[ARM/tegra] suspend: add suspend to LP2

implement basic support for system suspend operations using LP2 (CPU
power-gating)

platform-specific data (power good times, PMU capabilities, etc.) must be
specified when registering the suspend operations, and a helper function
for mapping from wakeup pad and PMU property data from the ODM kit to
the platform_data structure is provided.

AVP & RM suspend is performed in the prepare_late callback, ensuring that
these operations are executed after all drivers have suspended, to eliminate
ordering conflicts on RM dependencies

since all device interrupts (except timers) are disabled in the suspend
path, the wakeup interrupts need to be manually unmasked before entering
into a suspend state or the processor will never wake up; these forced-unmask
interrupts are re-masked immediately in the resume path to prevent the
kernel from live-locking prior to driver resume.

Change-Id: Ibe4d594d450b253744d803a0a15d66ae275029e8

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/arm/mach-tegra/board.h b/arch/arm/mach-tegra/board.h
index 85195a8cc87d..702a52ff1936 100644
--- a/arch/arm/mach-tegra/board.h
+++ b/arch/arm/mach-tegra/board.h
@@ -23,11 +23,13 @@
 
 #include <linux/types.h>
 
+struct tegra_suspend_platform_data;
+
 void __init tegra_common_init(void);
 void __init tegra_map_common_io(void);
 void __init tegra_init_irq(void);
 void __init tegra_init_clock(void);
-void __init tegra_init_suspend(void);
+void __init tegra_init_suspend(struct tegra_suspend_platform_data *plat);
 
 #ifdef CONFIG_CPU_FREQ
 int tegra_start_dvfsd(void);