[ARM] tegra: add API to set memory client priority

Change-Id: Id9b157004f7364fb1f7aaffa925b710dcfb90e86
Signed-off-by: Erik Gilling <konkers@android.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/mc.c b/arch/arm/mach-tegra/mc.c
new file mode 100644
index 000000000000..513ac3f5cf4d
--- /dev/null
+++ b/arch/arm/mach-tegra/mc.c
@@ -0,0 +1,42 @@
+/*
+ * arch/arm/mach-tegra/mc.c
+ *
+ * Copyright (C) 2010 Google, Inc.
+ *
+ * Author:
+ *	Erik Gilling <konkers@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.
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/spinlock.h>
+
+#include <mach/iomap.h>
+#include <mach/mc.h>
+
+static DEFINE_SPINLOCK(tegra_mc_lock);
+
+void tegra_mc_set_priority(unsigned long client, unsigned long prio)
+{
+	unsigned long mc_base = IO_TO_VIRT(TEGRA_MC_BASE);
+	unsigned long reg = client >> 8;
+	int field = client & 0xff;
+	unsigned long val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&tegra_mc_lock, flags);
+	val = readl(mc_base + reg);
+	val &= ~(TEGRA_MC_PRIO_MASK << field);
+	val |= prio << field;
+	writel(val, mc_base + reg);
+	spin_unlock_irqrestore(&tegra_mc_lock, flags);
+}