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cpu_pm: Add cpu power management notifiers

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During some CPU power modes entered during idle, hotplug and
suspend, peripherals located in the CPU power domain, such as
the GIC, localtimers, and VFP, may be powered down.  Add a
notifier chain that allows drivers for those peripherals to
be notified before and after they may be reset.

Notified drivers can include VFP co-processor, interrupt controller
and it's PM extensions, local CPU timers context save/restore which
shouldn't be interrupted. Hence CPU PM event APIs  must be called
with interrupts disabled.

Signed-off-by: Colin Cross <[email protected]>
Signed-off-by: Santosh Shilimkar <[email protected]>
Reviewed-by: Kevin Hilman <[email protected]>
Tested-and-Acked-by: Shawn Guo <[email protected]>
Tested-by: Kevin Hilman <[email protected]>
Tested-by: Vishwanath BS <[email protected]>
This commit is contained in:
Colin Cross 2011-02-10 02:04:45 -08:00 • committed by Santosh Shilimkar
commit ab10023e00
4 changed files with 314 additions and 0 deletions
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4
kernel/power/Kconfig
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@ -235,3 +235,7 @@ config PM_GENERIC_DOMAINS
config PM_GENERIC_DOMAINS_RUNTIME
def_bool y
depends on PM_RUNTIME && PM_GENERIC_DOMAINS
config CPU_PM
bool
depends on SUSPEND || CPU_IDLE