This adds a binding for the watchdog in Sigma Designs SMP8642 and
similar devices.
Signed-off-by: NMans Rullgard <mans@mansr.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

This adds support for the Sigma Designs SMP86xx/SMP87xx family built-in
watchdog.
Signed-off-by: NMans Rullgard <mans@mansr.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

This patchs adds documentation for the binding of the Zodiac RAVE
Switch Watchdog Processor. This is an i2c based watchdog.

Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: NMartyn Welch <martyn.welch@collabora.co.uk>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

This patch adds a driver for the Zodiac Aerospace RAVE Watchdog Procesor.
This device implements a watchdog timer, accessible over I2C.
Signed-off-by: NMartyn Welch <martyn.welch@collabora.co.uk>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Signed-off-by: NOleksij Rempel <linux@rempel-privat.de>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Add WD support for Alphascale asm9260 SoC. This driver
provide support for different function modes:
- HW mode to trigger SoC reset on timeout
- SW mode do soft reset if needed
- DEBUG mode
Signed-off-by: NOleksij Rempel <linux@rempel-privat.de>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

This watchdog is instantiated in a FPGA that is memory mapped. It is
made of only one register, called the feed register. Writing to this
register will re-arm the watchdog for a given time (and enable it if it
was disable). It can be disabled by writing a special value into it.

It is part of a syscon block, and the watchdog register offset in this
block varies from board to board. This offset is passed in the syscon
property after the phandle to the syscon node.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

This patch adds watchdog driver for CSRatlas7 platform.
On CSRatlas7, the 6th timer can act as a watchdog timer
when the Watchdog mode is enabled.
Signed-off-by: NGuo Zeng <Guo.Zeng@csr.com>
Signed-off-by: NWilliam Wang <William.Wang@csr.com>
Signed-off-by: NBarry Song <Baohua.Song@csr.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Add SoC specific data in the watchdog driver for the meson8b SoC.
Signed-off-by: NCarlo Caione <carlo@endlessm.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

With this patch we refactor the driver code to enable watchdog support
for all platforms based on Amlogic meson SoCs.
The new default timeout is also now chosen considering the maximum
timeout allowed by the SoC.
Signed-off-by: NCarlo Caione <carlo@endlessm.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

This patch is for the rebranding changes for the corporate split at HP.
There are no functional changes with this patch.
Signed-off-by: NTom Mingarelli <thomas.mingarelli@hpe.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Use to_platform_device() instead of open-coding it.
Signed-off-by: NGeliang Tang <geliangtang@163.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

With the early_enable module parameter the watchdog can be started
during driver probe time. If this is requested the bets are good that
the timer is already running, so to narrow the gap where the timer is
disabled only call the disable function when the timer shouldn't be
started.
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

omap_wdt_start calls pm_runtime_get_sync so dropping a reference just
before calling omap_wdt_start doesn't make much sense. Moreover there is
no point to use the synchronous variant of pm_runtime_put because the
driver doesn't care if the clock is disabled before or after
omap_wdt_probe returns.
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

On 64bit platforms, "(1 << (16 + top)) / clk_get_rate(dw_wdt.clk)" is
sign-extended to 64bit then converted to unsigned 64bit, finally divide
the clk rate. If the top is the maximum TOP i.e 15, "(1 << (16 +15))"
will be sign-extended to 0xffffffff80000000, then converted to unsigned
0xffffffff80000000, which is a huge number, thus the final result is
wrong.

We fix this issue by giving usigned value(1U in this case) at first.

Let's assume clk rate is 25MHZ,
Before the patch:
dw_wdt_top_in_seconds(15) = -864612050

After the patch:
dw_wdt_top_in_seconds(15) = 85
Signed-off-by: NJisheng Zhang <jszhang@marvell.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

the softdog has static variables which are accessed if its timer is
still running after the driver is unloaded. and lead to crash:

