This series enables True Random Number Generator (TRNG) for E850-96 board. Here is a short breakdown of features implemented in this series:
1. Load LDFW (Loadable Firmware) on E850-96 board. It's needed to make TRNG SMC commands functional. To do so, add the default eMMC partition table and implement reading and applying LDFW in board_init(). 2. Add Exynos TRNG driver 3. Enable Exynos TRNG driver on E850-96 board. It requires SSS clocks to be enabled, so add those clocks as well.
With this series it's possible to generate random numbers in U-Boot (e.g. using 'rng' command). The main reason for RNG enablement on E850-96 board -- it's needed for EFI_RNG_PROTOCOL and kaslr, so it's one of the requirements to enable EFI boot support on E850-96 board, which in turn is needed (among other things) for EBBR spec and SystemReady IR certification. With this series it's also possible to use TRNG in Linux kernel (which was recently added, see [1] for details), as Linux kernel Exynos TRNG driver also relies on LDFW firmware to be loaded in the bootloader.
Changes in v2: - Addressed comments for [PATCH 4/5] rng: Add Exynos TRNG driver
[1] https://lore.kernel.org/all/20240618003743.2975-1-semen.protsenko@linaro.org...
Sam Protsenko (5): board: samsung: e850-96: Add default partitions board: samsung: e850-96: Load LDFW firmware on board init clk: exynos: Add SSS clocks for Exynos850 rng: Add Exynos TRNG driver arm: exynos: Enable TRNG on E850-96 board
arch/arm/dts/exynos850-e850-96-u-boot.dtsi | 11 + arch/arm/mach-exynos/Kconfig | 2 + board/samsung/e850-96/Makefile | 4 +- board/samsung/e850-96/e850-96.c | 6 +- board/samsung/e850-96/e850-96.env | 26 ++ board/samsung/e850-96/fw.c | 131 ++++++++++ board/samsung/e850-96/fw.h | 12 + configs/e850-96_defconfig | 1 + drivers/clk/exynos/clk-exynos850.c | 10 + drivers/rng/Kconfig | 13 + drivers/rng/Makefile | 1 + drivers/rng/exynos-trng.c | 291 +++++++++++++++++++++ 12 files changed, 504 insertions(+), 4 deletions(-) create mode 100644 board/samsung/e850-96/e850-96.env create mode 100644 board/samsung/e850-96/fw.c create mode 100644 board/samsung/e850-96/fw.h create mode 100644 drivers/rng/exynos-trng.c