linux-kernel - [PATCH v4 1/2] caam: init-clk based on caam-page0-access

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Message-Id: <20240429062855.923595-4-pankaj.gupta@nxp.com>
Date: Mon, 29 Apr 2024 11:58:53 +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 v4 1/2] caam: init-clk based on caam-page0-access

CAAM clock initializat is done based on the basis of soc specific
info stored in struct caam_imx_data:
- caam-page0-access flag
- num_clks

CAAM driver needs to be aware of access rights to CAAM control page
i.e., page0, to do things differently.

Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
Reviewed-by: Gaurav Jain <gaurav.jain@....com>
---
 drivers/crypto/caam/ctrl.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index bdf367f3f679..02363c467cf3 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -512,6 +512,7 @@ static const struct of_device_id caam_match[] = {
 MODULE_DEVICE_TABLE(of, caam_match);
 
 struct caam_imx_data {
+	bool page0_access;
 	const struct clk_bulk_data *clks;
 	int num_clks;
 };
@@ -524,6 +525,7 @@ static const struct clk_bulk_data caam_imx6_clks[] = {
 };
 
 static const struct caam_imx_data caam_imx6_data = {
+	.page0_access = true,
 	.clks = caam_imx6_clks,
 	.num_clks = ARRAY_SIZE(caam_imx6_clks),
 };
@@ -534,6 +536,7 @@ static const struct clk_bulk_data caam_imx7_clks[] = {
 };
 
 static const struct caam_imx_data caam_imx7_data = {
+	.page0_access = true,
 	.clks = caam_imx7_clks,
 	.num_clks = ARRAY_SIZE(caam_imx7_clks),
 };
@@ -545,6 +548,7 @@ static const struct clk_bulk_data caam_imx6ul_clks[] = {
 };
 
 static const struct caam_imx_data caam_imx6ul_data = {
+	.page0_access = true,
 	.clks = caam_imx6ul_clks,
 	.num_clks = ARRAY_SIZE(caam_imx6ul_clks),
 };
@@ -554,6 +558,7 @@ static const struct clk_bulk_data caam_vf610_clks[] = {
 };
 
 static const struct caam_imx_data caam_vf610_data = {
+	.page0_access = true,
 	.clks = caam_vf610_clks,
 	.num_clks = ARRAY_SIZE(caam_vf610_clks),
 };
@@ -860,6 +865,7 @@ static int caam_probe(struct platform_device *pdev)
 	int pg_size;
 	int BLOCK_OFFSET = 0;
 	bool reg_access = true;
+	const struct caam_imx_data *imx_soc_data;
 
 	ctrlpriv = devm_kzalloc(&pdev->dev, sizeof(*ctrlpriv), GFP_KERNEL);
 	if (!ctrlpriv)
@@ -894,12 +900,20 @@ static int caam_probe(struct platform_device *pdev)
 			return -EINVAL;
 		}
 
+		imx_soc_data = imx_soc_match->data;
+		reg_access = reg_access && imx_soc_data->page0_access;
+		/*
+		 * CAAM clocks cannot be controlled from kernel.
+		 */
+		if (!imx_soc_data->num_clks)
+			goto iomap_ctrl;
+
 		ret = init_clocks(dev, imx_soc_match->data);
 		if (ret)
 			return ret;
 	}
 
-
+iomap_ctrl:
 	/* Get configuration properties from device tree */
 	/* First, get register page */
 	ctrl = devm_of_iomap(dev, nprop, 0, NULL);
-- 
2.34.1