ARM: tegra20: add CPU hotplug support

Hotplug function put CPU in offline or online mode at runtime.
When the CPU been put into offline, it was been clock gated. The
offline CPU can be power gated, when the remaining CPU goes into
LP2.

Based on the worked by:
Colin Cross <ccross@android.com>
Gary King <gking@nvidia.com>

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

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/sleep.h b/arch/arm/mach-tegra/sleep.h
index 0f047eb3ca2e..e25a7cd703d9 100644
--- a/arch/arm/mach-tegra/sleep.h
+++ b/arch/arm/mach-tegra/sleep.h
@@ -23,6 +23,8 @@
                                         + IO_CPU_VIRT)
 #define TEGRA_FLOW_CTRL_VIRT (TEGRA_FLOW_CTRL_BASE - IO_PPSB_PHYS \
                                         + IO_PPSB_VIRT)
+#define TEGRA_CLK_RESET_VIRT (TEGRA_CLK_RESET_BASE - IO_PPSB_PHYS \
+                                        + IO_PPSB_VIRT)
 
 #ifdef __ASSEMBLY__
 /* returns the offset of the flow controller halt register for a cpu */
@@ -72,8 +74,10 @@
 #else
 
 #ifdef CONFIG_HOTPLUG_CPU
+void tegra20_hotplug_init(void);
 void tegra30_hotplug_init(void);
 #else
+static inline void tegra20_hotplug_init(void) {}
 static inline void tegra30_hotplug_init(void) {}
 #endif