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path: root/drivers/pwm/pwm-tiehrpwm.c
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2015-07-20pwm: Add the pwm_is_enabled() helperBoris Brezillon1-3/+3
Some PWM drivers are testing the PWMF_ENABLED flag. Create a helper function to hide the logic behind enabled test. This will allow us to smoothly move from the current approach to an atomic PWM update approach. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-10-20pwm: drop owner assignment from platform_driversWolfram Sang1-1/+0
A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-05-21pwm: tiehrpwm: inline accessor functionsWolfram Sang1-2/+2
These elementary functions should be inlined for fastest access. Also fixes this warning as a side-effect (when no PM_SLEEP is selected): drivers/pwm/pwm-tiehrpwm.c:141:12: warning: 'ehrpwm_read' defined but not used [-Wunused-function] Signed-off-by: Wolfram Sang <wsa@sang-engineering.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-21pwm: tiehrpwm: don't build PM related functions when not neededWolfram Sang1-1/+1
Fixes following warnings on AM335X with no PM_SLEEP drivers/pwm/pwm-tiehrpwm.c:534:13: warning: 'ehrpwm_pwm_save_context' defined but not used [-Wunused-function] drivers/pwm/pwm-tiehrpwm.c:548:13: warning: 'ehrpwm_pwm_restore_context' defined but not used [-Wunused-function] Signed-off-by: Wolfram Sang <wsa@sang-engineering.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28pwm: tiehrpwm: Remove unnecessary OOM messagesJingoo Han1-3/+1
The site-specific OOM messages are unnecessary, because they duplicate the MM subsystem generic OOM message. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-20pwm: tiehrpwm: use dev_err() instead of pr_err()Jingoo Han1-2/+2
Use dev_err() instead of pr_err() to provide a better message to userspace. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-10-15pwm: don't use devm_pinctrl_get_select_default() in probeWolfram Sang1-6/+0
Since commit ab78029 (drivers/pinctrl: grab default handles from device core), we can rely on device core for setting the default pins. Compile tested only. Acked-by: Linus Walleij <linus.walleij@linaro.org> (personally at LCE13) Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-09-03pwm: tiehrpwm: add missing __iomem annotationJingoo Han1-3/+3
Fix the following sparse warnings: drivers/pwm/pwm-tiehrpwm.c:144:16: warning: incorrect type in argument 1 (different address spaces) drivers/pwm/pwm-tiehrpwm.c:144:16: expected void const volatile [noderef] <asn:2>*addr drivers/pwm/pwm-tiehrpwm.c:144:16: got void * drivers/pwm/pwm-tiehrpwm.c:149:9: warning: incorrect type in argument 2 (different address spaces) drivers/pwm/pwm-tiehrpwm.c:149:9: expected void volatile [noderef] <asn:2>*addr drivers/pwm/pwm-tiehrpwm.c:149:9: got void * drivers/pwm/pwm-tiehrpwm.c:157:18: warning: incorrect type in argument 1 (different address spaces) drivers/pwm/pwm-tiehrpwm.c:157:18: expected void const volatile [noderef] <asn:2>*addr drivers/pwm/pwm-tiehrpwm.c:157:18: got void * drivers/pwm/pwm-tiehrpwm.c:160:9: warning: incorrect type in argument 2 (different address spaces) drivers/pwm/pwm-tiehrpwm.c:160:9: expected void volatile [noderef] <asn:2>*addr drivers/pwm/pwm-tiehrpwm.c:160:9: got void * Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-27pwm: pwm-tiehrpwm: Use clk_enable/disable instead clk_prepare/unprepare.Marek Belisko1-2/+11
This was found when using pwm-led on am33xx and enable heartbeat trigger. [ 808.624876] ================================= [ 808.629443] [ INFO: inconsistent lock state ] [ 808.634021] 3.9.0 #2 Not tainted [ 808.637415] --------------------------------- [ 808.641981] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 808.648288] swapper/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 808.653494] (prepare_lock){+.?.+.