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
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
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Copyright (c) 2023 David Yang
+ */
+
+#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/platform_device.h>
+
+#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 RNG_NUMBER 0x4
+#define RNG_STAT 0x8
+#define DATA_COUNT GENMASK(2, 0) /* max 4 */
+
+struct histb_rng_priv {
+ struct hwrng rng;
+ void __iomem *base;
+};
+
+/*
+ * Observed:
+ * depth = 1 -> ~1ms
+ * depth = 255 -> ~16ms
+ */
+static int histb_rng_wait(void __iomem *base)
+{
+ u32 val;
+
+ return readl_relaxed_poll_timeout(base + RNG_STAT, val,
+ val & DATA_COUNT, 1000, 30 * 1000);
+}
+
+static void histb_rng_init(void __iomem *base, unsigned int depth)
+{
+ u32 val;
+
+ val = readl_relaxed(base + RNG_CTRL);
+
+ val &= ~RNG_SOURCE;
+ val |= 2;
+
+ val &= ~POST_PROCESS_DEPTH;
+ val |= min(depth, 0xffu) << 8;
+
+ val |= POST_PROCESS_ENABLE;
+ val |= DROP_ENABLE;
+
+ writel_relaxed(val, base + RNG_CTRL);
+}
+
+static int histb_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+ 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 + RNG_STAT) & DATA_COUNT)) {
+ if (!wait)
+ return i;
+ 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 + RNG_NUMBER);
+ }
+
+ return max;
+}
+
+static unsigned int histb_rng_get_depth(void __iomem *base)
+{
+ 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_rng_priv *priv = dev_get_drvdata(dev);
+ void __iomem *base = priv->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_rng_priv *priv = dev_get_drvdata(dev);
+ void __iomem *base = priv->base;
+ unsigned int depth;
+
+ if (kstrtouint(buf, 0, &depth))
+ return -ERANGE;
+
+ histb_rng_init(base, depth);
+ return count;
+}
+
+static DEVICE_ATTR_RW(depth);
+
+static struct attribute *histb_rng_attrs[] = {
+ &dev_attr_depth.attr,
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(histb_rng);
+
+static int histb_rng_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct histb_rng_priv *priv;
+ void __iomem *base;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return PTR_ERR(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_rng_read;
+ ret = devm_hwrng_register(dev, &priv->rng);
+ if (ret) {
+ dev_err(dev, "failed to register hwrng: %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, priv);
+ dev_set_drvdata(dev, priv);
+ return 0;
+}
+
+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_rng_driver = {
+ .probe = histb_rng_probe,
+ .driver = {
+ .name = "histb-rng",
+ .of_match_table = histb_rng_of_match,
+ .dev_groups = histb_rng_groups,
+ },
+};
+
+module_platform_driver(histb_rng_driver);
+
+MODULE_DESCRIPTION("Hisilicon STB random number generator driver");
+MODULE_LICENSE("Dual MIT/GPL");
+MODULE_AUTHOR("David Yang <mmyangfl@gmail.com>");
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.
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/
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
+++ /dev/null
-// 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/module.h>
-#include <linux/mutex.h>
-#include <linux/of_device.h>
-
-#define HISTB_TRNG_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 DATA_COUNT GENMASK(2, 0) /* max 4 */
-
-struct histb_trng_priv {
- struct hwrng rng;
- void __iomem *base;
-};
-
-/*
- * Observed:
- * depth = 1 -> ~1ms
- * depth = 255 -> ~16ms
- */
-static int histb_trng_wait(void __iomem *base)
-{
- u32 val;
-
- return readl_relaxed_poll_timeout(base + HISTB_TRNG_STAT, val,
- val & DATA_COUNT, 1000, 30 * 1000);
-}
-
-static void histb_trng_init(void __iomem *base, unsigned int depth)
-{
- u32 val;
-
- val = readl_relaxed(base + HISTB_TRNG_CTRL);
-
- val &= ~RNG_SOURCE;
- val |= 2;
-
- val &= ~POST_PROCESS_DEPTH;
- val |= min(depth, 0xffu) << 8;
-
- val |= POST_PROCESS_ENABLE;
- val |= DROP_ENABLE;
-
- writel_relaxed(val, base + HISTB_TRNG_CTRL);
-}
-
-static int histb_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
-{
- struct histb_trng_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 (!wait)
- return i;
- if (histb_trng_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);
- }
-
- return max;
-}
-
-static unsigned int histb_trng_get_depth(void __iomem *base)
-{
- return (readl_relaxed(base + HISTB_TRNG_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);
- void __iomem *base = priv->base;
-
- return sprintf(buf, "%d\n", histb_trng_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);
- void __iomem *base = priv->base;
- unsigned int depth;
-
- if (kstrtouint(buf, 0, &depth))
- return -ERANGE;
-
- histb_trng_init(base, depth);
- return count;
-}
-
-static DEVICE_ATTR_RW(depth);
-
-static struct attribute *histb_trng_attrs[] = {
- &dev_attr_depth.attr,
- NULL,
-};
-
-ATTRIBUTE_GROUPS(histb_trng);
-
-static int histb_trng_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct histb_trng_priv *priv;
- void __iomem *base;
- int ret;
-
- priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
-
- base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(base))
- return -ENOMEM;
-
- histb_trng_init(base, 144);
- if (histb_trng_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;
- ret = devm_hwrng_register(dev, &priv->rng);
- if (ret) {
- dev_err(dev, "failed to register hwrng: %d\n", ret);
- return ret;
- }
-
- platform_set_drvdata(pdev, priv);
- dev_set_drvdata(dev, priv);
- return 0;
-}
-
-static const struct of_device_id histb_trng_of_match[] = {
- { .compatible = "hisilicon,histb-trng", },
- { }
-};
-
-static struct platform_driver histb_trng_driver = {
- .probe = histb_trng_probe,
- .driver = {
- .name = "histb-trng",
- .of_match_table = histb_trng_of_match,
- .dev_groups = histb_trng_groups,
- },
-};
-
-module_platform_driver(histb_trng_driver);
-
-MODULE_DESCRIPTION("HiSTB True RNG");
-MODULE_LICENSE("Dual MIT/GPL");
-MODULE_AUTHOR("David Yang <mmyangfl@gmail.com>");
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