Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 120 insertions, 0 deletions

diff --git a/drivers/char/hw_random/pic32-rng.c b/drivers/char/hw_random/pic32-rng.c
new file mode 100644
index 0000000000..888e6f5cec
--- /dev/null
+++ b/drivers/char/hw_random/pic32-rng.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PIC32 RNG driver
+ *
+ * Joshua Henderson <joshua.henderson@microchip.com>
+ * Copyright (C) 2016 Microchip Technology Inc.  All rights reserved.
+ */
+
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define RNGCON		0x04
+#define TRNGEN		BIT(8)
+#define TRNGMOD		BIT(11)
+#define RNGSEED1	0x18
+#define RNGSEED2	0x1C
+#define RNGRCNT		0x20
+#define RCNT_MASK	0x7F
+
+struct pic32_rng {
+	void __iomem	*base;
+	struct hwrng	rng;
+};
+
+/*
+ * The TRNG can generate up to 24Mbps. This is a timeout that should be safe
+ * enough given the instructions in the loop and that the TRNG may not always
+ * be at maximum rate.
+ */
+#define RNG_TIMEOUT 500
+
+static int pic32_rng_init(struct hwrng *rng)
+{
+	struct pic32_rng *priv = container_of(rng, struct pic32_rng, rng);
+
+	/* enable TRNG in enhanced mode */
+	writel(TRNGEN | TRNGMOD, priv->base + RNGCON);
+	return 0;
+}
+
+static int pic32_rng_read(struct hwrng *rng, void *buf, size_t max,
+			  bool wait)
+{
+	struct pic32_rng *priv = container_of(rng, struct pic32_rng, rng);
+	u64 *data = buf;
+	u32 t;
+	unsigned int timeout = RNG_TIMEOUT;
+
+	do {
+		t = readl(priv->base + RNGRCNT) & RCNT_MASK;
+		if (t == 64) {
+			/* TRNG value comes through the seed registers */
+			*data = ((u64)readl(priv->base + RNGSEED2) << 32) +
+				readl(priv->base + RNGSEED1);
+			return 8;
+		}
+	} while (wait && --timeout);
+
+	return -EIO;
+}
+
+static void pic32_rng_cleanup(struct hwrng *rng)
+{
+	struct pic32_rng *priv = container_of(rng, struct pic32_rng, rng);
+
+	writel(0, priv->base + RNGCON);
+}
+
+static int pic32_rng_probe(struct platform_device *pdev)
+{
+	struct pic32_rng *priv;
+	struct clk *clk;
+
+	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))
+		return PTR_ERR(priv->base);
+
+	clk = devm_clk_get_enabled(&pdev->dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	priv->rng.name = pdev->name;
+	priv->rng.init = pic32_rng_init;
+	priv->rng.read = pic32_rng_read;
+	priv->rng.cleanup = pic32_rng_cleanup;
+
+	return devm_hwrng_register(&pdev->dev, &priv->rng);
+}
+
+static const struct of_device_id pic32_rng_of_match[] __maybe_unused = {
+	{ .compatible	= "microchip,pic32mzda-rng", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pic32_rng_of_match);
+
+static struct platform_driver pic32_rng_driver = {
+	.probe		= pic32_rng_probe,
+	.driver		= {
+		.name	= "pic32-rng",
+		.of_match_table = pic32_rng_of_match,
+	},
+};
+
+module_platform_driver(pic32_rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joshua Henderson <joshua.henderson@microchip.com>");
+MODULE_DESCRIPTION("Microchip PIC32 RNG Driver");