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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2017 Intel Corporation.
*
* 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 <compiler.h>
#include <intelblocks/pcr.h>
#include <intelblocks/rtc.h>
#include <soc/pcr_ids.h>
#include <pc80/mc146818rtc.h>
/* RTC PCR configuration */
#define PCR_RTC_CONF 0x3400
#define PCR_RTC_CONF_UCMOS_EN (1 << 2)
#define PCR_RTC_CONF_LCMOS_LOCK (1 << 3)
#define PCR_RTC_CONF_UCMOS_LOCK (1 << 4)
#define PCR_RTC_CONF_RESERVED (1 << 31)
/* RTC backed up control register */
#define PCR_RTC_BUC 0x3414
#define PCR_RTC_BUC_TOP_SWAP (1 << 0)
void enable_rtc_upper_bank(void)
{
/* Enable upper 128 bytes of CMOS */
pcr_or32(PID_RTC, PCR_RTC_CONF, PCR_RTC_CONF_UCMOS_EN);
}
__weak int soc_get_rtc_failed(void)
{
return 0;
}
void rtc_init(void)
{
/* Ensure the date is set including century byte. */
cmos_check_update_date();
cmos_init(soc_get_rtc_failed());
}
#if IS_ENABLED(CONFIG_INTEL_HAS_TOP_SWAP)
void configure_rtc_buc_top_swap(enum ts_config ts_state)
{
pcr_rmw32(PID_RTC, PCR_RTC_BUC, ~PCR_RTC_BUC_TOP_SWAP, ts_state);
}
enum ts_config get_rtc_buc_top_swap_status(void)
{
if (pcr_read32(PID_RTC, PCR_RTC_BUC) & PCR_RTC_BUC_TOP_SWAP)
return TS_ENABLE;
else
return TS_DISABLE;
}
#endif
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