linux

History

Paul Gortmaker 44a8e3772f bcma: fix implicit use of export.h contents Fix in advance, or we will get things like this: drivers/bcma/core.c:20: warning: data definition has no type or storage class drivers/bcma/core.c:20: warning: type defaults to 'int' in declaration of 'EXPORT_SYMBOL_GPL' drivers/bcma/core.c:20: warning: parameter names (without types) in function declaration Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>		2011-10-31 19:32:02 -04:00
..
bcma_private.h
core.c	bcma: fix implicit use of export.h contents	2011-10-31 19:32:02 -04:00
driver_chipcommon_pmu.c	bcma: fix implicit use of export.h contents	2011-10-31 19:32:02 -04:00
driver_chipcommon.c	bcma: fix implicit use of export.h contents	2011-10-31 19:32:02 -04:00
driver_mips.c
driver_pci_host.c
driver_pci.c	bcma: fix implicit use of export.h contents	2011-10-31 19:32:02 -04:00
host_pci.c	bcma: add module.h to the modular portions of this driver	2011-10-31 19:32:01 -04:00
host_soc.c
Kconfig
main.c	bcma: add module.h to the modular portions of this driver	2011-10-31 19:32:01 -04:00
Makefile
README
scan.c
scan.h
sprom.c	bcma: extract some basic info about board from SPROM	2011-09-13 15:42:30 -04:00
TODO

README

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.