[PATCH v3 4/5] crypto: caam - simplfy clock initialization

[Andrey Smirnov]

Simplify clock initialization code by converting it to use clk-bulk,
devres and soc_device_match() match table. No functional change
intended.

Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Cc: Chris Spencer <christopher.spencer@xxxxxxxxx>
Cc: Cory Tusar <cory.tusar@xxxxxxxx>
Cc: Chris Healy <cphealy@xxxxxxxxx>
Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Cc: Horia GeantÄ <horia.geanta@xxxxxxx>
Cc: Aymen Sghaier <aymen.sghaier@xxxxxxx>
Cc: Leonard Crestez <leonard.crestez@xxxxxxx>
Cc: linux-crypto@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 drivers/crypto/caam/ctrl.c   | 214 +++++++++++++++++------------------
 drivers/crypto/caam/intern.h |   5 -
 2 files changed, 107 insertions(+), 112 deletions(-)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index e6e2457a573e..b9655957d369 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -25,16 +25,6 @@ EXPORT_SYMBOL(caam_dpaa2);
 #include "qi.h"
 #endif
 
-/*
- * i.MX targets tend to have clock control subsystems that can
- * enable/disable clocking to our device.
- */
-static inline struct clk *caam_drv_identify_clk(struct device *dev,
-						char *clk_name)
-{
-	return caam_imx ? devm_clk_get(dev, clk_name) : NULL;
-}
-
 /*
  * Descriptor to instantiate RNG State Handle 0 in normal mode and
  * load the JDKEK, TDKEK and TDSK registers
@@ -347,13 +337,6 @@ static int caam_remove(struct platform_device *pdev)
 	/* Unmap controller region */
 	iounmap(ctrl);
 
-	/* shut clocks off before finalizing shutdown */
-	clk_disable_unprepare(ctrlpriv->caam_ipg);
-	if (ctrlpriv->caam_mem)
-		clk_disable_unprepare(ctrlpriv->caam_mem);
-	clk_disable_unprepare(ctrlpriv->caam_aclk);
-	if (ctrlpriv->caam_emi_slow)
-		clk_disable_unprepare(ctrlpriv->caam_emi_slow);
 	return 0;
 }
 
@@ -502,20 +485,113 @@ static const struct of_device_id caam_match[] = {
 };
 MODULE_DEVICE_TABLE(of, caam_match);
 
