From patchwork Mon Dec 14 16:04:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Brugger X-Patchwork-Id: 11972413 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=-17.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 BB08AC2BB48 for ; Mon, 14 Dec 2020 16:06:21 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7B69022582 for ; Mon, 14 Dec 2020 16:06:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7B69022582 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=K1DeLt7J5n7aPRLl3rfpo50SCwthotWSgBUmh6ib3CE=; b=NR4PI/chpMeazAKnn4dK9oSETW 70JibiKlLxMmVWchtbAUzIzxSH3Fz6AV763DzWm4hUD+q+yWEeyVU7LVJQu6Lg+TQY2rfKZITa4PH +JwhjplOg8vmGbLgqkAk0Y79mWBNx2lly7Pi+jpW26B/rsvO2QOhZRIqLblAmu60UDzs3RNDX9zB9 7ZZaoo80V5Zrvwi4e3f8F+yKv4egN856lwS4/oke0xuhKNshIbhZzhYQloF1MhI21onwSyLARbdgE UYe2CZfPSQHswGEhZpeE9tUn+UB1SeHrDM4BZlYGUw5Sznj0mtjdHLUDD/CGEYi+5vFq39dOjCKmm MjzdBXAw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1koqLS-0005Am-2I; Mon, 14 Dec 2020 16:05:06 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1koqLQ-0005AC-1Q for linux-arm-kernel@lists.infradead.org; Mon, 14 Dec 2020 16:05:04 +0000 From: matthias.bgg@kernel.org Authentication-Results: mail.kernel.org; dkim=permerror (bad message/signature format) To: mpm@selenic.com, herbert@gondor.apana.org.au, rjui@broadcom.com, sbranden@broadcom.com, f.fainelli@gmail.com Subject: [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block. Date: Mon, 14 Dec 2020 17:04:53 +0100 Message-Id: <20201214160454.22769-1-matthias.bgg@kernel.org> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201214_110504_157082_3C30D3DA X-CRM114-Status: GOOD ( 10.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Matthias Brugger , linux-kernel@vger.kernel.org, Julia.Lawall@inria.fr, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, nsaenzjulienne@suse.de, linux-crypto@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Matthias Brugger When trying to disable the block we bitwise or the control register with value zero. This will leave the block always turned on. Fix this by setting the corresponding bit to zero. Fixes: c83d45d5685f ("hwrng: iproc-rng200 - Add Broadcom IPROC RNG driver") Signed-off-by: Matthias Brugger Acked-by: Florian Fainelli --- drivers/char/hw_random/iproc-rng200.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c index 01583faf9893..e106ce3c0146 100644 --- a/drivers/char/hw_random/iproc-rng200.c +++ b/drivers/char/hw_random/iproc-rng200.c @@ -28,7 +28,6 @@ #define RNG_CTRL_OFFSET 0x00 #define RNG_CTRL_RNG_RBGEN_MASK 0x00001FFF #define RNG_CTRL_RNG_RBGEN_ENABLE 0x00000001 -#define RNG_CTRL_RNG_RBGEN_DISABLE 0x00000000 #define RNG_SOFT_RESET_OFFSET 0x04 #define RNG_SOFT_RESET 0x00000001 @@ -61,7 +60,7 @@ static void iproc_rng200_restart(void __iomem *rng_base) /* Disable RBG */ val = ioread32(rng_base + RNG_CTRL_OFFSET); val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val |= RNG_CTRL_RNG_RBGEN_DISABLE; + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; iowrite32(val, rng_base + RNG_CTRL_OFFSET); /* Clear all interrupt status */ @@ -174,7 +173,7 @@ static void iproc_rng200_cleanup(struct hwrng *rng) /* Disable RNG hardware */ val = ioread32(priv->base + RNG_CTRL_OFFSET); val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val |= RNG_CTRL_RNG_RBGEN_DISABLE; + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; iowrite32(val, priv->base + RNG_CTRL_OFFSET); } From patchwork Mon Dec 14 16:04:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Brugger X-Patchwork-Id: 11972411 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=-17.