John W. Linville 98b7ff9a49 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 12 years ago
..
Kconfig a733311413 bcma: BCMA_DRIVER_GPIO should depend on GPIOLIB instead of selecting it 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 fd5023111c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 12 years ago
core.c 1fd41a65f1 bcma: change delays to follow timers-howto guide 12 years ago
driver_chipcommon.c e2aa19fadd bcma: return the mips irq number in bcma_core_irq 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 dd4544f054 bgmac: driver for GBit MAC core on BCMA bus 12 years ago
driver_chipcommon_sflash.c 58b27101e1 bcma: Xflash: reorder includes to make pr_fmt work 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 73e4dbe4ca bcma: register platform device for parallel flash 12 years ago
driver_pci.c 0f58a01ddd Drivers: bcma: remove __dev* attributes. 12 years ago
driver_pci_host.c 98b7ff9a49 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 12 years ago
host_pci.c 0f58a01ddd Drivers: bcma: remove __dev* attributes. 12 years ago
host_soc.c 94f3457f4d bcma: make some functions static 13 years ago
main.c fd5023111c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 12 years ago
scan.c 9dbf5f55f8 bcma: add missing iounmap on error path 13 years ago
scan.h 97cfda8fec bcma: fix typo - reading number of slave wrappers 13 years ago
sprom.c 017c4c3bde bcma: use fallback sprom if sprom on card was not valid 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.