   $modprobe softdog
   $echo 1 >/dev/watchdog
   $modprobe -r softdog

   CPU 20 Unable to handle kernel paging request at virtual address
   Oops[#1]:
   CPU: 20 PID: 0 Comm: swapper/20 Not tainted 4.1.13-WR8.0.0.0_standard
   ...
   Modules linked in: [last unloaded: softdog]
    ....
   Call Trace:
   [<ffffffff801e142c>] cascade+0x34/0xb0
   [<ffffffff801e1964>] run_timer_softirq+0x30c/0x368
   [<ffffffff80181044>] __do_softirq+0x1ec/0x418
   [<ffffffff801815d0>] irq_exit+0x90/0x98
   [<ffffffff8010749c>] plat_irq_dispatch+0xa4/0x140
   [<ffffffff80152740>] ret_from_irq+0x0/0x4
   [<ffffffff801529e0>] __r4k_wait+0x20/0x40
   [<ffffffff801c2278>] cpu_startup_entry+0x2a0/0x368
   [<ffffffff8015fa64>] start_secondary+0x444/0x4d8

add the module ref when timer is running to avoid to unload the softdog
module
Signed-off-by: NLi RongQing <roy.qing.li@gmail.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

This allows the system to actually halt even if userspace forgot to
disable the watchdog first. Old behaviour was that the watchdog forced
the system to boot again.
Signed-off-by: NHarald Geyer <harald@ccbib.org>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

For SB800 and later chipsets, the register definitions are the same
with SB800. And for SB700 and older chipsets, the definitions should
be same with SP5100/SB7x0.
Signed-off-by: NHuang Rui <ray.huang@amd.com>
Cc: Denis Turischev <denis.turischev@compulab.co.il>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

sp5100_tco watchdog is also supported on AMD KernCZ chipset of Carrizo
platform.
Signed-off-by: NHuang Rui <ray.huang@amd.com>
Cc: Denis Turischev <denis.turischev@compulab.co.il>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

AMD Mullins watchdog is fully compatible to the previous Hudson chipset,
reuse the existent sp5100_tco driver.
Signed-off-by: NDenis Turischev <denis.turischev@compulab.co.il>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

This patch adds following attributes to watchdog device's sysfs interface
to read its different status.

* state - reads whether device is active or not
* identity - reads Watchdog device's identity string.
* timeout - reads current timeout.
* timeleft - reads timeleft before watchdog generates a reset
* bootstatus - reads status of the watchdog device at boot
* status - reads watchdog device's  internal status bits
* nowayout - reads whether nowayout feature was set or not

Testing with iTCO_wdt:
 # cd /sys/class/watchdog/watchdog1/
 # ls
bootstatus  dev  device  identity  nowayout  power  state
subsystem  timeleft  timeout  uevent
 # cat identity
iTCO_wdt
 # cat timeout
30
 # cat state
inactive
 # echo > /dev/watchdog1
 # cat timeleft
26
 # cat state
active
 # cat bootstatus
0
 # cat nowayout
0
Signed-off-by: NPratyush Anand <panand@redhat.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

We need few sysfs attributes to know different status of a watchdog device.
To do that, we need to associate .dev_groups with watchdog_class. So
convert it from pointer to static.
Putting this static struct in watchdog_dev.c, so that static device
attributes defined in that file can be attached to it.
Signed-off-by: NPratyush Anand <panand@redhat.com>
Suggested-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom reboot notifier block registration and use the one
provided by the watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirlinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom reboot notifier block registration and use the one
provided by the watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirlinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom reboot notifier block registration and use the one
provided by the watchdog core.

Note that this watchdog used to stop unconditionnaly on SYS_HALT and
SYS_POWER_OFF. The core function now calls ops->stop on SYS_HALT and
SYS_DOWN. To prevent the watchdog from being stopped on reboot, the
"always-running" property must be set, otherwise it will now be stopped.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirlinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom reboot notifier block registration and use the one
provided by the watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirlinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom reboot notifier block registration and use the one
provided by the watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirlinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Many watchdog drivers register a reboot notifier in order to stop the
watchdog on system reboot. Thus we can factorize this code in the
watchdog core.

For that purpose, a new notifier block is added in watchdog_device for
internal use only, as well as a new watchdog_stop_on_reboot helper
function.

If this helper is called, watchdog core registers the related notifier
block and will stop the watchdog when SYS_HALT or SYS_DOWN is received.

Since this operation can be critical on some platforms, abort the device
registration if the reboot notifier registration fails.
Suggested-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Get rid of the custom restart handler by using the one provided by the
watchdog core.
Signed-off-by: NDamien Riegel <damien.riegel@savoirfairelinux.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>