From patchwork Wed Feb 15 13:27:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 13141659 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 817A4C6379F for ; Wed, 15 Feb 2023 13:30:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Subject:To:From :Date:Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=MY/2fRwk0orA21heb+WlP4PCVcqpwxkEAfTztuRL7yc=; b=b4Mu4vJAmXXDgj NZMSCmbOCWuHPuLI4RYJwQYWW1IS+kFqabzXz/wTvit9O9Cr9DzinAZkWKtuyB+eUXK8SRegDe7j6 kk1pXx8I7NgnOsnJvxDebrHfZvLKRS82h4mH8+aT43R6fwmPwGFNUA2rAQsKa8jsZRy1lOB2GTayX xGCYsDsF7DP1I/1umDX9xpwCn29uj0ocKXZCcTD/+gWG5TOlkBxPrURbpCkvnCN/vIRQBlLGcXA+r yEBFBPFShRTOexCjadV143j/TV4ppAauDxnt0ZnBCE9YrV8xb6N/cDm1KYj1O8Wv1HaQ/b/VgB0Mi qg9el2QE9VarI/Mr+AQQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pSHqk-005zvd-1S; Wed, 15 Feb 2023 13:29:30 +0000 Received: from fudo.makrotopia.org ([2a07:2ec0:3002::71]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pSHqf-005ztt-PD; Wed, 15 Feb 2023 13:29:27 +0000 Received: from local by fudo.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.96) (envelope-from ) id 1pSHq4-0005qU-1f; Wed, 15 Feb 2023 14:28:48 +0100 Date: Wed, 15 Feb 2023 13:27:11 +0000 From: Daniel Golle To: Sean Wang , Olivia Mackall , Herbert Xu , Matthias Brugger , AngeloGioacchino Del Regno , Conor Dooley , Mingming Su , linux-crypto@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] hwrng: add driver for MediaTek TRNG SMC Message-ID: <89865515728cb937b6591160ad9c30b4bcc8dd41.1676467500.git.daniel@makrotopia.org> MIME-Version: 1.0 Content-Disposition: inline X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230215_052925_836967_C41C7130 X-CRM114-Status: GOOD ( 21.84 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add driver providing kernel-side support for the Random Number Generator hardware found on Mediatek SoCs which have a driver in ARM TrustedFirmware-A allowing Linux to read random numbers using a non-standard vendor-defined Secure Monitor Call. Signed-off-by: Daniel Golle --- MAINTAINERS | 1 + drivers/char/hw_random/Kconfig | 16 +++++++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/mtk-rng-v2.c | 74 +++++++++++++++++++++++++++++ 4 files changed, 92 insertions(+) create mode 100644 drivers/char/hw_random/mtk-rng-v2.c base-commit: 9d9019bcea1aac7eed64a1a4966282b6b7b141c8 diff --git a/MAINTAINERS b/MAINTAINERS index be167c695c64..90d82aba6d73 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -13148,6 +13148,7 @@ F: drivers/leds/leds-mt6323.c MEDIATEK RANDOM NUMBER GENERATOR SUPPORT M: Sean Wang S: Maintained +F: drivers/char/hw_random/mtk-rng-v2.c F: drivers/char/hw_random/mtk-rng.c MEDIATEK SMI DRIVER diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 4fdf07ae3c54..7c900185486d 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -439,6 +439,22 @@ config HW_RANDOM_MTK If unsure, say Y. +config HW_RANDOM_MTK_V2 + tristate "Mediatek Random Number Generator support (v2/SMC)" + depends on HW_RANDOM + depends on (ARM64 && ARCH_MEDIATEK) || COMPILE_TEST + default y + help + This driver provides kernel-side support for the Random Number + Generator hardware found on Mediatek SoCs which have a driver + in ARM TrustedFirmware-A allowing Linux to read using a non- + standard vendor-defined Secure Monitor Call. + + To compile this driver as a module, choose M here. the + module will be called mtk-rng-v2. + + 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 09bde4a0f971..ba319c509e86 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -38,6 +38,7 @@ 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-$(CONFIG_HW_RANDOM_MTK_V2) += mtk-rng-v2.o obj-$(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-rng-v2.c b/drivers/char/hw_random/mtk-rng-v2.c new file mode 100644 index 000000000000..6e61f4361d9e --- /dev/null +++ b/drivers/char/hw_random/mtk-rng-v2.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for Mediatek Hardware Random Number Generator (v2/SMCC) + * + * Copyright (C) 2023 Daniel Golle + * based on patch from Mingming Su + */ +#define MTK_RNG_DEV KBUILD_MODNAME + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MTK_SIP_KERNEL_GET_RND MTK_SIP_SMC_CMD(0x550) + +static int mtk_rng_v2_read(struct hwrng *rng, void *buf, size_t max, bool wait) +{ + struct arm_smccc_res res; + int retval = 0; + + while (max >= sizeof(u32)) { + arm_smccc_smc(MTK_SIP_KERNEL_GET_RND, 0, 0, 0, 0, 0, 0, 0, + &res); + if (res.a0) + break; + + *(u32 *)buf = res.a1; + retval += sizeof(u32); + buf += sizeof(u32); + max -= sizeof(u32); + } + + return retval || !wait ? retval : -EIO; +} + +static int mtk_rng_v2_probe(struct platform_device *pdev) +{ + struct hwrng *trng; + + trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL); + if (!trng) + return -ENOMEM; + + trng->name = pdev->name; + trng->read = mtk_rng_v2_read; + trng->quality = 900; + + return devm_hwrng_register(&pdev->dev, trng); +} + +static const struct of_device_id mtk_rng_v2_match[] = { + { .compatible = "mediatek,mt7981-rng" }, + {}, +}; +MODULE_DEVICE_TABLE(of, mtk_rng_v2_match); + +static struct platform_driver mtk_rng_v2_driver = { + .probe = mtk_rng_v2_probe, + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = mtk_rng_v2_match, + }, +}; +module_platform_driver(mtk_rng_v2_driver); + +MODULE_DESCRIPTION("Mediatek Random Number Generator Driver (v2/SMC)"); +MODULE_AUTHOR("Daniel Golle "); +MODULE_LICENSE("GPL");