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/*
* This file is part of the coreboot project.
*
* Copyright 2013 Google Inc.
*
* 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 <console/console.h>
#include <device/pci_def.h>
#include <device/pci_ops.h>
#include <security/vboot/vbnv.h>
#include <pc80/mc146818rtc.h>
#include <elog.h>
#include "pmutil.h"
#include "rtc.h"
/* PCI Configuration Space (D31:F0): LPC */
#if defined(__SIMPLE_DEVICE__)
#define PCH_LPC_DEV PCI_DEV(0, 0x1f, 0)
#else
#define PCH_LPC_DEV dev_find_slot(0, PCI_DEVFN(0x1f, 0))
#endif
int rtc_failure(void)
{
return !!(pci_read_config8(PCH_LPC_DEV, D31F0_GEN_PMCON_3)
& RTC_BATTERY_DEAD);
}
void sb_rtc_init(void)
{
int rtc_failed = rtc_failure();
if (rtc_failed) {
if (IS_ENABLED(CONFIG_ELOG))
elog_add_event(ELOG_TYPE_RTC_RESET);
pci_update_config8(PCH_LPC_DEV, D31F0_GEN_PMCON_3,
~RTC_BATTERY_DEAD, 0);
}
printk(BIOS_DEBUG, "RTC: failed = 0x%x\n", rtc_failed);
cmos_init(rtc_failed);
}
int vbnv_cmos_failed(void)
{
return rtc_failure();
}
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