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path: root/drivers/clocksource/sh_tmu.c
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2014-05-23Merge branch 'clockevents/cmt-mtu2-tmu-cleanups' into clockevents/3.16Daniel Lezcano
2014-05-23clocksource: sh_tmu: Remove unnecessary OOM messagesJingoo Han
The site-specific OOM messages are unnecessary, because they duplicate the MM subsystem generic OOM message. [dlezcano] : refreshed against latest modifications: kmalloc -> kzalloc Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2014-05-19clocksource: sh_tmu: Fix channel IRQ retrieval in legacy caseLaurent Pinchart
In the legacy platform data case each TMU platform device handles a single channel with a single IRQ for the platform device. Retrieve the IRQ using the logical channel number instead of the hardware channel number. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2014-04-16clocksource: sh_tmu: Sort headers alphabeticallyLaurent Pinchart
This helps locating duplicates and inserting new headers. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Remove FSF mail address from GPL noticeLaurent Pinchart
Do not include the paragraph about writing to the Free Software Foundation's mailing address from the sample GPL notice. The FSF has changed addresses in the past, and may do so again. Linux already includes a copy of the GPL. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Rename clock to "fck" in the non-legacy caseLaurent Pinchart
The sh_tmu driver gets the TMU functional clock using a connection ID of "tmu_fck". While all SH SoCs create clock lookup entries with a NULL device ID and a "tmu_fck" connection ID, the ARM SoCs use the device ID only with a NULL connection ID. This works on legacy platforms but will break on ARM with DT boot. Fix the situation by using a connection ID of "fck" in the non-legacy platform data case. Clock lookup entries will be renamed to use the device ID as well as the connection ID as platforms get moved to new platform data. The legacy code will eventually be dropped, leaving us with device ID based clock lookup, compatible with DT boot. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Add support for multiple channels per deviceLaurent Pinchart
TMU hardware devices can support multiple channels, with global registers and per-channel registers. The sh_tmu driver currently models the hardware with one Linux device per channel. This model makes it difficult to handle global registers in a clean way. Add support for a new model that uses one Linux device per timer with multiple channels per device. This requires changes to platform data, add new channel configuration fields. Support for the legacy model is kept and will be removed after all platforms switch to the new model. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Hardcode TMU clock event and source ratings to 200Laurent Pinchart
All boards use clock event and clock source ratings of 200 for the TMU, hardcode it in the driver. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Replace hardcoded register values with macrosLaurent Pinchart
Define symbolic macros for all used registers bits. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Allocate channels dynamicallyLaurent Pinchart
This prepares the driver for multi-channel support. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Replace kmalloc + memset with kzallocLaurent Pinchart
One kzalloc a day keeps the bugs away. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Add index to struct sh_tmu_channelLaurent Pinchart
Use the index as the timer start/stop bit and when printing messages to identify the channel. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Add memory base to sh_tmu_channel structureLaurent Pinchart
The channel memory base is channel-specific, add it to the channel structure in preparation for support of multiple channels per device. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Constify name argument to sh_tmu_register()Laurent Pinchart
The name argument is assigned to const structure fields only, constify it. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Split channel setup to separate functionLaurent Pinchart
Move the channel setup code from sh_tmu_setup to a new sh_tmu_setup_channel function and call it from sh_tmu_setup. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Rename struct sh_tmu_priv to sh_tmu_deviceLaurent Pinchart
Channel data is private as well, rename priv to device to make the distrinction between the core device and the channels clearer. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Split channel fields from sh_tmu_privLaurent Pinchart
Create a new sh_tmu_channel structure to hold the channel-specific field in preparation for multiple channels per device support. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-04-16clocksource: sh_tmu: Use request_irq() instead of setup_irq()Laurent Pinchart
