crypto: atmel-aes - add support to the XTS mode

This patch adds the xts(aes) algorithm, which is supported from
hardware version 0x500 and above (sama5d2x).

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/atmel-aes-regs.h

@@ -28,6 +28,7 @@
 #define AES_MR_OPMOD_CFB		(0x3 << 12)
 #define AES_MR_OPMOD_CTR		(0x4 << 12)
 #define AES_MR_OPMOD_GCM		(0x5 << 12)
+#define AES_MR_OPMOD_XTS		(0x6 << 12)
 #define AES_MR_LOD				(0x1 << 15)
 #define AES_MR_CFBS_MASK		(0x7 << 16)
 #define AES_MR_CFBS_128b		(0x0 << 16)
@@ -67,6 +68,9 @@
 #define AES_CTRR	0x98
 #define AES_GCMHR(x)	(0x9c + ((x) * 0x04))
 
+#define AES_TWR(x)	(0xc0 + ((x) * 0x04))
+#define AES_ALPHAR(x)	(0xd0 + ((x) * 0x04))
+
 #define AES_HW_VERSION	0xFC
 
 #endif /* __ATMEL_AES_REGS_H__ */