hwrng: ingenic - Add hardware TRNG for Ingenic X1830 (406346d2) · Commits · EulixOS / Software / Kernel

drivers/char/hw_random/Kconfig

+14 −0

Original line number	Diff line number	Diff line
		@@ -282,6 +282,20 @@ config HW_RANDOM_INGENIC_RNG

		If unsure, say Y.

		config HW_RANDOM_INGENIC_TRNG
		tristate "Ingenic True Random Number Generator support"
		depends on HW_RANDOM
		depends on MACH_X1830
		default HW_RANDOM
		help
		This driver provides kernel-side support for the True Random Number Generator
		hardware found in ingenic X1830 SoC. YSH & ATIL CU1830-Neo uses X1830 SoC.

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

		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
		@@ -24,6 +24,7 @@ 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-$(CONFIG_HW_RANDOM_INGENIC_TRNG) += ingenic-trng.o
		obj-$(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-trng.c

0 → 100644

+161 −0

Original line number	Diff line number	Diff line
		// 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/module.h>
		#include <linux/of_device.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_RDY_CLR BIT(12)
		#define CFG_INT_MASK BIT(11)
		#define CFG_GEN_EN BIT(0)

		/* bits within the STATUS register */
		#define STATUS_RANDOM_RDY BIT(0)

		struct ingenic_trng {
		void __iomem *base;
		struct clk *clk;
		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;
		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)) {
		pr_err("%s: Failed to map DTRNG registers\n", __func__);
		ret = PTR_ERR(trng->base);
		return PTR_ERR(trng->base);
		}

		trng->clk = devm_clk_get(&pdev->dev, NULL);
		if (IS_ERR(trng->clk)) {
		ret = PTR_ERR(trng->clk);
		pr_crit("%s: Cannot get DTRNG clock\n", __func__);
		return PTR_ERR(trng->clk);
		}

		ret = clk_prepare_enable(trng->clk);
		if (ret) {
		pr_crit("%s: Unable to enable DTRNG clock\n", __func__);
		return ret;
		}

		trng->rng.name = pdev->name;
		trng->rng.init = ingenic_trng_init;
		trng->rng.cleanup = ingenic_trng_cleanup;
		trng->rng.read = ingenic_trng_read;

		ret = hwrng_register(&trng->rng);
		if (ret) {
		dev_err(&pdev->dev, "Failed to register hwrng\n");
		return ret;
		}

		platform_set_drvdata(pdev, trng);

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

		static int ingenic_trng_remove(struct platform_device *pdev)
		{
		struct ingenic_trng *trng = platform_get_drvdata(pdev);
		unsigned int ctrl;

		hwrng_unregister(&trng->rng);

		ctrl = readl(trng->base + TRNG_REG_CFG_OFFSET);
		ctrl &= ~CFG_GEN_EN;
		writel(ctrl, trng->base + TRNG_REG_CFG_OFFSET);

		clk_disable_unprepare(trng->clk);

		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,
		.remove = ingenic_trng_remove,
		.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");