/* * 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; }