From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,UNPARSEABLE_RELAY,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8ED56C07542 for ; Mon, 27 May 2019 08:40:22 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5E86F20815 for ; Mon, 27 May 2019 08:40:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="eMfvv3l+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5E86F20815 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=bm+dj2QTGqMlwpvUIBwvddcLJXA0MVwXCCoEbBK7+B0=; b=eMfvv3l+n4lX8/ DXuY6Yt9IXTDV1CkrpjxHzAHRSTja47Q9P0n0m58eAzrguPdH7dGZQdzDUZ6yP5jSHOL6REmFymVe NGWd/UYQCbRrp2ojL4SMSKtOaOX1eVM+hX0jkZw201sYJm48F0zSk3lo3cU1rCSdURQwRCDZvszS1 BkTcJOeu/+eEf3QthYISubhcR9Uk9ugkHGAekYhToUA9Kuw8oMKsozkPZzBaqPS0xyA28p1cNuDcz xMv8AtueSoJM5K5DIvgc+RVF9AwMgpRWPUF0Obp0WaIX568izwkNg58py/tLsHMZzgMhqvGIVo8vr 2dkHZ7q5HVMI7IYIlWWw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hVBB2-0003Ek-Ua; Mon, 27 May 2019 08:40:16 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hVBAK-0001My-GW; Mon, 27 May 2019 08:39:42 +0000 X-UUID: 2c2e308801064927a56cb89cd4d566a9-20190527 X-UUID: 2c2e308801064927a56cb89cd4d566a9-20190527 Received: from mtkcas68.mediatek.inc [(172.29.94.19)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLS) with ESMTP id 413745007; Mon, 27 May 2019 00:39:23 -0800 Received: from MTKMBS01N2.mediatek.inc (172.21.101.79) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Mon, 27 May 2019 01:39:23 -0700 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs01n2.mediatek.inc (172.21.101.79) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Mon, 27 May 2019 16:39:08 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Mon, 27 May 2019 16:39:08 +0800 From: Neal Liu To: Matt Mackall , Herbert Xu , Rob Herring , Mark Rutland , Matthias Brugger , Sean Wang Subject: [PATCH v2 3/3] hwrng: add mtk-sec-rng driver Date: Mon, 27 May 2019 16:38:46 +0800 Message-ID: <1558946326-13630-4-git-send-email-neal.liu@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1558946326-13630-1-git-send-email-neal.liu@mediatek.com> References: <1558946326-13630-1-git-send-email-neal.liu@mediatek.com> MIME-Version: 1.0 X-TM-SNTS-SMTP: BD4B105A6E092554A06C671E9FEB9F64EE7E7C79F5631132485CF7A2508A38002000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190527_013933_324018_56B28684 X-CRM114-Status: GOOD ( 15.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, wsd_upstream@mediatek.com, lkml , Crystal Guo , linux-mediatek@lists.infradead.org, linux-crypto@vger.kernel.org, Neal Liu , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org For MediaTek SoCs on ARMv8 with TrustZone enabled, peripherals like entropy sources is not accessible from normal world (linux) and rather accessible from secure world (ATF/TEE) only. This driver aims to provide a generic interface to ATF rng service. Signed-off-by: Neal Liu --- drivers/char/hw_random/Kconfig | 16 ++++++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/mtk-sec-rng.c | 97 ++++++++++++++++++++++++++++++++++ 3 files changed, 114 insertions(+) create mode 100644 drivers/char/hw_random/mtk-sec-rng.c diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 25a7d8f..6c82a3b 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -398,6 +398,22 @@ config HW_RANDOM_MTK If unsure, say Y. +config