[PATCH v2 10/16] switchtec_ntb: initialize hardware for doorbells and messages

Set up some hardware registers and creates interrupt service routines for the doorbells and messages. There are 64 doorbells in the switch that are shared between all partitions. The upper 4 doorbells are also shared with the messages and are there for not used. Thus, this provides 28 doorbells

[PATCH v2 10/16] switchtec_ntb: initialize hardware for doorbells and messages

Set up some hardware registers and creates interrupt service routines for the doorbells and messages. There are 64 doorbells in the switch that are shared between all partitions. The upper 4 doorbells are also shared with the messages and are there for not used. Thus, this provides 28 doorbells