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- Mellanox watchdog drivers
- for x86 based system switches
-
-This driver provides watchdog functionality for various Mellanox
-Ethernet and Infiniband switch systems.
-
-Mellanox watchdog device is implemented in a programmable logic device.
-
-There are 2 types of HW watchdog implementations.
-
-Type 1:
-Actual HW timeout can be defined as a power of 2 msec.
-e.g. timeout 20 sec will be rounded up to 32768 msec.
-The maximum timeout period is 32 sec (32768 msec.),
-Get time-left isn't supported
-
-Type 2:
-Actual HW timeout is defined in sec. and it's the same as
-a user-defined timeout.
-Maximum timeout is 255 sec.
-Get time-left is supported.
-
-Type 1 HW watchdog implementation exist in old systems and
-all new systems have type 2 HW watchdog.
-Two types of HW implementation have also different register map.
-
-Mellanox system can have 2 watchdogs: main and auxiliary.
-Main and auxiliary watchdog devices can be enabled together
-on the same system.
-There are several actions that can be defined in the watchdog:
-system reset, start fans on full speed and increase register counter.
-The last 2 actions are performed without a system reset.
-Actions without reset are provided for auxiliary watchdog device,
-which is optional.
-Watchdog can be started during a probe, in this case it will be
-pinged by watchdog core before watchdog device will be opened by
-user space application.
-Watchdog can be initialised in nowayout way, i.e. oncse started
-it can't be stopped.
-
-This mlx-wdt driver supports both HW watchdog implementations.
-
-Watchdog driver is probed from the common mlx_platform driver.
-Mlx_platform driver provides an appropriate set of registers for
-Mellanox watchdog device, identity name (mlx-wdt-main or mlx-wdt-aux),
-initial timeout, performed action in expiration and configuration flags.
-watchdog configuration flags: nowayout and start_at_boot, hw watchdog
-version - type1 or type2.
-The driver checks during initialization if the previous system reset
-was done by the watchdog. If yes, it makes a notification about this event.
-
-Access to HW registers is performed through a generic regmap interface.