From patchwork Wed Oct 30 21:33:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Mayer X-Patchwork-Id: 839906 Received: from mail-pf1-f177.google.com (mail-pf1-f177.google.com [209.85.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7FFEF215C61 for ; Wed, 30 Oct 2024 21:34:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730324074; cv=none; b=nuJrzXYmuVrA4shMbKR223UuF798OnJvYQZD3/SEbpGt8Y76r9iBtq6iLueI0Z4X51O3xhLVqzZmgT0E7JOXnk+h9rs8QQs6jblTJasbK1N2VZS+7JqGUdEDd3ePqyGc3ohJjVCVOUcbtwH8FWGmyR6vKmTuKK6Z2ZqZszODUIE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730324074; c=relaxed/simple; bh=uIj9bxjJ+UW3J2+LRlRVni9rzPoTuE/3qRjSbZzsgs4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WN9hyev5dH6b3fZxjk/DmzQuDClwTUJW3MDv6ecKky+ixn2NX50WFe+wrfuBDVEuRWOwga5xHklpL+Jc9yQVJnMqvrYFNq7sb+ylJBLIwKrgAscHMY7CxQvQHHY2l0U92p6BXlG/uITStBy0xvCc69wPLnqMpC3yAqFRlARsATA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com; spf=fail smtp.mailfrom=broadcom.com; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b=UWhXvd86; arc=none smtp.client-ip=209.85.210.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=broadcom.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="UWhXvd86" Received: by mail-pf1-f177.google.com with SMTP id d2e1a72fcca58-72097a5ca74so199388b3a.3 for ; Wed, 30 Oct 2024 14:34:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1730324072; x=1730928872; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=miG/1HK0adKG95UFlClqKo0MqYdFiIcf0KaOP4hdkuk=; b=UWhXvd86RxG5wYWz3wjWeo53kXYpw2qGUQx2nVUYlsON+RFAwrKykvldvnsyQ6Dlxs VBF1Hx7livRkTegAYpuXk82/7TlfVEceQjvu2WTEefALM0yEE/7aYVmss2r5ffkC6YEj fDH9vHXbTE58MCj+62cY3MmZM4uaPiojcjXiw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730324072; x=1730928872; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=miG/1HK0adKG95UFlClqKo0MqYdFiIcf0KaOP4hdkuk=; b=b7UZlHcGtKVBGvXJ2Hx7w9DSs0C3ICMEKiDMpNDBbyWo/Z3f2SLlvh+spwEO6JtqNZ ij0/fjg0QF4LBgk02wYaOXazB34rmJIURiv4Btxdsf6/gg7wLoSXPQxU6L3rEp+/OWRU 3VRPfSalYMbkr50FQwbDGY5W3yRQVSLCTFuE1vTV0vhUD9HNyoUhtCY0T6ftnN7kq7mH +LEaWRSVK9oRLs/TMNnWUjnH+/W7gRr14wDCXTi08doI61TVRzrDeBTjzjGBpZK6zjCK swkYPxK4x+xq3VHBCQ0H5e7o8oSIezp5uminvXHT5SmDdnZPEjnV7KVpGMDnaC784Dmg 0PJQ== X-Forwarded-Encrypted: i=1; AJvYcCXuhfb487JfOp1tnjjJAulfuOElbNw5F/dFaprSd1QoQOYQwGc6YARDYPRNbtab5ZYjOIrFZQxqFl1oHxM=@vger.kernel.org X-Gm-Message-State: AOJu0YwBFUFI79TNj4S78B0iXdkP4JpXIB0QU7Gq2rNzuRlREpB3M4FZ 57hZqulir4Ged12MXEj/aED+Mo6sWVmSitZ4l5KmpRRPkHh3s0kWGx7D1VnvOw== X-Google-Smtp-Source: AGHT+IEVlkxrvwpC6QCQmAunwAgGVoMYo+UQq+OVf0zsxgZEasH0PzCqxEDNUFZ/6ZGQgbWvwMF0aQ== X-Received: by 2002:a05:6a00:9296:b0:71e:b8:1930 with SMTP id d2e1a72fcca58-72062fd980fmr24280742b3a.16.1730324071522; Wed, 30 Oct 2024 14:34:31 -0700 (PDT) Received: from lbrmn-mmayer.ric.broadcom.net ([192.19.161.248]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-720bc1b892bsm95417b3a.13.2024.10.30.14.34.