From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/nvmem/imx-ocotp-ele.c | 175 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 175 insertions(+) create mode 100644 drivers/nvmem/imx-ocotp-ele.c (limited to 'drivers/nvmem/imx-ocotp-ele.c') diff --git a/drivers/nvmem/imx-ocotp-ele.c b/drivers/nvmem/imx-ocotp-ele.c new file mode 100644 index 000000000..cf920542f --- /dev/null +++ b/drivers/nvmem/imx-ocotp-ele.c @@ -0,0 +1,175 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * i.MX9 OCOTP fusebox driver + * + * Copyright 2023 NXP + */ + +#include +#include +#include +#include +#include +#include +#include + +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 "); +MODULE_LICENSE("GPL"); -- cgit v1.2.3