kernel: package module for SafeXcel crypto engine

Supports EIP97 and EIP197 found on Armada 37xx, 7k and 8k SoCs.
Unfortunately firmware for EIP197 is not easily obtainable, therefore
to not cause lot of user requests directed at OpenWrt, package it as
module with explanation where to obtain the firmware.

Cc: Marek Behún <marek.behun@nic.cz>
Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>

package/kernel/linux/modules/crypto.mk

@@ -350,6 +350,31 @@ endef
 $(eval $(call KernelPackage,crypto-hw-padlock))
 
 
+define KernelPackage/crypto-hw-safexcel
+  TITLE:= MVEBU SafeXcel Crypto Engine module
+  DEPENDS:=@!LINUX_4_14 @(TARGET_mvebu_cortexa53||TARGET_mvebu_cortexa72) \
+	+kmod-crypto-authenc +kmod-crypto-md5 +kmod-crypto-hmac +kmod-crypto-sha256 +kmod-crypto-sha512
+  KCONFIG:= \
+	CONFIG_CRYPTO_HW=y \
+	CONFIG_CRYPTO_DEV_SAFEXCEL
+  FILES:=$(LINUX_DIR)/drivers/crypto/inside-secure/crypto_safexcel.ko
+  AUTOLOAD:=$(call AutoLoad,90,crypto_safexcel)
+  $(call AddDepends/crypto)
+endef
+
+define KernelPackage/crypto-hw-safexcel/description
+MVEBU's EIP97 and EIP197 Cryptographic Engine driver designed by
+Inside Secure. This is found on Marvell Armada 37xx/7k/8k SoCs.
+
+Particular version of these IP (EIP197B and EIP197D) require firmware.
+Unfortunately it's not freely available and needs signed Non-Disclosure
+Agreement (NDA) with Marvell. For those who have signed NDA the firmware can be
+obtained at https://extranet.marvell.com.
+endef
+
+$(eval $(call KernelPackage,crypto-hw-safexcel))
+
+
 define KernelPackage/crypto-hw-talitos
   TITLE:=Freescale integrated security engine (SEC) driver
   DEPENDS:=+kmod-crypto-manager +kmod-crypto-hash +kmod-random-core +kmod-crypto-authenc +kmod-crypto-des