This device interface to your 89S52 would be very similar to the code used to read/write a SPI type serial eeprom such as the 93C46. You could search the web with Google to find code samples for SPI type drivers.

Here are some links I turned up for one such search result:
http://jelmer.vernstok.nl/oss/at89p...89prog.pdf
http://www.pjrc.com/tech/8051/serial-eeprom.html

Michael Karas