From nobody Sun Feb 8 05:40:34 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6E8293101C5 for ; Fri, 14 Nov 2025 11:06:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763118417; cv=none; b=r5MvK8DqDNQIVCevmaxAUyKyA6DbntkIK0V3bdNOUTz1OG1SN7Mh+/GXzzsgTPejmkIvuwrzLsQ4s8a4dMfZd67zzMzULTUNZBllolb4wNq81HDSfoCpazGNZu7C4TFYh6ydtWpxv5BMVSgfsgH6hWI1iSIyrGMKPy1jMr0ii6w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763118417; c=relaxed/simple; bh=SmiwaI1IjHVdq2bbxdPMGaPmELF2+waX60D7C94IQQw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ORV+oM531WjZeHCofacj44EXupFu3NI5iOMo+veoR8vH849QxB+qhdskGK74cfBfRHqdd9tzispqyCTvc9fFgHMiHQjd6uhNCBIcK0EF7kcfds9KEnW+EVKKxgAsQ2hzNlj0xjbPWnSlonglm9dAxM+SpwNJh0Xy7cSLHquGIpM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=A2T7VyqH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="A2T7VyqH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0ED13C4AF09; Fri, 14 Nov 2025 11:06:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763118417; bh=SmiwaI1IjHVdq2bbxdPMGaPmELF2+waX60D7C94IQQw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A2T7VyqHleUj68/W6cnH5RXEZPhwz2yhKlsArNecI8M2D6+ow5zB7NHub1lkZguME Pd9MaoSFzQWfiVzzAuv4HVevrZSqB+dd36g3wsawlTN1zNZsuLd0WtlQ0w+p0zwvqI evu7e9XW4ivYb3mtKFE0jDrcFXMbw8cKbp3T9xsZJYrsnQQb8AENyPkCTXsf+sX8fN UFtny0GiclwWI8xUVniCzEf8jaX3XBmCs5GT9NhGSwAxzKIoIDoIdPcxCaE1BkmTkr 3hFTeiKZQWZZHXCNZDraO2i1tAwQFN0fRcdmXWjIQxKTTrrlQMaVYCNZEDp5WW5tir chZQvU+7tJgQA== From: srini@kernel.org To: gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, Heiko Stuebner , Srinivas Kandagatla Subject: [PATCH 3/8] nvmem: Add driver for the eeprom in qnap-mcu controllers Date: Fri, 14 Nov 2025 11:06:31 +0000 Message-ID: <20251114110636.143268-4-srini@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251114110636.143268-1-srini@kernel.org> References: <20251114110636.143268-1-srini@kernel.org> 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" From: Heiko Stuebner The qnap-mcu also has an eeprom connected to it, that contains some specific product-information like the mac addresses for the network interfaces. Add a nvmem driver for it. Signed-off-by: Heiko Stuebner Acked-by: Srinivas Kandagatla Signed-off-by: Srinivas Kandagatla --- drivers/nvmem/Kconfig | 9 +++ drivers/nvmem/Makefile | 2 + drivers/nvmem/qnap-mcu-eeprom.c | 111 ++++++++++++++++++++++++++++++++ 3 files changed, 122 insertions(+) create mode 100644 drivers/nvmem/qnap-mcu-eeprom.c diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index e0d88d3199c1..bf47a982cf62 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -285,6 +285,15 @@ config NVMEM_QCOM_SEC_QFPROM This driver can also be built as a module. If so, the module wil= l be called nvmem_sec_qfprom. =20 +config NVMEM_QNAP_MCU_EEPROM + tristate "QNAP MCU EEPROM Support" + depends on MFD_QNAP_MCU + help + Say y here to enable support for accessing the EEPROM attached to + QNAP MCU devices. This EEPROM contains additional runtime device + information, like MAC addresses for ethernet devices that do not + contain their own mac storage. + config NVMEM_RAVE_SP_EEPROM tristate "Rave SP EEPROM Support" depends on RAVE_SP_CORE diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index 70a4464dcb1e..7252b8ec88d4 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -56,6 +56,8 @@ obj-$(CONFIG_NVMEM_QCOM_QFPROM) +=3D nvmem_qfprom.o nvmem_qfprom-y :=3D qfprom.o obj-$(CONFIG_NVMEM_QCOM_SEC_QFPROM) +=3D nvmem_sec_qfprom.o nvmem_sec_qfprom-y :=3D sec-qfprom.o +obj-$(CONFIG_NVMEM_QNAP_MCU_EEPROM) +=3D nvmem-qnap-mcu-eeprom.o +nvmem-qnap-mcu-eeprom-y :=3D qnap-mcu-eeprom.o obj-$(CONFIG_NVMEM_RAVE_SP_EEPROM) +=3D nvmem-rave-sp-eeprom.o nvmem-rave-sp-eeprom-y :=3D rave-sp-eeprom.o obj-$(CONFIG_NVMEM_RCAR_EFUSE) +=3D nvmem-rcar-efuse.o diff --git a/drivers/nvmem/qnap-mcu-eeprom.c b/drivers/nvmem/qnap-mcu-eepro= m.c new file mode 100644 index 000000000000..0b919895b3b2 --- /dev/null +++ b/drivers/nvmem/qnap-mcu-eeprom.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * ee1004 - driver for DDR4 SPD EEPROMs + * + * Copyright (C) 2017-2019 Jean Delvare + * + * Based on the at24 driver: + * Copyright (C) 2005-2007 David Brownell + * Copyright (C) 2008 Wolfram Sang, Pengutronix + */ + +#include +#include +#include +#include +#include + +/* Determined by trial and error until read anomalies appeared */ +#define QNAP_MCU_EEPROM_SIZE 256 +#define QNAP_MCU_EEPROM_BLOCK_SIZE 32 + +static int qnap_mcu_eeprom_read_block(struct qnap_mcu *mcu, unsigned int o= ffset, + void *val, size_t bytes) +{ + const u8 cmd[] =3D { 0xf7, 0xa1, offset, bytes }; + u8 *reply; + int ret =3D 0; + + reply =3D kzalloc(bytes + sizeof(cmd), GFP_KERNEL); + if (!reply) + return -ENOMEM; + + ret =3D qnap_mcu_exec(mcu, cmd, sizeof(cmd), reply, bytes + sizeof(cmd)); + if (ret) + goto out; + + /* First bytes must mirror the sent command */ + if (memcmp(cmd, reply, sizeof(cmd))) { + ret =3D -EIO; + goto out; + } + + memcpy(val, reply + sizeof(cmd), bytes); + +out: + kfree(reply); + return ret; +} + +static int qnap_mcu_eeprom_read(void *priv, unsigned int offset, void *val= , size_t bytes) +{ + struct qnap_mcu *mcu =3D priv; + int pos =3D 0, ret; + u8 *buf =3D val; + + if (unlikely(!bytes)) + return 0; + + while (bytes > 0) { + size_t to_read =3D (bytes > QNAP_MCU_EEPROM_BLOCK_SIZE) ? + QNAP_MCU_EEPROM_BLOCK_SIZE : bytes; + + ret =3D qnap_mcu_eeprom_read_block(mcu, offset + pos, &buf[pos], to_read= ); + if (ret < 0) + return ret; + + pos +=3D to_read; + bytes -=3D to_read; + } + + return 0; +} + +static int qnap_mcu_eeprom_probe(struct platform_device *pdev) +{ + struct qnap_mcu *mcu =3D dev_get_drvdata(pdev->dev.parent); + struct nvmem_config nvcfg =3D {}; + struct nvmem_device *ndev; + + nvcfg.dev =3D &pdev->dev; + nvcfg.of_node =3D pdev->dev.parent->of_node; + nvcfg.name =3D dev_name(&pdev->dev); + nvcfg.id =3D NVMEM_DEVID_NONE; + nvcfg.owner =3D THIS_MODULE; + nvcfg.type =3D NVMEM_TYPE_EEPROM; + nvcfg.read_only =3D true; + nvcfg.root_only =3D false; + nvcfg.reg_read =3D qnap_mcu_eeprom_read; + nvcfg.size =3D QNAP_MCU_EEPROM_SIZE, + nvcfg.word_size =3D 1, + nvcfg.stride =3D 1, + nvcfg.priv =3D mcu, + + ndev =3D devm_nvmem_register(&pdev->dev, &nvcfg); + if (IS_ERR(ndev)) + return PTR_ERR(ndev); + + return 0; +} + +static struct platform_driver qnap_mcu_eeprom_driver =3D { + .probe =3D qnap_mcu_eeprom_probe, + .driver =3D { + .name =3D "qnap-mcu-eeprom", + }, +}; +module_platform_driver(qnap_mcu_eeprom_driver); + +MODULE_AUTHOR("Heiko Stuebner "); +MODULE_DESCRIPTION("QNAP MCU EEPROM driver"); +MODULE_LICENSE("GPL"); --=20 2.51.0