I do not happen to have any current idea how to get the software you might need, other than suggesting that if you have a login account to `My Oracle Support`it could be available over there, but ...
While using Google for this, I came across a cached copy of the SRC/P Raid Controller Installation Guide. While viewing it on screen, I was able to select a menu choice while in Google Docs that let me "Print-to-PDF". My browser settings always launch that in an other browser window, but the save-to-disk icon was there in that new PDF window.
First, sorry for the late return. All my Solaris installation media was packed away in storage.
To begin with, I do not happen to have any Solaris-for-SPARC media, but only CD/DVD media for installation to x86. None of it happens to have any obvious packages for the SRC/P card. I looked through my various releases of Solaris 7, 8, 9, Sol-Express, and 10.
< insert sad face emoticon here >
They're now all packed away again.
... and yes, you will most probably need a MOS login to get access to the drivers. The speediest way for anyone would be for them to log a support request and have tech support dig out a copy.