From patchwork Thu Mar 4 07:33:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= X-Patchwork-Id: 392851 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 2E944C4332E for ; Thu, 4 Mar 2021 07:34:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 037F664F0D for ; Thu, 4 Mar 2021 07:34:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231657AbhCDHeW (ORCPT ); Thu, 4 Mar 2021 02:34:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57858 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230045AbhCDHdx (ORCPT ); Thu, 4 Mar 2021 02:33:53 -0500 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59BF7C061756; Wed, 3 Mar 2021 23:33:13 -0800 (PST) Received: by mail-wr1-x42f.google.com with SMTP id l12so26464505wry.2; Wed, 03 Mar 2021 23:33:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ZDWFW4D59r4xarZoIxLa/j/vBnqICsduu7IM4/DSrf4=; b=b2ZwyOBTI2YssCewCnmYBoM+ta8EIaOI8ht+SRQgxIsdSrNm/NBzk1zzDMKzMjnW1O kDyhfUVeN+v427rGi4HCgP5KBSyAnhcFDluRLQEsZPBVwhegQyyD9Gt711JOSIsylEF6 HwJYbAPa8MkakkgKPk6eqzyxiRthDQDjmSFfKkse33cRIfsUoo3LzFyHUXdqfdtaC9cj 3aE/Vo2NYQw0pTi+XLlr0DriMUCWabXDFGUKowsAu2s30IYO1Esto9PEdV6ik2M7ixoU W6hB6mWB80SofCUIKMVLTS8EE1UFVeuYU9CJzqnY8wclg9iNNtxTpOAO1ySNGZmjQeGe +Hbw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ZDWFW4D59r4xarZoIxLa/j/vBnqICsduu7IM4/DSrf4=; b=KTJqMRSAgG8tCktjPdzGegDz7y80F13qN1DCJ5w07NVdlaM5a5qbmqarDzx2ZXFiYH DMy3VOOrvStrguDrxJIb7tqEAVzBR711HHQQddydkYgZmfk+QdDPISBZeY/crjiy4E3O 1wYTfOG6iLgMKKDc9qcchykJvrXO94Np1F+8l5nSov8q6j4mF7XBTdIl1KyV0Hf9R2Cv nISoqr0aAPcCuCAiU8YsZI/mjcFhiCR50BuBMDGdr6IVvIK9xlJDOBusDZVt/6KUPFR2 w/XnD1MspK8PyYMPPHgMeafVad9VCCY9NKHgC/udVnS2qPJXKpDHj3eUtPAyPKDUhTVc V1+g== X-Gm-Message-State: AOAM530UIk1wP73nVmeUUS+uCWtlOp/5z7RdBXRySKuAQ26mpUl9F9NL fWBcLy1p2u6C94a7XFs9hBg= X-Google-Smtp-Source: ABdhPJwNam8gkxsOGlHGUb71EYTwmyUes8Yz141STO80JOn+6iaAdcFmh4IpCO1CNfA71CRk0VfYZA== X-Received: by 2002:adf:f512:: with SMTP id q18mr2475250wro.61.1614843192006; Wed, 03 Mar 2021 23:33:12 -0800 (PST) Received: from skynet.lan (170.red-88-1-105.dynamicip.rima-tde.net. [88.1.105.170]) by smtp.gmail.com with ESMTPSA id j30sm18328811wrj.62.2021.03.03.23.33.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Mar 2021 23:33:11 -0800 (PST) From: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= To: Matt Mackall , Herbert Xu , Rob Herring , Nicolas Saenz Julienne , Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Philipp Zabel , Neil Armstrong , Alexandru Ardelean , Bjorn Andersson , Guenter Roeck , Rikard Falkeborn , Stefan Wahren , linux-crypto@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= Subject: [PATCH v5 1/2] dt-bindings: rng: bcm2835: document reset support Date: Thu, 4 Mar 2021 08:33:07 +0100 Message-Id: <20210304073308.25906-2-noltari@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210304073308.25906-1-noltari@gmail.com> References: <20210304073308.25906-1-noltari@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Some devices may need to perform a reset before using the RNG, such