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[0/5] arm: exynos: Enable TRNG for E850-96 board

Message ID 20240712234304.9675-1-semen.protsenko@linaro.org
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Series arm: exynos: Enable TRNG for E850-96 board | expand

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Sam Protsenko July 12, 2024, 11:42 p.m. UTC 
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
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.

[1] https://lore.kernel.org/all/20240618003743.2975-1-semen.protsenko@linaro.org/T/#me6ba1762a254ca438a9715f011d32820babfe2d8

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                        |   7 +
 drivers/rng/Makefile                       |   1 +
 drivers/rng/exynos-trng.c                  | 275 +++++++++++++++++++++
 12 files changed, 482 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