ARM: tegra: Convert PMC to a driver

This commit converts the PMC support code to a platform driver. Because
the boot process needs to call into this driver very early, also set up
a minimal environment via an early initcall.

Signed-off-by: Thierry Reding <treding@nvidia.com>

2 files changed, 65 insertions, 4 deletions

diff --git a/include/soc/tegra/pm.h b/include/soc/tegra/pm.h
new file mode 100644
index 000000000000..30fe2078a547
--- /dev/null
+++ b/include/soc/tegra/pm.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2014 NVIDIA Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __SOC_TEGRA_PM_H__
+#define __SOC_TEGRA_PM_H__
+
+enum tegra_suspend_mode {
+        TEGRA_SUSPEND_NONE = 0,
+        TEGRA_SUSPEND_LP2, /* CPU voltage off */
+        TEGRA_SUSPEND_LP1, /* CPU voltage off, DRAM self-refresh */
+        TEGRA_SUSPEND_LP0, /* CPU + core voltage off, DRAM self-refresh */
+        TEGRA_MAX_SUSPEND_MODE,
+};
+
+#ifdef CONFIG_PM_SLEEP
+enum tegra_suspend_mode
+tegra_pm_validate_suspend_mode(enum tegra_suspend_mode mode);
+
+/* low-level resume entry point */
+void tegra_resume(void);
+#else
+static inline enum tegra_suspend_mode
+tegra_pm_validate_suspend_mode(enum tegra_suspend_mode mode)
+{
+        return TEGRA_SUSPEND_NONE;
+}
+
+static inline void tegra_resume(void)
+{
+}
+#endif /* CONFIG_PM_SLEEP */
+
+#endif /* __SOC_TEGRA_PM_H__ */
diff --git a/include/soc/tegra/powergate.h b/include/soc/tegra/pmc.h
index c16912ed1a8d..65a93273e72f 100644
--- a/include/soc/tegra/powergate.h
+++ b/include/soc/tegra/pmc.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2010 Google, Inc
+ * Copyright (c) 2014 NVIDIA Corporation
  *
  * Author:
  *      Colin Cross <ccross@google.com>
@@ -15,12 +16,34 @@
  *
  */
 
-#ifndef __SOC_TEGRA_POWERGATE_H__
-#define __SOC_TEGRA_POWERGATE_H__
+#ifndef __SOC_TEGRA_PMC_H__
+#define __SOC_TEGRA_PMC_H__
+
+#include <linux/reboot.h>
+
+#include <soc/tegra/pm.h>
 
 struct clk;
 struct reset_control;
 
+void tegra_pmc_restart(enum reboot_mode mode, const char *cmd);
+
+#ifdef CONFIG_PM_SLEEP
+enum tegra_suspend_mode tegra_pmc_get_suspend_mode(void);
+void tegra_pmc_set_suspend_mode(enum tegra_suspend_mode mode);
+void tegra_pmc_enter_suspend_mode(enum tegra_suspend_mode mode);
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_SMP
+bool tegra_pmc_cpu_is_powered(int cpuid);
+int tegra_pmc_cpu_power_on(int cpuid);
+int tegra_pmc_cpu_remove_clamping(int cpuid);
+#endif /* CONFIG_SMP */
+
+/*
+ * powergate and I/O rail APIs
+ */
+
 #define TEGRA_POWERGATE_CPU     0
 #define TEGRA_POWERGATE_3D      1
 #define TEGRA_POWERGATE_VENC    2
@@ -129,6 +152,6 @@ static inline int tegra_io_rail_power_off(int id)
 {
         return -ENOSYS;
 }
-#endif
+#endif /* CONFIG_ARCH_TEGRA */
 
-#endif /* __SOC_TEGRA_POWERGATE_H__ */
+#endif /* __SOC_TEGRA_PMC_H__ */