Commit 56c6da16 authored by Weili Qian's avatar Weili Qian Committed by Herbert Xu
Browse files

crypto: hisilicon/trng - add HiSilicon TRNG driver support 



Move existing char/hw_random/hisi-trng-v2.c to crypto/hisilicon/trng.c.

Signed-off-by: default avatarWeili Qian <qianweili@huawei.com>
Reviewed-by: default avatarZaibo Xu <xuzaibo@huawei.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 4e0b858b

arch/arm64/configs/defconfig

+1 −0
Original line number Diff line number Diff line
@@ -1081,6 +1081,7 @@ CONFIG_CRYPTO_DEV_CCREE=m 
CONFIG_CRYPTO_DEV_HISI_SEC2=m

CONFIG_CRYPTO_DEV_HISI_ZIP=m

CONFIG_CRYPTO_DEV_HISI_HPRE=m

CONFIG_CRYPTO_DEV_HISI_TRNG=m

CONFIG_CMA_SIZE_MBYTES=32

CONFIG_PRINTK_TIME=y

CONFIG_DEBUG_INFO=y

drivers/crypto/hisilicon/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -71,3 +71,10 @@ config CRYPTO_DEV_HISI_HPRE 
	help

	  Support for HiSilicon HPRE(High Performance RSA Engine)

	  accelerator, which can accelerate RSA and DH algorithms.



config CRYPTO_DEV_HISI_TRNG

	tristate "Support for HISI TRNG Driver"

	depends on ARM64 && ACPI

	select HW_RANDOM

	help

	  Support for HiSilicon TRNG Driver.

drivers/crypto/hisilicon/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,3 +5,4 @@ obj-$(CONFIG_CRYPTO_DEV_HISI_SEC2) += sec2/ 
obj-$(CONFIG_CRYPTO_DEV_HISI_QM) += hisi_qm.o

hisi_qm-objs = qm.o sgl.o

obj-$(CONFIG_CRYPTO_DEV_HISI_ZIP) += zip/

obj-$(CONFIG_CRYPTO_DEV_HISI_TRNG) += trng/

drivers/crypto/hisilicon/trng/Makefile

0 → 100644
+2 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_CRYPTO_DEV_HISI_TRNG) += hisi-trng-v2.o

hisi-trng-v2-objs = trng.o

drivers/crypto/hisilicon/trng/trng.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");