[v5,0/3] MediaTek Security random number generator support

Message

Neal Liu Nov. 27, 2019, 2:22 p.m. UTC

These patch series introduce a generic rng driver for Trustzone
based kernel driver which would like to communicate with ATF
SIP services.

Patch #1 initials SMC fid table for Mediatek SIP interfaces and
adds HWRNG related SMC call.

Patch #2..3 adds mtk-sec-rng kernel driver for Trustzone based SoCs.
For MediaTek SoCs on ARMv8 with TrustZone enabled, peripherals like
entropy sources is not accessible from normal world (linux) and
rather accessible from secure world (ATF/TEE) only.
This driver aims to provide a generic interface to ATF rng service.


changes since v1:
- rename mt67xx-rng to mtk-sec-rng since all MediaTek ARMv8 SoCs can reuse
  this driver.
- refine coding style and unnecessary check.

changes since v2:
- remove unused comments.
- remove redundant variable.

changes since v3:
- add dt-bindings for MediaTek rng with TrustZone enabled.
- revise HWRNG SMC call fid.

changes since v4:
- move bindings to the arm/firmware directory.
- revise driver init flow to check more property.


Neal Liu (3):
  soc: mediatek: add SMC fid table for SIP interface
  dt-bindings: rng: add bindings for MediaTek ARMv8 SoCs
  hwrng: add mtk-sec-rng driver

 .../arm/firmware/mediatek,mtk-sec-rng.txt     |  18 +++
 drivers/char/hw_random/Kconfig                |  16 +++
 drivers/char/hw_random/Makefile               |   1 +
 drivers/char/hw_random/mtk-sec-rng.c          | 103 ++++++++++++++++++
 include/linux/soc/mediatek/mtk_sip_svc.h      |  33 ++++++
 5 files changed, 171 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/firmware/mediatek,mtk-sec-rng.txt
 create mode 100644 drivers/char/hw_random/mtk-sec-rng.c
 create mode 100644 include/linux/soc/mediatek/mtk_sip_svc.h