On 13/09/21 02:06PM, Parshuram Thombare wrote: > This patch adds driver for Cadence's XSPI controller. > It supports 3 work modes. > 1. ACMD (auto command) work mode > ACMD name is because it uses auto command engine in the controller. > It further has 2 modes PIO and CDMA (command DMA). > The CDMA work mode is dedicated for high-performance application > where very low software overhead is required. In this mode the > Command Engine is programmed by the series of linked descriptors > stored in system memory. These descriptors provide commands to execute > and store status information for finished commands. > The PIO mode work mode is dedicated for single operation where > constructing a linked list of descriptors would require too > much effort. > 2. STIG (Software Triggered Instruction Generator) work mode > In STIG mode, controller sends low-level instructions to memory. > Each instruction is 128-bit width. There is special instruction > DataSequence which carries information about data phase. > Driver uses Slave DMA interface to transfer data as only this > interface can be used in STIG work mode. > 3. Direct work mode > This work mode allows sending data without invoking any command through > the slave interface. > Currently only STIG work mode is enabled, remaining work modes will > be added later. Acked-by: Pratyush Yadav <p.yadav@xxxxxx> -- Regards, Pratyush Yadav Texas Instruments Inc.
