Commit 57d2caaa authored by Fu Wei's avatar Fu Wei Committed by Wim Van Sebroeck

Watchdog: introduce ARM SBSA watchdog driver

According to Server Base System Architecture (SBSA) specification,
the SBSA Generic Watchdog has two stage timeouts: the first signal (WS0)
is for alerting the system by interrupt, the second one (WS1) is a real
hardware reset.
More details about the hardware specification of this device:
ARM DEN0029B - Server Base System Architecture (SBSA)

This driver can operate ARM SBSA Generic Watchdog as a single stage watchdog
or a two stages watchdog, it's set up by the module parameter "action".
In the single stage mode, when the timeout is reached, your system
will be reset by WS1. The first signal (WS0) is ignored.
In the two stages mode, when the timeout is reached, the first signal (WS0)
will trigger panic. If the system is getting into trouble and cannot be reset
by panic or restart properly by the kdump kernel(if supported), then the
second stage (as long as the first stage) will be reached, system will be
reset by WS1. This function can help administrator to backup the system
context info by panic console output or kdump.

This driver bases on linux kernel watchdog framework, so it can get
timeout from module parameter and FDT at the driver init stage.
Signed-off-by: default avatarFu Wei <fu.wei@linaro.org>
Reviewed-by: default avatarGraeme Gregory <graeme.gregory@linaro.org>
Tested-by: default avatarPratyush Anand <panand@redhat.com>
Acked-by: default avatarTimur Tabi <timur@codeaurora.org>
Reviewed-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 2fc94b5f
......@@ -202,6 +202,26 @@ config ARM_SP805_WATCHDOG
ARM Primecell SP805 Watchdog timer. This will reboot your system when
the timeout is reached.
config ARM_SBSA_WATCHDOG
tristate "ARM SBSA Generic Watchdog"
depends on ARM64
depends on ARM_ARCH_TIMER
select WATCHDOG_CORE
help
ARM SBSA Generic Watchdog has two stage timeouts:
the first signal (WS0) is for alerting the system by interrupt,
the second one (WS1) is a real hardware reset.
More details: ARM DEN0029B - Server Base System Architecture (SBSA)
This driver can operate ARM SBSA Generic Watchdog as a single stage
or a two stages watchdog, it depends on the module parameter "action".
Note: the maximum timeout in the two stages mode is half of that in
the single stage mode.
To compile this driver as module, choose M here: The module
will be called sbsa_gwdt.
config ASM9260_WATCHDOG
tristate "Alphascale ASM9260 watchdog"
depends on MACH_ASM9260
......
......@@ -30,6 +30,7 @@ obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o
# ARM Architecture
obj-$(CONFIG_ARM_SP805_WATCHDOG) += sp805_wdt.o
obj-$(CONFIG_ARM_SBSA_WATCHDOG) += sbsa_gwdt.o
obj-$(CONFIG_ASM9260_WATCHDOG) += asm9260_wdt.o
obj-$(CONFIG_AT91RM9200_WATCHDOG) += at91rm9200_wdt.o
obj-$(CONFIG_AT91SAM9X_WATCHDOG) += at91sam9_wdt.o
......
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