From patchwork Fri Jun 10 08:21:53 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Neil Armstrong X-Patchwork-Id: 9169037 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E965B6048F for ; Fri, 10 Jun 2016 08:24:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D74372012F for ; Fri, 10 Jun 2016 08:24:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CBD9828319; Fri, 10 Jun 2016 08:24:15 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 3CD6B2012F for ; Fri, 10 Jun 2016 08:24:15 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1bBHiQ-0005JG-1f; Fri, 10 Jun 2016 08:22:54 +0000 Received: from mail-wm0-x22c.google.com ([2a00:1450:400c:c09::22c]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1bBHhx-00056c-4l for linux-arm-kernel@lists.infradead.org; Fri, 10 Jun 2016 08:22:27 +0000 Received: by mail-wm0-x22c.google.com with SMTP id v199so138336939wmv.0 for ; Fri, 10 Jun 2016 01:22:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=vUKTQWdj4ZYjVBVIBdBl8+SgkNzR5p8g+c0eJ2JSDqk=; b=S03pS5l0xKxsPJmoNgpG4HiMq5rn4qEMDP7DBqM82FBlE/2MUaK7vc+NuLf72Mu9AV 5Hablnm6m405Ip0sKOr3FnrBEuLSXd7er4LWCUZl7zC9I0CFH4UjkktcXbtY+IDXkE2Z jMj1kqsi4zk8x+CAHWItmDQbwzVgvcQMMmRzcvYJB+5ClfjhyBvVEVHPHMI6NkcpbJs2 1QQ2Levv8yeAnD6U84k2Bjy1yDdY4heNb+VxVZdUfKXbUMvWxLQ81H8dnABk+D4pBGQM TW8DjuMXWzxZ/queUYU0JD6hGri8HrhwegLmnw4AcPt8Aje+eq8N04VBZjEw7Wf/MxVr kO1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=vUKTQWdj4ZYjVBVIBdBl8+SgkNzR5p8g+c0eJ2JSDqk=; b=d+YhrtqhW5PLr3B3tuOJiiXUCvjz2uyPnNeTT3CMfVQVSdI8aLOKDCzVwSnay03F0A SIuFKvuDqZZj/aWci7/auidyy8lwmhYy04rD2gn5671gZ8iNe4FJTleHMt5LV4HCg5oF J5SVpH9tCzWGFJchF9NoVLmgW/qFxBXQfNh3xnuBNHTOmjSglfXunZNapNYCz7tHeVVA yLIpiGsF+xnD/uuqUUoRMCkU7FIbOVU3XgRKc5HNy7ofEXrFko+J8qEJ51ZOvfiLzr7r guOVz70Gck0j6RDE9KQOBw77aul5cBPW7KNKO175UjrlOa+gQZFVZl20/rHGr1x1J2ff PNOA== X-Gm-Message-State: ALyK8tLgz1Q6dsLjORhlFCPTeyVoY2W6sEXOlO7PMynG5+RIp+hUCzTZI8CvWEcmtxKsARsL X-Received: by 10.194.186.179 with SMTP id fl19mr1024240wjc.2.1465546923479; Fri, 10 Jun 2016 01:22:03 -0700 (PDT) Received: from localhost.localdomain ([90.63.244.31]) by smtp.gmail.com with ESMTPSA id t199sm11680221wmt.11.2016.06.10.01.22.02 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 10 Jun 2016 01:22:02 -0700 (PDT) From: Neil Armstrong To: Matt Mackall , Herbert Xu Subject: [PATCH v2 1/3] char: hw_random: Add Amlogic Meson Hardware Random Generator Date: Fri, 10 Jun 2016 10:21:53 +0200 Message-Id: <1465546915-24229-2-git-send-email-narmstrong@baylibre.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1465546915-24229-1-git-send-email-narmstrong@baylibre.com> References: <1465546915-24229-1-git-send-email-narmstrong@baylibre.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160610_012225_364260_D78FDE16 X-CRM114-Status: GOOD ( 20.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-crypto@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Neil Armstrong MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add support for the Amlogic Meson SoCs hardware random generator. Signed-off-by: Neil Armstrong --- drivers/char/hw_random/Kconfig | 14 ++++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/meson-rng.c | 131 +++++++++++++++++++++++++++++++++++++ 3 files changed, 146 insertions(+) create mode 100644 drivers/char/hw_random/meson-rng.c diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index ac51149..8558a61 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -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 63022b4..04bb0b0 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/meson-rng.c b/drivers/char/hw_random/meson-rng.c new file mode 100644 index 0000000..0cfd81b --- /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 + * 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 . + * 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 + * 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 +#include +#include +#include +#include +#include +#include +#include + +#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 "); +MODULE_AUTHOR("Neil Armstrong "); +MODULE_LICENSE("Dual BSD/GPL");