This series introduces support for the RPMh (Resource Power Manager (hardened)) co-processor and associated regulator driver found on most modern Qualcomm platforms (since ~2017).
Even though most regulators are controlled via SPMI, the specific regions on the PMICs for controlling the regulators are restricted and can't be accessed by the Applications Processor (AP/HLOS). Instead, these resources are proxied via the RPMh where they can be voted on by multiple subsystems (Linux, the modem, and the other DSPs). This is done for security (to protect clocks, power domains, and regulators that are specifically relevant for the trustzone) as well as to simplify the management of shared peripherals and to allow for handover of peripherals like the USB controller.
For U-Boot, our main concern is the regulators. Since all regulators on the system are controlled via the RPMh, it is necessary to support it to enable USB VBUS on some platforms, and may be needed for other peripherals in the future.
Communicating with the RPMh additional requires accessing the cmd-db shared memory region, this contains key/value maps to determine the address of specific resources on the RPMh.
Introduce support for the cmd-db, the RPMh framework, and some of the regulators that are necessary to enable USB VBUS on the RB5 development board.
These drivers are taken from Linux, then modified and simplified for U-Boot. The original Linux drivers contain heavy optimisations related to multithreading and asynchronous probing, as well as support for idle and suspend states which we don't need to deal with here. This unused code is removed before finally adjusting the drivers to properly build for U-Boot and use its device model.
The U-Boot version of the driver supports a single ACTIVE_ONLY TCS and waits for it to be cleared after use. We don't support programming low power states.
--- Changes in v5: - Add Kconfig / Makefiles after introducing drivers to avoid breaking compilation when bisecting (Thanks Neil). - Link to v4: https://lore.kernel.org/r/20240709-b4-qcom-rpmh-v4-0-c06d0a26644a@linaro.org
Changes in v4: - Denote original Linux version in bitmap.h patch - Rebased on Linux 6.10-rc6 and re-apply U-Boot changes preserving git history. Allowing for future changes to the Linux drivers to be ported over more easily. - Add missing check to wait for the TCS to be cleared after use (seems we were just racing the RPMh before, oops!). - Fix missing n_modes in pmic5_pldo regulator. - Link to v3: https://lore.kernel.org/r/20240708-b4-qcom-rpmh-v3-0-846cc6c5b728@linaro.org
Changes in v3: - Don't call dm_scan_fdt_dev(), since DM core will scan. - Link to v2: https://lore.kernel.org/r/20240708-b4-qcom-rpmh-v2-0-8bc765606e56@linaro.org
Changes in v2: - Implement Neil's suggestions and fixes for SM8[56]50 - Slightly refactor cmd_db_init() for better abstraction. - Improve logging (printf -> log_err/dev_err) - Add missing error check in rpmh_regulators_bind() - Link to v1: https://lore.kernel.org/r/20240617-b4-qcom-rpmh-v1-0-bd2336923e0a@linaro.org
--- Caleb Connolly (23): linux/bitmap.h: add bitmap_empty helper soc: qcom: import rpmh and cmd-db drivers from Linux soc: qcom: cmd-db: adjust headers for U-Boot soc: qcom: cmd-db: drop unused functions soc: qcom: cmd-db: replace cmd_db_ready() with cmd_db_init() soc: qcom: cmd-db: adjust for U-Boot API soc: qcom: rpmh-rsc: drop unused multi-threading and non-active TCS support soc: qcom: rpmh-rsc: adjust headers for U-Boot soc: qcom: rpmh-rsc: adjust probe for U-Boot soc: qcom: rpmh-rsc: remaining U-Boot API changes soc: qcom: rpmh: adjust headers for U-Boot soc: qcom: rpmh: drop unused functions soc: qcom: rpmh: U-Boot API changes soc: qcom: add build infrastructure power: regulator: import qcom-rpmh-regulator from Linux power: regulator: qcom-rpmh-regulator: adjust headers for U-Boot power: regulator: qcom-rpmh-regulator: port over lineage_range helpers power: regulator: qcom-rpmh-regulator: adjust structs for U-Boot power: regulator: qcom-rpmh-regulator: remove unused regulators power: regulator: qcom-rpmh-regulator: port ops to U-Boot power: regulator: qcom-rpmh-regulator: adjust probe for U-Boot power: regulator: qcom-rpmh-regulator: add build infra qcom_defconfig: enable rpmh regulators
configs/qcom_defconfig | 5 + drivers/power/regulator/Kconfig | 8 + drivers/power/regulator/Makefile | 1 + drivers/power/regulator/qcom-rpmh-regulator.c | 544 ++++++++++++++++++++++++++ drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/qcom/Kconfig | 27 ++ drivers/soc/qcom/Makefile | 4 + drivers/soc/qcom/cmd-db.c | 213 ++++++++++ drivers/soc/qcom/rpmh-internal.h | 138 +++++++ drivers/soc/qcom/rpmh-rsc.c | 518 ++++++++++++++++++++++++ drivers/soc/qcom/rpmh.c | 110 ++++++ include/linux/bitmap.h | 8 + include/soc/qcom/cmd-db.h | 33 ++ include/soc/qcom/rpmh.h | 28 ++ include/soc/qcom/tcs.h | 81 ++++ 16 files changed, 1720 insertions(+) --- change-id: 20240611-b4-qcom-rpmh-fcfd32ac2940 base-commit: 834df20b4ef50cda26936fbc435689fa0c5d47b1
// Caleb (they/them)