}, at: [<c027c211>] clk_unprepare+0x15/0x24 [ 808.661040] {SOFTIRQ-ON-W} state was registered at: [ 808.666155] [<c004ec4d>] __lock_acquire+0x411/0x824 [ 808.671465] [<c004f359>] lock_acquire+0x41/0x50 [ 808.676412] [<c039ee9d>] mutex_lock_nested+0x31/0x1d8 [ 808.681912] [<c027c275>] clk_prepare+0x15/0x28 [ 808.686764] [<c0590c6b>] _init+0x117/0x1e0 [ 808.691256] [<c0019ef9>] omap_hwmod_for_each+0x29/0x3c [ 808.696842] [<c0591107>] __omap_hwmod_setup_all+0x17/0x2c [ 808.702696] [<c0008653>] do_one_initcall+0xc3/0x10c [ 808.708017] [<c058a627>] kernel_init_freeable+0xa7/0x134 [ 808.713778] [<c039a543>] kernel_init+0x7/0x98 [ 808.718544] [<c000cd95>] ret_from_fork+0x11/0x3c [ 808.723583] irq event stamp: 1379172 [ 808.727328] hardirqs last enabled at (1379172): [<c03a0759>] _raw_spin_unlock_irqrestore+0x21/0x30 [ 808.736828] hardirqs last disabled at (1379171): [<c03a03c3>] _raw_spin_lock_irqsave+0x13/0x38 [ 808.745876] softirqs last enabled at (1379164): [<c002ae5d>] irq_enter+0x49/0x4c [ 808.753747] softirqs last disabled at (1379165): [<c002aec3>] irq_exit+0x63/0x88 [ 808.761518] [ 808.761518] other info that might help us debug this: [ 808.768373] Possible unsafe locking scenario: [ 808.768373] [ 808.774578] CPU0 [ 808.777141] ---- [ 808.779705] lock(prepare_lock); [ 808.783186] <Interrupt> [ 808.785929] lock(prepare_lock); [ 808.789595] [ 808.789595] *** DEADLOCK *** [ 808.789595] [ 808.795805] 1 lock held by swapper/0: [ 808.799643] #0: (((&heartbeat_data->timer))){+.-...}, at: [<c002e204>] call_timer_fn+0x0/0x90 [ 808.808814] [ 808.808814] stack backtrace: [ 808.813402] [<c000ff19>] (unwind_backtrace+0x1/0x98) from [<c039bd75>] (print_usage_bug.part.25+0x16d/0x1cc) [ 808.823721] [<c039bd75>] (print_usage_bug.part.25+0x16d/0x1cc) from [<c004e595>] (mark_lock+0x18d/0x434) [ 808.833669] [<c004e595>] (mark_lock+0x18d/0x434) from [<c004ec1d>] (__lock_acquire+0x3e1/0x824) [ 808.842803] [<c004ec1d>] (__lock_acquire+0x3e1/0x824) from [<c004f359>] (lock_acquire+0x41/0x50) [ 808.852031] [<c004f359>] (lock_acquire+0x41/0x50) from [<c039ee9d>] (mutex_lock_nested+0x31/0x1d8) [ 808.861433] [<c039ee9d>] (mutex_lock_nested+0x31/0x1d8) from [<c027c211>] (clk_unprepare+0x15/0x24) [ 808.870930] [<c027c211>] (clk_unprepare+0x15/0x24) from [<c019f7bf>] (ehrpwm_pwm_disable+0x5f/0x80) [ 808.880431] [<c019f7bf>] (ehrpwm_pwm_disable+0x5f/0x80) from [<c019f29f>] (pwm_disable+0x27/0x28) [ 808.889751] [<c019f29f>] (pwm_disable+0x27/0x28) from [<c026f8f3>] (led_heartbeat_function+0x3f/0xb0) [ 808.899431] [<c026f8f3>] (led_heartbeat_function+0x3f/0xb0) from [<c002e249>] (call_timer_fn+0x45/0x90) [ 808.909288] [<c002e249>] (call_timer_fn+0x45/0x90) from [<c002e399>] (run_timer_softirq+0x105/0x17c) [ 808.918884] [<c002e399>] (run_timer_softirq+0x105/0x17c) from [<c002abc5>] (__do_softirq+0xa5/0x150) [ 808.928486] [<c002abc5>] (__do_softirq+0xa5/0x150) from [<c002aec3>] (irq_exit+0x63/0x88) [ 808.937098] [<c002aec3>] (irq_exit+0x63/0x88) from [<c000d599>] (handle_IRQ+0x21/0x54) [ 808.945415] [<c000d599>] (handle_IRQ+0x21/0x54) from [<c0008495>] (omap3_intc_handle_irq+0x5d/0x68) [ 808.954900] [<c0008495>] (omap3_intc_handle_irq+0x5d/0x68) from [<c000c7ff>] (__irq_svc+0x3f/0x64) [ 808.964287] Exception stack(0xc05b1f68 to 0xc05b1fb0) [ 808.969587] 1f60: 00000001 00000001 00000000 00000000 c05b0000 c0619748 [ 808.978158] 1f80: c05b0000 c05b0000 c0619748 413fc082 00000000 00000000 01000000 c05b1fb0 [ 808.986719] 1fa0: c004f989 c000d6f0 400f0033 ffffffff [ 808.992024] [<c000c7ff>] (__irq_svc+0x3f/0x64) from [<c000d6f0>] (cpu_idle+0x60/0x98) [ 809.000250] [<c000d6f0>] (cpu_idle+0x60/0x98) from [<c058a535>] (start_kernel+0x1e9/0x234) Remove non atomic clk api calls and use only atomic for enable/disable because can be called from atomic context (led_heartbeat_function is timer callback). Signed-off-by: Marek Belisko <marek.belisko@streamunlimited.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-05-18drivers/pwm: don't check resource with devm_ioremap_resourceWolfram Sang1-5/+0
devm_ioremap_resource does sanity checks on the given resource. No need to duplicate this in the driver. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Stephen Warren <swarren@nvidia.com>
2013-03-26pwm: tiehrpwm: Staticize non-exported symbolsAxel Lin1-2/+2
Both ehrpwm_pwm_save_context() and ehrpwm_pwm_restore_context() are only used in this file, make them static. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-03-11pwm: pwm-tiehrpwm: add CONFIG_PM_SLEEP to suspend/resume functionsJingoo Han1-0/+2
