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This initial version supports the NPU as shipped in the RK3588 SoC and described in the first part of its TRM, in Chapter 36. This NPU contains 3 independent cores that the driver can submit jobs to. This commit adds just hardware initialization and power management. v2: - Split cores and IOMMUs as independent devices (Sebastian Reichel) - Add some documentation (Jeffrey Hugo) - Be more explicit in the Kconfig documentation (Jeffrey Hugo) - Remove resets, as these haven't been found useful so far (Zenghui Yu) - Repack structs (Jeffrey Hugo) - Use DEFINE_DRM_ACCEL_FOPS (Jeffrey Hugo) - Use devm_drm_dev_alloc (Jeffrey Hugo) - Use probe log helper (Jeffrey Hugo) - Introduce UABI header in a later patch (Jeffrey Hugo) v3: - Adapt to a split of the register block in the DT bindings (Nicolas Frattaroli) - Move registers header to its own commit (Thomas Zimmermann) - Misc. cleanups (Thomas Zimmermann and Jeff Hugo) - Make use of GPL-2.0-only for the copyright notice (Jeff Hugo) - PM improvements (Nicolas Frattaroli) v4: - Use bulk clk API (Krzysztof Kozlowski) v6: - Remove mention to NVDLA, as the hardware is only incidentally related (Kever Yang) - Use calloc instead of GFP_ZERO (Jeff Hugo) - Explicitly include linux/container_of.h (Jeff Hugo) - pclk and npu clocks are now needed by all cores (Rob Herring) v7: - Assign its own IOMMU domain to each client, for isolation (Daniel Stone and Robin Murphy) v8: - Kconfig: fix depends to be more explicit about Rockchip, and remove superfluous selects (Robin Murphy) - Use reset lines to reset the cores (Robin Murphy) - Reference count the module - Set dma_set_max_seg_size - Correctly acquire a reference to the IOMMU (Robin Murphy) - Remove notion of top core (Robin Murphy) Reviewed-by: Robert Foss <rfoss@kernel.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com> Signed-off-by: Tomeu Vizoso <tomeu@tomeuvizoso.net> Signed-off-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com> Link: https://lore.kernel.org/r/20250721-6-10-rocket-v9-2-77ebd484941e@tomeuvizoso.net
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20 lines
657 B
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.. SPDX-License-Identifier: GPL-2.0-only
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=====================================
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accel/rocket Rockchip NPU driver
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=====================================
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The accel/rocket driver supports the Neural Processing Units (NPUs) inside some
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Rockchip SoCs such as the RK3588. Rockchip calls it RKNN and sometimes RKNPU.
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The hardware is described in chapter 36 in the RK3588 TRM.
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This driver just powers the hardware on and off, allocates and maps buffers to
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the device and submits jobs to the frontend unit. Everything else is done in
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userspace, as a Gallium driver (also called rocket) that is part of the Mesa3D
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project.
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Hardware currently supported:
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* RK3588
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