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hwrng: histb - Move driver to drivers/char/hw_random/histb-rng.c

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Move to drivers/char/hw_random since histb-(t)rng does not provide
cryptography pseudo rng.

histb-rng is pretty like hisi-rng, but after investigation, we confirm
there is no RNG_PHY_SEED register on histb-rng so a separate driver is
needed.

Still we rename relevant function names to match those in hisi-rng.

Link: https://lore.kernel.org/r/20230401164448.1393336-1-mmyangfl@gmail.com
Signed-off-by: David Yang <mmyangfl@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
David Yang 2023-04-22 00:56:49 +08:00 committed by Herbert Xu
parent 69f1c387ba
commit 903e6ada01
6 changed files with 53 additions and 54 deletions
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11
drivers/char/hw_random/Kconfig
View File

@ -335,6 +335,17 @@ config HW_RANDOM_HISI
If unsure, say Y.
config HW_RANDOM_HISTB
tristate "Hisilicon STB Random Number Generator support"
depends on ARCH_HISI || COMPILE_TEST
default ARCH_HISI
help
This driver provides kernel-side support for the Random Number
Generator hardware found on Hisilicon Hi37xx SoC.
To compile this driver as a module, choose M here: the
module will be called histb-rng.
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

@ -29,6 +29,7 @@ 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-$(CONFIG_HW_RANDOM_HISTB) += histb-rng.o
obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o
obj-$(CONFIG_HW_RANDOM_IPROC_RNG200) += iproc-rng200.o
obj-$(CONFIG_HW_RANDOM_ST) += st-rng.o

83
drivers/crypto/hisilicon/trng/trng-stb.c → drivers/char/hw_random/histb-rng.c
View File

