[v2,05/13] crypto: mips/sha256 - implement library instead of shash

diff --git a/arch/mips/cavium-octeon/Kconfig b/arch/mips/cavium-octeon/Kconfig
index 450e979ef5d9..11f4aa6e80e9 100644
--- a/arch/mips/cavium-octeon/Kconfig
+++ b/arch/mips/cavium-octeon/Kconfig
@@ -23,6 +23,12 @@  config CAVIUM_OCTEON_CVMSEG_SIZE
 	  legally range is from zero to 54 cache blocks (i.e. CVMSEG LM is
 	  between zero and 6192 bytes).
 
+config CRYPTO_SHA256_OCTEON
+	tristate
+	default CRYPTO_LIB_SHA256
+	select CRYPTO_ARCH_HAVE_LIB_SHA256
+	select CRYPTO_LIB_SHA256_GENERIC
+
 endif # CPU_CAVIUM_OCTEON
 
 if CAVIUM_OCTEON_SOC
diff --git a/arch/mips/cavium-octeon/crypto/octeon-sha256.c b/arch/mips/cavium-octeon/crypto/octeon-sha256.c
index 8e85ea65387c..f93faaf1f4af 100644
--- a/arch/mips/cavium-octeon/crypto/octeon-sha256.c
+++ b/arch/mips/cavium-octeon/crypto/octeon-sha256.c
@@ -1,8 +1,6 @@ 
 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * Cryptographic API.
- *
- * SHA-224 and SHA-256 Secure Hash Algorithm.
+ * SHA-256 Secure Hash Algorithm.
  *
  * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
  *
@@ -15,9 +13,7 @@ 
  */
 
 #include <asm/octeon/octeon.h>
-#include <crypto/internal/hash.h>
-#include <crypto/sha2.h>
-#include <crypto/sha256_base.h>
+#include <crypto/internal/sha2.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 
@@ -27,31 +23,24 @@ 
  * We pass everything as 64-bit. OCTEON can handle misaligned data.
  */
 
-static void octeon_sha256_store_hash(struct crypto_sha256_state *sctx)
+void sha256_blocks_arch(u32 state[SHA256_STATE_WORDS],
+			const u8 *data, size_t nblocks)
 {
-	u64 *hash = (u64 *)sctx->state;
+	struct octeon_cop2_state cop2_state;
+	u64 *state64 = (u64 *)state;
+	unsigned long flags;
 
-	write_octeon_64bit_hash_dword(hash[0], 0);
-	write_octeon_64bit_hash_dword(hash[1], 1);
-	write_octeon_64bit_hash_dword(hash[2], 2);
-	write_octeon_64bit_hash_dword(hash[3], 3);
-}
+	if (!octeon_has_crypto())
+		return sha256_blocks_generic(state, data, nblocks);
 
-static void octeon_sha256_read_hash(struct crypto_sha256_state *sctx)
-{
-	u64 *hash = (u64 *)sctx->state;
+	flags = octeon_crypto_enable(&cop2_state);
+	write_octeon_64bit_hash_dword(state64[0], 0);
+	write_octeon_64bit_hash_dword(state64[1], 1);
+	write_octeon_64bit_hash_dword(state64[2], 2);
+	write_octeon_64bit_hash_dword(state64[3], 3);
 
-	hash[0] = read_octeon_64bit_hash_dword(0);
-	hash[1] = read_octeon_64bit_hash_dword(1);
-	hash[2] = read_octeon_64bit_hash_dword(2);
-	hash[3] = read_octeon_64bit_hash_dword(3);
-}
-
-static void octeon_sha256_transform(struct crypto_sha256_state *sctx,
-				    const u8 *src, int blocks)
-{
 	do {
-		const u64 *block = (const u64 *)src;
+		const u64 *block = (const u64 *)data;
 
 		write_octeon_64bit_block_dword(block[0], 0);
 		write_octeon_64bit_block_dword(block[1], 1);
@@ -62,93 +51,23 @@  static void octeon_sha256_transform(struct crypto_sha256_state *sctx,
 		write_octeon_64bit_block_dword(block[6], 6);
 		octeon_sha256_start(block[7]);
 
-		src += SHA256_BLOCK_SIZE;
-	} while (--blocks);
-}
+		data += SHA256_BLOCK_SIZE;
+	} while (--nblocks);
 
