The UFS 2.1 Host Stack is a stack developed for UFS Host Controllers that are used to connect to UFS devices via UniPro/M-PHY. The stack can also be used for validating a UFS device during its development and integration life cycles thereby helping designers to reduce the time to market for their product.
The modular UFS 2.1 Host Stack is architected to be OS and platform independent which eases porting effort. It has thin OS and hardware abstraction layers making it highly portable.
The UFS 2.1 Host Stack has a low-level hardware layer that is purely OS independent and users can use this layer alone for UFS host/device validation with no driver complexity. The UFS stack provides a generic API set to access, control, and configure the bus driver, host controller driver, and the underlying hardware. The stack includes functions for UFS initialization, UniPro attributes configuration, sending/Receiving of commands/tasks in the form of UPIUs, data transfer, UFS interrupt handling, UFS device configuration, and UFS host controller hardware configuration. The UFS 2.1 Host Stack can support a single UFS host controller with a single UFS Device.
The UFS host stack consists of the following layers:
- a) Application Interface Layer (API Layer)
- b) Protocol Layer
- c) Host Controller Driver Layer
- d) Low level Hardware Abstraction Layer
- e) OS Abstraction Layer
The layered architecture allows for easy porting to various operating systems and various platforms. Client applications such as the function drivers interface with the API layer to use the UFS device. The low level details of the protocol is abstracted for the end-user and is handled in the software stack. A set of well defined APIs are provided at this layer.
