[edk2-devel] [PATCH 5/5] Platform/RaspberryPi: Update PCIe MMIO window for DT

["Jeremy Linton" <jeremy.linton@arm.com>]

Since we are updating the DT memory map and telling it how
we have configured the PCIe, there isn't a reason for moving the
MMIO window. In fact this appears to fix OpenBSD+DT as well as
it makes the linux XHCI reset sequence happier.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
---
 Platform/RaspberryPi/Drivers/FdtDxe/FdtDxe.c | 24 ++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Platform/RaspberryPi/Drivers/FdtDxe/FdtDxe.c b/Platform/RaspberryPi/Drivers/FdtDxe/FdtDxe.c
index dd4fc0a05e..e6942df6a3 100644
--- a/Platform/RaspberryPi/Drivers/FdtDxe/FdtDxe.c
+++ b/Platform/RaspberryPi/Drivers/FdtDxe/FdtDxe.c
@@ -375,6 +375,30 @@ SyncPcie (
     return EFI_NOT_FOUND;
   }

+  // move the MMIO window too
+  DmaRanges[0] = cpu_to_fdt32 (0x02000000); //non prefech 32-bit
+  DmaRanges[1] = cpu_to_fdt32 (0x00000000); //bus addr @ 0x0f8000000
+  DmaRanges[2] = cpu_to_fdt32 (0xf8000000);
+  DmaRanges[3] = cpu_to_fdt32 (0x00000006); //cpu addr @ 0x600000000
+  DmaRanges[4] = cpu_to_fdt32 (0x00000000);
+  DmaRanges[5] = cpu_to_fdt32 (0x00000000);
+  DmaRanges[6] = cpu_to_fdt32 (0x04000000); // len = 0x4000 0000
+
+  DEBUG ((DEBUG_INFO, "%a: Updating PCIe ranges\n",  __func__));
+
+  /*
+   * Match dma-ranges with the EDK2+ACPI setup we are using.  This works
+   * around a failure in Linux and OpenBSD to reset the PCIe/XHCI correctly
+   * when in DT mode.
+   */
+  Retval = fdt_setprop (mFdtImage, Node, "ranges",
+                        DmaRanges,  sizeof DmaRanges);
+  if (Retval != 0) {
+    DEBUG ((DEBUG_ERROR, "%a: failed to locate PCIe MMIO 'ranges' property (%d)\n",
+      __func__, Retval));
+    return EFI_NOT_FOUND;
+  }
+
   if (PcdGet32 (PcdXhciReload) != 1) {
     return EFI_SUCCESS;
   }
--
2.43.0



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