soc/intel/xeon_sp: Unshare Xeon-SP chip common codes

GraniteRapids (6th Gen Xeon-SP) FSP contains changes in IIO stack
descriptors impacting the way of coreboot's creation of domains.
Separates the codes as preparation for 6th Gen and later platforms.

Change-Id: Iab6acaa5e5c090c8d821bd7c2d3e0e0ad7486bdc
Signed-off-by: Shuo Liu <shuo.liu@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81312
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

1 files changed, 201 insertions, 0 deletions

diff --git a/src/soc/intel/xeon_sp/chip_gen1.c b/src/soc/intel/xeon_sp/chip_gen1.c
new file mode 100644
index 0000000000..80ffdda943
--- /dev/null
+++ b/src/soc/intel/xeon_sp/chip_gen1.c
@@ -0,0 +1,201 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpigen_pci.h>
+#include <assert.h>
+#include <console/console.h>
+#include <device/pci.h>
+#include <intelblocks/acpi.h>
+#include <post.h>
+#include <soc/acpi.h>
+#include <soc/chip_common.h>
+#include <soc/soc_util.h>
+#include <soc/util.h>
+#include <stdlib.h>
+
+static const STACK_RES *domain_to_stack_res(const struct device *dev)
+{
+	assert(dev->path.type == DEVICE_PATH_DOMAIN);
+	const union xeon_domain_path dn = {
+		.domain_path = dev->path.domain.domain
+	};
+
+	const IIO_UDS *hob = get_iio_uds();
+	assert(hob != NULL);
+
+	return &hob->PlatformData.IIO_resource[dn.socket].StackRes[dn.stack];
+}
+
+static void iio_pci_domain_read_resources(struct device *dev)
+{
+	struct resource *res;
+	const STACK_RES *sr = domain_to_stack_res(dev);
+
+	if (!sr)
+		return;
+
+	int index = 0;
+
+	if (is_domain0(dev)) {
+		/* The 0 - 0xfff IO range is not reported by the HOB but still gets decoded */
+		res = new_resource(dev, index++);
+		res->base = 0;
+		res->size = 0x1000;
+		res->limit = 0xfff;
+		res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
+	}
+
+	if (sr->PciResourceIoBase < sr->PciResourceIoLimit) {
+		res = new_resource(dev, index++);
+		res->base = sr->PciResourceIoBase;
+		res->limit = sr->PciResourceIoLimit;
+		res->size = res->limit - res->base + 1;
+		res->flags = IORESOURCE_IO | IORESOURCE_ASSIGNED;
+	}
+
+	if (sr->PciResourceMem32Base < sr->PciResourceMem32Limit) {
+		res = new_resource(dev, index++);
+		res->base = sr->PciResourceMem32Base;
+		res->limit = sr->PciResourceMem32Limit;
+		res->size = res->limit - res->base + 1;
+		res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED;
+	}
+
+	if (sr->PciResourceMem64Base < sr->PciResourceMem64Limit) {
+		res = new_resource(dev, index++);
+		res->base = sr->PciResourceMem64Base;
+		res->limit = sr->PciResourceMem64Limit;
+		res->size = res->limit - res->base + 1;
+		res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED;
+	}
+}
+
+/*
+ * Used by IIO stacks for PCIe bridges. Those contain 1 PCI host bridges,
+ *  all the bus numbers on the IIO stack can be used for this bridge
+ */
+static struct device_operations iio_pcie_domain_ops = {
+	.read_resources = iio_pci_domain_read_resources,
+	.set_resources = pci_domain_set_resources,
+	.scan_bus = pci_host_bridge_scan_bus,
+#if CONFIG(HAVE_ACPI_TABLES)
+	.acpi_name        = soc_acpi_name,
+	.write_acpi_tables = northbridge_write_acpi_tables,
+	.acpi_fill_ssdt	   = pci_domain_fill_ssdt,
+#endif
+};
+
+/*
+ * Used by UBOX stacks. Those contain multiple PCI host bridges, each having
+ * only one bus with UBOX devices. UBOX devices have no resources.
+ */
+static struct device_operations ubox_pcie_domain_ops = {
+	.read_resources = noop_read_resources,
+	.set_resources = noop_set_resources,
+	.scan_bus = pci_host_bridge_scan_bus,
+#if CONFIG(HAVE_ACPI_TABLES)
+	.acpi_name        = soc_acpi_name,
+	.write_acpi_tables = northbridge_write_acpi_tables,
