coreboot-kgpe-d16/src/southbridge/intel/i82801gx/bootblock.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2011 Sven Schnelle <svens@stackframe.org>
 *
 * 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 <device/pci_ops.h>
#include "i82801gx.h"

static void enable_spi_prefetch(void)
{
	u8 reg8;
	pci_devfn_t dev;

	dev = PCI_DEV(0, 0x1f, 0);

	reg8 = pci_read_config8(dev, BIOS_CNTL);
	reg8 &= ~(3 << 2);
	reg8 |= (2 << 2); /* Prefetching and Caching Enabled */
	pci_write_config8(dev, BIOS_CNTL, reg8);
}

static void bootblock_southbridge_init(void)
{
	enable_spi_prefetch();

	/* Enable RCBA */
	pci_write_config32(PCI_DEV(0, 0x1f, 0), RCBA, (uintptr_t)DEFAULT_RCBA | 1);

	/* Enable upper 128bytes of CMOS */
	RCBA32(0x3400) = (1 << 2);
}