litmus-rt-ext-res.git/drivers/clocksource/Kconfig, branch EXT-RES

clocksource: Add J-Core timer/clocksource driver

2016-10-20T18:10:17+00:00

At the hardware level, the J-Core PIT is integrated with the interrupt
controller, but it is represented as its own device and has an
independent programming interface. It provides a 12-bit countdown
timer, which is not presently used, and a periodic timer. The interval
length for the latter is programmable via a 32-bit throttle register
whose units are determined by a bus-period register. The periodic
timer is used to implement both periodic and oneshot clock event
modes; in oneshot mode the interrupt handler simply disables the timer
as soon as it fires.

Despite its device tree node representing an interrupt for the PIT,
the actual irq generated is programmable, not hard-wired. The driver
is responsible for programming the PIT to generate the hardware irq
number that the DT assigns to it.

On SMP configurations, J-Core provides cpu-local instances of the PIT;
no broadcast timer is needed. This driver supports the creation of the
necessary per-cpu clock_event_device instances.

A nanosecond-resolution clocksource is provided using the J-Core "RTC"
registers, which give a 64-bit seconds count and 32-bit nanoseconds
that wrap every second. The driver converts these to a full-range
32-bit nanoseconds count.

Signed-off-by: Rich Felker 
Cc: Mark Rutland 
Cc: devicetree@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Cc: Daniel Lezcano 
Cc: Rob Herring 
Link: http://lkml.kernel.org/r/b591ff12cc5ebf63d1edc98da26046f95a233814.1476393790.git.dalias@libc.org
Signed-off-by: Thomas Gleixner

Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

2016-10-08T04:23:40+00:00

Pull ARM SoC driver updates from Arnd Bergmann:
 "Driver updates for ARM SoCs, including a couple of newly added
  drivers:

   - The Qualcomm external bus interface 2 (EBI2), used in some of their
     mobile phone chips for connecting flash memory, LCD displays or
     other peripherals

   - Secure monitor firmware for Amlogic SoCs, and an NVMEM driver for
     the EFUSE based on that firmware interface.

   - Perf support for the AppliedMicro X-Gene performance monitor unit

   - Reset driver for STMicroelectronics STM32

   - Reset driver for SocioNext UniPhier SoCs

  Aside from these, there are minor updates to SoC-specific bus,
  clocksource, firmware, pinctrl, reset, rtc and pmic drivers"

* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (50 commits)
  bus: qcom-ebi2: depend on HAS_IOMEM
  pinctrl: mvebu: orion5x: Generalise mv88f5181l support for 88f5181
  clk: mvebu: Add clk support for the orion5x SoC mv88f5181
  dt-bindings: EXYNOS: Add Exynos5433 PMU compatible
  clocksource: exynos_mct: Add the support for ARM64
  perf: xgene: Add APM X-Gene SoC Performance Monitoring Unit driver
  Documentation: Add documentation for APM X-Gene SoC PMU DTS binding
  MAINTAINERS: Add entry for APM X-Gene SoC PMU driver
  bus: qcom: add EBI2 driver
  bus: qcom: add EBI2 device tree bindings
  rtc: rtc-pm8xxx: Add support for pm8018 rtc
  nvmem: amlogic: Add Amlogic Meson EFUSE driver
  firmware: Amlogic: Add secure monitor driver
  soc: qcom: smd: Reset rx tail rather than tx
  memory: atmel-sdramc: fix a possible NULL dereference
  reset: hi6220: allow to compile test driver on other architectures
  reset: zynq: add driver Kconfig option
  reset: sunxi: add driver Kconfig option
  reset: stm32: add driver Kconfig option
  reset: socfpga: add driver Kconfig option
  ...

arm64: arch_timer: Work around QorIQ Erratum A-008585

2016-09-23T16:19:25+00:00

Erratum A-008585 says that the ARM generic timer counter "has the
potential to contain an erroneous value for a small number of core
clock cycles every time the timer value changes".  Accesses to TVAL
(both read and write) are also affected due to the implicit counter
read.  Accesses to CVAL are not affected.

The workaround is to reread TVAL and count registers until successive
reads return the same value.  Writes to TVAL are replaced with an
equivalent write to CVAL.

