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@xxxxxxxxx Signed-off-by: David Yang <mmyangfl@xxxxxxxxx> --- v2: drop the dependency on HW_RANDOM drivers/char/hw_random/Kconfig | 11 +++ drivers/char/hw_random/Makefile | 1 + .../trng-stb.c => char/hw_random/histb-rng.c} | 83 +++++++++---------- drivers/crypto/hisilicon/Kconfig | 7 -- drivers/crypto/hisilicon/Makefile | 2 +- drivers/crypto/hisilicon/trng/Makefile | 3 - 6 files changed, 53 insertions(+), 54 deletions(-) rename drivers/{crypto/hisilicon/trng/trng-stb.c => char/hw_random/histb-rng.c} (53%) diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 4fdf07ae3c54..c92f146ee89a 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -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 diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 09bde4a0f971..32549a1186dc 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -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 diff --git a/drivers/crypto/hisilicon/trng/trng-stb.c b/drivers/char/hw_random/histb-rng.c similarity index 53% rename from drivers/crypto/hisilicon/trng/trng-stb.c rename to drivers/char/hw_random/histb-rng.c index 29200a7d3d81..f652e1135e4b 100644 --- a/drivers/crypto/hisilicon/trng/trng-stb.c +++ b/drivers/char/hw_random/histb-rng.c @@ -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@xxxxxxxxx>"); diff --git a/drivers/crypto/hisilicon/Kconfig b/drivers/crypto/hisilicon/Kconfig index e8690c223584..4137a8bf131f 100644 --- a/drivers/crypto/hisilicon/Kconfig +++ b/drivers/crypto/hisilicon/Kconfig @@ -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. diff --git a/drivers/crypto/hisilicon/Makefile b/drivers/crypto/hisilicon/Makefile index fc51e0edec69..8595a5a5d228 100644 --- a/drivers/crypto/hisilicon/Makefile +++ b/drivers/crypto/hisilicon/Makefile @@ -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/ diff --git a/drivers/crypto/hisilicon/trng/Makefile b/drivers/crypto/hisilicon/trng/Makefile index cf20b057c66b..d909079f351c 100644 --- a/drivers/crypto/hisilicon/trng/Makefile +++ b/drivers/crypto/hisilicon/trng/Makefile @@ -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 -- 2.39.2