+struct clk_bulk_caam {
+	const struct clk_bulk_data *clks;
+	int num_clks;
+};
+
+static const struct clk_bulk_data caam_imx6_clks[] = {
+	{ .id = "ipg" },
+	{ .id = "mem" },
+	{ .id = "aclk" },
+	{ .id = "emi_slow" },
+};
+
+static const struct clk_bulk_caam caam_imx6_clk_data = {
+	.clks = caam_imx6_clks,
+	.num_clks = ARRAY_SIZE(caam_imx6_clks),
+};
+
+static const struct clk_bulk_data caam_imx7_clks[] = {
+	{ .id = "ipg" },
+	{ .id = "aclk" },
+};
+
+static const struct clk_bulk_caam caam_imx7_clk_data = {
+	.clks = caam_imx7_clks,
+	.num_clks = ARRAY_SIZE(caam_imx7_clks),
+};
+
+static const struct clk_bulk_data caam_imx6ul_clks[] = {
+	{ .id = "ipg" },
+	{ .id = "mem" },
+	{ .id = "aclk" },
+};
+
+static const struct clk_bulk_caam caam_imx6ul_clk_data = {
+	.clks = caam_imx6ul_clks,
+	.num_clks = ARRAY_SIZE(caam_imx6ul_clks),
+};
+
+
+static const struct soc_device_attribute imx_soc[] = {
+	{ .soc_id = "i.MX6UL", .data = &caam_imx6ul_clk_data },
+	{ .soc_id = "i.MX6*",  .data = &caam_imx6_clk_data },
+	{ .soc_id = "i.MX7*",  .data = &caam_imx7_clk_data },
+	{ .family = "Freescale i.MX" },
+};
+
+static void disable_clocks(void *private)
+{
+	struct clk_bulk_caam *context = private;
+
+	clk_bulk_disable_unprepare(context->num_clks,
+				   (struct clk_bulk_data *)context->clks);
+}
+
+static int init_clocks(struct device *dev,
+		       const struct clk_bulk_caam *data)
+{
+	struct clk_bulk_data *clks;
+	struct clk_bulk_caam *context;
+	int num_clks;
+	int ret;
+
+	num_clks = data->num_clks;
+	clks = devm_kmemdup(dev, data->clks,
+			    data->num_clks * sizeof(data->clks[0]),
+			    GFP_KERNEL);
+	if (!clks)
+		return -ENOMEM;
+
+	ret = devm_clk_bulk_get(dev, num_clks, clks);
+	if (ret) {
+		dev_err(dev,
+			"Failed to request all necessary clocks\n");
+		return ret;
+	}
+
+	ret = clk_bulk_prepare_enable(num_clks, clks);
+	if (ret) {
+		dev_err(dev,
+			"Failed to prepare/enable all necessary clocks\n");
+		return ret;
+	}
+
+	context = devm_kzalloc(dev, sizeof(*context), GFP_KERNEL);
+	if (!context)
+		return -ENOMEM;
+
+	context->num_clks = num_clks;
+	context->clks = clks;
+
+	ret = devm_add_action_or_reset(dev, disable_clocks, context);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 /* Probe routine for CAAM top (controller) level */
 static int caam_probe(struct platform_device *pdev)
 {
 	int ret, ring, gen_sk, ent_delay = RTSDCTL_ENT_DLY_MIN;
 	u64 caam_id;
-	static const struct soc_device_attribute imx_soc[] = {
-		{.family = "Freescale i.MX"},
-		{},
-	};
+	const struct soc_device_attribute *soc_attr;
 	struct device *dev;
 	struct device_node *nprop, *np;
 	struct caam_ctrl __iomem *ctrl;
 	struct caam_drv_private *ctrlpriv;
-	struct clk *clk;
 #ifdef CONFIG_DEBUG_FS
 	struct caam_perfmon *perfmon;
 #endif
@@ -532,91 +608,25 @@ static int caam_probe(struct platform_device *pdev)
 	dev_set_drvdata(dev, ctrlpriv);
 	nprop = pdev->dev.of_node;
 
-	caam_imx = (bool)soc_device_match(imx_soc);
-
-	/* Enable clocking */
-	clk = caam_drv_identify_clk(&pdev->dev, "ipg");
-	if (IS_ERR(clk)) {
-		ret = PTR_ERR(clk);
-		dev_err(&pdev->dev,
-			"can't identify CAAM ipg clk: %d\n", ret);
-		return ret;
-	}
-	ctrlpriv->caam_ipg = clk;
-
-	if (!of_machine_is_compatible("fsl,imx7d") &&
-	    !of_machine_is_compatible("fsl,imx7s") &&
-	    !of_machine_is_compatible("fsl,imx7ulp")) {
-		clk = caam_drv_identify_clk(&pdev->dev, "mem");
-		if (IS_ERR(clk)) {
-			ret = PTR_ERR(clk);
-			dev_err(&pdev->dev,
-				"can't identify CAAM mem clk: %d\n", ret);
-			return ret;
+	soc_attr = soc_device_match(imx_soc);
+	if (soc_attr) {
+		if (!soc_attr->data) {
+			dev_err(dev, "No clock data provided for i.MX SoC");
+			return -EINVAL;
 		}
-		ctrlpriv->caam_mem = clk;
-	}
 