@ -1,31 +1,27 @@
// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
/*
* Device driver for True RNG in HiSTB SoCs
*
* Copyright (c) 2023 David Yang
*/
#include <crypto/internal/rng.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/hw_random.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#define HISTB_TRNG_CTRL 0x0
#define RNG_CTRL 0x0
#define RNG_SOURCE GENMASK(1, 0)
#define DROP_ENABLE BIT(5)
#define POST_PROCESS_ENABLE BIT(7)
#define POST_PROCESS_DEPTH GENMASK(15, 8)
#define HISTB_TRNG_NUMBER 0x4
#define HISTB_TRNG_STAT 0x8
#define RNG_NUMBER 0x4
#define RNG_STAT 0x8
#define DATA_COUNT GENMASK(2, 0) /* max 4 */
struct histb_trng_priv {
struct histb_rng_priv {
struct hwrng rng;
void __iomem *base;
};
@ -35,19 +31,19 @@ struct histb_trng_priv {
* depth = 1 -> ~1ms
* depth = 255 -> ~16ms
*/
static int histb_trng_wait(void __iomem *base)
static int histb_rng_wait(void __iomem *base)
{
u32 val;
return readl_relaxed_poll_timeout(base + HISTB_TRNG_STAT, val,
return readl_relaxed_poll_timeout(base + RNG_STAT, val,
val & DATA_COUNT, 1000, 30 * 1000);
}
static void histb_trng_init(void __iomem *base, unsigned int depth)
static void histb_rng_init(void __iomem *base, unsigned int depth)
{
u32 val;
val = readl_relaxed(base + HISTB_TRNG_CTRL);
val = readl_relaxed(base + RNG_CTRL);
val &= ~RNG_SOURCE;
val |= 2;
@ -58,72 +54,72 @@ static void histb_trng_init(void __iomem *base, unsigned int depth)
val |= POST_PROCESS_ENABLE;
val |= DROP_ENABLE;
writel_relaxed(val, base + HISTB_TRNG_CTRL);
writel_relaxed(val, base + RNG_CTRL);
}
static int histb_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
static int histb_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
{
struct histb_trng_priv *priv = container_of(rng, typeof(*priv), rng);
struct histb_rng_priv *priv = container_of(rng, typeof(*priv), rng);
void __iomem *base = priv->base;
for (int i = 0; i < max; i += sizeof(u32)) {
if (!(readl_relaxed(base + HISTB_TRNG_STAT) & DATA_COUNT)) {
if (!(readl_relaxed(base + RNG_STAT) & DATA_COUNT)) {
if (!wait)
return i;
if (histb_trng_wait(base)) {
if (histb_rng_wait(base)) {
pr_err("failed to generate random number, generated %d\n",
i);
return i ? i : -ETIMEDOUT;
}
}
*(u32 *) (data + i) = readl_relaxed(base + HISTB_TRNG_NUMBER);
*(u32 *) (data + i) = readl_relaxed(base + RNG_NUMBER);
}
return max;
}
static unsigned int histb_trng_get_depth(void __iomem *base)
static unsigned int histb_rng_get_depth(void __iomem *base)
{
return (readl_relaxed(base + HISTB_TRNG_CTRL) & POST_PROCESS_DEPTH) >> 8;
return (readl_relaxed(base + RNG_CTRL) & POST_PROCESS_DEPTH) >> 8;
}
static ssize_t
depth_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct histb_trng_priv *priv = dev_get_drvdata(dev);
struct histb_rng_priv *priv = dev_get_drvdata(dev);
void __iomem *base = priv->base;
return sprintf(buf, "%d\n", histb_trng_get_depth(base));
return sprintf(buf, "%d\n", histb_rng_get_depth(base));
}
static ssize_t
depth_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct histb_trng_priv *priv = dev_get_drvdata(dev);
struct histb_rng_priv *priv = dev_get_drvdata(dev);
void __iomem *base = priv->base;
unsigned int depth;
if (kstrtouint(buf, 0, &depth))
return -ERANGE;
histb_trng_init(base, depth);
histb_rng_init(base, depth);
return count;
}
static DEVICE_ATTR_RW(depth);
static struct attribute *histb_trng_attrs[] = {
static struct attribute *histb_rng_attrs[] = {
&dev_attr_depth.attr,
NULL,
};
ATTRIBUTE_GROUPS(histb_trng);
ATTRIBUTE_GROUPS(histb_rng);
static int histb_trng_probe(struct platform_device *pdev)
static int histb_rng_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct histb_trng_priv *priv;
struct histb_rng_priv *priv;
void __iomem *base;
int ret;
@ -133,17 +129,17 @@ static int histb_trng_probe(struct platform_device *pdev)
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return -ENOMEM;
return PTR_ERR(base);
histb_trng_init(base, 144);
if (histb_trng_wait(base)) {
histb_rng_init(base, 144);
if (histb_rng_wait(base)) {
dev_err(dev, "cannot bring up device\n");
return -ENODEV;
}
priv->base = base;
priv->rng.name = pdev->name;
priv->rng.read = histb_trng_read;
priv->rng.read = histb_rng_read;
ret = devm_hwrng_register(dev, &priv->rng);
if (ret) {
dev_err(dev, "failed to register hwrng: %d\n", ret);
@ -155,22 +151,23 @@ static int histb_trng_probe(struct platform_device *pdev)
return 0;
}
static const struct of_device_id histb_trng_of_match[] = {
{ .compatible = "hisilicon,histb-trng", },
static const struct of_device_id histb_rng_of_match[] = {
{ .compatible = "hisilicon,histb-rng", },
{ }
};
MODULE_DEVICE_TABLE(of, histb_rng_of_match);
static struct platform_driver histb_trng_driver = {
.probe = histb_trng_probe,
static struct platform_driver histb_rng_driver = {
.probe = histb_rng_probe,
.driver = {
.name = "histb-trng",
.of_match_table = histb_trng_of_match,
.dev_groups = histb_trng_groups,
.name = "histb-rng",
.of_match_table = histb_rng_of_match,
.dev_groups = histb_rng_groups,
},
};
module_platform_driver(histb_trng_driver);
module_platform_driver(histb_rng_driver);
MODULE_DESCRIPTION("HiSTB True RNG");
MODULE_DESCRIPTION("Hisilicon STB random number generator driver");
MODULE_LICENSE("Dual MIT/GPL");
MODULE_AUTHOR("David Yang <mmyangfl@gmail.com>");

7
drivers/crypto/hisilicon/Kconfig
View File

@ -82,10 +82,3 @@ config CRYPTO_DEV_HISI_TRNG
select CRYPTO_RNG
help
Support for HiSilicon TRNG Driver.
config CRYPTO_DEV_HISTB_TRNG
tristate "Support for HiSTB TRNG Driver"
depends on ARCH_HISI || COMPILE_TEST
select HW_RANDOM
help
Support for HiSTB TRNG Driver.

2
drivers/crypto/hisilicon/Makefile
View File

@ -5,4 +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 debugfs.o
obj-$(CONFIG_CRYPTO_DEV_HISI_ZIP) += zip/
obj-y += trng/
obj-$(CONFIG_CRYPTO_DEV_HISI_TRNG) += trng/

3
drivers/crypto/hisilicon/trng/Makefile
View File

@ -1,5 +1,2 @@
obj-$(CONFIG_CRYPTO_DEV_HISI_TRNG) += hisi-trng-v2.o
hisi-trng-v2-objs = trng.o
obj-$(CONFIG_CRYPTO_DEV_HISTB_TRNG) += histb-trng.o
histb-trng-objs += trng-stb.o