crypto: rockchip - Check for clocks numbers and their frequencies

Add the number of clocks needed for each compatible.
Rockchip's datasheet give maximum frequencies for some clocks, so add
checks for verifying they are within limits. Let's start with rk3288 for
clock frequency check, other will came later.
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/rockchip/rk3288_crypto.c

@@ -14,10 +14,58 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/clk.h>
 #include <linux/crypto.h>
 #include <linux/reset.h>
 
+static const struct rk_variant rk3288_variant = {
+	.num_clks = 4,
+	.rkclks = {
+		{ "sclk", 150000000},
+	}
+};
+
+static const struct rk_variant rk3328_variant = {
+	.num_clks = 3,
+};
+
+static int rk_crypto_get_clks(struct rk_crypto_info *dev)
+{
+	int i, j, err;
+	unsigned long cr;
+
+	dev->num_clks = devm_clk_bulk_get_all(dev->dev, &dev->clks);
+	if (dev->num_clks < dev->variant->num_clks) {
+		dev_err(dev->dev, "Missing clocks, got %d instead of %d\n",
+			dev->num_clks, dev->variant->num_clks);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < dev->num_clks; i++) {
+		cr = clk_get_rate(dev->clks[i].clk);
+		for (j = 0; j < ARRAY_SIZE(dev->variant->rkclks); j++) {
+			if (dev->variant->rkclks[j].max == 0)
+				continue;
+			if (strcmp(dev->variant->rkclks[j].name, dev->clks[i].id))
+				continue;
+			if (cr > dev->variant->rkclks[j].max) {
+				err = clk_set_rate(dev->clks[i].clk,
+						   dev->variant->rkclks[j].max);
+				if (err)
+					dev_err(dev->dev, "Fail downclocking %s from %lu to %lu\n",
+						dev->variant->rkclks[j].name, cr,
+						dev->variant->rkclks[j].max);
+				else
+					dev_info(dev->dev, "Downclocking %s from %lu to %lu\n",
+						 dev->variant->rkclks[j].name, cr,
+						 dev->variant->rkclks[j].max);
+			}
+		}
+	}
+	return 0;
+}
+
 static int rk_crypto_enable_clk(struct rk_crypto_info *dev)
 {
 	int err;
@@ -201,8 +249,12 @@ static void rk_crypto_unregister(void)
 }
 
 static const struct of_device_id crypto_of_id_table[] = {
-	{ .compatible = "rockchip,rk3288-crypto" },
-	{ .compatible = "rockchip,rk3328-crypto" },
+	{ .compatible = "rockchip,rk3288-crypto",
+	  .data = &rk3288_variant,
+	},
+	{ .compatible = "rockchip,rk3328-crypto",
+	  .data = &rk3328_variant,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, crypto_of_id_table);
@@ -220,6 +272,15 @@ static int rk_crypto_probe(struct platform_device *pdev)
 		goto err_crypto;
 	}
 
+	crypto_info->dev = &pdev->dev;
+	platform_set_drvdata(pdev, crypto_info);
+
+	crypto_info->variant = of_device_get_match_data(&pdev->dev);
+	if (!crypto_info->variant) {
+		dev_err(&pdev->dev, "Missing variant\n");
+		return -EINVAL;
+	}
+
 	crypto_info->rst = devm_reset_control_get(dev, "crypto-rst");
 	if (IS_ERR(crypto_info->rst)) {
 		err = PTR_ERR(crypto_info->rst);
@@ -236,12 +297,9 @@ static int rk_crypto_probe(struct platform_device *pdev)
 		goto err_crypto;
 	}
 
-	crypto_info->num_clks = devm_clk_bulk_get_all(&pdev->dev,
-						      &crypto_info->clks);
-	if (crypto_info->num_clks < 3) {
-		err = -EINVAL;
+	err = rk_crypto_get_clks(crypto_info);
+	if (err)
 		goto err_crypto;
-	}
 
 	crypto_info->irq = platform_get_irq(pdev, 0);
 	if (crypto_info->irq < 0) {
@@ -259,9 +317,6 @@ static int rk_crypto_probe(struct platform_device *pdev)
 		goto err_crypto;
 	}
 
-	crypto_info->dev = &pdev->dev;
-	platform_set_drvdata(pdev, crypto_info);
-
 	crypto_info->engine = crypto_engine_alloc_init(&pdev->dev, true);
 	crypto_engine_start(crypto_info->engine);
 	init_completion(&crypto_info->complete);

drivers/crypto/rockchip/rk3288_crypto.h

@@ -188,6 +188,18 @@
 #define CRYPTO_WRITE(dev, offset, val)	  \
 		writel_relaxed((val), ((dev)->reg + (offset)))
 
+#define RK_MAX_CLKS 4
+
+struct rk_clks {
+	const char *name;
+	unsigned long max;
+};
+
+struct rk_variant {
+	int num_clks;
+	struct rk_clks rkclks[RK_MAX_CLKS];
+};
+
 struct rk_crypto_info {
 	struct device			*dev;
 	struct clk_bulk_data		*clks;
@@ -195,7 +207,7 @@ struct rk_crypto_info {
 	struct reset_control		*rst;
 	void __iomem			*reg;
 	int				irq;
-
+	const struct rk_variant *variant;
 	struct crypto_engine *engine;
 	struct completion complete;
 	int status;