This patch adds CONFIG_PM_SLEEP to suspend/resume functions to fix the following build warning when CONFIG_PM_SLEEP is not selected. drivers/pwm/pwm-tiehrpwm.c:562:12: warning: 'ehrpwm_pwm_suspend' defined but not used [-Wunused-function] drivers/pwm/pwm-tiehrpwm.c:580:12: warning: 'ehrpwm_pwm_resume' defined but not used [-Wunused-function Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-02-26Merge tag 'for-3.9-rc1' of git://gitorious.org/linux-pwm/linux-pwmLinus Torvalds1-2/+91
Pull PWM changes from Thierry Reding: "A new driver has been added to support the PWM mode of the timer counter blocks found on Atmel AT91 SoCs. The VT8500 driver now supports changing the PWM signal polarity and the TI drivers (EHRPWM and ECAP) gained suspend and resume functionality. User drivers can now query the core for whether access to a PWM device will sleep (if the PWM chip is on a slow bus such as I2C or SPI). The pwm-backlight driver now handles the backlight BL_CORE_FBBLANK state in addition to the FB layer's blanking states. To round things off, a few fixes and cleanups are also included" * tag 'for-3.9-rc1' of git://gitorious.org/linux-pwm/linux-pwm: pwm: twl: Use to_twl() instead of container_of() pwm: tegra: assume CONFIG_OF pwm_backlight: Validate dft_brightness in main probe function pwm: Export pwm_{set,get}_chip_data() pwm: Make Kconfig entries more consistent pwm: Add can_sleep property to drivers pwm: Add pwm_can_sleep() as exported API to users pwm-backlight: handle BL_CORE_FBBLANK state pwm: pwm-tiecap: Low power sleep support pwm: pwm-tiehrpwm: Low power sleep support pwm: pwm-tiehrpwm: Update the clock handling of pwm-tiehrpwm driver pwm: vt8500: Add polarity support pwm: vt8500: Register write busy test performed incorrectly pwm: atmel: add Timer Counter Block PWM driver
2013-01-22pwm: Convert to devm_ioremap_resource()Thierry Reding1-3/+3
Convert all uses of devm_request_and_ioremap() to the newly introduced devm_ioremap_resource() which provides more consistent error handling. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17pwm: pwm-tiehrpwm: Low power sleep supportPhilip Avinash1-0/+83
In low power modes of AM33XX platforms, peripherals power is cut off. This patch supports low power sleep transition support for EHRPWM driver. Signed-off-by: Philip Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-14pwm: pwm-tiehrpwm: Update the clock handling of pwm-tiehrpwm driverPhilip, Avinash1-2/+8
The clock framework has changed and it's now better to invoke clock_prepare_enable() and clk_disable_unprepare() rather than the legacy clk_enable() and clk_disable() calls. This patch converts the pwm-tiehrpwm driver to the new framework. Signed-off-by: Philip Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-12-19Merge tag 'for-3.8-rc1' of git://gitorious.org/linux-pwm/linux-pwmLinus Torvalds1-1/+61
Pull pwm changes from Thierry Reding: "A new driver has been added for the SPEAr platform and the TWL4030/6030 driver has been replaced by two drivers that control the regular PWMs and the PWM driven LEDs provided by the chips. The vt8500, tiecap, tiehrpwm, i.MX, LPC32xx and Samsung drivers have all been improved and the device tree bindings now support the PWM signal polarity." Fix up trivial conflicts due to __devinit/exit removal. * tag 'for-3.8-rc1' of git://gitorious.org/linux-pwm/linux-pwm: (21 commits) pwm: samsung: add missing s3c->pwm_id assignment pwm: lpc32xx: Set the chip base for dynamic allocation pwm: lpc32xx: Properly disable the clock on device removal pwm: lpc32xx: Fix the PWM polarity pwm: i.MX: eliminate build warning pwm: Export of_pwm_xlate_with_flags() pwm: Remove pwm-twl6030 driver pwm: New driver to support PWM driven LEDs on TWL4030/6030 series of PMICs pwm: New driver to support PWMs on TWL4030/6030 series of PMICs pwm: pwm-tiehrpwm: pinctrl support pwm: tiehrpwm: Add device-tree binding pwm: pwm-tiehrpwm: Adding TBCLK gating support. pwm: pwm-tiecap: pinctrl support pwm: tiecap: Add device-tree binding pwm: Add TI PWM subsystem driver pwm: Device tree support for PWM polarity pwm: vt8500: Ensure PWM clock is enabled during pwm_config pwm: vt8500: Fix build error pwm: spear: Staticize spear_pwm_config() pwm: Add SPEAr PWM chip driver support ...
