dev-arm: Add HDLcd DTB autogeneration

A Display has been defined. Its sole purpose is to generate the device
tree node to be referenced by the HDLcd device.  The encoder parameters
are based on the existing node defined in:

system/arm/dt/armv8.dts

Change-Id: I6cdeb0437dce207dbd0f2c65c16b224245eb74e1
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/20330
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

1 files changed, 127 insertions, 0 deletions

diff --git a/src/dev/arm/Display.py b/src/dev/arm/Display.py
new file mode 100644
index 000000000..36e4feaf0
--- /dev/null
+++ b/src/dev/arm/Display.py
@@ -0,0 +1,127 @@
+# Copyright (c) 2019 ARM Limited
+# All rights reserved.
+#
+# The license below extends only to copyright in the software and shall
+# not be construed as granting a license to any other intellectual
+# property including but not limited to intellectual property relating
+# to a hardware implementation of the functionality of the software
+# licensed hereunder.  You may use the software subject to the license
+# terms below provided that you ensure that this notice is replicated
+# unmodified and in its entirety in all distributions of the software,
+# modified or unmodified, in source code or in binary form.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Authors: Giacomo Travaglini
+
+from m5.params import *
+from m5.SimObject import SimObject
+from m5.util.fdthelper import *
+
+class Display(SimObject):
+    type = 'Display'
+    cxx_header = "dev/arm/display.hh"
+    clock_frequency = Param.Unsigned("clock-frequency property")
+    hactive = Param.Unsigned("hactive property")
+    vactive = Param.Unsigned("vactive property")
+    hfront_porch = Param.Unsigned("hfront-porch property")
+    hback_porch = Param.Unsigned("hback-porch property")
+    hsync_len = Param.Unsigned("hsync-len property")
+    vfront_porch = Param.Unsigned("vfront-porch property")
+    vback_porch = Param.Unsigned("vback-porch property")
+    vsync_len = Param.Unsigned("vsync-len property")
+
+    _endpoint_node = None
+
+    def endpointPhandle(self):
+        return "encoder_endpoint"
+
+    def endpointNode(self):
+        assert self._endpoint_node is not None
+        return self._endpoint_node
+
+    def generateDeviceTree(self, state):
+        # timing node
+        timing_node = FdtNode(self.timingNode())
+
+        timing_node.append(FdtPropertyWords(
+            "clock-frequency", [self.clock_frequency]))
+        timing_node.append(FdtPropertyWords(
+            "hactive", [self.hactive]))
+        timing_node.append(FdtPropertyWords(
+            "vactive", [self.vactive]))
+        timing_node.append(FdtPropertyWords(
+            "hfront-porch", [self.hfront_porch]))
+        timing_node.append(FdtPropertyWords(
+            "hback-porch", [self.hback_porch]))
+        timing_node.append(FdtPropertyWords(
+            "hsync-len", [self.hsync_len]))
+        timing_node.append(FdtPropertyWords(
+            "vfront-porch", [self.vfront_porch]))
+        timing_node.append(FdtPropertyWords(
+            "vback-porch", [self.vback_porch]))
+        timing_node.append(FdtPropertyWords(
+            "vsync-len", [self.vsync_len]))
+
+        timing_node.appendPhandle(self.timingNode())
+
+        # display timing node
+        dispt_node = FdtNode("display-timings")
+        dispt_node.append(FdtPropertyWords("native-mode",
+            state.phandle(self.timingNode())))
+        dispt_node.append(timing_node)
+
+        # endpoint node
+        endpoint_node = FdtNode("endpoint")
+        endpoint_node.appendPhandle(
+            self.endpointPhandle())
+
+        # Assign node so that it can be retrieved
+        self._endpoint_node = endpoint_node
+
+        # port node
+        port_node = FdtNode("port")
+        port_node.append(endpoint_node)
+
+        # Virt-encoder
+        node = FdtNode("virt-encoder")
+        node.appendCompatible(["drm,virtual-encoder"])
+        node.append(dispt_node)
+        node.append(port_node)
+
+        yield node
+
+class Display1080p(Display):
+    clock_frequency = 148500000
+    hactive = 1920
+    vactive = 1080
+    hfront_porch = 148
+    hback_porch = 88
+    hsync_len = 44
+    vfront_porch = 36
+    vback_porch = 4
+    vsync_len = 5
+
+    def timingNode(self):
+        return "timing_1080p60"