cmd: blob: Instantiate RNG before running CMD_BLOB

U-Boot can instantiate CAAM RNG if needed by crypto operations.
Call sec_init() prior running a blob operation to ensure
RNG is correctly instantiated.

Make sure CAAM clock is enabled and check if a job ring is
available for that operation.

Signed-off-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>

cmd/blob.c

@@ -9,6 +9,10 @@
 #include <malloc.h>
 #include <asm/byteorder.h>
 #include <linux/compiler.h>
+#if defined(CONFIG_ARCH_MX6) || defined(CONFIG_ARCH_MX7)
+#include <fsl_sec.h>
+#include <asm/arch/clock.h>
+#endif
 
 /**
  * blob_decap() - Decapsulate the data as a blob
@@ -74,6 +78,16 @@ static int do_blob(struct cmd_tbl *cmdtp, int flag, int argc,
 	src_ptr = (uint8_t *)(uintptr_t)src_addr;
 	dst_ptr = (uint8_t *)(uintptr_t)dst_addr;
 
+#if defined(CONFIG_ARCH_MX6) || defined(CONFIG_ARCH_MX7)
+
+	hab_caam_clock_enable(1);
+
+	u32 out_jr_size = sec_in32(CONFIG_SYS_FSL_JR0_ADDR +
+				   FSL_CAAM_ORSR_JRa_OFFSET);
+	if (out_jr_size != FSL_CAAM_MAX_JR_SIZE)
+		sec_init();
+#endif
+
 	if (enc)
 		ret = blob_encap(km_ptr, src_ptr, dst_ptr, len);
 	else

include/fsl_sec.h

@@ -344,6 +344,9 @@ struct sg_entry {
 #define FSL_CAAM_MP_PRVK_BYTES		    32
 #define FSL_CAAM_MP_MES_DGST_BYTES	    32
 
+#define FSL_CAAM_ORSR_JRa_OFFSET	0x102c
+#define FSL_CAAM_MAX_JR_SIZE		4
+
 /* blob_dek:
  * Encapsulates the src in a secure blob and stores it dst
  * @src: reference to the plaintext