watchdog.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_def.h>
#include <device/pci_ops.h>
#include <southbridge/intel/common/pmbase.h>
#include <southbridge/intel/common/tco.h>
#include <watchdog.h>
 
/*
 *  Disable ICH-NM10-PCH watchdog timer
 */
void watchdog_off(void)
{
        unsigned int value;
        struct device *dev;
 
        /* Get LPC device. */
        dev = pcidev_on_root(0x1f, 0);
 
        value = pci_read_config16(dev, PCI_COMMAND);
 
        /* Disable interrupt. */
        value |= PCI_COMMAND_INT_DISABLE;
        pci_write_config16(dev, PCI_COMMAND, value);
 
        /* Disable the watchdog timer. */
        value = read_pmbase16(PMBASE_TCO_OFFSET + TCO1_CNT);
        value |= TCO_TMR_HLT;
        write_pmbase16(PMBASE_TCO_OFFSET + TCO1_CNT, value);
 
        /* Clear TCO timeout status. */
        write_pmbase16(PMBASE_TCO_OFFSET + TCO1_STS, TCO1_TIMEOUT);
        write_pmbase16(PMBASE_TCO_OFFSET + TCO2_STS, SECOND_TO_STS);
 
        printk(BIOS_DEBUG, "ICH-NM10-PCH: watchdog disabled\n");
}