ARM: tegra: Add dvfs

Change-Id: I865e52cae592507c642b92dde3a8293db2d0228f
Signed-off-by: Colin Cross <ccross@android.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/dvfs.h b/arch/arm/mach-tegra/dvfs.h
new file mode 100644
index 000000000000..68622b899c59
--- /dev/null
+++ b/arch/arm/mach-tegra/dvfs.h
@@ -0,0 +1,93 @@
+/*
+ *
+ * Copyright (C) 2010 Google, Inc.
+ *
+ * Author:
+ *	Colin Cross <ccross@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _TEGRA_DVFS_H_
+#define _TEGRA_DVFS_H_
+
+#define MAX_DVFS_FREQS	16
+
+struct clk;
+struct dvfs_rail;
+
+/*
+ * dvfs_relationship between to rails, "from" and "to"
+ * when the rail changes, it will call dvfs_rail_update on the rails
+ * in the relationship_to list.
+ * when determining the voltage to set a rail to, it will consider each
+ * rail in the relationship_from list.
+ */
+struct dvfs_relationship {
+	struct dvfs_rail *to;
+	struct dvfs_rail *from;
+	int (*solve)(struct dvfs_rail *, struct dvfs_rail *);
+
+	struct list_head to_node; /* node in relationship_to list */
+	struct list_head from_node; /* node in relationship_from list */
+};
+
+struct dvfs_rail {
+	const char *reg_id;
+	int min_millivolts;
+	int max_millivolts;
+	int nominal_millivolts;
+	int step;
+	bool disabled;
+
+	struct list_head node;  /* node in dvfs_rail_list */
+	struct list_head dvfs;  /* list head of attached dvfs clocks */
+	struct list_head relationships_to;
+	struct list_head relationships_from;
+	struct regulator *reg;
+	int millivolts;
+	int new_millivolts;
+	bool suspended;
+};
+
+struct dvfs {
+	/* Used only by tegra2_clock.c */
+	const char *clk_name;
+	int cpu_process_id;
+
+	/* Must be initialized before tegra_dvfs_init */
+	int freqs_mult;
+	unsigned long freqs[MAX_DVFS_FREQS];
+	const int *millivolts;
+	struct dvfs_rail *dvfs_rail;
+	bool auto_dvfs;
+
+	/* Filled in by tegra_dvfs_init */
+	int max_millivolts;
+	int num_freqs;
+
+	int cur_millivolts;
+	unsigned long cur_rate;
+	struct list_head node;
+	struct list_head debug_node;
+	struct list_head reg_node;
+};
+
+void tegra2_init_dvfs(void);
+int tegra_enable_dvfs_on_clk(struct clk *c, struct dvfs *d);
+int dvfs_debugfs_init(struct dentry *clk_debugfs_root);
+int tegra_dvfs_late_init(void);
+int tegra_dvfs_init_rails(struct dvfs_rail *dvfs_rails[], int n);
+void tegra_dvfs_add_relationships(struct dvfs_relationship *rels, int n);
+void tegra_dvfs_rail_enable(struct dvfs_rail *rail);
+void tegra_dvfs_rail_disable(struct dvfs_rail *rail);
+
+#endif