John W. Linville 9f96da4dd2 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 11 years ago
..
Kconfig 6ffdead802 bcma: make it possible to select SoC support without mips 12 years ago
Makefile cf0936b06d bcma: add GPIO driver 12 years ago
README 8369ae33b7 bcma: add Broadcom specific AMBA bus driver 14 years ago
TODO 8369ae33b7 bcma: add Broadcom specific AMBA bus driver 14 years ago
bcma_private.h 88f9b65d44 bcma: add support for BCM43142 12 years ago
core.c 972da7ec49 bcma: update core (en|dis)abling functions 12 years ago
driver_chipcommon.c 88f9b65d44 bcma: add support for BCM43142 12 years ago
driver_chipcommon_nflash.c f5237f278f Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 12 years ago
driver_chipcommon_pmu.c 88f9b65d44 bcma: add support for BCM43142 12 years ago
driver_chipcommon_sflash.c 4a71053ec5 bcma: use const for serial flash hardware table 12 years ago
driver_gmac_cmn.c 0f58a01ddd Drivers: bcma: remove __dev* attributes. 12 years ago
driver_gpio.c fd5023111c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 12 years ago
driver_mips.c f1faa69d8b bcma_mips: add a const qualifier 12 years ago
driver_pci.c 2bedea8f26 bcma: make bcma_core_pci_{up,down}() callable from atomic context 11 years ago
driver_pci_host.c f4a83e578e bcma: change max PCI read request size to 128 12 years ago
host_pci.c b9f54bd03f bcma: add PCI id 0x4313 11 years ago
host_soc.c 94f3457f4d bcma: make some functions static 13 years ago
main.c 1cabf7dba5 bcma: return correct error code when bus scan failed 12 years ago
scan.c aaa2ced15a bcma: fix error code handling on 64 Bit systems 12 years ago
scan.h 97cfda8fec bcma: fix typo - reading number of slave wrappers 13 years ago
sprom.c 88f9b65d44 bcma: add support for BCM43142 12 years ago

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.