Smem is currently implemented a uclass in U-Boot. This carries with it some implicit limitations about how and when we can actually talk with it, since its modelled as a device.
The SMEM uclass is qualcomm specific and has no other users, while it was originally proposed as a platform agnostic abstraction it seems clear that UCLASS_MISC has served that purpose better.
Let's drop the old smem code and replace it with a straight port from Linux, providing a familiar interface and enabling us to access it much earlier in the boot process that would be possible with a standard device.
Additionally, this will be easier to maintain going forwards since any patches from Linux can be more easily ported over.
With this new smem framework in place, we can now use SMEM to parse the memory map when it's not provided via some other mechanism. Additionally, we can use it to read the serial number of the board.
Implement this functionality and split the snapdragon memory parsing off to its own file to try and organise things a bit better.
This depends on a patch [1] making malloc available in fdtdec_setup() since malloc is required to initialise smem.
[1]: https://lore.kernel.org/u-boot/20241124183832.2476928-1-caleb.connolly@linar...
--- Caleb Connolly (15): Revert "dm: SMEM (Shared memory) uclass" smem: drop drivers/smem Revert "test: smem: add basic smem test" Revert "drivers: smem: sandbox" soc: qcom: import smem from Linux 6.11-rc2 soc: qcom: smem: adjust headers for U-Boot soc: qcom: smem: adjust for U-Boot soc: qcom: smem: get serial number from socinfo soc: qcom: smem: stub functions soc: qcom: smem: add build infra mach-snapdragon: increase pre-relocation malloc size for smem mach-snapdragon: move memory parsing to its own file mach-snapdragon: support parsing memory map from SMEM mach-snapdragon: fetch serial# from SMEM qcom_defconfig: enable QCOM_SMEM
arch/arm/Kconfig | 2 - arch/arm/mach-snapdragon/Kconfig | 2 +- arch/arm/mach-snapdragon/Makefile | 2 +- arch/arm/mach-snapdragon/board.c | 107 +--- arch/arm/mach-snapdragon/dram.c | 214 ++++++++ arch/arm/mach-snapdragon/qcom-priv.h | 4 + arch/sandbox/dts/test.dts | 4 - configs/qcom_defconfig | 1 + configs/sandbox64_defconfig | 2 - configs/sandbox_defconfig | 2 - drivers/Kconfig | 2 - drivers/Makefile | 1 - drivers/smem/Kconfig | 24 - drivers/smem/Makefile | 7 - drivers/smem/sandbox_smem.c | 44 -- drivers/smem/smem-uclass.c | 46 -- drivers/soc/qcom/Kconfig | 8 + drivers/soc/qcom/Makefile | 1 + drivers/{smem/msm_smem.c => soc/qcom/smem.c} | 741 ++++++++++++++++----------- include/dm/uclass-id.h | 1 - include/smem.h | 90 ---- include/soc/qcom/smem.h | 36 ++ include/soc/qcom/socinfo.h | 111 ++++ test/dm/Makefile | 1 - test/dm/smem.c | 26 - 25 files changed, 842 insertions(+), 637 deletions(-) --- base-commit: 7aad7833323aa9260935d172744a50f56356d52a
// Caleb (they/them)