These patches add support for the UEFI SPI I/O protocol defined in the UEFI Platform Initialization (PI) Specification, Version 1.7 Errata A (April 2020). This allows a UEFI application to interact with devices on the SPI bus.
The code here is self-contained and easy to enable/disable at compile time. Compilation testing with am335x_evm_defconfig shows that the size of u-boot.img increases by less than 2kB when CONFIG_EFI_SPI_PROTOCOL is enabled.
Changes since v1:
* Do not enable CONFIG_EFI_SPI_PROTOCOL by default.
* Add efi_seltest unit test.
* Mark functions with EFIAPI where necessary.
* Handle debug_transaction argument to efi_spi_io_transaction().
* Handle a value of zero for target->max_read_size & target->max_write_size.
* Probe inactive SPI devices when initializing the EFI SPI protocol to ensure that dev_get_parent_priv() returns valid data and the exported devices are ready to use.
* Skip emulated SPI peripherals. These appear as duplicates within the list of devices on the bus when using the sandbox SPI drivers.
* Make most printf statements debug only.
Paul Barker (3): efi_loader: Add SPI I/O protocol support arm: dts: am335x-sancloud-bbe-lite: UEFI SPI export am335x_evm_defconfig: Enable Micron SPI flash support
MAINTAINERS | 7 + arch/arm/dts/am335x-sancloud-bbe-lite.dts | 8 +- arch/sandbox/dts/test.dts | 8 + configs/am335x_evm_defconfig | 1 + include/efi_loader.h | 4 + include/efi_spi_protocol.h | 158 +++++ lib/efi_loader/Kconfig | 8 + lib/efi_loader/Makefile | 1 + lib/efi_loader/efi_setup.c | 6 + lib/efi_loader/efi_spi_protocol.c | 614 +++++++++++++++++++ lib/efi_selftest/Makefile | 1 + lib/efi_selftest/efi_selftest_spi_protocol.c | 237 +++++++ 12 files changed, 1051 insertions(+), 2 deletions(-) create mode 100644 include/efi_spi_protocol.h create mode 100644 lib/efi_loader/efi_spi_protocol.c create mode 100644 lib/efi_selftest/efi_selftest_spi_protocol.c
base-commit: 707b17f64e71fad1615ea25082f2e928f712e366