crypto: mxs - Add Freescale MXS DCP driver

Add support for the MXS DCP block. The driver currently supports
SHA-1/SHA-256 hashing and AES-128 CBC/ECB modes. The non-standard
CRC32 is not yet supported.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Documentation/devicetree/bindings/crypto/fsl-dcp.txt

+Freescale DCP (Data Co-Processor) found on i.MX23/i.MX28 .
+
+Required properties:
+- compatible : Should be "fsl,<soc>-dcp"
+- reg : Should contain MXS DCP registers location and length
+- interrupts : Should contain MXS DCP interrupt numbers, VMI IRQ and DCP IRQ
+               must be supplied, optionally Secure IRQ can be present, but
+	       is currently not implemented and not used.
+
+Example:
+
+dcp@80028000 {
+	compatible = "fsl,imx28-dcp", "fsl,imx23-dcp";
+	reg = <0x80028000 0x2000>;
+	interrupts = <52 53>;
+	status = "okay";
+};

drivers/crypto/Kconfig

@@ -401,4 +401,21 @@ if CRYPTO_DEV_CCP
 	source "drivers/crypto/ccp/Kconfig"
 endif
 
+config CRYPTO_DEV_MXS_DCP
+	tristate "Support for Freescale MXS DCP"
+	depends on ARCH_MXS
+	select CRYPTO_SHA1
+	select CRYPTO_SHA256
+	select CRYPTO_CBC
+	select CRYPTO_ECB
+	select CRYPTO_AES
+	select CRYPTO_BLKCIPHER
+	select CRYPTO_ALGAPI
+	help
+	  The Freescale i.MX23/i.MX28 has SHA1/SHA256 and AES128 CBC/ECB
+	  co-processor on the die.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called mxs-dcp.
+
 endif # CRYPTO_HW

drivers/crypto/Makefile

@@ -22,3 +22,4 @@ obj-$(CONFIG_CRYPTO_DEV_ATMEL_AES) += atmel-aes.o
 obj-$(CONFIG_CRYPTO_DEV_ATMEL_TDES) += atmel-tdes.o
 obj-$(CONFIG_CRYPTO_DEV_ATMEL_SHA) += atmel-sha.o
 obj-$(CONFIG_CRYPTO_DEV_CCP) += ccp/
+obj-$(CONFIG_CRYPTO_DEV_MXS_DCP) += mxs-dcp.o