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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * i.MX9 OCOTP fusebox driver4 *5 * Copyright 2023 NXP6 */7 8#include <linux/device.h>9#include <linux/io.h>10#include <linux/module.h>11#include <linux/nvmem-provider.h>12#include <linux/of.h>13#include <linux/platform_device.h>14#include <linux/slab.h>15 16enum fuse_type {17 FUSE_FSB = BIT(0),18 FUSE_ELE = BIT(1),19 FUSE_ECC = BIT(2),20 FUSE_INVALID = -121};22 23struct ocotp_map_entry {24 u32 start; /* start word */25 u32 num; /* num words */26 enum fuse_type type;27};28 29struct ocotp_devtype_data {30 u32 reg_off;31 char *name;32 u32 size;33 u32 num_entry;34 u32 flag;35 nvmem_reg_read_t reg_read;36 struct ocotp_map_entry entry[];37};38 39struct imx_ocotp_priv {40 struct device *dev;41 void __iomem *base;42 struct nvmem_config config;43 struct mutex lock;44 const struct ocotp_devtype_data *data;45};46 47static enum fuse_type imx_ocotp_fuse_type(void *context, u32 index)48{49 struct imx_ocotp_priv *priv = context;50 const struct ocotp_devtype_data *data = priv->data;51 u32 start, end;52 int i;53 54 for (i = 0; i < data->num_entry; i++) {55 start = data->entry[i].start;56 end = data->entry[i].start + data->entry[i].num;57 58 if (index >= start && index < end)59 return data->entry[i].type;60 }61 62 return FUSE_INVALID;63}64 65static int imx_ocotp_reg_read(void *context, unsigned int offset, void *val, size_t bytes)66{67 struct imx_ocotp_priv *priv = context;68 void __iomem *reg = priv->base + priv->data->reg_off;69 u32 count, index, num_bytes;70 enum fuse_type type;71 u32 *buf;72 void *p;73 int i;74 75 index = offset;76 num_bytes = round_up(bytes, 4);77 count = num_bytes >> 2;78 79 if (count > ((priv->data->size >> 2) - index))80 count = (priv->data->size >> 2) - index;81 82 p = kzalloc(num_bytes, GFP_KERNEL);83 if (!p)84 return -ENOMEM;85 86 mutex_lock(&priv->lock);87 88 buf = p;89 90 for (i = index; i < (index + count); i++) {91 type = imx_ocotp_fuse_type(context, i);92 if (type == FUSE_INVALID || type == FUSE_ELE) {93 *buf++ = 0;94 continue;95 }96 97 if (type & FUSE_ECC)98 *buf++ = readl_relaxed(reg + (i << 2)) & GENMASK(15, 0);99 else100 *buf++ = readl_relaxed(reg + (i << 2));101 }102 103 memcpy(val, (u8 *)p, bytes);104 105 mutex_unlock(&priv->lock);106 107 kfree(p);108 109 return 0;110};111 112static int imx_ele_ocotp_probe(struct platform_device *pdev)113{114 struct device *dev = &pdev->dev;115 struct imx_ocotp_priv *priv;116 struct nvmem_device *nvmem;117 118 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);119 if (!priv)120 return -ENOMEM;121 122 priv->data = of_device_get_match_data(dev);123 124 priv->base = devm_platform_ioremap_resource(pdev, 0);125 if (IS_ERR(priv->base))126 return PTR_ERR(priv->base);127 128 priv->config.dev = dev;129 priv->config.name = "ELE-OCOTP";130 priv->config.id = NVMEM_DEVID_AUTO;131 priv->config.owner = THIS_MODULE;132 priv->config.size = priv->data->size;133 priv->config.reg_read = priv->data->reg_read;134 priv->config.word_size = 4;135 priv->config.stride = 1;136 priv->config.priv = priv;137 priv->config.read_only = true;138 mutex_init(&priv->lock);139 140 nvmem = devm_nvmem_register(dev, &priv->config);141 if (IS_ERR(nvmem))142 return PTR_ERR(nvmem);143 144 return 0;145}146 147static const struct ocotp_devtype_data imx93_ocotp_data = {148 .reg_off = 0x8000,149 .reg_read = imx_ocotp_reg_read,150 .size = 2048,151 .num_entry = 6,152 .entry = {153 { 0, 52, FUSE_FSB },154 { 63, 1, FUSE_ELE},155 { 128, 16, FUSE_ELE },156 { 182, 1, FUSE_ELE },157 { 188, 1, FUSE_ELE },158 { 312, 200, FUSE_FSB }159 },160};161 162static const struct ocotp_devtype_data imx95_ocotp_data = {163 .reg_off = 0x8000,164 .reg_read = imx_ocotp_reg_read,165 .size = 2048,166 .num_entry = 12,167 .entry = {168 { 0, 1, FUSE_FSB | FUSE_ECC },169 { 7, 1, FUSE_FSB | FUSE_ECC },170 { 9, 3, FUSE_FSB | FUSE_ECC },171 { 12, 24, FUSE_FSB },172 { 36, 2, FUSE_FSB | FUSE_ECC },173 { 38, 14, FUSE_FSB },174 { 63, 1, FUSE_ELE },175 { 128, 16, FUSE_ELE },176 { 188, 1, FUSE_ELE },177 { 317, 2, FUSE_FSB | FUSE_ECC },178 { 320, 7, FUSE_FSB },179 { 328, 184, FUSE_FSB }180 },181};182 183static const struct of_device_id imx_ele_ocotp_dt_ids[] = {184 { .compatible = "fsl,imx93-ocotp", .data = &imx93_ocotp_data, },185 { .compatible = "fsl,imx95-ocotp", .data = &imx95_ocotp_data, },186 {},187};188MODULE_DEVICE_TABLE(of, imx_ele_ocotp_dt_ids);189 190static struct platform_driver imx_ele_ocotp_driver = {191 .driver = {192 .name = "imx_ele_ocotp",193 .of_match_table = imx_ele_ocotp_dt_ids,194 },195 .probe = imx_ele_ocotp_probe,196};197module_platform_driver(imx_ele_ocotp_driver);198 199MODULE_DESCRIPTION("i.MX OCOTP/ELE driver");200MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");201MODULE_LICENSE("GPL");202