This driver is for 2.4 series kernels. If you are looking for Intel RAID metadata support in a 2.6 series kernel, it is provided by dmraid. Here is a link to one of the announcements from its author.
If you are looking for a FreeBSD driver supporting Intel RAID metadata, here is a link to it.
Documentation about this driver is included with its releases, in file Documentation/iswraid.txt.
Everything related to this driver is best found from
summary page. For example, there have been some
file releases, the project does use the CVS
services where you can find the latest and best
released source code
and there are
where no question is considered too dumb (and at the same time an
excerpt from the kernel log showing iswraid startup and the contents of
/proc/iswraid/* files, if available, are expected).
A few more links to related software and patches: