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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2003 Ronald G. Minnich
* Copyright (C) 2003-2004 Eric W. Biederman
* Copyright (C) 2006 Jon Dufresne <jon.dufresne@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.
*/
#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/x86/cache.h>
#include <cpu/cpu.h>
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 = 0x3580,
};
static void pci_domain_set_resources(device_t dev)
{
device_t mc_dev;
uint32_t pci_tolm;
printk(BIOS_DEBUG, "Entered with dev vid = %x\n", dev->vendor);
printk(BIOS_DEBUG, "Entered with dev did = %x\n", dev->device);
pci_tolm = find_pci_tolm(dev->link_list);
mc_dev = dev->link_list->children->sibling;
printk(BIOS_DEBUG, "MC dev vendor = %x\n", mc_dev->vendor);
printk(BIOS_DEBUG, "MC dev device = %x\n", mc_dev->device);
if (mc_dev) {
/* Figure out which areas are/should be occupied by RAM.
* This is all computed in kilobytes and converted to/from
* the memory controller right at the edges.
* Having different variables in different units is
* too confusing to get right. Kilobytes are good up to
* 4 Terabytes of RAM...
*/
unsigned long tomk, tolmk;
int idx;
/* Get the value of the highest DRB. This tells the end of
* the physical memory. The units are ticks of 32MB
* i.e. 1 means 32MB.
*/
tomk = (unsigned long)pci_read_config8(mc_dev, 0x43);
tomk = tomk * 32 * 1024;
/* add vga_mem detection */
tomk = tomk - 16 * 1024;
/* Compute the top of Low memory */
tolmk = pci_tolm >> 10;
if (tolmk >= tomk) {
/* The PCI hole does not overlap memory
*/
tolmk = tomk;
}
/* Write the RAM configuration registers,
* preserving the reserved bits.
*/
/* Report the memory regions */
printk(BIOS_DEBUG, "tomk = %ld\n", tomk);
printk(BIOS_DEBUG, "tolmk = %ld\n", tolmk);
idx = 10;
/* avoid pam region */
ram_resource(dev, idx++, 0, 640);
/* ram_resource(dev, idx++, 1024, tolmk - 1024); */
ram_resource(dev, idx++, 768, tolmk - 768);
set_late_cbmem_top(tomk * 1024);
}
assign_resources(dev->link_list);
}
static struct device_operations pci_domain_ops = {
.read_resources = pci_domain_read_resources,
.set_resources = pci_domain_set_resources,
.enable_resources = NULL,
.init = NULL,
.scan_bus = pci_domain_scan_bus,
.ops_pci_bus = pci_bus_default_ops,
};
static void cpu_bus_init(device_t dev)
{
initialize_cpus(dev->link_list);
}
static struct device_operations cpu_bus_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_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;
}
else if (dev->path.type == DEVICE_PATH_CPU_CLUSTER) {
dev->ops = &cpu_bus_ops;
}
}
struct chip_operations northbridge_intel_i855_ops = {
CHIP_NAME("Intel 855 Northbridge")
.enable_dev = enable_dev,
};
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