crypto: aspeed - Add ACRY RSA driver

ACRY Engine is designed to accelerate the throughput of
ECDSA/RSA signature and verification.

This patch aims to add ACRY RSA engine driver for hardware
acceleration.

Signed-off-by: Neal Liu <neal_liu@aspeedtech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/aspeed/Kconfig

@@ -46,3 +46,14 @@ config CRYPTO_DEV_ASPEED_HACE_CRYPTO
 	  crypto driver.
 	  Supports AES/DES symmetric-key encryption and decryption
 	  with ECB/CBC/CFB/OFB/CTR options.
+
+config CRYPTO_DEV_ASPEED_ACRY
+	bool "Enable Aspeed ACRY RSA Engine"
+	depends on CRYPTO_DEV_ASPEED
+	select CRYPTO_ENGINE
+	select CRYPTO_RSA
+	help
+	  Select here to enable Aspeed ECC/RSA Engine (ACRY)
+	  RSA driver.
+	  Supports 256 bits to 4096 bits RSA encryption/decryption
+	  and signature/verification.

drivers/crypto/aspeed/Makefile

@@ -5,3 +5,5 @@ obj-$(CONFIG_CRYPTO_DEV_ASPEED) += aspeed_crypto.o
 aspeed_crypto-objs := aspeed-hace.o	\
 		      $(hace-hash-y)	\
 		      $(hace-crypto-y)
+
+obj-$(CONFIG_CRYPTO_DEV_ASPEED_ACRY) += aspeed-acry.o