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-/*
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- * Copyright 2001 MontaVista Software Inc.
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- * Author: MontaVista Software, Inc.
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- * ahennessy@mvista.com
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- *
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- * arch/mips/jmr3927/common/rtc_ds1742.c
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- * Based on arch/mips/ddb5xxx/common/rtc_ds1386.c
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- * low-level RTC hookups for s for Dallas 1742 chip.
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- *
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- * Copyright (C) 2000-2001 Toshiba Corporation
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License as published by the
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- * Free Software Foundation; either version 2 of the License, or (at your
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- * option) any later version.
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- *
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- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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- *
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- * You should have received a copy of the GNU General Public License along
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- * with this program; if not, write to the Free Software Foundation, Inc.,
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- * 675 Mass Ave, Cambridge, MA 02139, USA.
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- */
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-
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-
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-/*
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- * This file exports a function, rtc_ds1386_init(), which expects an
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- * uncached base address as the argument. It will set the two function
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- * pointers expected by the MIPS generic timer code.
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- */
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-
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-#include <linux/bcd.h>
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-#include <linux/types.h>
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-#include <linux/time.h>
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-#include <linux/rtc.h>
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-#include <linux/ds1742rtc.h>
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-
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-#include <asm/time.h>
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-#include <asm/addrspace.h>
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-
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-#include <asm/debug.h>
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-
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-#define EPOCH 2000
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-
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-static unsigned long rtc_base;
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-
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-static unsigned long
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-rtc_ds1742_get_time(void)
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-{
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- unsigned int year, month, day, hour, minute, second;
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- unsigned int century;
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- unsigned long flags;
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-
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- spin_lock_irqsave(&rtc_lock, flags);
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- rtc_write(RTC_READ, RTC_CONTROL);
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- second = BCD2BIN(rtc_read(RTC_SECONDS) & RTC_SECONDS_MASK);
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- minute = BCD2BIN(rtc_read(RTC_MINUTES));
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- hour = BCD2BIN(rtc_read(RTC_HOURS));
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- day = BCD2BIN(rtc_read(RTC_DATE));
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- month = BCD2BIN(rtc_read(RTC_MONTH));
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- year = BCD2BIN(rtc_read(RTC_YEAR));
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- century = BCD2BIN(rtc_read(RTC_CENTURY) & RTC_CENTURY_MASK);
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- rtc_write(0, RTC_CONTROL);
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- spin_unlock_irqrestore(&rtc_lock, flags);
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-
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- year += century * 100;
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-
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- return mktime(year, month, day, hour, minute, second);
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-}
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-extern void to_tm(unsigned long tim, struct rtc_time * tm);
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-
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-static int
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-rtc_ds1742_set_time(unsigned long t)
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-{
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- struct rtc_time tm;
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- u8 year, month, day, hour, minute, second;
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- u8 cmos_year, cmos_month, cmos_day, cmos_hour, cmos_minute, cmos_second;
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- int cmos_century;
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- unsigned long flags;
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-
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- spin_lock_irqsave(&rtc_lock, flags);
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- rtc_write(RTC_READ, RTC_CONTROL);
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- cmos_second = (u8)(rtc_read(RTC_SECONDS) & RTC_SECONDS_MASK);
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- cmos_minute = (u8)rtc_read(RTC_MINUTES);
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- cmos_hour = (u8)rtc_read(RTC_HOURS);
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- cmos_day = (u8)rtc_read(RTC_DATE);
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- cmos_month = (u8)rtc_read(RTC_MONTH);
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- cmos_year = (u8)rtc_read(RTC_YEAR);
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- cmos_century = rtc_read(RTC_CENTURY) & RTC_CENTURY_MASK;
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-
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- rtc_write(RTC_WRITE, RTC_CONTROL);
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-
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- /* convert */
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- to_tm(t, &tm);
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-
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- /* check each field one by one */
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- year = BIN2BCD(tm.tm_year - EPOCH);
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- if (year != cmos_year) {
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- rtc_write(year,RTC_YEAR);
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- }
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-
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- month = BIN2BCD(tm.tm_mon);
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- if (month != (cmos_month & 0x1f)) {
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- rtc_write((month & 0x1f) | (cmos_month & ~0x1f),RTC_MONTH);
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- }
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-
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- day = BIN2BCD(tm.tm_mday);
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- if (day != cmos_day) {
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-
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- rtc_write(day, RTC_DATE);
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- }
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-
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- if (cmos_hour & 0x40) {
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- /* 12 hour format */
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- hour = 0x40;
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- if (tm.tm_hour > 12) {
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- hour |= 0x20 | (BIN2BCD(hour-12) & 0x1f);
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- } else {
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- hour |= BIN2BCD(tm.tm_hour);
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- }
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- } else {
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- /* 24 hour format */
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- hour = BIN2BCD(tm.tm_hour) & 0x3f;
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- }
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- if (hour != cmos_hour) rtc_write(hour, RTC_HOURS);
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-
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- minute = BIN2BCD(tm.tm_min);
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- if (minute != cmos_minute) {
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- rtc_write(minute, RTC_MINUTES);
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- }
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-
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- second = BIN2BCD(tm.tm_sec);
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- if (second != cmos_second) {
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- rtc_write(second & RTC_SECONDS_MASK,RTC_SECONDS);
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- }
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-
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- /* RTC_CENTURY and RTC_CONTROL share same address... */
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- rtc_write(cmos_century, RTC_CONTROL);
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- spin_unlock_irqrestore(&rtc_lock, flags);
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-
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- return 0;
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-}
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-
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-void
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-rtc_ds1742_init(unsigned long base)
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-{
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- u8 cmos_second;
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-
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- /* remember the base */
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- rtc_base = base;
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- db_assert((rtc_base & 0xe0000000) == KSEG1);
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-
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- /* set the function pointers */
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- rtc_mips_get_time = rtc_ds1742_get_time;
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- rtc_mips_set_time = rtc_ds1742_set_time;
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-
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- /* clear oscillator stop bit */
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- rtc_write(RTC_READ, RTC_CONTROL);
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- cmos_second = (u8)(rtc_read(RTC_SECONDS) & RTC_SECONDS_MASK);
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- rtc_write(RTC_WRITE, RTC_CONTROL);
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- rtc_write(cmos_second, RTC_SECONDS); /* clear msb */
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- rtc_write(0, RTC_CONTROL);
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-}
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Atsushi Nemoto