as the BCM6368. Signed-off-by: Álvaro Fernández Rojas --- v5: no changes. v4: pass dt_binding_check. v3: make resets required if brcm,bcm6368-rng. v2: document reset support. .../devicetree/bindings/rng/brcm,bcm2835.yaml | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/Documentation/devicetree/bindings/rng/brcm,bcm2835.yaml b/Documentation/devicetree/bindings/rng/brcm,bcm2835.yaml index c147900f9041..11c23e1f6988 100644 --- a/Documentation/devicetree/bindings/rng/brcm,bcm2835.yaml +++ b/Documentation/devicetree/bindings/rng/brcm,bcm2835.yaml @@ -37,6 +37,21 @@ required: additionalProperties: false +if: + properties: + compatible: + enum: + - brcm,bcm6368-rng +then: + properties: + resets: + maxItems: 1 + required: + - resets +else: + properties: + resets: false + examples: - | rng@7e104000 { @@ -58,4 +73,6 @@ examples: clocks = <&periph_clk 18>; clock-names = "ipsec"; + + resets = <&periph_rst 4>; }; From patchwork Thu Mar 4 07:33:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= X-Patchwork-Id: 392850 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 5B377C4332D for ; Thu, 4 Mar 2021 07:34:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2F59964F0A for ; Thu, 4 Mar 2021 07:34:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231781AbhCDHeX (ORCPT ); Thu, 4 Mar 2021 02:34:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57864 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231636AbhCDHdy (ORCPT ); Thu, 4 Mar 2021 02:33:54 -0500 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 47AC9C06175F; Wed, 3 Mar 2021 23:33:14 -0800 (PST) Received: by mail-wr1-x430.google.com with SMTP id v15so26485454wrx.4; Wed, 03 Mar 2021 23:33:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=nKsLCh+6twuWj2QnD4IJjKFGoE1CDwaYbrWfJko6FQg=; b=PM7DH0DCgsIy5KSnYy4NPGqpPLALl4pHepSUZZp+7gOWJK/nz8Cz3HaJfTuSI0XoDj 7W6ocLN/+Ck53cPaHif72uqdFR8IiKtjfe8ZzgHHNZ1zEw+4iNtm+im5JY0byoAfaanA yTZSJK/DA5FsOdDzB0svKlw5k5Y4rfUPR46dUY89crhuOIdq9vSRSKke3o1tazJSV1sv kP6vDEogVfnhL8SMMwesYUuAv8T1j3EyIJRwWqsT6RYdQ63KyXMi7maXcIhXTrxD7dh9 D9UElGzyGEqZ8eEciUuFBUautAbwuNulbr2Vh8bZVL1wnWpXLZqxoOUSwcGOJoDZ1I81 By0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=nKsLCh+6twuWj2QnD4IJjKFGoE1CDwaYbrWfJko6FQg=; b=rjPhipiA2RT73TihznkBWeSgsMLkdS6TTGYRPt1JrSUdqQqwQDNsc6gWFhpZQVvoui flDo+YbG/6RcU6A9yjhgdfJC2zUBa2bhB5hd1qMcCWV4564oWG27vmw1QXbYeq0FN1UE kFWRFvqbwhfjCwCdCJaZs74BkezTuyuwktWKyRPenyJ0UDuhAL8G0EqKJ41USiiGRgoU cmynDfRhYIFKawGBH1rJpdBrFM1GPz8zBuiMfJU7pt4LgCMpPTOCVdC8+6l9SzyWOwV0 s818y0SpzhFtnNgmQpv4KEUEu0t4UHR4751yrz3+PbtuEExBJ0U8gBkVR2XFgSuS2v2O nZ9Q== X-Gm-Message-State: AOAM530394qZCV8BoQe9/uVOnTaL6ePiK9dcS6mPtw5EtQipooBcMx0m plvVmOglPe/aoKrQFsFhXdo= X-Google-Smtp-Source: ABdhPJwnhIZqeUh7kvfjBKqyBCUniY00joSs9fOdx+kTifv4VoGxHTeO1PV7UoAn6mVxjXF8LRcCjw== X-Received: by 2002:a5d:5051:: with SMTP id h17mr2538503wrt.80.1614843193036; Wed, 03 Mar 2021 23:33:13 -0800 (PST) Received: from skynet.lan (170.red-88-1-105.dynamicip.rima-tde.net. [88.1.105.170]) by smtp.gmail.com with ESMTPSA id j30sm18328811wrj.62.2021.03.03.23.33.