Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
nvmem: Add driver for the eeprom in qnap-mcu controllers
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 <heiko@sntech.de>
Acked-by: Srinivas Kandagatla <srini@kernel.org>
Signed-off-by: Srinivas Kandagatla <srini@kernel.org>
Link: https://patch.msgid.link/20251114110636.143268-4-srini@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
authored by
Heiko Stuebner
and committed by
Greg Kroah-Hartman
2f9fae50
47b7ea65
+122
+9
drivers/nvmem/Kconfig
+9
drivers/nvmem/Kconfig
···
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This driver can also be built as a module. If so, the module will be called
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nvmem_sec_qfprom.
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config NVMEM_QNAP_MCU_EEPROM
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tristate "QNAP MCU EEPROM Support"
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depends on MFD_QNAP_MCU
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help
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Say y here to enable support for accessing the EEPROM attached to
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QNAP MCU devices. This EEPROM contains additional runtime device
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information, like MAC addresses for ethernet devices that do not
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contain their own mac storage.
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config NVMEM_RAVE_SP_EEPROM
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tristate "Rave SP EEPROM Support"
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depends on RAVE_SP_CORE
+2
drivers/nvmem/Makefile
+2
drivers/nvmem/Makefile
···
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nvmem_qfprom-y := qfprom.o
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obj-$(CONFIG_NVMEM_QCOM_SEC_QFPROM) += nvmem_sec_qfprom.o
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nvmem_sec_qfprom-y := sec-qfprom.o
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obj-$(CONFIG_NVMEM_QNAP_MCU_EEPROM) += nvmem-qnap-mcu-eeprom.o
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nvmem-qnap-mcu-eeprom-y := qnap-mcu-eeprom.o
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obj-$(CONFIG_NVMEM_RAVE_SP_EEPROM) += nvmem-rave-sp-eeprom.o
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nvmem-rave-sp-eeprom-y := rave-sp-eeprom.o
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obj-$(CONFIG_NVMEM_RCAR_EFUSE) += nvmem-rcar-efuse.o
+111
drivers/nvmem/qnap-mcu-eeprom.c
+111
drivers/nvmem/qnap-mcu-eeprom.c
···
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ee1004 - driver for DDR4 SPD EEPROMs
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*
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* Copyright (C) 2017-2019 Jean Delvare
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*
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* Based on the at24 driver:
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* Copyright (C) 2005-2007 David Brownell
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* Copyright (C) 2008 Wolfram Sang, Pengutronix
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*/
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#include <linux/mfd/qnap-mcu.h>
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#include <linux/module.h>
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#include <linux/nvmem-provider.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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/* Determined by trial and error until read anomalies appeared */
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#define QNAP_MCU_EEPROM_SIZE 256
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#define QNAP_MCU_EEPROM_BLOCK_SIZE 32
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static int qnap_mcu_eeprom_read_block(struct qnap_mcu *mcu, unsigned int offset,
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void *val, size_t bytes)
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{
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const u8 cmd[] = { 0xf7, 0xa1, offset, bytes };
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u8 *reply;
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int ret = 0;
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reply = kzalloc(bytes + sizeof(cmd), GFP_KERNEL);
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if (!reply)
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return -ENOMEM;
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ret = qnap_mcu_exec(mcu, cmd, sizeof(cmd), reply, bytes + sizeof(cmd));
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if (ret)
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goto out;
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/* First bytes must mirror the sent command */
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if (memcmp(cmd, reply, sizeof(cmd))) {
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ret = -EIO;
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goto out;
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}
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memcpy(val, reply + sizeof(cmd), bytes);
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out:
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kfree(reply);
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return ret;
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}
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static int qnap_mcu_eeprom_read(void *priv, unsigned int offset, void *val, size_t bytes)
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{
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struct qnap_mcu *mcu = priv;
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int pos = 0, ret;
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u8 *buf = val;
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if (unlikely(!bytes))
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return 0;
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while (bytes > 0) {
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size_t to_read = (bytes > QNAP_MCU_EEPROM_BLOCK_SIZE) ?
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QNAP_MCU_EEPROM_BLOCK_SIZE : bytes;
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ret = qnap_mcu_eeprom_read_block(mcu, offset + pos, &buf[pos], to_read);
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if (ret < 0)
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return ret;
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pos += to_read;
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bytes -= to_read;
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}
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return 0;
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}
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static int qnap_mcu_eeprom_probe(struct platform_device *pdev)
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{
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struct qnap_mcu *mcu = dev_get_drvdata(pdev->dev.parent);
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struct nvmem_config nvcfg = {};
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struct nvmem_device *ndev;
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nvcfg.dev = &pdev->dev;
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nvcfg.of_node = pdev->dev.parent->of_node;
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nvcfg.name = dev_name(&pdev->dev);
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nvcfg.id = NVMEM_DEVID_NONE;
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nvcfg.owner = THIS_MODULE;
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nvcfg.type = NVMEM_TYPE_EEPROM;
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nvcfg.read_only = true;
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nvcfg.root_only = false;
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nvcfg.reg_read = qnap_mcu_eeprom_read;
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nvcfg.size = QNAP_MCU_EEPROM_SIZE,
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nvcfg.word_size = 1,
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nvcfg.stride = 1,
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nvcfg.priv = mcu,
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ndev = devm_nvmem_register(&pdev->dev, &nvcfg);
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if (IS_ERR(ndev))
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return PTR_ERR(ndev);
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return 0;
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}
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static struct platform_driver qnap_mcu_eeprom_driver = {
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.probe = qnap_mcu_eeprom_probe,
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.driver = {
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.name = "qnap-mcu-eeprom",
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},
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};
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module_platform_driver(qnap_mcu_eeprom_driver);
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MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
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MODULE_DESCRIPTION("QNAP MCU EEPROM driver");
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MODULE_LICENSE("GPL");