rtc.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#define __SIMPLE_DEVICE__
 
#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"
 
#define PCH_LPC_DEV     PCI_DEV(0, 0x1f, 0)
 
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 (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();
}