src/southbridge/intel/i82801ix/pci.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2008-2009 coresystems GmbH
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include "i82801ix.h"

static void pci_init(struct device *dev)
{
	u16 reg16;
	u8 reg8;

	/* This device has no interrupt */
	pci_write_config8(dev, PCI_INTERRUPT_LINE, 0xff);

	/* Master Latency Count must be set to 0x04! */
	reg8 = pci_read_config8(dev, D30F0_SMLT);
	reg8 &= 0x07;
	reg8 |= (0x04 << 3);
	pci_write_config8(dev, D30F0_SMLT, reg8);

	/* Clear errors in status registers */
	reg16 = pci_read_config16(dev, PCI_STATUS);
	//reg16 |= 0xf900;
	pci_write_config16(dev, PCI_STATUS, reg16);

	reg16 = pci_read_config16(dev, PCI_SEC_STATUS);
	// reg16 |= 0xf900;
	pci_write_config16(dev, PCI_SEC_STATUS, reg16);
}

static void set_subsystem(device_t dev, unsigned vendor, unsigned device)
{
	/* NOTE: 0x54 is not the default position! */
	if (!vendor || !device) {
		pci_write_config32(dev, 0x54,
				pci_read_config32(dev, PCI_VENDOR_ID));
	} else {
		pci_write_config32(dev, 0x54,
				((device & 0xffff) << 16) | (vendor & 0xffff));
	}
}

static struct pci_operations pci_ops = {
	.set_subsystem = set_subsystem,
};

static struct device_operations device_ops = {
	.read_resources		= pci_bus_read_resources,
	.set_resources		= pci_dev_set_resources,
	.enable_resources	= pci_bus_enable_resources,
	.init			= pci_init,
	.scan_bus		= pci_scan_bridge,
	.reset_bus		= pci_bus_reset,
	.ops_pci		= &pci_ops,
};

static const unsigned short pci_device_ids[] = {
	0x244e, /* Desktop */
	0x2448, /* Mobile */
	0
};

static const struct pci_driver ich9_pci __pci_driver = {
	.ops		= &device_ops,
	.vendor		= PCI_VENDOR_ID_INTEL,
	.devices	= pci_device_ids,
};