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hwrng: hisi - remove HiSilicon TRNG driver 

Driver of HiSilicon true random number generator(TRNG)
is removed from 'drivers/char/hw_random'.

Both 'Kunpeng 920' and 'Kunpeng 930' chips have TRNG,
however, PRNG is only supported by 'Kunpeng 930'.
So, this driver is moved to 'drivers/crypto/hisilicon/trng/'
in the next to enable the two's TRNG better.

Signed-off-by: Weili Qian <qianweili@huawei.com>
Reviewed-by: Zaibo Xu <xuzaibo@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Weili Qian 2020-11-20 17:02:31 +08:00 committed by Herbert Xu
parent 6cf1a144d3
commit 4e0b858b1a
3 changed files with 0 additions and 113 deletions
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13
drivers/char/hw_random/Kconfig
View File

@ -348,19 +348,6 @@ 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

1
drivers/char/hw_random/Makefile
View File

@ -30,7 +30,6 @@ 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

99
drivers/char/hw_random/hisi-trng-v2.c
View File

@ -1,99 +0,0 @@
// 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");