ARM: tegra: power: Added global EDP Capping table

 - Added table with EDP Capping values for different SKUs/regulator
   currents in new file edp.c
 - New entry point tegra_init_cpu_edp_limits()
 - Added DebugFS entry under debug/edp to list the currently
   selected EDP table
 - Populated EDP table in edp.c with data from Bug 844268
 - edp.c keeps main EDP table; cpu-tegra.c and board-cardhu-power.c
   both read from there

Bug 840255

Original-Change-Id: I55c2ee16278be8cd3005218bedebe76846d137d8
Reviewed-on: http://git-master/r/40938
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>

Rebase-Id: R9a5f2bcfc1e6e0b5aee37cd700d75f9ef5cea30b

1 files changed, 229 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/edp.c b/arch/arm/mach-tegra/edp.c
new file mode 100644
index 000000000000..9d935292841d
--- /dev/null
+++ b/arch/arm/mach-tegra/edp.c
@@ -0,0 +1,229 @@
+/*
+ * arch/arm/mach-tegra/edp.c
+ *
+ * Copyright (C) 2011 NVIDIA, Inc.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307, USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <mach/edp.h>
+
+#include "fuse.h"
+
+
+static const struct tegra_edp_limits *edp_limits;
+static int edp_limits_size;
+
+
+/*
+ * Temperature step size cannot be less than 4C because of hysteresis
+ * delta
+ * Code assumes different temperatures for the same speedo_id /
+ * regulator_cur are adjacent in the table, and higest regulator_cur
+ * comes first
+ */
+static char __initdata tegra_edp_map[] = {
+	0x00, 0x3d, 0x2d, 0x8c, 0x82, 0x82, 0x82, 0x00,
+	0x3d, 0x3c, 0x8c, 0x82, 0x82, 0x82, 0x00, 0x3d,
+	0x4b, 0x8c, 0x82, 0x82, 0x82, 0x00, 0x3d, 0x5a,
+	0x8c, 0x82, 0x82, 0x82, 0x00, 0x32, 0x2d, 0x8c,
+	0x82, 0x82, 0x82, 0x00, 0x32, 0x3c, 0x8c, 0x82,
+	0x82, 0x82, 0x00, 0x32, 0x4b, 0x8c, 0x82, 0x82,
+	0x78, 0x00, 0x32, 0x5a, 0x8c, 0x82, 0x82, 0x6e,
+	0x00, 0x28, 0x2d, 0x8c, 0x82, 0x82, 0x78, 0x00,
+	0x28, 0x3c, 0x8c, 0x82, 0x82, 0x73, 0x00, 0x28,
+	0x4b, 0x8c, 0x82, 0x78, 0x6e, 0x00, 0x28, 0x5a,
+	0x8c, 0x82, 0x73, 0x5f, 0x00, 0x23, 0x2d, 0x8c,
+	0x82, 0x82, 0x6e, 0x00, 0x23, 0x3c, 0x8c, 0x82,
+	0x78, 0x69, 0x00, 0x23, 0x4b, 0x8c, 0x82, 0x73,
+	0x5f, 0x00, 0x23, 0x5a, 0x8c, 0x82, 0x69, 0x55,
+	0x01, 0x2f, 0x2d, 0x8c, 0x78, 0x78, 0x78, 0x01,
+	0x2f, 0x3c, 0x8c, 0x78, 0x78, 0x78, 0x01, 0x2f,
+	0x4b, 0x8c, 0x78, 0x78, 0x78, 0x01, 0x2f, 0x5a,
+	0x8c, 0x78, 0x78, 0x78, 0x01, 0x28, 0x2d, 0x8c,
+	0x78, 0x78, 0x78, 0x01, 0x28, 0x3c, 0x8c, 0x78,
+	0x78, 0x78, 0x01, 0x28, 0x4b, 0x8c, 0x78, 0x78,
