CONFIG_S3C_DMA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S3C_DMA (not configurable)

modulename: dma.ko

configname: CONFIG_S3C_DMA

Linux Kernel Configuration
└─>S3C_DMA
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
Internal configuration for S3C DMA core

source code:
depends
CONFIG_PLAT_S3C

is depended by
CONFIG_S3C24XX_DMA