coreboot-kgpe-d16/src/soc/intel/skylake/reset.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <cf9_reset.h>
#include <intelblocks/pmclib.h>
#include <soc/intel/common/reset.h>
#include <soc/me.h>
#include <soc/pm.h>

static void do_force_global_reset(void)
{
	/*
	 * BIOS should ensure it does a global reset
	 * to reset both host and Intel ME by setting
	 * PCH PMC [B0:D31:F2 register offset 0xAC bit 20]
	 */
	pmc_global_reset_enable(true);

	/* Now BIOS can write 0x06 or 0x0E to 0xCF9 port
	 * to global reset platform */
	do_full_reset();
}

void do_global_reset(void)
{
	if (!send_global_reset()) {
		/* If ME unable to reset platform then
		 * force global reset using PMC CF9GR register*/
		do_force_global_reset();
	}
}