hwrng: hisi - add HiSilicon TRNG driver support (3e90efd1) · Commits · 戴 / test

drivers/char/hw_random/Kconfig

+13 −0

Original line number	Diff line number	Diff line
		@@ -308,6 +308,19 @@ config HW_RANDOM_HISI

		If unsure, say Y.

		config HW_RANDOM_HISI_V2
		tristate "HiSilicon True Random Number Generator V2 support"
		depends on HW_RANDOM && ARM64 && ACPI
		default HW_RANDOM
		help
		This driver provides kernel-side support for the True Random Number
		Generator V2 hardware found on HiSilicon Hi1620 SoC.

		To compile this driver as a module, choose M here: the
		module will be called hisi-trng-v2.

		If unsure, say Y.

		config HW_RANDOM_ST
		tristate "ST Microelectronics HW Random Number Generator support"
		depends on HW_RANDOM && ARCH_STI

drivers/char/hw_random/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -27,6 +27,7 @@ obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o
		obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o
		obj-$(CONFIG_HW_RANDOM_POWERNV) += powernv-rng.o
		obj-$(CONFIG_HW_RANDOM_HISI) += hisi-rng.o
		obj-$(CONFIG_HW_RANDOM_HISI_V2) += hisi-trng-v2.o
		obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o
		obj-$(CONFIG_HW_RANDOM_IPROC_RNG200) += iproc-rng200.o
		obj-$(CONFIG_HW_RANDOM_ST) += st-rng.o

drivers/char/hw_random/hisi-trng-v2.c

0 → 100644

+99 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/* Copyright (c) 2019 HiSilicon Limited. */

		#include <linux/acpi.h>
		#include <linux/err.h>
		#include <linux/hw_random.h>
		#include <linux/io.h>
		#include <linux/iopoll.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/random.h>

		#define HISI_TRNG_REG 0x00F0
		#define HISI_TRNG_BYTES 4
		#define HISI_TRNG_QUALITY 512
		#define SLEEP_US 10
		#define TIMEOUT_US 10000

		struct hisi_trng {
		void __iomem *base;
		struct hwrng rng;
		};

		static int hisi_trng_read(struct hwrng rng, void buf, size_t max, bool wait)
		{
		struct hisi_trng *trng;
		int currsize = 0;
		u32 val = 0;
		u32 ret;

		trng = container_of(rng, struct hisi_trng, rng);

		do {
		ret = readl_poll_timeout(trng->base + HISI_TRNG_REG, val,
		val, SLEEP_US, TIMEOUT_US);
		if (ret)
		return currsize;

		if (max - currsize >= HISI_TRNG_BYTES) {
		memcpy(buf + currsize, &val, HISI_TRNG_BYTES);
		currsize += HISI_TRNG_BYTES;
		if (currsize == max)
		return currsize;
		continue;
		}

		/* copy remaining bytes */
		memcpy(buf + currsize, &val, max - currsize);
		currsize = max;
		} while (currsize < max);

		return currsize;
		}

		static int hisi_trng_probe(struct platform_device *pdev)
		{
		struct hisi_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))
		return PTR_ERR(trng->base);

		trng->rng.name = pdev->name;
		trng->rng.read = hisi_trng_read;
		trng->rng.quality = HISI_TRNG_QUALITY;

		ret = devm_hwrng_register(&pdev->dev, &trng->rng);
		if (ret)
		dev_err(&pdev->dev, "failed to register hwrng!\n");

		return ret;
		}

		static const struct acpi_device_id hisi_trng_acpi_match[] = {
		{ "HISI02B3", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(acpi, hisi_trng_acpi_match);

		static struct platform_driver hisi_trng_driver = {
		.probe = hisi_trng_probe,
		.driver = {
		.name = "hisi-trng-v2",
		.acpi_match_table = ACPI_PTR(hisi_trng_acpi_match),
		},
		};

		module_platform_driver(hisi_trng_driver);

		MODULE_LICENSE("GPL v2");
		MODULE_AUTHOR("Weili Qian <qianweili@huawei.com>");
		MODULE_AUTHOR("Zaibo Xu <xuzaibo@huawei.com>");
		MODULE_DESCRIPTION("HiSilicon true random number generator V2 driver");

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