linux-kernel - [PATCH v3 2/2] drivers: crypto: caam: i.MX8ULP donot have CAAM page0 access

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Date: Tue, 16 Apr 2024 11:03:03 +0530
From: Pankaj Gupta <pankaj.gupta@....com>
To: gaurav.jain@....com,
	horia.geanta@....com,
	V.Sethi@....com,
	herbert@...dor.apana.org.au,
	davem@...emloft.net,
	iuliana.prodan@....com,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-imx@....com
Cc: Pankaj Gupta <pankaj.gupta@....com>
Subject: [PATCH v3 2/2] drivers: crypto: caam: i.MX8ULP donot have CAAM page0 access

iMX8ULP have a secure-enclave hardware IP called EdgeLock Enclave(ELE),
that control access to caam controller's register page, i.e., page0.

At all, if the ELE release access to CAAM controller's register page,
it will release to secure-world only.

Clocks are turned on automatically for iMX8ULP. There exists the caam
clock gating bit, but it is not advised to gate the clock at linux, as
optee-os or any other entity might be using it.

Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
---
 drivers/crypto/caam/ctrl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 247d42aa32df..f0f87fe8ef92 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -563,11 +563,14 @@ static const struct caam_imx_data caam_vf610_data = {
 	.num_clks = ARRAY_SIZE(caam_vf610_clks),
 };
 
+static const struct caam_imx_data caam_imx8ulp_data;
+
 static const struct soc_device_attribute caam_imx_soc_table[] = {
 	{ .soc_id = "i.MX6UL", .data = &caam_imx6ul_data },
 	{ .soc_id = "i.MX6*",  .data = &caam_imx6_data },
 	{ .soc_id = "i.MX7*",  .data = &caam_imx7_data },
 	{ .soc_id = "i.MX8M*", .data = &caam_imx7_data },
+	{ .soc_id = "i.MX8ULP", .data = &caam_imx8ulp_data },
 	{ .soc_id = "VF*",     .data = &caam_vf610_data },
 	{ .family = "Freescale i.MX" },
 	{ /* sentinel */ }
-- 
2.34.1