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, smem is also largely useful for parsing the memory map and other tasks which we have to do before DM is alive anyway. 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 than would be possible with a standard udevice. 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 and 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. Since the memory map stored in SMEM doesn't already have some carveouts let's also be correct about unmapping reserved memory regions, we should eventually do this on all Qualcomm boards but it's particularly important when we aren't chainloading from ABL. This depends on a fix for unmapping memory regions: https://lore.kernel.org/u-boot/[email protected]/ --- Changes in v2: - Ensure reserved regions are unmapped appropriately when using SMEM as the source of truth for the memory map. - Support SMEM ram layout v0/v1 for older platforms using a header from Qualcomm. - Set an environment variable (memmap_source) providing info about where U-Boots memory map is from. - Correctly handle serial_num missing on msm8916 - Link to v1: https://lore.kernel.org/r/[email protected] To: [email protected] To: Sumit Garg <[email protected]> To: [email protected] Cc: Tom Rini <[email protected]> Cc: Simon Glass <[email protected]> Cc: Casey Connolly <[email protected]> Cc: Peng Fan <[email protected]> Cc: Marek Vasut <[email protected]> Cc: Alice Guo <[email protected]> Cc: Quentin Schulz <[email protected]> Cc: Ilias Apalodimas <[email protected]> Cc: Neil Armstrong <[email protected]> Cc: Mattijs Korpershoek <[email protected]> Cc: Kuan-Wei Chiu <[email protected]> Cc: Raymond Mao <[email protected]> Cc: Stefan Roese <[email protected]> Cc: Philip Molloy <[email protected]> Cc: Jerome Forissier <[email protected]> Cc: Marek Vasut <[email protected]> Cc: Varadarajan Narayanan <[email protected]> Cc: Patrice Chotard <[email protected]> Cc: Aswin Murugan <[email protected]> Cc: Rasmus Villemoes <[email protected]> Cc: Heiko Schocher <[email protected]> Cc: Michal Simek <[email protected]> Cc: Sughosh Ganu <[email protected]> Cc: Antony Kurniawan Soemardi <[email protected]> Cc: Luca Weiss <[email protected]> Cc: Balaji Selvanathan <[email protected]> --- Casey Connolly (15): Revert "dm: SMEM (Shared memory) uclass" smem: drop drivers/smem Revert "test: smem: add basic smem test" Revert "drivers: smem: sandbox" mach-snapdragon: fix reserved memory carveout 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: move memory parsing to its own file mach-snapdragon: support parsing memory map from SMEM mach-snapdragon: fetch serial# from SMEM configs: add qcom_sm8650_defconfig and debug fragment MAINTAINERS | 1 - arch/arm/Kconfig | 3 +- arch/arm/mach-snapdragon/Makefile | 2 +- arch/arm/mach-snapdragon/board.c | 253 ++++----- arch/arm/mach-snapdragon/dram.c | 239 ++++++++ arch/arm/mach-snapdragon/qcom-priv.h | 17 + arch/arm/mach-snapdragon/rampart.h | 194 +++++++ arch/sandbox/dts/test.dts | 4 - board/qualcomm/debug-sm8650.config | 5 + configs/qcom_sm8650_defconfig | 16 + configs/sandbox64_defconfig | 2 - configs/sandbox_defconfig | 2 - drivers/Kconfig | 2 - drivers/Makefile | 1 - drivers/smem/Kconfig | 25 - 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} | 777 ++++++++++++++++----------- 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 - 27 files changed, 1186 insertions(+), 728 deletions(-) --- base-commit: 2920b49fb117dd70b6219804bf0d298c96f184f2 // Casey (she/they)
