IO Drivers¶
The IO Drivers provide access to an IO HW Interfaces connected to the DSP, e.g. I2S, DMIC, etc. and are managed as a part of the Zephyr RTOS. The Audio IO Drivers share generic Zephyr DAI interface. For a full list of IO drivers available on the specific platform, refer to Platforms. HW IO is accessed via the Gateway interface inside the FW. The actual implementation of that interface depends on the underlying HW IO mechanism. Gateways use the Zephyr DMA interface to transmit the data to/from the represented HW IO. DMA interface implementation depends on the underlying DMA method (HDA-DMA, GPDMA, etc.).
NOTE: The introduction of Gateways concept to SOF with Zephyr is a work in progress. In existing implementation the SOF Host and DAI implementation is still in use as a substitute of Gateways.
Figure 74 IO Drivers diagram¶