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/*
* This file is part of the coreboot project.
*
* Copyright 2014 The Chromium OS Authors. All rights reserved.
*
* 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; version 2 of the License.
*
* 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.
*/
#include <bcd.h>
#include <console/console.h>
#include <device/i2c_simple.h>
#include <rtc.h>
#include <stdint.h>
enum AS3722_RTC_REG
{
AS3722_RTC_CONTROL = 0x60,
AS3722_RTC_SECOND = 0x61,
AS3722_RTC_MINUTE = 0x62,
AS3722_RTC_HOUR = 0x63,
AS3722_RTC_DAY = 0x64,
AS3722_RTC_MONTH = 0x65,
AS3722_RTC_YEAR = 0x66
};
enum {
AS3722_RTC_CONTROL_ON = 0x1 << 2
};
static uint8_t as3722_read(enum AS3722_RTC_REG reg)
{
uint8_t val;
i2c_readb(CONFIG_DRIVERS_AS3722_RTC_BUS,
CONFIG_DRIVERS_AS3722_RTC_ADDR, reg, &val);
return val;
}
static void as3722_write(enum AS3722_RTC_REG reg, uint8_t val)
{
i2c_writeb(CONFIG_DRIVERS_AS3722_RTC_BUS,
CONFIG_DRIVERS_AS3722_RTC_ADDR, reg, val);
}
static void as3722rtc_init(void)
{
static int initialized;
if (initialized)
return;
uint8_t control = as3722_read(AS3722_RTC_CONTROL);
as3722_write(AS3722_RTC_CONTROL, control | AS3722_RTC_CONTROL_ON);
initialized = 1;
}
int rtc_set(const struct rtc_time *time)
{
as3722rtc_init();
as3722_write(AS3722_RTC_SECOND, bin2bcd(time->sec));
as3722_write(AS3722_RTC_MINUTE, bin2bcd(time->min));
as3722_write(AS3722_RTC_HOUR, bin2bcd(time->hour));
as3722_write(AS3722_RTC_DAY, bin2bcd(time->mday));
as3722_write(AS3722_RTC_MONTH, bin2bcd(time->mon));
as3722_write(AS3722_RTC_YEAR, bin2bcd(time->year));
return 0;
}
int rtc_get(struct rtc_time *time)
{
as3722rtc_init();
time->sec = bcd2bin(as3722_read(AS3722_RTC_SECOND) & 0x7f);
time->min = bcd2bin(as3722_read(AS3722_RTC_MINUTE) & 0x7f);
time->hour = bcd2bin(as3722_read(AS3722_RTC_HOUR) & 0x3f);
time->mday = bcd2bin(as3722_read(AS3722_RTC_DAY) & 0x3f);
time->mon = bcd2bin(as3722_read(AS3722_RTC_MONTH) & 0x1f);
time->year = bcd2bin(as3722_read(AS3722_RTC_YEAR) & 0x7f);
return 0;
}
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