linux_dsm_epyc7002/drivers/bcma
Rafał Miłecki 28e7d218da bcma: invalidate the mapped core over suspend/resume
This clears the currently mapped core when suspending, to force
re-mapping after resume. Without that we were touching default core
registers believing some other core is mapped. Such a behaviour
resulted in lockups on some machines.

Cc: stable@vger.kernel.org
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2012-01-16 15:01:15 -05:00
..
bcma_private.h bcma: support for suspend and resume 2011-12-13 15:33:30 -05:00
core.c bcma: fix implicit use of export.h contents 2011-10-31 19:32:02 -04:00
driver_chipcommon_pmu.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_mips.c bcma: get CPU clock 2011-08-08 14:29:29 -04:00
driver_pci_host.c bcma: detect PCI core working in hostmode 2011-07-07 13:13:34 -04:00
driver_pci.c bcma: fix implicit use of export.h contents 2011-10-31 19:32:02 -04:00
host_pci.c bcma: invalidate the mapped core over suspend/resume 2012-01-16 15:01:15 -05:00
host_soc.c bcma: add SOC bus 2011-08-08 14:29:25 -04:00
Kconfig bcma: add mips driver 2011-08-08 14:29:26 -04:00
main.c bcma: support for suspend and resume 2011-12-13 15:33:30 -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: signedness bug in bcma_get_next_core() 2011-08-24 14:41:44 -04:00
scan.h bcma: add Broadcom specific AMBA bus driver 2011-05-10 15:54:54 -04:00
sprom.c bcma: extract revision and TX power IDs from SPROM 2011-12-13 15:47:41 -05:00
TODO bcma: add Broadcom specific AMBA bus driver 2011-05-10 15:54:54 -04:00

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.