crypto: caam - hwrng support

caam_read copies random bytes from two buffers into output.

caam rng can fill empty buffer 0xffff bytes at a time,
but the buffer sizes are rounded down to multiple of cacheline size.

Signed-off-by: Yuan Kang <Yuan.Kang@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/crypto/caam/Kconfig b/drivers/crypto/caam/Kconfig
index e61b7f50785e..502a7f3cca5f 100644
--- a/drivers/crypto/caam/Kconfig
+++ b/drivers/crypto/caam/Kconfig
@@ -82,3 +82,16 @@ config CRYPTO_DEV_FSL_CAAM_AHASH_API
 
           To compile this as a module, choose M here: the module
           will be called caamhash.
+
+config CRYPTO_DEV_FSL_CAAM_RNG_API
+        tristate "Register caam device for hwrng API"
+        depends on CRYPTO_DEV_FSL_CAAM
+        default y
+        select CRYPTO_RNG
+        select HW_RANDOM
+        help
+          Selecting this will register the SEC4 hardware rng to
+          the hw_random API for suppying the kernel entropy pool.
+
+          To compile this as a module, choose M here: the module
+          will be called caamrng.