crypto: keembay - Add support for Keem Bay OCS AES/SM4

Add support for the AES/SM4 crypto engine included in the Offload and
Crypto Subsystem (OCS) of the Intel Keem Bay SoC, thus enabling
hardware-acceleration for the following transformations:

- ecb(aes), cbc(aes), ctr(aes), cts(cbc(aes)), gcm(aes) and cbc(aes);
  supported for 128-bit and 256-bit keys.

- ecb(sm4), cbc(sm4), ctr(sm4), cts(cbc(sm4)), gcm(sm4) and cbc(sm4);
  supported for 128-bit keys.

The driver passes crypto manager self-tests, including the extra tests
(CRYPTO_MANAGER_EXTRA_TESTS=y).

Signed-off-by: Mike Healy <mikex.healy@intel.com>
Co-developed-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
Acked-by: Mark Gross <mgross@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: mikexhealy

MAINTAINERS

@@ -8958,6 +8958,16 @@ M:	Deepak Saxena <dsaxena@plexity.net>
 S:	Maintained
 F:	drivers/char/hw_random/ixp4xx-rng.c
 
+INTEL KEEM BAY OCS AES/SM4 CRYPTO DRIVER
+M:	Daniele Alessandrelli <daniele.alessandrelli@intel.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/crypto/intel,keembay-ocs-aes.yaml
+F:	drivers/crypto/keembay/Kconfig
+F:	drivers/crypto/keembay/Makefile
+F:	drivers/crypto/keembay/keembay-ocs-aes-core.c
+F:	drivers/crypto/keembay/ocs-aes.c
+F:	drivers/crypto/keembay/ocs-aes.h
+
 INTEL MANAGEMENT ENGINE (mei)
 M:	Tomas Winkler <tomas.winkler@intel.com>
 L:	linux-kernel@vger.kernel.org

drivers/crypto/Kconfig

@@ -900,4 +900,6 @@ config CRYPTO_DEV_SA2UL
 	  used for crypto offload.  Select this if you want to use hardware
 	  acceleration for cryptographic algorithms on these devices.
 
+source "drivers/crypto/keembay/Kconfig"
+
 endif # CRYPTO_HW

drivers/crypto/Makefile

@@ -51,3 +51,4 @@ obj-$(CONFIG_CRYPTO_DEV_ARTPEC6) += axis/
 obj-$(CONFIG_CRYPTO_DEV_ZYNQMP_AES) += xilinx/
 obj-y += hisilicon/
 obj-$(CONFIG_CRYPTO_DEV_AMLOGIC_GXL) += amlogic/
+obj-y += keembay/

drivers/crypto/keembay/Kconfig

@@ -0,0 +1,39 @@
+config CRYPTO_DEV_KEEMBAY_OCS_AES_SM4
+	tristate "Support for Intel Keem Bay OCS AES/SM4 HW acceleration"
+	depends on OF || COMPILE_TEST
+	select CRYPTO_SKCIPHER
+	select CRYPTO_AEAD
+	select CRYPTO_ENGINE
+	help
+	  Support for Intel Keem Bay Offload and Crypto Subsystem (OCS) AES and
+	  SM4 cihper hardware acceleration for use with Crypto API.
+
+	  Provides HW acceleration for the following transformations:
+	  cbc(aes), ctr(aes), ccm(aes), gcm(aes), cbc(sm4), ctr(sm4), ccm(sm4)
+	  and gcm(sm4).
+
+	  Optionally, support for the following transformations can also be
+	  enabled: ecb(aes), cts(cbc(aes)), ecb(sm4) and cts(cbc(sm4)).
+
+config CRYPTO_DEV_KEEMBAY_OCS_AES_SM4_ECB
+	bool "Support for Intel Keem Bay OCS AES/SM4 ECB HW acceleration"
+	depends on CRYPTO_DEV_KEEMBAY_OCS_AES_SM4
+	help
+	  Support for Intel Keem Bay Offload and Crypto Subsystem (OCS)
+	  AES/SM4 ECB mode hardware acceleration for use with Crypto API.
+
+	  Provides OCS version of ecb(aes) and ecb(sm4)
+
+	  Intel does not recommend use of ECB mode with AES/SM4.
+
+config CRYPTO_DEV_KEEMBAY_OCS_AES_SM4_CTS
+	bool "Support for Intel Keem Bay OCS AES/SM4 CTS HW acceleration"
+	depends on CRYPTO_DEV_KEEMBAY_OCS_AES_SM4
+	help
+	  Support for Intel Keem Bay Offload and Crypto Subsystem (OCS)
+	  AES/SM4 CBC with CTS mode hardware acceleration for use with
+	  Crypto API.
+
+	  Provides OCS version of cts(cbc(aes)) and cts(cbc(sm4)).
+
+	  Intel does not recommend use of CTS mode with AES/SM4.

drivers/crypto/keembay/Makefile

@@ -0,0 +1,5 @@
+#
+# Makefile for Intel Keem Bay OCS Crypto API Linux drivers
+#
+obj-$(CONFIG_CRYPTO_DEV_KEEMBAY_OCS_AES_SM4) += keembay-ocs-aes.o
+keembay-ocs-aes-objs := keembay-ocs-aes-core.o ocs-aes.o