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path: root/drivers/watchdog/sp805_wdt.c
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2020-04-08watchdog: sp805: fix restart handlerMichael Walle1-0/+4
The restart handler is missing two things, first, the registers has to be unlocked and second there is no synchronization for the write_relaxed() calls. This was tested on a custom board with the NXP LS1028A SoC. Fixes: 6c5c0d48b686c ("watchdog: sp805: add restart handler") Signed-off-by: Michael Walle <michael@walle.cc> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20200327162450.28506-1-michael@walle.cc Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
2019-07-08watchdog: sp805_wdt: drop warning after registering deviceWolfram Sang1-4/+1
The core will print out details now. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
2018-08-06watchdog: sp805: Add clock-frequency propertySrinath Mannam1-10/+25
Use clock-frequency property given in _DSD object of ACPI device to calculate Watchdog rate as binding clock devices are not available as device tree. Note: There is no formal review process for _DSD properties Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Ray Jui <ray.jui@broadcom.com> Reviewed-by: Scott Branden <scott.branden@broadcom.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
2018-08-02watchdog: sp805: set WDOG_HW_RUNNING when appropriateRay Jui1-0/+19
If the watchdog hardware is already enabled during the boot process, when the Linux watchdog driver loads, it should reset the watchdog and tell the watchdog framework. As a result, ping can be generated from the watchdog framework, until the userspace watchdog daemon takes over control Signed-off-by: Ray Jui <ray.jui@broadcom.com> Reviewed-by: Vladimir Olovyannikov <vladimir.olovyannikov@broadcom.com> Reviewed-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
2018-08-02watchdog: sp805: add 'timeout-sec' DT property supportRay Jui1-1/+8
Add support for optional devicetree property 'timeout-sec'. 'timeout-sec' is used in the driver if specified in devicetree. Otherwise, fall back to driver default, i.e., 60 seconds Signed-off-by: Ray Jui <ray.jui@broadcom.com> Reviewed-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
2018-05-21watchdog: sp805: add restart handlerJongsung Kim1-0/+14
Add restart handler for SP805 watchdog so that the driver can be used to reboot the system. Signed-off-by: Jongsung Kim <neidhard.kim@lge.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2017-09-09watchdog: sp805: constify amba_idArvind Yadav1-1/+1
amba_id are not supposed to change at runtime. All functions working with const amba_id. So mark the non-const structs as const. Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2016-01-31watchdog: sp805: ping fails to abort wdt resetSandeep Tripathy1-3/+2
sp805 wdt asserts interrupt for the first expiry and reloads the counter. If wdt interrupt is set and count reaches zero then wdt reset event is generated. To get wdt reset at 't' timeout the driver loads wdt counter with 't/2'. A ping before time 't' *should* prevent wdt reset. Currently if ping is done after 't/2' then wdt interrupt condition gets set. On the next countdown of loadval wdt reset event occurs eventhough wdt was reloaded before the set timeout 't'. This patch clears the interrupt condition on ping. Signed-off-by: Sandeep Tripathy <tripathy@broadcom.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2015-09-09Watchdog: Fix parent of watchdog_devicesPratyush Anand1-0/+1
/sys/class/watchdog/watchdogn/device/modalias can help to identify the driver/module for a given watchdog node. However, many wdt devices do not set their parent and so, we do not see an entry for device in sysfs for such devices. This patch fixes parent of watchdog_device so that /sys/class/watchdog/watchdogn/device is populated. Exceptions: booke, diag288, octeon, softdog and w83627hf -- They do not have any parent. Not sure, how we can identify driver for these devices. Signed-off-by: Pratyush Anand <panand@redhat.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Acked-by: Guenter Roeck <linux@roeck-us.net> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Lubomir Rintel <lkundrak@v3.sk> Acked-by: Maxime Coquelin <maxime.coquelin@st.com> Acked-by: Thierry Reding <treding@nvidia.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2015-07-18Update Viresh Kumar's email addressViresh Kumar1-2/+2
Switch to my kernel.org alias instead of a badly named gmail address, which I rarely use. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-10watchdog: sp805: Set watchdog_device->timeout from ->set_timeout()Viresh Kumar1-3/+1
