From patchwork Tue Aug 2 13:17:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomer Maimon X-Patchwork-Id: 1663019 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4LxwZr3Mfpz9sGp for ; Tue, 2 Aug 2022 23:20:04 +1000 (AEST) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4LxwZr15sBz2ywN for ; Tue, 2 Aug 2022 23:20:04 +1000 (AEST) X-Original-To: openbmc@lists.ozlabs.org Delivered-To: openbmc@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=softfail (domain owner discourages use of this host) smtp.mailfrom=nuvoton.com (client-ip=212.199.177.27; helo=herzl.nuvoton.co.il; envelope-from=tomer.maimon@nuvoton.com; receiver=) Received: from herzl.nuvoton.co.il (unknown [212.199.177.27]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4LxwXp2Bx2z2ywN for ; Tue, 2 Aug 2022 23:18:15 +1000 (AEST) Received: from NTILML01.nuvoton.com (ntil-fw [212.199.177.25]) by herzl.nuvoton.co.il (8.13.8/8.13.8) with ESMTP id 272DI4ia021466 for ; Tue, 2 Aug 2022 16:18:04 +0300 Received: from NTHCCAS01.nuvoton.com (10.1.8.28) by NTILML01.nuvoton.com (10.190.1.56) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.14; Tue, 2 Aug 2022 16:18:04 +0300 Received: from NTHCCAS04.nuvoton.com (10.1.8.29) by NTHCCAS01.nuvoton.com (10.1.8.28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2375.7; Tue, 2 Aug 2022 21:18:02 +0800 Received: from taln60.nuvoton.co.il (10.191.1.180) by NTHCCAS04.nuvoton.com (10.1.12.25) with Microsoft SMTP Server id 15.1.2176.2 via Frontend Transport; Tue, 2 Aug 2022 21:18:01 +0800 Received: by taln60.nuvoton.co.il (Postfix, from userid 10070) id 3694663A22; Tue, 2 Aug 2022 16:18:00 +0300 (IDT) From: Tomer Maimon To: Subject: [PATCH linux dev-5.15 v1 5/5] char: hwrng: npcm: Add NPCM8XX support Date: Tue, 2 Aug 2022 16:17:57 +0300 Message-ID: <20220802131757.234026-6-tmaimon77@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20220802131757.234026-1-tmaimon77@gmail.com> References: <20220802131757.234026-1-tmaimon77@gmail.com> MIME-Version: 1.0 X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: andrew@aj.id.au, joel@jms.id.au, Tomer Maimon Errors-To: openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "openbmc" Adding RNG NPCM8XX support to the NPCM RNG driver. RNG NPCM8XX uses a different clock prescaler. As part of adding NPCM8XX support: - Add NPCM8XX specific compatible string. - Set clock prescaler according to the NPCM BMC SoC. Signed-off-by: Tomer Maimon --- drivers/char/hw_random/npcm-rng.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/char/hw_random/npcm-rng.c b/drivers/char/hw_random/npcm-rng.c index 1ec5f267a656..3c7b632536fc 100644 --- a/drivers/char/hw_random/npcm-rng.c +++ b/drivers/char/hw_random/npcm-rng.c @@ -19,6 +19,7 @@ #define NPCM_RNGMODE_REG 0x08 /* Mode register */ #define NPCM_RNG_CLK_SET_25MHZ GENMASK(4, 3) /* 20-25 MHz */ +#define NPCM_RNG_CLK_SET_62_5MHZ BIT(2) /* 60-80 MHz */ #define NPCM_RNG_DATA_VALID BIT(1) #define NPCM_RNG_ENABLE BIT(0) #define NPCM_RNG_M1ROSEL BIT(1) @@ -31,14 +32,14 @@ struct npcm_rng { void __iomem *base; struct hwrng rng; + u32 clkp; }; static int npcm_rng_init(struct hwrng *rng) { struct npcm_rng *priv = to_npcm_rng(rng); - writel(NPCM_RNG_CLK_SET_25MHZ | NPCM_RNG_ENABLE, - priv->base + NPCM_RNGCS_REG); + writel(priv->clkp | NPCM_RNG_ENABLE, priv->base + NPCM_RNGCS_REG); return 0; } @@ -47,7 +48,7 @@ static void npcm_rng_cleanup(struct hwrng *rng) { struct npcm_rng *priv = to_npcm_rng(rng); - writel(NPCM_RNG_CLK_SET_25MHZ, priv->base + NPCM_RNGCS_REG); + writel(priv->clkp, priv->base + NPCM_RNGCS_REG); } static int npcm_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) @@ -102,6 +103,11 @@ static int npcm_rng_probe(struct platform_device *pdev) pm_runtime_use_autosuspend(&pdev->dev); pm_runtime_enable(&pdev->dev); + if (of_device_is_compatible(pdev->dev.of_node, "nuvoton,npcm750-rng")) + priv->clkp = NPCM_RNG_CLK_SET_25MHZ; + if (of_device_is_compatible(pdev->dev.of_node, "nuvoton,npcm845-rng")) + priv->clkp = NPCM_RNG_CLK_SET_62_5MHZ; + #ifndef CONFIG_PM priv->rng.init = npcm_rng_init; priv->rng.cleanup = npcm_rng_cleanup; @@ -163,6 +169,7 @@ static const struct dev_pm_ops npcm_rng_pm_ops = { static const struct of_device_id rng_dt_id[] __maybe_unused = { { .compatible = "nuvoton,npcm750-rng", }, + { .compatible = "nuvoton,npcm845-rng", }, {}, }; MODULE_DEVICE_TABLE(of, rng_dt_id);