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[88.1.105.170]) by smtp.gmail.com with ESMTPSA id u12sm3057190wmq.38.2021.02.23.09.00.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Feb 2021 09:00:11 -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 , Mark Brown , =?utf-8?q?=C3=81lvaro_Fern?= =?utf-8?q?=C3=A1ndez_Rojas?= , Guenter Roeck , Bjorn Andersson , =?utf-8?b?TsOtY29sYXMgRi4gUi4gQS4gUHJh?= =?utf-8?q?do?= , 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 Subject: [PATCH v3 1/2] dt-bindings: rng: bcm2835: document reset support Date: Tue, 23 Feb 2021 18:00:05 +0100 Message-Id: <20210223170006.29558-2-noltari@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210223170006.29558-1-noltari@gmail.com> References: <20210222194510.14004-1-noltari@gmail.com> <20210223170006.29558-1-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 --- 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 Tue Feb 23 16:01:31 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: 386340 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=ham 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 D4D8DC433E0 for ; Tue, 23 Feb 2021 16:02:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ADC0764E60 for ; Tue, 23 Feb 2021 16:02:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233316AbhBWQCY (ORCPT ); Tue, 23 Feb 2021 11:02:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49014 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233315AbhBWQCW (ORCPT ); Tue, 23 Feb 2021 11:02:22 -0500 Received: from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com [IPv6:2a00:1450:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 91691C06174A; Tue, 23 Feb 2021 08:01:39 -0800 (PST) Received: by mail-wr1-x42c.google.com with SMTP id b3so23092088wrj.5; Tue, 23 Feb 2021 08:01:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=s5r6aoP8yUhDgWY4u8j/36byZXYgA21Asmj6U6dj7SQ=; b=Z6dUngibA3k2Zhdndsnjl7qXctPhCY0w7C9P9gjVTv8imnAyzSJn0bI5LDTWyIJfbA 9fmGK7lYVVJmslUpoG7zLGtN62SB4i3w/4HlJMRcMaoX4BhRWnxH+WyP9M3jYWGQr//L ZL7UbFQja2YtcTPHeDh3pnrj7HOQF2NF3cCcTK7ziy4a5Ue2/hhVl/j01FNLQ6xM2knY M6cVgnFkw6TfTgN5zuBD/2JVOLUPGAnN7gOOTwtsB0YaXNZs+wm30PyZZqv5F+I2JRul BlnhwGYwhEAZ4Z59y5Z5oY/O7kY+Gvcg630FOankem2YkWX6NCLPMjbfUjb6eMh6GFTZ xa/Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=s5r6aoP8yUhDgWY4u8j/36byZXYgA21Asmj6U6dj7SQ=; b=HG9EfCYqe8gjuj1Gr3zut8Hh8ZNqowKSCvHX4YoeA2OuO/q5BfxoyByfGR1yVh636n mAu/eJwjnJvrFY/Rt/vpJ8JcovZFodYjLEPx5zFDGghUp6FegLCoaZb+cIDCpLhMvWGj ED5kRYOdBAziRdCLDlDUNkBjCOs7zeJHAhLfVxqiRowZMyuzulI1leAqOVFpZhJFnlWd WT4b2tcz1XcA9aDnEO3Pu2kUj4bGQj69s2FxsAI1VST4NfcS0CnJr/zNizeMlxEPDaVB 0B4ap7pe2phSxE5XpUQ5iTcr11ctdcvXUJwLmSZgRAUTaV6reI1VczCwIPT/zIg8qJRK I9fA== X-Gm-Message-State: AOAM532Rr9b7YEMmT1z8QSjU1OEHOnRcPD+FXKu3bCjx6ZkaBl6L5WSK SOusVr4HhYN3yWp7Zq2L9yk= X-Google-Smtp-Source: ABdhPJwupnnvXFwHC3i/kzK26c7qamwCkq7cEOkWgqeQU0/8URXkmDCziwuLip7VcGDHeBw3PlTXLw== X-Received: by 2002:a05:6000:1a8c:: with SMTP id f12mr26949127wry.173.1614096098283; Tue, 23 Feb 2021 08:01:38 -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 h15sm33999381wrh.13.2021.02.23.08.01.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Feb 2021 08:01:37 -0800 (PST) From: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= To: Matt Mackall , Herbert Xu , Rob Herring , Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Nicolas Saenz Julienne , Philipp Zabel , Alexandru Ardelean , Neil Armstrong , Lee Jones , =?utf-8?b?TsOtY29sYXMgRi4g?= =?utf-8?q?R=2E_A=2E_Prado?= , =?utf-8?b?w4FsdmFybyBGZXJuw6FuZGV6?= =?utf-8?q?_Rojas?= , 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 Subject: [PATCH 2/2] hwrng: bcm2835: add reset support Date: Tue, 23 Feb 2021 17:01:31 +0100 Message-Id: <20210223160131.29053-3-noltari@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210223160131.29053-1-noltari@gmail.com> References: <20210222194510.14004-1-noltari@gmail.com> <20210223160131.29053-1-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 Signed-off-by: Álvaro Fernández Rojas --- 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 1a7c43b43c6b..1b93a896d8e8 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) @@ -94,6 +96,10 @@ static int bcm2835_rng_init(struct hwrng *rng) 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); @@ -159,6 +165,10 @@ static int bcm2835_rng_probe(struct platform_device *pdev) if (PTR_ERR(priv->clk) == -EPROBE_DEFER) return -EPROBE_DEFER; + 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;