src/northbridge/intel/fsp_sandybridge/early_init.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2007-2010 coresystems GmbH
 * Copyright (C) 2011 Google Inc
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <stdint.h>
#include <stdlib.h>
#include <console/console.h>
#include <arch/io.h>
#include <device/pci_def.h>
#include <elog.h>
#include "northbridge.h"

static void sandybridge_setup_bars(void)
{
	printk(BIOS_DEBUG, "Setting up static northbridge registers...");
	/* Set up all hardcoded northbridge BARs */
	pci_write_config32(PCI_DEV(0, 0x00, 0), EPBAR, DEFAULT_EPBAR | 1);
	pci_write_config32(PCI_DEV(0, 0x00, 0), EPBAR + 4, (0LL+DEFAULT_EPBAR) >> 32);
	pci_write_config32(PCI_DEV(0, 0x00, 0), MCHBAR, (uintptr_t)DEFAULT_MCHBAR | 1);
	pci_write_config32(PCI_DEV(0, 0x00, 0), MCHBAR + 4, (0LL+(uintptr_t)DEFAULT_MCHBAR) >> 32);
	pci_write_config32(PCI_DEV(0, 0x00, 0), DMIBAR, (uintptr_t)DEFAULT_DMIBAR | 1);
	pci_write_config32(PCI_DEV(0, 0x00, 0), DMIBAR + 4, (0LL+(uintptr_t)DEFAULT_DMIBAR) >> 32);

	/* Set C0000-FFFFF to access RAM on both reads and writes */
	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM0, 0x30);
	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM1, 0x33);
	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM2, 0x33);
	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM3, 0x33);
	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM4, 0x33);
	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM5, 0x33);
	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM6, 0x33);

#if CONFIG_ELOG_BOOT_COUNT
	/* Increment Boot Counter for non-S3 resume */
	if ((inw(DEFAULT_PMBASE + PM1_STS) & WAK_STS) &&
	    ((inl(DEFAULT_PMBASE + PM1_CNT) >> 10) & 7) != SLP_TYP_S3)
		boot_count_increment();
#endif

	printk(BIOS_DEBUG, " done.\n");

#if CONFIG_ELOG_BOOT_COUNT
	/* Increment Boot Counter except when resuming from S3 */
	if ((inw(DEFAULT_PMBASE + PM1_STS) & WAK_STS) &&
	    ((inl(DEFAULT_PMBASE + PM1_CNT) >> 10) & 7) == SLP_TYP_S3)
		return;
	boot_count_increment();
#endif
}

void sandybridge_early_initialization(int chipset_type)
{
	u32 capid0_a;
	u8 reg8;

	/* Device ID Override Enable should be done very early */
	capid0_a = pci_read_config32(PCI_DEV(0, 0, 0), 0xe4);
	if (capid0_a & (1 << 10)) {
		reg8 = pci_read_config8(PCI_DEV(0, 0, 0), 0xf3);
		reg8 &= ~7; /* Clear 2:0 */

		if (chipset_type == SANDYBRIDGE_MOBILE)
			reg8 |= 1; /* Set bit 0 */

		pci_write_config8(PCI_DEV(0, 0, 0), 0xf3, reg8);
	}

	/* Setup all BARs required for early PCIe and raminit */
	sandybridge_setup_bars();
}