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/* SPDX-License-Identifier: GPL-2.0-only */
#include <cbmem.h>
#include <console/console.h>
#include <device/pci_def.h>
#include <device/pci_ops.h>
#include <stdint.h>
#include <device/device.h>
#include <boot/tables.h>
#include <acpi/acpi.h>
#include <northbridge/intel/x4x/memmap.h>
#include <northbridge/intel/x4x/chip.h>
#include <northbridge/intel/x4x/x4x.h>
#include <cpu/intel/smm_reloc.h>
#include <cpu/intel/speedstep.h>
#include <cpu/x86/smm.h>
static void mch_domain_read_resources(struct device *dev)
{
u8 index;
u64 tom, touud;
u32 tolud;
index = 3;
pci_domain_read_resources(dev);
struct device *mch = pcidev_on_root(0, 0);
/* Top of Upper Usable DRAM, including remap */
touud = pci_read_config16(mch, D0F0_TOUUD);
touud <<= 20;
/* Top of Lower Usable DRAM */
tolud = pci_read_config16(mch, D0F0_TOLUD) & 0xfff0;
tolud <<= 16;
/* Top of Memory - does not account for any UMA */
tom = pci_read_config16(mch, D0F0_TOM) & 0x01ff;
tom <<= 26;
printk(BIOS_DEBUG, "TOUUD 0x%llx TOLUD 0x%08x TOM 0x%llx\n", touud, tolud, tom);
/* Report the memory regions */
ram_from_to(dev, index++, 0, 0xa0000);
mmio_from_to(dev, index++, 0xa0000, 0xc0000);
reserved_ram_from_to(dev, index++, 0xc0000, 1 * MiB);
ram_from_to(dev, index++, 1 * MiB, (uintptr_t)cbmem_top());
/*
* If >= 4GB installed then memory from TOLUD to 4GB
* is remapped above TOM, TOUUD will account for both
*/
upper_ram_end(dev, index++, touud);
uintptr_t tseg_base;
size_t tseg_size;
smm_region(&tseg_base, &tseg_size);
mmio_from_to(dev, index++, tseg_base, tolud);
reserved_ram_from_to(dev, index++, (uintptr_t)cbmem_top(), tseg_base);
/* Reserve high memory where the NB BARs are up to 4GiB */
mmio_from_to(dev, index++, DEFAULT_HECIBAR, 4ull * GiB);
mmconf_resource(dev, index++);
}
static void mch_domain_set_resources(struct device *dev)
{
struct resource *res;
for (res = dev->resource_list; res; res = res->next)
report_resource_stored(dev, res, "");
assign_resources(dev->downstream);
}
static void mch_domain_init(struct device *dev)
{
/* Enable SERR */
pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_SERR);
}
static const char *northbridge_acpi_name(const struct device *dev)
{
if (dev->path.type == DEVICE_PATH_DOMAIN)
return "PCI0";
if (!is_pci_dev_on_bus(dev, 0))
return NULL;
switch (dev->path.pci.devfn) {
case PCI_DEVFN(0, 0):
return "MCHC";
}
return NULL;
}
void northbridge_write_smram(u8 smram)
{
struct device *dev = pcidev_on_root(0, 0);
if (!dev)
die("could not find pci 00:00.0!\n");
pci_write_config8(dev, D0F0_SMRAM, smram);
}
struct device_operations x4x_pci_domain_ops = {
.read_resources = mch_domain_read_resources,
.set_resources = mch_domain_set_resources,
.init = mch_domain_init,
.scan_bus = pci_host_bridge_scan_bus,
.write_acpi_tables = northbridge_write_acpi_tables,
.acpi_fill_ssdt = generate_cpu_entries,
.acpi_name = northbridge_acpi_name,
};
struct device_operations x4x_cpu_bus_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.init = mp_cpu_bus_init,
};
static void hide_pci_fn(const int dev_bit_base, const struct device *dev)
{
if (!dev || dev->enabled)
return;
const unsigned int fn = PCI_FUNC(dev->path.pci.devfn);
const struct device *const d0f0 = pcidev_on_root(0, 0);
pci_update_config32(d0f0, D0F0_DEVEN, ~(1 << (dev_bit_base + fn)), 0);
}
static void hide_pci_dev(const int dev, int functions, const int dev_bit_base)
{
for (; functions >= 0; functions--)
hide_pci_fn(dev_bit_base, pcidev_on_root(dev, functions));
}
static void x4x_init(void *const chip_info)
{
struct device *const d0f0 = pcidev_on_root(0x0, 0);
/* Hide internal functions based on devicetree info. */
hide_pci_dev(6, 0, 13); /* PEG1: only on P45 */
hide_pci_dev(3, 3, 6); /* ME */
hide_pci_dev(2, 1, 3); /* IGD */
hide_pci_dev(1, 0, 1); /* PEG0 */
const u32 deven = pci_read_config32(d0f0, D0F0_DEVEN);
if (!(deven & (0xf << 6)))
pci_write_config32(d0f0, D0F0_DEVEN, deven & ~(1 << 14));
}
struct chip_operations northbridge_intel_x4x_ops = {
.name = "Intel 4-Series Northbridge",
.init = x4x_init,
};
bool northbridge_support_slfm(void)
{
return false;
}
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