On your T4 you either have your RPP on Box 20 which you can claim as a deduction on line 20700. Box 52 is your employer contribution added with yours and you report it for information purposes only on line 20600.
If you have any other benefits paid by your employer in Box 40, it will be included in your income Box 14.
Any other RRSP contributions would be reported on a separate slip if you want to claim the deduction on line 20800.
I hope this was helpful