uboot-mt623x/drivers/rtc/pl031.c

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/*
* (C) Copyright 2008
* Gururaja Hebbar gururajakr@sanyo.co.in
*
* reference linux-2.6.20.6/drivers/rtc/rtc-pl031.c
*
* 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>
#include <command.h>
#include <rtc.h>
#if defined(CONFIG_CMD_DATE)
#ifndef CFG_RTC_PL031_BASE
#error CFG_RTC_PL031_BASE is not defined!
#endif
/*
* Register definitions
*/
#define RTC_DR 0x00 /* Data read register */
#define RTC_MR 0x04 /* Match register */
#define RTC_LR 0x08 /* Data load register */
#define RTC_CR 0x0c /* Control register */
#define RTC_IMSC 0x10 /* Interrupt mask and set register */
#define RTC_RIS 0x14 /* Raw interrupt status register */
#define RTC_MIS 0x18 /* Masked interrupt status register */
#define RTC_ICR 0x1c /* Interrupt clear register */
#define RTC_CR_START (1 << 0)
#define RTC_WRITE_REG(addr, val) \
(*(volatile unsigned int *)(CFG_RTC_PL031_BASE + (addr)) = (val))
#define RTC_READ_REG(addr) \
(*(volatile unsigned int *)(CFG_RTC_PL031_BASE + (addr)))
static int pl031_initted = 0;
/* Enable RTC Start in Control register*/
void rtc_init(void)
{
RTC_WRITE_REG(RTC_CR, RTC_CR_START);
pl031_initted = 1;
}
/*
* Reset the RTC. We set the date back to 1970-01-01.
*/
void rtc_reset(void)
{
RTC_WRITE_REG(RTC_LR, 0x00);
if(!pl031_initted)
rtc_init();
}
/*
* Set the RTC
*/
int rtc_set(struct rtc_time *tmp)
{
unsigned long tim;
if(!pl031_initted)
rtc_init();
if (tmp == NULL) {
puts("Error setting the date/time\n");
return -1;
}
/* Calculate number of seconds this incoming time represents */
tim = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
RTC_WRITE_REG(RTC_LR, tim);
return -1;
}
/*
* Get the current time from the RTC
*/
int rtc_get(struct rtc_time *tmp)
{
ulong tim;
if(!pl031_initted)
rtc_init();
if (tmp == NULL) {
puts("Error getting the date/time\n");
return -1;
}
tim = RTC_READ_REG(RTC_DR);
to_tm (tim, tmp);
debug ( "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);
return 0;
}
#endif