hwrng: meson - Add Amlogic Meson Hardware Random Generator (e123be16) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/char/hw_random/Kconfig

+14 −0

Original line number	Original line	Diff line number	Diff line
	@@ -396,6 +396,20 @@ config HW_RANDOM_PIC32

	If unsure, say Y.		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		endif # HW_RANDOM

	config UML_RANDOM		config UML_RANDOM

drivers/char/hw_random/Makefile

+1 −0

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	@@ -34,3 +34,4 @@ obj-$(CONFIG_HW_RANDOM_ST) += st-rng.o
	obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o		obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o
	obj-$(CONFIG_HW_RANDOM_STM32) += stm32-rng.o		obj-$(CONFIG_HW_RANDOM_STM32) += stm32-rng.o
	obj-$(CONFIG_HW_RANDOM_PIC32) += pic32-rng.o		obj-$(CONFIG_HW_RANDOM_PIC32) += pic32-rng.o
			obj-$(CONFIG_HW_RANDOM_MESON) += meson-rng.o

drivers/char/hw_random/meson-rng.c

0 → 100644

+131 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* 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");