Makes the choice CORTEX_M_SYSTICK_LPM dependent upon the
CORTEX_M_SYSTICK to prevent its default from showing up in
the .config of projects that do not use the CORTEX_M_SYSTICK
timer driver.
Signed-off-by: Peter Mitsis <peter.mitsis@intel.com>
Modify the Cortex-M SysTick driver to work when the SoC resets SysTick
in low-power mode. This adds an invisible Kconfig symbol that must be
selected by SoCs with such behavior.
Signed-off-by: Mathieu Choplain <mathieu.choplain@st.com>
Add support for a hook-based low-power mode timer to the Cortex-M SysTick
driver, in addition to the existing Counter API-based timer. This is useful
on platforms such as the STM32WB0 where the wake-up timer is too limited
for a Counter API driver to be implemented on top of it.
Signed-off-by: Mathieu Choplain <mathieu.choplain@st.com>
The Cortex-M SysTick supported collaboration with a so-called "IDLE timer"
to work even in low-power modes, when the SoC may disable its clock.
Rename "IDLE timer" to "low-power mode timer" to better reflect what this
timer is used for, and transform the single option into a Kconfig choice
to allow other behaviors to be implemented and chosen.
Signed-off-by: Mathieu Choplain <mathieu.choplain@st.com>
Allow enabling the Cortex-m idle timer only if power management is set.
It doesn't make sense to use an idle timer without PM.
It allows adding the idle timer chosen node to dts without enabling the
idle timer by default. Now, the PM config has to be set as well.
Signed-off-by: Dawid Niedzwiecki <dawidn@google.com>
Some chips, that use Cortex-M SysTick as the system timer, disable a
clock in a low power mode, that is the input for the SysTick e.g.
STM32Fx family.
It blocks enabling power management for these chips. The wake-up
function doesn't work and the time measurement is lost.
Add an additional IDLE timer that handles these functionality when the
system is about to enter IDLE. It has to wake up the chip and update the
cycle counter by time not measured by the SysTick. The IDLE timer has to
support counter API (setting alarm and reading current value).
Signed-off-by: Dawid Niedzwiecki <dawidn@google.com>
This driver, due to its limited 24-bits counter, is already tracking a
cycle count in software. Allow that count to be a 64-bits value so this
won't wrap in a matter of only a few seconds when the hardware clock
is fast.
This is very cheap to do as expensive math operations (i.e. divisions)
are performed only on counter intervals whose values fit in 32 bits like
before.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Update timer drivers to use DT_HAS_<compat>_ENABLED Kconfig symbol
to expose the driver and enable it by default based on devicetree.
We remove 'depend on' Kconfig for symbols that would be implied by
the devicetree node existing.
Signed-off-by: Kumar Gala <galak@kernel.org>
A Cortex-M specific function (sys_clock_isr()) was defined as a weak
function, so in practice it was always available when system clock was
enabled, even if no Cortex-M systick was available. This patch
introduces an auxiliary Kconfig option that, when selected, the ISR
function gets installed. External SysTick drivers can also make use of
this function, thus achieving the same functionality offered today but
in a cleaner way.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
- Remove the weak symbol definition
- Notify about the capability of disabling via a selected Kconfig option
(CONFIG_SYSTEM_TIMER_HAS_DISABLE_SUPPORT)
- Provide a dummy inline function when the functionality is not
available
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
Split Kconfig into individual files for each driver. This improves
overall readability of the Kconfig options.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
Peter Mitsis
Mathieu Choplain
Dawid Niedzwiecki
Nicolas Pitre
Kumar Gala
Gerard Marull-Paretas