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path: root/drivers/char/hw_random/ingenic-trng.c
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-rw-r--r--drivers/char/hw_random/ingenic-trng.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/drivers/char/hw_random/ingenic-trng.c b/drivers/char/hw_random/ingenic-trng.c
new file mode 100644
index 0000000000..1672320e7d
--- /dev/null
+++ b/drivers/char/hw_random/ingenic-trng.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Ingenic True Random Number Generator driver
+ * Copyright (c) 2019 漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com>
+ * Copyright (c) 2020 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* DTRNG register offsets */
+#define TRNG_REG_CFG_OFFSET 0x00
+#define TRNG_REG_RANDOMNUM_OFFSET 0x04
+#define TRNG_REG_STATUS_OFFSET 0x08
+
+/* bits within the CFG register */
+#define CFG_GEN_EN BIT(0)
+
+/* bits within the STATUS register */
+#define STATUS_RANDOM_RDY BIT(0)
+
+struct ingenic_trng {
+ void __iomem *base;
+ struct hwrng rng;
+};
+
+static int ingenic_trng_init(struct hwrng *rng)
+{
+ struct ingenic_trng *trng = container_of(rng, struct ingenic_trng, rng);
+ unsigned int ctrl;
+
+ ctrl = readl(trng->base + TRNG_REG_CFG_OFFSET);
+ ctrl |= CFG_GEN_EN;
+ writel(ctrl, trng->base + TRNG_REG_CFG_OFFSET);
+
+ return 0;
+}
+
+static void ingenic_trng_cleanup(struct hwrng *rng)
+{
+ struct ingenic_trng *trng = container_of(rng, struct ingenic_trng, rng);
+ unsigned int ctrl;
+
+ ctrl = readl(trng->base + TRNG_REG_CFG_OFFSET);
+ ctrl &= ~CFG_GEN_EN;
+ writel(ctrl, trng->base + TRNG_REG_CFG_OFFSET);
+}
+
+static int ingenic_trng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+ struct ingenic_trng *trng = container_of(rng, struct ingenic_trng, rng);
+ u32 *data = buf;
+ u32 status;
+ int ret;
+
+ ret = readl_poll_timeout(trng->base + TRNG_REG_STATUS_OFFSET, status,
+ status & STATUS_RANDOM_RDY, 10, 1000);
+ if (ret == -ETIMEDOUT) {
+ pr_err("%s: Wait for DTRNG data ready timeout\n", __func__);
+ return ret;
+ }
+
+ *data = readl(trng->base + TRNG_REG_RANDOMNUM_OFFSET);
+
+ return 4;
+}
+
+static int ingenic_trng_probe(struct platform_device *pdev)
+{
+ struct ingenic_trng *trng;
+ struct clk *clk;
+ int ret;
+
+ trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
+ if (!trng)
+ return -ENOMEM;
+
+ trng->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(trng->base))
+ return dev_err_probe(&pdev->dev, PTR_ERR(trng->base),
+ "%s: Failed to map DTRNG registers\n", __func__);
+
+ clk = devm_clk_get_enabled(&pdev->dev, NULL);
+ if (IS_ERR(clk))
+ return dev_err_probe(&pdev->dev, PTR_ERR(clk),
+ "%s: Cannot get and enable DTRNG clock\n", __func__);
+
+ trng->rng.name = pdev->name;
+ trng->rng.init = ingenic_trng_init;
+ trng->rng.cleanup = ingenic_trng_cleanup;
+ trng->rng.read = ingenic_trng_read;
+
+ ret = devm_hwrng_register(&pdev->dev, &trng->rng);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret, "Failed to register hwrng\n");
+
+ platform_set_drvdata(pdev, trng);
+
+ dev_info(&pdev->dev, "Ingenic DTRNG driver registered\n");
+ return 0;
+}
+
+static const struct of_device_id ingenic_trng_of_match[] = {
+ { .compatible = "ingenic,x1830-dtrng" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ingenic_trng_of_match);
+
+static struct platform_driver ingenic_trng_driver = {
+ .probe = ingenic_trng_probe,
+ .driver = {
+ .name = "ingenic-trng",
+ .of_match_table = ingenic_trng_of_match,
+ },
+};
+
+module_platform_driver(ingenic_trng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com>");
+MODULE_AUTHOR("周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>");
+MODULE_DESCRIPTION("Ingenic True Random Number Generator driver");