From: Peng Fan <peng.fan@xxxxxxx> V11: - Minor update: Replace arg_smccc64/32 with unsigned long arg_smccc[]; Hope this version is ok for everyone. V10: - Add R-b tag from Andre, Rob and Florian - Two minor fixes - Drop "are passed from consumers" in patch 1/2 per Andre's comments - Drop interrupts.h in patch 2/2 per Andre's comments V9: - Add Florian's R-b tag in patch 1/2 - Mark arm,func-id as a required property per Andre's comments in patch 1/2. - Make invoke_smc_mbox_fn as a private entry in a channal per Florian's comments in pach 2/2 - Include linux/types.h in arm-smccc-mbox.h in patch 2/2 - Drop function_id from arm_smccc_mbox_cmd since func-id is from DT in patch 2/2/. V8: Add missed arm-smccc-mbox.h V7: Typo fix #mbox-cells changed to 0 Add a new header file arm-smccc-mbox.h Use ARM_SMCCC_IS_64 Andre, The function_id is still kept in arm_smccc_mbox_cmd, because arm,func-id property is optional, so clients could pass function_id to mbox driver. V6: Switch to per-channel a mbox controller Drop arm,num-chans, transports, method Add arm,hvc-mbox compatible Fix smc/hvc args, drop client id and use correct type. https://patchwork.kernel.org/cover/11146641/ V5: yaml fix https://patchwork.kernel.org/cover/11117741/ V4: yaml fix for num-chans in patch 1/2. https://patchwork.kernel.org/cover/11116521/ V3: Drop interrupt Introduce transports for mem/reg usage Add chan-id for mem usage Convert to yaml format https://patchwork.kernel.org/cover/11043541/ V2: This is a modified version from Andre Przywara's patch series https://lore.kernel.org/patchwork/cover/812997/. The modification are mostly: Introduce arm,num-chans Introduce arm_smccc_mbox_cmd txdone_poll and txdone_irq are both set to false arm,func-ids are kept, but as an optional property. Rewords SCPI to SCMI, because I am trying SCMI over SMC, not SCPI. Introduce interrupts notification. [1] is a draft implementation of i.MX8MM SCMI ATF implementation that use smc as mailbox, power/clk is included, but only part of clk has been implemented to work with hardware, power domain only supports get name for now. The traditional Linux mailbox mechanism uses some kind of dedicated hardware IP to signal a condition to some other processing unit, typically a dedicated management processor. This mailbox feature is used for instance by the SCMI protocol to signal a request for some action to be taken by the management processor. However some SoCs does not have a dedicated management core to provide those services. In order to service TEE and to avoid linux shutdown power and clock that used by TEE, need let firmware to handle power and clock, the firmware here is ARM Trusted Firmware that could also run SCMI service. The existing SCMI implementation uses a rather flexible shared memory region to communicate commands and their parameters, it still requires a mailbox to actually trigger the action. This patch series provides a Linux mailbox compatible service which uses smc calls to invoke firmware code, for instance taking care of SCMI requests. The actual requests are still communicated using the standard SCMI way of shared memory regions, but a dedicated mailbox hardware IP can be replaced via this new driver. This simple driver uses the architected SMC calling convention to trigger firmware services, also allows for using "HVC" calls to call into hypervisors or firmware layers running in the EL2 exception level. Patch 1 contains the device tree binding documentation, patch 2 introduces the actual mailbox driver. Please note that this driver just provides a generic mailbox mechanism, It could support synchronous TX/RX, or synchronous TX with asynchronous RX. And while providing SCMI services was the reason for this exercise, this driver is in no way bound to this use case, but can be used generically where the OS wants to signal a mailbox condition to firmware or a hypervisor. Also the driver is in no way meant to replace any existing firmware interface, but actually to complement existing interfaces. [1] https://github.com/MrVan/arm-trusted-firmware/tree/scmi Peng Fan (2): dt-bindings: mailbox: add binding doc for the ARM SMC/HVC mailbox mailbox: introduce ARM SMC based mailbox .../devicetree/bindings/mailbox/arm-smc.yaml | 96 +++++++++++++ drivers/mailbox/Kconfig | 7 + drivers/mailbox/Makefile | 2 + drivers/mailbox/arm-smc-mailbox.c | 156 +++++++++++++++++++++ include/linux/mailbox/arm-smccc-mbox.h | 17 +++ 5 files changed, 278 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/arm-smc.yaml create mode 100644 drivers/mailbox/arm-smc-mailbox.c create mode 100644 include/linux/mailbox/arm-smccc-mbox.h -- 2.16.4
