Commit 3e90efd1 authored by Zaibo Xu's avatar Zaibo Xu Committed by Herbert Xu

hwrng: hisi - add HiSilicon TRNG driver support

This series adds HiSilicon true random number generator(TRNG)
driver in hw_random subsystem.
Signed-off-by: default avatarZaibo Xu <xuzaibo@huawei.com>
Signed-off-by: default avatarWeili Qian <qianweili@huawei.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent a9704293
......@@ -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
......
......@@ -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
......
// 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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