[PATCH v3 4/6] crypto/fsl: don't regenerate secure keys

[Michael Walle]

The secure keys (TDKEK, JDKEK, TDSK) can only be generated once after a
POR. Otherwise the RNG4 will throw an error.

Signed-off-by: Michael Walle <michael at walle.cc>
Reviewed-by: Horia Geantă <horia.geanta at nxp.com>
---
 drivers/crypto/fsl/jobdesc.c | 4 ++--
 drivers/crypto/fsl/jobdesc.h | 2 +-
 drivers/crypto/fsl/jr.c      | 9 +++++----
 include/fsl_sec.h            | 1 +
 4 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/crypto/fsl/jobdesc.c b/drivers/crypto/fsl/jobdesc.c
index 2f35e0c90b..6102e9c06b 100644
--- a/drivers/crypto/fsl/jobdesc.c
+++ b/drivers/crypto/fsl/jobdesc.c
@@ -258,7 +258,7 @@ void inline_cnstr_jobdesc_blob_decap(uint32_t *desc, uint8_t *key_idnfr,
  * Descriptor to instantiate RNG State Handle 0 in normal mode and
  * load the JDKEK, TDKEK and TDSK registers
  */
-void inline_cnstr_jobdesc_rng_instantiation(uint32_t *desc, int handle)
+void inline_cnstr_jobdesc_rng_instantiation(u32 *desc, int handle, int do_sk)
 {
 	u32 *jump_cmd;
 
@@ -269,7 +269,7 @@ void inline_cnstr_jobdesc_rng_instantiation(uint32_t *desc, int handle)
 			(handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INIT);
 
 	/* For SH0, Secure Keys must be generated as well */
-	if (handle == 0) {
+	if (!handle && do_sk) {
 		/* wait for done */
 		jump_cmd = append_jump(desc, JUMP_CLASS_CLASS1);
 		set_jump_tgt_here(desc, jump_cmd);
diff --git a/drivers/crypto/fsl/jobdesc.h b/drivers/crypto/fsl/jobdesc.h
index d782c46b9d..14b2a119d7 100644
--- a/drivers/crypto/fsl/jobdesc.h
+++ b/drivers/crypto/fsl/jobdesc.h
@@ -39,7 +39,7 @@ void inline_cnstr_jobdesc_blob_decap(uint32_t *desc, uint8_t *key_idnfr,
 				     uint8_t *enc_blob, uint8_t *plain_txt,
 				     uint32_t out_sz);
 
-void inline_cnstr_jobdesc_rng_instantiation(uint32_t *desc, int handle);
+void inline_cnstr_jobdesc_rng_instantiation(u32 *desc, int handle, int do_sk);
 
 void inline_cnstr_jobdesc_pkha_rsaexp(uint32_t *desc,
 				      struct pk_in_params *pkin, uint8_t *out,
diff --git a/drivers/crypto/fsl/jr.c b/drivers/crypto/fsl/jr.c
index 5275c50e8b..42865a6cd7 100644
--- a/drivers/crypto/fsl/jr.c
+++ b/drivers/crypto/fsl/jr.c
@@ -446,7 +446,7 @@ int sec_reset(void)
 	return sec_reset_idx(0);
 }
 #ifndef CONFIG_SPL_BUILD
-static int instantiate_rng(uint8_t sec_idx)
+static int instantiate_rng(u8 sec_idx, int gen_sk)
 {
 	u32 *desc;
 	u32 rdsta_val;
@@ -470,7 +470,7 @@ static int instantiate_rng(uint8_t sec_idx)
 		if (rdsta_val & (1 << sh_idx))
 			continue;
 
-		inline_cnstr_jobdesc_rng_instantiation(desc, sh_idx);
+		inline_cnstr_jobdesc_rng_instantiation(desc, sh_idx, gen_sk);
 		size = roundup(sizeof(uint32_t) * 6, ARCH_DMA_MINALIGN);
 		flush_dcache_range((unsigned long)desc,
 				   (unsigned long)desc + size);
@@ -546,12 +546,13 @@ static void kick_trng(int ent_delay, uint8_t sec_idx)
 
 static int rng_init(uint8_t sec_idx)
 {
-	int ret, ent_delay = RTSDCTL_ENT_DLY_MIN;
+	int ret, gen_sk, ent_delay = RTSDCTL_ENT_DLY_MIN;
 	ccsr_sec_t __iomem *sec = (ccsr_sec_t __iomem *)SEC_ADDR(sec_idx);
 	struct rng4tst __iomem *rng =
 			(struct rng4tst __iomem *)&sec->rng;
 	u32 inst_handles;
 
+	gen_sk = !(sec_in32(&rng->rdsta) & RDSTA_SKVN);
 	do {
 		inst_handles = sec_in32(&rng->rdsta) & RNG_STATE_HANDLE_MASK;
 
@@ -574,7 +575,7 @@ static int rng_init(uint8_t sec_idx)
 		 * interval, leading to a sucessful initialization of
 		 * the RNG.
 		 */
-		ret = instantiate_rng(sec_idx);
+		ret = instantiate_rng(sec_idx, gen_sk);
 	} while ((ret == -1) && (ent_delay < RTSDCTL_ENT_DLY_MAX));
 	if (ret) {
 		printf("SEC%u:  Failed to instantiate RNG\n", sec_idx);
diff --git a/include/fsl_sec.h b/include/fsl_sec.h
index 8dce0bbb1b..64b8751f2d 100644
--- a/include/fsl_sec.h
+++ b/include/fsl_sec.h
@@ -69,6 +69,7 @@ struct rng4tst {
 #define RNG_STATE1_HANDLE_INSTANTIATED	0x00000002
 #define RNG_STATE_HANDLE_MASK	\
 	(RNG_STATE0_HANDLE_INSTANTIATED | RNG_STATE1_HANDLE_INSTANTIATED)
+#define RDSTA_SKVN 0x40000000
 	u32 rdsta;		/*RNG DRNG Status Register*/
 	u32 rsvd2[15];
 };
-- 
2.20.1