3 files changed, 50 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/include/amdblocks/root_complex.h b/src/soc/amd/common/block/include/amdblocks/root_complex.h
index 9ef5d05925..bfabf973a7 100644
--- a/src/soc/amd/common/block/include/amdblocks/root_complex.h
+++ b/src/soc/amd/common/block/include/amdblocks/root_complex.h
@@ -15,6 +15,11 @@
 
 #define NON_PCI_RES_IDX_AUTO	0
 
+struct domain_iohc_info {
+	uint16_t fabric_id;
+	uint32_t misc_smn_base;
+};
+
 struct non_pci_mmio_reg {
 	uint32_t iohc_misc_offset;
 	uint64_t mask;
@@ -27,6 +32,7 @@ void read_non_pci_resources(struct device *domain, unsigned long *idx);
 void read_soc_memmap_resources(struct device *domain, unsigned long *idx);
 
 uint32_t get_iohc_misc_smn_base(struct device *domain);
+const struct domain_iohc_info *get_iohc_info(size_t *count);
 const struct non_pci_mmio_reg *get_iohc_non_pci_mmio_regs(size_t *count);
 
 signed int get_iohc_fabric_id(struct device *domain);
diff --git a/src/soc/amd/common/block/root_complex/Makefile.mk b/src/soc/amd/common/block/root_complex/Makefile.mk
index 07f3ab108e..a6aa0da502 100644
--- a/src/soc/amd/common/block/root_complex/Makefile.mk
+++ b/src/soc/amd/common/block/root_complex/Makefile.mk
@@ -3,5 +3,6 @@ ifeq ($(CONFIG_SOC_AMD_COMMON_BLOCK_ROOT_COMPLEX),y)
 
 ramstage-y += ioapic.c
 ramstage-y += non_pci_resources.c
+ramstage-y += root_complex.c
 
 endif # CONFIG_SOC_AMD_COMMON_BLOCK_ROOT_COMPLEX
diff --git a/src/soc/amd/common/block/root_complex/root_complex.c b/src/soc/amd/common/block/root_complex/root_complex.c
new file mode 100644
index 0000000000..2bcdc1d432
--- /dev/null
+++ b/src/soc/amd/common/block/root_complex/root_complex.c
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <amdblocks/root_complex.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <types.h>
+
+static const struct domain_iohc_info *get_domain_iohc_info(struct device *domain)
+{
+	const unsigned int domain_id = domain->path.domain.domain;
+	const struct domain_iohc_info *iohc;
+	size_t iohc_count;
+
+	iohc = get_iohc_info(&iohc_count);
+
+	if (domain_id < iohc_count) {
+		return &iohc[domain_id];
+	} else {
+		printk(BIOS_ERR, "Invalid domain 0x%x with no corresponding IOHC device.\n",
+		       domain_id);
+		return NULL;
+	}
+}
+
+uint32_t get_iohc_misc_smn_base(struct device *domain)
+{
+	const struct domain_iohc_info *iohc_info = get_domain_iohc_info(domain);
+
+	if (iohc_info)
+		return iohc_info->misc_smn_base;
+	else
+		return 0;
+}
+
+signed int get_iohc_fabric_id(struct device *domain)
+{
+	const struct domain_iohc_info *iohc_info = get_domain_iohc_info(domain);
+
+	if (iohc_info)
+		return iohc_info->fabric_id;
+	else
+		return -1;
+}