169 lines
3.4 KiB
C
169 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* i.MX8 OCOTP fusebox driver
|
|
*
|
|
* Copyright 2019 NXP
|
|
*
|
|
* Peng Fan <peng.fan@nxp.com>
|
|
*/
|
|
|
|
#include <linux/firmware/imx/sci.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 ocotp_devtype {
|
|
IMX8QXP,
|
|
IMX8QM,
|
|
};
|
|
|
|
struct ocotp_devtype_data {
|
|
int devtype;
|
|
int nregs;
|
|
};
|
|
|
|
struct ocotp_priv {
|
|
struct device *dev;
|
|
const struct ocotp_devtype_data *data;
|
|
struct imx_sc_ipc *nvmem_ipc;
|
|
};
|
|
|
|
struct imx_sc_msg_misc_fuse_read {
|
|
struct imx_sc_rpc_msg hdr;
|
|
u32 word;
|
|
} __packed;
|
|
|
|
static struct ocotp_devtype_data imx8qxp_data = {
|
|
.devtype = IMX8QXP,
|
|
.nregs = 800,
|
|
};
|
|
|
|
static struct ocotp_devtype_data imx8qm_data = {
|
|
.devtype = IMX8QM,
|
|
.nregs = 800,
|
|
};
|
|
|
|
static int imx_sc_misc_otp_fuse_read(struct imx_sc_ipc *ipc, u32 word,
|
|
u32 *val)
|
|
{
|
|
struct imx_sc_msg_misc_fuse_read msg;
|
|
struct imx_sc_rpc_msg *hdr = &msg.hdr;
|
|
int ret;
|
|
|
|
hdr->ver = IMX_SC_RPC_VERSION;
|
|
hdr->svc = IMX_SC_RPC_SVC_MISC;
|
|
hdr->func = IMX_SC_MISC_FUNC_OTP_FUSE_READ;
|
|
hdr->size = 2;
|
|
|
|
msg.word = word;
|
|
|
|
ret = imx_scu_call_rpc(ipc, &msg, true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*val = msg.word;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int imx_scu_ocotp_read(void *context, unsigned int offset,
|
|
void *val, size_t bytes)
|
|
{
|
|
struct ocotp_priv *priv = context;
|
|
u32 count, index, num_bytes;
|
|
u32 *buf;
|
|
void *p;
|
|
int i, ret;
|
|
|
|
index = offset >> 2;
|
|
num_bytes = round_up((offset % 4) + bytes, 4);
|
|
count = num_bytes >> 2;
|
|
|
|
if (count > (priv->data->nregs - index))
|
|
count = priv->data->nregs - index;
|
|
|
|
p = kzalloc(num_bytes, GFP_KERNEL);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
buf = p;
|
|
|
|
for (i = index; i < (index + count); i++) {
|
|
if (priv->data->devtype == IMX8QXP) {
|
|
if ((i > 271) && (i < 544)) {
|
|
*buf++ = 0;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
ret = imx_sc_misc_otp_fuse_read(priv->nvmem_ipc, i, buf);
|
|
if (ret) {
|
|
kfree(p);
|
|
return ret;
|
|
}
|
|
buf++;
|
|
}
|
|
|
|
memcpy(val, (u8 *)p + offset % 4, bytes);
|
|
|
|
kfree(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct nvmem_config imx_scu_ocotp_nvmem_config = {
|
|
.name = "imx-scu-ocotp",
|
|
.read_only = true,
|
|
.word_size = 4,
|
|
.stride = 1,
|
|
.owner = THIS_MODULE,
|
|
.reg_read = imx_scu_ocotp_read,
|
|
};
|
|
|
|
static const struct of_device_id imx_scu_ocotp_dt_ids[] = {
|
|
{ .compatible = "fsl,imx8qxp-scu-ocotp", (void *)&imx8qxp_data },
|
|
{ .compatible = "fsl,imx8qm-scu-ocotp", (void *)&imx8qm_data },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, imx_scu_ocotp_dt_ids);
|
|
|
|
static int imx_scu_ocotp_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct ocotp_priv *priv;
|
|
struct nvmem_device *nvmem;
|
|
int ret;
|
|
|
|
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
ret = imx_scu_get_handle(&priv->nvmem_ipc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
priv->data = of_device_get_match_data(dev);
|
|
priv->dev = dev;
|
|
imx_scu_ocotp_nvmem_config.size = 4 * priv->data->nregs;
|
|
imx_scu_ocotp_nvmem_config.dev = dev;
|
|
imx_scu_ocotp_nvmem_config.priv = priv;
|
|
nvmem = devm_nvmem_register(dev, &imx_scu_ocotp_nvmem_config);
|
|
|
|
return PTR_ERR_OR_ZERO(nvmem);
|
|
}
|
|
|
|
static struct platform_driver imx_scu_ocotp_driver = {
|
|
.probe = imx_scu_ocotp_probe,
|
|
.driver = {
|
|
.name = "imx_scu_ocotp",
|
|
.of_match_table = imx_scu_ocotp_dt_ids,
|
|
},
|
|
};
|
|
module_platform_driver(imx_scu_ocotp_driver);
|
|
|
|
MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
|
|
MODULE_DESCRIPTION("i.MX8 SCU OCOTP fuse box driver");
|
|
MODULE_LICENSE("GPL v2");
|