From d6331e0884ceb6a17f7fd446b287b7cb5e50fcc1 Mon Sep 17 00:00:00 2001
From: Duncan Laurie <dlaurie@google.com>
Date: Fri, 28 Aug 2020 18:09:56 +0000
Subject: soc/intel/common/block: Add common support for USB4/Thunderbolt

This common intel driver will add the requried ACPI _DSD entries for
enabled USB4/Thunderbolt ports' DMA devices the SSDT instead of using
hardcoded values in the DSDT.

Change-Id: Ic4a58202d4569cf092ea21a4a83a3af6c42ce9d0
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44916
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
---
 src/soc/intel/common/block/usb4/usb4.c | 51 ++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

(limited to 'src')

diff --git a/src/soc/intel/common/block/usb4/usb4.c b/src/soc/intel/common/block/usb4/usb4.c
index a0afc20f5b..7c545f6043 100644
--- a/src/soc/intel/common/block/usb4/usb4.c
+++ b/src/soc/intel/common/block/usb4/usb4.c
@@ -1,8 +1,55 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
+#include <acpi/acpigen.h>
+#include <acpi/acpi_device.h>
 #include <device/device.h>
 #include <device/pci.h>
+#include <device/pci_def.h>
 #include <device/pci_ids.h>
+#include <soc/pci_devs.h>
+
+#define INTEL_TBT_IMR_VALID_UUID	"C44D002F-69F9-4E7D-A904-A7BAABDF43F7"
+#define INTEL_TBT_WAKE_SUPPORTED_UUID	"6C501103-C189-4296-BA72-9BF5A26EBE5D"
+
+#if CONFIG(HAVE_ACPI_TABLES)
+static const char *tbt_dma_acpi_name(const struct device *dev)
+{
+	switch (dev->path.pci.devfn) {
+	case SA_DEV_TCSS_DMA0:
+		return "TDM0";
+	case SA_DEV_TCSS_DMA1:
+		return "TDM1";
+	default:
+		return NULL;
+	}
+}
+
+static void tbt_dma_fill_ssdt(const struct device *dev)
+{
+	struct acpi_dp *dsd, *pkg;
+
+	if (!dev->enabled)
+		return;
+
+	acpigen_write_scope(acpi_device_path(dev));
+
+	dsd = acpi_dp_new_table("_DSD");
+
+	/* Indicate that device has valid IMR. */
+	pkg = acpi_dp_new_table(INTEL_TBT_IMR_VALID_UUID);
+	acpi_dp_add_integer(pkg, "IMR_VALID", 1);
+	acpi_dp_add_package(dsd, pkg);
+
+	/* Indicate that device is wake capable. */
+	pkg = acpi_dp_new_table(INTEL_TBT_WAKE_SUPPORTED_UUID);
+	acpi_dp_add_integer(pkg, "WAKE_SUPPORTED", 1);
+
+	acpi_dp_add_package(dsd, pkg);
+	acpi_dp_write(dsd);
+
+	acpigen_pop_len(); /* Scope */
+}
+#endif
 
 static const unsigned short pci_device_ids[] = {
 	PCI_DEVICE_ID_INTEL_TGL_TBT_DMA0,
@@ -16,6 +63,10 @@ static struct device_operations usb4_dev_ops = {
 	.enable_resources	= pci_dev_enable_resources,
 	.scan_bus		= scan_generic_bus,
 	.ops_pci		= &pci_dev_ops_pci,
+#if CONFIG(HAVE_ACPI_TABLES)
+	.acpi_name		= tbt_dma_acpi_name,
+	.acpi_fill_ssdt		= tbt_dma_fill_ssdt,
+#endif
 };
 
 static const struct pci_driver usb4_driver __pci_driver = {
-- 
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