[PATCH v2 0/2] Enabling PSCI based idle on ARM 32-bit platforms

Lorenzo Pieralisi lorenzo.pieralisi at arm.com
Mon Oct 12 04:17:06 PDT 2015

This patch series is v2 of a previous posting:



- Refactored patch 1 to remove cpu parameter from cpuidle_ops
  suspend hook
- Refactored psci_cpu_init_idle to stub out dt parsing function and
  make it usable on both ARM/ARM64 with no additional changes
- Updated ARM cpuidle_ops to new interfaces
- Fixed PSCI enable method string in ARM cpuidle_ops struct

PSCI firmware provides a kernel API that, through a standard interface,
allows to manage power states transitions in a seamless manner for
ARM and ARM64 systems.

Current PSCI code that initializes CPUidle states on PSCI based
systems lives in arch/arm64 directory but it is not ARM64 specific
and can be shared with ARM 32-bit systems so that the generic
ARM CPUidle driver can leverage the common PSCI interface.

This patch series moves PSCI CPUidle management code to
drivers/firmware directory so that ARM and ARM64 architecture
can actually share the code.

It is made up of two patches:

Patch 1 refactors ARM 32-bit generic idle implementation to remove
the cpu parameter from the cpuidle_ops suspend hook, in preparation
for a common PSCI implementation for ARM/ARM64 PSCI idle.

Patch 2 moves ARM64 PSCI CPUidle functions implementation to
drivers/firmware so that it can be shared with ARM 32-bit platforms
code. This patch also adds a PSCI entry section on ARM 32-bit systems
so that the PSCI CPUidle back-end can be enabled when the enable-method
corresponds to PSCI.

Patches apply on top of current patch stack to enable PSCI 1.0:

git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git tags/firmware/psci-1.0

Tested on Juno board (ARM64), compile tested only on ARM 32-bit systems.

Lorenzo Pieralisi (2):
  ARM: cpuidle: remove cpu parameter from the cpuidle_ops suspend hook
  ARM64: kernel: PSCI: move PSCI idle management code to

 arch/arm/include/asm/cpuidle.h |   2 +-
 arch/arm/kernel/cpuidle.c      |   2 +-
 arch/arm64/kernel/psci.c       |  99 +-----------------------------
 drivers/firmware/Makefile      |   2 +-
 drivers/firmware/psci_cpuops.c | 133 +++++++++++++++++++++++++++++++++++++++++
 drivers/soc/qcom/spm.c         |  10 ++--
 include/linux/psci.h           |   3 +
 7 files changed, 146 insertions(+), 105 deletions(-)
 create mode 100644 drivers/firmware/psci_cpuops.c


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