bus: Add Baikal-T1 APB-bus driver

Baikal-T1 AXI-APB bridge is used to access the SoC subsystem CSRs.
IO requests are routed to this bus by means of the DW AMBA 3 AXI
Interconnect. In case if an attempted APB transaction stays with no
response for a pre-defined time an interrupt occurs and the bus gets
freed for a next operation. This driver provides the interrupt handler
to detect the erroneous address, prints an error message about the
address fault, updates an errors counter. The counter and the APB-bus
operations timeout can be accessed via corresponding sysfs nodes.
A dedicated sysfs-node can be also used to artificially cause the
bus errors described above.

[arnd: fix build warnings for missing includes and wrong return types]

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Serge Semin <[email protected]>
Cc: Alexey Malahov <[email protected]>
Cc: Paul Burton <[email protected]>
Cc: Olof Johansson <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Reported-by: kbuild test robot <[email protected]>
Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

0 files changed, 0 insertions, 0 deletions