src/northbridge/intel/sandybridge/romstage.c

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

#include <console/console.h>
#include <cf9_reset.h>
#include <device/pci_ops.h>
#include <romstage_handoff.h>
#include "sandybridge.h"
#include <arch/romstage.h>
#include <device/pci_def.h>
#include <device/device.h>
#include <northbridge/intel/sandybridge/chip.h>
#include <security/intel/txt/txt.h>
#include <security/intel/txt/txt_platform.h>
#include <security/intel/txt/txt_register.h>
#include <southbridge/intel/bd82x6x/pch.h>
#include <southbridge/intel/common/pmclib.h>
#include <elog.h>

__weak void mainboard_early_init(int s3resume)
{
}

__weak void mainboard_late_rcba_config(void)
{
}

static void configure_dpr(void)
{
	union dpr_register dpr = txt_get_chipset_dpr();

	/*
	 * Just need to program the size of DPR, enable and lock it.
	 * The dpr.top will always point to TSEG_BASE (updated by hardware).
	 * We do it early because it will be needed later to calculate cbmem_top.
	 */
	dpr.lock = 1;
	dpr.epm = 1;
	dpr.size = CONFIG_INTEL_TXT_DPR_SIZE;
	pci_write_config32(HOST_BRIDGE, DPR, dpr.raw);
}

static void early_pch_reset_pmcon(void)
{
	/* Reset RTC power status */
	pci_and_config8(PCH_LPC_DEV, GEN_PMCON_3, ~(1 << 2));
}

/* The romstage entry point for this platform is not mainboard-specific, hence the name */
void mainboard_romstage_entry(void)
{
	int s3resume = 0;

	if (mchbar_read16(SSKPD_HI) == 0xcafe)
		system_reset();

	/* Init LPC, GPIO, BARs, disable watchdog ... */
	early_pch_init();

	/* When using MRC, USB is initialized by MRC */
	if (CONFIG(USE_NATIVE_RAMINIT)) {
		early_usb_init();
	}

	/* Perform some early chipset init needed before RAM initialization can work */
	systemagent_early_init();
	printk(BIOS_DEBUG, "Back from systemagent_early_init()\n");

	s3resume = southbridge_detect_s3_resume();

	elog_boot_notify(s3resume);

	post_code(0x38);

	mainboard_early_init(s3resume);

	post_code(0x39);

	if (CONFIG(INTEL_TXT)) {
		configure_dpr();
		intel_txt_romstage_init();
	}

	perform_raminit(s3resume);

	post_code(0x3b);
	/* Perform some initialization that must run before stage2 */
	early_pch_reset_pmcon();
	post_code(0x3c);

	southbridge_configure_default_intmap();
	southbridge_rcba_config();
	mainboard_late_rcba_config();

	post_code(0x3d);

	northbridge_romstage_finalize();

	post_code(0x3f);

	romstage_handoff_init(s3resume);
}