linux-kernel - [PATCH v4 2/3] arm64: dts: ti: k3-am64-main: Reserve OCMRAM for DMSC-lite and secure proxy communication

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Message-ID: <20210615174325.22853-3-a-govindraju@ti.com>
Date:   Tue, 15 Jun 2021 23:13:24 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     unlisted-recipients:; (no To-header on input)
CC:     Vignesh Raghavendra <vigneshr@...com>, Suman Anna <s-anna@...com>,
        Lokesh Vutla <lokeshvutla@...com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Aswath Govindraju <a-govindraju@...com>,
        Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v4 2/3] arm64: dts: ti: k3-am64-main: Reserve OCMRAM for DMSC-lite and secure proxy communication

The final 128KB in SRAM is reserved by default for DMSC-lite code and
secure proxy communication buffer. The memory region used for DMSC-lite
code can be optionally freed up by secure firmware API[1]. However, the
buffer for secure proxy communication is not configurable. This default
hardware configuration is unique for AM64.

Therefore, indicate the area reserved for DMSC-lite code and secure proxy
communication buffer in the oc_sram device tree node.

[1] - http://downloads.ti.com/tisci/esd/latest/6_topic_user_guides/security_handover.html#triggering-security-handover

Signed-off-by: Aswath Govindraju <a-govindraju@...com>
---
 arch/arm64/boot/dts/ti/k3-am64-main.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
index 693fe24e7f7a..6a883f4349cb 100644
--- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
@@ -27,6 +27,14 @@
 		tfa-sram@0 {
 			reg = <0x0 0x1c000>;
 		};
+
+		dmsc-sram@...000 {
+			reg = <0x1e0000 0x1c000>;
+		};
+
+		sproxy-sram@...000 {
+			reg = <0x1fc000 0x4000>;
+		};
 	};
 
 	main_conf: syscon@...00000 {
-- 
2.17.1