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- /*
- * Copyright (C) 2011
- * Jason Cooper <u-boot@lakedaemon.net>
- *
- * 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 Marvell Integrated RTC
- */
- #include <common.h>
- #include <command.h>
- #include <rtc.h>
- #include <asm/io.h>
- #include "mvrtc.h"
- /* This RTC does not support century, so we assume 20 */
- #define CENTURY 20
- int rtc_get(struct rtc_time *t)
- {
- u32 time;
- u32 date;
- struct mvrtc_registers *mvrtc_regs;
- mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
- /* read the time register */
- time = readl(&mvrtc_regs->time);
- /* read the date register */
- date = readl(&mvrtc_regs->date);
- /* test for 12 hour clock (can't tell if it's am/pm) */
- if (time & MVRTC_HRFMT_MSK) {
- printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n");
- return -1;
- }
- /* time */
- t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
- t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK);
- t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK);
- t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK);
- t->tm_wday--;
- /* date */
- t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK);
- t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK);
- t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK);
- t->tm_year += CENTURY * 100;
- /* not supported in this RTC */
- t->tm_yday = 0;
- t->tm_isdst = 0;
- return 0;
- }
- int rtc_set(struct rtc_time *t)
- {
- u32 time = 0; /* sets hour format bit to zero, 24hr format. */
- u32 date = 0;
- struct mvrtc_registers *mvrtc_regs;
- mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
- /* check that this code isn't 80+ years old ;-) */
- if ((t->tm_year / 100) != CENTURY)
- printf("Warning: Only century %d supported.\n", CENTURY);
- /* time */
- time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT;
- time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT;
- time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT;
- time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT;
- /* date */
- date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT;
- date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT;
- date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT;
- /* write the time register */
- writel(time, &mvrtc_regs->time);
- /* write the date register */
- writel(date, &mvrtc_regs->date);
- return 0;
- }
- void rtc_reset(void)
- {
- u32 time;
- u32 sec;
- struct mvrtc_registers *mvrtc_regs;
- mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
- /* no init routine for this RTC needed, just check that it's working */
- time = readl(&mvrtc_regs->time);
- sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
- udelay(1000000);
- time = readl(&mvrtc_regs->time);
- if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK))
- printf("Error: RTC did not increment.\n");
- }
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