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4795f09609
linux_dsm_epyc7002/drivers/bcma
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Hauke Mehrtens 4795f09609 bcma: add mdelay bcma_pmu_resources_init() 
This is based on code from brcmsmac.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2012-07-09 16:36:07 -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_pmu.c bcma: add mdelay bcma_pmu_resources_init() 2012-07-09 16:36:07 -04:00
driver_chipcommon.c bcma: fix implicit use of export.h contents 2011-10-31 19:32:02 -04:00
driver_mips.c bcma: add constants for chip ids 2012-07-09 16:36:03 -04:00
driver_pci_host.c bcma: add constants for chip ids 2012-07-09 16:36:03 -04:00
driver_pci.c bcma: fix null pointer in bcma_core_pci_irq_ctl 2012-06-08 13:47:07 -04:00
host_pci.c bcma: add PCI ID for BCM43224 2012-07-09 16:36:04 -04:00
host_soc.c bcma: add SOC bus 2011-08-08 14:29:25 -04:00
Kconfig bcma: fix build error on MIPS; implicit pcibios_enable_device 2012-04-10 14:13:30 -04:00
main.c bcma: export bcma_find_core 2012-03-05 15:20:50 -05:00
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
scan.c bcma: define some additional cores IDs 2012-06-27 15:23:16 -04:00
scan.h bcma: add Broadcom specific AMBA bus driver 2011-05-10 15:54:54 -04:00
sprom.c bcma: add constants for chip ids 2012-07-09 16:36:03 -04:00
TODO bcma: add Broadcom specific AMBA bus driver 2011-05-10 15:54:54 -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.