ARM: tegra: Add tegra_pm_park_secondary_cpu()

This function resembles tegra_cpu_die() of the hotplug code, but
this variant is more suitable to be used for CPU PM because it's made
specifically to be used by cpu_suspend(). In short this function puts
secondary CPU offline, it will be used by the new CPUIDLE driver.

Acked-by: Peter De Schrijver <[e-mail]>
Tested-by: Peter Geis <[e-mail]>
Tested-by: Jasper Korten <[e-mail]>
Tested-by: David Heidelberg <[e-mail]>
Tested-by: Nicolas Chauvet <[e-mail]>
Signed-off-by: Dmitry Osipenko <[e-mail]>
Signed-off-by: Thierry Reding <[e-mail]>

arch/arm/mach-tegra/pm.c

···
 
 	suspend_set_ops(&tegra_suspend_ops);
 }
+
+int tegra_pm_park_secondary_cpu(unsigned long cpu)
+{
+	if (cpu > 0) {
+		tegra_disable_clean_inv_dcache(TEGRA_FLUSH_CACHE_LOUIS);
+
+		if (tegra_get_chip_id() == TEGRA20)
+			tegra20_hotplug_shutdown();
+		else
+			tegra30_hotplug_shutdown();
+	}
+
+	return -EINVAL;
+}
 #endif

arch/arm/mach-tegra/pm.h

···
 
 #ifdef CONFIG_PM_SLEEP
 void tegra_init_suspend(void);
+int tegra_pm_park_secondary_cpu(unsigned long cpu);
 #else
 static inline void tegra_init_suspend(void) {}
+static inline int tegra_pm_park_secondary_cpu(unsigned long cpu)
+{
+	return -ENOTSUPP;
+}
 #endif
 
 #endif /* _MACH_TEGRA_PM_H_ */