The driver claims it needs to register an interrupt handler too early for request_irq(). This might have been true in the past, but the only meaningful difference between request_irq() and setup_irq() today is an additional kzalloc() call in request_irq(). As the driver calls kmalloc() itself we know that the slab allocator is available, we can thus switch to request_irq(). Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
2014-01-14Merge branch 'clockevents/3.14' of ↵Ingo Molnar
git://git.linaro.org/people/daniel.lezcano/linux into timers/core Pull clocksource/clockevent updates from Daniel Lezcano: * Axel Lin removed an unused structure defining the ids for the bcm kona driver. * Ezequiel Garcia enabled the timer divider only when the 25MHz timer is not used for the armada 370 XP. * Jingoo Han removed a pointless platform data initialization for the sh_mtu and sh_mtu2. * Laurent Pinchart added the clk_prepare/clk_unprepare for sh_cmt. * Linus Walleij added a useful warning in clk_of when no clocks are found while the old behavior was to silently hang at boot time. * Maxime Ripard added the high speed timer drivers for the Allwinner SoCs (A10, A13, A20). He increased the rating, shared the irq across all available cpus and fixed the clockevent's irq initialization for the sun4i. * Michael Opdenacker removed the usage of the IRQF_DISABLED for the all the timers driver located in drivers/clocksource. * Stephen Boyd switched to sched_clock_register for the arm_global_timer, cadence_ttc, sun4i and orion timers. Conflicts: drivers/clocksource/clksrc-of.c Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-12-11clocksource: misc drivers: Remove deprecated IRQF_DISABLEDMichael Opdenacker
This patch removes the use of the IRQF_DISABLED flag It's a NOOP since 2.6.35 and it will be removed one day. [dlezcano] : slightly changed the changelog Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2013-12-11clocksource: sh_tmu: Remove unnecessary platform_set_drvdata()Jingoo Han
The driver core clears the driver data to NULL after device_release or on probe failure. Thus, it is not needed to manually clear the device driver data to NULL. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2013-11-20clocksource: sh_tmu: Add clk_prepare/unprepare supportLaurent Pinchart
Prepare the clock at probe time, as there is no other appropriate place in the driver where we're allowed to sleep. Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2013-11-20clocksource: sh_tmu: Release clock when sh_tmu_register() failsLaurent Pinchart
Fix the probe error path to release the clock resource when the sh_tmu_register() call fails. Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2013-03-13clocksource: sh_tmu: Set initcall level to subsysSimon Horman
The reason for this is to ensure that TMU is probed earlier than with its previous initcall level, module init. This came up as a problem with using CMT as a clock source kzm9g-reference which does not make use of early timers or devices. In that scenario initialisation of SDHI and MMCIF both stall on msleep() calls due to the absence of a initialised clock source. The purpose of this change is to keep the TMU code in sync with the CMT code which has been modified in a similar manner.. Boot tested on: mackerel. Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
2013-01-03Drivers: clocksource: remove __dev* attributes.Greg Kroah-Hartman
CONFIG_HOTPLUG is going away as an option. As a result, the __dev* markings need to be removed. This change removes the use of __devinit, __devexit_p, __devinitdata, __devinitconst, and __devexit from these drivers. Based on patches originally written by Bill Pemberton, but redone by me in order to handle some of the coding style issues better, by hand. Cc: Bill Pemberton <wfp5p@virginia.edu> Cc: John Stultz <johnstul@us.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-04sh: TMU: Basic runtime PM supportRafael J. Wysocki
Modify the SH TMU clock source/clock event device driver to support runtime PM at a basic level (i.e. device clocks can be disabled and enabled, but domain power must be on, because the devices have to be marked as "irq safe"). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Magnus Damm <damm@opensource.se>
2012-09-04PM / Domains: Move syscore flag from subsys data to struct deviceRafael J. Wysocki
The syscore device PM flag is used to mark the devices (belonging to a PM domain) that should never be turned off, except for the system core (syscore) suspend/hibernation and resume stages. That flag is stored in the device's struct pm_subsys_data object whose address is available from struct device. However, in some situations it may be convenient to set that flag before the device is added to a PM domain, so it is better to move it directly to the "power" member of struct device. Then, it can be checked by the routines in drivers/base/power/runtime.c and drivers/base/power/main.c, which is more straightforward. This also reduces the number of dev_gpd_data() invocations in the generic PM domains framework, so the overhead related to the syscore flag is slightly smaller. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Magnus Damm <damm@opensource.se>
