MA-13831-3 [trusty] Add command to generate rng with CAAM

Add new hwcrypto command to support rng generation with CAAM.

Test: rng generated on imx8qxp_mek.

Change-Id: I756f3e99423f0f9dfc2bcd30117a3f96e9f5f2f7
Signed-off-by: Ji Luo <ji.luo@nxp.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/lib/trusty/ql-tipc/hwcrypto.c b/lib/trusty/ql-tipc/hwcrypto.c
index 02b7b198eb..ccaf18b427 100644
--- a/lib/trusty/ql-tipc/hwcrypto.c
+++ b/lib/trusty/ql-tipc/hwcrypto.c
@@ -218,3 +218,25 @@ int hwcrypto_gen_blob(uint32_t plain_pa,
                               sizeof(req), NULL, 0, false);
     return rc;
 }
+
+int hwcrypto_gen_rng(uint32_t buf, uint32_t len)
+{
+    hwcrypto_rng_msg req;
+    unsigned long start, end;
+
+    /* check the address */
+    if (buf == 0)
+        return TRUSTY_ERR_INVALID_ARGS;
+    /* fill the request buffer */
+    req.buf = buf;
+    req.len = len;
+
+    /* invalidate dcache for output buffer */
+    start = (unsigned long)buf & ~(ARCH_DMA_MINALIGN - 1);
+    end   = ALIGN((unsigned long)buf + len, ARCH_DMA_MINALIGN);
+    invalidate_dcache_range(start, end);
+
+    int rc = hwcrypto_do_tipc(HWCRYPTO_GEN_RNG, (void*)&req,
+                              sizeof(req), NULL, 0, false);
+    return rc;
+}