dev: Enable DTB IOMMU binding with a DMA object
This happens by storing a iommu reference in the dma device, and by
calling the addIommuProperty method once doing dtb autogeneration for
the device
Change-Id: Ibd585addac686a9eeaba6959f459d81901087549
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/20839
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/src/dev/Device.py b/src/dev/Device.py
index 0023f97..4930895 100644
--- a/src/dev/Device.py
+++ b/src/dev/Device.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2012-2016 ARM Limited
+# Copyright (c) 2012-2016,2019 ARM Limited
# All rights reserved.
#
# The license below extends only to copyright in the software and shall
@@ -84,6 +84,8 @@
abstract = True
dma = MasterPort("DMA port")
+ _iommu = None
+
sid = Param.Unsigned(0,
"Stream identifier used by an IOMMU to distinguish amongst "
"several devices attached to it")
@@ -91,6 +93,17 @@
"Substream identifier used by an IOMMU to distinguish amongst "
"several devices attached to it")
+ def addIommuProperty(self, state, node):
+ """
+ This method takes an FdtState and a FdtNode as parameters, and
+ it is appending a "iommus = <>" property in case the DmaDevice
+ is attached to an IOMMU.
+ This method is necessary for autogenerating a binding between
+ a dma device and the iommu.
+ """
+ if self._iommu is not None:
+ node.append(FdtPropertyWords("iommus",
+ [ state.phandle(self._iommu), self.sid ]))
class IsaFake(BasicPioDevice):
type = 'IsaFake'
