & Time support for the built-in Samsung S3C24X0 RTC + */ + +#include <common.h> +#include <command.h> + +#if (defined(CONFIG_CMD_DATE)) + +#include <asm/arch/s3c24x0_cpu.h> + +#include <rtc.h> +#include <asm/io.h> + +/*#define DEBUG*/ + +typedef enum { + RTC_ENABLE, + RTC_DISABLE +} RTC_ACCESS; + + +static inline void SetRTC_Access(RTC_ACCESS a) +{ + struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); + + switch (a) { + case RTC_ENABLE: + writeb(readb(&rtc->rtccon) | 0x01, &rtc->rtccon); + break; + + case RTC_DISABLE: + writeb(readb(&rtc->rtccon) & ~0x01, &rtc->rtccon); + break; + } +} + +/* ------------------------------------------------------------------------- */ + +int rtc_get(struct rtc_time *tmp) +{ + struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); + uchar sec, min, hour, mday, wday, mon, year; + uchar a_sec, a_min, a_hour, a_date, a_mon, a_year, a_armed; + + /* enable access to RTC registers */ + SetRTC_Access(RTC_ENABLE); + + /* read RTC registers */ + do { + sec = readb(&rtc->bcdsec); + min = readb(&rtc->bcdmin); + hour = readb(&rtc->bcdhour); + mday = readb(&rtc->bcddate); + wday = readb(&rtc->bcdday); + mon = readb(&rtc->bcdmon); + year = readb(&rtc->bcdyear); + } while (sec != readb(&rtc->bcdsec)); + + /* read ALARM registers */ + a_sec = readb(&rtc->almsec); + a_min = readb(&rtc->almmin); + a_hour = readb(&rtc->almhour); + a_date = readb(&rtc->almdate); + a_mon = readb(&rtc->almmon); + a_year = readb(&rtc->almyear); + a_armed = readb(&rtc->rtcalm); + + /* disable access to RTC registers */ + SetRTC_Access(RTC_DISABLE); + +#ifdef RTC_DEBUG + printf("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); + printf("Alarms: %02x: year: %02x month: %02x date: %02x hour: " + "%02x min: %02x sec: %02x\n", + a_armed, a_year, a_mon, a_date, a_hour, a_min, a_sec); +#endif + + 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_mon = bcd2bin(mon & 0x1F); + tmp->tm_year = bcd2bin(year); + tmp->tm_wday = bcd2bin(wday & 0x07); + if (tmp->tm_year < 70) + tmp->tm_year += 2000; + else + tmp->tm_year += 1900; + 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) +{ + struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); + uchar sec, min, hour, mday, wday, mon, year; + +#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 + 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); + + /* enable access to RTC registers */ + SetRTC_Access(RTC_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); + + /* disable access to RTC registers */ + SetRTC_Access(RTC_DISABLE); + + return 0; +} + +void rtc_reset(void) +{ + struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); + + writeb((readb(&rtc->rtccon) & ~0x06) | 0x08, &rtc->rtccon); + writeb(readb(&rtc->rtccon) & ~(0x08 | 0x01), &rtc->rtccon); +} + +#endif |