soc/intel/xeon_sp: Create SSDT for Gen6 LPC controller

In coreboot, LPC ACPI objects with its attached devices are
usually provided by static DSDT. For Xeon-SP Gen6 LPC, its logical
attached devices are created from dynamic SSDT (e.g. super IO).
Create a simple SSDT for LPC in dynamic way as well to complete
the device relationship chain.

Fix below issues during Linux OS boot. The issue will block
Windows OS boot as well.

[   22.986142] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.DI00.LPCB], AE_NOT_FOUND (20230628/dswload2-162)
[   22.986792] ACPI Error: AE_NOT_FOUND, During name lookup/catalog (20230628/psobject-220)
[   22.987786] ACPI: Skipping parse of AML opcode: Scope (0x0010)

Change-Id: I08543fc77f0f3e633b05889e921c5183e6e20d8e
Signed-off-by: Lu, Pen-ChunX <pen-chunx.lu@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84842
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/soc/intel/xeon_sp/lpc_gen6.c b/src/soc/intel/xeon_sp/lpc_gen6.c
index d2aaec1888..d4045a877d 100644
--- a/src/soc/intel/xeon_sp/lpc_gen6.c
+++ b/src/soc/intel/xeon_sp/lpc_gen6.c
@@ -6,6 +6,30 @@
 #include <intelblocks/pcr.h>
 #include <soc/pcr_ids.h>
 
+#include <acpi/acpigen.h>
+#include <acpi/acpigen_pci.h>
+
+void lpc_soc_fill_ssdt(const struct device *dev)
+{
+	const char *scope = acpi_device_scope(dev);
+	const char *name = acpi_device_name(dev);
+
+	if (!scope || !name) {
+		printk(BIOS_ERR, "%s: Missing ACPI path/scope\n", dev_path(dev));
+		return;
+	}
+
+	/* Device */
+	acpigen_write_scope(scope);
+	acpigen_write_device(name);
+
+	printk(BIOS_DEBUG, "%s.%s: %s\n", scope, name, dev_path(dev));
+	acpigen_write_ADR_pci_device(dev);
+
+	acpigen_write_device_end(); /* Device */
+	acpigen_write_scope_end(); /* Scope */
+}
+
 void lpc_soc_init(struct device *dev)
 {
 	printk(BIOS_SPEW, "pch: lpc_init\n");