Implementation of ->set_timeout() is supposed to set 'timeout' field of 'struct watchdog_device' passed to it. sp805 was rather setting this in a local variable. Fix it. Reported-by: Arun Ramamurthy <arun.ramamurthy@broadcom.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be> Cc: <stable@vger.kernel.org> # 2.6.36+
2014-03-31watchdog: sp805_wdt: Use devm_ioremap_resource()Jingoo Han1-14/+3
Use devm_ioremap_resource() in order to make the code simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2014-03-31watchdog: Remove unnecessary OOM messagesJingoo Han1-1/+0
The site-specific OOM messages are unnecessary, because they duplicate the MM subsystem generic OOM message. For example, k.alloc and v.alloc failures use dump_stack(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Reviewed-by: Jean Delvare <jdelvare@suse.de> [for at32ap700x] Acked-by: Lubomir Rintel <lkundrak@v3.sk> [for bcm2835] Acked-by: Viresh Kumar <viresh.kumar@linaro.org> [for sp805_wdt] Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> [for ts72xx_wdt] Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2014-03-31watchdog: delete non-required instances of include <linux/init.h>Paul Gortmaker1-1/+0
None of these files are actually using any __init type directives and hence don't need to include <linux/init.h>. Most are just a left over from __devinit and __cpuinit removal, or simply due to code getting copied from one driver to the next. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be> Cc: linux-watchdog@vger.kernel.org
2013-11-17watchdog: sp805_wdt: Remove unnecessary amba_set_drvdata()Michal Simek1-1/+0
Driver core clears the driver data to NULL after device_release or on probe failure, so just remove it from here. Driver core change: "device-core: Ensure drvdata = NULL when no driver is bound" (sha1: 0998d0631001288a5974afc0b2a5f568bcdecb4d) Signed-off-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2013-07-11watchdog: sp805_wdt: use devm_clk_get()Jingoo Han1-5/+2
Use devm_clk_get() to make cleanup paths more simple. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2012-12-20watchdog: sp805_wdt.c: use clk_prepare_enable and clk_disable_unprepareJulia Lawall1-9/+2
Clk_prepare_enable and clk_disable_unprepare combine clk_prepare and clk_enable, and clk_disable and clk_unprepare. They make the code more concise, and ensure that clk_unprepare is called when clk_enable fails. A simplified version of the semantic patch that introduces calls to these functions is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression e; @@ - clk_prepare(e); - clk_enable(e); + clk_prepare_enable(e); @@ expression e; @@ - clk_disable(e); - clk_unprepare(e); + clk_disable_unprepare(e); // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2012-12-12Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-armLinus Torvalds1-4/+2
Pull ARM updates from Russell King: "Here's the updates for ARM for this merge window, which cover quite a variety of areas. There's a bunch of patch series from Will tackling various bugs like the PROT_NONE handling, ASID allocation, cluster boot protocol and ASID TLB tagging updates. We move to a build-time sorted exception table rather than doing the sorting at run-time, add support for the secure computing filter, and some updates to the perf code. We also have sorted out the placement of some headers, fixed some build warnings, fixed some hotplug problems with the per-cpu TWD code." * 'for-linus' of git://git.linaro.org/people/rmk/linux-arm: (73 commits) ARM: 7594/1: Add .smp entry for REALVIEW_EB ARM: 7599/1: head: Remove boot-time HYP mode check for v5 and below ARM: 7598/1: net: bpf_jit_32: fix sp-relative load/stores offsets. ARM: 7595/1: syscall: rework ordering in syscall_trace_exit ARM: 7596/1: mmci: replace readsl/writesl with ioread32_rep/iowrite32_rep ARM: 7597/1: net: bpf_jit_32: fix kzalloc gfp/size mismatch. ARM: 7593/1: nommu: do not enable DCACHE_WORD_ACCESS when !CONFIG_MMU ARM: 7592/1: nommu: prevent generation of kernel unaligned memory accesses ARM: 7591/1: nommu: Enable the strict alignment (CR_A) bit only if ARCH < v6 ARM: 7590/1: /proc/interrupts: limit the display of IPIs to online CPUs only ARM: 7587/1: implement optimized percpu variable access ARM: 7589/1: integrator: pass the lm resource to amba ARM: 7588/1: amba: create a resource parent registrator ARM: 7582/2: rename kvm_seq to vmalloc_seq so to avoid confusion with KVM ARM: 7585/1: kernel: fix nr_cpu_ids check in DT logical map init ARM: 7584/1: perf: fix link error when CONFIG_HW_PERF_EVENTS is not selected ARM: gic: use a private mapping for CPU target interfaces ARM: kernel: add logical mappings look-up ARM: kernel: add cpu logical map DT init in setup_arch ARM: kernel: add device tree init map function ...
