linux-kernel - [PATCH v3 0/6] ARM/ARM64 architected timer updates

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Date:	Tue, 13 Aug 2013 18:29:38 +0100
From:	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Sudeep.KarkadaNagesha@....com,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>
Subject: [PATCH v3 0/6] ARM/ARM64 architected timer updates

From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>

This patch series adds support to configure the rate and enable the
event stream for architected timer. The event streams can be used to
impose a timeout on a WFE, to safeguard against any programming error
in case an expected event is not generated or even to implement
wfe-based timeouts for userspace locking implementations.

Since the timer control register is reset to zero on warm boot, CPU
PM notifier is added to re-initialize it.

Changes v2->v3:
1. Moved ARM and ARM64 changes into separate patches
2. Added native hwcaps definations(ARM/ARM64) and compat-specific
   definitions(ARM64) to the users for the event stream feature. 

Changes v1->v2:
1. Saved event stream divider value on cold reset path and re-used it
   in CPU PM notifier instead of calculating every time.
2. Rebased on v3.11-rc2(to avoid conflicts with __cpuinit* deletion)
3. Dropped "ARM/ARM64: arch_timer: remove __cpuinit attribute for
   arch_counter_set_user_access"(already done as part of __cpuinit*
   deletion)

Regards,
Sudeep

Sudeep KarkadaNagesha (5):
  ARM/ARM64: arch_timer: add macros for bits in control register
  ARM: arch_timer: configure and enable event stream
  ARM64: arch_timer: configure and enable event stream
  drivers: clocksource: enable hwcaps for event stream on ARM arch timer
  drivers: clocksource: add CPU PM notifier for ARM architected timer

Will Deacon (1):
  drivers: clocksource: configure event stream for ARM arch timer

 arch/arm/include/asm/arch_timer.h    | 18 +++++++++++---
 arch/arm/include/uapi/asm/hwcap.h    |  1 +
 arch/arm/kernel/setup.c              |  1 +
 arch/arm64/include/asm/arch_timer.h  | 22 +++++++++++++----
 arch/arm64/include/asm/hwcap.h       |  4 ++-
 arch/arm64/include/uapi/asm/hwcap.h  |  1 +
 arch/arm64/kernel/setup.c            |  1 +
 drivers/clocksource/arm_arch_timer.c | 48 +++++++++++++++++++++++++++++++++++-
 include/clocksource/arm_arch_timer.h | 10 ++++++++
 9 files changed, 96 insertions(+), 10 deletions(-)

-- 
1.8.1.2

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