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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#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/iomap.h>
#include <northbridge/intel/x4x/chip.h>
#include <northbridge/intel/x4x/x4x.h>
#include <cpu/intel/smm_reloc.h>
static const int legacy_hole_base_k = 0xa0000 / 1024;
static void mch_domain_read_resources(struct device *dev)
{
u8 index;
u64 tom, touud;
u32 tomk, tolud, delta_cbmem;
u32 pcie_config_base, pcie_config_size;
u32 uma_sizek = 0;
const u32 top32memk = 4 * (GiB / KiB);
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);
tomk = tolud >> 10;
/* Graphics memory comes next */
const u16 ggc = pci_read_config16(mch, D0F0_GGC);
printk(BIOS_DEBUG, "IGD decoded, subtracting ");
/* Graphics memory */
const u32 gms_sizek = decode_igd_memory_size((ggc >> 4) & 0xf);
printk(BIOS_DEBUG, "%uM UMA", gms_sizek >> 10);
tomk -= gms_sizek;
uma_sizek += gms_sizek;
/* GTT Graphics Stolen Memory Size (GGMS) */
const u32 gsm_sizek = decode_igd_gtt_size((ggc >> 8) & 0xf);
printk(BIOS_DEBUG, " and %uM GTT\n", gsm_sizek >> 10);
tomk -= gsm_sizek;
uma_sizek += gsm_sizek;
printk(BIOS_DEBUG, "TSEG decoded, subtracting ");
const u32 tseg_sizek = decode_tseg_size(
pci_read_config8(dev, D0F0_ESMRAMC)) >> 10;
uma_sizek += tseg_sizek;
tomk -= tseg_sizek;
printk(BIOS_DEBUG, "%dM\n", tseg_sizek >> 10);
/* cbmem_top can be shifted downwards due to alignment.
Mark the region between cbmem_top and tomk as unusable */
delta_cbmem = tomk - ((uint32_t)cbmem_top() >> 10);
tomk -= delta_cbmem;
uma_sizek += delta_cbmem;
printk(BIOS_DEBUG, "Unused RAM between cbmem_top and TOM: 0x%xK\n",
delta_cbmem);
printk(BIOS_INFO, "Available memory below 4GB: %uM\n", tomk >> 10);
/* Report the memory regions */
ram_resource(dev, index++, 0, legacy_hole_base_k);
mmio_resource(dev, index++, legacy_hole_base_k,
(0xc0000 >> 10) - legacy_hole_base_k);
reserved_ram_resource(dev, index++, 0xc0000 >> 10,
(0x100000 - 0xc0000) >> 10);
ram_resource(dev, index++, 0x100000 >> 10, (tomk - (0x100000 >> 10)));
/*
* If >= 4GB installed then memory from TOLUD to 4GB
* is remapped above TOM, TOUUD will account for both
*/
touud >>= 10; /* Convert to KB */
if (touud > top32memk) {
ram_resource(dev, index++, top32memk, touud - top32memk);
printk(BIOS_INFO, "Available memory above 4GB: %lluM\n",
(touud - top32memk) >> 10);
}
printk(BIOS_DEBUG, "Adding UMA memory area base=0x%08x "
"size=0x%08x\n", tomk << 10, uma_sizek << 10);
uma_resource(dev, index++, tomk, uma_sizek);
/* Reserve high memory where the NB BARs are up to 4GiB */
fixed_mem_resource(dev, index++, DEFAULT_HECIBAR >> 10,
top32memk - (DEFAULT_HECIBAR >> 10),
IORESOURCE_RESERVE);
if (decode_pciebar(&pcie_config_base, &pcie_config_size)) {
printk(BIOS_DEBUG, "Adding PCIe config bar base=0x%08x "
"size=0x%x\n", pcie_config_base, pcie_config_size);
fixed_mem_resource(dev, index++, pcie_config_base >> 10,
pcie_config_size >> 10, IORESOURCE_RESERVE);
}
}
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->link_list);
}
static void mch_domain_init(struct device *dev)
{
u32 reg32;
/* Enable SERR */
reg32 = pci_read_config32(dev, PCI_COMMAND);
reg32 |= PCI_COMMAND_SERR;
pci_write_config32(dev, PCI_COMMAND, reg32);
}
static const char *northbridge_acpi_name(const struct device *dev)
{
if (dev->path.type == DEVICE_PATH_DOMAIN)
return "PCI0";
if (dev->path.type != DEVICE_PATH_PCI || dev->bus->secondary != 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 == NULL)
die("could not find pci 00:00.0!\n");
pci_write_config8(dev, D0F0_SMRAM, smram);
}
static struct device_operations pci_domain_ops = {
.read_resources = mch_domain_read_resources,
.set_resources = mch_domain_set_resources,
.init = mch_domain_init,
.scan_bus = pci_domain_scan_bus,
.write_acpi_tables = northbridge_write_acpi_tables,
.acpi_fill_ssdt = generate_cpu_entries,
.acpi_name = northbridge_acpi_name,
};
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;
}
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 = {
CHIP_NAME("Intel 4-Series Northbridge")
.enable_dev = enable_dev,
.init = x4x_init,
};
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