2012-11-29watchdog: remove use of __devexitBill Pemberton1-1/+1
CONFIG_HOTPLUG is going away as an option so __devexit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Cc: Wim Van Sebroeck <wim@iguana.be> Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Kukjin Kim <kgene.kim@samsung.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-29watchdog: remove use of __devinitBill Pemberton1-1/+1
CONFIG_HOTPLUG is going away as an option so __devinit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Cc: Wim Van Sebroeck <wim@iguana.be> Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Kukjin Kim <kgene.kim@samsung.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-29watchdog: remove use of __devexit_pBill Pemberton1-1/+1
CONFIG_HOTPLUG is going away as an option so __devexit_p is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Cc: Wim Van Sebroeck <wim@iguana.be> Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Kukjin Kim <kgene.kim@samsung.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-08WATCHDOG: fix build PM warningsRussell King1-4/+2
drivers/watchdog/sp805_wdt.c:288:12: warning: 'sp805_wdt_suspend' defined but not used drivers/watchdog/sp805_wdt.c:298:12: warning: 'sp805_wdt_resume' defined but not used This is caused by the wrong config symbol being used for these functions. Rather than fixing that, mark the functions with __maybe_unused Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-06-21Viresh has movedViresh Kumar1-2/+2
viresh.kumar@st.com email-id doesn't exist anymore as I have left the company. Replace ST's id with viresh.linux@gmail.com. It also updates .mailmap file to fix address for 'git shortlog' Signed-off-by: Viresh Kumar <viresh.linux@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-30watchdog: sp805_wdt: Add clk_{un}prepare supportViresh Kumar1-0/+8
clk_{un}prepare() routines are required for required on some platforms to run part of clk enable/disable() routines from contexts that can schedule. This patch adds support for these routines in sp805 driver. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2012-05-30watchdog: sp805_wdt: convert to watchdog coreViresh Kumar1-159/+82
This patch converts existing sp805 watchdog driver to use already in place common infrastructure present in watchdog core. With this lot of code goes away. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2012-03-27watchdog: sp805: Use devm routinesViresh Kumar1-22/+13
sp805 driver currently uses normal kzalloc, ioremap, etc routines. This patch replaces these routines with devm_kzalloc and devm_request_mem_region etc, so that we don't need to handle freeing of resources for error cases and module removal routine. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2012-03-27watchdog: sp805: replace readl/writel with lighter _relaxed variantsViresh Kumar1-12/+12
readl/writel versions for ARM contain memory barrier instruction for synchronizing DMA buffers. These are not required at least on this module. So use lighter _relaxed variants. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2012-03-27watchdog: sp805: Fix documentation style commentViresh Kumar1-8/+7
@ was missing before variables names, in their description. Also adev is mentioned as dev in comment. Fix both these issues. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2012-03-27watchdog: nowayout is boolWim Van Sebroeck1-2/+2
nowayout is actually a boolean value. So make it bool for all watchdog device drivers. Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2012-03-27watchdog: sp805_wdt: add pm callbacks to support standby/S2R/hibernationViresh Kumar1-0/+33
Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2012-03-17ARM: 7362/1: AMBA: Add module_amba_driver() helper macro for amba_driverviresh kumar1-11/+1
For simple modules that contain a single amba_driver without any additional setup code then ends up being a block of duplicated boilerplate. This patch adds a new macro, module_amba_driver(), which replaces the module_init()/module_exit() registrations with template functions. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-01-07Merge branch 'amba-modalias' of ↵Linus Torvalds1-0/+2
