1 files changed, 64 insertions, 0 deletions
diff --git a/include/video/sgx-util.h b/include/video/sgx-util.h
new file mode 100644
index 00000000000..4a5bd7ff50a
--- /dev/null
+++ b/include/video/sgx-util.h
@@ -0,0 +1,64 @@
+/*
+ * SGX utility functions
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * 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.
+ */
+
+#ifndef __SGX_UTIL_H
+#define __SGX_UTIL_H
+
+#include <linux/kernel.h>
+
+#define OMAPLFB_PAGE_SIZE 4096
+
+/* Greatest common divisor */
+static unsigned long gcd(unsigned long a, unsigned long b)
+{
+	unsigned long r;
+
+	if (a < b) {
+		r = a;
+		a = b;
+		b = r;
+	}
+
+	while ((r = a % b) != 0) {
+		a = b;
+		b = r;
+	}
+
+	return b;
+}
+
+/*
+ * Workout the smallest size that is aligned to both 4K (for the SGX)
+ * and line length (for the fbdev driver).
+ */
+static unsigned int sgx_buffer_align(unsigned stride, unsigned size)
+{
+	unsigned lcm;
+
+	if (!stride || !size)
+		return 0;
+
+	lcm = stride * OMAPLFB_PAGE_SIZE / gcd(stride,
+					       OMAPLFB_PAGE_SIZE);
+
+	return roundup(size, lcm);
+}
+
+#endif /* __SGX_UTIL_H */