HW_RANDOM_MTK_SEC + tristate "MediaTek Security Random Number Generator support" + depends on HW_RANDOM + depends on ARCH_MEDIATEK || COMPILE_TEST + default HW_RANDOM + help + This driver provides kernel-side support for the Random Number + Generator hardware found on MediaTek SoCs. The difference with + mtk-rng is the Random Number Generator hardware is secure + access only. + + To compile this driver as a module, choose M here. the + module will be called mtk-sec-rng. + + If unsure, say Y. + config HW_RANDOM_S390 tristate "S390 True Random Number Generator support" depends on S390 diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 7c9ef4a..0ae4993 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_HW_RANDOM_PIC32) += pic32-rng.o obj-$(CONFIG_HW_RANDOM_MESON) += meson-rng.o obj-$(CONFIG_HW_RANDOM_CAVIUM) += cavium-rng.o cavium-rng-vf.o obj-$(CONFIG_HW_RANDOM_MTK) += mtk-rng.o +obj-$(CONFIG_HW_RANDOM_MTK_SEC) += mtk-sec-rng.o obj-$(CONFIG_HW_RANDOM_S390) += s390-trng.o obj-$(CONFIG_HW_RANDOM_KEYSTONE) += ks-sa-rng.o obj-$(CONFIG_HW_RANDOM_OPTEE) += optee-rng.o diff --git a/drivers/char/hw_random/mtk-sec-rng.c b/drivers/char/hw_random/mtk-sec-rng.c new file mode 100644 index 0000000..4c6e5bf --- /dev/null +++ b/drivers/char/hw_random/mtk-sec-rng.c @@ -0,0 +1,97 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 MediaTek Inc. + */ + +#include +#include +#include +#include +#include +#include + +#define MT67XX_RNG_MAGIC 0x74726e67 +#define SMC_RET_NUM 4 +#define MTK_SEC_RND_SIZE (sizeof(u32) * SMC_RET_NUM) + +struct mtk_sec_rng_priv { + struct hwrng rng; +}; + +static void mtk_sec_get_rnd(uint32_t *val) +{ + struct arm_smccc_res res; + + arm_smccc_smc(MTK_SIP_KERNEL_GET_RND, + MT67XX_RNG_MAGIC, 0, 0, 0, 0, 0, 0, &res); + + val[0] = res.a0; + val[1] = res.a1; + val[2] = res.a2; + val[3] = res.a3; +} + +static int mtk_sec_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) +{ + size_t get_rnd_size = MTK_SEC_RND_SIZE; + u32 val[4] = {0}; + int i, retval = 0; + + while (max >= get_rnd_size) { + mtk_sec_get_rnd(val); + + for (i = 0; i < SMC_RET_NUM; i++) { + *(u32 *)buf = val[i]; + buf += sizeof(u32); + } + + retval += get_rnd_size; + max -= get_rnd_size; + } + + return retval; +} + +static int mtk_sec_rng_probe(struct platform_device *pdev) +{ + struct mtk_sec_rng_priv *priv; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->rng.name = pdev->name; + priv->rng.read = mtk_sec_rng_read; + priv->rng.priv = (unsigned long)&pdev->dev; + priv->rng.quality = 900; + + ret = devm_hwrng_register(&pdev->dev, &priv->rng); + if (ret) { + dev_err(&pdev->dev, "failed to register rng device: %d\n", ret); + return ret; + } + + return 0; +} + +static const struct of_device_id mtk_sec_rng_match[] = { + { .compatible = "mediatek,mtk-sec-rng", }, + {} +}; +MODULE_DEVICE_TABLE(of, mtk_sec_rng_match); + +static struct platform_driver mtk_sec_rng_driver = { + .probe = mtk_sec_rng_probe, + .driver = { + .name = KBUILD_MODNAME, + .owner = THIS_MODULE, + .of_match_table = mtk_sec_rng_match, + }, +}; + +module_platform_driver(mtk_sec_rng_driver); + +MODULE_DESCRIPTION("MediaTek Security Random Number Generator Driver"); +MODULE_AUTHOR("Neal Liu "); +MODULE_LICENSE("GPL"); -- 1.7.9.5 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel