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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Layerscape SFP driver4 *5 * Copyright (c) 2022 Michael Walle <michael@walle.cc>6 *7 */8 9#include <linux/device.h>10#include <linux/io.h>11#include <linux/mod_devicetable.h>12#include <linux/module.h>13#include <linux/nvmem-provider.h>14#include <linux/platform_device.h>15#include <linux/property.h>16#include <linux/regmap.h>17 18#define LAYERSCAPE_SFP_OTP_OFFSET 0x020019 20struct layerscape_sfp_priv {21 struct regmap *regmap;22};23 24struct layerscape_sfp_data {25 int size;26 enum regmap_endian endian;27};28 29static int layerscape_sfp_read(void *context, unsigned int offset, void *val,30 size_t bytes)31{32 struct layerscape_sfp_priv *priv = context;33 34 return regmap_bulk_read(priv->regmap,35 LAYERSCAPE_SFP_OTP_OFFSET + offset, val,36 bytes / 4);37}38 39static struct nvmem_config layerscape_sfp_nvmem_config = {40 .name = "fsl-sfp",41 .reg_read = layerscape_sfp_read,42 .word_size = 4,43 .stride = 4,44};45 46static int layerscape_sfp_probe(struct platform_device *pdev)47{48 const struct layerscape_sfp_data *data;49 struct layerscape_sfp_priv *priv;50 struct nvmem_device *nvmem;51 struct regmap_config config = { 0 };52 void __iomem *base;53 54 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);55 if (!priv)56 return -ENOMEM;57 58 base = devm_platform_ioremap_resource(pdev, 0);59 if (IS_ERR(base))60 return PTR_ERR(base);61 62 data = device_get_match_data(&pdev->dev);63 config.reg_bits = 32;64 config.reg_stride = 4;65 config.val_bits = 32;66 config.val_format_endian = data->endian;67 config.max_register = LAYERSCAPE_SFP_OTP_OFFSET + data->size - 4;68 priv->regmap = devm_regmap_init_mmio(&pdev->dev, base, &config);69 if (IS_ERR(priv->regmap))70 return PTR_ERR(priv->regmap);71 72 layerscape_sfp_nvmem_config.size = data->size;73 layerscape_sfp_nvmem_config.dev = &pdev->dev;74 layerscape_sfp_nvmem_config.priv = priv;75 76 nvmem = devm_nvmem_register(&pdev->dev, &layerscape_sfp_nvmem_config);77 78 return PTR_ERR_OR_ZERO(nvmem);79}80 81static const struct layerscape_sfp_data ls1021a_data = {82 .size = 0x88,83 .endian = REGMAP_ENDIAN_BIG,84};85 86static const struct layerscape_sfp_data ls1028a_data = {87 .size = 0x88,88 .endian = REGMAP_ENDIAN_LITTLE,89};90 91static const struct of_device_id layerscape_sfp_dt_ids[] = {92 { .compatible = "fsl,ls1021a-sfp", .data = &ls1021a_data },93 { .compatible = "fsl,ls1028a-sfp", .data = &ls1028a_data },94 {},95};96MODULE_DEVICE_TABLE(of, layerscape_sfp_dt_ids);97 98static struct platform_driver layerscape_sfp_driver = {99 .probe = layerscape_sfp_probe,100 .driver = {101 .name = "layerscape_sfp",102 .of_match_table = layerscape_sfp_dt_ids,103 },104};105module_platform_driver(layerscape_sfp_driver);106 107MODULE_AUTHOR("Michael Walle <michael@walle.cc>");108MODULE_DESCRIPTION("Layerscape Security Fuse Processor driver");109MODULE_LICENSE("GPL");110