2012-11-29pwm: 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> Acked-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-29pwm: 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> Acked-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-29pwm: 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> Acked-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-28pwm: pwm-tiehrpwm: pinctrl supportPhilip, Avinash1-0/+6
Enable pinctrl for pwm-tiehrpwm if pinctrl driver available, else bail out with warning message. Signed-off-by: Philip, Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-11-28pwm: tiehrpwm: Add device-tree bindingPhilip, Avinash1-1/+41
This patch 1. Add support for device-tree binding for EHRWPM driver. 2. Set size of pwm-cells set to 3 to support PWM channel number, PWM period & polarity configuration from device tree. 3. Add enable/disable clock gating in PWM subsystem common config space. 4. When here set .owner member in platform_driver structure to THIS_MODULE. Signed-off-by: Philip, Avinash <avinashphilip@ti.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Rob Landley <rob@landley.net> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-11-28pwm: pwm-tiehrpwm: Adding TBCLK gating support.Philip, Avinash1-0/+14
Some platforms (like AM33XX) requires clock gating from control module explicitly for TBCLK. Enabling of this clock required for the functioning of the time base sub module in EHRPWM module. Adding support for handling by enabling the clock on PWM device enable & disable on PWM device disable. Platforms don't have explicit TBCLK gating has to add dummy TBCLK node. Signed-off-by: Philip, Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-10-05pwm: Check for negative duty-cycle and periodThierry Reding1-1/+1
Make sure the duty-cycle and period passed in are not negative. This should eventually be made implicit by making them unsigned. While at it, the drivers' .config() implementations can have the equivalent checks removed. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Cc: Shawn Guo <shawn.guo@linaro.org> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Sachin Kamat <sachin.kamat@linaro.org> Cc: Axel Lin <axel.lin@gmail.com> Cc: Kukjin Kim <kgene.kim@samsung.com> Cc: Jingoo Han <jg1.han@samsung.com> Cc: Jonghwan Choi <jhbird.choi@samsung.com> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: "Philip, Avinash" <avinashphilip@ti.com> Cc: Vaibhav Bedia <vaibhav.bedia@ti.com> Acked-by: Jingoo Han <jg1.han@samsung.com>
2012-09-10pwm: pwm-tiehrpwm: Add support for configuring polarity of PWMPhilip, Avinash1-22/+51
EHRPWM hardware supports polarity configuration of PWM output. However configuration of polarity done in hardware only in .enable() to ensure PWM output present only after enabling PWM. This commit adds support for polarity configuration for EHRPWM. When being here, remove configuring of polarity during .config() and do it explicitly from .set_polarity(). Signed-off-by: Philip, Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-09-10pwm: pwm-tiehrpwm: Fix conflicting channel period settingPhilip, Avinash1-0/+29
EHRPWM hardware supports 2 independent PWM channels. However the device uses only one register to handle period setting for both channels. So both channels should be configured for same period (in nsec). Fix the same by returning error for conflicting period values. However, allow 1. Configuration of period settings if not conflicting with other channels 2. Re-configuring of period settings if no other channels being configured Signed-off-by: Philip, Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-08-17pwm: Remove a redundant error message when devm_request_and_ioremap failsAxel Lin1-3/+1
The implementation in devm_request_and_ioremap() already shows error message, so no need to show dev_err again if devm_request_and_ioremap() fails. Signed-off-by: Axel Lin <axel.lin@gmail.com> Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Philip, Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-07-26pwm: pwm-tiehrpwm: PWM driver support for EHRPWMPhilip, Avinash1-0/+411
Enhanced high resolution PWM module (EHRPWM) hardware can be used to generate PWM output over 2 channels. This commit adds PWM driver support for EHRPWM device present on AM33XX SOC. Current implementation supports simple PWM functionality. Reviewed-by: Vaibhav Bedia <vaibhav.bedia@ti.com> Signed-off-by: Philip, Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
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