hello,
the code document page for the BV4618 is
here.
There was also a bit bang I2C interface
(zip file here)
I have written an interface that can be compiled as follows:
gcc –o i2cbb bcm2835_i2cbb.c bcm2835.c
and can be run: sudo ./i2cbb
This is an alternative I2C written for user space but it does go at 100kHz and can be used on any pin.
I don't think I have any more bits of code.