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Wed, 22 Jul 2026 17:43:09 +0200 (CEST) X-CSE-ConnectionGUID: 5PVumhbPTFKS7fEtoezduw== X-CSE-MsgGUID: V7A7K56oQmyyGDs+TpuPcw== X-IronPort-AV: E=Sophos;i="6.25,178,1779174000"; d="scan'208";a="61010803" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa3.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 22 Jul 2026 08:43:07 -0700 Received: from chn-vm-ex01.mchp-main.com (10.10.85.143) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.58; Wed, 22 Jul 2026 08:43:06 -0700 Received: from jamie-dev.microchip.com (10.10.85.11) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server id 15.1.2507.58 via Frontend Transport; Wed, 22 Jul 2026 08:43:04 -0700 From: Jamie Gibbons To: CC: Conor Dooley , Valentina Fernandez Alanis , Tom Rini , "Leo Yu-Chi Liang" , Sughosh Ganu , Heinrich Schuchardt , Martin Herren , Michal Simek , Subject: [PATCH v2 3/6] rng: add Microchip PolarFire SoC hardware RNG driver Date: Wed, 22 Jul 2026 16:45:46 +0100 Message-ID: <20260722154602.3373184-4-jamie.gibbons@microchip.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260722154602.3373184-1-jamie.gibbons@microchip.com> References: <20260722154602.3373184-1-jamie.gibbons@microchip.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean X-Mailman-Approved-At: Thu, 23 Jul 2026 00:52:16 +0000 X-Mailman-Original-DKIM-Signature: v=1; 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spf=pass smtp.mailfrom=prvs=656eedf95=Jamie.Gibbons@microchip.com X-Mailman-Original-Authentication-Results: phobos.denx.de; dkim=pass (2048-bit key; unprotected) header.d=microchip.com header.i=@microchip.com header.b="tf6GnOBg"; dkim-atps=neutral X-BeenThere: u-boot@lists.u-boot-project.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.u-boot-project.org Sender: "U-Boot" Add a U-Boot RNG driver for Microchip's PolarFire SoC (MPFS). The hardware RNG is accessed indirectly via the MPFS system controller using the mailbox interface. The driver implements the UCLASS_RNG interface, requesting random data from the system controller and returning it to the caller. This allows use of the PolarFire SoC hardware RNG via the standard 'rng' command and DM RNG API. Signed-off-by: Jamie Gibbons --- drivers/rng/Kconfig | 7 +++ drivers/rng/Makefile | 1 + drivers/rng/mpfs_rng.c | 101 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 109 insertions(+) create mode 100644 drivers/rng/mpfs_rng.c diff --git a/drivers/rng/Kconfig b/drivers/rng/Kconfig index 19b2b707677..856ffda2f5e 100644 --- a/drivers/rng/Kconfig +++ b/drivers/rng/Kconfig @@ -23,6 +23,13 @@ config RNG_MESON Enable support for hardware random number generator of Amlogic Meson SoCs. +config RNG_MPFS + tristate "Microchip PolarFire SoC Random Number Generator support" + depends on DM_RNG && MPFS_SYSCONTROLLER + help + Enable support for hardware random number generator + of Microchip's PolarFire SoCs. + config RNG_SANDBOX bool "Sandbox random number generator" depends on SANDBOX diff --git a/drivers/rng/Makefile b/drivers/rng/Makefile index 30c58272d41..50622d4705f 100644 --- a/drivers/rng/Makefile +++ b/drivers/rng/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_$(PHASE_)DM_RNG) += rng-uclass.o obj-$(CONFIG_RNG_MESON) += meson-rng.o +obj-$(CONFIG_RNG_MPFS) += mpfs_rng.o obj-$(CONFIG_RNG_SANDBOX) += sandbox_rng.o obj-$(CONFIG_RNG_MSM) += msm_rng.o obj-$(CONFIG_RNG_NPCM) += npcm_rng.o diff --git a/drivers/rng/mpfs_rng.c b/drivers/rng/mpfs_rng.c new file mode 100644 index 00000000000..820103a0202 --- /dev/null +++ b/drivers/rng/mpfs_rng.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Microchip's PolarFire SoC (MPFS) System Controller Driver + * + * Copyright (C) 2026 Microchip Technology Inc. All rights reserved. + * + * Author: Jamie Gibbons + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define CMD_OPCODE 0x21 +#define CMD_DATA_SIZE 0U +#define CMD_DATA NULL +#define MBOX_OFFSET 0U +#define RESP_OFFSET 0U +#define RNG_RESP_BYTES 32U + +/** + * struct mpfs_rng_priv - Structure representing System Controller data. + * @mpfs_syscontroller_priv: System Controller + */ +struct mpfs_rng_priv { + struct mpfs_syscontroller_priv *sys_controller; +}; + +static int mpfs_rng_read(struct udevice *dev, void *data, size_t len) +{ + struct mpfs_rng_priv *rng_priv = dev_get_priv(dev); + u32 response_msg[RNG_RESP_BYTES / sizeof(u32)]; + size_t count = 0, copy_size; + int ret; + + struct mpfs_mss_response response = { + .resp_status = 0U, + .resp_msg = (u32 *)response_msg, + .resp_size = RNG_RESP_BYTES, + }; + struct mpfs_mss_msg msg = { + .cmd_opcode = CMD_OPCODE, + .cmd_data_size = CMD_DATA_SIZE, + .response = &response, + .cmd_data = CMD_DATA, + .mbox_offset = MBOX_OFFSET, + .resp_offset = RESP_OFFSET, + }; + + while (count < len) { + ret = mpfs_syscontroller_run_service(rng_priv->sys_controller, &msg); + if (ret) + return ret; + + ret = mpfs_syscontroller_recv_response(rng_priv->sys_controller, &msg, 1000); + if (ret) + return ret; + + copy_size = (len - count > RNG_RESP_BYTES) ? RNG_RESP_BYTES : (len - count); + memcpy((u8 *)data + count, response_msg, copy_size); + count += copy_size; + } + + return 0; +} + +static int mpfs_rng_probe(struct udevice *dev) +{ + struct mpfs_rng_priv *rng_priv = dev_get_priv(dev); + + rng_priv->sys_controller = mpfs_syscontroller_get(dev->parent); + if (IS_ERR(rng_priv->sys_controller)) { + dev_err(dev, "Failed to get system controller\n"); + return PTR_ERR(rng_priv->sys_controller); + } + + return 0; +} + +static const struct dm_rng_ops mpfs_rng_ops = { + .read = mpfs_rng_read, +}; + +U_BOOT_DRIVER(mpfs_rng) = { + .name = "mpfs_rng", + .id = UCLASS_RNG, + .probe = mpfs_rng_probe, + .priv_auto = sizeof(struct mpfs_rng_priv), + .ops = &mpfs_rng_ops, +}; -- 2.43.0