soc/amd/*/root_complex: introduce get_iohc_fabric_id

Implement get_iohc_fabric_id for each SoC that translates the coreboot
domain number to the fabric ID of the corresponding PCI root. This
allows the primary domain to have the number 0 even though the
destination data fabric ID will be non-zero. Keeping the primary domain
number 0 allows to use config_of_soc() which can be resolved at link
time and not need to dynamically find the SoC device to get the config.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I6538a777619eed974b449fc70d3fe3084ba447dd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77168
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/soc/amd/mendocino/root_complex.c b/src/soc/amd/mendocino/root_complex.c
index 0c95f7a86f..706cc2e75e 100644
--- a/src/soc/amd/mendocino/root_complex.c
+++ b/src/soc/amd/mendocino/root_complex.c
@@ -398,3 +398,13 @@ const struct non_pci_mmio_reg *get_iohc_non_pci_mmio_regs(size_t *count)
 	*count = ARRAY_SIZE(non_pci_mmio);
 	return non_pci_mmio;
 }
+
+signed int get_iohc_fabric_id(struct device *domain)
+{
+	switch (domain->path.domain.domain) {
+	case 0:
+		return IOMS0_FABRIC_ID;
+	default:
+		return -1;
+	}
+}