crypto: sa2ul - add sha1/sha256/sha512 support

Add support for sha1/sha256/sha512 sa2ul based hardware authentication.
With the hash update mechanism, we always use software fallback
mechanism for now, as there is no way to fetch the partial hash state
from the HW accelerator. HW accelerator is only used when digest is
called for a data chunk of known size.
Signed-off-by: Keerthy <j-keerthy@ti.com>
[t-kristo@ti.com: various bug fixes, major cleanups and refactoring of code]
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/sa2ul.h

@@ -73,7 +73,6 @@ struct sa_tfm_ctx;
 #define SA_ENG_ID_AM1   4       /* Auth. engine with SHA1/MD5/SHA2 core */
 #define SA_ENG_ID_AM2   5       /*  Authentication engine for pass 2 */
 #define SA_ENG_ID_OUTPORT2 20   /*  Egress module 2  */
-#define SA_ENG_ID_NONE  0xff
 
 /*
  * Command Label Definitions
@@ -156,6 +155,13 @@ struct sa_tfm_ctx;
 #define SA_ALIGN_MASK		(sizeof(u32) - 1)
 #define SA_ALIGNED		__aligned(32)
 
+#define SA_AUTH_SW_CTRL_MD5	1
+#define SA_AUTH_SW_CTRL_SHA1	2
+#define SA_AUTH_SW_CTRL_SHA224	3
+#define SA_AUTH_SW_CTRL_SHA256	4
+#define SA_AUTH_SW_CTRL_SHA384	5
+#define SA_AUTH_SW_CTRL_SHA512	6
+
 /* SA2UL can only handle maximum data size of 64KB */
 #define SA_MAX_DATA_SZ		U16_MAX
 
@@ -297,15 +303,31 @@ struct sa_tfm_ctx {
 	struct sa_crypto_data *dev_data;
 	struct sa_ctx_info enc;
 	struct sa_ctx_info dec;
+	struct sa_ctx_info auth;
 	int keylen;
 	int iv_idx;
 	u32 key[AES_KEYSIZE_256 / sizeof(u32)];
+	u8 authkey[SHA512_BLOCK_SIZE];
+	struct crypto_shash	*shash;
 	/* for fallback */
 	union {
 		struct crypto_sync_skcipher	*skcipher;
+		struct crypto_ahash		*ahash;
 	} fallback;
 };
 
+/**
+ * struct sa_sha_req_ctx: Structure used for sha request
+ * @dev_data: struct sa_crypto_data pointer
+ * @cmdl: Complete command label with psdata and epib included
+ * @fallback_req: SW fallback request container
+ */
+struct sa_sha_req_ctx {
+	struct sa_crypto_data	*dev_data;
+	u32			cmdl[SA_MAX_CMDL_WORDS + SA_PSDATA_CTX_WORDS];
+	struct ahash_request	fallback_req;
+};
+
 enum sa_submode {
 	SA_MODE_GEN = 0,
 	SA_MODE_CCM,