CONFIG_CSRC_IOASIC is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_CSRC_IOASIC (not configurable)

modulename: csrc-ioasic.ko

configname: CONFIG_CSRC_IOASIC

Linux/MIPS Kernel Configuration
└─>CSRC_IOASIC
In linux kernel since version 2.6.26 (release Date: 2008-07-13)  
source code:
arch/mips/kernel/csrc-ioasic.c