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Oct 2024 14:34:31 -0700 (PDT) Received: by lbrmn-mmayer.ric.broadcom.net (Postfix, from userid 1000) id 481BE888; Wed, 30 Oct 2024 14:34:30 -0700 (PDT) From: Markus Mayer To: Olivia Mackall , Herbert Xu , Aurelien Jarno , Conor Dooley , Daniel Golle , Florian Fainelli , Francesco Dolcini , Krzysztof Kozlowski , Krzysztof Kozlowski , Rob Herring Cc: Markus Mayer , Device Tree Mailing List , Linux Crypto Mailing List , Linux Kernel Mailing List Subject: [PATCH 1/2] dt-bindings: rng: add binding for BCM74110 RNG Date: Wed, 30 Oct 2024 14:33:54 -0700 Message-ID: <20241030213400.802264-2-mmayer@broadcom.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20241030213400.802264-1-mmayer@broadcom.com> References: <20241030213400.802264-1-mmayer@broadcom.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add a binding for the random number generator used on the BCM74110. Signed-off-by: Markus Mayer --- .../bindings/rng/brcm,bcm74110.yaml | 35 +++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/devicetree/bindings/rng/brcm,bcm74110.yaml diff --git a/Documentation/devicetree/bindings/rng/brcm,bcm74110.yaml b/Documentation/devicetree/bindings/rng/brcm,bcm74110.yaml new file mode 100644 index 000000000000..acd0856cee72 --- /dev/null +++ b/Documentation/devicetree/bindings/rng/brcm,bcm74110.yaml @@ -0,0 +1,35 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/rng/brcm,bcm74110.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: BCM74110 Random number generator + +description: | + Random number generator used on the BCM74110. + +maintainers: + - Markus Mayer + - Florian Fainelli + +properties: + compatible: + enum: + - brcm,bcm74110-rng + + reg: + maxItems: 1 + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + rng: rng@83ba000 { + compatible = "brcm,bcm74110-trng"; 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Signed-off-by: Markus Mayer --- drivers/char/hw_random/Kconfig | 14 +++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/bcm74110-rng.c | 125 ++++++++++++++++++++++++++ 3 files changed, 140 insertions(+) create mode 100644 drivers/char/hw_random/bcm74110-rng.c diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index b51d9e243f35..90ae35aeb23a 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -99,6 +99,20 @@ config HW_RANDOM_BCM2835 If unsure, say Y. +config HW_RANDOM_BCM74110 + tristate "Broadcom BCM74110 Random Number Generator support" + depends on ARCH_BCM2835 || ARCH_BCM_NSP || ARCH_BCM_5301X || \ + ARCH_BCMBCA || BCM63XX || ARCH_BRCMSTB || COMPILE_TEST + default HW_RANDOM + help + This driver provides kernel-side support for the Random Number + Generator hardware found on the Broadcom BCM74110 SoCs. + + To compile this driver as a module, choose M here: the + module will be called bcm74110-rng + + If unsure, say Y. + config HW_RANDOM_IPROC_RNG200 tristate "Broadcom iProc/STB RNG200 support" depends on ARCH_BCM_IPROC || ARCH_BCM2835 || ARCH_BRCMSTB || COMPILE_TEST diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 01f012eab440..283791f5462d 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -31,6 +31,7 @@ obj-$(CONFIG_HW_RANDOM_POWERNV) += powernv-rng.o obj-$(CONFIG_HW_RANDOM_HISI) += hisi-rng.o obj-$(CONFIG_HW_RANDOM_HISTB) += histb-rng.o obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o +obj-$(CONFIG_HW_RANDOM_BCM74110) += bcm74110-rng.o obj-$(CONFIG_HW_RANDOM_IPROC_RNG200) += iproc-rng200.o