This site shares useful resources for PSoC users.
Many software developers are using MCU of various bends like PSoC of Cypress, ATmega of ATmel and PIC series of Micr0chip.
However it is very rare to provide the compatible driver and example for their MCU.
They are not sharing those information but providing to use for study materials in the school.
Below blog page is an excellent resource for whom using PSoC.
Not only W5500 driver but also porting work completed source are shown in this page.
The location of this source is https://github.com/e2forlife/PSoC-W5500-Example.git
The final version is not released because FreeRTOS Master Project is not been finalised yet but
writer is sharing ongoing version through his Github.
Please refer to below links for Source location.
Project page : https://github.com/e2forlife/PSoC-FreeRTOS
Page for the ongoing version : https://github.com/e2forlife/PSoC-FreeRTOS/tree/Implement-PSoC5
As appendix, information for W5100 related driver is shared in below links.