crypto: omap - add base support library for common routines

This contains the generic APIs for aligning SG buffers.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/omap-crypto.h

@@ -0,0 +1,37 @@
+/*
+ * OMAP Crypto driver common support routines.
+ *
+ * Copyright (c) 2017 Texas Instruments Incorporated
+ *   Tero Kristo <t-kristo@ti.com>
+ *
+ * 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 __CRYPTO_OMAP_CRYPTO_H
+#define __CRYPTO_OMAP_CRYPTO_H
+
+enum {
+	OMAP_CRYPTO_NOT_ALIGNED = 1,
+	OMAP_CRYPTO_BAD_DATA_LENGTH,
+};
+
+#define OMAP_CRYPTO_DATA_COPIED		BIT(0)
+#define OMAP_CRYPTO_SG_COPIED		BIT(1)
+
+#define OMAP_CRYPTO_COPY_MASK		0x3
+
+#define OMAP_CRYPTO_COPY_DATA		BIT(0)
+#define OMAP_CRYPTO_FORCE_COPY		BIT(1)
+#define OMAP_CRYPTO_ZERO_BUF		BIT(2)
+#define OMAP_CRYPTO_FORCE_SINGLE_ENTRY	BIT(3)
+
+int omap_crypto_align_sg(struct scatterlist **sg, int total, int bs,
+			 struct scatterlist *new_sg, u16 flags,
+			 u8 flags_shift, unsigned long *dd_flags);
+void omap_crypto_cleanup(struct scatterlist *sg, struct scatterlist *orig,
+			 int offset, int len, u8 flags_shift,
+			 unsigned long flags);
+
+#endif