obj-$(CONFIG_HW_RANDOM_ST) += st-rng.o obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o diff --git a/drivers/char/hw_random/bcm74110-rng.c b/drivers/char/hw_random/bcm74110-rng.c new file mode 100644 index 000000000000..5c64148e91f1 --- /dev/null +++ b/drivers/char/hw_random/bcm74110-rng.c @@ -0,0 +1,125 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2024 Broadcom + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include + +#define HOST_REV_ID 0x00 +#define HOST_FIFO_DEPTH 0x04 +#define HOST_FIFO_COUNT 0x08 +#define HOST_FIFO_THRESHOLD 0x0c +#define HOST_FIFO_DATA 0x10 + +#define HOST_FIFO_COUNT_MASK 0xffff + +/* Delay range in microseconds */ +#define FIFO_DELAY_MIN_US 3 +#define FIFO_DELAY_MAX_US 7 +#define FIFO_DELAY_MAX_COUNT 10 + +struct bcm74110_priv { + void __iomem *base; +}; + +static inline int bcm74110_rng_fifo_count(void __iomem *mem) +{ + return readl_relaxed(mem) & HOST_FIFO_COUNT_MASK; +} + +static int bcm74110_rng_read(struct hwrng *rng, void *buf, size_t max, + bool wait) +{ + struct bcm74110_priv *priv = (struct bcm74110_priv *)rng->priv; + void __iomem *fc_addr = priv->base + HOST_FIFO_COUNT; + void __iomem *fd_addr = priv->base + HOST_FIFO_DATA; + unsigned underrun_count = 0; + u32 max_words = max / sizeof(u32); + u32 num_words; + unsigned i; + + /* + * We need to check how many words are available in the RNG FIFO. If + * there aren't any, we need to wait for some to become available. + */ + while ((num_words = bcm74110_rng_fifo_count(fc_addr)) == 0) { + if (!wait) + return 0; + /* + * As a precaution, limit how long we wait. If the FIFO doesn't + * refill within the allotted time, return 0 (=no data) to the + * caller. + */ + if (likely(underrun_count < FIFO_DELAY_MAX_COUNT)) + usleep_range(FIFO_DELAY_MIN_US, FIFO_DELAY_MAX_US); + else + return 0; + underrun_count++; + } + if (num_words > max_words) + num_words = max_words; + + /* Bail early if we run out of random numbers unexpectedly */ + for (i = 0; i < num_words && bcm74110_rng_fifo_count(fc_addr) > 0; i++) + ((u32 *)buf)[i] = readl_relaxed(fd_addr); + + return i * sizeof(u32); +} + +static struct hwrng bcm74110_hwrng = { + .read = bcm74110_rng_read, +}; + +static int bcm74110_rng_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct bcm74110_priv *priv; + int rc; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + bcm74110_hwrng.name = pdev->name; + bcm74110_hwrng.priv = (unsigned long)priv; + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + rc = devm_hwrng_register(dev, &bcm74110_hwrng); + if (rc) + dev_err(dev, "hwrng registration failed (%d)\n", rc); + else + dev_info(dev, "hwrng registered\n"); + + return rc; +} + +static const struct of_device_id bcm74110_rng_match[] = { + { .compatible = "brcm,bcm74110-rng", }, + {}, +}; +MODULE_DEVICE_TABLE(of, bcm74110_rng_match); + +static struct platform_driver bcm74110_rng_driver = { + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = bcm74110_rng_match, + }, + .probe = bcm74110_rng_probe, +}; +module_platform_driver(bcm74110_rng_driver); + +MODULE_AUTHOR("Markus Mayer "); +MODULE_DESCRIPTION("BCM 74110 Random Number Generator (RNG) driver"); +MODULE_LICENSE("GPL v2");