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Signed-off-by: Markus Mayer Reviewed-by: Krzysztof Kozlowski --- .../bindings/rng/brcm,bcm74110-rng.yaml | 35 +++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/devicetree/bindings/rng/brcm,bcm74110-rng= .yaml diff --git a/Documentation/devicetree/bindings/rng/brcm,bcm74110-rng.yaml b= /Documentation/devicetree/bindings/rng/brcm,bcm74110-rng.yaml new file mode 100644 index 000000000000..8e89d4a70b53 --- /dev/null +++ b/Documentation/devicetree/bindings/rng/brcm,bcm74110-rng.yaml @@ -0,0 +1,35 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/rng/brcm,bcm74110-rng.yaml# +$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@83ba000 { + compatible =3D "brcm,bcm74110-rng"; + reg =3D <0x83ba000 0x14>; + }; --=20 2.47.0 From nobody Sun Nov 24 20:32:24 2024 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 911B41E2846 for ; Fri, 1 Nov 2024 21:13:53 +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=1730495636; cv=none; b=mw7lLXYCaY2FDjvd78Ky1X7NnLsbDcXtu4SLM8xLAN5kR3mbrx1HkXAQJdpLmIGOXRsN1RMWFRUw7WCE4MRWbEy2TNPPseMtlyFED8f8u5lFTJ45giZ9fK9TiTQWQws1A/Xesm0yRB5D5ZLvd2K88A3OvULJ27xiLAFvwY79v8M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730495636; c=relaxed/simple; bh=tTKJWC4m/dcrSDCuI7wOwicEJ8xN9VnFDvBp4okD5vI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=atjV80MApf3Pp7IzMcFNEULcHhPPGa2MoDIvdtZkvl4jMy3vWHCX34A785wus70cBX5/l7YgqIO+iUJKmjGIzSSLHLko7MOM5QhT0rULqvVfFk5a1y5+BMYb6hA/JdHXjp5d7PbmuJD3trRLFyIJsmuNQpivajCqO26zi/qo7j4= ARC-Authentication-Results: i=1; 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Fri, 01 Nov 2024 14:13:52 -0700 (PDT) Received: from lbrmn-mmayer.ric.broadcom.net ([192.19.161.248]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-211057c076bsm25305715ad.197.2024.11.01.14.13.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Nov 2024 14:13:52 -0700 (PDT) Received: by lbrmn-mmayer.ric.broadcom.net (Postfix, from userid 1000) id 80188A82; Fri, 1 Nov 2024 14:13:51 -0700 (PDT) From: Markus Mayer To: Olivia Mackall , Herbert Xu , Aurelien Jarno , Conor Dooley , Daniel Golle , Florian Fainelli , Francesco Dolcini , Krzysztof Kozlowski , Rob Herring Cc: Markus Mayer , Device Tree Mailing List , Linux Crypto Mailing List , Linux Kernel Mailing List Subject: [PATCH v2 2/2] hwrng: bcm74110 - Add Broadcom BCM74110 RNG driver Date: Fri, 1 Nov 2024 14:13:15 -0700 Message-ID: <20241101211316.91345-3-mmayer@broadcom.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241101211316.91345-1-mmayer@broadcom.com> References: <20241101211316.91345-1-mmayer@broadcom.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a driver for the random number generator present on the Broadcom BCM74110 SoC. Signed-off-by: Markus Mayer --- drivers/char/hw_random/Kconfig | 13 +++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/bcm74110-rng.c | 125 ++++++++++++++++++++++++++ 3 files changed, 139 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..e665581e2324 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -99,6 +99,19 @@ config HW_RANDOM_BCM2835 =20 If unsure, say Y. =20 +config HW_RANDOM_BCM74110 + tristate "Broadcom BCM74110 Random Number Generator support" + depends on 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/Makef= ile index 01f012eab440..283791f5462d 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -31,6 +31,7 @@ obj-$(CONFIG_HW_RANDOM_POWERNV) +=3D powernv-rng.o obj-$(CONFIG_HW_RANDOM_HISI) +=3D hisi-rng.o obj-$(CONFIG_HW_RANDOM_HISTB) +=3D histb-rng.o obj-$(CONFIG_HW_RANDOM_BCM2835) +=3D bcm2835-rng.o +obj-$(CONFIG_HW_RANDOM_BCM74110) +=3D bcm74110-rng.o obj-$(CONFIG_HW_RANDOM_IPROC_RNG200) +=3D iproc-rng200.o obj-$(CONFIG_HW_RANDOM_ST) +=3D st-rng.o obj-$(CONFIG_HW_RANDOM_XGENE) +=3D 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 =3D (struct bcm74110_priv *)rng->priv; + void __iomem *fc_addr =3D priv->base + HOST_FIFO_COUNT; + void __iomem *fd_addr =3D priv->base + HOST_FIFO_DATA; + unsigned underrun_count =3D 0; + u32 max_words =3D 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 =3D bcm74110_rng_fifo_count(fc_addr)) =3D=3D 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 (=3Dno 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 =3D max_words; + + /* Bail early if we run out of random numbers unexpectedly */ + for (i =3D 0; i < num_words && bcm74110_rng_fifo_count(fc_addr) > 0; i++) + ((u32 *)buf)[i] =3D readl_relaxed(fd_addr); + + return i * sizeof(u32); +} + +static struct hwrng bcm74110_hwrng =3D { + .read =3D bcm74110_rng_read, +}; + +static int bcm74110_rng_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct bcm74110_priv *priv; + int rc; + + priv =3D devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + bcm74110_hwrng.name =3D pdev->name; + bcm74110_hwrng.priv =3D (unsigned long)priv; + + priv->base =3D devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + rc =3D 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[] =3D { + { .compatible =3D "brcm,bcm74110-rng", }, + {}, +}; +MODULE_DEVICE_TABLE(of, bcm74110_rng_match); + +static struct platform_driver bcm74110_rng_driver =3D { + .driver =3D { + .name =3D KBUILD_MODNAME, + .of_match_table =3D bcm74110_rng_match, + }, + .probe =3D 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"); --=20 2.47.0