-	clk = caam_drv_identify_clk(&pdev->dev, "aclk");
-	if (IS_ERR(clk)) {
-		ret = PTR_ERR(clk);
-		dev_err(&pdev->dev,
-			"can't identify CAAM aclk clk: %d\n", ret);
-		return ret;
-	}
-	ctrlpriv->caam_aclk = clk;
-
-	if (!of_machine_is_compatible("fsl,imx6ul") &&
-	    !of_machine_is_compatible("fsl,imx7d") &&
-	    !of_machine_is_compatible("fsl,imx7s") &&
-	    !of_machine_is_compatible("fsl,imx7ulp")) {
-		clk = caam_drv_identify_clk(&pdev->dev, "emi_slow");
-		if (IS_ERR(clk)) {
-			ret = PTR_ERR(clk);
-			dev_err(&pdev->dev,
-				"can't identify CAAM emi_slow clk: %d\n", ret);
+		ret = init_clocks(dev, soc_attr->data);
+		if (ret)
 			return ret;
-		}
-		ctrlpriv->caam_emi_slow = clk;
-	}
-
-	ret = clk_prepare_enable(ctrlpriv->caam_ipg);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "can't enable CAAM ipg clock: %d\n", ret);
-		return ret;
-	}
-
-	if (ctrlpriv->caam_mem) {
-		ret = clk_prepare_enable(ctrlpriv->caam_mem);
-		if (ret < 0) {
-			dev_err(&pdev->dev, "can't enable CAAM secure mem clock: %d\n",
-				ret);
-			goto disable_caam_ipg;
-		}
-	}
-
-	ret = clk_prepare_enable(ctrlpriv->caam_aclk);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "can't enable CAAM aclk clock: %d\n", ret);
-		goto disable_caam_mem;
-	}
-
-	if (ctrlpriv->caam_emi_slow) {
-		ret = clk_prepare_enable(ctrlpriv->caam_emi_slow);
-		if (ret < 0) {
-			dev_err(&pdev->dev, "can't enable CAAM emi slow clock: %d\n",
-				ret);
-			goto disable_caam_aclk;
-		}
 	}
+	caam_imx = (bool)soc_attr;
 
 	/* Get configuration properties from device tree */
 	/* First, get register page */
 	ctrl = of_iomap(nprop, 0);
 	if (ctrl == NULL) {
 		dev_err(dev, "caam: of_iomap() failed\n");
-		ret = -ENOMEM;
-		goto disable_caam_emi_slow;
+		return -ENOMEM;
 	}
 
 	caam_little_end = !(bool)(rd_reg32(&ctrl->perfmon.status) &
@@ -904,16 +914,6 @@ static int caam_probe(struct platform_device *pdev)
 #endif
 iounmap_ctrl:
 	iounmap(ctrl);
-disable_caam_emi_slow:
-	if (ctrlpriv->caam_emi_slow)
-		clk_disable_unprepare(ctrlpriv->caam_emi_slow);
-disable_caam_aclk:
-	clk_disable_unprepare(ctrlpriv->caam_aclk);
-disable_caam_mem:
-	if (ctrlpriv->caam_mem)
-		clk_disable_unprepare(ctrlpriv->caam_mem);
-disable_caam_ipg:
-	clk_disable_unprepare(ctrlpriv->caam_ipg);
 	return ret;
 }
 
diff --git a/drivers/crypto/caam/intern.h b/drivers/crypto/caam/intern.h
index bf115f8ddb93..81f73d32a9f8 100644
--- a/drivers/crypto/caam/intern.h
+++ b/drivers/crypto/caam/intern.h
@@ -94,11 +94,6 @@ struct caam_drv_private {
 				   Handles of the RNG4 block are initialized
 				   by this driver */
 
-	struct clk *caam_ipg;
-	struct clk *caam_mem;
-	struct clk *caam_aclk;
-	struct clk *caam_emi_slow;
-
 	/*
 	 * debugfs entries for developer view into driver/device
 	 * variables at runtime.
-- 
2.21.0