src/soc/intel/broadwell/finalize.c

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

#include <bootstate.h>
#include <console/console.h>
#include <console/post_codes.h>
#include <device/pci_ops.h>
#include <soc/pci_devs.h>
#include <soc/pch.h>
#include <soc/systemagent.h>

/*
 * 16.6 System Agent Configuration Locking
 * "5th Generation Intel Core Processor Family BIOS Specification"
 * Document Number 535094
 * Revision 2.2.0, August 2014
 *
 * To ease reading, first lock PCI registers, then MCHBAR registers.
 * Write the MC Lock register first, since more than one bit gets set.
 */
static void broadwell_systemagent_finalize(void)
{
	struct device *const host_bridge = pcidev_path_on_root(SA_DEVFN_ROOT);

	pci_or_config16(host_bridge, GGC,         1 << 0);
	pci_or_config32(host_bridge, DPR,         1 << 0);
	pci_or_config32(host_bridge, MESEG_LIMIT, 1 << 10);
	pci_or_config32(host_bridge, REMAPBASE,   1 << 0);
	pci_or_config32(host_bridge, REMAPLIMIT,  1 << 0);
	pci_or_config32(host_bridge, TOM,         1 << 0);
	pci_or_config32(host_bridge, TOUUD,       1 << 0);
	pci_or_config32(host_bridge, BDSM,        1 << 0);
	pci_or_config32(host_bridge, BGSM,        1 << 0);
	pci_or_config32(host_bridge, TSEG,        1 << 0);
	pci_or_config32(host_bridge, TOLUD,       1 << 0);

	MCHBAR32(0x50fc) |= 0x8f;	/* MC */
	MCHBAR32(0x5500) |= 1 << 0;	/* PAVP */
	MCHBAR32(0x5880) |= 1 << 5;	/* DDR PTM */
	MCHBAR32(0x7000) |= 1 << 31;
	MCHBAR32(0x77fc) |= 1 << 0;
	MCHBAR32(0x7ffc) |= 1 << 0;
	MCHBAR32(0x6800) |= 1 << 31;
	MCHBAR32(0x6020) |= 1 << 0;	/* UMA GFX */
	MCHBAR32(0x63fc) |= 1 << 0;	/* VTDTRK */

	/* Read+write the following */
	MCHBAR32(0x6030) = MCHBAR32(0x6030);
	MCHBAR32(0x6034) = MCHBAR32(0x6034);
	MCHBAR32(0x6008) = MCHBAR32(0x6008);
}

static void broadwell_finalize(void *unused)
{
	printk(BIOS_DEBUG, "Finalizing chipset.\n");

	broadwell_systemagent_finalize();

	broadwell_pch_finalize();

	/* Indicate finalize step with post code */
	post_code(POST_OS_BOOT);
}

BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_ENTRY, broadwell_finalize, NULL);
BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT, broadwell_finalize, NULL);