Platform/DeveloperBox: make PCIe BME defer dip switch configurabledeveloper-box-from-hell

Tie DIP switch DSW3-5 to the dynamic PCD that defers enabling of the
PCIe Bus Master Enable bit to the first PciIo->Map() call made by the
driver. This helps identify drivers that don't bother to use Map/Unmap
at all, which is a violation of the UEFI spec.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/Silicon/Socionext/SynQuacer/Library/SynQuacerPlatformPeiLib/SynQuacerPlatformPeiLib.c b/Silicon/Socionext/SynQuacer/Library/SynQuacerPlatformPeiLib/SynQuacerPlatformPeiLib.c
index af8dfd12..3f6dbcec 100644
--- a/Silicon/Socionext/SynQuacer/Library/SynQuacerPlatformPeiLib/SynQuacerPlatformPeiLib.c
+++ b/Silicon/Socionext/SynQuacer/Library/SynQuacerPlatformPeiLib/SynQuacerPlatformPeiLib.c
@@ -164,6 +164,16 @@ PlatformPeim (
   }

 

   Value = 0;

+  Status = ReadGpioInput (Gpio, FixedPcdGet8 (PcdDeferBusMasterEnableGpioPin),

+             &Value);

+  if (!EFI_ERROR (Status) && Value != 0) {

+    DEBUG ((DEBUG_WARN, "%a: deferring PCI bus master enable to PciIo->Map() call\n",

+      __FUNCTION__));

+    Status = PcdSetBoolS (PcdDeferBusMasterEnableToPciIoMap, TRUE);

+    ASSERT_EFI_ERROR (Status);

+  }

+

+  Value = 0;

   Status = ReadGpioInput (Gpio, FixedPcdGet8 (PcdIgnoreFirstMemRegionGpioPin),

              &Value);

   if (!EFI_ERROR (Status) && Value != 0) {