[PATCH v1 1/3] crypto/fsl: allow accessing Job Ring from non-TrustZone

[Emanuele Ghidoli]

From: Emanuele Ghidoli <emanuele.ghidoli at toradex.com>

Add a new kconfig option to allow non-secure world access
to the CAAM Job Ring.
This is needed, for example, when running linux without
OP-TEE services, as it's done on Colibri iMX7.

Fixes: 51f1357f3428 ("Revert "drivers/crypto/fsl: assign job-rings to non-TrustZone"")
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli at toradex.com>
---
 drivers/crypto/fsl/Kconfig |  7 +++++++
 drivers/crypto/fsl/jr.c    | 19 +++++++++++++++++++
 drivers/crypto/fsl/jr.h    |  2 ++
 3 files changed, 28 insertions(+)

diff --git a/drivers/crypto/fsl/Kconfig b/drivers/crypto/fsl/Kconfig
index eaad19633f1d..e95675ee3e8e 100644
--- a/drivers/crypto/fsl/Kconfig
+++ b/drivers/crypto/fsl/Kconfig
@@ -62,6 +62,13 @@ config SYS_FSL_SEC_LE
 
 if FSL_CAAM
 
+config FSL_CAAM_JR_NTZ_ACCESS
+	bool "Give caam Job Ring access to non-secure world"
+	default n
+	help
+	  It is needed when OP-TEE is not used and Freescale CAAM Job Ring linux
+	  driver is used.
+
 config FSL_CAAM_RNG
 	bool "Enable Random Number Generator support"
 	depends on DM_RNG
diff --git a/drivers/crypto/fsl/jr.c b/drivers/crypto/fsl/jr.c
index ceb66dd6270d..203f16252159 100644
--- a/drivers/crypto/fsl/jr.c
+++ b/drivers/crypto/fsl/jr.c
@@ -673,6 +673,21 @@ static int rng_init(uint8_t sec_idx, ccsr_sec_t *sec)
 	return ret;
 }
 
+#if CONFIG_IS_ENABLED(FSL_CAAM_JR_NTZ_ACCESS)
+static void jr_setown_non_trusted(ccsr_sec_t *sec)
+{
+	u32 jrown_ns;
+	int i;
+
+	/* Set ownership of job rings to non-TrustZone mode */
+	for (i = 0; i < ARRAY_SIZE(sec->jrliodnr); i++) {
+		jrown_ns = sec_in32(&sec->jrliodnr[i].ms);
+		jrown_ns |= JROWN_NS | JRMID_NS;
+		sec_out32(&sec->jrliodnr[i].ms, jrown_ns);
+	}
+}
+#endif
+
 int sec_init_idx(uint8_t sec_idx)
 {
 	int ret = 0;
@@ -761,6 +776,10 @@ int sec_init_idx(uint8_t sec_idx)
 #if CONFIG_IS_ENABLED(OF_CONTROL)
 init:
 #endif
+#if CONFIG_IS_ENABLED(FSL_CAAM_JR_NTZ_ACCESS)
+	jr_setown_non_trusted(sec);
+#endif
+
 	ret = jr_init(sec_idx, caam);
 	if (ret < 0) {
 		printf("SEC%u:  initialization failed\n", sec_idx);
diff --git a/drivers/crypto/fsl/jr.h b/drivers/crypto/fsl/jr.h
index 4e4c4af5805f..b136cd8d05a9 100644
--- a/drivers/crypto/fsl/jr.h
+++ b/drivers/crypto/fsl/jr.h
@@ -37,6 +37,8 @@
 #define JRNSLIODN_MASK		0x0fff0000
 #define JRSLIODN_SHIFT		0
 #define JRSLIODN_MASK		0x00000fff
+#define JROWN_NS		0x00000008
+#define JRMID_NS		0x00000001
 
 #define JRDID_MS_PRIM_DID	BIT(0)
 #define JRDID_MS_PRIM_TZ	BIT(4)
-- 
2.34.1