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History

Hauke Mehrtens e167d9fbb8 bcma: scan for extra address space Some cores like the USB core have two address spaces. In the USB host controller one address space is used for the OHCI and the other for the EHCI controller interface. The USB controller is the only core I found with two address spaces. This code is based on the AI scan function ai_scan() in shared/aiutils.c in the Broadcom SDK. CC: Rafał Miłecki <zajec5@gmail.com> CC: linux-wireless@vger.kernel.org Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2012-04-18 13:43:13 -07:00
..
Kconfig	bcma: add mips driver	2011-08-08 14:29:26 -04:00
Makefile	bcma: add mips driver	2011-08-08 14:29:26 -04:00
README	bcma: add Broadcom specific AMBA bus driver	2011-05-10 15:54:54 -04:00
TODO	bcma: add Broadcom specific AMBA bus driver	2011-05-10 15:54:54 -04:00
bcma_private.h	bcma: add PCIe host controller	2012-02-06 14:53:04 -05:00
core.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_chipcommon_pmu.c	bcma: silence PMU warning for BCM4331	2012-03-07 13:56:37 -05:00
driver_mips.c	bcma: get CPU clock	2011-08-08 14:29:29 -04:00
driver_pci.c	bcma: add PCIe host controller	2012-02-06 14:53:04 -05:00
driver_pci_host.c	bcma: add PCIe host controller	2012-02-06 14:53:04 -05:00
host_pci.c	bcma: make some functions __devinit	2012-02-06 14:53:03 -05:00
host_soc.c	bcma: add SOC bus	2011-08-08 14:29:25 -04:00
main.c	bcma: export bcma_find_core	2012-03-05 15:20:50 -05:00
scan.c	bcma: scan for extra address space	2012-04-18 13:43:13 -07:00
scan.h	bcma: add Broadcom specific AMBA bus driver	2011-05-10 15:54:54 -04:00
sprom.c	bcma: add support for on-chip OTP memory used for SPROM storage	2012-03-06 15:16:18 -05:00

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.