diff options
Diffstat (limited to 'drivers/rtc/mcfrtc.c')
| -rw-r--r-- | drivers/rtc/mcfrtc.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/drivers/rtc/mcfrtc.c b/drivers/rtc/mcfrtc.c new file mode 100644 index 0000000..27386e5 --- /dev/null +++ b/drivers/rtc/mcfrtc.c @@ -0,0 +1,121 @@ +/* + * Copyright (C) 2004-2007 Freescale Semiconductor, Inc. + * TsiChung Liew (Tsi-Chung.Liew@freescale.com) + * + * 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_MCFRTC) && defined(CONFIG_CMD_DATE) + +#include <command.h> +#include <rtc.h> +#include <asm/immap.h> +#include <asm/rtc.h> + +#undef RTC_DEBUG + +#ifndef CFG_MCFRTC_BASE +#error RTC_BASE is not defined! +#endif + +#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) +#define STARTOFTIME 1970 + +void rtc_get(struct rtc_time *tmp) +{ + volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE); + + int rtc_days, rtc_hrs, rtc_mins; + int tim; + + rtc_days = rtc->days; + rtc_hrs = rtc->hourmin >> 8; + rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin); + + tim = (rtc_days * 24) + rtc_hrs; + tim = (tim * 60) + rtc_mins; + tim = (tim * 60) + rtc->seconds; + + to_tm(tim, tmp); + + 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 +} + +void rtc_set(struct rtc_time *tmp) +{ + volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE); + + static int month_days[12] = { + 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 + }; + int days, i, months; + + if (tmp->tm_year > 2037) { + printf("Unable to handle. Exceeding integer limitation!\n"); + tmp->tm_year = 2027; + } +#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 + + /* calculate days by years */ + for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) { + days += 365 + isleap(i); + } + + /* calculate days by months */ + months = tmp->tm_mon - 1; + for (i = 0; i < months; i++) { + days += month_days[i]; + + if (i == 1) + days += isleap(i); + } + + days += tmp->tm_mday - 1; + + rtc->days = days; + rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min; + rtc->seconds = tmp->tm_sec; +} + +void rtc_reset(void) +{ + volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE); + + if ((rtc->cr & RTC_CR_EN) == 0) { + printf("real-time-clock was stopped. Now starting...\n"); + rtc->cr |= RTC_CR_EN; + } + + rtc->cr |= RTC_CR_SWR; +} + +#endif /* CONFIG_MCFRTC && CONFIG_CMD_DATE */ |