Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 149 insertions, 0 deletions

diff --git a/drivers/char/hw_random/ingenic-rng.c b/drivers/char/hw_random/ingenic-rng.c
new file mode 100644
index 0000000000..4f18c3fa54
--- /dev/null
+++ b/drivers/char/hw_random/ingenic-rng.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Ingenic Random Number Generator driver
+ * Copyright (c) 2017 PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
+ * Copyright (c) 2020 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
+ */
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* RNG register offsets */
+#define RNG_REG_ERNG_OFFSET		0x0
+#define RNG_REG_RNG_OFFSET		0x4
+
+/* bits within the ERND register */
+#define ERNG_READY				BIT(31)
+#define ERNG_ENABLE				BIT(0)
+
+enum ingenic_rng_version {
+	ID_JZ4780,
+	ID_X1000,
+};
+
+/* Device associated memory */
+struct ingenic_rng {
+	enum ingenic_rng_version version;
+
+	void __iomem *base;
+	struct hwrng rng;
+};
+
+static int ingenic_rng_init(struct hwrng *rng)
+{
+	struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);
+
+	writel(ERNG_ENABLE, priv->base + RNG_REG_ERNG_OFFSET);
+
+	return 0;
+}
+
+static void ingenic_rng_cleanup(struct hwrng *rng)
+{
+	struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);
+
+	writel(0, priv->base + RNG_REG_ERNG_OFFSET);
+}
+
+static int ingenic_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);
+	u32 *data = buf;
+	u32 status;
+	int ret;
+
+	if (priv->version >= ID_X1000) {
+		ret = readl_poll_timeout(priv->base + RNG_REG_ERNG_OFFSET, status,
+					 status & ERNG_READY, 10, 1000);
+		if (ret == -ETIMEDOUT) {
+			pr_err("%s: Wait for RNG data ready timeout\n", __func__);
+			return ret;
+		}
+	} else {
+		/*
+		 * A delay is required so that the current RNG data is not bit shifted
+		 * version of previous RNG data which could happen if random data is
+		 * read continuously from this device.
+		 */
+		udelay(20);
+	}
+
+	*data = readl(priv->base + RNG_REG_RNG_OFFSET);
+
+	return 4;
+}
+
+static int ingenic_rng_probe(struct platform_device *pdev)
+{
+	struct ingenic_rng *priv;
+	int ret;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base)) {
+		pr_err("%s: Failed to map RNG registers\n", __func__);
+		return PTR_ERR(priv->base);
+	}
+
+	priv->version = (enum ingenic_rng_version)(uintptr_t)of_device_get_match_data(&pdev->dev);
+
+	priv->rng.name = pdev->name;
+	priv->rng.init = ingenic_rng_init;
+	priv->rng.cleanup = ingenic_rng_cleanup;
+	priv->rng.read = ingenic_rng_read;
+
+	ret = hwrng_register(&priv->rng);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register hwrng\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	dev_info(&pdev->dev, "Ingenic RNG driver registered\n");
+	return 0;
+}
+
+static int ingenic_rng_remove(struct platform_device *pdev)
+{
+	struct ingenic_rng *priv = platform_get_drvdata(pdev);
+
+	hwrng_unregister(&priv->rng);
+
+	writel(0, priv->base + RNG_REG_ERNG_OFFSET);
+
+	return 0;
+}
+
+static const struct of_device_id ingenic_rng_of_match[] = {
+	{ .compatible = "ingenic,jz4780-rng", .data = (void *) ID_JZ4780 },
+	{ .compatible = "ingenic,x1000-rng", .data = (void *) ID_X1000 },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ingenic_rng_of_match);
+
+static struct platform_driver ingenic_rng_driver = {
+	.probe		= ingenic_rng_probe,
+	.remove		= ingenic_rng_remove,
+	.driver		= {
+		.name	= "ingenic-rng",
+		.of_match_table = ingenic_rng_of_match,
+	},
+};
+
+module_platform_driver(ingenic_rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>");
+MODULE_AUTHOR("周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>");
+MODULE_DESCRIPTION("Ingenic Random Number Generator driver");