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/*
* Faraday FTRTC010 Real Time Clock
*
* (C) Copyright 2009 Faraday Technology
* Po-Yu Chuang <ratbert@faraday-tech.com>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
#include <common.h>
#include <rtc.h>
#include <asm/io.h>
struct ftrtc010 {
unsigned int sec; /* 0x00 */
unsigned int min; /* 0x04 */
unsigned int hour; /* 0x08 */
unsigned int day; /* 0x0c */
unsigned int alarm_sec; /* 0x10 */
unsigned int alarm_min; /* 0x14 */
unsigned int alarm_hour; /* 0x18 */
unsigned int record; /* 0x1c */
unsigned int cr; /* 0x20 */
};
/*
* RTC Control Register
*/
#define FTRTC010_CR_ENABLE (1 << 0)
#define FTRTC010_CR_INTERRUPT_SEC (1 << 1) /* per second irq */
#define FTRTC010_CR_INTERRUPT_MIN (1 << 2) /* per minute irq */
#define FTRTC010_CR_INTERRUPT_HR (1 << 3) /* per hour irq */
#define FTRTC010_CR_INTERRUPT_DAY (1 << 4) /* per day irq */
static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE;
static void ftrtc010_enable (void)
{
writel (FTRTC010_CR_ENABLE, &rtc->cr);
}
/*
* return current time in seconds
*/
static unsigned long ftrtc010_time (void)
{
unsigned long day;
unsigned long hour;
unsigned long minute;
unsigned long second;
unsigned long second2;
do {
second = readl (&rtc->sec);
day = readl (&rtc->day);
hour = readl (&rtc->hour);
minute = readl (&rtc->min);
second2 = readl (&rtc->sec);
} while (second != second2);
return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second;
}
/*
* Get the current time from the RTC
*/
int rtc_get (struct rtc_time *tmp)
{
unsigned long now;
debug ("%s(): record register: %x\n",
__func__, readl (&rtc->record));
now = ftrtc010_time () + readl (&rtc->record);
to_tm (now, tmp);
return 0;
}
/*
* Set the RTC
*/
int rtc_set (struct rtc_time *tmp)
{
unsigned long new;
unsigned long now;
debug ("%s(): DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
__func__,
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
new = mktime (tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour,
tmp->tm_min, tmp->tm_sec);
now = ftrtc010_time ();
debug ("%s(): write %lx to record register\n", __func__, new - now);
writel (new - now, &rtc->record);
return 0;
}
void rtc_reset (void)
{
debug ("%s()\n", __func__);
ftrtc010_enable ();
}
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