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// SPDX-License-Identifier: GPL-2.0-only
/*
* i.MX9 OCOTP fusebox driver
*
* Copyright 2023 NXP
*/
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
enum fuse_type {
FUSE_FSB = 1,
FUSE_ELE = 2,
FUSE_INVALID = -1
};
struct ocotp_map_entry {
u32 start; /* start word */
u32 num; /* num words */
enum fuse_type type;
};
struct ocotp_devtype_data {
u32 reg_off;
char *name;
u32 size;
u32 num_entry;
u32 flag;
nvmem_reg_read_t reg_read;
struct ocotp_map_entry entry[];
};
struct imx_ocotp_priv {
struct device *dev;
void __iomem *base;
struct nvmem_config config;
struct mutex lock;
const struct ocotp_devtype_data *data;
};
static enum fuse_type imx_ocotp_fuse_type(void *context, u32 index)
{
struct imx_ocotp_priv *priv = context;
const struct ocotp_devtype_data *data = priv->data;
u32 start, end;
int i;
for (i = 0; i < data->num_entry; i++) {
start = data->entry[i].start;
end = data->entry[i].start + data->entry[i].num;
if (index >= start && index < end)
return data->entry[i].type;
}
return FUSE_INVALID;
}
static int imx_ocotp_reg_read(void *context, unsigned int offset, void *val, size_t bytes)
{
struct imx_ocotp_priv *priv = context;
void __iomem *reg = priv->base + priv->data->reg_off;
u32 count, index, num_bytes;
enum fuse_type type;
u32 *buf;
void *p;
int i;
index = offset;
num_bytes = round_up(bytes, 4);
count = num_bytes >> 2;
if (count > ((priv->data->size >> 2) - index))
count = (priv->data->size >> 2) - index;
p = kzalloc(num_bytes, GFP_KERNEL);
if (!p)
return -ENOMEM;
mutex_lock(&priv->lock);
buf = p;
for (i = index; i < (index + count); i++) {
type = imx_ocotp_fuse_type(context, i);
if (type == FUSE_INVALID || type == FUSE_ELE) {
*buf++ = 0;
continue;
}
*buf++ = readl_relaxed(reg + (i << 2));
}
memcpy(val, (u8 *)p, bytes);
mutex_unlock(&priv->lock);
kfree(p);
return 0;
};
static int imx_ele_ocotp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct imx_ocotp_priv *priv;
struct nvmem_device *nvmem;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->data = of_device_get_match_data(dev);
priv->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
priv->config.dev = dev;
priv->config.name = "ELE-OCOTP";
priv->config.id = NVMEM_DEVID_AUTO;
priv->config.owner = THIS_MODULE;
priv->config.size = priv->data->size;
priv->config.reg_read = priv->data->reg_read;
priv->config.word_size = 4;
priv->config.stride = 1;
priv->config.priv = priv;
priv->config.read_only = true;
mutex_init(&priv->lock);
nvmem = devm_nvmem_register(dev, &priv->config);
if (IS_ERR(nvmem))
return PTR_ERR(nvmem);
return 0;
}
static const struct ocotp_devtype_data imx93_ocotp_data = {
.reg_off = 0x8000,
.reg_read = imx_ocotp_reg_read,
.size = 2048,
.num_entry = 6,
.entry = {
{ 0, 52, FUSE_FSB },
{ 63, 1, FUSE_ELE},
{ 128, 16, FUSE_ELE },
{ 182, 1, FUSE_ELE },
{ 188, 1, FUSE_ELE },
{ 312, 200, FUSE_FSB }
},
};
static const struct of_device_id imx_ele_ocotp_dt_ids[] = {
{ .compatible = "fsl,imx93-ocotp", .data = &imx93_ocotp_data, },
{},
};
MODULE_DEVICE_TABLE(of, imx_ele_ocotp_dt_ids);
static struct platform_driver imx_ele_ocotp_driver = {
.driver = {
.name = "imx_ele_ocotp",
.of_match_table = imx_ele_ocotp_dt_ids,
},
.probe = imx_ele_ocotp_probe,
};
module_platform_driver(imx_ele_ocotp_driver);
MODULE_DESCRIPTION("i.MX OCOTP/ELE driver");
MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
MODULE_LICENSE("GPL");
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