src/northbridge/intel/i440lx/northbridge.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2009 Maciej Pijanka <maciej.pijanka@gmail.com>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 <console/console.h>
#include <arch/io.h>
#include <stdint.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <stdlib.h>
#include <string.h>
#include <cbmem.h>
#include <cpu/cpu.h>
#include <pc80/keyboard.h>
#include "northbridge.h"
#include "i440lx.h"

/* This code is mostly same as 440BX created by Uwe Hermann,
 * i done only very minor changes like renamed functions to 440lx etc
 * Maciej
 */

static void northbridge_init(device_t dev)
{
	printk(BIOS_SPEW, "Northbridge Init\n");
}

static struct device_operations northbridge_operations = {
	.read_resources   = pci_dev_read_resources,
	.set_resources    = pci_dev_set_resources,
	.enable_resources = pci_dev_enable_resources,
	.init             = northbridge_init,
	.enable           = 0,
	.ops_pci          = 0,
};

static const struct pci_driver northbridge_driver __pci_driver = {
	.ops = &northbridge_operations,
	.vendor = PCI_VENDOR_ID_INTEL,
	.device = 0x7180,
};

static void i440lx_domain_set_resources(device_t dev)
{
	device_t mc_dev;
	uint32_t pci_tolm;

	pci_tolm = find_pci_tolm(dev->link_list);
	mc_dev = dev->link_list->children;
	if (mc_dev) {
		unsigned long tomk, tolmk;
		int idx;

		/* Figure out which areas are/should be occupied by RAM. The
		 * value of the highest DRB denotes the end of the physical
		 * memory (in units of 8MB).
		 */
		tomk = ((unsigned long)pci_read_config8(mc_dev, DRB7));

		/* Convert to KB. */
		tomk *= (8 * 1024);

		printk(BIOS_DEBUG, "Setting RAM size to %lu MB\n", tomk / 1024);

		/* Compute the top of low memory. */
		tolmk = pci_tolm / 1024;

		if (tolmk >= tomk) {
			/* The PCI hole does not overlap the memory. */
			tolmk = tomk;
		}

		/* Report the memory regions. */
		idx = 10;
		ram_resource(dev, idx++, 0, 640);
		ram_resource(dev, idx++, 768, tolmk - 768);

		/* Leave some space for ACPI, PIRQ and MP tables */
		high_tables_base = (tomk * 1024) - HIGH_MEMORY_SIZE;
		high_tables_size = HIGH_MEMORY_SIZE;
	}
	assign_resources(dev->link_list);
}

static struct device_operations pci_domain_ops = {
	.read_resources		= pci_domain_read_resources,
	.set_resources		= i440lx_domain_set_resources,
	.enable_resources	= NULL,
	.init			= NULL,
	.scan_bus		= pci_domain_scan_bus,
};

static void cpu_bus_init(device_t dev)
{
	initialize_cpus(dev->link_list);
}

static void cpu_bus_noop(device_t dev)
{
}

static struct device_operations cpu_bus_ops = {
	.read_resources   = cpu_bus_noop,
	.set_resources    = cpu_bus_noop,
	.enable_resources = cpu_bus_noop,
	.init             = cpu_bus_init,
	.scan_bus         = 0,
};

static void enable_dev(struct device *dev)
{
	/* Set the operations if it is a special bus type */
	if (dev->path.type == DEVICE_PATH_DOMAIN) {
		dev->ops = &pci_domain_ops;
		pci_set_method(dev);
	}
	else if (dev->path.type == DEVICE_PATH_CPU_CLUSTER) {
		dev->ops = &cpu_bus_ops;
	}
}

struct chip_operations northbridge_intel_i440lx_ops = {
	CHIP_NAME("Intel 82443LX (440LX) Northbridge")
	.enable_dev = enable_dev,
};