[PATCH v2 00/15] qcom: smem: modernize SMEM in U-Boot

[Casey Connolly]

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/20260504175511.585797-1-casey.connolly@linaro.org/

---
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/20241124-b4-modernise-smem-v1-0-b7852c11b67c@linaro.org

To: u-boot at lists.denx.de
To: Sumit Garg <sumit.garg at kernel.org>
To: u-boot-qcom at groups.io
Cc: Tom Rini <trini at konsulko.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Casey Connolly <casey.connolly at linaro.org>
Cc: Peng Fan <peng.fan at nxp.com>
Cc: Marek Vasut <marek.vasut+renesas at mailbox.org>
Cc: Alice Guo <alice.guo at nxp.com>
Cc: Quentin Schulz <quentin.schulz at cherry.de>
Cc: Ilias Apalodimas <ilias.apalodimas at linaro.org>
Cc: Neil Armstrong <neil.armstrong at linaro.org>
Cc: Mattijs Korpershoek <mkorpershoek at kernel.org>
Cc: Kuan-Wei Chiu <visitorckw at gmail.com>
Cc: Raymond Mao <raymond.mao at riscstar.com>
Cc: Stefan Roese <stefan.roese at mailbox.org>
Cc: Philip Molloy <philip.molloy at analog.com>
Cc: Jerome Forissier <jerome.forissier at arm.com>
Cc: Marek Vasut <marek.vasut at mailbox.org>
Cc: Varadarajan Narayanan <varadarajan.narayanan at oss.qualcomm.com>
Cc: Patrice Chotard <patrice.chotard at foss.st.com>
Cc: Aswin Murugan <aswin.murugan at oss.qualcomm.com>
Cc: Rasmus Villemoes <ravi at prevas.dk>
Cc: Heiko Schocher <hs at nabladev.com>
Cc: Michal Simek <michal.simek at amd.com>
Cc: Sughosh Ganu <sughosh.ganu at arm.com>
Cc: Antony Kurniawan Soemardi <linux at smankusors.com>
Cc: Luca Weiss <luca.weiss at fairphone.com>
Cc: Balaji Selvanathan <balaji.selvanathan at oss.qualcomm.com>

---
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)