0001 Broadcom introduced new bus as replacement for older SSB. It is based on AMBA,
0002 however from programming point of view there is nothing AMBA specific we use.
0003
0004 Standard AMBA drivers are platform specific, have hardcoded addresses and use
0005 AMBA standard fields like CID and PID.
0006
0007 In case of Broadcom's cards every device consists of:
0008 1) Broadcom specific AMBA device. It is put on AMBA bus, but can not be treated
0009 as standard AMBA device. Reading it's CID or PID can cause machine lockup.
0010 2) AMBA standard devices called ports or wrappers. They have CIDs (AMBA_CID)
0011 and PIDs (0x103BB369), but we do not use that info for anything. One of that
0012 devices is used for managing Broadcom specific core.
0013
0014 Addresses of AMBA devices are not hardcoded in driver and have to be read from
0015 EPROM.
0016
0017 In this situation we decided to introduce separated bus. It can contain up to
0018 16 devices identified by Broadcom specific fields: manufacturer, id, revision
0019 and class.
