From patchwork Mon Sep 11 12:02:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gatien CHEVALLIER X-Patchwork-Id: 721561 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF06ACA0ECE for ; Mon, 11 Sep 2023 21:56:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236332AbjIKVvP (ORCPT ); Mon, 11 Sep 2023 17:51:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33278 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237141AbjIKMEx (ORCPT ); Mon, 11 Sep 2023 08:04:53 -0400 Received: from mx07-00178001.pphosted.com (mx07-00178001.pphosted.com [185.132.182.106]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E97EECDD; Mon, 11 Sep 2023 05:04:48 -0700 (PDT) Received: from pps.filterd (m0288072.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.22/8.17.1.22) with ESMTP id 38B9Sw8U029064; Mon, 11 Sep 2023 14:04:35 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding:content-type; s= selector1; bh=Qy502fS11BZGcGDP1IGPY0i0y+SNnsTHJY1/5zxvtm0=; b=2y Lw0QWAUlUyYsG7CJg7AgjewY0S63AgTuDoPvJ4t0mXTqzK+oTOhNe3YxNT3tp5tp jnkTQjx6vh5GkNhMu5ZAdDpitwCF8xkhwRaM19YiTEFnz//Yq+eNqpiXSgO6Clvt VvMlRHLDIrp5WyRp5Hb0K4ylFVLdy2HFhhmZFsmnSLVnqSLeWbuZ/nU+5IbGrJrB 5aYwk01OdNk02dbeEys6hKj+SqqyY8TcxJg1pB73KS5s3QF4svWQuW1zouE4SFDL 9DaVRGQEZ0LTeVRSozQwqnZwtOhugmGljkRacX7nj2Ryntee/De67b6IwkvZnw3D jFJbc7uZFV+gPAr7SJMQ== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3t0e4fr6mm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 11 Sep 2023 14:04:35 +0200 (MEST) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 7DD2310005A; Mon, 11 Sep 2023 14:04:34 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 716DA252259; Mon, 11 Sep 2023 14:04:34 +0200 (CEST) Received: from localhost (10.201.20.32) by SHFDAG1NODE1.st.com (10.75.129.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Mon, 11 Sep 2023 14:04:34 +0200 From: Gatien Chevallier To: Olivia Mackall , Herbert Xu , Rob Herring , Krzysztof Kozlowski , Maxime Coquelin , Alexandre Torgue CC: Lionel Debieve , , , , , , Gatien Chevallier Subject: [PATCH v2 08/10] hwrng: stm32 - support RNG configuration locking mechanism Date: Mon, 11 Sep 2023 14:02:01 +0200 Message-ID: <20230911120203.774632-9-gatien.chevallier@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230911120203.774632-1-gatien.chevallier@foss.st.com> References: <20230911120203.774632-1-gatien.chevallier@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.201.20.32] X-ClientProxiedBy: SHFCAS1NODE1.st.com (10.75.129.72) To SHFDAG1NODE1.st.com (10.75.129.69) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-11_06,2023-09-05_01,2023-05-22_02 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org If "st,rng-lock-conf" DT binding property is set for a stm32-rng node, the RNG configuration will be locked until next hardware block reset or platform reset. Signed-off-by: Gatien Chevallier --- drivers/char/hw_random/stm32-rng.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c index 819f062f454d..4a602d666dad 100644 --- a/drivers/char/hw_random/stm32-rng.c +++ b/drivers/char/hw_random/stm32-rng.c @@ -62,6 +62,7 @@ struct stm32_rng_private { struct reset_control *rst; const struct stm32_rng_data *data; bool ced; + bool lock_conf; }; /* @@ -301,6 +302,9 @@ static int stm32_rng_init(struct hwrng *rng) reg &= ~RNG_CR_CONDRST; reg |= RNG_CR_RNGEN; + if (priv->lock_conf) + reg |= RNG_CR_CONFLOCK; + writel_relaxed(reg, priv->base + RNG_CR); err = readl_relaxed_poll_timeout_atomic(priv->base + RNG_CR, reg, @@ -439,6 +443,7 @@ static int stm32_rng_probe(struct platform_device *ofdev) } priv->ced = of_property_read_bool(np, "clock-error-detect"); + priv->lock_conf = of_property_read_bool(np, "st,rng-lock-conf"); priv->data = of_device_get_match_data(dev); if (!priv->data)