2012-09-04PM / Domains: Rename the always_on device flag to syscoreRafael J. Wysocki
The always_on device flag is used to mark the devices (belonging to a PM domain) that should never be turned off, except for the system core (syscore) suspend/hibernation and resume stages. Change name of that flag to "syscore" to better reflect its purpose. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Magnus Damm <damm@opensource.se>
2012-09-04sh: TMU: Introduce clocksource/clock events suspend/resume routinesRafael J. Wysocki
Introduce suspend/resume routines for SH TMU clock source and clock event device such that if those devices belong to a PM domain, the generic PM domains framework will be notified that the given domain may be turned off (during system suspend) or that it has to be turned on (during system resume). This change allows the A4R domain on SH7372 to be turned off during system suspend (tested on the Mackerel board) if the TMU clock source and/or clock event device is in use. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Magnus Damm <damm@opensource.se>
2012-06-11clocksource: sh_tmu: Use clockevents_config_and_register().Paul Mundt
This switches over to the now exported clockevents_config() and clockevents_config_and_register() helpers. This knocks off a long-standing TMU TODO item. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2012-06-11clocksource: sh_tmu: Convert timer lock to raw spinlock.Paul Mundt
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2012-03-16PM / shmobile: Make TMU driver use pm_genpd_dev_always_on()Rafael J. Wysocki
Make the TMU clocksource driver mark its device as "always on" using pm_genpd_dev_always_on() to protect it from surprise power removals and make sh7372_add_standard_devices() add TMU devices on sh7372 to the A4R power domain so that their "always on" flags are taken into account as appropriate. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Tested-by: Simon Horman <horms@verge.net.au> Acked-by: Paul Mundt <lethal@linux-sh.org> Cc: stable@vger.kernel.org
2011-10-31drivers/clocksource: Add module.h to those who were using it implicitlyPaul Gortmaker
A pending cleanup will mean that module.h won't be implicitly everywhere anymore. Make sure the modular drivers in clocksource are actually calling out for <module.h> explicitly in advance. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-05-31Revert "clocksource: sh_tmu: Runtime PM support"Paul Mundt
This reverts commit 1b842e91fea9447eff5eb687e28ad61c02f5033e. There is a fundamental ordering race between the early and late probe paths and the runtime PM tie-in that results in __pm_runtime_resume() attempting to take a lock that hasn't been initialized yet (which by proxy also suggests that pm_runtime_init() hasn't yet been run on the device either, making the entire thing unsafe) -- resulting in instant death on SMP or on UP with spinlock debugging enabled: sh_tmu.0: used for clock events sh_tmu.0: used for periodic clock events BUG: spinlock trylock failure on UP on CPU#0, swapper/0 lock: 804db198, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0 ... Revert it for now until the ordering issues can be resolved, or we can get some more help from the runtime PM framework to make this possible. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2011-05-23clocksource: sh_tmu: Runtime PM supportMagnus Damm
Add Runtime PM support to the TMU driver. The hardware device is enabled as long as the clocksource or the clockevent portion of the driver is used. Signed-off-by: Magnus Damm <damm@opensource.se> Acked-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2011-05-23clocksource: sh_tmu: __clocksource_updatefreq_hz() updateMagnus Damm
This patch updates the clocksource part of the TMU driver to make use of the __clocksource_updatefreq_hz() function. Without this patch the old code uses clocksource_register() together with a hack that assumes a never changing clock rate (see clk_enable(), clk_get_rate() and clk_disable()). The patch uses clocksource_register_hz() with 1 Hz as initial value, then lets the ->enable() callback update the value with __clocksource_updatefreq_hz() once the struct clk has been enabled and the frequency is stable. Signed-off-by: Magnus Damm <damm@opensource.se> Acked-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-10-31ARM: shmobile: remove sh_timer_config clk memberMagnus Damm
Now when the SH-Mobile ARM platforms have been converted to use device name it is possible to remove "clk" from struct sh_timer_config. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-06-02clocksource: sh_tmu: compute mult and shift before registrationAurelien Jarno
