This engine implements AES in CBC mode, using 128-bit keys only. It is present on both the Wii and the Wii U, and is apparently identical in both consoles. The hardware is capable of firing an interrupt when the operation is done, but this driver currently uses a busy loop, I’m not too sure whether it would be preferable to switch, nor how to achieve that. It also supports a mode where no operation is done, and thus could be used as a DMA copy engine, but I don’t know how to expose that to the kernel or whether it would even be useful. In my testing, on a Wii U, this driver reaches 80.7 MiB/s, while the aes-generic driver only reaches 30.9 MiB/s, so it is a quite welcome speedup. This driver was written based on reversed documentation, see: https://wiibrew.org/wiki/Hardware/AES Emmanuel Gil Peyrot (4): crypto: nintendo-aes - add a new AES driver dt-bindings: nintendo-aes: Document the Wii and Wii U AES support powerpc: wii.dts: Expose the AES engine on this platform powerpc: wii_defconfig: Enable AES by default .../bindings/crypto/nintendo-aes.yaml | 34 +++ arch/powerpc/boot/dts/wii.dts | 7 + arch/powerpc/configs/wii_defconfig | 4 +- drivers/crypto/Kconfig | 11 + drivers/crypto/Makefile | 1 + drivers/crypto/nintendo-aes.c | 273 ++++++++++++++++++ 6 files changed, 329 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/crypto/nintendo-aes.yaml create mode 100644 drivers/crypto/nintendo-aes.c -- 2.33.0
