ARM: tegra30: clocks: add CPU low-power function into tegra_cpu_car_ops

Add suspend, resume and rail_off_ready API into tegra_cpu_car_ops. These
functions were used for CPU powered-down state maintenance. One thing
needs to notice the rail_off_ready API only availalbe for cpu_g cluster
not cpu_lp cluster.

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

1 files changed, 37 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/tegra_cpu_car.h b/arch/arm/mach-tegra/tegra_cpu_car.h
index 30d063ad2bef..9764d31032b7 100644
--- a/arch/arm/mach-tegra/tegra_cpu_car.h
+++ b/arch/arm/mach-tegra/tegra_cpu_car.h
@@ -30,6 +30,12 @@
  *      CPU clock un-gate
  * disable_clock:
  *      CPU clock gate
+ * rail_off_ready:
+ *      CPU is ready for rail off
+ * suspend:
+ *      save the clock settings when CPU go into low-power state
+ * resume:
+ *      restore the clock settings when CPU exit low-power state
  */
 struct tegra_cpu_car_ops {
         void (*wait_for_reset)(u32 cpu);
@@ -37,6 +43,11 @@ struct tegra_cpu_car_ops {
         void (*out_of_reset)(u32 cpu);
         void (*enable_clock)(u32 cpu);
         void (*disable_clock)(u32 cpu);
+#ifdef CONFIG_PM_SLEEP
+        bool (*rail_off_ready)(void);
+        void (*suspend)(void);
+        void (*resume)(void);
+#endif
 };
 
 extern struct tegra_cpu_car_ops *tegra_cpu_car_ops;
@@ -81,6 +92,32 @@ static inline void tegra_disable_cpu_clock(u32 cpu)
         tegra_cpu_car_ops->disable_clock(cpu);
 }
 
+#ifdef CONFIG_PM_SLEEP
+static inline bool tegra_cpu_rail_off_ready(void)
+{
+        if (WARN_ON(!tegra_cpu_car_ops->rail_off_ready))
+                return false;
+
+        return tegra_cpu_car_ops->rail_off_ready();
+}
+
+static inline void tegra_cpu_clock_suspend(void)
+{
+        if (WARN_ON(!tegra_cpu_car_ops->suspend))
+                return;
+
+        tegra_cpu_car_ops->suspend();
+}
+
+static inline void tegra_cpu_clock_resume(void)
+{
+        if (WARN_ON(!tegra_cpu_car_ops->resume))
+                return;
+
+        tegra_cpu_car_ops->resume();
+}
+#endif
+
 void tegra20_cpu_car_ops_init(void);
 void tegra30_cpu_car_ops_init(void);