92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* Copyright 2014 The Chromium OS Authors. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <bcd.h>
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#include <console/console.h>
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#include <device/i2c.h>
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#include <rtc.h>
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#include <stdint.h>
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enum AS3722_RTC_REG
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{
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AS3722_RTC_CONTROL = 0x60,
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AS3722_RTC_SECOND = 0x61,
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AS3722_RTC_MINUTE = 0x62,
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AS3722_RTC_HOUR = 0x63,
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AS3722_RTC_DAY = 0x64,
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AS3722_RTC_MONTH = 0x65,
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AS3722_RTC_YEAR = 0x66
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};
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enum {
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AS3722_RTC_CONTROL_ON = 0x1 << 2
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};
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static uint8_t as3722_read(enum AS3722_RTC_REG reg)
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{
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uint8_t val;
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i2c_readb(CONFIG_DRIVERS_AS3722_RTC_BUS,
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CONFIG_DRIVERS_AS3722_RTC_ADDR, reg, &val);
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return val;
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}
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static void as3722_write(enum AS3722_RTC_REG reg, uint8_t val)
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{
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i2c_writeb(CONFIG_DRIVERS_AS3722_RTC_BUS,
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CONFIG_DRIVERS_AS3722_RTC_ADDR, reg, val);
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}
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static void as3722rtc_init(void)
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{
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static int initialized;
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if (initialized)
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return;
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uint8_t control = as3722_read(AS3722_RTC_CONTROL);
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as3722_write(AS3722_RTC_CONTROL, control | AS3722_RTC_CONTROL_ON);
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initialized = 1;
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}
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int rtc_set(const struct rtc_time *time)
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{
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as3722rtc_init();
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as3722_write(AS3722_RTC_SECOND, bin2bcd(time->sec));
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as3722_write(AS3722_RTC_MINUTE, bin2bcd(time->min));
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as3722_write(AS3722_RTC_HOUR, bin2bcd(time->hour));
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as3722_write(AS3722_RTC_DAY, bin2bcd(time->mday));
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as3722_write(AS3722_RTC_MONTH, bin2bcd(time->mon + 1));
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as3722_write(AS3722_RTC_YEAR, bin2bcd(time->year));
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return 0;
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}
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int rtc_get(struct rtc_time *time)
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{
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as3722rtc_init();
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time->sec = bcd2bin(as3722_read(AS3722_RTC_SECOND) & 0x7f);
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time->min = bcd2bin(as3722_read(AS3722_RTC_MINUTE) & 0x7f);
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time->hour = bcd2bin(as3722_read(AS3722_RTC_HOUR) & 0x3f);
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time->mday = bcd2bin(as3722_read(AS3722_RTC_DAY) & 0x3f);
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time->mon = bcd2bin(as3722_read(AS3722_RTC_MONTH) & 0x1f) - 1;
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time->year = bcd2bin(as3722_read(AS3722_RTC_YEAR) & 0x7f);
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return 0;
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}
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