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  1. 05 Jun, 2017 2 commits
  3. 24 Feb, 2017 3 commits
  5. 16 Dec, 2016 1 commit
  7. 08 Oct, 2016 3 commits
  9. 24 Sep, 2016 1 commit
    • Mika Westerberg's avatar
      ACPI / watchdog: Add support for WDAT hardware watchdog · 058dfc76
      Mika Westerberg authored 
      Starting from Intel Skylake the iTCO watchdog timer registers were moved to
reside in the same register space with SMBus host controller.  Not all
needed registers are available though and we need to unhide P2SB (Primary
to Sideband) device briefly to be able to read status of required NO_REBOOT
bit. The i2c-i801.c SMBus driver used to handle this and creation of the
iTCO watchdog platform device.

Windows, on the other hand, does not use the iTCO watchdog hardware
directly even if it is available. Instead it relies on ACPI Watchdog Action
Table (WDAT) table to describe the watchdog hardware to the OS. This table
contains necessary information about the the hardware and also set of
actions which are executed by a driver as needed.

This patch implements a new watchdog driver that takes advantage of the
ACPI WDAT table. We split the functionality into two parts: first part
enumerates the WDAT table and if found, populates resources and creates
platform device for the actual driver. The second part is the driver
itself.

The reason for the split is that this way we can make the driver itself to
be a module and loaded automatically if the WDAT table is found. Otherwise
the module is not loaded.
Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      058dfc76
  11. 17 Jul, 2016 3 commits
  13. 14 May, 2016 1 commit
  15. 13 May, 2016 2 commits
  17. 16 Mar, 2016 1 commit
    • Fu Wei's avatar
      Watchdog: introduce ARM SBSA watchdog driver · 57d2caaa
      Fu Wei authored 
      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>
      57d2caaa
  19. 01 Mar, 2016 2 commits
  21. 07 Feb, 2016 1 commit
  23. 31 Jan, 2016 1 commit
  25. 09 Jan, 2016 1 commit
  27. 28 Dec, 2015 5 commits
  29. 27 Oct, 2015 1 commit
  31. 09 Sep, 2015 2 commits
    • Wenyou Yang's avatar
      watchdog: add a driver to support SAMA5D4 watchdog timer · 76534860
      Wenyou Yang authored 
      From SAMA5D4, the watchdog timer is upgrated with a new feature,
which is describled as in the datasheet, "WDT_MR can be written
until a LOCKMR command is issued in WDT_CR".
That is to say, as long as the bootstrap and u-boot don't issue
a LOCKMR command, WDT_MR can be written more than once in the driver.

So the SAMA5D4 watchdog driver's implementation is different from
the at91sam9260 watchdog driver implemented in file at91sam9_wdt.c.
The user application open the device file to enable the watchdog timer
hardware, and close to disable it, and set the watchdog timer timeout
by seting WDV and WDD fields of WDT_MR register, and ping the watchdog
by issuing WDRSTT command to WDT_CR register with hard-coded key.
Signed-off-by: default avatarWenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
      76534860
    • Ariel D'Alessandro's avatar
      watchdog: NXP LPC18xx Watchdog Timer Driver · 7c25f8c9
      Ariel D'Alessandro authored 
      This commit adds support for the watchdog timer found in NXP LPC SoCs
family, which includes LPC18xx/LPC43xx. Other SoCs in that family may
share the same watchdog hardware.

Watchdog driver registers a restart handler that will restart the system
by performing an incorrect feed after ensuring the watchdog is enabled in
reset mode.

As watchdog cannot be disabled in hardware, driver's stop routine will
regularly send a keepalive ping using a timer.
Signed-off-by: default avatarAriel D'Alessandro <ariel@vanguardiasur.com.ar>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
      7c25f8c9
  33. 22 Jun, 2015 3 commits
  35. 30 Apr, 2015 1 commit
  37. 17 Feb, 2015 2 commits
  39. 20 Oct, 2014 4 commits
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