linux-kernel - [PATCH 3/4] arm64: dts: imx8ulp-evk: add nxp secure enclave firmware

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Date: Fri, 10 May 2024 18:57:29 +0530
From: Pankaj Gupta <pankaj.gupta@....com>
To: Jonathan Corbet <corbet@....net>, Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, Pankaj Gupta <pankaj.gupta@....com>
Subject: [PATCH 3/4] arm64: dts: imx8ulp-evk: add nxp secure enclave
 firmware

Add support for NXP secure enclave called EdgeLock Enclave
firmware (se-fw) for imx8ulp-evk.

EdgeLock Enclave has a hardware limitation of restricted access to DDR
address: 0x80000000 to 0xAFFFFFFF, so reserve 1MB of DDR memory region
from 0x80000000.

Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
---
 arch/arm64/boot/dts/freescale/imx8ulp-evk.dts | 17 ++++++++++++++++-
 arch/arm64/boot/dts/freescale/imx8ulp.dtsi    | 18 ++++++++++++++++--
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts b/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
index 69dd8e31027c..bac08297ef68 100644
--- a/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
 /*
- * Copyright 2021 NXP
+ * Copyright 2021, 2024 NXP
  */
 
 /dts-v1/;
@@ -19,6 +19,17 @@ memory@...00000 {
 		device_type = "memory";
 		reg = <0x0 0x80000000 0 0x80000000>;
 	};
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		ele_reserved: ele-reserved@...00000 {
+			compatible = "shared-dma-pool";
+			reg = <0 0x90000000 0 0x100000>;
+			no-map;
+		};
+	};
 
 	reserved-memory {
 		#address-cells = <2>;
@@ -146,6 +157,10 @@ &usdhc0 {
 	status = "okay";
 };
 
+&ele_if0 {
+	memory-region = <&ele_reserved>;
+};
+
 &fec {
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&pinctrl_enet>;
diff --git a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi b/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
index c4a0082f30d3..fc00f05fa166 100644
--- a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
 /*
- * Copyright 2021 NXP
+ * Copyright 2021, 2024 NXP
  */
 
 #include <dt-bindings/clock/imx8ulp-clock.h>
@@ -152,7 +152,7 @@ sosc: clock-sosc {
 		#clock-cells = <0>;
 	};
 
-	sram@...1f000 {
+	sram0: sram@...1f000 {
 		compatible = "mmio-sram";
 		reg = <0x0 0x2201f000 0x0 0x1000>;
 
@@ -184,6 +184,20 @@ scmi_sensor: protocol@15 {
 				#thermal-sensor-cells = <1>;
 			};
 		};
+
+		ele {
+			compatible = "fsl,imx8ulp-ele";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			ele_if0: ele-if@0 {
+				reg = <0x0>;
+				mbox-names = "tx", "rx";
+				mboxes = <&s4muap 0 0>,
+					<&s4muap 1 0>;
+				sram = <&sram0>;
+			};
+		};
 	};
 
 	cm33: remoteproc-cm33 {

-- 
2.34.1