From: Joseph Lo <josephl@nvidia.com>
Date: Fri, 19 Jul 2013 09:25:25 +0000 (+0800)
Subject: ARM: tegra114: add low level support for CPU idle powered-down mode
X-Git-Tag: v3.12-rc1~115^2~13^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1b9e6b2745621984b4aad49b0386814815fb15e7;p=pandora-kernel.git

ARM: tegra114: add low level support for CPU idle powered-down mode

The flow controller would take care the power sequence when CPU idle in
powered-down mode. It powered gate the CPU when CPU runs into WFI
instruction. And wake up the CPU when event be triggered.

The sequence is below.
* setting wfi bitmap for the CPU as the halt event in the
  FLOW_CTRL_CPU_HALT_REG to monitor the CPU running into WFI,then power
  gate it
* setting IRQ and FIQ as wake up event to wake up CPU when event triggered

Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
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