S3C24XX driver with FIQ pseudo-DMA

configname: CONFIG_SPI_S3C24XX_FIQ

Linux Kernel Configuration
└─> Device Drivers
└─> SPI support
└─> S3C24XX driver with FIQ pseudo-DMA

In linux kernel since version 2.6.33 (release Date: 2010-02-24)  

Enable FIQ support for the S3C24XX SPI driver to provide pseudo
DMA by using the fast-interrupt request framework, This allows
the driver to get DMA-like performance when there are either
no free DMA channels, or when doing transfers that required both
TX and RX data paths.