crypto: ingenic - Add hardware RNG for Ingenic JZ4780 and X1000 (190873a0) · Commits · 戴 / test

drivers/char/hw_random/Kconfig

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Original line number	Diff line number	Diff line
		@@ -267,6 +267,21 @@ config HW_RANDOM_IMX_RNGC

		If unsure, say Y.

		config HW_RANDOM_INGENIC_RNG
		tristate "Ingenic Random Number Generator support"
		depends on HW_RANDOM
		depends on MACH_JZ4780 \|\| MACH_X1000
		default HW_RANDOM
		help
		This driver provides kernel-side support for the Random Number Generator
		hardware found in ingenic JZ4780 and X1000 SoC. MIPS Creator CI20 uses
		JZ4780 SoC, YSH & ATIL CU1000-Neo uses X1000 SoC.

		To compile this driver as a module, choose M here: the
		module will be called ingenic-rng.

		If unsure, say Y.

		config HW_RANDOM_NOMADIK
		tristate "ST-Ericsson Nomadik Random Number Generator support"
		depends on ARCH_NOMADIK

drivers/char/hw_random/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@ obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
		obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o
		obj-$(CONFIG_HW_RANDOM_MXC_RNGA) += mxc-rnga.o
		obj-$(CONFIG_HW_RANDOM_IMX_RNGC) += imx-rngc.o
		obj-$(CONFIG_HW_RANDOM_INGENIC_RNG) += ingenic-rng.o
		obj-$(CONFIG_HW_RANDOM_OCTEON) += octeon-rng.o
		obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o
		obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o

drivers/char/hw_random/ingenic-rng.c

0 → 100644

+154 −0

Original line number	Diff line number	Diff line
		// 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__);
		ret = PTR_ERR(priv->base);
		goto err_free_rng;
		}

		priv->version = (enum ingenic_rng_version)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");
		goto err_free_rng;
		}

		platform_set_drvdata(pdev, priv);

		dev_info(&pdev->dev, "Ingenic RNG driver registered\n");
		return 0;

		err_free_rng:
		kfree(priv);
		return ret;
		}

		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");

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