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