+	.acpi_fill_ssdt	   = pci_domain_fill_ssdt,
+#endif
+};
+
+static void create_pcie_domains(const union xeon_domain_path dp, struct bus *upstream,
+				    const STACK_RES *sr, const size_t pci_segment_group)
+{
+	create_domain(dp, upstream, sr->BusBase, sr->BusLimit, DOMAIN_TYPE_PCIE,
+			   &iio_pcie_domain_ops, pci_segment_group);
+}
+
+/*
+ * On the first Xeon-SP generations there are no separate UBOX stacks,
+ * and the UBOX devices reside on the first and second IIO. Starting
+ * with 3rd gen Xeon-SP the UBOX devices are located on their own IIO.
+ */
+static void create_ubox_domains(const union xeon_domain_path dp, struct bus *upstream,
+				    const STACK_RES *sr, const size_t pci_segment_group)
+{
+	/* Only expect 2 UBOX buses here */
+	assert(sr->BusBase + 1 == sr->BusLimit);
+
+	create_domain(dp, upstream, sr->BusBase, sr->BusBase, DOMAIN_TYPE_UBX0,
+			   &ubox_pcie_domain_ops, pci_segment_group);
+	create_domain(dp, upstream, sr->BusLimit, sr->BusLimit, DOMAIN_TYPE_UBX1,
+			   &ubox_pcie_domain_ops, pci_segment_group);
+}
+
+void create_cxl_domains(const union xeon_domain_path dp, struct bus *bus,
+			const STACK_RES *sr, const size_t pci_segment_group);
+
+#if CONFIG(SOC_INTEL_HAS_CXL)
+static void iio_cxl_domain_read_resources(struct device *dev)
+{
+	struct resource *res;
+	const STACK_RES *sr = domain_to_stack_res(dev);
+
+	if (!sr)
+		return;
+
+	int index = 0;
+
+	if (sr->IoBase < sr->PciResourceIoBase) {
+		res = new_resource(dev, index++);
+		res->base = sr->IoBase;
+		res->limit = sr->PciResourceIoBase - 1;
+		res->size = res->limit - res->base + 1;
+		res->flags = IORESOURCE_IO | IORESOURCE_ASSIGNED;
+	}
+
+	if (sr->Mmio32Base < sr->PciResourceMem32Base) {
+		res = new_resource(dev, index++);
+		res->base = sr->Mmio32Base;
+		res->limit = sr->PciResourceMem32Base - 1;
+		res->size = res->limit - res->base + 1;
+		res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED;
+	}
+
+	if (sr->Mmio64Base < sr->PciResourceMem64Base) {
+		res = new_resource(dev, index++);
+		res->base = sr->Mmio64Base;
+		res->limit = sr->PciResourceMem64Base - 1;
+		res->size = res->limit - res->base + 1;
+		res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED;
+	}
+}
+
+static struct device_operations iio_cxl_domain_ops = {
+	.read_resources = iio_cxl_domain_read_resources,
+	.set_resources = pci_domain_set_resources,
+	.scan_bus = pci_host_bridge_scan_bus,
+#if CONFIG(HAVE_ACPI_TABLES)
+	.acpi_name        = soc_acpi_name,
+	.write_acpi_tables = northbridge_write_acpi_tables,
+	.acpi_fill_ssdt	   = pci_domain_fill_ssdt,
+#endif
+};
+
+void create_cxl_domains(const union xeon_domain_path dp, struct bus *bus,
+			    const STACK_RES *sr, const size_t pci_segment_group)
+{
+	assert(sr->BusBase + 1 <= sr->BusLimit);
+
+	/* 1st domain contains PCIe RCiEPs */
+	create_domain(dp, bus, sr->BusBase, sr->BusBase, DOMAIN_TYPE_PCIE,
+			   &iio_pcie_domain_ops, pci_segment_group);
+	/* 2nd domain contains CXL 1.1 end-points */
+	create_domain(dp, bus, sr->BusBase + 1, sr->BusLimit, DOMAIN_TYPE_CXL,
+			   &iio_cxl_domain_ops, pci_segment_group);
+}
+#endif //CONFIG(SOC_INTEL_HAS_CXL)
+
+void create_xeonsp_domains(const union xeon_domain_path dp, struct bus *bus,
+				const STACK_RES *sr, const size_t pci_segment_group)
+{
+	if (is_ubox_stack_res(sr))
+		create_ubox_domains(dp, bus, sr, pci_segment_group);
+	else if (CONFIG(SOC_INTEL_HAS_CXL) && is_iio_cxl_stack_res(sr))
+		create_cxl_domains(dp, bus, sr, pci_segment_group);
+	else if (is_pcie_iio_stack_res(sr))
+		create_pcie_domains(dp, bus, sr, pci_segment_group);
+	else if (CONFIG(HAVE_IOAT_DOMAINS) && is_ioat_iio_stack_res(sr))
+		create_ioat_domains(dp, bus, sr, pci_segment_group);
+}