CONFIG_PCI_QSPAN is not available for thedefaultarchitecture x86.
Result is shown for architecture ppc

QSpan PCI

modulename: qspan_pci.ko

configname: CONFIG_PCI_QSPAN

Linux/PowerPC Kernel Configuration
└─>Bus options
└─>QSpan PCI
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
Say Y here if you have a system based on a Motorola 8xx-series
embedded processor with a QSPAN PCI interface, otherwise say N.

source code:
arch/ppc/syslib/qspan_pci.c