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| author | Serge Semin <Sergey.Semin@baikalelectronics.ru> | 2020-05-26 15:59:27 +0300 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2020-05-28 14:16:29 +0200 |
| commit | 8f93662d8324940e8925a0e492c587dbcf7c7fee (patch) | |
| tree | 31e754944e1ed577dd8d5efaeb3e37b6050c868d /drivers/bus/Kconfig | |
| parent | 63cb77136e04ff24ca520e46f5ff57d351dadbdb (diff) | |
| download | linux-8f93662d8324940e8925a0e492c587dbcf7c7fee.tar.bz2 | |
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/20200526125928.17096-6-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Olof Johansson <olof@lixom.net>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: soc@kernel.org
Cc: devicetree@vger.kernel.org
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/bus/Kconfig')
| -rw-r--r-- | drivers/bus/Kconfig | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig index 1080dd26e268..030f0e59f193 100644 --- a/drivers/bus/Kconfig +++ b/drivers/bus/Kconfig @@ -29,6 +29,21 @@ config BRCMSTB_GISB_ARB arbiter. This driver provides timeout and target abort error handling and internal bus master decoding. +config BT1_APB + tristate "Baikal-T1 APB-bus driver" + depends on MIPS_BAIKAL_T1 || COMPILE_TEST + select REGMAP_MMIO + help + 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 of any APB protocol collisions, slave device + not responding on timeout an IRQ is raised with an erroneous address + reported to the APB terminator (APB Errors Handler Block). 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. + config BT1_AXI tristate "Baikal-T1 AXI-bus driver" depends on MIPS_BAIKAL_T1 || COMPILE_TEST |