OpenCloudOS-Kernel

History

Nathan Hintz 044e68c0cd bcma: Add flush for BCMA_RESET_CTL write Adds a missing read to flush the previous write (per the Broadcom SDK). Signed-off-by: Nathan Hintz <nlhintz@hotmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>		2012-05-16 12:46:04 -04:00
..
Kconfig	bcma: fix build error on MIPS; implicit pcibios_enable_device	2012-04-10 14:13:30 -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: Add flush for BCMA_RESET_CTL write	2012-05-16 12:46:04 -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 bcma_core_pci_config_fixup()	2012-05-16 12:45:22 -04:00
driver_pci_host.c	bcma: reads/writes are always 4 bytes, so always map 4 bytes	2012-05-16 12:46:04 -04:00
host_pci.c	bcma: Add __devexit to bcma_host_pci_remove	2012-05-16 12:46:04 -04:00
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: Find names of non BCM cores	2012-05-16 12:45:26 -04:00
scan.h	bcma: add Broadcom specific AMBA bus driver	2011-05-10 15:54:54 -04:00
sprom.c	bcma/ssb: parse new attributes from sprom	2012-05-16 12:45:22 -04:00

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.