Since commit 98962465ed9e6ea99c38e0af63fe1dcb5a79dc25 ("nohz: Prevent clocksource wrapping during idle"), the CPU of an R2D board never goes to idle. This commit assumes that mult and shift are assigned before the clocksource is registered. As a consequence the safe maximum sleep time is negative and the CPU never goes into idle. This patch fixes the problem by moving mult and shift initialization from sh_tmu_clocksource_enable() to sh_tmu_register_clocksource(). Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Cc: stable@kernel.org Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-04-26Merge branch 'sh/stable-updates'Paul Mundt
Conflicts: arch/sh/kernel/dwarf.c drivers/dma/shdma.c Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-04-15sh: Disable IRQ balancing for timer and IPI IRQs.Paul Mundt
Make sure that the timer IRQs and IPIs aren't enabled for IRQ balancing. IPIs are disabled as a result of being percpu while the timers simply disable balancing outright. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-03-30include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo
implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-29clocksource: Deprecate clock string across the SH drivers.Paul Mundt
We want to get rid of the clock string from platform data entirely, depending on the clkdev-based clock lookup to do the right thing for us instead. This converts all of the SH drivers to request their associated function clocks directly, and if there is no match for that then we fall back on the legacy lookup while warning about it. After all of the outstanding CPUs have been converted to clkdev lookups the clock string will be killed off completely. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-03-10clocksource: Use dev_name() universally across the SH drivers.Paul Mundt
There is no need to copy in the name from the sh timer config now that dev_name() is available early. We prefer the dev_name() variant for consistent naming. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-02-25clocksource: Fix up a registration/IRQ race in the sh drivers.Paul Mundt
All of the SH clocksource drivers follow the scheme that the IRQ is setup prior to registering the clockevent. The interrupt handler in the clockevent cases looks to the event handler function pointer being filled in by the registration code, permitting us to get in to situations where asserted IRQs step in to the handler before registration has had a chance to complete and hitting a NULL pointer deref. In practice this is not an issue for most platforms, but some of them with fairly special loaders (or that are chain-loading from another kernel) may enter in to this situation. This fixes up the oops reported by Rafael on hp6xx. Reported-and-tested-by: Rafael Ignacio Zurita <rafaelignacio.zurita@gmail.com> Cc: stable@kernel.org Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-06-24clocksource: sh_tmu: Make undefined TCOR behaviour less undefined.Shin-ichiro KAWASAKI
Avoid undocumented vague TMU behavior when zero value is set to TCOR. This primarily fixes up issues encountered under qemu with a zero-length period, while the hardware itself is fairly ambivalent one way or the other. Signed-off-by: Shin-ichiro KAWASAKI <kawasaki@juno.dti.ne.jp> Acked-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-06-17sh: turn off irqs when disabling CMT/TMU timersMagnus Damm
Modify the CMT and TMU drivers to disable interrupts when disabling the timer. Only using start/stop bits is not enough. This fixes a bootup hang on Migo-R when the CMT is replaced by TMU for clockevents but the CMT keeps on delivering irqs even though the timer start bit is off. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-06-14clocksource: Drop unused irqaction.mask from SH drivers.Paul Mundt
The irqaction.mask is legacy code that is wholly unused and going away, so simply drop its use in the SH drivers completely. Fixes up build failures in -next. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-03sh: Consolidate MTU2/CMT/TMU timer platform data.Paul Mundt
All of the SH timers use a roughly identical structure for platform data, which presently is broken out for each block. Consolidate all of these definitions, as there is no reason for them to be broken out in the first place. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-03clocksource: SuperH TMU Timer driverMagnus Damm
This patch adds a TMU driver for the SuperH architecture. The TMU driver is a platform driver with early platform support to allow using a TMU channel as clockevent or clocksource during system bootup or later. Clocksource or clockevent can be selected. Both periodic and oneshot clockevents are supported. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>