linux-kernel - [PATCH 4/5] arm64: dts: ti: k3-am64: Fix gic-v3 compatible regs

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Date:   Tue, 15 Feb 2022 14:10:07 -0600
From:   Nishanth Menon <nm@...com>
To:     Tero Kristo <kristo@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Marc Zyngier <maz@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Rob Herring <robh+dt@...nel.org>, Nishanth Menon <nm@...com>,
        <stable@...r.kernel.org>
Subject: [PATCH 4/5] arm64: dts: ti: k3-am64: Fix gic-v3 compatible regs

Though GIC ARE option is disabled for no GIC-v2 compatibility,
Cortex-A53 is free to implement the CPU interface as long as it
communicates with the GIC using the stream protocol. This requires
that the SoC integration mark out the PERIPHBASE[1] as reserved area
within the SoC. See longer discussion in [2] for further information.

Update the GIC register map to indicate offsets from PERIPHBASE based
on [3]. Without doing this, systems like kvm will not function with
gic-v2 emulation.

[1] https://developer.arm.com/documentation/ddi0500/e/system-control/aarch64-register-descriptions/configuration-base-address-register--el1
[2] https://lore.kernel.org/all/87k0e0tirw.wl-maz@kernel.org/
[3] https://developer.arm.com/documentation/ddi0500/e/generic-interrupt-controller-cpu-interface/gic-programmers-model/memory-map

Fixes: 8abae9389bdb ("arm64: dts: ti: Add support for AM642 SoC")
Cc: stable@...r.kernel.org
Reported-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Nishanth Menon <nm@...com>
---
Testing: based on next-20220215

AM64xx-sk: https://gist.github.com/nmenon/75d413e53005fabc4bde8a4efe227594

 arch/arm64/boot/dts/ti/k3-am64-main.dtsi | 5 ++++-
 arch/arm64/boot/dts/ti/k3-am64.dtsi      | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
index 0c9f3bce8418..f64b368c6c37 100644
--- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
@@ -59,7 +59,10 @@ gic500: interrupt-controller@...0000 {
 		#interrupt-cells = <3>;
 		interrupt-controller;
 		reg = <0x00 0x01800000 0x00 0x10000>,	/* GICD */
-		      <0x00 0x01840000 0x00 0xC0000>;	/* GICR */
+		      <0x00 0x01840000 0x00 0xC0000>,	/* GICR */
+		      <0x01 0x00000000 0x00 0x2000>,	/* GICC */
+		      <0x01 0x00010000 0x00 0x1000>,	/* GICH */
+		      <0x01 0x00020000 0x00 0x2000>;	/* GICV */
 		/*
 		 * vcpumntirq:
 		 * virtual CPU interface maintenance interrupt
diff --git a/arch/arm64/boot/dts/ti/k3-am64.dtsi b/arch/arm64/boot/dts/ti/k3-am64.dtsi
index 84bd07cd1824..e88349846871 100644
--- a/arch/arm64/boot/dts/ti/k3-am64.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am64.dtsi
@@ -89,6 +89,7 @@ cbass_main: bus@...00 {
 			 <0x00 0x68000000 0x00 0x68000000 0x00 0x08000000>, /* PCIe DAT0 */
 			 <0x00 0x70000000 0x00 0x70000000 0x00 0x00200000>, /* OC SRAM */
 			 <0x00 0x78000000 0x00 0x78000000 0x00 0x00800000>, /* Main R5FSS */
+			 <0x01 0x00000000 0x01 0x00000000 0x00 0x00310000>, /* A53 PERIPHBASE */
 			 <0x06 0x00000000 0x06 0x00000000 0x01 0x00000000>, /* PCIe DAT1 */
 			 <0x05 0x00000000 0x05 0x00000000 0x01 0x00000000>, /* FSS0 DAT3 */
 
-- 
2.31.1