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