git://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm * 'amba-modalias' of git://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm: sound: aaci: Enable module alias autogeneration for AMBA drivers watchdog: sp805: Enable module alias autogeneration for AMBA drivers fbdev: amba: Enable module alias autogeneration for AMBA drivers serial: pl011: Enable module alias autogeneration for AMBA drivers serial: pl010: Enable module alias autogeneration for AMBA drivers spi: pl022: Enable module alias autogeneration for AMBA drivers rtc: pl031: Enable module alias autogeneration for AMBA drivers rtc: pl030: Enable module alias autogeneration for AMBA drivers mmc: mmci: Enable module alias autogeneration for AMBA drivers input: ambakmi: Enable module alias autogeneration for AMBA drivers gpio: pl061: Enable module alias autogeneration for AMBA drivers dmaengine: pl330: Enable module alias autogeneration for AMBA drivers dmaengine: pl08x: Enable module alias autogeneration for AMBA drivers hwrng: nomadik: Enable module alias autogeneration for AMBA drivers ARM: amba: Auto-generate AMBA driver module aliases during modpost ARM: amba: Move definition of struct amba_id to mod_devicetable.h
2011-12-26watchdog: sp805: Fix section mismatch in ID table.Nick Bowler1-1/+1
The AMBA ID table is marked as __initdata, yet it is referenced by the driver struct which is not. This causes a (somewhat unhelpful) section mismatch warning: WARNING: drivers/watchdog/sp805_wdt.o(.data+0x4c): Section mismatch in reference from the variable sp805_wdt_driver to the (unknown reference) .init.data:(unknown) Fix this by removing the annotation. Signed-off-by: Nick Bowler <nbowler@elliptictech.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-11-22watchdog: sp805: Enable module alias autogeneration for AMBA driversDave Martin1-0/+2
Signed-off-by: Dave Martin <dave.martin@linaro.org>
2011-07-27watchdog: sp805: Flush posted writes in enable/disable.Nick Bowler1-0/+4
There are no reads in these functions, so if MMIO writes are posted, the writes in enable/disable may not have completed by the time these functions return. If the functions run from different CPUs, it's in theory possible for the writes to be interleaved, which would be disastrous for this driver. At the very least, we need an mmiowb() before releasing the lock, but since it seems desirable for the watchdog timer to be actually stopped or reset when these functions return, read the lock register to force the writes out. Signed-off-by: Nick Bowler <nbowler@elliptictech.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-07-27watchdog: sp805: Don't write 0 to the load value register.Nick Bowler1-1/+0
At least on the Versatile Express' V2M, calling wdt_disable followed by wdt_enable, for instance by running the following sequence: echo V > /dev/watchdog; echo V > /dev/watchdog results in an immediate reset. The wdt_disable function writes 0 to the load register; while the watchdog interrupts are disabled at this point, this special value is defined to trigger an interrupt immediately. It appears that in this instance, the reset happens when the interrupts are subsequently enabled by wdt_enable. Putting in a short delay after writing a new load value in wdt_enable solves the issue, but it seems cleaner to simply never write 0 to the load register at all: according to the hardware docs, writing 0 to the control register suffices to stop the counter, and the write of 0 to the load register is questionable anyway since this register resets to 0xffffffff. Signed-off-by: Nick Bowler <nbowler@elliptictech.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-03-31Fix common misspellingsLucas De Marchi1-1/+1
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-02-23ARM: amba: make probe() functions take const id tablesRussell King1-1/+1
Make Primecell driver probe functions take a const pointer to their ID tables. Drivers should never modify their ID tables in their probe handler. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-08-08watchdog: Adding support for ARM Primecell SP805 WatchdogViresh KUMAR1-0/+387
Technical Reference Manual can be found at: http://infocenter.arm.com/help/topic/com.arm.doc.ddi0270b/DDI0270.pdf Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
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