From: Mukesh Ojha mukesh.ojha@oss.qualcomm.com
All the existing variants Kodiak boards are using Gunyah hypervisor which means that, so far, Linux-based OS could only boot in EL1 on those devices. However, it is possible for us to boot Linux at EL2 on these devices [1].
When running under Gunyah, the remote processor firmware IOMMU streams are controlled by Gunyah. However, without Gunyah, the IOMMU is managed by the consumer of this DeviceTree. Therefore, describe the firmware streams for each remote processor.
Add a EL2-specific DT overlay and apply it to Kodiak IOT variant devices to create -el2.dtb for each of them alongside "normal" dtb.
Note that modem and media subsystems haven't been supported yet due to missing dependencies. For GPU to work, zap shader is disabled and in EL2 mode the kernel owns hardware watchdog which is enabled here.
[1] https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-4/boot-devel...
Signed-off-by: Mukesh Ojha mukesh.ojha@oss.qualcomm.com [SG: watchdog and modem fixup] Signed-off-by: Sumit Garg sumit.garg@oss.qualcomm.com --- arch/arm64/boot/dts/qcom/Makefile | 2 ++ arch/arm64/boot/dts/qcom/kodiak-el2.dtso | 39 ++++++++++++++++++++++++ 2 files changed, 41 insertions(+) create mode 100644 arch/arm64/boot/dts/qcom/kodiak-el2.dtso
diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile index 795cee4757ab..d10490590e4c 100644 --- a/arch/arm64/boot/dts/qcom/Makefile +++ b/arch/arm64/boot/dts/qcom/Makefile @@ -176,6 +176,8 @@ qcs615-ride-el2-dtbs := qcs615-ride.dtb talos-el2.dtbo dtb-$(CONFIG_ARCH_QCOM) += qcs615-ride-el2.dtb dtb-$(CONFIG_ARCH_QCOM) += qcs6490-radxa-dragon-q6a.dtb dtb-$(CONFIG_ARCH_QCOM) += qcs6490-rb3gen2.dtb +qcs6490-rb3gen2-el2-dtbs := qcs6490-rb3gen2.dtb kodiak-el2.dtbo +dtb-$(CONFIG_ARCH_QCOM) += qcs6490-rb3gen2-el2.dtb
qcs6490-rb3gen2-vision-mezzanine-dtbs := qcs6490-rb3gen2.dtb qcs6490-rb3gen2-vision-mezzanine.dtbo qcs6490-rb3gen2-industrial-mezzanine-dtbs := qcs6490-rb3gen2.dtb qcs6490-rb3gen2-industrial-mezzanine.dtbo diff --git a/arch/arm64/boot/dts/qcom/kodiak-el2.dtso b/arch/arm64/boot/dts/qcom/kodiak-el2.dtso new file mode 100644 index 000000000000..520ed582370d --- /dev/null +++ b/arch/arm64/boot/dts/qcom/kodiak-el2.dtso @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: BSD-3-Clause +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + * + * Kodiak specific modifications required to boot in EL2. + */ + + +/dts-v1/; +/plugin/; + +&gpu_zap_shader { + status = "disabled"; +}; + +&remoteproc_adsp { + iommus = <&apps_smmu 0x1800 0x0>; +}; + +&remoteproc_cdsp { + iommus = <&apps_smmu 0x11a0 0x0400>; +}; + +&remoteproc_mpss { + status = "disabled"; +}; + +&remoteproc_wpss { + iommus = <&apps_smmu 0x1c03 0x1>, + <&apps_smmu 0x1c83 0x1>; +}; + +&venus { + status = "disabled"; +}; + +&watchdog { + status = "okay"; +};