/* * 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"); }