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 988E7C4361B for ; Mon, 14 Dec 2020 16:06:21 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 531B62253D for ; 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Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1koqLX-0005Bd-Ay; Mon, 14 Dec 2020 16:05:11 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1koqLS-0005Ar-Bg for linux-arm-kernel@lists.infradead.org; Mon, 14 Dec 2020 16:05:07 +0000 From: matthias.bgg@kernel.org Authentication-Results: mail.kernel.org; dkim=permerror (bad message/signature format) To: mpm@selenic.com, herbert@gondor.apana.org.au, rjui@broadcom.com, sbranden@broadcom.com, f.fainelli@gmail.com Subject: [PATCH 2/2] hwrng: iproc-rng200: Move enable/disable in separate function Date: Mon, 14 Dec 2020 17:04:54 +0100 Message-Id: <20201214160454.22769-2-matthias.bgg@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201214160454.22769-1-matthias.bgg@kernel.org> References: <20201214160454.22769-1-matthias.bgg@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201214_110506_536098_597EF42B X-CRM114-Status: GOOD ( 12.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Matthias Brugger , linux-kernel@vger.kernel.org, Julia.Lawall@inria.fr, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, nsaenzjulienne@suse.de, linux-crypto@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Matthias Brugger We are calling the same code for enable and disable the block in various parts of the driver. Put that code into a new function to reduce code duplication. Signed-off-by: Matthias Brugger Acked-by: Florian Fainelli --- drivers/char/hw_random/iproc-rng200.c | 37 ++++++++++++--------------- 1 file changed, 17 insertions(+), 20 deletions(-) diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c index e106ce3c0146..3367b26085e8 100644 --- a/drivers/char/hw_random/iproc-rng200.c +++ b/drivers/char/hw_random/iproc-rng200.c @@ -53,15 +53,26 @@ struct iproc_rng200_dev { #define to_rng_priv(rng) container_of(rng, struct iproc_rng200_dev, rng) -static void iproc_rng200_restart(void __iomem *rng_base) +static void iproc_rng200_enable(void __iomem *rng_base, bool enable) { uint32_t val; - /* Disable RBG */ val = ioread32(rng_base + RNG_CTRL_OFFSET); val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; + + if (enable) + val |= RNG_CTRL_RNG_RBGEN_ENABLE; + else + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; + iowrite32(val, rng_base + RNG_CTRL_OFFSET); +} + +static void iproc_rng200_restart(void __iomem *rng_base) +{ + uint32_t val; + + iproc_rng200_enable(rng_base, false); /* Clear all interrupt status */ iowrite32(0xFFFFFFFFUL, rng_base + RNG_INT_STATUS_OFFSET); @@ -83,11 +94,7 @@ static void iproc_rng200_restart(void __iomem *rng_base) val &= ~RBG_SOFT_RESET; iowrite32(val, rng_base + RBG_SOFT_RESET_OFFSET); - /* Enable RBG */ - val = ioread32(rng_base + RNG_CTRL_OFFSET); - val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val |= RNG_CTRL_RNG_RBGEN_ENABLE; - iowrite32(val, rng_base + RNG_CTRL_OFFSET); + iproc_rng200_enable(rng_base, true); } static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max, @@ -154,13 +161,8 @@ static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max, static int iproc_rng200_init(struct hwrng *rng) { struct iproc_rng200_dev *priv = to_rng_priv(rng); - uint32_t val; - /* Setup RNG. */ - val = ioread32(priv->base + RNG_CTRL_OFFSET); - val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val |= RNG_CTRL_RNG_RBGEN_ENABLE; - iowrite32(val, priv->base + RNG_CTRL_OFFSET); + iproc_rng200_enable(priv->base, true); return 0; } @@ -168,13 +170,8 @@ static int iproc_rng200_init(struct hwrng *rng) static void iproc_rng200_cleanup(struct hwrng *rng) { struct iproc_rng200_dev *priv = to_rng_priv(rng); - uint32_t val; - /* Disable RNG hardware */ - val = ioread32(priv->base + RNG_CTRL_OFFSET); - val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; - iowrite32(val, priv->base + RNG_CTRL_OFFSET); + iproc_rng200_enable(priv->base, false); } static int iproc_rng200_probe(struct platform_device *pdev)