+	0x73, 0x01, 0x28, 0x5a, 0x8c, 0x78, 0x73, 0x69,
+	0x01, 0x23, 0x2d, 0x8c, 0x78, 0x78, 0x78, 0x01,
+	0x23, 0x3c, 0x8c, 0x78, 0x78, 0x6e, 0x01, 0x23,
+	0x4b, 0x8c, 0x78, 0x78, 0x64, 0x01, 0x23, 0x5a,
+	0x8c, 0x78, 0x6e, 0x5a, 0x01, 0x1e, 0x2d, 0x8c,
+	0x78, 0x78, 0x69, 0x01, 0x1e, 0x3c, 0x8c, 0x78,
+	0x78, 0x64, 0x01, 0x1e, 0x4b, 0x8c, 0x78, 0x6e,
+	0x5a, 0x01, 0x1e, 0x5a, 0x8c, 0x78, 0x64, 0x5a,
+	0x01, 0x19, 0x2d, 0x8c, 0x78, 0x6e, 0x5a, 0x01,
+	0x19, 0x3c, 0x8c, 0x78, 0x69, 0x55, 0x01, 0x19,
+	0x4b, 0x8c, 0x78, 0x5f, 0x4b, 0x01, 0x19, 0x5a,
+	0x8c, 0x73, 0x5a, 0x3c, 0x02, 0x3d, 0x2d, 0x8c,
+	0x82, 0x82, 0x82, 0x02, 0x3d, 0x3c, 0x8c, 0x82,
+	0x82, 0x82, 0x02, 0x3d, 0x4b, 0x8c, 0x82, 0x82,
+	0x82, 0x02, 0x3d, 0x5a, 0x8c, 0x82, 0x82, 0x82,
+	0x02, 0x32, 0x2d, 0x8c, 0x82, 0x82, 0x82, 0x02,
+	0x32, 0x3c, 0x8c, 0x82, 0x82, 0x82, 0x02, 0x32,
+	0x4b, 0x8c, 0x82, 0x82, 0x78, 0x02, 0x32, 0x5a,
+	0x8c, 0x82, 0x82, 0x6e, 0x02, 0x28, 0x2d, 0x8c,
+	0x82, 0x82, 0x78, 0x02, 0x28, 0x3c, 0x8c, 0x82,
+	0x82, 0x73, 0x02, 0x28, 0x4b, 0x8c, 0x82, 0x78,
+	0x6e, 0x02, 0x28, 0x5a, 0x8c, 0x82, 0x73, 0x5f,
+	0x02, 0x23, 0x2d, 0x8c, 0x82, 0x82, 0x6e, 0x02,
+	0x23, 0x3c, 0x8c, 0x82, 0x78, 0x69, 0x02, 0x23,
+	0x4b, 0x8c, 0x82, 0x73, 0x5f, 0x02, 0x23, 0x5a,
+	0x8c, 0x82, 0x69, 0x55, 0x03, 0x3d, 0x2d, 0x8c,
+	0x82, 0x82, 0x82, 0x03, 0x3d, 0x3c, 0x8c, 0x82,
+	0x82, 0x82, 0x03, 0x3d, 0x4b, 0x8c, 0x82, 0x82,
+	0x82, 0x03, 0x3d, 0x5a, 0x8c, 0x82, 0x82, 0x82,
+	0x03, 0x32, 0x2d, 0x8c, 0x82, 0x82, 0x82, 0x03,
+	0x32, 0x3c, 0x8c, 0x82, 0x82, 0x82, 0x03, 0x32,
+	0x4b, 0x8c, 0x82, 0x82, 0x73, 0x03, 0x32, 0x5a,
+	0x8c, 0x82, 0x82, 0x6e, 0x03, 0x28, 0x2d, 0x8c,
+	0x82, 0x82, 0x78, 0x03, 0x28, 0x3c, 0x8c, 0x82,
+	0x82, 0x73, 0x03, 0x28, 0x4b, 0x8c, 0x82, 0x7d,
+	0x6e, 0x03, 0x28, 0x5a, 0x8c, 0x82, 0x73, 0x5f,
+	0x03, 0x23, 0x2d, 0x8c, 0x82, 0x82, 0x6e, 0x03,
+	0x23, 0x3c, 0x8c, 0x82, 0x78, 0x6e, 0x03, 0x23,
+	0x4b, 0x8c, 0x82, 0x78, 0x5f, 0x03, 0x23, 0x5a,
+	0x8c, 0x82, 0x6e, 0x5a,
+};
+
+
+/*
+ * "Safe entry" to be used when no match for speedo_id /
+ * regulator_cur is found; must be the last one
+ */
+static struct tegra_edp_limits edp_default_limits[] = {
+	{90, {1000000, 1000000, 1000000, 1000000} },
+};
+
+
+
+/*
+ * Specify regulator current in mA, e.g. 5000mA
+ * Use 0 for default
+ */
+void __init tegra_init_cpu_edp_limits(unsigned int regulator_mA)
+{
+	int cpu_speedo_id = tegra_cpu_speedo_id();
+	int i, j;
+	struct tegra_edp_limits *e;
+	struct tegra_edp_entry *t = (struct tegra_edp_entry *)tegra_edp_map;
