src/soc/amd/genoa_poc/domain.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <amdblocks/ioapic.h>
#include <amdblocks/data_fabric.h>
#include <amdblocks/root_complex.h>
#include <amdblocks/smn.h>
#include <arch/ioapic.h>
#include <console/console.h>
#include <device/device.h>
#include <types.h>

#include <vendorcode/amd/opensil/genoa_poc/opensil.h>

#define IOHC_IOAPIC_BASE_ADDR_LO 0x2f0

static void genoa_domain_read_resources(struct device *domain)
{
	amd_pci_domain_read_resources(domain);

	// We only want to add the DRAM memory map once
	if (domain->downstream->secondary == 0 && domain->downstream->segment_group == 0) {
		/* 0x1000 is a large enough first index to be sure to not overlap with the
		   resources added by amd_pci_domain_read_resources */
		add_opensil_memmap(domain, 0x1000);
	}
}

static void genoa_domain_set_resources(struct device *domain)
{
	if (domain->downstream->bridge_ctrl & PCI_BRIDGE_CTL_VGA) {
		printk(BIOS_DEBUG, "Setting VGA decoding for domain 0x%x\n",
		       domain->path.domain.domain);
		const union df_vga_en vga_en = {
			.ve = 1,
			.dst_fabric_id = get_iohc_fabric_id(domain),
		};
		data_fabric_broadcast_write32(DF_VGA_EN, vga_en.raw);
	}

	pci_domain_set_resources(domain);

	/* Enable IOAPIC memory decoding */
	struct resource *res = probe_resource(domain, IOMMU_IOAPIC_IDX);
	if (res) {
		const uint32_t iohc_misc_base = get_iohc_misc_smn_base(domain);
		uint32_t ioapic_base = smn_read32(iohc_misc_base | IOHC_IOAPIC_BASE_ADDR_LO);
		ioapic_base |= (1 << 0);
		smn_write32(iohc_misc_base | IOHC_IOAPIC_BASE_ADDR_LO, ioapic_base);
	}
}

static void genoa_domain_init(struct device *domain)
{
	struct resource *res = probe_resource(domain, IOMMU_IOAPIC_IDX);
	if (!res)
		return;

	register_new_ioapic((void *)(uintptr_t)res->base);
}

static const char *genoa_domain_acpi_name(const struct device *domain)
{
	const char *domain_acpi_names[4] = {
		"S0B0",
		"S0B1",
		"S0B2",
		"S0B3",
	};

	if (domain->path.domain.domain < ARRAY_SIZE(domain_acpi_names))
		return domain_acpi_names[domain->path.domain.domain];

	return NULL;
}

struct device_operations genoa_pci_domain_ops = {
	.read_resources	= genoa_domain_read_resources,
	.set_resources	= genoa_domain_set_resources,
	.scan_bus	= amd_pci_domain_scan_bus,
	.init		= genoa_domain_init,
	.acpi_name	= genoa_domain_acpi_name,
	.acpi_fill_ssdt	= amd_pci_domain_fill_ssdt,
};