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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <cpu/x86/mp.h>
#include <device/pci_ops.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <stdint.h>
#include "i440bx.h"
static void northbridge_init(struct device *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,
};
static const struct pci_driver northbridge_driver __pci_driver = {
.ops = &northbridge_operations,
.vendor = PCI_VID_INTEL,
.device = 0x7190,
};
static void i440bx_domain_read_resources(struct device *dev)
{
struct device *mc_dev;
uint32_t pci_tolm;
pci_domain_read_resources(dev);
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 %ld 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_range(dev, idx++, 0, 0xa0000);
ram_from_to(dev, idx++, 0xc0000, tolmk * KiB);
}
}
static struct device_operations pci_domain_ops = {
.read_resources = i440bx_domain_read_resources,
.set_resources = pci_domain_set_resources,
.scan_bus = pci_host_bridge_scan_bus,
};
static int get_cpu_count(void)
{
return CONFIG_MAX_CPUS;
}
static const struct mp_ops mp_ops = {
.get_cpu_count = get_cpu_count,
};
void mp_init_cpus(struct bus *cpu_bus)
{
/* TODO: Handle mp_init_with_smm failure? */
mp_init_with_smm(cpu_bus, &mp_ops);
}
static struct device_operations cpu_bus_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.init = mp_cpu_bus_init,
};
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_i440bx_ops = {
CHIP_NAME("Intel 82443BX (440BX) Northbridge")
.enable_dev = enable_dev,
};
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