+	int tsize = sizeof(tegra_edp_map)/sizeof(struct tegra_edp_entry);
+
+	if (!regulator_mA) {
+		edp_limits = edp_default_limits;
+		edp_limits_size = ARRAY_SIZE(edp_default_limits);
+		return;
+	}
+
+	for (i = 0; i < tsize; i++) {
+		if (t[i].speedo_id == cpu_speedo_id &&
+		    t[i].regulator_100mA <= regulator_mA / 100)
+			break;
+	}
+
+	/* No entry found in tegra_edp_map */
+	if (i >= tsize) {
+		edp_limits = edp_default_limits;
+		edp_limits_size = ARRAY_SIZE(edp_default_limits);
+		return;
+	}
+
+	/* Find all rows for this entry */
+	for (j = i + 1; j < tsize; j++) {
+		if (t[i].speedo_id != t[j].speedo_id ||
+		    t[i].regulator_100mA != t[j].regulator_100mA)
+			break;
+	}
+
+	edp_limits_size = j - i;
+	e = kmalloc(sizeof(struct tegra_edp_limits) * edp_limits_size,
+		    GFP_KERNEL);
+	BUG_ON(!e);
+
+	for (j = 0; j < edp_limits_size; j++) {
+		e[j].temperature = (int)t[i+j].temperature;
+		e[j].freq_limits[0] = (unsigned int)t[i+j].freq_limits[0] * 10000;
+		e[j].freq_limits[1] = (unsigned int)t[i+j].freq_limits[1] * 10000;
+		e[j].freq_limits[2] = (unsigned int)t[i+j].freq_limits[2] * 10000;
+		e[j].freq_limits[3] = (unsigned int)t[i+j].freq_limits[3] * 10000;
+	}
+
+	if (edp_limits && edp_limits != edp_default_limits)
+		kfree(edp_limits);
+
+	edp_limits = e;
+}
+
+void tegra_get_cpu_edp_limits(const struct tegra_edp_limits **limits, int *size)
+{
+	*limits = edp_limits;
+	*size = edp_limits_size;
+}
+
+#ifdef CONFIG_DEBUG_FS
+
+static int edp_debugfs_show(struct seq_file *s, void *data)
+{
+	int i;
+	const struct tegra_edp_limits *limits;
+	int size;
+
+	tegra_get_cpu_edp_limits(&limits, &size);
+
+	seq_printf(s, "-- EDP table --\n");
+	for (i = 0; i < size; i++) {
+		seq_printf(s, "%4dC: %10d %10d %10d %10d\n",
+			   limits[i].temperature,
+			   limits[i].freq_limits[0],
+			   limits[i].freq_limits[1],
+			   limits[i].freq_limits[2],
+			   limits[i].freq_limits[3]);
+	}
+
+	return 0;
+}
+
+
+static int edp_debugfs_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, edp_debugfs_show, inode->i_private);
+}
+
+
+static const struct file_operations edp_debugfs_fops = {
+	.open		= edp_debugfs_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+
+static int __init tegra_edp_debugfs_init()
+{
+	struct dentry *d;
+
+	d = debugfs_create_file("edp", S_IRUGO, NULL, NULL,
+				&edp_debugfs_fops);
+	if (!d)
+		return -ENOMEM;
+
+	return 0;
+}
+
+late_initcall(tegra_edp_debugfs_init);
+#endif /* CONFIG_DEBUG_FS */