diff options
Diffstat (limited to 'drivers/char/hw_random')
| -rw-r--r-- | drivers/char/hw_random/Kconfig | 16 | ||||
| -rw-r--r-- | drivers/char/hw_random/Makefile | 1 | ||||
| -rw-r--r-- | drivers/char/hw_random/bcm2835-rng.c | 47 | ||||
| -rw-r--r-- | drivers/char/hw_random/exynos-rng.c | 4 | ||||
| -rw-r--r-- | drivers/char/hw_random/meson-rng.c | 131 | ||||
| -rw-r--r-- | drivers/char/hw_random/omap-rng.c | 16 | ||||
| -rw-r--r-- | drivers/char/hw_random/stm32-rng.c | 10 |
7 files changed, 209 insertions, 16 deletions
diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index ac51149e9777..56ad5a5936a9 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -90,7 +90,7 @@ config HW_RANDOM_BCM63XX config HW_RANDOM_BCM2835 tristate "Broadcom BCM2835 Random Number Generator support" - depends on ARCH_BCM2835 + depends on ARCH_BCM2835 || ARCH_BCM_NSP || ARCH_BCM_5301X default HW_RANDOM ---help--- This driver provides kernel-side support for the Random Number @@ -396,6 +396,20 @@ config HW_RANDOM_PIC32 If unsure, say Y. +config HW_RANDOM_MESON + tristate "Amlogic Meson Random Number Generator support" + depends on HW_RANDOM + depends on ARCH_MESON || COMPILE_TEST + default y + ---help--- + This driver provides kernel-side support for the Random Number + Generator hardware found on Amlogic Meson SoCs. + + To compile this driver as a module, choose M here. the + module will be called meson-rng. + + If unsure, say Y. + endif # HW_RANDOM config UML_RANDOM diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 63022b49f160..04bb0b03356f 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -34,3 +34,4 @@ obj-$(CONFIG_HW_RANDOM_ST) += st-rng.o obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o obj-$(CONFIG_HW_RANDOM_STM32) += stm32-rng.o obj-$(CONFIG_HW_RANDOM_PIC32) += pic32-rng.o +obj-$(CONFIG_HW_RANDOM_MESON) += meson-rng.o diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c index 7192ec25f667..af2149273fe0 100644 --- a/drivers/char/hw_random/bcm2835-rng.c +++ b/drivers/char/hw_random/bcm2835-rng.c @@ -19,6 +19,7 @@ #define RNG_CTRL 0x0 #define RNG_STATUS 0x4 #define RNG_DATA 0x8 +#define RNG_INT_MASK 0x10 /* enable rng */ #define RNG_RBGEN 0x1 @@ -26,10 +27,24 @@ /* the initial numbers generated are "less random" so will be discarded */ #define RNG_WARMUP_COUNT 0x40000 +#define RNG_INT_OFF 0x1 + +static void __init nsp_rng_init(void __iomem *base) +{ + u32 val; + + /* mask the interrupt */ + val = readl(base + RNG_INT_MASK); + val |= RNG_INT_OFF; + writel(val, base + RNG_INT_MASK); +} + static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) { void __iomem *rng_base = (void __iomem *)rng->priv; + u32 max_words = max / sizeof(u32); + u32 num_words, count; while ((__raw_readl(rng_base + RNG_STATUS) >> 24) == 0) { if (!wait) @@ -37,8 +52,14 @@ static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max, cpu_relax(); } - *(u32 *)buf = __raw_readl(rng_base + RNG_DATA); - return sizeof(u32); + num_words = readl(rng_base + RNG_STATUS) >> 24; + if (num_words > max_words) + num_words = max_words; + + for (count = 0; count < num_words; count++) + ((u32 *)buf)[count] = readl(rng_base + RNG_DATA); + + return num_words * sizeof(u32); } static struct hwrng bcm2835_rng_ops = { @@ -46,10 +67,19 @@ static struct hwrng bcm2835_rng_ops = { .read = bcm2835_rng_read, }; +static const struct of_device_id bcm2835_rng_of_match[] = { + { .compatible = "brcm,bcm2835-rng"}, + { .compatible = "brcm,bcm-nsp-rng", .data = nsp_rng_init}, + { .compatible = "brcm,bcm5301x-rng", .data = nsp_rng_init}, + {}, +}; + static int bcm2835_rng_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; + void (*rng_setup)(void __iomem *base); + const struct of_device_id *rng_id; void __iomem *rng_base; int err; @@ -61,6 +91,15 @@ static int bcm2835_rng_probe(struct platform_device *pdev) } bcm2835_rng_ops.priv = (unsigned long)rng_base; + rng_id = of_match_node(bcm2835_rng_of_match, np); + if (!rng_id) + return -EINVAL; + + /* Check for rng init function, execute it */ + rng_setup = rng_id->data; + if (rng_setup) + rng_setup(rng_base); + /* set warm-up count & enable */ __raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS); __raw_writel(RNG_RBGEN, rng_base + RNG_CTRL); @@ -90,10 +129,6 @@ static int bcm2835_rng_remove(struct platform_device *pdev) return 0; } -static const struct of_device_id bcm2835_rng_of_match[] = { - { .compatible = "brcm,bcm2835-rng", }, - {}, -}; MODULE_DEVICE_TABLE(of, bcm2835_rng_of_match); static struct platform_driver bcm2835_rng_driver = { diff --git a/drivers/char/hw_random/exynos-rng.c b/drivers/char/hw_random/exynos-rng.c index ed44561ea647..23d358553b21 100644 --- a/drivers/char/hw_random/exynos-rng.c +++ b/drivers/char/hw_random/exynos-rng.c @@ -45,12 +45,12 @@ struct exynos_rng { static u32 exynos_rng_readl(struct exynos_rng *rng, u32 offset) { - return __raw_readl(rng->mem + offset); + return readl_relaxed(rng->mem + offset); } static void exynos_rng_writel(struct exynos_rng *rng, u32 val, u32 offset) { - __raw_writel(val, rng->mem + offset); + writel_relaxed(val, rng->mem + offset); } static int exynos_rng_configure(struct exynos_rng *exynos_rng) diff --git a/drivers/char/hw_random/meson-rng.c b/drivers/char/hw_random/meson-rng.c new file mode 100644 index 000000000000..0cfd81bcaeac --- /dev/null +++ b/drivers/char/hw_random/meson-rng.c @@ -0,0 +1,131 @@ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright (c) 2016 BayLibre, SAS. + * Author: Neil Armstrong <narmstrong@baylibre.com> + * Copyright (C) 2014 Amlogic, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + * The full GNU General Public License is included in this distribution + * in the file called COPYING. + * + * BSD LICENSE + * + * Copyright (c) 2016 BayLibre, SAS. + * Author: Neil Armstrong <narmstrong@baylibre.com> + * Copyright (C) 2014 Amlogic, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +#include <linux/err.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/platform_device.h> +#include <linux/hw_random.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/of.h> + +#define RNG_DATA 0x00 + +struct meson_rng_data { + void __iomem *base; + struct platform_device *pdev; + struct hwrng rng; +}; + +static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) +{ + struct meson_rng_data *data = + container_of(rng, struct meson_rng_data, rng); + + if (max < sizeof(u32)) + return 0; + + *(u32 *)buf = readl_relaxed(data->base + RNG_DATA); + + return sizeof(u32); +} + +static int meson_rng_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct meson_rng_data *data; + struct resource *res; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->pdev = pdev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->base = devm_ioremap_resource(dev, res); + if (IS_ERR(data->base)) + return PTR_ERR(data->base); + + data->rng.name = pdev->name; + data->rng.read = meson_rng_read; + + platform_set_drvdata(pdev, data); + + return devm_hwrng_register(dev, &data->rng); +} + +static const struct of_device_id meson_rng_of_match[] = { + { .compatible = "amlogic,meson-rng", }, + {}, +}; + +static struct platform_driver meson_rng_driver = { + .probe = meson_rng_probe, + .driver = { + .name = "meson-rng", + .of_match_table = meson_rng_of_match, + }, +}; + +module_platform_driver(meson_rng_driver); + +MODULE_ALIAS("platform:meson-rng"); +MODULE_DESCRIPTION("Meson H/W Random Number Generator driver"); +MODULE_AUTHOR("Lawrence Mok <lawrence.mok@amlogic.com>"); +MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); +MODULE_LICENSE("Dual BSD/GPL"); diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c index 8a1432e8bb80..01d4be2c354b 100644 --- a/drivers/char/hw_random/omap-rng.c +++ b/drivers/char/hw_random/omap-rng.c @@ -384,7 +384,12 @@ static int omap_rng_probe(struct platform_device *pdev) } pm_runtime_enable(&pdev->dev); - pm_runtime_get_sync(&pdev->dev); + ret = pm_runtime_get_sync(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, "Failed to runtime_get device: %d\n", ret); + pm_runtime_put_noidle(&pdev->dev); + goto err_ioremap; + } ret = (dev->of_node) ? of_get_omap_rng_device_details(priv, pdev) : get_omap_rng_device_details(priv); @@ -435,8 +440,15 @@ static int __maybe_unused omap_rng_suspend(struct device *dev) static int __maybe_unused omap_rng_resume(struct device *dev) { struct omap_rng_dev *priv = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret) { + dev_err(dev, "Failed to runtime_get device: %d\n", ret); + pm_runtime_put_noidle(dev); + return ret; + } - pm_runtime_get_sync(dev); priv->pdata->init(priv); return 0; diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c index 92a810648bd0..63d84e6f1891 100644 --- a/drivers/char/hw_random/stm32-rng.c +++ b/drivers/char/hw_random/stm32-rng.c @@ -69,8 +69,12 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) } /* If error detected or data not ready... */ - if (sr != RNG_SR_DRDY) + if (sr != RNG_SR_DRDY) { + if (WARN_ONCE(sr & (RNG_SR_SEIS | RNG_SR_CEIS), + "bad RNG status - %x\n", sr)) + writel_relaxed(0, priv->base + RNG_SR); break; + } *(u32 *)data = readl_relaxed(priv->base + RNG_DR); @@ -79,10 +83,6 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) max -= sizeof(u32); } - if (WARN_ONCE(sr & (RNG_SR_SEIS | RNG_SR_CEIS), - "bad RNG status - %x\n", sr)) - writel_relaxed(0, priv->base + RNG_SR); - pm_runtime_mark_last_busy((struct device *) priv->rng.priv); pm_runtime_put_sync_autosuspend((struct device *) priv->rng.priv); |