Samsung S3C6400/S3C6410/S5P6440/S5PC100 Serial port support

modulename: s3c6400.ko

configname: CONFIG_SERIAL_S3C6400

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>Samsung S3C6400/S3C6410/S5P6440/S5PC100 Serial port support
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
Serial port support for the Samsung S3C6400, S3C6410, S5P6440
and S5PC100 SoCs

source code:
drivers/serial/s3c6400.c