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Diffstat (limited to 'Documentation/watchdog/mlx-wdt.txt')
-rw-r--r-- | Documentation/watchdog/mlx-wdt.txt | 52 |
1 files changed, 0 insertions, 52 deletions
diff --git a/Documentation/watchdog/mlx-wdt.txt b/Documentation/watchdog/mlx-wdt.txt deleted file mode 100644 index 66eeb78505c3..000000000000 --- a/Documentation/watchdog/mlx-wdt.txt +++ /dev/null @@ -1,52 +0,0 @@ - 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. |