ptt.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <soc/pci_devs.h>
#include <device/pci_ops.h>
#include <console/console.h>
 
#include "ptt.h"
 
#define PCI_ME_HFSTS4 0x64
#define PTT_ENABLE (1 << 19)
 
/* Dump Intel ME register */
static uint32_t read_register(int reg_addr)
{
        if (!PCH_DEV_CSE)
                return 0xFFFFFFFF;
 
        return pci_read_config32(PCH_DEV_CSE, reg_addr);
}
 
/*
 * ptt_active()
 *
 * Check if PTT Flag is set - so that PTT is active.
 *
 * Return true if active, false otherwise.
 */
bool ptt_active(void)
{
        uint32_t fwsts4 = read_register(PCI_ME_HFSTS4);
 
        if (fwsts4 == 0xFFFFFFFF)
                return false;
 
        if ((fwsts4 & PTT_ENABLE) == 0) {
                printk(BIOS_DEBUG, "Intel ME Establishment bit not valid.\n");
                return false;
        }
 
        return true;
}