From patchwork Thu Sep 21 08:02:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gatien CHEVALLIER X-Patchwork-Id: 13393753 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 7D4F7E706E3 for ; Thu, 21 Sep 2023 08:05:11 +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:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=60lemIBgSTfKv3LArd53SL9bsIpUnW0eV5SbDNWMu78=; b=bpxuQeo5BjmWFV tVaCVdG6HV+t8BWN07ORmxjN4S3TC6wmotLWUC6lsmpu9iaGmiMeonWdZFp04SK+9D4dD5+wXEIS5 k+2FfkNfhBiTeG/QOZYnt4W0AF/mMNG0M3p2+SN9kaT/CSkvSOfEafcQSRjn3hAbgySZJcVmvG0NE 9A1GrAfmYC7z5PsG5IDGZXkDwtYGeY5NPAgY89MApt+BI9jJUYo0D0o0tavEUv+G6W9q6nXwRxf2M mjsTgB5gxHAznu1Uf025kjYeXAFmLMWybuZv8DIWHU63/N1I/U239nnB6QXAvIsxyNN58zjKPif2/ SSfdolcng4h+4owaoDxw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qjEg0-005Rm5-1R; Thu, 21 Sep 2023 08:04:44 +0000 Received: from mx07-00178001.pphosted.com ([185.132.182.106]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qjEfu-005RjO-2z for linux-arm-kernel@lists.infradead.org; Thu, 21 Sep 2023 08:04:40 +0000 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 38L50Fug031087; Thu, 21 Sep 2023 10:04:25 +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=TJ g25FQ+BD3gx5nUATcc3daJwtIXtmhJ9wrgLm6gM0sDaPrNqL+K3myFzLUpGThAVI r6ANFSbmbyCSHuWclAZtgq+Jw65/CEdQknwzuWGKNOSLUL+ZyqYMS0tI/1pfivel c45O8evQ4IF4as5rLhuW3OP0t/ldQ0L/sjdXwhKRGs9yeaaX8WIbFHdcjoQQXoXo ua/ZFCBhntrzLuxFTWyxdzWKbF6behiA0BE03f9ltaTgc6A/ZJ5yScXHe9LuiFR3 lEyB2w6zrSageCX/G5l+WnGaTbEFcbrYs+V8HLjzX8vc1XCevcnBLrGrzxRr4nUO tpCtRhLP81BpCydfw89A== 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 3t51sfkb9y-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 21 Sep 2023 10:04:25 +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 D516B10005C; Thu, 21 Sep 2023 10:04:23 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id CD4BB21863D; Thu, 21 Sep 2023 10:04:23 +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; Thu, 21 Sep 2023 10:04:23 +0200 From: Gatien Chevallier To: Olivia Mackall , Herbert Xu , Rob Herring , Krzysztof Kozlowski , Maxime Coquelin , Alexandre Torgue CC: Lionel Debieve , , , , , , Gatien Chevallier Subject: [PATCH v3 7/9] hwrng: stm32 - support RNG configuration locking mechanism Date: Thu, 21 Sep 2023 10:02:59 +0200 Message-ID: <20230921080301.253563-8-gatien.chevallier@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230921080301.253563-1-gatien.chevallier@foss.st.com> References: <20230921080301.253563-1-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:18.0.980,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-21_06,2023-09-20_01,2023-05-22_02 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230921_010439_473268_09D0F4E4 X-CRM114-Status: GOOD ( 12.30 ) 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 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)