linux-kernel - [PATCH] caam: init-clk based on caam-page0-access

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Message-Id: <20230710053418.2406915-1-pankaj.gupta@nxp.com>
Date:   Mon, 10 Jul 2023 11:04:18 +0530
From:   Pankaj Gupta <pankaj.gupta@....com>
To:     Horia GeantÄ <horia.geanta@....com>,
        Gaurav Jain <gaurav.jain@....com>,
        Varun Sethi <V.Sethi@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Iuliana Prodan <iuliana.prodan@....com>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-imx@....com, Pankaj Gupta <pankaj.gupta@....com>
Subject: [PATCH] caam: init-clk based on caam-page0-access

CAAM clock initialization to be done based on, soc specific
info stored in struct caam_imx_data:
- caam-page0-access flag
- num_clks

Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
---
 drivers/crypto/caam/ctrl.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index ff9ddbbca377..74d0b7541d54 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -511,6 +511,7 @@ 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;
 };
@@ -523,6 +524,7 @@ 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),
 };
@@ -533,6 +535,7 @@ 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),
 };
@@ -544,6 +547,7 @@ 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),
 };
@@ -553,15 +557,23 @@ 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),
 };
 
+static const struct caam_imx_data caam_imx8ulp_data = {
+	.page0_access = false,
+	.clks = NULL,
+	.num_clks = 0,
+};
+
 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 */ }
@@ -756,6 +768,7 @@ 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)
@@ -772,6 +785,15 @@ static int caam_probe(struct platform_device *pdev)
 	caam_imx = (bool)imx_soc_match;
 
 	if (imx_soc_match) {
+		if (imx_soc_match->data) {
+			imx_soc_data = imx_soc_match->data;
+			reg_access = imx_soc_data->page0_access;
+			/*
+			 * CAAM clocks cannot be controlled from kernel.
+			 */
+			if (!imx_soc_data->num_clks)
+				goto iomap_ctrl;
+		}
 		/*
 		 * Until Layerscape and i.MX OP-TEE get in sync,
 		 * only i.MX OP-TEE use cases disallow access to
@@ -781,7 +803,7 @@ static int caam_probe(struct platform_device *pdev)
 		ctrlpriv->optee_en = !!np;
 		of_node_put(np);
 
-		reg_access = !ctrlpriv->optee_en;
+		reg_access = reg_access && !ctrlpriv->optee_en;
 
 		if (!imx_soc_match->data) {
 			dev_err(dev, "No clock data provided for i.MX SoC");
@@ -793,7 +815,7 @@ static int caam_probe(struct platform_device *pdev)
 			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