| 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. |