110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Layerscape SFP driver
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*
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* Copyright (c) 2022 Michael Walle <michael@walle.cc>
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*
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*/
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/mod_devicetable.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/property.h>
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#include <linux/regmap.h>
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#define LAYERSCAPE_SFP_OTP_OFFSET 0x0200
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struct layerscape_sfp_priv {
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struct regmap *regmap;
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};
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struct layerscape_sfp_data {
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int size;
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enum regmap_endian endian;
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};
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static int layerscape_sfp_read(void *context, unsigned int offset, void *val,
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size_t bytes)
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{
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struct layerscape_sfp_priv *priv = context;
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return regmap_bulk_read(priv->regmap,
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LAYERSCAPE_SFP_OTP_OFFSET + offset, val,
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bytes / 4);
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}
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static struct nvmem_config layerscape_sfp_nvmem_config = {
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.name = "fsl-sfp",
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.reg_read = layerscape_sfp_read,
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.word_size = 4,
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.stride = 4,
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};
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static int layerscape_sfp_probe(struct platform_device *pdev)
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{
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const struct layerscape_sfp_data *data;
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struct layerscape_sfp_priv *priv;
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struct nvmem_device *nvmem;
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struct regmap_config config = { 0 };
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void __iomem *base;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(base))
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return PTR_ERR(base);
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data = device_get_match_data(&pdev->dev);
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config.reg_bits = 32;
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config.reg_stride = 4;
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config.val_bits = 32;
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config.val_format_endian = data->endian;
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config.max_register = LAYERSCAPE_SFP_OTP_OFFSET + data->size - 4;
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priv->regmap = devm_regmap_init_mmio(&pdev->dev, base, &config);
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if (IS_ERR(priv->regmap))
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return PTR_ERR(priv->regmap);
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layerscape_sfp_nvmem_config.size = data->size;
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layerscape_sfp_nvmem_config.dev = &pdev->dev;
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layerscape_sfp_nvmem_config.priv = priv;
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nvmem = devm_nvmem_register(&pdev->dev, &layerscape_sfp_nvmem_config);
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return PTR_ERR_OR_ZERO(nvmem);
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}
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static const struct layerscape_sfp_data ls1021a_data = {
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.size = 0x88,
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.endian = REGMAP_ENDIAN_BIG,
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};
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static const struct layerscape_sfp_data ls1028a_data = {
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.size = 0x88,
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.endian = REGMAP_ENDIAN_LITTLE,
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};
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static const struct of_device_id layerscape_sfp_dt_ids[] = {
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{ .compatible = "fsl,ls1021a-sfp", .data = &ls1021a_data },
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{ .compatible = "fsl,ls1028a-sfp", .data = &ls1028a_data },
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{},
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};
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MODULE_DEVICE_TABLE(of, layerscape_sfp_dt_ids);
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static struct platform_driver layerscape_sfp_driver = {
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.probe = layerscape_sfp_probe,
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.driver = {
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.name = "layerscape_sfp",
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.of_match_table = layerscape_sfp_dt_ids,
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},
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};
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module_platform_driver(layerscape_sfp_driver);
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MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
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MODULE_DESCRIPTION("Layerscape Security Fuse Processor driver");
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MODULE_LICENSE("GPL");
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