The workaround is to reread TVAL and count registers until successive reads
return the same value, and when writing TVAL to retry until counter
reads before and after the write return the same value.

The workaround is enabled if the fsl,erratum-a008585 property is found in
the timer node in the device tree.  This can be overridden with the
clocksource.arm_arch_timer.fsl-a008585 boot parameter, which allows KVM
users to enable the workaround until a mechanism is implemented to
automatically communicate this information.

This erratum can be found on LS1043A and LS2080A.

Acked-by: Marc Zyngier 
Signed-off-by: Scott Wood 
[will: renamed read macro to reflect that it's not usually unstable]
Signed-off-by: Will Deacon

clocksource: exynos_mct: Add the support for ARM64

2016-09-16T11:07:53+00:00

This patch allows building and compile-testing the driver also for
ARM64.  The delay_timer is only supported on ARMv7.

Cc: Daniel Lezcano 
Cc: Thomas Gleixner 
Cc: Kukjin Kim 
Cc: Krzysztof Kozlowski 
Signed-off-by: Chanwoo Choi 
Acked-by: Daniel Lezcano 
[k.kozlowski: Adjusted commit msg]
Signed-off-by: Krzysztof Kozlowski

clocksource/drivers/arm_arch_timer: Control the evtstrm via the cmdline

2016-06-28T09:35:50+00:00

Disabling the eventstream can be useful for both remotely debugging a
deployed production system and development of code using WFE-based
polling loops. Whilst this can currently be controlled via a Kconfig
option (CONFIG_ARM_ARCH_TIMER_EVTSTREAM), it's often desirable to toggle
the feature on the command line, so this patch adds a new command-line
option ("clocksource.arm_arch_timer.evtstrm") to do just that. The
default behaviour is determined based on CONFIG_ARM_ARCH_TIMER_EVTSTREAM.

Cc: Marc Zyngier 
Cc: Mark Rutland 
Signed-off-by: Will Deacon 
Signed-off-by: Daniel Lezcano

clocksource/drivers/versatile: Add the COMPILE_TEST option

2016-06-28T08:22:18+00:00

Change the Kconfig option logic to fullfil with the current approach,
allowing the user to compile the driver on different platforms.

The current option let the user to select the clocksource or not.

The Kconfig option policy is to let the platform to select the
timer automatically.

Add the COMPILE_TEST option, so the prompt to select the driver will
be showed only when COMPILE_TEST is set and will let this driver
to compile on different platform, thus increasing the compilation
test coverage.

Signed-off-by: Daniel Lezcano

clocksource/drivers/timer-atmel-st: Add the COMPILE_TEST option

2016-06-28T08:22:17+00:00

Change the Kconfig option logic to fullfil with the current approach,
allowing the user to compile the driver on different platforms.

Signed-off-by: Daniel Lezcano

clocksource/drivers/arm_global_timer: Add the COMPILE_TEST option

2016-06-28T08:22:16+00:00

Change the Kconfig option logic to fullfil with the current approach,
allowing the user to compile the driver on different platforms.

Signed-off-by: Daniel Lezcano

clocksource/drivers/integrator-ap: Add the COMPILE_TEST option

2016-06-28T08:22:16+00:00

Change the Kconfig option logic to fullfil with the current approach.

A new Kconfig option is added, CONFIG_INTEGRATOR_AP_TIMER and is selected
by the platform. Then the clocksource's Kconfig is changed to make this
option selectable by the user if the COMPILE_TEST option is set. Otherwise,
it is up to the platform's Kconfig to select the timer.

Signed-off-by: Daniel Lezcano

clocksource/drivers/keystone: Add the COMPILE_TEST option

2016-06-28T08:22:15+00:00

Change the Kconfig option logic to fullfil with the current approach.

A new Kconfig option is added, CONFIG_KEYSTONE_TIMER and is selected by the
platform. Then the clocksource's Kconfig is changed to make this option
selectable by the user if the COMPILE_TEST option is set. Otherwise, it is
up to the platform's Kconfig to select the timer.

Signed-off-by: Daniel Lezcano