-static int octeon_sha256_update(struct shash_desc *desc, const u8 *data,
-				unsigned int len)
+	state64[0] = read_octeon_64bit_hash_dword(0);
+	state64[1] = read_octeon_64bit_hash_dword(1);
+	state64[2] = read_octeon_64bit_hash_dword(2);
+	state64[3] = read_octeon_64bit_hash_dword(3);
+	octeon_crypto_disable(&cop2_state, flags);
+}
+EXPORT_SYMBOL_GPL(sha256_blocks_arch);
+
+bool sha256_is_arch_optimized(void)
 {
-	struct crypto_sha256_state *sctx = shash_desc_ctx(desc);
-	struct octeon_cop2_state state;
-	unsigned long flags;
-	int remain;
-
-	flags = octeon_crypto_enable(&state);
-	octeon_sha256_store_hash(sctx);
-
-	remain = sha256_base_do_update_blocks(desc, data, len,
-					      octeon_sha256_transform);
-
-	octeon_sha256_read_hash(sctx);
-	octeon_crypto_disable(&state, flags);
-	return remain;
+	return octeon_has_crypto();
 }
-
-static int octeon_sha256_finup(struct shash_desc *desc, const u8 *src,
-			       unsigned int len, u8 *out)
-{
-	struct crypto_sha256_state *sctx = shash_desc_ctx(desc);
-	struct octeon_cop2_state state;
-	unsigned long flags;
-
-	flags = octeon_crypto_enable(&state);
-	octeon_sha256_store_hash(sctx);
-
-	sha256_base_do_finup(desc, src, len, octeon_sha256_transform);
-
-	octeon_sha256_read_hash(sctx);
-	octeon_crypto_disable(&state, flags);
-	return sha256_base_finish(desc, out);
-}
-
-static struct shash_alg octeon_sha256_algs[2] = { {
-	.digestsize	=	SHA256_DIGEST_SIZE,
-	.init		=	sha256_base_init,
-	.update		=	octeon_sha256_update,
-	.finup		=	octeon_sha256_finup,
-	.descsize	=	sizeof(struct crypto_sha256_state),
-	.base		=	{
-		.cra_name	=	"sha256",
-		.cra_driver_name=	"octeon-sha256",
-		.cra_priority	=	OCTEON_CR_OPCODE_PRIORITY,
-		.cra_flags	=	CRYPTO_AHASH_ALG_BLOCK_ONLY,
-		.cra_blocksize	=	SHA256_BLOCK_SIZE,
-		.cra_module	=	THIS_MODULE,
-	}
-}, {
-	.digestsize	=	SHA224_DIGEST_SIZE,
-	.init		=	sha224_base_init,
-	.update		=	octeon_sha256_update,
-	.finup		=	octeon_sha256_finup,
-	.descsize	=	sizeof(struct crypto_sha256_state),
-	.base		=	{
-		.cra_name	=	"sha224",
-		.cra_driver_name=	"octeon-sha224",
-		.cra_priority	=	OCTEON_CR_OPCODE_PRIORITY,
-		.cra_flags	=	CRYPTO_AHASH_ALG_BLOCK_ONLY,
-		.cra_blocksize	=	SHA224_BLOCK_SIZE,
-		.cra_module	=	THIS_MODULE,
-	}
-} };
-
-static int __init octeon_sha256_mod_init(void)
-{
-	if (!octeon_has_crypto())
-		return -ENOTSUPP;
-	return crypto_register_shashes(octeon_sha256_algs,
-				       ARRAY_SIZE(octeon_sha256_algs));
-}
-
-static void __exit octeon_sha256_mod_fini(void)
-{
-	crypto_unregister_shashes(octeon_sha256_algs,
-				  ARRAY_SIZE(octeon_sha256_algs));
-}
-
-module_init(octeon_sha256_mod_init);
-module_exit(octeon_sha256_mod_fini);
+EXPORT_SYMBOL_GPL(sha256_is_arch_optimized);
 
 MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm (OCTEON)");
+MODULE_DESCRIPTION("SHA-256 Secure Hash Algorithm (OCTEON)");
 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
diff --git a/arch/mips/configs/cavium_octeon_defconfig b/arch/mips/configs/cavium_octeon_defconfig
index f523ee6f25bf..88ae0aa85364 100644
--- a/arch/mips/configs/cavium_octeon_defconfig
+++ b/arch/mips/configs/cavium_octeon_defconfig
@@ -157,7 +157,6 @@  CONFIG_CRYPTO_CBC=y
 CONFIG_CRYPTO_HMAC=y
 CONFIG_CRYPTO_MD5_OCTEON=y
 CONFIG_CRYPTO_SHA1_OCTEON=m
-CONFIG_CRYPTO_SHA256_OCTEON=m
 CONFIG_CRYPTO_SHA512_OCTEON=m
 CONFIG_CRYPTO_DES=y
 CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
diff --git a/arch/mips/crypto/Kconfig b/arch/mips/crypto/Kconfig
index 9db1fd6d9f0e..6bf073ae7613 100644
--- a/arch/mips/crypto/Kconfig
+++ b/arch/mips/crypto/Kconfig
@@ -22,16 +22,6 @@  config CRYPTO_SHA1_OCTEON
 
 	  Architecture: mips OCTEON
 
-config CRYPTO_SHA256_OCTEON
-	tristate "Hash functions: SHA-224 and SHA-256 (OCTEON)"
-	depends on CPU_CAVIUM_OCTEON
-	select CRYPTO_SHA256
-	select CRYPTO_HASH
-	help
-	  SHA-224 and SHA-256 secure hash algorithms (FIPS 180)
-
-	  Architecture: mips OCTEON using crypto instructions, when available
-
 config CRYPTO_SHA512_OCTEON
 	tristate "Hash functions: SHA-384 and SHA-512 (OCTEON)"
 	depends on CPU_CAVIUM_OCTEON