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Mar 2021 23:33:12 -0800 (PST) From: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= To: Matt Mackall , Herbert Xu , Rob Herring , Nicolas Saenz Julienne , Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Philipp Zabel , Neil Armstrong , Alexandru Ardelean , Bjorn Andersson , Guenter Roeck , Rikard Falkeborn , Stefan Wahren , linux-crypto@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= Subject: [PATCH v5 2/2] hwrng: bcm2835: add reset support Date: Thu, 4 Mar 2021 08:33:08 +0100 Message-Id: <20210304073308.25906-3-noltari@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210304073308.25906-1-noltari@gmail.com> References: <20210304073308.25906-1-noltari@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org BCM6368 devices need to reset the in order to generate true random numbers. This is what BCM6368 produces without a reset: root@OpenWrt:/# cat /dev/hwrng | rngtest -c 1000 rngtest 6.10 Copyright (c) 2004 by Henrique de Moraes Holschuh This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. rngtest: starting FIPS tests... rngtest: bits received from input: 20000032 rngtest: FIPS 140-2 successes: 0 rngtest: FIPS 140-2 failures: 1000 rngtest: FIPS 140-2(2001-10-10) Monobit: 2 rngtest: FIPS 140-2(2001-10-10) Poker: 1000 rngtest: FIPS 140-2(2001-10-10) Runs: 1000 rngtest: FIPS 140-2(2001-10-10) Long run: 30 rngtest: FIPS 140-2(2001-10-10) Continuous run: 0 rngtest: input channel speed: (min=37.253; avg=320.827; max=635.783)Mibits/s rngtest: FIPS tests speed: (min=12.141; avg=15.034; max=16.428)Mibits/s rngtest: Program run time: 1336176 microseconds cat: write error: Broken pipe Signed-off-by: Álvaro Fernández Rojas --- v5: remove reset_control_rearm(). v4: add reset_control_rearm(). v3: no changes. v2: no changes. drivers/char/hw_random/bcm2835-rng.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c index be5be395b341..e7dd457e9b22 100644 --- a/drivers/char/hw_random/bcm2835-rng.c +++ b/drivers/char/hw_random/bcm2835-rng.c @@ -13,6 +13,7 @@ #include #include #include +#include #define RNG_CTRL 0x0 #define RNG_STATUS 0x4 @@ -32,6 +33,7 @@ struct bcm2835_rng_priv { void __iomem *base; bool mask_interrupts; struct clk *clk; + struct reset_control *reset; }; static inline struct bcm2835_rng_priv *to_rng_priv(struct hwrng *rng) @@ -92,6 +94,10 @@ static int bcm2835_rng_init(struct hwrng *rng) if (ret) return ret; + ret = reset_control_reset(priv->reset); + if (ret) + return ret; + if (priv->mask_interrupts) { /* mask the interrupt */ val = rng_readl(priv, RNG_INT_MASK); @@ -156,6 +162,10 @@ static int bcm2835_rng_probe(struct platform_device *pdev) if (IS_ERR(priv->clk)) return PTR_ERR(priv->clk); + priv->reset = devm_reset_control_get_optional_exclusive(dev, NULL); + if (IS_ERR(priv->reset)) + return PTR_ERR(priv->reset); + priv->rng.name = pdev->name; priv->rng.init = bcm2835_rng_init; priv->rng.read = bcm2835_rng_read;