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5a5e9c0228
Add a driver for Arm Ethos-U65/U85 NPUs. The Ethos-U NPU has a relatively simple interface with single command stream to describe buffers, operation settings, and network operations. It supports up to 8 memory regions (though no h/w bounds on a region). The Ethos NPUs are designed to use an SRAM for scratch memory. Region 2 is reserved for SRAM (like the downstream driver stack and compiler). Userspace doesn't need access to the SRAM. The h/w has no MMU nor external IOMMU and is a DMA engine which can read and write anywhere in memory without h/w bounds checks. The user submitted command streams must be validated against the bounds of the GEM BOs. This is similar to the VC4 design which validates shaders. The job submit is based on the rocket driver for the Rockchip NPU utilizing the GPU scheduler. It is simpler as there's only 1 core rather than 3. Tested on i.MX93 platform (U65) and FVP (U85) with Mesa Teflon support. Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Tomeu Vizoso <tomeu@tomeuvizoso.net> Reviewed-by: Frank Li <Frank.Li@nxp.com> Link: https://patch.msgid.link/20251020-ethos-v6-2-ecebc383c4b7@kernel.org Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
12 lines
269 B
Plaintext
12 lines
269 B
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config DRM_ACCEL_ARM_ETHOSU
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tristate "Arm Ethos-U65/U85 NPU"
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depends on HAS_IOMEM
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depends on DRM_ACCEL
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select DRM_GEM_DMA_HELPER
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select DRM_SCHED
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select GENERIC_ALLOCATOR
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help
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Enables driver for Arm Ethos-U65/U85 NPUs
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