c509311df5
The ARM architected timer can generate events (used for waking up
CPUs executing the wfe instruction) at a frequency represented as a
power-of-2 divisor of the clock rate.
An event stream might be used:
- To implement wfe-based timeouts for userspace locking implementations.
- To impose a timeout on a wfe for safeguarding against any programming
error in case an expected event is not generated.
This patch computes the event stream frequency aiming for a period
of 100us between events. It uses ARM/ARM64 specific backends to configure
and enable the event stream.
Change-Id: I43906fa7d083a2c611c2047e15c34d68bb047ac7
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Will Deacon <will.deacon@arm.com>
[sudeep: moving ARM/ARM64 changes into separate patches
and adding Kconfig option]
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
Git-commit: 37f637767a82907efedda78d3ff405c34020075
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[tsoni@codeaurora.org: Fixed trivial merge conflicts]
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>
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| .. | ||
| arm_arch_timer.h | ||
| metag_generic.h | ||
| samsung_pwm.h | ||