[edk2-devel] [PATCH edk2-platforms v6 4/4] SbsaQemu: disable XHCI in DSDT if not present

["Marcin Juszkiewicz" <marcin.juszkiewicz@linaro.org>]

We need platform version to be at least 0.3 to have XHCI
in virtual hardware. On older platforms there is non-working
EHCI which we ignore.

Set DSDT node to be disabled so operating system will not try
to initialize not-existing hardware.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
---
 .../Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf      |  4 ++
 .../Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c        | 74 +++++++++++++++++++-
 Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl            |  3 +-
 3 files changed, 79 insertions(+), 2 deletions(-)

diff --git a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf
index 7c7e08e0fd3a..291743b19115 100644
--- a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf
+++ b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf
@@ -29,6 +29,7 @@ [Packages]
   Silicon/Qemu/SbsaQemu/SbsaQemu.dec
 
 [LibraryClasses]
+  AcpiLib
   ArmLib
   BaseMemoryLib
   BaseLib
@@ -49,6 +50,8 @@ [Pcd]
   gArmTokenSpaceGuid.PcdGicDistributorBase
   gArmTokenSpaceGuid.PcdGicRedistributorsBase
   gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdGicItsBase
+  gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdPlatformVersionMajor
+  gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdPlatformVersionMinor
   gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdSmmuBase
 
 [Depex]
@@ -58,6 +61,7 @@ [Guids]
   gEdkiiPlatformHasAcpiGuid
 
 [Protocols]
+  gEfiAcpiSdtProtocolGuid
   gEfiAcpiTableProtocolGuid                       ## CONSUMES
 
 [FixedPcd]
diff --git a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
index fd849ca1594b..523d9035e0c1 100644
--- a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
+++ b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
@@ -10,6 +10,7 @@
 #include <IndustryStandard/AcpiAml.h>
 #include <IndustryStandard/IoRemappingTable.h>
 #include <IndustryStandard/SbsaQemuAcpi.h>
+#include <IndustryStandard/SbsaQemuPlatformVersion.h>
 #include <Library/AcpiLib.h>
 #include <Library/ArmLib.h>
 #include <Library/BaseMemoryLib.h>
@@ -682,6 +683,72 @@ AddGtdtTable (
   return Status;
 }
 
+/*
+ * A function to disable XHCI node on Platform Version lower than 0.3
+ */
+STATIC
+EFI_STATUS
+DisableXhciOnOlderPlatVer (
+  VOID
+  )
+{
+  EFI_STATUS                   Status;
+  EFI_ACPI_SDT_PROTOCOL        *AcpiSdtProtocol;
+  EFI_ACPI_DESCRIPTION_HEADER  *Table;
+  UINTN                        TableKey;
+  UINTN                        TableIndex;
+  EFI_ACPI_HANDLE              TableHandle;
+
+  Status = EFI_SUCCESS;
+
+  if ( PLATFORM_VERSION_LESS_THAN (0, 3)) {
+    DEBUG ((DEBUG_ERROR, "Platform Version < 0.3 - disabling XHCI\n"));
+    Status = gBS->LocateProtocol (
+                                  &gEfiAcpiSdtProtocolGuid,
+                                  NULL,
+                                  (VOID **)&AcpiSdtProtocol
+                                  );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "Unable to locate ACPI table protocol\n"));
+      return Status;
+    }
+
+    Status = AcpiLocateTableBySignature (
+                                         AcpiSdtProtocol,
+                                         EFI_ACPI_6_3_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE,
+                                         &TableIndex,
+                                         &Table,
+                                         &TableKey
+                                         );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "ACPI DSDT table not found!\n"));
+      ASSERT_EFI_ERROR (Status);
+      return Status;
+    }
+
+    Status = AcpiSdtProtocol->OpenSdt (TableKey, &TableHandle);
+    if (EFI_ERROR (Status)) {
+      ASSERT_EFI_ERROR (Status);
+      AcpiSdtProtocol->Close (TableHandle);
+      return Status;
+    }
+
+    Status = AcpiAmlObjectUpdateInteger (AcpiSdtProtocol, TableHandle, "\\_SB.USB0.XHCI", 0x0);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "Failed to disable XHCI!\n"));
+      ASSERT_EFI_ERROR (Status);
+      AcpiSdtProtocol->Close (TableHandle);
+      return Status;
+    }
+
+    AcpiSdtProtocol->Close (TableHandle);
+    AcpiUpdateChecksum ((UINT8 *)Table, Table->Length);
+  }
+
+  return Status;
+}
+
+
 EFI_STATUS
 EFIAPI
 InitializeSbsaQemuAcpiDxe (
@@ -738,5 +805,10 @@ InitializeSbsaQemuAcpiDxe (
     DEBUG ((DEBUG_ERROR, "Failed to add GTDT table\n"));
   }
 
-  return EFI_SUCCESS;
+  Status = DisableXhciOnOlderPlatVer ();
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "Failed to handle XHCI enablement\n"));
+  }
+
+  return Status;
 }
diff --git a/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl b/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl
index 6661bc8195ee..b55ad6c5cc07 100644
--- a/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl
+++ b/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl
@@ -73,8 +73,9 @@ DefinitionBlock ("DsdtTable.aml", "DSDT",
         Name (_HID, "PNP0D10")      // _HID: Hardware ID
         Name (_UID, 0x00)            // _UID: Unique ID
         Name (_CCA, 0x01)            // _CCA: Cache Coherency Attribute
+        Name (XHCI, 0xF)            // will be set using AcpiLib
         Method (_STA) {
-          Return (0xF)
+          Return (XHCI)
         }
         Method (_CRS, 0x0, Serialized) {
             Name (RBUF, ResourceTemplate() {

-- 
2.41.0



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