--- /dev/null
+From 22e9e6fcfb5042cb6d6c7874c459b034800092f1 Mon Sep 17 00:00:00 2001
+From: Peng Fan <peng.fan@nxp.com>
+Date: Sun, 11 Jun 2023 15:03:25 +0100
+Subject: [PATCH] nvmem: imx: support i.MX93 OCOTP
+
+Add i.MX93 OCOTP support. i.MX93 OCOTP has two parts: Fuse shadow
+block(fsb) and fuse managed by ELE. The FSB part could be directly
+accessed with MMIO, the ELE could only be accessed with ELE API.
+
+Currently the ELE API is not ready, so NULL function callback is used,
+but it was tested with downstream ELE API.
+
+Signed-off-by: Peng Fan <peng.fan@nxp.com>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+Message-ID: <20230611140330.154222-22-srinivas.kandagatla@linaro.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/nvmem/Kconfig | 9 ++
+ drivers/nvmem/Makefile | 2 +
+ drivers/nvmem/imx-ocotp-ele.c | 175 ++++++++++++++++++++++++++++++++++
+ 3 files changed, 186 insertions(+)
+ create mode 100644 drivers/nvmem/imx-ocotp-ele.c
+
+--- a/drivers/nvmem/Kconfig
++++ b/drivers/nvmem/Kconfig
+@@ -83,6 +83,15 @@ config NVMEM_IMX_OCOTP
+ This driver can also be built as a module. If so, the module
+ will be called nvmem-imx-ocotp.
+
++config NVMEM_IMX_OCOTP_ELE
++ tristate "i.MX On-Chip OTP Controller support"
++ depends on ARCH_MXC || COMPILE_TEST
++ depends on HAS_IOMEM
++ depends on OF
++ help
++ This is a driver for the On-Chip OTP Controller (OCOTP)
++ available on i.MX SoCs which has ELE.
++
+ config NVMEM_IMX_OCOTP_SCU
+ tristate "i.MX8 SCU On-Chip OTP Controller support"
+ depends on IMX_SCU
+--- a/drivers/nvmem/Makefile
++++ b/drivers/nvmem/Makefile
+@@ -18,6 +18,8 @@ obj-$(CONFIG_NVMEM_IMX_IIM) += nvmem-im
+ nvmem-imx-iim-y := imx-iim.o
+ obj-$(CONFIG_NVMEM_IMX_OCOTP) += nvmem-imx-ocotp.o
+ nvmem-imx-ocotp-y := imx-ocotp.o
++obj-$(CONFIG_NVMEM_IMX_OCOTP_ELE) += nvmem-imx-ocotp-ele.o
++nvmem-imx-ocotp-ele-y := imx-ocotp-ele.o
+ obj-$(CONFIG_NVMEM_IMX_OCOTP_SCU) += nvmem-imx-ocotp-scu.o
+ nvmem-imx-ocotp-scu-y := imx-ocotp-scu.o
+ obj-$(CONFIG_NVMEM_JZ4780_EFUSE) += nvmem_jz4780_efuse.o
+--- /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 <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");
projects / openwrt / staging / hauke.git / blobdiff